CRACK TREATMENT OF THE ASPHALT BINDER COURSE

Main Break Water(MBW) access road occurs several cracks on the asphalt binder course. The road cracks are monitored and investigated with specialist from RDA Research & Development. This report describes the reason and remedial method of the cracks based on the investigation and consultation.

MBW access road structure consists of fallowing cross section and the core samples have been taken on the cracks.

According to core sample data, can be observed that the crack was started from CBM and reflected to the binder course surface.

CRACK INVESTIGATIONThe crack survey carried out for the entire road and investigation detail summarized as an attached sheet. Core samples were taken from the jointly selected locations with the engineer. MBW access road cracks were categorized into two types based on crack surface appearance.

Transverse cracks

Longitudinal cracks

Transverse cracksTransverse cracks were occurred as a perpendicular to the road center line. These cracks are reflecting from the CBM layers.

According to core sample data, can be identified the fallowing crack types was happened.

Some of cracks were occurred from CBM 2stlayer and reflected to the binder course surface.

Other cracks are started from CBM bottom layer (1stlayer) and reflected to the binder course.

Longitudinal cracksLongitudinal cracks were occurred as a parallel to the road centerline and which was happened due to the reflection of the CBM longitudinal joint.

PROPOSAL FOR REPAIR OF CRACKProposal of the crack repairing method is introduced by specialist from RDA Research & Development.

Three conditions for reflection cracks on CBM :

Cracks in the base layer must be wide enough to generate stress conditions in the asphalt surface.

There is no method available to relieve the stress concentrations.

The asphalt is brittle enough to crack due to upwards propagation of the stress concentration.

In most cases, reflection cracks are narrow (less than 3mm) and will not adversely affect the performance of the pavement. But all the cracks on MBW access road will be treated to prevent from the possibility of propagation.

As per the specialists proposal, Geo-Fabric material will be applied along the cracks of the binder course before laying the wearing course in accordance with manufacturers instructions.

CRACK REPAIRINGProposedMaterial Polyfelt (PGM-G 50/50) to be used, material details is in Appendix

Manpower Supervisor

Skilled Labours

Unskilled Labours

Sequence

MethodologyIdentify the crack locations and properly cleaning by air compressor.

Bring the notification to the site representative of the Engineer.

The binder surface is thoroughly cleaned and free from all the traces of dust and any of unsound materials.

Cut the Ploy paving Fabric (PGM 50/50) for required length of the crack and 0.5m offset from the crack as following the sketch.

Apply the tack coat on the dry surface of the binder course. More details are attached the appendix document.

Install the Polyfelt PGM 50/50 and tensioning of the paving fabrics to preventWRINKLES.

Immediately after PGM installation and apply the second tack coat for asphalt wearing course.

Laying the asphalt wearing course.

Construction of Bridge

The major materials used for the construction of bridge, but are not limited to the following.

Cement

Sand

Aggregate

Water

Reinforcements

Fly wood sheets

Embankment Filling Materials (Type 1 or Type 2)

Sub-base Materials

Rock Fill

Gunny Bags

Concrete

Guard rails

Guard posts

Kerbs

Paving slabs

EquipmentThe major equipment used for the construction of the Bridge includes, but are not limited to the following.

JCB, and/or Backhoes, and/or Excavator

Dump Trucks

Tractor & Trailer

1.2 tone vibratory rollers

Rammers / Plate Compactors

Poker Vibrators

Truck mixtures

Sampling & Testing Equipment

Total Station & Auto Level

Truck Crane

Generator

Compressor

Other minor tools

Safety Management and ControlSafety precaution will be taken complying with the Road Work Traffic Control Manual.

Method and Procedures After demolition and removing the existing bridge and repositioning the existing services as agreed with the Engineer, setting out will be carried out with the help of the survey data provided in the approved working drawings using total station. Engineer will be requested to inspect & approve the setting out.

Excavation will be started up to required level as per drawings or directed by the Engineer while providing path to flow water of the existing stream. and the preparing the surface.

Screed concrete will be done after preparing the bed. Form works & re bar fixing will be done for all wing wall bases.

After getting approval for re-bar fixing & form works, base concreting will be done.

Form works for wing wall will be done up to 150 mm level and wall concreting will be carried out.

A rock fill layer will be laid up to required level noted on the construction drawings or directed by the Engineer at the bottom of the box base and the layer will be compacted using 1.2 tone rollers. The bed surface under the bottom of the box will be well prepared and the Engineer will be requested to inspect & approve.

After getting approval for the bed surface, bottom screed concrete will be laid and the slope of the bed surface down to the existing stream will be maintained according to the Engineers instruction.

Form-works, re-bar fixing for box bottom slab and concreting will be carried out accordingly, after having the Engineers approval for concreting.

Concreting of walls will be done in two steps, the first step is form-work, re-bar fixing & concreting will be done up to half of the total height of the wall, and the remaining will be in the second step. In the second step, the finish level of the wall will be 100 mm down from the box top slab bottom level.

Form-works, re-bar fixing & concreting will be done as per the drawing issued by the Engineer.

After finishing the top slab, concreting of wing wall will be carried out. Form-works for wall will be done in three steps providing weep holes as directed by the Engineer or minimum of 1500 mm spacing.

Stone lining with 50 ~ 200 graded rock will be done before starting backfilling.

1.13 After completing the back filling, concreting of end pilaster & fixing of hand rails will be done. Then after all miscellaneous works will be started and complete construction of the Bridge.

Quality ControlTo ensure that the steps of the procedure are fully complied with the activities such as setting out, excavation, formwork, re-bar fixing, concreting, backfilling etc. certain inspections and verifications will be carried out as described in the above procedures.

