A06_-_140L1722Q0019-02730_Agg_1.pdf

AGGREGATE SURFACING

Pumphouse ADA Improvements [05/22]

02730 - 1

SECTION 02730

PART 1: GENERAL

1.1 SUMMARY

A. Section Includes: This work shall consist of placing and compacting contractor furnished crushed aggregate surfacing material on a prepared surface and adjacent to the proposed concrete work.

PART 2: MATERIALS

2.1 GENERAL REQUIREMENTS

A. Imported Crushed Aggregate: Aggregate shall consist of hard, durable articles or fragments of stone or gravel, crushed to the size and of the quality requirements for crushed aggregate materials normally used locally in the construction and maintenance of highways by Federal or State agencies and shall be according to AASHTO M 147. The aggregates comply with Colorado Department of Transportation (CDOT) Class 6.

B. General: A materials compliance submittal verifying the aggregate meets CDOT Class 6 shall be supplied prior to placing any material.

Aggregate shall be supplied from a commercially operated sand and gravel supplier and shall meet the Class 6 requirements from existing stockpiled material. Mixing of additional material(s) by the contractor to bring out of specified material into compliance shall not be allowed. Weighing of material shall be performed by an employee of the sand and gravel supply company. Weight tickets shall include the company supplier name, ticket number, project name, gross weight, tare weight, net weight, and time and date at time(s) of weighing for each truck load of material. Tare weight(s) of trucks shall be required on every load of aggregate supplied.

PART 3: EXECUTION

3.1 CONSTRUCTION REQUIREMENTS

A. Preparation: Prior to placing aggregate surfacing material, the existing roadbed and areas adjacent to parking and walkways shall be bladed and shaped for placement of surfacing materials as approved by the Contracting Officer. Finished compacted grade of the aggregate surfacing shall be the finished grade of the concrete and blended into the existing slopes and grades of the adjacent road and parking areas, as approved by the Contracting Officer.

B. Placing: The material shall be placed on the prepared surface in a single layer and spread and compacted to an approximate 6” depth and as required for uniform grades into existing adjacent aggregate surfaces.

Pumphouse ADA Improvements [05/22]

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1. Placing shall be from vehicles equipped to distribute the material in a uniform layer or windrow. The layer or windrow shall be such size that when spread and compacted, the layer shall have the required thickness.

2. When hauling is done over previously placed material, hauling equipment shall be routed as uniformly as possible over the entire width of previously constructed layers.

C. Compacting: Immediately following final spreading and smoothing, each layer shall be compacted full width. Compaction shall be accomplished by means of a smooth drum vibratory roller compactor, minimum 48 inch drum width, and minimum 10,000 centrifugal force. A minimum of three passes shall be made over the entire width of the area, and until the material visible stops compacting. Apply water as necessary to obtain maximum compaction.

PART 4: MEASUREMENT AND PAYMENT

4.1 METHODS OF MEASUREMENT

A. Method: The quantity to be paid for will be the number of tons of aggregate surfacing material placed within the specified work area, compacted and accepted in the completed course. Costs associated with bedding material will be included in the bid prices of other bid items. Weighing of material shall be at Contractor's expense. A weight receipt for each load of material shall be furnished by the Contractor.

4.2 BASIS OF PAYMENT

A. General: Prices and payment will be full compensation for the work described in this section. Payment will be made under:

PAYMENT WILL BE MADE UNDER:

Pay Item Pay Unit

02730(1) Imported Aggregate Surfacing . . . . . . . . TON

END OF SECTION