Frequency of Quality Tests

The petrographic examination shall be used to

identify deleterious substances in aggregates.

Deleterious substances shall be listed individually

with respective limits.

Depending upon the quality of aggregates available,

some tests may not be required. Refer to EM

1110-2-2000 for the purpose of each test.

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a. Frequency of Quality Tests - Thirty days prior to the start of

preplaced-aggregate concrete placement the Contractor shall perform all

tests for aggregate quality listed on the following page. In addition,

after the start of concrete placement, the Contractor shall perform

tests for aggregate quality in accordance with the frequency schedule.

Samples of fine aggregate tested after the start of concrete placement

shall be taken immediately prior to entering the grout mixer. Samples

of coarse aggregate tested after the start of concrete placement shall

be taken immediately prior to entering the forms.

FREQUENCY

PROPERTY

FINE AGGREGATE

COARSE AGGREGATE

TEST

Specific Gravity

Every 3 months

ASTM C 127

ASTM C 128

Absorption

Every 3 months

ASTM C 127

ASTM C 128

[Durability Factor

Every 12 months

COE CRD-C 114

using, Procedure A

ASTM C 666/C 666M]

[Clay Lumps and

Every 3 months

ASTM C 142]

Friable Particles

[Material Finer

Every 3 months

ASTM C 117]

than the 75 m

(No. 200) Sieve

[Organic Impurities

Every 3 months

Not applicable

ASTM C 40

ASTM C 87)]

[L.A. Abrasion

Not applicable

Every 6 months

ASTM C 131

ASTM C 535]

[Soft and Friable

Not applicable

Every 6 months

COE CRD-C 130]

(Scratch Hardness)

[Petrographic

Every 6 months

ASTM C 295]

Examination

[Chert, less than

Every 6 months

ASTM C 123

2.40 specific

gravity]

[Coal and Lignite,

Every 6 months

ASTM C 123

less than 2.00

SECTION 03372

Page 32