Measurement ControlCement concrete shall be measured in cubic meters of each class of concrete placed and excepted and shall confirmed to quantities given in drawings except for amendments approved by the Engineer.

The quantities of reinforcing steel and other items shown in the contract documents which are included in the completed and accepted structures shall be measured for payments as separate items involved unless otherwise specified.

METHOD OF INTERNAL & EXTERNAL PLASTERING ON BRICK WALLS & CONCRETE SURFACESMethod of Plastering. Internal plastering on surfaces of brick and concrete.

External wall plastering.

Soffit plastering / Soffit finishing with cement based easy plaster material and wall putty.

Improving joint of brick walls & structural concrete joints.

Internal Plastering on surfaces of Brick and Concrete. Surface where plastering is to be done will be cleaned.

Level pegs on walls will be fixed with reference to the off lines to brick walls set out in floors. (Using centre plumb bob and nylon thread).

All the brick walls will be watered before pasting mortar on walls.

First coat mortar filling (1:4 Cement and Sand) upto 15 mm will be applied on surfaces where required mortar thickness exceed 25mm.

Walls and columns will be plastered 1:4 Cement and Sand to achieve semi rough finished surface.

Vertical joint of structural columns / walls & brick walls will be treated by fixing 200mm width chicken mesh with wire nails / concrete nails by centering the mesh to the vertical wall joint.

All the embedded service lines and provisions (Conduits, Boxes and etc. ) will be completed on brick walls and check with the MEP drawings.

Joints between walls and beams will be formed up to a maximum of 20mm and will be sealed using 30 minutes fire rated flexible filler. (Material descriptions will be submitted for the approval of the Engineer)

Internal plastering on surfaces of concrete columns, beams & walls which are aligned with surfaces of brick walls will be plastered and other concrete surfaces will be finished with cement base easy plaster. (Material descriptions will be submitted for the approval of the Engineer).

External Wall Plastering. Alignment and fixing level pegs on external wall surfaces will be done using the surveying instrument / centre plumb bobs.

Projections on the wall surfaces will be chipped off and cleaned after completing the level pegs on walls.

First coat mortar filling (1:4 Cement and Sand) upto 15 mm will be applied on surfaces where required mortar thickness exceed 25mm.

Cement paste on concrete surfaces will be applied to improve the bonding of plaster to the concrete surfaces.

Maximum width of 20mm horizontal grooves between walls and beams will be formed by cutting using grinders with diamond wheels after plastering the wall surface. This groove will be filled with approved weather sealant.

External wall plaster will be finished with rough surface.

1:10 slope at the external side of the window sill will be formed while plastering the window reveals.

Soffit Plastering / Soffit Finishing with Cement Based Easy PlasterThe slab soffits and beams' sides and soffits which are to be smooth surfaced painted finished will be smoothen with easy plaster (Material literature will be submitted separately) and places where concrete surfaces are uneven, will be roughen & leveled with cement and sand mortar plaster before applying easy plaster to make surface smooth.

Improving Joints of Brick Wall & Structural Concrete 200mm wide Chicken Mesh will be fixed at the joint.

Concrete surfaces will be washed and cleaned.

Concrete surface which are to be plastered will be roughen or put spot cement slurry.

Quality Controlling & Quality Assurance Experienced supervisory staff will be employed for carrying out the work.

Selected masons will be engaged for plastering work.

Vertical and alignment of walls will be checked while plastering.

Mixing of mortar will be done under the supervision of foremen.

Sieved sand will be used for plaster.

SafetyWorking platforms with hand rails and cat walk ladders will be fixed to access and work at higher levels.Workers will will be provided safety helmets.Safety belts will be provided for all employees who work at higher level plat forms.METHOD OF EXCAVATIONEXECUTION OF WORK Demarcate the excavation line with working space.

Shall obtain the written approval from employee to start excavation work.

Shall thoroughly explain necessary details to excavator operators to get a smooth

Work done and avoid less or over excavation.

engineer shall continuously monitor the levels while going on the excavation

SEQUENCE OF WORKRemoval of surface soil and debris are carried out and clean the site. Considering the area and volume to be excavated and the different levels of excavations in ground Reservoir excavation work shall carried out in two or three places simultaneously.

In the Ground Reservoir , excavation work shall reach up to the required level in one time.

In the Back Wash Recovery Tank excavation work shall reach up to about 3.0m level in

First phase and in 2ndphase shall reach up to final required level.

Transporting soil Excavated soil will be transported out from the site and soil suitable for back filling shall

Be stocked at adjoining land to the site. All the vehicle sending out from the site are

Recorded and daily report will be submitted to the employee. Excavation work will

Continue in night time too.

EQUIPMENT, MACHINERY AND VEHICLESThe following vehicles and machineries are available foe the excavation works. These

Will be employed time to time as necessity arises.

1. Excavator 0.7 m3- 2nos

2. 14.15m3Dump Truck - 2nos.

3. Loader Backhoe - 1 nos

4. Baby Dumper - 2 nos.

5. 9.00m3 Dump Truck 2 nos

SAFETY AND QUALITY ASSURANCEThe following measures will be taken to ensure the safety and security of machinery, Vehicle and personal.

a) All machinery will be operated by well trained operators. Operator assistants will be employed for machineries like crane, backhoe, backhoe loader, etc.

b) Only vehicles having valid revenue licenses and necessary insurance coverage will be used for transport of soil. Only drivers having valid driving license will be permitted for this work. The driver will be assisted by a helper in each heavy vehicle.

c) Proper access will be provided with suitable slopes

d) Necessary barricades will be fixed either with fence or with barricade tapes where necessary to assure the safety of the persons, vehicles and machineries.

e) The whole activity covered by a C.A.R. Policy

f) Continues watchmen will be provided for excavation and machinery movements.

