Tinker AFB, OK TAFB Technical Specifications 2019

April 2019 Page 1 Section 32 11 23

SECTION 32 11 23

AGGREGATE BASE COURSE

PART 1 GENERAL

1.1 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. Unless specifically noted, the current edition of the reference will be used.

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM C 29 Bulk Density ("Unit Weight") and Voids in

Aggregate

ASTM C 131 Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine

ASTM C 136 Sieve Analysis of Fine and Coarse

Aggregates

ASTM D 75 Sampling Aggregates

ASTM D 422 Particle-Size Analyses of Soils

ASTM D 698 Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/cu. ft. (600 kN-m/cu. m.))

ASTM D 2922 Density 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

OKLAHOMA DEPARTMENT OF TRANSPORTATION (ODOT)

ODOT SSHC Standard Specifications for Highway

Construction (SSHC)

1.2 SUBMITTALS

Government approval is required for all submittals. The following shall be submitted in accordance with SECTION 01 33 00 SUBMITTAL

PROCEDURES:

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SD-09 Reports

Sampling and Testing: Field Density Tests.

1.2.1 Submit calibration curves and related test results prior to using the device or equipment being calibrated.

1.2.2 Submit copies of field test results within 24 hours after the tests are performed.

1.2.3 Submit certified copies of test results for approval not less than 30 days before material is required for the work.

1.3 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. Copies of test results shall be furnished to the Contracting Officer. The Contractor shall notify the Contracting Officer of the source of materials selected for the project 14 days in advance of the time materials will be required in the work. Copies of test results shall be furnished to the Contracting Officer within 24 hours of completion of the tests.

1.3.1 Sampling

Aggregate samples for laboratory tests shall be taken in conformance with ASTM D 75.

1.3.2 Tests

The following tests shall be performed in conformance with the applicable standards listed.

1.3.2.1 Sieve Analysis

Before starting work, at least one sample of material to be stabilized shall be tested in accordance with ASTM C 136 and ASTM D 422 on sieves conforming to ASTM E 11. Results shall verify that the material complies with the specifications. After the initial test, a minimum of one analysis shall be performed for each 1000 tons of material placed, with a minimum of three analysis for each day's run until the course is completed. When the source of materials is changed or deficiencies are found, the initial analysis shall be repeated and the material already placed shall be retested to determine the extent of unacceptable material.

All in-place unacceptable material shall be replaced.

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1.3.2.2 Liquid Limit (LL) and Plasticity Index (PI)

One liquid limit and one plasticity index shall be determined for each sieve analysis. Liquid limit and plasticity index shall be determined in accordance with

ASTM D 4318.

1.3.2.3 Smoothness

Measurements for deviation from grade and cross section shown shall be taken in successive positions parallel to the road centerline with a 10-foot straightedge.

Measurements shall also be taken perpendicular to the road centerline at 50-foot intervals.

1.3.2.4 Thickness

Thickness of the stabilized course shall be measured at intervals in such a manner as to ensure one measurement for each 500 square yards of stabilized course. Measurements shall be made in 3-inch diameter test holes penetrating the stabilized course.

1.3.2.5 Field Density Tests

Field density tests shall be in accordance with ASTM D 2922. At least one field density test shall be performed for each 250 square yards of each layer of base material.

1.3.2.6 Wear Test

Wear tests shall be performed in accordance with ASTM C

131. One test shall be run per 1000 square yards of completed base course. A minimum of one test per aggregate source shall be run.

1.3.2.7 Weight of Slag

Weight per cubic foot of slag shall be determined in accordance with ASTM C 29.

1.3.2.8 Laboratory Density

Tests shall provide a moisture-density relationship for the stabilized-aggregate. Tests shall be conducted in accordance with ASTM D 698.

1.3.2.9 Approval of Material

Source of materials shall be selected well in advance of the time that materials will be required in the work. Test results from samples shall be submitted for approval not

April 2019 Page 4 Section 32 11 23 less than 30 calendar days before the material is required in the work.

1.4 WEATHER LIMITATIONS

Base shall be not be constructed when the atmospheric temperature is less than 35 degrees F. Base shall not be constructed on subgrades that are frozen or contain frost. If the temperature falls below 35 degrees F, completed areas shall be protected against any detrimental effects of freezing.

