822DRAINAGE 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). SOIL AGGREGATE MATERIALS 692

Chert-sand shall meet the same general requirements provided in the Subarticle 820.02(c) for chert, except that it is an artificial mixture composed of chert and sand.

Float gravel shall be a varying stream deposit of worn and weathered coarse aggregate containing varying amounts of sand and soil. Oversized rock and boulders are frequently encountered and require reduction in size if used or elimination from the desired material. If provided by the plans, sand or binder soil shall be combined to provide for an artificial mixture.

Industrial waste shall be a mixture of foundry sand and fragments of slag or other materials of a durable nature. This is a waste material occurring as a result of processing iron and steel, and due to chemical actions therein, the stockpile must be approved by the Materials and Tests Engineer before it may be used.

Red Dog-sand is an artificial mixture of red dog and sand. Red dog (or red ash) is a burned waste material from mining or industrial operations, and in general is a fragmentary, tile-like material with varying amounts of binder and fines which will not be permitted unless specified on the plans or in the proposal.

Soft sand rock - any aggregate shall be an artificial mixture consisting of soft sand rock as defined by Subarticle 821.02(e) combined with (1) any aggregate or (2) other base materials which in general is predominantly coarse aggregate.

Stone, gravel, and slag aggregate shall meet the general requirements provided by Articles 801.03,

801.04, and 801.05 respectively. This classification is an artificial mixture of stone, gravel, or slag

aggregate and (1) binder soil, or (2) clay gravel, chert, float gravel, or other natural soil-aggregate material.

Limerock shall be crushed or processed as a part of the mining operations. Limerock shall not have chert or other deleterious substances. Limerock shall have a carbonate (calcium or magnesium) content of at least 90 %. At least 97 % (by weight) of the material shall pass a 3.5 inch sieve and the material shall be graded uniformly down to dust. The fine material shall consist entirely of dust of fracture. The liquid limit shall not exceed 35 and the crushed limerock material shall be non-plastic. Limerock shall have an LBR of at least 100 % according to ALDOT-427 "Procedure for Limerock Bearing Ratio." Producers of Limerock shall participate in ALDOT-249, "Procedure for Acceptance of Fine and Coarse Aggregates."