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1010-1 AGGREGATE BASE COURSE--GENERAL

(A) General Requirements:

Aggregate base course material 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 aggregate base course material produced in accordance with the requirements indicated herein for either Type A or Type B aggregate unless otherwise specified in the special provisions.

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 weighted average loss of not greater than 15 percent when subjected 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) Testing:

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

1010-2 TYPE A AGGREGATE BASE COURSE.

Type A aggregate is aggregate upon which no restrictions are placed on production or stockpiling except as provided for in Section 1005.

For sampling and acceptance purposes, a lot will be considered to be 1,000 tons or a fraction thereof.

For each lot of aggregate placed on the road, 2 samples will be taken at random locations on the road prior to compaction. The gradation test results of these samples will be averaged. The average and the range of these samples will be used to determine the acceptability of the lot.

It is the intent of these specifications that the gradation of the aggregate be in the middle of the limits shown in Column B of Table 1010­1. If, however, the average gradation test results for a lot are within the limits shown in Column B of Table 1010­1 and the range between the test results does not exceed the requirements shown in Column C of Table 1010­1, the lot will be considered as acceptable.

The liquid limit and plasticity index requirements for the material passing the No. 40 sieve shown in Table 1010­1 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.

Lots not considered acceptable as provided above may be accepted at a reduced price or rejected and removed in accordance with the provisions of Subarticle 520­6(B).

a - This requirement will be applicable unless otherwise specified in the special provisions.

b - This requirement will be applicable only when specified in the special provisions.

1010-3 TYPE B AGGREGATE BASE COURSE.

(A) General:

Type B aggregate is aggregate from an approved stockpile which has been constructed, tested, and approved in accordance with the provisions of Subarticle 1010­3(B) and has subsequently been placed on the roadway, sampled, tested, and approved in accordance with the provisions of Subarticle 1010­3(C).

(B) Construction of Approved Stockpiles:

A stockpile sampling unit shall consist of approximately 2,000 tons of material in a layer approximately 2 feet in thickness which has been constructed in thoroughly mixed and spread sub-layers of approximately 8 inches in thickness. Equipment used for spreading and mixing sub-layers shall have been approved by the Engineer prior to use. The acceptance lot size shall be the entire stockpile, subject to the provisions of Subarticle 1010­3(C).

The material shall contain approximately optimum moisture when placed in the stockpile. When more than 2,000 tons of material is to be placed in a stockpile layer, the layers shall be divided into sections of approximately 2,000 tons and each section identified by properly maintained corner stakes as the work proceeds.

For each sampling unit, 2 random samples will be taken. The gradation test results of these samples will be averaged. The average of these samples will be used to determine the acceptability of the unit.

It is the intent of these specifications that the gradation of the aggregate be in the middle of the limits shown in Column B of Table 1010­1. If, however, the average test results for a unit are within the limits shown in Column B of Table 1010­1 the unit will be considered as acceptable.

The liquid limit and plasticity index requirements for the material passing the No. 40 sieve shown in Table 1010­1 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.

Where a unit is not acceptable, the unit shall be either removed from the stockpile or corrected by spreading the required amount of corrective material over the surface of the unit. Only one correction of a sampling unit will be permitted and correction will not be allowed when the amount of corrective material required exceeds 6 inches in depth in which case the unit will be rejected and shall be removed from the stockpile.

Sampling of a replaced unit will be performed in the same manner as original sampling. Resampling of a corrected unit will be done in accordance with procedures established by the Department. Copies of these procedures are available upon request from the Materials and Tests Unit.

It is the intent of these specifications that the average of all the individual dual unit gradation tests from a completed stockpile be in the middle of the limits shown in Column B of Table 1010­2. If, however, the average of all the individual unit gradation tests is within the limits shown in Column B of Table 1010­2, the completed stockpile will be considered acceptable subject to the provisions of Subarticle 1010­3(C). No material will be hauled from the stockpile until approval of the stockpile has been requested by the Contractor and granted by the Engineer. No additional material shall be placed on a stockpile which has been completed and approved.

The minimum height of an approved stockpile shall be approximately 10 feet, consisting of 5 layers approximately 2 feet in depth. The material shall be removed from the stockpile by loading from the bottom edge of the stockpile.

Stockpiles shall not overlap and proper identification shall be maintained on each stockpile at all times.

a - This requirement will be applicable unless otherwise specified in the special provisions.

b - This requirement will be applicable only when specified in the special provisions.

(C) Roadway Sampling:

For sampling and acceptance purposes, a lot shall consist of 20,000 tons of ABC material or a fraction thereof.

The sampling procedure shall consist of randomly selecting 1000 tons from the first 5000 tons of material placed, excluding the first 1000 tons, and taking 2 samples from the selected 1000 tons at random locations. The gradation test results of these 2 samples will be averaged and the average will be used to determine the acceptability of the lot.

The gradation indicated in Table 520­1, Column C, will be used for determining acceptance of ABC Type B material. When the average gradation test result falls within the limits of Column C, the entire 20,000 ton lot will be accepted.

