TEST LIMITS
PROPERTY
FINE AGGREGATE
COARSE AGGREGATE
TESTS
2.1.4.3
Grading
**************************************************************************
NOTE: See DM for appropriate fine aggregate options.
**************************************************************************
a. Fine Aggregate - The grading of the fine aggregate as delivered to
the mixer for the RCC shall be such that the individual percent
retained on any sieve shall not vary more than 3 percent from the
percent retained on that sieve in a fixed grading selected by the
Contractor after the first 30 days of concrete placement. The minimum
percent retained on each of the 2.36 mm No. 8 through 75 m No. 200
sieve sizes shall be 5 percent. In additional to the grading limits,
the fine aggregate, as delivered to the mixer, shall have a fineness
modulus of not less than 2.10 nor more than 2.75. The grading of the
fine aggregate shall also be controlled so that the fineness moduli for
at least four of five consecutive test samples of the fine aggregate as
delivered to the mixer shall not vary more than 0.10 from the fineness
modulus of the fixed grading selected by the Contractor, and approved.
The fineness modulus shall be determined in accordance with COE CRD-C
104. At the option of the Contractor, fine aggregate may be separated
into two or more sizes or classifications, but the uniformity of the
grading of the separate sizes shall be controlled so that they may be
combined throughout the job in fixed proportions established during the
first 30 days of RCC placement. The grading of the fine aggregate for
the bedding concrete and all other conventional concrete shall conform
to the requirements of [ASTM C 33]. [Section [03300A CAST-IN-PLACE
STRUCTURAL CONCRETE] [03300N CAST-IN-PLACE CONCRETE]] The fixed
grading and the results of individual tests during the first 30 days
shall fall within the following limits:
SIEVE DESIGNATION
PERMISSIBLE LIMITS
U.S. STANDARD SQUARE MESH
PERCENT BY MASS, PASSING
9.5 mm (3/8 in.)
100
4.75 mm (No. 4)
95 - 100
2.36 mm (No. 8)
75 - 95
1.18 mm (No. 16)
55 - 80
600 m (No. 30)
35 - 60
300 m (No. 50)
24 - 40
150 m (No. 100)
12 - 28
75 m (No. 200)
*8 - 18
__________________________________________________________________
Note: * The Contractor, at no additional cost to the Government, may
substitute the required fines smaller than the 75 m No. 200 sieve size with
Class F fly ash.
b. Coarse Aggregate - The grading of the coarse aggregate within the
separate size groups shall conform to the following requirements as
delivered to the mixer.
SECTION 03701
Page 26
Previous Page