SECURITY OF WORKa) All entry / exit records will be maintained at site and will be forwarded to the Engineer if requested

b) Identify details of all employees of works including operators, operator assistance, drivers, and driver helpers will be maintained under custody of Administrative Manager.

c) Gate pass will be issued with necessary approval before exit of each vehicle.

HEALTH AND EVIRONMENTAL PRECAUTIONSa) Excess soil will be dumped to filling lands after obtaining permission from all relevant government authorities.

.b) Drum Truck leaving the site with soil will be covered by polythene cover.

METHOD OF BRICK MASONRY WORKMethod StatementThis method statement will be established for the construction of brick masonry walls and the related work which are to be completed with brick walls. Brick masonry walls in the scope of work are 225mm thick & 112.5mm thick brick walls. These brick walls will be built with 1:5 cement sand mixture.

Description.Brick walls will be built for internal partition & as well as perimeter walls of the building. All brick walls will be constructed by maintaining the verticality of walls and the location of the wall as per the construction issued Architectural drawings / approved shop drawings for brick walls in each floor.

While constructing the brick walls, opening for the doors, windows & services will be provided according to the dimensions of doors, windows & the dimensions for openings shown in the service drawings by allowing cement / sand plaster thickness of 15mm in each side of the opening.

Method of Brick Masonry. Method of brick will be described as follows,

Construction of brick wall.

Construction of stiffener columns, beams & lintels.

Providing reinforcement anchors to the stiffener columns from the structural beams, walls & columns.

Construction of brick wall Marking for brick walls & openings will be done on structural floor slab according to approved shop drawings.

The floor slab where brick walls to be built will be cleaned.

Reinforcement for stiffener columns will be anchored using HIT-HY 150 chemical at the place where Reinforcement starters would not be provided.

Brick walls with 225mm thick will be built to around 1.5m height in first stage and balance will be completed after curing the wall.

Brick walls with 112.5mm will be built to around 1.0m height in each curing.

Construction stiffener columns, beams & lintels. Stiffener columns will be cast after completing each part of brick walls (~1.5m height)

Lintel beams & stiffener beams will be cast as per the approved drawing at the required level.

If the Reinforcement starters would not be provided at the location of stiffener beams & columns from the structural elements, chemical anchor HIT- HY150 will be used for anchoring Reinforcement to the structural elements.

If the Reinforcement starters would not be provided at the location of lintels from the structural elements, chemical anchor HIT - RE 500 will be used for anchoring reinforcement to the structural elements.

Providing reinforcement anchors to the stiffener columns from the structural beams, walls & columns(Refer the sketch /no 01 attached)

These Reinforcement anchors would be provided while concreting the structural elements and construction detailing for anchors will be carried out as per the attached sketches.

If the anchors have not been provided as per the approved shop drawing / required dimensions chemical anchors HIT- HY150 will be used for anchoring the missing Reinforcement. (Refer attached sketch No 02 for detail of chemical anchoring)

Anchors provided for all the stiffeners columns and the perimeter brick walls at the top of wall will be clipped with 22mm diameter PVC pipe clip & 16mm diameter PVC pipe respectively & filled with grease.

12mm thick polystyrene sheet layer will be place at the top of internal brick walls just at the soffit of structural elements (beam / slab)

12mm thick polystyrene sheet layer will be placed at the top of perimeter brick walls just at the soffit of perimeter beam. This gap at the external face and the internal face will be filled with waterproofing sealant. Literature of waterproofing material will be provided.

Quality Assurance and Quality Control System Following checks & inspections will be carried out.

Locations of brick walls & openings in brick walls will be marked on floor by referring the off lines of main grids.

Verticality & the alignment of brick walls will be checked by using masons plumb.

Cement/ sand mortar will be mixed manually or mechanical mixer & volume of cement & sand will be measured using gauge boxes. Mix ratio of cement & sand is 1:5 (by volume)

Inspection with the engineers representative will be carried out while work is in progress.

Sample of Bricks will be submitted for the approval of engineer.

Construction of BridgesMaterialsThe major materials used for the construction of bridge deck, but are not limited to the following. Concrete (Gr30/20)

Reinforcement

Form work & falls work

EquipmentThe major equipment used for the construction of the Bridge deck includes, but are not limited to the following.

Truck mixtures

Sampling & Testing Equipment

Total Station & Auto Level

Truck Crane/ Mobile crane

Generator

Compressor

Other minor tools

Porker vibrator

Safety Management and ControlSafety precaution will be taken complying with the Road Work Traffic & Safety Manual. Every precaution will be taken to avoid any accidents & damages to adjoining properties, workers, and road users.Deck slab concreting will be poured by directly from tuck mixer by standing on the existing bridge & will maintain the required thickness. Existing Bridge will be closed time to time with help of local Police.All workers will be advised to wear helmets, boots, and gloves while working. There will be a stand by vehicle near site always if needed in a case of accident.The safety officer inspects several times to inspect safety matters.

Method and ProceduresThe method and procedures for the construction of bridge deck will follow the steps below.

Deck Slab ConcreteAs shown in the Drawing falls work will be arranged and form work will be fixed to the correct levels for the deck slab and reinforcement will be tied up as per the keeping required cover to the reinforcement.

Request Engineer or Quality Assurance Manager to inspect the reinforcement and form work and getting approval concreting will start.

Deck slab concreting will be poured by directly from tuck mixer by standing on the existing bridge & will maintain the required thickness.

Following day side form work will be removed and curing will be done 7days.

Form work will be removed and traffic will be allowed only after 28 days.

