821GRANULAR SOIL MATERIALS

690

Commercial aggregates shall meet the appropriate requirements of Sections 801 and 802.

Stone screenings shall consist of crushed stone fragments, all passing the No. 4 {4.75 mm} sieve with the fines down to and including dust, but not more than 30 percent by weight {mass}, passing the No. 100 {150 µm} sieve. The stone shall meet the general requirements of Section 801.

Pond ash shall consist of a combination of bottom ash and fly ash produced as a by-product of burning coal.

820.03Specific Requirements

General COMPOSITION Sieve Requirements Percentage Passing By Weight {Mass} TYPE A A-1 B B-1 C* 3 inch {75 mm} 100 100 100 100 100 No. 8 {2.36 mm} 60-100 42-100 22-75 20-70 20-50 No. 200 {75 µm} 7-45 5-45 3-38 3-46 3-35 Liquid Limit (LL) 28 Max. 35 Max. 28 Max. 35 Max. 45 Max. Plasticity Index (PI) 8 Max. 15 Max. 8 Max. 15 Max. 20 Max. * CBR of 40 + with swell of less than 5%

Material placed on the road found not meeting the above requirements may in lieu of removal and replacement be stabilized with approved materials in such proportions that the finished layer will meet the above specified requirements. GRANULAR SOIL MATERIALS

821.01Description

Granular Soil for the purpose of these Specifications shall be of the kind and general character of sand-clay, topsoil, sand, soft sand rock, etc., or combinations thereof meeting the requirements noted in this Section.

821.02General Requirements

The material shall meet the general requirements for the respective material noted in this Article and the specific requirements noted in Article 821.03. Reference is made to Subarticle 820.02(a) for definition of terms for coarse aggregate, binder, artificial mixture, and blends.

See Subarticle 820.02(b).

Topsoil base material shall consist of a natural material or artificial mixture, sometimes pebbly in character, that occurs in surface deposits of limited depth and in general on elevated areas.

Foundry sand shall be a waste material consisting of burned sand with or without slag fragments. In general, this material is waste or by-product material from foundry operations.

Soft sand rock shall be a friable natural material, generally sandy in character and occurring as a partially disintegrated sandstone with occasional hard strata, in sub surface formations of varying thickness and in general on elevated areas. Blasting is usually required to facilitate loading with power shovels. Pulverizing by use of rollers, tractors, or other equipment is usually necessary. DRAINAGE PLANE MATERIALS 691

See Subarticle 820.02(e).

821.03Specific Requirements

General COMPOSITION Sieve Requirements Percentage Passing By Weight {Mass} TYPE A B C 2 inch {50 mm} 100 100 100 No. 8 {2.36 mm} 20-100 20-100 20-100 No. 10 {2.00 mm} 19-100 18-99 18-95 No. 40 {425 µm} 10-100 8-95 6-65 No. 200 {75 µm} 2-45 2-40 2-35 Clay 2-18 1-18 1-16 Liquid Limit (LL) 25 Max. 25 Max. 25 Max. Plasticity Index (PI) 6 Max. 6 Max. 6 Max.

Material placed on the road found not meeting the above requirements may, in lieu of removal and replacement, be stabilized with approved materials in such proportions that the finished layer will meet the above specified requirements. DRAINAGE PLANE MATERIALS

822.01General

Drainage plane material shall, unless otherwise specified by plan details, be restricted to ALDOT Sizes 57, 67, 68 or 78 conforming to the requirements of Section 801 modified to require a minimum permeability of 50 mm/sec. as determined by the Constant Head Permeameter Test. Each material source will be pretested for permeability before shipments of material to the project are begun, and after approval no further permeability tests will be required provided there are no significant changes in the characteristics of the material noted; however, continuing gradation tests of the material will be made. SOIL AGGREGATE MATERIALS

823.01Description

Soil Aggregate for the purpose of these Specifications is classified according to the several kinds and general characteristics set forth in this Section.

823.02General Requirements

The material shall meet the general requirements noted in this Article and the specific requirements noted in Article 823.03. Reference is made to Subarticle 820.02(a) for definitions of terms, coarse aggregate, binder, artificial mixture and blends.

See Subarticle 820.02(d).

Clay gravel-sand shall meet the general requirements provided in Subarticle 823.02(b) for clay gravel, except that it is an artificial mixture composed of clay gravel and sand.

See Subarticle 820.02(c).