301AGGREGATE BASE

301.01Description

This work shall consist of placing coarse aggregate on a prepared grade in accordance with 105.03.

MATERIALS

301.02Materials

Materials shall be in acco rdance with the following: 10

Coarse Aggregate, Class D or Higher.......................... 904.03

ACBF shall not be used for subgrade treatment Type ID, Type IV, and Type IVA.

CONSTRUCTION REQUIREMENTS

301.03Preparation of Subgrade

Subgrade shall be prepared in accordance with 207.04. Proofrolling will not be 20 required in trench sections and other areas where proofrolling equipment cannot be used.

301.04Temperature Limitations

Aggregate shall not be placed when th e air temperature is less than 35°F. Aggregate shall not be placed on a frozen subgrade. Frozen aggregate shall not be placed.

301.05Spreading

The moisture content of the aggregate shall be between 4% and the optimum 30 moisture content when the aggregate is de livered to the project. Unless otherwise directed, water shall not be added to the aggregate on the grade.

Aggregate shall be spread in uniform lifts with a spreading and leveling device approved by the Engineer. The spreading and leveling device shall be capable of placing aggregate to the depth, width, and slope specified. The compacted depth of each lift shall be a minimum of 3 in. and a maximum of 6 in.

Aggregate shall be handled and transported to minimize segregation and the loss of moisture. In areas inaccessible to mechanical equipment, each lift shall be 3 in. and 40 an approved hand spreading method may be used.

301.05

301.06Compacting

Dense graded aggregate shall be comp acted to achieve th e allowable average deflection as determined with LWD testing in accordance with 203.24(b).

The allowable average deflection for aggr egate over the chemically modified soils and untreated soils shall be in accordance with the Tables shown in 203.24(b).

As an alternate, aggregates shall be compacted to a minimum of 100% of the 50 maximum dry densities in accordance with AASHTO T 99. In situ density will be determined in accordance with 203.24(b) . Aggregate shall meet the compaction requirements at the time subsequent courses are placed.

Coarse graded aggregates shall be compacted in accordance with 203.25.

In areas inaccessible to compaction equipm ent, such as private drives and mailbox approaches, the compaction requirements may be accepted by visual inspection.

All displacement or rutting of the aggregate shall be repaired prior to placing 60 subsequent material.

301.07Checking and Correcting Base

The top of each aggregate course shall be checked transver sely to the cross- section and all deviations in excess of 1/2 in. shall be corrected. If additional aggregate is required, the course shall be remixed and re-compacted.

301.08Priming

A prime coat, when required, shall be in accordance with 405.

301.09Method of Measurement

Compacted aggregate base will be measured by the cubic yard based on the theoretical volume to the neat line as shown on the plans. Geotextiles will be measured in accordance with 616.12.

301.10Basis of Payment

The accepted quantities of compacted aggregate base will be paid for at the contract unit price per cubic yard, complete in place. Geotextiles will be paid for in accordance with 616.13.

Payment will be made under:

Pay Item Pay Unit Symbol

Compacted Aggregate, No. 2 .................................................... CYS Compacted Aggregate, No. 5 .................................................... CYS Compacted Aggregate, No. 8 .................................................... CYS Compacted Aggregate, No. 53 .................................................. CYS 301.06

The cost of placing, compacting, water, aggregate placed outside neat lines as 90 shown on the plans, and necessary incidentals shall be included in the cost of the pay item.

Payment will not be made for material placed outside of a 1:1 slope from the planned typical section.

Replacement of pavement damaged by the Contractor’s operations shall be at no additional payment.