w13 special micro surfacing applications-proteau

Special Micro-surfacing applications W13 session

APWA 2013 Annual meeting,

Jacksonville, FL

Contents

Definition of Microsurfacing technology;

Formulations

Fields of application;

Gap Graded formulations

Utilization of Synthetics fibers

Crack relief system with using Microsurfacing:

Heavy duty Crack relief system using Microsurfacing

Colored microsurfacing

Futurs developments

Definition of Microsurfacing technology

Definitions of Microsurfacing technologies

The microsurfacing material is special cold mixture applied atultra-thin thickness of 7 à 15 mm (1/4 to ½”), as surface layer,to intend of friction adherence and to seal the existing surface.

A maintenance Technique� Preventive :

To prevent some future superficial degradations of the surface pavement.

� Corrective : To correct superficial degradations of a surface pavement

MicrosurfacingDefinitions of the constituents

1. Aggregates

2. Mineral Filler

3. Bitumen Emulsion

4. Water

5. Fibers(depending of the application)

MicrosurfacingCriteria of selection – Speed of the intervention

Aggregates FillerWater additives

Emulsion

Spreader box

Direction

Mixing time15 to 45 sec

Brown Mix and homogeneous

Black mat

Setting time2 to 10 minutes

Opening to traffic between 30 - 60 minutes

.Setting time 10 minutes

.Time for traffic opening < 60 minutes

MicrosurfacingDefinitions - Production

Mobil unit machine

o Transportation of the constituents

o Storage of the constituents

o Dosage of the constituents

o Mixing of the constituents

Application by a spreader box with variable width Continuous Unit

Traditional Unit Semitrailer Unit

Congrès Bitume Québec- 31 mars 2011 - page 8

Mobil Unit •Storage•Dosage

Spreader box•Mixing and - laying

Microsurfacing

Speed of application :8000 to 25 000 sy² per day

MicrosurfacingDefinitions - Production

Microsurfacing Formulation study

Mixing and setting time tests

• Allow to determine the compatibilty between the components

• Determination of the mixing time and setting time.

Cohesion test

• Benedict cohesion tester: application of a torque on a sample through a rubberdisk with a charge of 200 kPa.

• Cohesion mesured on Microsurfacing samples at differents curing time (30, 60and 90 minutes)

Testing after curing

Wet Track abrasion test (WTAT)

o Determination of the abrasion resistance of the mixture (in fonction ofthe bitumen content)o Simulation of abrasion from the vehicules tires (curves)o Determination of the minimum bitumen contant

Load wheel tester (LWT) – Bleeding susceptibility

o Determination of the maximum bitumen content where risks of bleedingappears

Wet track abrasion test (WTAT)

Load wheel tester (LWT)

Specifics performances testso Lateral displacement whit LWT for rutting correction application

Specifics performance tests

o Schulze-Breuer compatibility

Grade Point Abrasion (g) Integrity % retenu

Adhesion% enrobage

A 4 0 – 0.7 90 – 100 90 – 100

B 3 0.7 – 1.0 75 – 90 75 – 90

C 2 1.0 – 1.3 50 – 75 50 – 75

D 1 1.3 – 2.0 10 - 50 10 -50

Fields of application

MicrosurfacingField of application

Wearing course, maintenance or new pavements

(highways, urban and rural streets, residentials)

Bicycle lanes, Parkings

Cape Seal : Chips seal + Microsurfacing

Dangerous zones ‘’accidents’’

(Gap graded formulation)

Colored surfaces

MicrosurfacingSelection Criterias

Security and noise efficiencyReduction of aggregates loss (in comparison of chips seal)No bleedingLess noisy

Service lifeLong term skid resistanceTrafficable at early age

EstheticImprovement with circulation (joints)Possibilty of Coloration

Preparation worksNo milling required (ruts less than ¾ inch)No tack coat required

Works durationReopening to the traffic very fastLess traffic interruption

PavementCondition

Time (Years)

Slurry Seal Micro-

Surfacing

Chip Seal

Hot-In Place /

Cold-In Place

Mill & Overlay

Reconstruction

REDUCE

RECYCLE

RE-USE

“The Right Product, On the Right Road, At The Right Time”

FDRCape Seal

Note: Selection of product is very dependent on existing surface deterioration and traffic requirements.

