825CRUSHED AGGREGATE BASE MATERIALS

694

824.03Specific Requirements

GENERAL COMPOSITION Sieve Requirements Percentage Passing By Weight {Mass} TYPE A B 2.5 inches {63 mm} 100 2 inches {50 mm} 100 85-100 1 inch {25.0 mm} 70-100 50-100 3/4 inch {19.0 mm} 40-95 No. 4 {4.75 mm} 25-65* No. 8 {2.36 mm} 40-70* 20-55 No. 10 {2.00 mm} 38-66 18-53 No 40 {425 µm} 5-52 No. 200 {75 µm} 4-28 2-22 Clay 10 Max. Liquid Limit (LL) 30 Max. 26 Max. Plasticity Index (PI) 10 Max. 6 Max. * NOTE: Retained portion must contain at least 75% shell particles. CRUSHED AGGREGATE BASE MATERIALS

825.01Description

Crushed Aggregate Base for the purpose of these Specifications shall consist of 100 percent crushed stone conforming to the requirements noted in this Section.

825.02General Requirements

The crushed stone furnished for use shall conform to the general requirements of Section 801 and the specific requirements noted in Article 825.03. Gradation analysis will be performed in accordance with AASHTO T 27. Gradation may be obtained by the proper mixing of certain regular ALDOT size aggregates as noted below; however, no specific gradation will be required prior to mixing operations. Type A - Approximately 75% ALDOT No. 610 with Approximately 25% ALDOT No. 8910. Type B - Approximately 50% ALDOT No. 410 with Approximately 50% ALDOT No. 810.

825.03Specific Requirements

GENERAL COMPOSITION Sieve Requirements Percentage Passing By Weight {Mass} TYPE A * B ** 2 inches {50 mm} 100 1.5 inches {37.5 mm} 90-100 1 inch {25.0 mm} 100 75-98 3/4 inch {19.0 mm} 86-100 - - - 1/2 inch {12.5 mm} - - - 55-80 No. 4 {4.75 mm} 26-55 40-70 No. 8 {2.36 mm} 15-41 28-54 No. 16 {1.18 mm} - - - 19-42 No. 50 {300 µm} 3-18 9-32 No. 200 {75 µm} 5-15 7-18 * The fraction passing the No. 40 {425 µm} sieve shall not have a liquid limit in excess of 25. ** The fraction passing the No. 40 {425 µm} sieve shall not have a P.I. in excess of 6 nor a L.L. in excess of 25, and contain not more than 2/3 by weight {mass} passing the No. 200 {75 µm} sieve.

LOCAL SAND AND SAND-GRAVEL FOR MISCELLANEOUS CONSTRUCTION USE 695

LOCAL SAND AND SAND-GRAVEL FOR MISCELLANEOUS CONSTRUCTION USE

826.01Description

Local materials, for the purpose of these Specifications, shall be of the kind and character of local sand and local sand-gravel or blends thereof.

826.02General Requirements

The kind of material shall meet the general requirements for the respective classification of material as noted in this Article. Blends shall consist of any combinations of local sand or sands, or local sand-gravel, or sand-gravels. All blends shall be of the material proportions or ratio provided by the plans and/or proposal. When used in bituminous pavements, local source material shall be non-plastic.

Local sand shall be pit-run sand suitable for the purpose intended. In general, all local sand shall consist of grains of hard, sound material, predominantly quartz or other hard, durable rock, including friable, loosely bound deposits of sandstone conglomerate. The sand shall be free from a coating of injurious material, lumps of clay, loam, organic matter, or other foreign material. If necessary, gradation and/or other requirements will be provided in the plans and/or proposal form.

Local sand-gravel shall be pit-run sand-gravel, suitable for the purpose intended. In general, the sand-gravel shall be hard, sound durable rock, including friable, loosely bound sandstone conglomerate, with varying amounts of coarse aggregate and sand. The coarse aggregate and the sand shall be free from a coating of injurious material, lumps of clay, loam, organic matter, or other foreign material. If necessary, gradation and/or other requirements will be provided in the plans and/or proposal form. PROCESSED REEF SHELL

827.01Description

Processed Reef Shell shall consist of dead reef shells (oyster, clam, or other dead shell as encountered in the reef) but not cannery or live shell. Processing shall consist of washing the shell by the use of a screen washer, the mesh of which shall not be smaller than 1/4 of an inch {7 mm}. The processed shell shall be classified as a commercial aggregate.

827.02Processed Shell For Soil Or Aggregate Base Courses

Processed shell used in base courses shall, after processing, not contain foreign matter in excess of three percent when washed over a No. 200 {75 µm} sieve of the dry weight {mass} of the shell.

827.03Processed Shell For Bituminous Bases and Pavements

Processed shell used in bituminous work shall in addition to the requirements noted in Articles

and 827.02 require the oversize fraction to be crushed in a mechanical crusher and rescreened