304 Aggregate Base

1. Specification:

Section 304.02, 304.04 C&MS.

2. Sampling and/or Inspection Requirements:

Refer to the Producer/Supplier Material in CMS to determine the status of the quality for the source to be used. (Field)

For gravel material, it must be established that the material was crushed from the material retained on the " screen. Crushing Certificate required (Field-District)

Document conformance with the crushing requirements in CMS that will represent the material. Furnish material conforming to 703.17 C&MS.

For each source not requiring submission to OMM for soundness or abrasion testing, a 70 lb. sample shall be obtained at the source as per Appendix "A", for each 2600 tons or fraction thereof. The sample shall be tested as per Section 3. (District)

An initial shale sample shall be submitted for deleterious determination for each project using Item 304, if shale is a specification requirement. There is no shale requirement for sand or slag. The sample shall consist of 5200 g. split from material retained on the No. 4 and larger screens.

Sources which are not Group 0 or 1 or are to be tested for quality (soundness, abrasion), require 2-70 lb. samples for each 5200 tons, or fraction thereof, to be obtained at the source as per Appendix "A". Refer to the Producer/Supplier Material in CMS to determine sources in this group. (Field-District)

Samples shall be thoroughly mixed to a uniform state by the District Laboratory before testing. One split, representing half of the sample, shall be submitted to the OMM Aggregate Section for quality testing, while the remainder shall be used by the District Laboratory for testing as per Section 3. When District testing is completed, update Responsible Location to "TL" and Lab to "AG" on CMS.

Samples requiring soundness shall also be tested for abrasion. The abrasion sample shall consist of a minimum of 1300 g each of material retained on the 3/8", ", 3/4" and 1" screens. This material, in a separate bag, shall accompany the soundness sample and shall have a completed TE-10 Shipping Tag marked "Abrasion Sample".

Samples shall be accompanied by a TE-31. The TE-31 will have the Sample ID of the sample tested by the District Engineer of Tests. If Group 0 or 1 materials are used on a project, they must be certified by the Contractor in accordance with 703.07 C&MS. (Field)

All open-hearth and basic-oxygen slag material shipped to a project must be accompanied by a delivery ticket with the stockpile number and/or location marked on it. Delivery tickets shall be checked against the list on file in the District Laboratory of those stockpiles meeting the aging requirement of 703.01 C&MS.

Density tests shall be run per S 1015.

Use Form C-135B for additional nuclear tests at locations where material is uniform and the maximum dry weight or test density has been determined on Form C-90. District Lab should get moisture density curve at the source and post for the field.

A moisture density curve is required in accordance with AASHTO T-99. A 100-lb. sample shall be submitted to the OMM Soils Section. Samples shall be accompanied by a properly completed TE-31.

3. Methods of Tests:

Physical Tests: (District Engineer of Tests)

S 1005, S 1006, S 1021 (Gravel only), S 1090

Samples being submitted for soundness testing shall be graded using sieves as called for in Appendix "B".

Quality Tests: (OMM)

S 1029, AASHTO T 88, T 89, T 90, T 96, T 99, T 104.

Moisture Density Control Tests: (Field)

Chapter 9 "MOP for Earthwork Construction" for the required moisture density tests and the procedures for constructing a test section per S-1015.