Finishing work of the Bridge.Once construction completed up to deck level Bridge kerb, end pilasters, up right and hand rails will be fixed. Then after all miscellaneous work will be started and complete construction of the Bridge.Rectification of Damage Wearing CourseMaterialsThe major materials used for rectification of defective wearing course, but are not limited to the following. CRS 1

Asphalt

EquipmentThe major equipment used for rectification of defective wearing course, but are not limited to the following. Asphalt cutter

Double drum roller

PTR

Lorry

Safety Management and ControlSafety precaution will be taken complying with the Road Work Traffic Control Manual. Every precautions will be taken avoid any damages to adjoining properties.Method and ProceduresFollowing procedure will be used to rectify the damaged wearing course.The locations of the defective places will be observed and find out jointly with Engineer.Then the cut wearing course to a width of 500 mm using Asphalt cutter and remove existing wearing course.The cutting to be done continually to include all small patches ( cracks ) as to suit site condition.The tack coat will be spread evenly and lay hot mix asphalt according to the slope and levels.Then the steel plate roller and PTR applying consequently to get the required density.Slurry sealing

MaterialsThe major materials used for slurry sealing work, but are not limited to the following. Aggregate

Filler ( Portland cement )

Emulsion ( CSS 1)

Water

EquipmentThe major equipment used for the slurry sealing, but are not limited to the following. Plate Compactors

Tractor & Trailer

Other minor tools

Man powerMan power used for the access construction, but are not limited to the following. Technical Officer

Skilled Labours

Unskilled Labours

Safety Management and ControlSafety precaution will be taken complying with the Road Work Traffic Control Manual. Every precautions will be taken avoid any damages to adjoining properties.Method and ProceduresFollowing procedure will be used to slurry sealing on the embankment. See flow chart at Appendix A.All loose material, mud spots, vegetation and other objectionable material will be removed immediately prior to applying the slurry.After the preparation of existing surface, a tack coat of diluted emulsion using CSS-1 with water in the ratio of 1:3 will apply at a rate of 0.25 l/m2 0.5 l/m2, 15- 30 minutes before application the slurry seal.Materials will be set according to the design and composition of the slurry mix (Table 6.1) and to the grading requirement (Table 6.2) for aggregate.

Design and composition of the slurry mixAggregate98%

Filler2%

Emulsion13%

Water13%

Grading requirement for aggregate.Sieve sizePercentage by mass of total aggregate passing test sieve

3/8 in (9.5mm)100

No.4 (4.75 mm)100

No.8 (2.36 mm)90-100

No.16 (1.18 mm)65-90

No.30 (600mm)40-60

No.50 (300mm)25-42

No.100 (150mm)15-30

No.200 (075mm)10-20

The Portland cement will be mixed firstly with the fine aggregate thoroughly using shovels.

Then course aggregate will be add to the above mix and rework.

Half of the estimated quantity of water will add to the aggregate cement mix and will mix to achieve a uniform consistency using shovels.

The material obtained from the previous step will make in to a form of an inverted cone with a depression in the middle. The emulsion (CSS-1) will pour into this depression and mixed immediately using shovels.

Addition of emulsion is done in two equal.

The balance water will be add and mixed thoroughly to achieve slurry of uniform consistency for easy spreading.

Cracks will be sealed using above mix with a rate of application of 3.3-5.4 kg/m2.

30 min minutes after leveling the layer will be compacted using a wooden tamper to obtain a uniform surface with even texture and to expedite the setting time of emulsion.

Then two hour after the commencements of the trials the layer will be compact using a plate vibrator.

Newly constructed area will open for normal vehicular traffic after completion of the above compaction with a minimum speed 15kmph.Method Statement for ABC ConstructionAggregate Base CoarseMaterials Aggregate Base Course. (0-40mm)

Water

EquipmentThe major equipment used for the laying of ABC works and compaction, but are not limited to the following.

JCB, and/or Backhoes

Bob Cat

Dump Trucks

Rollers

Motor Grader

Rammers / Plate Compactors

Water Bowser

Sampling & Testing Equipment

Auto Level, Straight Edge & Wedge

Other minor tools

Man PowerMan Power used for the Aggregate Base course works includes, but are not limited to the following.

Site Engineer

Technical Officers

Supervisors

Labours

Safety & Traffic controllers

Safety Management and Traffic ControlAll workers will be advised to wear helmets, boots, and gloves while working. There will be a stand by vehicle near site always if needed in a case of accident. The safety officer inspects several times to inspect safety matters.

Method and Procedures

ABC Indication in drawingGeneralOnce the Sub base is completed ABC 1stlayer will be spread over the widening part and on the existing pavement of the total width of 9.0 m.Aggregate Base Course construction will be done half of the road way at a time and other side permits to go vehicles with out any disturbance.

Before starting the ABC construction both side shoulder preparation will be done for some extend to avoid the wasting of ABC and to shift away of aggregates at the edge compacting.Where (0-40 mm) ABC material has to be spread on a sub-base, the surface of sub-Base should be cleared from any extraneous matter and where the ABC is laid over an existing bituminous pavement, the surface will be lightly scarified and scarified material will be cleaned before laying the base course.ABC will be spread by using of JCB or Motor grader for 1stlayer and the final layer will be spread by motor grader.

The ABC material will be spread after checking all necessary testing, which will be given in specifications and the material will be mix with water at the yard and well saturated material will be transported to the site.After checking the underlying layer for damages or deficiencies, ABC will be spread in layers not exceeding 200 mm & the length of spreading will be 500m or less at a time and compaction will be done by 17 Tons roller.

