Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 5.42QP
A contractor is considering using three stockpiles for a Superpave mix design that requires evaluation of three different blend percentages. Determine the blended specific gravity for the three blends shown in Table P5.42.
TABLE P5.42
| Material | Gsb | Stockpile 1 | Stockpile 2 | Stockpile 3 |
| Crashed limestone | 2.702 | 45% | 55% | 50% |
| Blast furnace slag | 2.331 | 35% | 20% | 30% |
| Sand | 2.609 | 20% | 25% | 20% |
What is the bulk specific gravity of the blended aggregates?
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Students have asked these similar questions
Table P5.27 shows the grain size distributions of aggregates A, B, and C. The
three aggregates must be blended at a ratio of 15:25:60 by weight, respectively.
Using a spreadsheet program, determine the grain size distribution of the blend.
TABLE P5.27
Percent Passing
Sieve Size, mm
25
19
12.5
9.5
4.75
1.18
0.60
0.30
0.15
Aggregate A
100
100
100
77
70
42
34
28
20
Aggregate B
100
85
62
43
24
13
Aggregate C
100
100
84
51
29
19
18
14
9.
A portland cement concrete mix requires mixing sand having a gradation following the midpoint of the ASTM gradation band and gravel having a gradation following the midpoint of size number 467 of the ASTM gradation band at a ratio of 2:3 by weight. On a 0.45 power gradation chart, plot the gradations of the sand, gravel, and the blend. Is the gradation of the blend well graded? If not, what would you call it?
2.9.2 Given are sieve analysis results for materials to be blended for AC 14 mix along with the
required grading.
i.
Find the correct proportion for each aggregate stockpile to meet the required
grading for the proposed AC 14 mix.
Calculate the specific gravity of the blended aggregates.
ii.
Material
Percent Passing, %
BS Sieve
20.0 mm
14.0 mm
10.0 mm
5.0 mm
3.35 mm
1.18 mm
425 um
150 um
75 um
100
90
80
70
60
50
40
30
20
10
0
0.01
AC 14
100
90 - 100
76-86
50 - 62
40-54
18-34
12-24
6-14
4-8
0.10
Stockpile A
SG = 2.565
100
92.6
48.8
22.9
2.9
1.7
0
0
0
Stockpile B
SG = 2.654
% passing
100
100
98.2
45.4
30.4
12
6.7
2.3
0
1.00
Sieve Size, mm
Stockpile C
SG = 2.714
100
100
100
93.4
76.8
51.2
29.4
13.7
4.5
10.00
Stockpile D
SG = 3.200
100
100
100
100
100
100
100
98.4
88.9
100.00
Chapter 5 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Ch. 5 - Prob. 5.1QPCh. 5 - Discuss five different desirable characteristics...Ch. 5 - Discuss five different desirable characteristics...Ch. 5 - The shape and surface texture of aggregate...Ch. 5 - Define the following terms: a. Saturated...Ch. 5 - Three samples of fine aggregate have the...Ch. 5 - A sample of wet aggregate weighed 297.2 N. After...Ch. 5 - 46.5 kg (102.3 lb) of fine aggregate is mixed with...Ch. 5 - Samples of coarse aggregate from a stockpile are...Ch. 5 - Base course aggregate has a target dry density of...
Ch. 5 - Calculate the percent voids between aggregate...Ch. 5 - Calculate the percent voids between aggregate...Ch. 5 - Coarse aggregate is placed in a rigid bucket and...Ch. 5 - The following laboratory tests are performed on...Ch. 5 - Students in the materials lab performed the...Ch. 5 - The specific gravity and absorption test (ASTM...Ch. 5 - Prob. 5.18QPCh. 5 - Calculate the sieve analysis shown in Table P5.19...Ch. 5 - Calculate the sieve analysis shown in Table P5.20,...Ch. 5 - A sieve analysis test was performed on a sample of...Ch. 5 - A sieve analysis test was performed on a sample of...Ch. 5 - Draw a graph to show the cumulative percent...Ch. 5 - Referring to Table 5.6, plot the specification...Ch. 5 - Referring to the aggregate gradations A, B, and C...Ch. 5 - Table P5.26 shows the grain size distributions of...Ch. 5 - Table P5.27 shows the grain size distributions of...Ch. 5 - Three aggregates are to be mixed together in the...Ch. 5 - Table P5.29 shows the grain size distribution for...Ch. 5 - Laboratory specific gravity and absorption tests...Ch. 5 - Table P5.31 shows the grain size distribution for...Ch. 5 - Prob. 5.32QPCh. 5 - Laboratory specific gravity and absorption tests...Ch. 5 - Prob. 5.34QPCh. 5 - Define the fineness modulus of aggregate. What is...Ch. 5 - Calculate the fineness modulus of aggregate A in...Ch. 5 - Calculate the fineness modulus of aggregate B in...Ch. 5 - A portland cement concrete mix requires mixing...Ch. 5 - Discuss the effect of the amount of material...Ch. 5 - Aggregates from three sources having the...Ch. 5 - Aggregates from three sources having the...Ch. 5 - A contractor is considering using three stockpiles...Ch. 5 - Prob. 5.43QPCh. 5 - What are the typical deleterious substances in...Ch. 5 - Review ASTM D75 and summarize the following: a....
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