SECTION 02232 PAV 2008.doc

SECTION 02232

SELECT-MATERIAL SUBBASE COURSE

PART 1 GENERAL

1.1 SUMMARY (Not Applicable)

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM C 117 Materials Finer Than 75-um (No. 200)

Sieve in Mineral Aggregates by

Washing

ASTM C 136 Sieve Analysis of Fine and Coarse Aggregates

ASTM D 75 Sampling Aggregates

ASTM D 1556 Density of Soil In-Place by the Sand-Cone Method

ASTM D 1557 Moisture-Density Relations of Soils and Soil

Aggregate Mixtures Using 10©Lb. (4.54-kg) and Rammer and 18-In. (457-mm) Drop

ASTM D 2167 Density and Unit Weight of Soil

In-Place by the Rubber-Balloon Method

ASTM D 2922 Density of Soil and Soil-Aggregate

In-Place by Nuclear Methods (Shallow Depth)

ASTM D 3017 Moisture Content of Soil and

Soil-Aggregate In-Place by Nuclear Methods (Shallow

Depth)

ASTM D 4318 Liquid Limit, Plastic Limit and Plasticity Index of

Soils

ASTM E 11 Wire-Cloth Sieves for Testing Purposes

NEW JERSEY STATE HIGHWAY DEPARTMENT (NJSHD)

NJSHD Standard Specifications for Bridge and Highway Construction (Current Edition)

1.3 DEGREE OF COMPACTION

The degree of compaction required is expressed as a percentage of the maximum density obtained by the test procedure presented in ASTM D 1557, Method D. This will be abbreviated herein as percent of laboratory maximum density.

1.4 EQUIPMENT

All plant, equipment, and tools used in the performance of the work will be subject to approval before the work is started and shall be maintained in satisfactory working condition at all times. The equipment shall be adequate and have the capability of producing the required compaction, meeting grade controls, thickness control and smoothness requirements as set forth herein.

1.5 SAMPLING AND TESTING

Sampling and testing shall be the responsibility of the Contractor. Sampling and testing shall be performed by an approved commercial testing laboratory, or by the Contractor subject to approval. If the Contractor elects to establish testing facilities of his own, no work requiring testing will be permitted until the Contractor's facilities have been inspected and approved. The first inspection shall be at the expense of the Government and any subsequent inspections required because of failure of the first inspection will be at the expense of the Contractor. Such costs will be deducted from the total amount due the Contractor. The materials shall be tested to establish compliance with the specified requirements. Field density tests shall be performed on every "1000• square feet of completed sub-base; samples for laboratory testing shall also be taken from this same area. Copies of test results shall be furnished to the Contracting Officer.

1.5.1 Samples

Samples for laboratory testing shall be taken in conformance with ASTM D 75. The sampling may be observed by the Contracting Officer.

1.5.2 Tests

1.5.2.1 Sieve Analyses

Sieve analyses shall be made in conformance with ASTM C 117 and ASTM C 136. Sieves shall conform to ASTM E 11.

1.5.2.2 Liquid Limit and Plasticity Index

Liquid limit and plasticity index shall be determined in accordance with ASTM D 4318.

1.5.2.3 Density Tests

Density tests shall be measured in the field in accordance with ASTM D 1556.

1.5.3 Approval of Material

The source of the material shall be selected well in advance (at least 20 days prior) 0f the time the material will be required in the work. Tentative approval of the source will be based upon an inspection by the Contracting Officer's Representative. Tentative approval of material will be based on tests of samples for the specific job. Final approval of both the source and the materials will be based on tests for gradation, liquid limit, and plasticity index, performed on samples taken from the completed and compacted sub-base course.

1.6 WEATHER LIMITATION

Select-material sub-base courses shall be constructed when the atmospheric temperature is above 35 degrees F. When the temperature falls below 35 degrees F, the Contractor shall protect all areas of completed select-material sub-base course by approved methods against detrimental effects of freezing. Areas of completed select-material sub-base course damaged by freezing, rainfall, or other weather conditions shall be corrected to meet specified requirements.

PART 2 PRODUCTS

2.1 MATERIALS

Materials shall consist of selected soil or other materials from field excavation, stockpiles, or other sources. Material shall be free from lumps and balls of clay and from organic and other objectionable matter. Not more than 25 percent by weight shall pass the No. 200 sieve. The portion of material passing the No. 40 sieve shall have a liquid limit less than 35 and a plasticity index less than 12. The maximum particle size shall not exceed 3 inches.

PART 3 EXECUTION

3.1 OPERATION OF AGGREGATE SOURCES

All clearing, stripping, and excavating work involved in the opening or operation of aggregate sources shall be performed by the Contractor. Aggregate sources shall be opened to expose vertical faces of the deposit for suitable working depths. Materials excavated from aggregate sources shall be obtained in successive vertical cuts extending through all exposed strata. All pockets or strata of unsuitable materials overlying or occurring in the deposit shall be wasted as directed. The methods of operating aggregate sources may be changed or modified by the Contracting Officer when necessary in order to obtain material conforming to specified requirements. Upon completion of work, aggregate sources on Government reservations shall be conditioned to drain readily, and shall be left in a satisfactory condition. Aggregate sources on private lands shall be conditioned in agreement with local laws and approved by local authorities.

