1. The results of a grading test on a sample of lateritic gravel intended for the sub-base courseof a road project are shown below. The Atterberg limit tests gave a liquid limit of 42 and aPlastic Limit of 20.Table 1 for Question 1Size37.1019.006.703.181.180.4250.3000.2120.075Percentagepassing(%)Plot the grading curve100.0091.8246.1733.8828.9917.4315.8214.2211.72i)2. Part of the results of compaction for a CBR test is shown in Table 2Table 2 Part of CBR test resultsSOAKED CBR TEST RESULTSSUB BASE 1Mould No.A2No. of blows per layerWet sample + Mould (g)Mass of Mould1012,0007,500Mass of wet sampleVolume of Mould2115Bulk density (g/cc)Test12Container No.E4B587.23Wet sample + container (g)Dry sample + container (g)Mass of container81.4283.8278.6614.4614.22Mass of waterMass of dry sampleWater contentAverage water contentDry densityi)ii)Compute the dry density and the void ratioCalculate the degree of saturation and porosity of the sampleb) The results of compaction test using the Modified AASHTO specification (AASHTOT180) on a soil sample are shown in Table 3 below.Table 3 Compaction Test Results9.42Water Content (%)6.2512.0914.55Dry Density (Mg/m³)1.721.891.881.83Plot the compaction curve for the material and determine the optimum moisture content andmaximum dry density1

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1. The results of a grading test on a sample of lateritic gravel intended for the sub-base course of a road project are shown below. The Atterberg limit tests gave a liquid limit of 42 and a Plastic Limit of 20. Table 1 for Question 1 3.18 Size 37.10 19.00 6.70 1.18 0.425 0.300 0.212 0.075 Percentage passing (%) Plot the grading curve 100.00 91.82 46.17 33.88 28.99 17.43 15.82 14.22 11.72 i)

1. The results of a grading test on a sample of lateritic gravel intended for the sub-base course of a road project are shown below. The Atterberg limit tests gave a liquid limit of 42 and a Plastic Limit of 20. Table 1 for Question 1 3.18 Size 37.10 19.00 6.70 1.18 0.425 0.300 0.212 0.075 Percentage passing (%) Plot the grading curve 100.00 91.82 46.17 33.88 28.99 17.43 15.82 14.22 11.72 i)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Soil engineering for highway design

Soil engineering is a part of geotechnical engineering that deals with the characteristics of soil. It also helps to understand the behavior of the soil in different conditions. The basic concepts of soil are studied to check the strength, compressibility, and porosity of the soil. This makes soil engineering an important topic for civil engineering.

Question

1. The results of a grading test on a sample of lateritic gravel intended for the sub-base course
of a road project are shown below. The Atterberg limit tests gave a liquid limit of 42 and a
Plastic Limit of 20.
Table 1 for Question 1
Size
37.10
19.00
6.70
3.18
1.18
0.425
0.300
0.212
0.075
Percentage
passing
(%)
Plot the grading curve
100.00
91.82
46.17
33.88
28.99
17.43
15.82
14.22
11.72
i)
2. Part of the results of compaction for a CBR test is shown in Table 2
Table 2 Part of CBR test results
SOAKED CBR TEST RESULTS
SUB BASE 1
Mould No.
A2
No. of blows per layer
Wet sample + Mould (g)
Mass of Mould
10
12,000
7,500
Mass of wet sample
Volume of Mould
2115
Bulk density (g/cc)
Test
1
2
Container No.
E4
B5
87.23
Wet sample + container (g)
Dry sample + container (g)
Mass of container
81.42
83.82
78.66
14.46
14.22
Mass of water
Mass of dry sample
Water content
Average water content
Dry density
i)
ii)
Compute the dry density and the void ratio
Calculate the degree of saturation and porosity of the sample
b) The results of compaction test using the Modified AASHTO specification (AASHTO
T180) on a soil sample are shown in Table 3 below.
Table 3 Compaction Test Results
9.42
Water Content (%)
6.25
12.09
14.55
Dry Density (Mg/m³)
1.72
1.89
1.88
1.83
Plot the compaction curve for the material and determine the optimum moisture content and
maximum dry density
1

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