This document is part of Standard Specifications -- English Units.

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SECTION 1008

AGGREGATE BASE COURSE FOR STABILIZATION

1008-1 AGGREGATE STABILIZATION

(A) General:

All aggregates shall consist of crushed stone, crushed or uncrushed gravel, or other similar material having hard, strong, durable particles free of adherent coatings.

The Contractor may, at his option, furnish aggregates directly to the road or from a stockpile.

All aggregates shall be from approved sources in accordance with the provisions of Article 1005­1. Sources will not be approved unless the material has satisfactory soundness and satisfactory resistance to abrasion. Satisfactory soundness will be considered to be a loss in weight of not greater than 15 percent when subject to 5 alternations of the soundness test. Satisfactory resistance to abrasion will be considered to be a percentage of wear of not greater than 55 percent.

(B) Sampling and Acceptance:

Sampling for the determination of gradation, liquid limit, and plasticity index will be performed as provided in Subarticle 1008­1(D) and (E). Acceptance of the aggregate will also be based on the provisions of these subarticles.

(C) Testing:

Samples will be tested at a Department laboratory, except that where the Engineer has agreed to perform on site testing the Contractor shall make available a laboratory meeting the requirements of Article 520­7 and samples will be tested at the Contractor's laboratory.

(D) Sampling at the Road:

For sampling and acceptance purposes, a lot will be considered to be 1,000 tons or fraction thereof. For each lot of aggregate delivered to the project, 2 samples will be taken at random intervals. The gradation test results of these samples will be averaged and the average will be used to determine the acceptability of the lot.

It is the intent of these specifications that the gradation of the aggregate be the middle of the range shown in Column B of Table 1008­1. If, however, the average test results for a lot are within the limits shown in Column B of Table 1008­1, the gradation of the lot will be considered as acceptable.

TABLE 1008-1

AGGREGATE BASE COURSE FOR STABILIZATION

GRADATION ACCEPTANCE CRITERIA
Column A

Sieve Size
Column B

% Passing
l 1/2"
100
1"
75-97
1/2"
55-80
No. 4
35-55
No. 10
25-45
No. 40
14-30
No. 200
4-12
Material Passing No. 40 Sieve
L. L.
0-30
P. I.
0-6

When the average test results for a lot exceed any of the limits shown in Column B of Table 1008­1, the lot will be rejected. The rejected lot will be considered acceptable only after the Contractor has furnished and placed corrective material as directed by the Engineer, and remixed, recompacted, and reshaped the stabilized subgrade.

The liquid limit and plasticity index requirements for the material passing the No. 40 sieve shown in Table 1008­1 are for each individual sample. The results are not averaged and if any individual test result indicates a value exceeding these requirements the Engineer may reject the entire lot.

(E) Stockpile Sampling:

When approved by the Engineer, the aggregate may be sampled from a previously constructed stockpile. The number and frequency of samples will be determined by the Engineer. When the analysis of the stockpile indicates the aggregate is in conformance with the limits established by Column B of Table 1008­1, this material may be incorporated into the construction with no further sampling except that the Department reserves the right to inspect the aggregate after it has been placed on the road and to sample areas containing aggregate which appear to be outside the limits of Column B. If the results of these samples are not within the limits of Column B, the Contractor will be required to correct areas as deemed necessary by the Engineer in accordance with Subarticle 1008­1(D).