301, 302 Asphalt Concrete Base

1. Specifications and policies:

C&MS Section 301.02, 301.03, 302.02, 302.03, 403, Appendix J Sampling & Testing Manual

2. Sampling and/or Inspection Requirements:

Aggregate For 301:

The Contractor will submit a "blend letter" to OMM listing the aggregate source(s), the sizes and percentages of each size to be used, along with the amount passing the No. 4 sieve. Aggregate sources will be certified under S 1069. Following the receipt of the Contractor's blend letter, samples may be obtained and tested for all components of the blend in accordance with the procedures of 703.04.

Asphalt Concrete Base Using Recycled Asphalt Pavement (RAP):

In addition to the requirements of the "Blend Letter", the contractor will provide the gradation, the asphalt content and the source of the RAP. The contractor will also provide the viscosity of the asphalt binder contained in the RAP and controlled per section 401.04.

The District engineer of Tests will approve or reject the RAP.

A "blend" of the RAP and aggregate components shall be made in accordance with sampling and inspection requirements for aggregate for 301. A "Blending Index" must to be completed and submitted if more than 20% RAP is used. Aggregate soundness testing will be required for any RAP not coming from ODOT or OTC sources.

Aggregate For 302:

Aggregate properties for 302 shall be per 703.04

Monitoring and Acceptance:

Mix samples verifying contractor quality control tests taken and tested in accordance with 403 with minimum of two samples representing four production days.

Untested Material For ODOT Maintenance Purchase Orders:

If the procedures for premixed patching materials are followed, materials are sampled and approval obtained prior to delivery of mix. Refer to appropriate sections of this Manual for Procedures in handling individual components.

A TE-30 will be used for material assignment. Any testing will be work sheet only. For materials not being handled under the TE-59 procedure, a minimum of one sample is required for each purchase order or for each 500 tons. Only one sample is required for a single day's production in excess of 500 tons.

Increments shall be obtained from various locations in the truck by forcing a sampling tool into the mixture with the blade at right angles to the surface, leveling the tool blade, and lifting the increment out of the mass. The matrix adhering to the face of the sampling tool shall be included in the increment.

Increments shall be thoroughly mixed together on a clean surface and this composite pile shall then be placed in an 8" by 10" pan, or split by quartering into a quantity adequate to fill a 32-ounce can supplied by the Department.

Samples shall be submitted to the District engineer of Tests. TE-31 containing the following information shall accompany samples and Purchase Order samples:

A. JMF No.

B. Aggregate sizes (example: #8, #57)

C. Aggregate type (example: limestone, gravel, sand)

D. Mix design used (example: 4.9% AC, 48% P.4)

E. Aggregate source name, location (example: American Aggregates, Columbus)

3. Methods of Tests:

Supplement 1038, Supplement 1039, Supplement 1043.