1003.1 Scope. This specification covers aggregate to be used for seal coat.
1003.2 Aggregate. Aggregate for seal coats shall consist of sound durable rock particles, free from
objectionable coatings.
1003.2.1 When tested in accordance with AASHTO T 96, the percentage of wear shall not exceed 50 percent.
The sum of the percentages of all deleterious substances shall not exceed 2.0 percent for Grade A aggregate, 4.0 percent for Grade B or 8.0 percent for Grade C aggregate, and the aggregate shall meet the following criteria: Property Grade A1 & A2 Aggregate Grade B1 & B2 Aggregate Grade C Aggregate Deleterious rock, percent by weight, max 2.0 4.0 8.0 Shale, percent by weight, max 0.5 0.75 1.0 Other foreign material, percent by weight, max 0.5 0.5 0.5 Two fractured faces, percent, min 100 100 100 Thin, elongated particles, ASTM D 4791, 5:1, percent, maxa 10 N/A N/A Micro-Deval, AASHTO T 327, percent, max 18 20 N/A aTest material retained on the No. 4 sieve.
1003.2.2 The aggregate shall be in accordance with the following requirements for the grade specified in the
contract: Sieve Size Grade A1 Aggregate Grade A2 Aggregate Grade B1 Aggregate Grade B2 Aggregate Grade C Aggregate Percent Passing by Weight Percent Passing by Weight Percent Passing by Weight Percent Passing by Weight Percent Passing by Weight 1/2" 100 100 100 100 100 3/8" 97-100 100 95-100 100 95-100 1/4" -- 97-100 -- 95-100 -- No. 4 0-25 -- 0-30 -- 0-35 No. 8 -- 0-30 -- 0-30 -- No. 200a, b 0-1.0 0-1.5 0-2 0-2.5 0-2 aThe percent passing the No. 200 sieve may be increased by 1.0 percent provided the aggregate is pre-coated with bituminous material. bThese values may be raised by 0.5% at the destination to account for handling provided the material meets this gradation at the source.
1003.2.3 Crushed stone shall be obtained from rock of uniform quality. Rock from individual ledges and gravel
tested for initial source approval shall meet the following criteria: Property Grade A1 & A2 Aggregate Grade B1 & B2 Aggregate Grade C Aggregate Absorption, AASHTO T 85, percent, max 2.0 4.0 4.0
1003.2.4 Lightweight aggregate shall be in accordance with the following requirements for the grade specified
in the contract: Property Grade A1 & A2 Aggregate Grade B1 & B2 Aggregate Grade C Aggregate Absorption, ASSHTO T 85, percent, max n/a n/a n/a Los Angeles Abrasion for Lightweight Aggregate, MoDOT Test Method TM 78, percent, max 50 50 50
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