Before starting the compaction, required water content will be added and mixed ABC with the help of a water bowser, motor grader and compaction will be started using suitable roller depending on the layer thickness. Any areas of segregated course and fine material will be corrected by re-mixing, removing or replacing with well graded material.Rolling will be carries out by a series of overlapping longitudinal passes working from the edge towards the center, in the super elevated section where the rolling will be proceed from the lower edge to the higher edge. After that inspect the compacted surface.The compacted layer will be tested for degree of compaction not less than 98%. After getting required compaction next layer will be started and repeat as mention above up to required levels in the drawings or as instructed by the Engineer.

In cases where an existing ABC layer is to be improved by adding a layer of material less than 100mm thick, the existing surface will be scarified to a certain depth and mixed with the imported material. After that re-compaction will be started as per the specification requirement or as directed by the Engineer.After compaction of ABC layer final finish level will be taken jointly and check for undulation to ensure the surface is within the allowable tolerance.

Traffic will not be allowed to go on the finished ABC layer until the layer covered by prime coat.

Method Statement for Slurry sealingMaterialsThe major materials used for slurry sealing work, but are not limited to the following.

Aggregate

Filler ( Portland cement )

Emulsion ( CSS 1)

Water

EquipmentThe major equipment used for the slurry sealing, but are not limited to the following.

Plate Compactors

Tractor & Trailer

Other minor tools

Man powerMan power used for the access construction, but are not limited to the following.

Technical Officer

Skilled Labours

Unskilled Labours

Safety Management and ControlSafety precaution will be taken complying with the Road Work Traffic Control Manual. Every precautions will be taken avoid any damages to adjoining properties.

Method and ProceduresAll loose material, mud spots, vegetation and other objectionable material will be removed immediately prior to applying the slurry.

After the preparation of existing surface, a tack coat of diluted emulsion using CSS-1 with water in the ratio of 1:3 will apply at a rate of 0.25 l/m2 0.5 l/m2, 15- 30 minutes before application the slurry seal.

Materials will be set according to the design and composition of the slurry mix (Table 6.1) and to the grading requirement (Table 6.2) for aggregate.

Design and composition of the slurry mix

Aggregate98%

Filler2%

Emulsion13%

Water13%

Grading requirement for aggregate.

Sieve sizePercentage by mass of total aggregate passing test sieve

3/8 in (9.5mm)100

No.4 (4.75 mm)100

No.8 (2.36 mm)90-100

No.16 (1.18 mm)65-90

No.30 (600mm)40-60

No.50 (300mm)25-42

No.100 (150mm)15-30

No.200 (075mm)10-20

The Portland cement will be mixed firstly with the fine aggregate thoroughly using shovels.

Then course aggregate will be add to the above mix and rework.

Half of the estimated quantity of water will add to the aggregate cement mix and will mix to achieve a uniform consistency using shovels.

The material obtained from the previous step will make in to a form of an inverted cone with a depression in the middle. The emulsion (CSS-1) will pour into this depression and mixed immediately using shovels. Addition of emulsion is done in two equal.

The balance water will be add and mixed thoroughly to achieve slurry of uniform consistency for easy spreading.

Cracks will be sealed using above mix with a rate of application of 3.3-5.4 kg/m2.

30 min minutes after leveling the layer will be compacted using a wooden tamper to obtain a uniform surface with even texture and to expedite the setting time of emulsion.

Then two hour after the commencements of the trials the layer will be compact using a plate vibrator.

Newly constructed area will open for normal vehicular traffic after completion of the above compaction with a minimum speed 15kmph.

Quality ControlSeveral inspections and verifications will be carried out as described in the above method and procedures to ensure that the steps of the procedure are fully complied with during slurry sealing.Method Of StatementTack Coat and Asphalting

Materials

The major materials used for tack coat & asphalt work, but are not limited to the following.

Asphalt Concrete (Binder Course )

CRS 1

Equipment

The major equipment used for tack coat & asphalt work, but are not limited to the following.

Asphalt Pavers 5.5 m width

Pneumatic Tyred Rollers 10 Tone

Tandem Roller 8 Tone

2.5 T roller

Plate Compactor

Tractor & Trailer

Asphalt Cutter & Breaker

Tractor with Broom 2 m Wide

Dump Trucks 3.5 Cube

Sampling & Testing Equipment

Sprit Level

Compressor 125 cfm

Tack coat sprayer

Straight Edges

Water bowser

Other minor tools

Man Power

Man power used for tack coat & asphalt work, but are not limited to the following.

Civil Forman (Asphalt)

Safety Officer

Lab technician

Surveyor Assistant

Supervisors

Rake Men

Skilled Labours

Unskilled Labours

Responsibility of work carried out lies on every person involve for the job. Site management team, Materials Engineer and Surveyor collectively bear responsibility in guaranteeing the quality of finished product.

Safety Management and Tra.ffic Control

Safety precaution will be taken complying with the Traffic and Safety Plan. Every precaution will be taken to avoid any accidents & damages to adjoining properties, workers, and road users.

All workers will be advised to wear helmets, boots, and gloves while working. There will be a stand by vehicle near site always if needed in case of accident.

The safety officer visits several times to inspect safety matters.

Method and Procedures

Generally tack coat & Asphalt works will be done when the existing surface is dry or sufficiently low in moisture and normally the atmospheric temperature is above the 15oC or as instructed by the Engineer. Before starting Tack Coat & Asphalt Works, the area will be demarcated & safety signs will be properly arranged. Single lane traffic will be managed so that no vehicle commuters suffer unnecessary delay.

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Placing to shouldersFinal rollingTack Coat & Regulating Course

The surface will be cleaned and removed loose and deleterious material from the existing road with the help of compressed air. Request will be made for checking the surface prior to applying the tack coat on existing road.