MicrosurfacingLimits of application

Unefficient (single layer) against crack reflection

No reprofiling and reinforcement effects

Consider the pavement structure capacity

Double application always better

MicrosurfacingPreparation and intervention

Support preparation

Deformations and defects survey

Treatment in fonction of the support condition

Structural deficienciesCorrection before microsurfacing application

Superficials defects: stripping / raveling

Corrections of deformations of the supports withoutshowing any structural deficiencies

Microsurfacing interventions = Number of layers in function of the déformations

Choice of treatment in function of Ruttingdeformation:

Deformation less than ¼ inch;

Deformation between ¼ and ¾ inch;

Deformation more than ¾ inch

Deformation less than ¼ inch;

Crack filling of cracks over 1/4 inchPreparation of the supportCleaning of the surfaceMicrosurfacing application:

Double layers (always better)Or single application if the support have no deformation

Protection of the utilities (covers, joints)

Drains covers protected by papers or plastic film

Existing Markings:

Stripping of thermolastic markings

Emulsion application over paint markings

Cleaning of the surface:

Sweeping of the surface to remove any debris

Water projection if necessary

Application of the Microsurfacing (deformation < ¼ inch ):

A first correction layer of 5 to 8 kg/m² ( 9 to 14 lb/sy) « Scratch coat »

A final application of ± 10 kg/m² (18 lb/sy)

Steel edge

Full width

Application of the Microsurfacing (deformation between¼ to ¾ inch) :

Cleaning of the surfacePreparation of the supportRut filling with microsurfacingDouble application of Microsurfacing (always better) or single

applicationScratch coat 5 to 8 kg/m² ( 9 to 14 lb/sy)

Wearing course ± 10 kg/m² (18 lb/sy)

Ruts filling with microsurfacing;

In condition of:

Presence of wearing;The ruts deformation are stabilizedThe support have a good enough structural capacityNo alligator cracks

The ruts have to be fill with adapted microsurfacing mix formulation

Ruts filling with Microsurfacing

The Rutting box

MicrosurfacingDefinitions – Rates of application

ISSA A-143 Rate of application Québec

Type II Type III Type 1 et type 2

Suggered rates of application (Kg/m²)Without ruts fill 6 to 11 Kg/m²

11 to 20 lb/sy8 to 16 kg/m²9 to 30 lb/sy

8 to 12

MicrosurfacingRecommanded Rates of application from ISSA

Rate of application(Type III only)

(For every mm of microsurfacing mix, add 3 to 5 mm as a crown to allow for compaction under traffic)

Ruts depth

12 - 19 mm 11 to 16 kg/m²

19 - 25 mm 14 to 19 kg/m²

25 - 32mm 15 to 21 kg/m²

32 - 38 mm 17 to 22 kg/m²

Rate of application(Type III only)

(For every inch of microsurfacing mix, add 0.125 in to 0.25 in as a crown to allow for compaction under traffic)

Ruts depth

0.5 – 0.75 inch 20 to 30 lb/yd²

0.75 – 1.00 inch 25 to 35 lb/yd²

1.00 – 1.25 inch 28 to 38 lb/yd²

1.25 – 1.50 inch 32 to 40 lb/yd²

Application of Microsurfacing (deformation > ¾ inch ):

Reprofiling with cold milling or micro milling;Cleaning of the surface;Double application of microsurfaing:

Scracth coat of 5 to 8 kg/m² (9 to 14 lb/sy;

Wearing course of ± 10 kg/m² (18 lb/sy)

Gap Graded formulations

Components of Gap graded micro-surfacing

Binder : PMA emulsion

Aggregates: Gap-Graded gradation

Selected Fibers

Type of fibers

Dosing of fibers

Effect of fibers on the mix

The very dense fiber network significantly modifies the rheological behaviorof the mix, giving short and long-term benefits.

The addition of fibers increases the apparent viscosity of the mix. Theapparent viscosity increases by a factor of ten. This fibers network avoid anysegregation in the spreader box, allowing the use of special Gap gradedgradation.

Microsurfacing with Gap graded gradation

Aggregate : Example of gradation and quality tests

TEST TEST METHOD SPECIFICATION Value

Sand equivalent Value of soils

and fine aggregates

ASTM D2419 65 % minimum 66%

CPP (Polissing Coefficient by

projection) � PVN

LC 21-102 0.45 0.56

Resistance to degradation in

Micro-deval machine

LS 609 16 % 8.5%

0.01 0.1 1 10

Sieves (mm)

ISSA Type III gradation

0.01 0.1 1 10Sieves (mm)

Gap graded 0-6 mm

Surface characteristics

Macro-texture, average texture depth, Sand patch test (initial)

0/6 ATD around 0.8 mm

0/10 ATD > 1 mm

Skid resistance (initial)

BFC at 40km/h > 0,50

BFC at 120km/h > 0,35

BPN > 0.70

Higher the grading, higher the BFC

A Gripfibre® 0/10 has been laid on a section of A71 highway (2 km).

Braking-force coefficient has been measured after 6 and 18 months.

