Spec_-_Class_II_base_rock.pdf

26 AGGREGATE BASES

26-1.01 GENERAL

26-1.01A Summary Section 26 includes specifications for placing aggregate base.

26-1.01B Definitions Reserved

26-1.01C Submittals Reserved

26-1.01D Quality Assurance 26-1.01D(1) General Reserved

26-1.01D(2) Quality Control Reserved

26-1.01D(3) Department Acceptance The Department accepts AB based on aggregate gradation, R-value requirements, and sand equivalent requirements specified in section 26-1.02.

The Department accepts AB based on percent relative compaction specified in section 26-1.03E tested under California Test 231.

Aggregate samples must not be treated with lime, cement, or chemicals before testing for durability index.

Aggregate from untreated reclaimed processed AC, PCC, LCB, or CTB is not considered treated.

If the aggregate gradation test results, sand equivalent test results, or both comply with the Contract compliance requirements but not the operating range requirements, you may continue placing AB for the remainder of the work day. Do not place additional AB until you demonstrate to the Engineer the AB to be placed complies with the operating range requirements.

If the aggregate gradation test results, sand equivalent test results, or both do not comply with Contract compliance requirements, remove the AB or request a payment deduction. If your request is authorized, $2.00/cu yd is deducted. If AB is paid by weight, the Engineer converts tons to cubic yards for the purpose of reducing payment for noncompliant AB left in place.

Each aggregate gradation and a sand equivalent test represents no more than 500 cu yd of AB or 1 day's production, whichever is smaller.

26-1.02 MATERIALS

26-1.02A General Aggregate must be clean and consist of any combination of the following:

1. Broken stone

2. Crushed gravel

3. Natural rough-surfaced gravel

4. Sand

5. Processed reclaimed asphalt concrete, PCC, LCB, or CTB

Use either 1-1/2-inch or 3/4-inch maximum aggregate gradation unless otherwise specified. Do not change your selected aggregate gradation without authorization.

26-1.02B Class 2 Aggregate Base Aggregate gradation must be within the percentage passing limits for the sieve sizes shown in the following table:

SECTION 26 AGGREGATE BASES

Aggregate Gradation

Sieve size Percentage passing

1-1/2 inch maximum 3/4 inch maximum Operating range Contract compliance Operating range Contract compliance

2" 100 100 -- -- 1-1/2" 90–100 87–100 -- -- 1" -- -- 100 100 3/4" 50–85 45–90 90–100 87–100 No. 4 25–45 20–50 35–60 30–65 No. 30 10–25 6–29 10–30 5–35 No. 200 2–9 0–12 2–9 0–12

The aggregate quality characteristics must comply with the requirements shown in the following table:

Aggregate Quality Characteristics

Quality characteristic Requirement

Operating range Contract compliance Resistance (R-value, min) -- 78 Sand equivalent (min) 25 22 Durability index (min) -- 35

26-1.02C Class 3 Aggregate Base Aggregate gradation must be within the percentage passing limits for the sieve sizes shown in the following table:

Aggregate Gradation

Sieve size Percentage passing

1-1/2 inch maximum 3/4 inch maximum Operating range Contract compliance Operating range Contract compliance

2" 100 100 -- -- 1-1/2" 90–100 87–100 -- -- 1" -- -- 100 100 3/4" 50–90 45–95 90–100 87–100 No. 4 25–60 20–65 40–70 35–75 No. 30 10–35 6–39 12–40 7–45 No. 200 3–15 0–19 3–15 0–19

The aggregate quality characteristics must comply with the requirements shown in the following table:

Aggregate Quality Characteristic

Quality characteristic Requirement Operating range Contract compliance

Resistance (R-value) (min) -- 50 Sand equivalent (min) 21 18

26-1.03 CONSTRUCTION

26-1.03A General Apply water to the AB as needed for compaction.

26-1.03B Subgrade Immediately before spreading AB, the subgrade must comply with the specified compaction and elevation tolerance for the material involved and be free from loose or extraneous material.