Tack coat will be applied at required rate 0.25 -0.55 L/m2 on cleaned existing road surface and spray record sheets will be submitted to the engineer on a daily basis for Engineers approval.

Asphalt concrete will be mixed with the approved job mix formula in the Asphalt plant Mixing, transporting, trucks & other machineries, and the physical condition of the asphalt mix will be in accordance with the specification requirements. Loading & transportation will be co-ordinate and spreading, compacting and finishing will be completed during daylight hours unless otherwise adequate illumination will be provided in order to minimize darkness. Night work will be done only due to accepted reason with the Engineer approvals. Delivering of asphalt to the paver will be at a minimum temperature of 135 C as per the specification.

Longitudinal edge will be set along the center line and also the lateral joint will be set staggered. Longitudinal and transverse joints will be made in a careful manner so that well bounded sealed joints are provided for full depth of course.

Asphalt paving will be start immediately after transporting, using asphalt paver, which is capable of spreading, finishing, and providing initial compaction to the asphalt mix such that the surfacing shall be finished to the required lines, grades, levels, dimensions, cross sections or as per the Engineers instructions. Manual spreading will be applied where Asphalt paver operation not applicable.

Immediately after the asphalt mix is spread rolling will be commenced with out under displacement or cracking. The transverse joint, Longitudinal joint, breakdown rolling done by static weight roller and intermediate rolling and final rolling will be done by pneumatic rollers. The final rolling will be completed before the temperature of the mix falls below 90 C.

Newly laid asphalt edge will be hand tampered simultaneously with the break down rolling.

Section of the newly laid asphalt layer will be protected from traffic until the mix has sufficiently hardened and traffic will normally not be permitted over newly laid surface at least for 12 hours after laying or until the temperature of the newly laid surface has achieved the ambient temperature.

The density of all samples taken from the compacted surface course will not be less than 97% of the Marshall Density at the point appropriate to the locations and air void will be the 3 to 7.

Quality Control

Certain inspections, verifications, and tests will be carried out, to ensure the quality and durability of the product as described in the above procedures, as per the requirements given in specifications.

Guide lines for site requirements will be set while continuing the asphalt laying depending on the condition such as roller passes etc, as a rule of thumb.

Measurement Control

Regulating course (Binder Mix) will be measured by tonnage. Certain inspections, verifications, and tests will be carried out, to ensure the quality and durability of the product as described in the above procedures, as per the requirements given in the specification. Approval will be obtained from Engineer for material (Asphalt) delivery sheet daily.

ROAD MARKINGIntroductionRoad surface marking is any kind of device or material that is used on a road surface in order to convey official information. They can also be applied in other facilities used by vehicles to mark parking spaces or designate areas for other uses.

Materials1.Thermoplastic road marking materials

2.Glass beads

Equipment1.Road Marking Machine

2.Gas

3.Rope

4.Chisel.

5.Cleaning equipment

6.Small Tools

Method1.Center line will be set out and get approvals about the Center line before commencement of line marking.

2. Road surface shall be cleaned manually using wire brush and wash the surface where necessary.

3. As per the approved road marking design the road marking lines & symbols will be set out means of white chalk and approval will taken by Engineer.

4. The thermoplastic material is heated in the range of temperature around 170 ~ 200 0C and maintain in the range during the entire laying process.

5. After getting the approval of the temporary marking on the asphalt surface permanent marking shall be carried out by considering required color. This machine has the facility of adding glass beads in to the paint while painting.

6. All roads marking shall be protected from traffic until the marked paint get dry.Method of PlasteringMethod of Plastering1. Internal plastering on surfaces of brick and concrete.

2. External wall plastering.

3. Soffit plastering / Soffit finishing with cement based easy plaster material and wall putty.

4. Improving joint of brick walls & structural concrete joints.

Internal Plastering on surfaces of Brick and ConcreteSurface where plastering is to be done will be cleaned.

Level pegs on walls will be fixed with reference to the off lines to brick walls set out in floors. (Using centre plumb bob and nylon thread).

All the brick walls will be watered before pasting mortar on walls.

First coat mortar filling (1:4 Cement and Sand) up to 15 mm will be applied on surfaces where required mortar thickness exceed 25mm.

Walls and columns will be plastered 1:4 Cement and Sand to achieve semi rough finished surface.

Vertical joint of structural columns / walls & brick walls will be treated by fixing 200mm width chicken mesh with wire nails / concrete nails by centering the mesh to the vertical wall joint.

All the embedded service lines and provisions (Conduits, Boxes and etc. ) will be completed on brick walls and check with the MEP drawings.

Joints between walls and beams will be formed up to a maximum of 20mm and will be sealed using 30 minutes fire rated flexible filler. (Material descriptions will be submitted for the approval of the Engineer)

Internal plastering on surfaces of concrete columns, beams & walls which are aligned with surfaces of brick walls will be plastered and other concrete surfaces will be finished with cement base easy plaster. (Material descriptions will be submitted for the approval of the Engineer).

External Wall PlasteringAlignment and fixing level pegs on external wall surfaces will be done using the surveying instrument / centre plumb bobs.

Projections on the wall surfaces will be chipped off and cleaned after completing the level pegs on walls.

First coat mortar filling (1:4 Cement and Sand) up to 15 mm will be applied on surfaces where required mortar thickness exceed 25mm.

Cement paste on concrete surfaces will be applied to improve the bonding of plaster to the concrete surfaces.

Maximum width of 20mm horizontal grooves between walls and beams will be formed by cutting using grinders with diamond wheels after plastering the wall surface. This groove will be filled with approved weather sealant.

External wall plaster will be finished with rough surface.

1:10 slope at the external side of the window sill will be formed while plastering the window reveals.

