02640.10 1135 Section 02640 - Shoulder Aggregate Description
02640.00 Scope - This Section includes t he requirements for shoulder Aggregate .
Materials
02640.10 Aggregate :
a.Grading - Shoulder Aggregate shall be crushed Rock , including Sand. Sieve analysis shall be determined according to AASHTO T 27. Uniformly grade the Aggregates from coarse to fine. The Aggregates shall conform to one of the grading requirements of Table 02640- 1 as identified in the Special Provisions or indicated b y the Pay Item in the Contract Schedule of Items. Table 02640-1 Grading Requirements - Shoulder Aggregates Separated Sizes 1" - 0 3/4" - 0 Sieve Size Percent Passing (by Weight) 1 1/2" 100 1" 90 - 100 100 3/4" – 90 - 100 1/4" 40 - 55 40 - 60
b.Fracture of Rounded Rock - Fracture of rounded Rock shall be determined according to AASHTO T 335. Provide at least one fractured face based on the following percentage of particles retained on the 1/4 inch sieve for the designated size: Minimum Percent of Fractured Particles (by Weight of Material) Designated Size Retained on 1/4" Sieve 1 1/2" - 0 and larger 50 Smaller than 1 1/2" - 0 50
c.Durability - The produced Aggregate s shall meet the following requirements: Test Test Met hod Requirements Abrasion AASHTO T 96 35.0% maximum Degradation ( Coarse Aggregate) Passing No. 20 sieve ODOT TM 208 30.0% maximum Sediment Height ODOT TM 208 3.0" maximum
d.Sand Equivalent - Shoulder Aggregate shall be tested according to AASHTO T 176, and shall have a Sand equivalent of not less than 25.
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 1201–1201 of 1,268. View official source ↗