1.5 PLANT, EQUIPMENT, AND TOOLS

Equipment, plants, and tools used in the work shall be subject to approval and shall be maintained in satisfactory working condition.

PART 2 PRODUCTS

2.1 AGGREGATES

Aggregates shall consist of crushed stone or slag, crushed gravel, angular sand, or other approved materials. Aggregates shall be durable and sound, free from lumps of clay, organic matter, objectionable coatings, and other foreign materials.

Material retained on a No. 4 sieve shall be known as binder material.

2.1.1 Coarse Aggregate

Coarse aggregate, consisting of angular fragments of uniform density and quality, shall have a percentage of wear not to exceed 50 percent after 500 revolutions when tested in accordance with ASTM C 131. The amount of flat and elongated particles shall not exceed 30 percent. A flat particle is one having a ratio of width to thickness greater than 3, and an elongated particle is one having a ratio of length to width greater than 3. Only one type of coarse aggregate shall be used on the project and a notification stating which aggregate is to be used shall be submitted.

2.1.1.1 Crushed Gravel

Crushed gravel shall be manufactured from gravel particles 50 percent of which are retained, by weight, on the maximum size sieve specified.

2.1.1.2 Crushed Stone

Crushed stone retained on each sieve specified shall contain at least 50 percent by weight of crushed pieces having two or more freshly fractured faces with the area of

April 2019 Page 5 Section 32 11 23 each face being at least equal to 75 percent of the smallest mid-sectional area of the piece. When two fractures are adjacent, the angle between the planes of the fractures must be at least 30 degrees to count as two fractured faces.

2.1.1.3 Crushed Slag

Crushed slag shall be an air-cooled blast-furnace product having an air dry unit weight of not less than 65 pcf as determined by ASTM C 29.

2.1.2 Binder Material

Binder material shall consist of screenings, angular sand, or other finely divided mineral matter processed or naturally combined with the coarse aggregate. Liquid-limit and plasticity-index requirements shall apply to any component that is blended to meet the required gradation and shall also apply to the completed course. The portion of any component or of the completed course passing the No. 40 sieve shall be either non-plastic or have a liquid limit not greater than 25 and a plasticity index not greater than 5.

2.1.2.1 Material Passing No. 200 Sieve

The material passing the No. 200 sieve shall not be greater than two-thirds of the amount of material passing the No.

40 sieve.

2.1.3 Gradation Requirements

The specified gradation requirements shall apply to the completed base course. The aggregates shall have a maximum size of 1-1/2 inches and shall be continuously well graded within the limits specified in TABLE 1. Sieves shall conform to ASTM E 11.

TABLE I. GRADATION OF AGGREGATES

Sieve Percentage by Weight Designation Passing Square-Mesh Sieve

1-1/2 inch 100 3/4 inch 40-100 3/8 inch 30-75 No. 4 20-60 No. 10 20-43 No. 40 8-26 No. 200 4-12

NOTE 1: The table is based on aggregates of uniform specific gravity and the percentages passing the various sieves are

April 2019 Page 6 Section 32 11 23 subject to appropriate corrections by the Contracting Officer when aggregates of varying specific gravity are used. The gradation above conforms to Oklahoma State Highway Commission Standard Specification (OSHC CSS) for aggregate base, Section 703.01, Type A.

PART 3 EXECUTION

3.1 GENERAL REQUIREMENTS

When the base is constructed in more than one layer, the previously constructed layer shall be cleaned of loose and foreign matter with power sweepers or power brooms; except that hand brooms may be used in areas where power cleaning is not practical. Adequate drainage shall be provided during the entire period of construction to prevent water from collecting or standing on the area to be stabilized. Line and grade stakes shall be provided as necessary for control. Grade stakes shall be in lines parallel to the centerline of the area under construction and suitably spaced for string lining.

3.2 OPERATION OF AGGREGATE SOURCES

Aggregates shall be obtained from offsite sources

3.3 STOCKPILING MATERIALS

Materials, including approved material available from excavation and grading, shall be stockpiled in the manner and at locations designated. Before stockpiling of material, storage sites shall be cleared, drained, and leveled. Materials obtained from different sources shall be stockpiled separately.

