02630.10 1133 Section 02630 - Base Aggregate Description
02630.00 Scope - This Section includes the requirements for Aggregate s in Base .
Materials
02630.10 Dense-Graded Aggregate:
a.Grading - Dense-graded base Aggregate shall be crushed Rock , including Sand. Uniformly grade the Aggregate s from coarse to fine. Sieve analysis shall be determined according to AASHTO T 27. The Aggregates shall conform to one of the grading requirements of Table 02630-1 as identified in the Special Provisions or indicated by the Pay Item s in the Contract Schedule of Items. Table 02630-1 Grading Requirements for Dense -Graded Aggregate Separated Sizes Sieve Size 2 1/2" - 0 2" - 0 1 1/2" - 0 1" - 0 3/4" - 0 Percent Passing (by Weight) 3" 100 2 1/2" 95 - 100 100 2" – 95 - 100 100 1 1/2" – – 95 - 100 100 1 1/4" 55 - 75 – – – 1" – 55 - 75 – 90 - 100 100 3/4" – – 55 - 75 – 90 - 100 1/2" – – – 55 - 75 – 3/8" – – – – 55 - 75 1/4" 30 - 45 30 - 45 35 - 50 40 - 55 40 - 60 No. 4 1 – – – – – No. 10 2 2 2 2 2 1 Report percent passing sieve when no grading requirements are listed 2 Of the fraction passing the 1/4 inch sieve, 40 percent to 60 percent shall pass the No. 10 sieve
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 inch Sieve 1 1/2" - 0 and larger 50 Smaller than 1 1/2" - 0 70 02630.11 1134 (c) Durability - Dense -graded Aggregate shall meet the following durability requirements: Test Test Method 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 - Dense-graded Aggregate shall be tested according to AASHTO T 176, and shall have a Sand equivalent of not less than 30.
02630.11 Open -Graded Aggregate:
a.Grading - Open -graded Aggregate shall conform to the following grading requirements: Table 02630-2 Aggregate Gradation for Open -Graded Aggregate Percent Passing Sieve Size (by Weight) 1" 100 3/4" 80 - 98 1/2" 60 - 85 3/8" 30 - 65 No. 10 5 - 20 No. 40 0 - 6 No. 100 0 - 3 (Dry Sieve)
b.Fracture of Rounded Rock - Fracture of rounded Rock shall be determined according to AASHTO T 335. Open-graded Aggregate fracture requirements shall conform to the following: Percentage of Fracture (by Weight) Material Retained on 3/4", 1/2", and 1/4" Sieves (two fractured faces) ........... 90 Material Retained on No. 10 Sieve (one fractured face) ................................. 75
c.Durability - Open -graded Aggregate shall meet the durability requirements of 02630.10(c).
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Source: Oregon Standard Specifications for Construction, 2024 Edition. Pages 1199–1200 of 1,268. View official source ↗