816Soil Aggregate Bases

816.1 General Description

This section includes the requirements for material to be used as soil aggregate base.

816.1.01 Related References

A. Standard Specifications Section 815–Graded Aggregate B. Referenced Documents AASHTO T 89 AASHTO T 90 GDT 4 GDT 6 GDT 7 GDT 13

816.2 Materials

816.2.01 Soil Aggregate

A. Requirements Type Use a soil aggregate base, subbase, or shoulder base course material that is of uniform quality. Material Retained on No. 10 (2 mm) sieve Ensure the material retained on the No. 10 (2 mm) sieve meets the requirements of Subsection 815.2.01.A. NOTE: You may substitute Group I graded aggregate base that meets the requirements of Subsection

815.2.01 A for soil aggregate base.

Gradation Ensure the soil aggregate base, subbase, or shoulder material meets the following gradation: Size Percent by Weight Passing 2 in. (50 mm) sieve 100 Passing 1-1/2 in. (37.5 mm) sieve 95-100 Passing 3/4 in. (19 mm) sieve 60-97 Passing No. 10 (2 mm) sieve 25-55 Material passing No. 10 (2 mm) sieve Passing No. 10 (2 mm) sieve 100 Passing No. 60 (250 µm) sieve 15-85 Passing No. 200 (75 µm) sieve (silt less clay) 3-25 Clay (8 minutes suspension on elutriation test) 10-25 a. Ensure that the material passing the No. 10 (2 mm) sieve has a total volume change of 15 or less. b. Ensure that the material passing the No. 40 (425 µm) sieve has a Liquid Limit (LL) of 25 or less and a Plasticity Index (PI) of 9 or less. B. Fabrication General Provisions 101 through 150. C. Acceptance Test as follows: Test Method Gradation GDT 4 and GDT 13 Volume change GDT 6 Liquid limit AASHTO T 89 Plastic limit and plasticity index AASHTO T 90 D. Materials Warranty General Provisions 101 through 150.

816.2.02 Soil Mortar for Soil Aggregate Base

A. Requirements Use a soil mortar for soil aggregate bases of friable materials meeting these requirements: Percent passing No. 200 (75 µm) sieve 0-65 Volume change 0-15 Maximum dry density 95 lb./ft.³ + (1520 kg/m³ +) B. Fabrication General Provisions 101 through 150. C. Acceptance Test as follows: Test Method Gradation GDT 4 Volume change GDT 6 Maximum dry density GDT 7 D. Materials Warranty General Provisions 101 through 150.