3.4 PREPARATION OF UNDERLYING COURSE

Before constructing stabilized-aggregate base course, the previously constructed underlying course shall be cleaned of foreign substances. Surface of underlying course shall meet the specified compaction and surface tolerances. Sub grade shall conform to SECTION 31 00 01: EARTHWORK. Ruts or soft, yielding spots that may appear in the underlying course, areas having inadequate compaction, and deviations of the surface from requirements specified shall be corrected. Finished underlying course shall not be disturbed by traffic or other operations and shall be maintained in a satisfactory condition until base course is placed.

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3.5 INSTALLATION

3.5.1 Mixing and Placing

Materials shall be mixed by the stationary-plant, traveling-plant, or road-mix method and placed in such manner as to obtain uniformity of the stabilized-aggregate base course material and at such adjustments in mixing or placing procedures or in equipment to obtain the true grades to minimize segregation and degradation, to reduce or accelerate loss or increase of water, and to insure a satisfactory base course

3.5.2 Edges of Base Course

Approved material shall be placed along edges of stabilized-aggregate base course in such quantities as will compact to thickness of the course being constructed, or to the thickness of each layer in a multiple-layer course, allowing in each operation at least a 1-foot width of the shoulder to be rolled and compacted simultaneously with rolling and compacting of each layer of base course

3.5.3 Compaction

Each layer of stabilized-aggregate base course shall be compacted. Water content shall be maintained at optimum. Density of compacted mixture shall be at least 95 percent of standard proctor density. Rolling shall begin at the outside edge of the surface and proceed to the center, overlapping on successive trips at least one-half the width of the roller. Alternate trips of the roller shall be slightly different lengths. Speed of the roller shall be such that displacement of the aggregate does not occur. Areas inaccessible to the rollers shall be compacted with mechanical tampers, and shall be shaped and finished by hand methods.

3.5.4 Thickness

Compacted thickness of the stabilized course shall be as indicated. No layer shall be in excess of 8 inches nor less than 3 inches in compacted thickness.

3.5.5 Edges of Base Course

Approved material shall be placed along edges of stabilized-aggregate base course in such quantities as will compact to thickness of the course being constructed, or to the thickness of each layer in a multiple-layer course, allowing in each operation at least a 1-foot width of the shoulder to be rolled and compacted simultaneously with rolling and compacting of each layer of base course.

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3.5.6 Finishing

The surface of the top layer shall be finished to grade and cross section shown. Finished surface shall be of uniform texture.

Light blading during compaction may be necessary for the finished surface to conform to the lines, grades, and cross sections.

Should the surface for any reason become rough, corrugated, uneven in texture, or traffic marked prior to completion, such unsatisfactory portion shall be scarified, reworked, recompacted, or replaced as directed.

3.5.7 Smoothness

Surface of each layer shall show no deviations in excess of 3/8 inch when tested with the 10-foot straightedge. Deviations exceeding this amount shall be corrected by removing material and replacing with new material, or by reworking existing material and compacting as directed.

3.5.8 Thickness Control

Compacted thickness of the stabilized base course shall be within 1/2 inch of the thickness indicated. Where the measured thickness is more than 1/2 inch deficient, such areas shall be corrected by scarifying, adding new material of proper gradation, re-blading, and re-compacting as directed. Where the measured thickness is more than 1/2 inch thicker than indicated, the course shall be considered as conforming to the specified thickness requirements.

Average job thickness shall be the average of all thickness measurements taken for the job, but shall be within 1/4 inch of the thickness indicated.

3.6 TRAFFIC

Completed portions of the area may be opened to traffic, provided there is no marring or distorting of the surface by the traffic.

Heavy equipment shall not be permitted except when necessary for construction, and then the area shall be protected against marring or damage to the completed work.

3.7 MAINTENANCE

The stabilized-aggregate base course shall be maintained in a satisfactory condition until accepted. Maintenance shall include immediate repairs to any defects and shall be repeated as often as necessary to keep the area intact.

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3.8 DISPOSAL OF UNSATISFACTORY MATERIALS

Removed in-place materials that are unsuitable for stabilization, material that is removed for the required correction of defective areas, waste material, and debris shall be disposed of as directed.

- End of Section -

1.3.2.9 Approval of Material

2.1.3 Gradation Requirements