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Mandatory Prepaving Conference. Micro-surfacing Construction. Section 37.3 .01C(3) Micro-surfacing . Topics to be covered. Mix Design Materials Equipment Construction Procedures Quality Control Quality Assurance. Mix design. Mix Design Proportion Limits

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mandatory prepaving conference

MandatoryPrepaving Conference

Micro-surfacing Construction

Section 37.3 .01C(3) Micro-surfacing

slide2

Topics to be covered

  • Mix Design
  • Materials
  • Equipment
  • Construction Procedures
  • Quality Control
  • Quality Assurance
slide3

Mix design

  • Mix Design Proportion Limits
  • Submit laboratory test results and proposed Micro-surfacing mix design.

Section 37-3.01D(4)(c)

slide4

Micro-surfacing Mix Design Tests

  • Submit laboratory test results and proposed Micro-surfacing mix design.

Section 37-3.01D(4)(c)

slide5

Materials

  • Aggregate
  • Polymer Modified Asphaltic Emulsion
  • Mineral Filler

Section 37-3.02C(2), (3) & (4)

slide6

Materials

  • Aggregate-must meet the following gradation -CT 202
  • Micro-surfacing Aggregate Gradings

Section 37-3.02A

slide7

Materials

  • 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.

Section 37-3.02A

slide8

Materials, MICRO-SURFACING EMULSION

  • Homogeneous mixture of asphalt, polymer and emulsifier solution
  • Minimum 3% polymer by weight of residual asphalt

b

Section 37-3.02C

slide9

Materials, MICRO-SURFACING EMULSION

Micro-surfacing Emulsion

  • .

b

Section 37-3.02C(3)

slide10

Materials, MICRO-SURFACING EMULSION

Micro-surfacing Emulsion Residue by Evaporation Properties

Section 37-3.02C(3)

slide11

Materials-Mineral filler & other additives

  • 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

Section 37-3.02C(4)

slide12

Equipment

  • 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

Section 37-3.03C(5)a

slide13

Equipment

  • 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

Section 37-3.03C(5)b

slide14

Equipment

    • 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

Section 37-3.03C(5)b & c

slide15

Equipment

  • 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

Section 37-3.03C(5)d & e

slide16

Equipment

  • 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

Section 37-3.03C(5)a & d

slide17

ConstructionProcedures

  • 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.
slide18

Construction-Surface Preparation-Existing Pavement

Section 37-2.03D Surface Preparation

slide19

Construction-Surface Preparation-Existing Pavement

  • Clean Pavement surface.
  • Remove loose particles of extraneous materials, including paving and dirt.
  • Use non destructive methods such as flushing and sweeping.

Section 37-2.03D Surface Preparation

slide20

Construction-Surface Preparation-Existing Pavement

  • 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

Section 37-2.03D Surface Preparation

slide21

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)

slide22

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)

slide23

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)

slide24

Construction- WEATHER restrictions

  • Place when both pavement and air temperatures ≥50 oF and rising.
  • Do not place if pavement and air temperatures ≤50 oF and falling.
  • Expected high temperature ≤65 oF within 24 hour of placing.
  • No placement if rain is imminent or air temperature is expected to go below ≤36 oF.

Section 37-3.03D(4)(a)(ii)

slide25

QualityCONTROL-CONTRACTOR

  • 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.

Section 37-3.02C(2)

slide26

Quality Control-contractor

Micro-surfacing Emulsion

  • .

b

Section 37-3.02C(3)

slide27

Quality control-contractor

Micro-surfacing Emulsion Residue by Evaporation Properties

Section 37-3.02C(3)

slide28

Quality Control

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)

slide29

Quality Control Pre-Application Inspection (cont.)

  • Micro surfacing application rate
  • Traffic control plan and setup
slide30

Quality ASSURANCE - construction Inspection

  • Micro surfacing aggregate application rates
  • Start & stop operations
  • Traffic Control & Trucking operation
  • Rolling
slide31

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
slide32

Quality Control /ASSURANCE

Post-Application Inspection

  • Cleanup
  • Opening to traffic