placement. The selected fixed grading shall be within the following
limits, except any individual test result may be outside these limits
if within the allowable 3 percent variation from the selected grading.
U.S. STANDARD
PERMISSIBLE LIMITS
SIEVE DESIGNATION
PERCENT BY WEIGHT, PASSING
9.5-mm
(3/8-in.)
100
4.75-mm
(No. 4)
95
-
100
2.36-mm
(No. 8)
80
-
95
1.18-mm
(No. 16)
60
-
80
600-m
(No. 30)
35
-
60
300-m
(No. 50)
15
-
30
150-m
(No. 100)
5
-
10
[75-m
(No. 200)
0
-
5]
b. Coarse Aggregate - The coarse aggregate shall be rescreened just
prior to delivery to the concrete batch plant bins. The grading of the
coarse aggregate within the separate size groups shall conform to the
following requirements as delivered to the mixer.
PERCENT BY WEIGHT PASSING INDIVIDUAL SIEVES
4.75 to
19.0 mm to
[37.5 mm to [75 mm to
19.0 mm
37.5 mm
75 mm
150 mm
U.S. STANDARD
(No. 4 to
(3/4 inch to
(1-1/2 inch (3 inch to
SIEVE DESIGNATION
3/4 inch)
1-1/2 inch.)
to 3 inch)] 6 inch)]
175
mm
(7 inch)
100
150
mm
(6 inch)
90
- 100
100
mm
(4 inch)
100
20
- 55
75
mm
(3 inch)
90
-
100
0
- 15
50
mm
(2 inch)
100
20
-
55
0
-5
37.5
mm
(1-1/2 inch)
90
-
100
0
-
10
25.0
mm
(1 inch)
100
20
-
45
0
-
5
19.0
mm
(3/4 inch)
90
-
100
0
-
10
9.50
mm
(3/8 inch)
20
-
55
0
-
5
4.75
mm
(No. 4)
0
-
10
2.36
mm
(No. 8)
0
-
5
2.1.5.4
Particle Shape
The quantity of flat and elongated particles in the separate size groups of
coarse aggregate, as determined by ASTM D 4791, using a value of 3 for
width-thickness ratio and length-width ratio shall not exceed 25 percent in
any size group.
2.1.5.5
Moisture Content
The fine aggregate shall not be placed in bins at the batch plant until it
is in a stable state of moisture content. A stable moisture content shall
be reached when the variation in the percent of total moisture tested in
accordance with ASTM C 566 and when sampled at the same location will not
be more than 0.5 percent during 1 hour of the 2 hours prior to placing the
material in the batch plant bins and the variation in moisture content when
sampled at the same location shall not be more than 2.0 percent during the
last 8 hour period that the aggregate remains in the stockpile. The coarse
aggregate shall be delivered to the mixers with the least amount of free
SECTION 03700
Page 40
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