Using the available aggregate stockpiles below (A, B, and C), determine the appr
ID: 1710142 • Letter: U
Question
Using the available aggregate stockpiles below (A, B, and C), determine the appropriate blending combinations to meet the gradation specifications. You may use a spreadsheet program, such as Excel, to design the appropriate proportions of the stockpiles (e.g. 80% A, 10% B, and 10% C). a) Summarize your blending percentages (A, B, and C) and final blended gradation values. b) Report your Nominal Maximum Aggregate Size (NMAS) and Maximum Aggregate Size (MAS) for your final blended gradation. c) Using the figure on the next page, plot your final blended gradation.Explanation / Answer
SL. NO.
US Sieve Size
Sieve Size (mm).
Percentage Passing
Percent Passing for blended Aggregate
(%)
Specification
Aggregate A
Aggregate B
Aggregate C
Ratio
0.55
0.40
0.05
= [0.55x(A)+0.4x(B)+0.05x(C)]
From
To
1
3/4"
19.0
100
100
100
100.00
100
100
2
1/2"
9.5
90
100
100
94.50
80
100
3
3/8"
12.7
59
100
100
77.45
70
90
4
No. 4
4.75
16
96
100
52.20
50
70
5
No. 8
2.36
3.2
82
100
39.56
35
50
6
No. 30
0.595
1.1
51
100
26.01
18
29
7
No. 50
0.297
0
36
98
19.30
13
23
8
No. 100
0.150
0
21
93
13.05
8
16
9
No. 200
0.075
0
9.2
82
7.78
4
10
Blending Percentages of Aggregate B = 40%
Blending Percentages of Aggregate C = 5%
SL. NO.
US Sieve Size
Sieve Size (mm).
Percent Passing for blended Aggregate
(%)
Specification
1
3/4"
19.0
100.00
100
100
2
1/2"
9.5
94.50
80
100
3
3/8"
12.7
77.45
70
90
4
No. 4
4.75
52.20
50
70
5
No. 8
2.36
39.56
35
50
6
No. 30
0.595
26.01
18
29
7
No. 50
0.297
19.30
13
23
8
No. 100
0.150
13.05
8
16
9
No. 200
0.075
7.78
4
10
SL. NO.
US Sieve Size
Sieve Size (mm).
Percentage Passing
Percent Passing for blended Aggregate
(%)
Specification
Aggregate A
Aggregate B
Aggregate C
Ratio
0.55
0.40
0.05
= [0.55x(A)+0.4x(B)+0.05x(C)]
From
To
1
3/4"
19.0
100
100
100
100.00
100
100
2
1/2"
9.5
90
100
100
94.50
80
100
3
3/8"
12.7
59
100
100
77.45
70
90
4
No. 4
4.75
16
96
100
52.20
50
70
5
No. 8
2.36
3.2
82
100
39.56
35
50
6
No. 30
0.595
1.1
51
100
26.01
18
29
7
No. 50
0.297
0
36
98
19.30
13
23
8
No. 100
0.150
0
21
93
13.05
8
16
9
No. 200
0.075
0
9.2
82
7.78
4
10
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