823.02 General Requirements.
821.03 Specific 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. SECTION 822 DRAINAGE PLANE MATERIALS
822.01 General.
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 mo dified 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
823.01 Description.
Soil Aggregate for the purpose of these Specifications is classified according to the several kinds and general characteristics set forth in this Section.
823.02 General Requirements.
a.General . 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.
b.Clay Gravel . See Subarticle 820.02(d).
c.Clay Gravel -Sand. Clay grave l-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.
d.Chert . See Subarticle 820.02(c).
823.02 General Requirements.
e.Chert -Sand Mixture . 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.
f.Float Gravel . 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 arti ficial mixture.
g.Industrial Waste . 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.
h.Red Dog -Sand. 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.
i.Soft Sand Rock - Any Aggregate . Soft sand rock - any aggre gate 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.
j.Stone, Gravel and Slag 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, f loat gravel, or other natural soil- aggregate material.
k.Limerock . 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 magn esium) 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 a nd Coarse Aggregates."
824.02 General Requirements.
823.03 Specific Requirements.
GENERAL COMPOSITION Sieve Requirements Percentage Passing By Weight {Mass} TYPE A B C 2.5 inches {63 mm} 100 100 2 inches {50 mm} 100 85-100 85-100 1 inch {25.0 mm} 85-100 50-100 50-100 3/4 inch {19.0 mm} 35-95 No. 4 {4.75 mm} 50-85 30-75 25-58* No. 8 {2.36 mm} 35-75 25-70 22-50 No. 10 {2.00 mm} 30-74 22-69 20-49 No 40 {425 µm} 12-68 6-67 6-48 No. 200 {75 µm} 4-28 3-29 3-23 Clay 2-15 2-14 2-12 Liquid Limit (LL) 26 Max. 26 Max. 26 Max. Plasticity Index (PI) 6 Max. 6 Max. 6 Max. * Retained portion must contain a minimum of 25% crushed particles. 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 base will meet the above requirements. SECTION 824 PROCESSED REEF SHELL BASE MATERIALS
824.01 Description.
Processed Reef Shell Base for the purpose of these Specifications is classified as a com posite base course material which contains a large percentage of Processed Reef Shell blended with portions of Selected Soil, Granular Soil, Soil Aggregate, or other approved materials.
824.02 General Requirements.
Processed Reef Shell furnished for use sh all comply with the requirements of Article 827.02 and, when combined with other material, shall produce the material complying with the designated type noted in the specific requirements provided in Article 824.03. Gradation may be obtained by the proper blending of local or other commercial materials and approximately 40% of reef shell by weight {mass} for Type A and approximately 60% reef shell by weight {mass} for Type B. Special note is made of the fact that, should the gradation run on the extreme fin e or coarse side, difficulty can be expected in obtaining the modified proctor density.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 734–735 of 934.