GripfibreGripfibreGripfibreGripfibre®®®® productproductproductproduct

40 50 60 70 80 90 100 110 120

Speed (km/h)

Evolution of braking-force coefficient on motorway A71 after 6 and 18 months of service

BFC after 6 months on slow lane

BFC after 18 months on slow lane

BFC after 6 months on fast lane

BFC after 18 months on fast lane

Upper and bottom thresholds

measured on national roads

High skid resistance microsurfacing mixHigh skid resistance microsurfacing mix

The use of synthetic fibers:

Synthetic organic fibers

0.1 to 0.2% in relation to aggregates

Thin and long (4 to 6 mm)

Several million of fibres per m²

Pretreated for a better dispersion

Use of a Fiber Cutter system

Laying made easier

Against segregation and trickles

Improved performances

Allow gap-graded formulas to be used

Ensure a better long lasting skid resistance

Fibers specially designed dosing unit:

Ready to use Fibers

A143 Recommended performance guideline:

Synthetic organic fibers

0.1 to 0.2% in relation to aggregates

Thin and long (4 to 6 mm)

Several million of fibres per m²

Laying made easier

Against segregation and trickles

Improved performances

Allow gap-graded formulas to be used

Ensure a better long lasting skid resistance

Résults Requir.

mixing time at 25 °C (sec) 210 120 min

setting time (min) 13 -

Résults Requir.cohesion at 30min (Kg.cm) 15 12 mincohesion at 60min (kg.cm) 22 20 min

Preblended aggregatesPortland cementPremix waterretarderEmulplast EC (04-2)

Résults Requir. 1hour soak (g/m2) 257 538 max 6 days soak (g/m2) 691 807 max Asphalt content (based on aggregates)

OTHER TESTSRésults Requir. Résults Requir.

Excess Asphalt by LWT (g/m2) 257 538 max Specific gravity after 1000 cycles of 57 kg 1,978 2,10 maxWet Stripping (%) 95 + 90 min Classification Compatibility BAA AAA ou BAALateral Displacement (%) N/A 5 max

4 - 6mm - selecteg aggregates - New-Brunswick

0-2mm - selecteg aggregates - New-Brunswick

MIXING - CONSOLIDATION

WET COHESION

WET TRACK ABRASION LOSS

AGGREGATES

MIX DESIGN AT 20°C (Based on aggregates)

MIX FORMULATION

Synthetics Fibers

Modifications proposal:4.2 Aggregate

4.2.3 Gradation

0.01 0.1 1 10

Sieves (mm)

Passing (%)

Gap graded TYPE IV

Recommandations:

The rut fill have to be realized with type III mix;

Recommandation to always realized a type III scratch coat before

the application of Type IV mix wearing course;

The fibers dosing unit have to be specially designed to this

application;

Aggregates gradation for gap-graded mix:

Blend of 0 -1/8 and 1 /4 - 3/8:

Crack relief system with using

Microsurfacing

Hot applied Membrane + Fibrous microsurfacing

Crack inhibitor system FLEXIPLAST®

Support fissuré

Nouvelle couche de roulement

} Flexiplast

• Very efficient system against crack rising type :

• Thermal shrinkage

• Longitudinals, transversals

• polygonals

• Efficient System on every kind of support, without structural weakness.

• Support Waterproofing effect.

• Good bonding between HMA layers.

Crack relief system FLEXIPLAST®

New wearing course

Cracked support

Crack relief system FLEXIPLAST®

-5°C, after > 320 000 cycles, no

crack rising,

-Horizontal displacement 24 µm

-Vertical displacement 19 µm

+ 5°C, after >178 000 cycles, no

crack rising,

-Horizontal displacement 111 µm

-Vertical displacement 18 µm

Crack inhibitor system FLEXIPLAST®

- Comparison of systems efficiencies at -5°C

Colored microsurfacing

Red colored

Conventional bitumen emulsion

Aggregates (pink porphyre)

Iron oxide pigment

COLORED MICRO-SURFACINGS

RD 14 Cazouls-les Béziers (34), in 2005

Red colored

Footpaths in Zénith – Clermont Ferrand (63) – 2004

Red colored

Microsurfacing before Abrasion test Microsurfacing after Abrasion test

Private property access – Sigogne (16)

Use of synthetic binder emulsion

Use of synthetic binder emulsion or Conventional emulsion

Green colored

Microsurfacing before Abrasion test Microsurfacing after Abrasion test

Orange

Synthetic emulsion

Selected aggregates

Iron oxide

Futurs developments

Use of synthetic binder (colored mix)

Special formultion for ruts filling

Use of recycling asphalt pavement RAP as aggregate

50-75% of RAP

Less emulsion

FUTURS DEVELOPMENTS

Janvier 2011 - page 65

Thanks for your attention

w13 special micro surfacing applications-proteau

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