Soffit Plastering / Soffit Finishing with Cement Based Easy PlasterThe slab soffits and beams' sides and soffits which are to be smooth surfaced painted finished will be smoothen with easy plaster (Material literature will be submitted separately) and places where concrete surfaces are uneven, will be roughen & leveled with cement and sand mortar plaster before applying easy plaster to make surface smooth.

Improving Joints of Brick Wall & Structural Concrete 200mm wide Chicken Mesh will be fixed at the joint.

Concrete surfaces will be washed and cleaned.

Concrete surface which are to be plastered will be roughen or put spot cement slurry.

Quality Controlling & Quality Assurance Experienced supervisory staff will be employed for carrying out the work.

Selected masons will be engaged for plastering work.

Vertical and alignment of walls will be checked while plastering.

Mixing of mortar will be done under the supervision of foremen.

Sieved sand will be used for plaster.

Before the plastering & without

After the plastering & into the lintel

FORMWORKExecution of WorksFabrication of formworkTypical form work details to perform the shape, lines, levels, dimensions & quality of concrete surfaces of Beams, Columns, RC Wall & Slab are attached separately in attachments. Permanent brick wall form work will be used for lower ground floor beams, pile caps, sump walls and lift walls where the waterproofing will be done. (Pile caps will not be water proofed) Examples: Pile caps & beams in the sump will be formed with sump base for waterproofing. Ply wood form and brick form, both will be used in the sides of pile caps up to the bottom of ground beams, inner face of ground beams at main entrance & most of the structural elements in other areas in ground floor considering the sequence of water proofing and the sequence of concrete casting. Refer drawings 230M/FW/06 and sheet 1, 2 & 3 in the attachments

Materials for Form WorkGI pipes, form ties, threaded bars and P-cones will be used to tie & brace the form work. In addition to that U jacks, T Jacks, Pipe supports and scaffolding frames with GI pipe bracing are used for supporting the form work.

Timber Panels : 12 mm thick marine plywood frame, with 1 x 2, 2x2, 2x4, 4x4, 3x4

Other Accessories: Steel form tie, steel separators, chain, turn buckle, threaded bars.

Installation of form PanelsCleaning the construction joint & marking, leveling will be completed before taking formwork panels for fixing.

Conduit, box-out, earthen rods and other embedded items will be fixed on reinforcement or on shuttering prior to align the shuttering on placing the shuttering. Free fabricated panels for columns, walls, slab beams & pile caps will be handled by using Tower Crane/ Mobile Crane or manually.

Markings / Setting outPile caps, Columns, walls in ground floor & lower ground floor will be marked on screed concrete as per the construction issued drawing / shop drawing.

For fixing bottom form work of beams, beam bottom levels will be measured from off line to structural floor level marked on column and position of beam will be measured from the grid line marked on columns faces & on floor slab.

TOOLS & MACHINERYPower tools will be used for cutting and drilling of formwork materials. Work to be done using machinery such as planning, sizing timber and etc will be done in out side and brought to site. Common hand tools will also be used and lifting belts, lifting chains and cables will be used for moving formwork by crane.

MFE formwork tools

SAFETY & QUALITY ASSURANCEFormwork surface preparation

Release agent will be applied before fixing of form work for columns. Release agents will be applied on slab and beams forms before laying reinforcement and ensure that the release agent does not puddle due to excessive application. No part of the reinforcement or construction joints should be coated with the release agent.

Forms shall be thoroughly cleaned and dust, debris, rust or other stains should be removed. Free water and saw dust will also be removed using Air Compressor or manually. The shutter surfaces will be cleaned before re use and maintain the minimum irregularities.

Construction Joint

Construction joint will be formed vertically, horizontally using ply wood, 2x 2and 1x 2 timber. Loose aggregate and cement grout will be chipped off after removing stopped boards. MS water bar will be used at the construction joints in the water retaining walls such as walls in water sump. Key formation at the middle of ground slab along the construction joint will be made for the slab thicknesses more than 300mm.

Removal of Formwork and SupportsMinimum time for formwork stripping without admixtures.Member TypeMemberEffective Span (m)Minimum Stripping Time (days)

Vertical & UnloadedWall, Column, Beam Side-01

Vertical & LoadedWall, Column or Load bearing structure-03

HorizontalSlab< 3 m

3m 6m

>6mDepend on 7days cube test results (minimum 7days.)

HorizontalBeams< 3 m

3m 6m

>6mMaximum 14days and depend on 7days cube test result. Re-Propping will be done soon after removing F/W additional 7days.

METHOD PRE CONSTRUCTION TERMITE CONTROL TREATMENTPRE CONSTRUCTION SOIL TREATMENTPre Construction Soil Treatment implies laying down a chemical barrier to prevent termites from getting back and forth between wood and soil. Termites need wood for food and soil for moisture, so they constantly travel back and forth between wood and soil. Where this situation does not exist, termites build the shelter tubes (Mud tubes) to span foundation walls and other parts of the building that separate wood from the soil. Besides building the tubes in and over foundation walls, termites may also build them inside the walls if constructed of concrete blocks or other porous material. In the case of slab buildings, termites enter through expansion joints, cracks, opening for utility and service connections.

EXECUTION & SEQUENCE OF WORKStage I Plinth TreatmentOnce the backfilling is completed and prior to lay the leveling screed of ground floor slab, Roding will be done along the edge of beams and on entire slab area at one meter center. Then the termiticide will be injected by means of pressure injection treatment.

In addition to the above treatment blanket spraying will be carried out on soil surface covered by the leveling screed of ground slab. Anti termite treatment will not be done under the base slab of sump, lifts and etc. which are in below the water table.

