Section 302 — Crushed Aggregate

Description

302.01This work consists of providing and placing crushed aggregate.

Material

302.02Conform to the following Subsections: Crushed aggregate 703.06 Water for construction 725.01(c)

Construction Requirements

302.03Preparing Surface.

(a)Roadway aggregate. Prepare the surface according to Section 204 or 303 as applicable.

(b)Bedding and ba ckfill aggregate. Shape, compact, and finish the surface to the required line, grade, elevation, and cross- section according to Section 209.

(c)Shoulder finishing aggregate. Remove slide material, vegetation, and other debris from existing shoulders including shoulders in parking areas, turnouts, and other widened areas. Repair soft and unstable areas according to Subsection 204.07. Reshape shoulders to the widths and slopes shown in the plans. Dispose of waste at designated sites or according to Subsection 204.14.

302.04Mixing and Spreading.

(a)Roadway aggregate. Mix the aggregate and adjust the moistu re content to obtain a uniform mixture. Adjust the moisture content to obtain proper compaction. Spread and shape in uniform lifts no more than 6 inches compacted thickness. If more than one lift is necessary, compact each lift according to Subsection 302.05(a) before placing the next lift.

(b)Bedding and backfill aggregate. Spread and shape in uniform lifts no more than 6 inches compacted thickness. If more than one lift is necessary, compact each lift according to Subsection 302.05(b) before placing the next lift.

(c)Shoulder finishing aggregate. Mix the aggregate and adjust the moisture content to obtain a uniform mixture. Adjust the moisture content to obtain proper compaction. Spread and shape in uniform lifts no more than 6 inches compacted thickness.

302.05Compacting and Finishing Crushed Aggregate.

(a)Roadway aggregate. If no compaction method is specified, use either method. Finish the surface according to Subsection 301.06.

(1)Method 1. Compact each lift according to Subsection 204.11(a) . Roll from the sides to the center, parallel to the centerline of the road. Compact the material along curbs, headers, walls, and places not accessible to a roller with approved tampers or compactors. Compactive effort may be decreased if in -place densities show that less compactive effort is required under Method 2.

(2)Method 2. Compact each lift according to Subsection 301.05.

(b)Bedding and backfill aggregate. Compact each lift according to Subsection 209.10.

(c)Shoulder finishing aggregate. Uniformly compact each lift to ensure it does not exhibit heaving, pumping, rutting, or shearing. Finish surface according to Subsection 301.06.

302.06Acceptance. See Table 302-1 for sampling, testing, and acceptance requirements. Crushed aggregate will be evaluated under Subsections 106.02 and 106.03. Submit a production certification including gradation and quality properties for each source. Construction of crushed aggregate will be evaluated under Subsections 106.02 and 106.04.

Measurement

302.07Measure the Section 302 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable: When measuring crushed aggregate by the cubic yard, measure in place. When measuring crushed aggregate by the square yard, measure the length horizontally along the centerline of the roadway. Measure the width horizontally to include the top of aggregate width, including designed widenings.

Payment

302.08The accepted quantities will be paid at the contract price per unit of measurement for the Section 302 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 . Table 302-1 Sampling, Testing, and Acceptance Requirements

Material

or

Product Type of

Acceptance

(Subsection) Characteristic Category Test Methods

Specifications Sampling

Frequency Point of

Sampling Split

Sample Reporting

Time Remarks

Production

Crushed

aggregate Measured & tested for conformance (106.04 ) Moisture - density − AASHTO T 180, Method D(1) 1 per aggregate supplied Production output or stockpile Yes 4 hours Not required for shoulder finishing Gradation(2) − AASHTO T 11 & T 27 1 per 500 tons From the windrow or roadbed after processing. " Before placing next lift For Method 2 compactio n only Density − AASHTO T 310 or other approved procedures 1 per 500 tons In-place after compaction

No End of

shift "

Crushed

aggregate Process control (153.03 ) Moisture content (in-place) − AASHTO T 310 or other approved procedures 1 per 500 tons In-place after compaction No End of shift Not required for shoulder finishing

Finished Product

Crushed

aggregate Measured & tested for conformance (106.04 ) Surface tolerance & grade − Subsection

301.06As directed Surface of final course No Before placement of next lift or as requested −

(1)At least 5 points per proctor.

(2)Sampling and testing only required for roadway aggregate. Conform to the approved certification.