When the average gradation test result falls outside the limits of Column C, the following steps shall be followed:

1. Additional sampling of the 5000 tons of material shall be done in order to isolate the unacceptable material. The procedure for this additional sampling shall consist of dividing the 5000 tons of material into two 2500 ton sub-lots and taking 2 samples at random locations in each of these sub-lots. The gradation results of the 2 samples will be averaged and this average will be used to determine the acceptance of each of these sub-lots.

When the average gradation test result for a sub-lot is within the limits shown in Column C of Table 520­1, the sub-lot will be considered acceptable.

When the average gradation test result for a sub-lot exceeds any of the limits shown in Column C of Table 520­1, and the sub-lot cannot be corrected by the addition of fine aggregate or when the average gradation test result for a corrected sub-lot exceeds any of the limits shown in Column B of Table 520­1, the sub-lot will be rejected and shall be removed and replaced by the Contractor at no cost to the Department unless otherwise approved by the Engineer. The replacement material shall meet the specifications for Type A aggregate or Type B aggregate depending upon the source of the material.

When the average gradation test result for a sub-lot exceeds any of the limits of the tolerances shown in Column C of Table 520­1 and the test result indicates the material can be corrected by the addition of fine aggregate, the Engineer may allow the material to be corrected provided there is no cost to the Department for the furnishing, adding, remixing, reshaping, and recompacting of the added material. When the average gradation test result of the corrected sub-lot is within the limits shown in Column B of Table 520­1, the sub-lot will be considered acceptable.

2. A new lot, comprising 20,000 tons of ABC or fraction thereof placed after the 5000 tons addressed in (1) above, shall be designated and the sampling procedure of Subarticle 1010­3(C) shall be followed.

In the event of the failures of 2 consecutive lots, the Department will withdraw its approval of the Type B ABC and the material will be sampled, tested, and accepted in accordance with the provisions of Subarticle 520­6(B), Type A aggregate.

1010-4 SOIL TYPE BASE COURSE.

Soil type base course consists of one or more natural materials proportioned and blended on the road, and shall be either Type A, B, or C. The type to be used shall be as specified in the special provisions.

Soil type base course shall meet the requirements of Table 1010­3 for the applicable type.

The base course material shall be free from vegetative matter and lumps or balls of clay.

Samples will be tested in accordance with Article 1005­4.

* The fraction passing the No. 200 sieve shall be less than 2/3 the fraction passing the No. 40 sieve.

1010-5 AGGREGATE FOR PLANT MIXED CEMENT TREATED BASE COURSE.

(A) General

Aggregate for plant mixed cement treated base course shall be aggregate from an approved source which has been tested and approved in accordance with the provisions of this article and the applicable provisions of Article 1010­1, except as may be modified by this article.

Sources of aggregate will not be approved unless the material has a percentage of wear of not greater than 65 percent.

The average gradation test results for a sampling unit or lot, as defined in Article 1010­5(B) or 1010­5(C) shall meet the requirement shown in Table 1010­4.

(B) Approved Stockpile Production

A stockpile sampling unit shall consist of approximately 2,000 tons of material in a layer approximately 2 feet in thickness which has been constructed in thoroughly mixed and spread sub-layers of approximately 8 inches in thickness. Equipment used for spreading and mixing sub-layers shall be approved by the Engineer prior to use. The acceptance lot size shall be the entire stockpile.

The material shall contain approximately optimum moisture when placed in the stockpile. When more than 2,000 tons of material is to be placed in a stockpile layer, the layers shall be divided into sections of approximately 2,000 tons and each section identified by properly maintained corner stakes as the work proceeds.

For each sampling unit, 2 random samples will be taken. The gradation test results of these samples will be averaged and the average will be used to determine the acceptability of the unit.

The average gradation test results from a sampling unit shall meet the requirements shown in Table 1010­4. Where a sampling unit is not acceptable, the unit shall be either removed from the stockpile or corrected by spreading material over the surface of the unit. Only one correction of a sampling unit will be permitted and correction will not be allowed when the amount of corrective material required exceeds 6 inches in depth in which case the unit will be rejected and shall be removed from the stockpile.

The liquid limit and plasticity index requirements for the material passing the No. 40 sieve shown in Table 1010­4 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.

Sampling of a replaced unit will be performed in the same manner as original sampling. Resampling of a corrected unit will be done in accordance with procedures established by the Department. Copies of these test procedures are available upon request from the Materials and Tests Unit.

The completed stockpile will be considered acceptable when all stockpile sampling units have been accepted. No additional material shall be placed on a stockpile which has been completed and approved.

The minimum height of an approved stockpile shall be approximately 10 feet, consisting of 5 layers approximately 2 feet in depth. The material shall be removed from the stockpile by loading from the bottom edge of the stockpile.

Stockpiles shall not overlap and proper identification shall be maintained on each stockpile at all times.

(C) Quarry production

For Sampling and acceptance purposes, a lot shall be considered to be 1000 tons or fraction thereof.

For each lot of cement treated base material produced, 2 samples will be taken at random intervals from the pug mill feeder belt. The gradation results from these samples will be averaged and the average will be used to determine the acceptability of the lot.

If the average gradation test results for the lot are within the limits established by Table 1010­4, the lot will be considered acceptable.

Lots not considered acceptable as provided above may be accepted at a reduced price or rejected and removed in accordance with the provisions of Subarticle 540­9(B).