Download - LLP HMA Reclaimed Asphalt Pavement ( RAP)

LLP HMAReclaimed Asphalt Pavement ( RAP)

Pre-Bid MeetingDistrict 4

Oakland , CASeptember 14, 2012

Peter VacuraChief, Office of Asphalt Pavement

Division of Maintenance

OverviewRequired Use of RAP in LLP HMAMix Design Requirements for LLP HMA with RAPLLP HMA RAP SourceProcessed RAP RequirementsRAP Quality Control

Required Use of RAP in LLP HMA

You must use 25% RAP in HMA (25% RAP, Long Life)You may use up to 15% RAP in HMA (15% Max RAP, Long Life) The provisions in Section 4-1.035B, "Value Engineering Change Proposal," of the Standard Specifications do not apply to HMA (15% Max RAP, Long life) or HMA (25% RAP, Long Life).

Mix Design Requirements For LLP HMA With RAP

For the mix design of HMA (25% RAP, Long Life), perform Laboratory Procedures (LP-9) using 25% RAP, on combinations of aggregate gradations, RAP, and asphalt binder content.For the mix design of HMA (15% RAP, Long Life), perform Laboratory Procedures (LP-9) using 15% RAP.

LLP HMA RAP SourceYou may sample existing asphalt concrete from the project site by coring, milling, or grinding. RAP for HMA (25% RAP, Long Life) must come from the areas shown on the plans.

JMF Design: RAP– 25% +/- 1% at JMF Design, +/-3% during production– RAP fractionated into:

+ #4 Sieve- #4 Sieve

– Allowable stockpile variance, binder content: +/-2.0%– Sieve correction factors & binder content

Binder content* ASTM 2172 -----Grading RAP ---- CT 202

RAP Specification

JMF Design: RAP– Rice Specific Gravity AASHTO T209 CT309

Allowable stockpile variance Gmm= +/-0.060– Ignition oven* AASHTO T309 CT382

* Requires 3 samples

Specification Changes

Processed RAPProcessed RAP must be fractionated into two sizes, a coarse fraction (1/2 to 1 inch) and a fine fraction (<1/2 inch). Each processed RAP dedicated pile must be isolated from all other materials. Store RAP in conical stockpile. RAP must not be agglomerated or congeal in large piles.

39-1.04E Reclaimed Asphalt Pavement– Perform RAP quality control testing each day.– Sample RAP once daily and determine the

RAP aggregate gradation under Laboratory Procedure LP-9 and submit the results to the Engineer in writing with the combined aggregate gradation.

RAP Quality Control