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Micro-surfacing Construction Section 37.3.01C(3) Micro-surfacing.

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Presentation on theme: "Micro-surfacing Construction Section 37.3.01C(3) Micro-surfacing."— Presentation transcript:

1 Micro-surfacing Construction Section 37.3.01C(3) Micro-surfacing

2  Mix Design  Materials  Equipment  Construction Procedures  Quality Control  Quality Assurance to be covered Topics to be covered

3  Mix Design Proportion Limits Submit laboratory test results and proposed Micro-surfacing mix design. Mix design Section 37-3.01D(4)(c) MaterialProportion limits Micro-surfacing emulsion residual asphalt 5.5-9.5% of aggregate dry weight Water and additivesNo limit Mineral filler0-3% of aggregate dry weight

4 Micro-surfacing Mix Design Tests Submit laboratory test results and proposed Micro-surfacing mix design. PropertyInternational Slurry Surfacing Association test method Specification Wet cohesion @30 minute (set), min kg-cm @ 60 minute (traffic), Min kg-cm Technical Bulletin 139 12 20 Excess asphalt, max, g/m 2 Technical Bulletin 139540 Wet stripping, min, %Technical Bulletin 11490 Wet track abrasion loss 6-day soak, max, g/m 2 Technical Bulletin 110810 Displacement Lateral, max, % Specific gravity after 1000 cycles of 57 kg max Technical Bulletin 147A 5 2.10 Classification compatibility, min, grade points Technical Bulletin 144 (AAA, BAA) 11 Mix time @ 25 o CTechnical Bulletin 113Controllable to 120 seconds Section 37-3.01D(4)(c)

5  Aggregate  Polymer Modified Asphaltic Emulsion  Mineral Filler Materials Section 37-3.02C(2), (3) & (4)

6  Aggregate-must meet the following gradation -CT 202 Micro-surfacing Aggregate Gradings Materials Section 37-3.02A Percent passing by aggregate type Sieve sizesIIIII 3/8”100 No. 494-10070-90 No. 865-9045-70 No. 1640-7028-50 No. 3025-5019-34 No. 2005-15

7  Micro-surfacing aggregate-must meet the following quality characteristics Aggregate Quality a Crushed particles must have at least 1 fractured face b California Test 211 must be performed on the aggregate before crushing. Materials Section 37-3.02A Quality characteristicTest methodSpecification Sand equivalent, minCalifornia Test 21765 Durability index, minCalifornia Test 22965 Percentage of crushed particles, min a California Test 20595% Loss Angeles Rattler Loss at 500 revolutions Max b California Test 21135%

8  Homogeneous mixture of asphalt, polymer and emulsifier solution  Minimum 3% polymer by weight of residual asphalt b Materials, MICRO-SURFACING EMULSION Section 37-3.02C

9 .b.b Materials, MICRO-SURFACING EMULSION Micro-surfacing Emulsion Section 37-3.02C(3) Property Test MethodValue Saybolt Furol Viscosity @25 o CAASHTO T 5915-90 Seconds Sieve test, max a AASHTO T 590.30% Settlement, 5 days, max b ASTM D 2445% Storage stability, 1 day, maxAASHTO T 591% Residue by evaporationCalifornia Test 331 62%

10 Materials, MICRO-SURFACING EMULSION Micro-surfacing Emulsion Residue by Evaporation Properties Section 37-3.02C(3) Property Test MethodValue G * @ 20 o C, 10tad/sec, MPaAASHTO T 315Report only Penetration @ 25 o CAASHTO T 4940-90 Phase angle @ 50 o C, 10rad/sec, PA (maximum)-PA base AASHTO T 315Report only Softening point, min, o CAASHTO T 5357 Stiffness @ -12 o C, Mpa, and M- value AASHTO T313Report only

11  Portland cement is used as mineral filler  Must be Type I, Type II or Type III cement  Other additives may be added to control the emulsion set time depending upon weather conditions Materials-Mineral filler & other additives Section 37-3.02C(4)

12  Truck mounted mixer-spreader unit or continuous self loading mixing machine  Capable of proportioning micro surfacing emulsion using a positive displacement pump.  Must be calibrated in compliance with Caltrans Material Plant Quality Program (MPQP)  Variable Rate Emulsion Pump must be calibrated & sealed in calibrated condition under Caltrans MPQP Equipment Section 37-3.03C(5)a

13  Spreader boxes ≥ 8 ft. wide must have;  Baffles or motor driven reversible augers  Ensure uniform application on superelevated sections and slopes  Must have a series of strike off devices at rear  The leading strike off device must be; Fabricated of suitable material such as steel or natural rubber Designed to maintain close contact with the pavement during spreading Capable of obtaining the specified thickness Capable of being adjusted to the various pavement cross sections Equipment Section 37-3.03C(5)b

14  The final strike-off device must be ; Fabricated of flexible material that produces a uniform smooth texture in the finished surface Cleaned daily and changed if longitudinal scouring occurs in the micro-surfacing  Shoulder Equipment  Edge box shoulders must form clean, straight joints and edges Equipment Section 37-3.03C(5)b & c

