I) Two aggregates (Al and A2) were obtained from the field. A sieve analysis was performed on each sample, and the samples (originally 500g in mass) were brought to the oven dry condition (OD) and weighed. Data was obtained for each of the aggregates and is presented in the tables below. (Density of water-1g/cm) Table 1. Results from sieve analysis. Sieve Size Opening (mm) Weight of Aggregate retained (g) A1 A2 3/8" 9.5 No. 4 4.75 65 No. 8 2.36 60 25 No. 16 1.18 100 396 No. 30 0.6 5 50 No. 50 0.3 118.5 10 No. 100 0.15 75 15 Pan 75 Table 2. Absorption capacity and moisture content data. A1 A2 500 g 500 g Field Weight Oven Dry Weight Absorption Capacity (%) 0.7 % 498.5 g 496 g 0.6 % a) Plot the grading curve for each aggregate (x-axis: sieve opening, y-axis: %passing). (Note: In the grading curves, you must show all data points. You can draw the gradation chart using excel or by hand. If you draw by hand, you have to use a ruler. The format of the gradation chart should be same as in the Problem Set-Aggregates solutions) b) Determine the fineness modulus (FM) for Al and A2. Indicate which aggregate is coarser and which is finer. c) Describe the field moisture state of each aggregate, Al and A2 (i.e. wet, SSD, or air dry). For each sample would you add water or dry the sample to bring it to SSD state? Determine the expected mass of each sample in the SSD state. d) If the bulk volume Al oven dry is 200 cm' and the bulk volume of A2 oven dry is 180 cm, determine the bulk oven dry specific gravity for each aggregate, Al and A2.
I) Two aggregates (Al and A2) were obtained from the field. A sieve analysis was performed on each sample, and the samples (originally 500g in mass) were brought to the oven dry condition (OD) and weighed. Data was obtained for each of the aggregates and is presented in the tables below. (Density of water-1g/cm) Table 1. Results from sieve analysis. Sieve Size Opening (mm) Weight of Aggregate retained (g) A1 A2 3/8" 9.5 No. 4 4.75 65 No. 8 2.36 60 25 No. 16 1.18 100 396 No. 30 0.6 5 50 No. 50 0.3 118.5 10 No. 100 0.15 75 15 Pan 75 Table 2. Absorption capacity and moisture content data. A1 A2 500 g 500 g Field Weight Oven Dry Weight Absorption Capacity (%) 0.7 % 498.5 g 496 g 0.6 % a) Plot the grading curve for each aggregate (x-axis: sieve opening, y-axis: %passing). (Note: In the grading curves, you must show all data points. You can draw the gradation chart using excel or by hand. If you draw by hand, you have to use a ruler. The format of the gradation chart should be same as in the Problem Set-Aggregates solutions) b) Determine the fineness modulus (FM) for Al and A2. Indicate which aggregate is coarser and which is finer. c) Describe the field moisture state of each aggregate, Al and A2 (i.e. wet, SSD, or air dry). For each sample would you add water or dry the sample to bring it to SSD state? Determine the expected mass of each sample in the SSD state. d) If the bulk volume Al oven dry is 200 cm' and the bulk volume of A2 oven dry is 180 cm, determine the bulk oven dry specific gravity for each aggregate, Al and A2.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:I) Two aggregates (Al and A2) were obtained from the field. A sieve analysis was
performed on each sample, and the samples (originally 500g in mass) were brought to the
oven dry condition (OD) and weighed. Data was obtained for each of the aggregates and is
presented in the tables below. (Density of water-1g/cm)
Table 1. Results from sieve analysis.
Sieve Size
Opening
(mm)
Weight of Aggregate
retained (g)
A1
A2
3/8"
9.5
No. 4
4.75
65
No. 8
2.36
60
25
No. 16
1.18
100
396
No. 30
0.6
50
No. 50
0.3
118.5
10
No. 100
0.15
75
15
Pan
75
Table 2. Absorption capacity and moisture content data.
Al
A2
500 g
500 g
Field Weight
Oven Dry Weight
Absorption Capacity (%) 0.7 %
498.5 g
496 g
0.6 %
a) Plot the grading curve for each aggregate (x-axis: sieve opening, y-axis: %passing).
(Note: In the grading curves, you must show all data points. You can draw the gradation chart
using excel or by hand. If you draw by hand, you have to use a ruler. The format of the
gradation chart should be same as in the Problem Set-Aggregates solutions)
b) Determine the fineness modulus (FM) for Al and A2. Indicate which aggregate is coarser
and which is finer.
c) Describe the field moisture state of each aggregate, Al and A2 (i.e. wet, SSD, or air dry).
For each sample would you add water or dry the sample to bring it to SSD state? Determine
the expected mass of each sample in the SSD state.
d) If the bulk volume Al oven dry is 200 cm and the bulk volume of A2 oven dry is 180 cm,
determine the bulk oven dry specific gravity for each aggregate, Al and A2.
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