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NEW MATERIALS AND TECHNOLOGIES USED IN CPWD AT MUMBAI

USE OF NEW MATERIALS AND TECHNOLOGIES BY CPWD AT MUMBAIDR K M SONICHIEF ENGINEER, CPWD, MUMBAI

Post Tensioned SlabsPOST TENSIONED SLABSCBI OFFICE BUILDINGNISM BUILDINGS (PARTLY)INCOME TAX BUILDING UNDER CONSTRUCTIONIDBI BUILDING UNDER CONSTRUCTION

ADVANTAGES OF PT SLABSIncreased clear spans.Thinner slabs.Lighter structures.Reduced cracking and deflections.Reduced storey height.More storeys in same height of buildingsRapid construction.Economy in construction Quality

Advantages of PT SlabMaterial SavingsReduction in concrete is due to thinner concrete members.Reduction in rebar in floor elements.Reduction in dead load resulting into saving in concrete and reinforcement of structural members including foundation.Saving in building cladding, vertical mechanical/service elements, rebar and concrete in shear walls and other materials due to lesser sizes.

Advantages of PT SlabFaster ConstructionPotential pour cycle of 3-4 days.Reduced re-shoring requirements.Coordination with embeds and MEP openings.

Advantages of PT SlabIncreased PerformanceImproved seismic behavior.Reduced deflection and vibration.Improved crack control and water proofing properties, especially beneficial for parking garages and balconies.Longer spans and fewer columns give greater flexibility in floor layouts in office/residential buildings and better lighting in parking garages which enhances personal safety.

Advantages of PT SlabReduced Lifetime CostsLower maintenance and lifecycle cost. Reduced building height resulting to more headroom and energy savings.Potential for green building norms.

Steps in construction DesignThe existing design has been based on Presscrete Post-Tensioning System (PPS). Concrete in one member panel shall be placed in one operation continuously without interruption.ConcretingCare is taken that the pre-stressing tendons do not get displaced or damaged prior to casting and during casting. It is ensured that discharge of concrete is not directed onto the pre-stressing tendons. Vibrating is avoided from coming into contact with the pre-stressing tendons whenever possible. Proper compaction of the concrete in anchorage areas is ensured due to high local stresses in these areas and care taken that all the grout hoses remain exposed and protruding from the concrete surface. StressingAfter concreting, the carpenter removes the vertical sides end form work. All the stressing recesses are cleared and pre-stressing barrels and wedges fixed to all pre-stressing castings. When concrete has reached the transfer strength as per the shop drawings (from the results of cube tests), stressing of cables is carried out. All cables are tensioned to the required jacking force and monitored through the pressure gauges. GroutingExcess cable length is cut after the stressing. All pre-stressing tendons are ensured to be flushed with clean water. Grout is mixed according to the design mix for at least two minutes until a colloidal consistency is produced. The water is put into the container first and the cement is then slowly added. When the cement and water are thoroughly mixed, the non-shrink additive added to the mix. The grout then is injected into the pre-stressing tendons. Grouting is carried out by injection at one end of the duct until clear grout flows out from the other end. The grout hose at the both end is then sealed. Grouting works commence when all scaffolds at a particular storey where grouting works are to be carried out, are removed.

LimitationsSince the cables or tendons in the slab have been stretched to hightensile strengths, it is extremely important that the slab is not drilled, cut, chiselled or disturb in a way so as to expose the tendons

AAC BLOCKSLOW DENSITYGREEN MATERIAL

Service trenchesNot a very new conceptBeing adopted in NISM

GFRC PANELS IN FACADECan be manufactured in many shapesCan be painted

STAMPED FINISH CONCRETE Can be achieved in desired coloursThe process includes preparation of sub-grade, placing of forms, providing reinforcement for stability, placing the concrete, screeding and finishing the concrete, applying colour and stamping the concrete using desired moulds.

Stamped finish concrete

Innovative FlooringsWood plastic composite flooring, Maple hardwood sports flooring for special applications, Geofoam block flooring Crazy patterned flooring of leather finish, flamed and polished granite Italian marble flooring

GEOFOAM FLOORING IN STEPS

Seating arrangement of class rooms

Innovative False CeilingAcoustic false ceiling Cloud acoustic false ceiling

ACCOUSTIC FALSE CEILINGAnutone False ceiling

Double Stack Car Parking

GlassStructural GlazingPartitionsFire resistant LobbiesDoorsMuralsSolar PV Panels

Dry Stone Cladding

STP

SOLAR ROOF TOP PANELS

AHU ON TOILET SLAB

SYNTHETIC GRASS

FOLDABLE PARTITION

LOUVERS

Energy efficiencyIn new buildings only LED fitting or energy efficient T5 fittings are provided.Energy efficient Chillers are provided Solar roof top PV PanelsRecycling waste waterRain water harvesting

Pumping systemCPWD has adopted hydro-pneumatic pumping system for water supply in most of large projects.

Green buildingsCPWD is constructing all green buildings and getting them rated in MumbaiCBI 4 star GRIHAIDBI Belapur 3 star GRIHANISM 4 star GRIHANTH 3 star GRIHAIncome Tax Building 4 star GRIHA

CBI OFFICEBUILDING

NATIONAL INSTITUTE OF SECURITIES MARKETS

MDP Hostel

Residential Block

Hostel corridor

MDP Hostel

Residential Block

Hostel corridor

Student and MDP Hostel blocksResidential BlockNISM : Images Orientation Block

Academic BlockAmphitheater

Hostel & MDP BlockLandscape development Orientation Block

THANK YOU

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