15  Scratch Course Box  Scratch course box must have an adjustable steel strike-off device for final strike-off  Wheel Path Depression (Rut) Box must have  5-6 feet adjustable strike-off device to regulate depth  Hydraulic augers capable of: Moving the mixed material from the rear to the front of the filling chamber Guiding larger aggregate into the deeper section of the wheel path Forcing the finer material towards the outer edges of the spreader box Equipment Section 37-3.03C(5)d & e

16  Pneumatic Tired Rollers ≥ 3000 lbs. Load per wheel for scratch & rut fill courses  Self Propelled Power Brooms & Vacuums  If using truck mounted mixer spreaders for placement, minimum of two mixer spreaders required at site Equipment Section 37-3.03C(5)a & d

17 Construction Procedures  Proper surface preparation  Fog the pavement surface if necessary  Place approved micro surfacing mixture in wheel path depressions (ruts) with a rut box  Do not apply more than 0.12’ thick layer at a time  Apply multiple times to fill the depressions  Allow Mat to Cure or Cool  Allow traffic to compact micro surfacing for 12 hours before placing next micro surfacing layer.

18 Construction- Surface Preparation-Existing Pavement Section 37-2.03D Surface Preparation

19 Construction- Surface Preparation-Existing Pavement Section 37-2.03D Surface Preparation  Clean Pavement surface.  Remove loose particles of extraneous materials, including paving and dirt.  Use non destructive methods such as flushing and sweeping.

20 Construction- Surface Preparation-Existing Pavement Section 37-2.03D Surface Preparation  Cover all exposed facilities before micro surfacing application.  Reference all covered facilities properly for easy location.  After micro surfacing application, expose the covered facilities.  All starts and stops on roofing felt to ensure clean sharp joints  Fog the roadway surface before the spreader box

21 Construction- REPAIR WHEEL PATH DEPRESSION  Fill wheel path depressions & irregularities with a scratch course, where specified.  If the depressions are ≥1/2” use wheel path depression (rut) box to fill the depressions  Place layers not ≥0.12’ in one pass.  Allow for 12 hours compaction by traffic before placing the next layer. Section 37-3.03D(2)(c)

22 Construction –Applying MICROSURFACING  After filling the wheel path depressions & irregularities with a scratch course, place the final micro surfacing layer.  Allow Micro surfacing to cure and set.  Open to traffic after brooming. Section 37-3.03D(2)(c)

23 Construction- Joints  Longitudinal and transverse joints must be; Uniform Straight Neat in appearance Butt type joints Without material build up Without uncovered areas On centerlines, lane lines, edge lines or shoulder lines With not more than 3” overlaps Section 37-3.03D(4)(a)(i)

24 Construction- WEATHER restrictions Section 37-3.03D(4)(a)(ii)  Place when both pavement and air temperatures ≥ 50 o F and rising.  Do not place if pavement and air temperatures ≤ 50 o F and falling.  Expected high temperature ≤ 65 o F within 24 hour of placing.  No placement if rain is imminent or air temperature is expected to go below ≤ 36 o F.

25 Quality CONTROL-CONTRACTOR Section 37-3.02C(2) Quality characteristicTest methodSpecification Sand equivalent, minCalifornia Test 21765 Durability index, minCalifornia Test 22965 Percentage of crushed particles, min a California Test 20595% Loss Angeles Rattler Loss at 500 revolutions Max b California Test 21135%  Micro-surfacing aggregate Aggregate Quality a Crushed particles must have at least 1 fractured face b California Test 211 must be performed on the aggregate before crushing.

26 .b.b Quality Control-contractor Micro-surfacing Emulsion Section 37-3.02C(3) Property Test MethodValue Saybolt Furol Viscosity @25 o CAASHTO T 5915-90 Seconds Sieve test, max a AASHTO T 590.30% Settlement, 5 days, max b ASTM D 2445% Storage stability, 1 day, maxAASHTO T 591% Residue by evaporationCalifornia Test 331 62%

27 Quality control-contractor Micro-surfacing Emulsion Residue by Evaporation Properties Section 37-3.02C(3) Property Test MethodValue G * @ 20 o C, 10tad/sec, MPaAASHTO T 315Report only Penetration @ 25 o CAASHTO T 4940-90 Phase angle @ 50 o C, 10rad/sec, PA (maximum)-PA base AASHTO T 315Report only Softening point, min, o CAASHTO T 5357 Stiffness @ -12 o C, Mpa, and M- value AASHTO T313Report only

28 Control Quality Control Inspection Pre-Application Inspection  Surface preparation  Equipment inspection Continuous self loading mixing machine or truck mounted mixer spreader, min. 2 nos. Spreader box Shoulder equipment/Edge box Scratch course box & wheel path depression box Brooms Section 37-3.03C(1), (2) &(3)

29 Quality Control Pre- Application Inspection (cont.)  Micro surfacing application rate  Traffic control plan and setup

30 Quality ASSURANCE - construction Inspection  Micro surfacing aggregate application rates  Start & stop operations  Traffic Control & Trucking operation  Rolling

31 Quality ASSURANCE - construction Inspection  Longitudinal joints – ensure no material buildup  Transverse joints – ensure clean joints, start and stop on roofing felt  Brooming to ensure absence of loose aggregate

32 Quality Control /ASSURANCE Post-Application Inspection  Cleanup  Opening to traffic

33 Thank you


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