Stage II Barrier TreatmentOnce the leveling is completed in the building area along the exterior walls for paving Roding will be done along the foundation and termeticide will be injected to soil by creating an one meter wide effective chemical barrier along the exterior foundation.

CHEMICAL USED1. The chemical used will be IMIDACLOPRID based termiticide the strength solution will be 2.5mlt. 1lt water emulsion.

2. The rate of used will be approx. 5Lit of mixture per 1Sq. Meter.

EPA approved chemical will be used for termite control purposes and the treatment process will not make any contamination on the ground water table and surface water sources in and around the site. The termiticide used is agricultural friendly chemical and it will not make any adverse effect on existing and proposed flora and fauna, in the park, such as trees plants and fish in the ponds.

METHOD OF BRICK MASONRY WORKDescriptionBrick walls will be built for internal partition & as well as perimeter walls of the building. All brick walls will be constructed by maintaining the verticality of walls and the location of the wall as per the construction issued Architectural drawings / approved shop drawings for brick walls in each floor.

While constructing the brick walls, opening for the doors, windows & services will be provided according to the dimensions of doors, windows & the dimensions for openings shown in the service drawings by allowing cement / sand plaster thickness of 15mm in each side of the opening.

Method of Brick MasonryMethod of brick will be described as follows,

1. Construction of brick wall.

2. Construction of stiffener columns, beams & lintels.

3. Providing reinforcement anchors to the stiffener columns from the structural beams, walls & columns.

Construction of brick wall Marking for brick walls & openings will be done on structural floor slab according to approved shop drawings.

The floor slab where brick walls to be built will be cleaned.

Reinforcement for stiffener columns will be anchored using HIT-HY 150 chemical at the place where Reinforcement starters would not be provided.

Brick walls with 225mm thick will be built to around 1.5m height in first stage and balance will be completed after curing the wall.

Brick walls with 112.5mm will be built to around 1.0m height in each curing.

Construction stiffener columns, beams & lintels Stiffener columns will be cast after completing each part of brick walls (~1.5m height)

Lintel beams & stiffener beams will be cast as per the approved drawing at the required level.

If the Reinforcement starters would not be provided at the location of stiffener beams & columns from the structural elements, chemical anchor HIT- HY150 will be used for anchoring Reinforcement to the structural elements.

If the Reinforcement starters would not be provided at the location of lintels from the structural elements, chemical anchor HIT - RE 500 will be used for anchoring reinforcement to the structural elements.

Providing reinforcement anchors to the stiffener columns from the structural beams, walls & columns These Reinforcement anchors would be provided while concreting the structural elements and construction detailing for anchors will be carried out as per the attached sketches.

If the anchors have not been provided as per the approved shop drawing / required dimensions chemical anchors HIT- HY150 will be used for anchoring the missing Reinforcement. (Refer attached sketch No 02 for detail of chemical anchoring)

Anchors provided for all the stiffeners columns and the perimeter brick walls at the top

Technorati Tags:Building,construction,enginering,block,brickof wall will be clipped with 22mm diameter PVC pipe clip & 16mm diameter PVC pipe respectively & filled with grease.

12mm thick polystyrene sheet layer will be place at the top of internal brick walls just at the soffit of structural elements (beam / slab)

12mm thick polystyrene sheet layer will be placed at the top of perimeter brick walls just at the soffit of perimeter beam. This gap at the external face and the internal face will be filled with waterproofing sealant. Literature of waterproofing material will be provided.

Quality Assurance and Quality Control System Following checks & inspections will be carried out.

Locations of brick walls & openings in brick walls will be marked on floor by referring the off lines of main grids.

Verticality & the alignment of brick walls will be checked by using masons plumb.

Cement/ sand mortar will be mixed manually or mechanical mixer & volume of cement & sand will be measured using gauge boxes. Mix ratio of cement & sand is 1:5 (by volume)

Inspection with the engineers representative will be carried out while work is in progress.

Sample of Bricks will be submitted for the approval of engineer

Rock Blasting1.Introduction and General Information

This method statement provides the details of the materials, the equipment, the procedure and relevant documents related to the Rock Blasting activity, including the quality control verifications, the measurement verifications, and also the safety precautions to be implemented for this work.1.1.Location of Works

The location of the rock blasting works will be limited to selected areas bound within the Right of Way (ROW).

2.MaterialsThe major materials used for the rock blasting works include, but are not limited to the following. Explosive

Dynamite

Electric Detonators

Ammonium Nitrate

Other Barricade Tapes

Warning Boards

Sand bags

Metal plate

3.EquipmentThe major equipment used for rock drilling and blasting works include, but are not limited to the following. Jack Hammers

Air Compressor

Circuit tester

Tamping rod

Siren

Tractor

JCB

Other minor tools

4Man PowerMan Power used for rock drilling and blasting works include, but are not limited to the following. Mining Engineer

Supervisor

Blasting Forman

Skilled labor 02

Unskilled 04.

5.Safety Management and Control

5.1Control of Fly Rock In the areas where the fly rock needs to be controlled, the charged boulders will be covered using a metal plate, used tyres and Sand Bags.

Drilling direction will be selected in accordance to avoid Fly Rock flying on to houses.

5.2Warning Procedure to the Resident, Workers and Any Other Parties Siren will be used before the blasting start.

Closing of all entrance before blasting.

6.0Method and Procedures

Method and procedures for rock blasting works are as follows.

Before the commencement of the work, the Engineer will be notified of the areas where rocks are to be blasted. Accordingly, the Engineer will inspect the area for approval before commencement of the works.

6.1Rock DrillingRock drilling will be carried out by jack hammer.Hole depth less than or equal 1m, 1 hole /one boulder if boulder