3.2 STOCKPILING MATERIAL

If necessary, materials shall be stockpiled in the manner and at locations designated. Prior to stockpiling, the storage sites shall be cleared, drained, and leveled by the Contractor. Approved material available from excavation or grading shall be stockpiled in the manner and at locations designated.

3.3 PREPARATION OF SUBGRADE

Prior to constructing the select-material sub-base course, the previously constructed sub-grade shall be cleaned of all foreign substances. The surface of the sub-grade shall meet specified compaction and surface tolerances. Sub-grade for select-material sub-base course shall conform to requirements of Section 02230 EXCAVATION, EMBANKMENT, AND PREPARATION OF SUBGRADE. Ruts or soft, yielding spots that may appear in sub-grade, areas having inadequate compaction, and deviations of the surface from requirements set forth herein shall be corrected by loosening and removing soft or unsatisfactory material, adding approved material, reshaping to line and grade, and re-compacting to specified density requirements.

3.4 GRADE CONTROL

The finished and completed sub-base course shall conform to lines, grades, cross sections, and dimensions shown. The lines and grades indicated shall be maintained by means of line and grade stakes placed by the Contractor at the work site.

3.5 MIXING AND PLACING MATERIALS

The materials shall be mixed and placed in such a manner as to obtain uniformity of the select sub-base material and at a uniform optimum water content for compaction. The Contractor shall make such adjustments in mixing or placing procedures or in equipment as may be directed to obtain the true grades, to minimize segregation and degradation, to reduce or accelerate loss or increase of water, and to insure a satisfactory select-material sub-base course.

3.6 LAYER THICKNESS

The compacted thickness of the select-material sub-base course shall be as indicated. When a compacted layer of 6 inches is specified, the material may be placed in a single layer; when a compacted thickness of more than 6 inches is required, no layer shall exceed 6 inches nor be less than 3 inches when compacted.

3.7 COMPACTION

Each layer of the select-material sub-base course shall be compacted with approved compaction equipment. Water content shall be maintained during the compaction procedure such that the water content is within plus or minus 5 percent of optimum water content as determined from laboratory tests as specified in paragraph "SAMPLING

AND TESTING." In all places not accessible to the rollers, the mixture shall be compacted with hand-operated power tampers. Compaction shall continue until each layer is compacted through the full depth to at least "95• percent of laboratory maximum density. The Contractor shall make such adjustments in compacting or finishing procedures as may be directed to obtain true grades, to minimize segregation and degradation, to reduce or increase water content, and to insure a satisfactory sub-base course. Any materials that are found to be unsatisfactory shall be removed and replaced with satisfactory material or reworked as directed to meet the specified requirements.

3.8 EDGES OF SUBBASE COURSE

Acceptable material shall be placed along the edges of the select-material sub-base course in such quantity as will compact to the thickness of the course being constructed. When the course is being constructed in two or more layers, at least a 1-foot width of the shoulder shall be rolled and compacted simultaneously with the rolling and compacting of each layer of the sub-base course, as directed.

3.9 SMOOTHNESS TEST

The surface of each layer shall not deviate more than 3/8-inch when tested with a 10-foot straightedge applied parallel with and at right angles to the centerline of the area to be paved. Deviations exceeding this amount shall be corrected by removing material, replacing with new material, or reworking existing material and compacting.

3.10 THICKNESS CONTROL

The thickness of the select-material sub-base course shall be measured at intervals providing at least one measurement for each 500 square yards or part thereof of sub-base course. The thickness measurement shall be made by test holes, at least 3 inches in diameter. The completed sub-base course shall not be more than 1/2-inch deficient in thickness nor more than 1/2-inch above or below the established grade. Where any of these tolerances are exceeded, the Contractor shall correct such areas by scarifying, adding new material of proper gradation or removing material, and compacting, as directed. Where the measured thickness of the sub-base course is 1/2-inch or more thicker than shown, the course will be considered as conforming with the specified thickness requirements plus 1/2-inch. The average job thickness shall be the average of the job measurements as specified above but within 1/4-inch of the thickness shown.

3.11 MAINTENANCE

The select-material course shall be maintained in a satisfactory condition until accepted.

3.12. METHOD OF MEASUREMENT AND PAYMENT: All measurements shall be units as identified in the appropriate SLINS in the Unit Price Schedule. Measurements for preparing payments shall be taken jointly with the Government Representative.

Payment for these items shall constitute full compensation for completed work including all labor and incidentals necessary to accomplish the work required by this section of the specifications.

END OF SECTION

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