473ASPHALT SEAL COAT USING AGGREGATE FROM RAP

473.1DESCRIPTION—This work is an application of emulsified asphalt immediately followed by application

of seal coat aggregate made from RAP.

473.2MATERIAL—

:

Application Temperature (F) Class of Material Type of Material Minimum Maximum

RS-2P Polymer-Modified Emulsified Asphalt 140 175 CRS-2P Polymer-Modified Cationic Emulsified Asphalt 140 175 HFRS-2P Polymer-Modified High Float Emulsified Asphalt 140 175 RS-2 Emulsified Asphalt 140 175 CRS-2 Cationic Emulsified Asphalt 140 175 HFRS-2 High-Float Emulsified Asphalt 140 175

construction debris to meet the gradation requirements of Table A. Provide documentation certifying that the unprocessed RAP material was obtained from a source that required the use of only Bulletin 14 approved aggregates.

TABLE A Gradation Requirements of Seal Coat Aggregate from RAP Sieve Size % Passing by Weight* 12.5 mm (1/2 inch) 100 9.5 mm (3/8 inch) 85 – 100 4.75 mm (No. 4) 0 – 30 2.36 mm (No. 8) 0 – 15 1.18 mm (No. 16) 0 – 10 75 µm (No. 200)* 0 – 1 * Determined by PTM No. 100 (Material finer than 75 µm (#200) by wash)

The requirements of Section 703.2 do not apply to Seal Coat Aggregate from RAP.

additions:

2.a QC. Replace Section 703.5(b)1 with the following:

Section 106.03(b)2 and as follows:

• Submit for annual review a QC plan according to POM B.7.14 except the minimum testing frequency is as follows:

• During processing of the seal coat aggregate from RAP, sample and test the gradation of the finished seal coat aggregate from RAP the first day of production and a minimum of once every 1,000 tons of seal coat aggregate from RAP produced.

Before shipment, t he Representative will inspect the stockpile and truck loading of seal coat aggregate from RAP for clumps and oversized material. If clumps or oversized material retained on the 12.5 mm (1/2 inch) sieve are detected in the stockpile or during loading of vehicles, reprocess the seal coat aggregate from RAP to remove clumped or oversized material . Processed seal coat aggregate from RAP stored in uncovered stockpiles and not used within one month after production, or processed seal coat aggregate from RAP stored in covered stockpiles and not used within three months of processing must be reprocessed to remove clumps and oversized material retained on the 12.5 mm (1/2 inch) sieve.

2.b Source Verification Samples. Section 703.5(b)3. With the following addition:

Department force projects are not required to obtain project verification samples as required in Section 703.5(b)3.

473.3CONSTRUCTION—Section 470.3, with the following additions:

Placement of seal coat aggregate from RAP on routes over 1,000 ADT must be approved in writing by the District Executive. Provide documentation of the SRL of the unprocessed RAP material. All documentation must be signed by the DME/DMM certifying that the unprocessed RAP is from a Bulletin 14 approved source and is the SRL level indicated. Do not use seal coat aggregate from RAP on roads over 5,000 ADT.

Apply seal coat aggregate from RAP when the temperature of the existing roadway surface exposed to direct sun light is below 120F. If material starts to stick to the tires of reclaimed seal coat aggregate delivery trucks, stop seal coat placement operations until the existing roadway temperature is below 120F.

473.4MEASUREMENT AND PAYMENT—

The square yard unit price includes the production and placement of seal coat aggregate from RAP. The tonnage item only includes the seal coat aggregate from RAP.

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