CEGE0100 PART I: TEST (SUPPL)
Answer on the separate sheet provided.
A ground investigation is being carried out on the site of a future development. Preliminary results are available from laboratory tests on soil samples that were retrieved from the site. You are required to analyse the data and determine the following:
1. Particle size distribution, d50, coefficient of uniformity (plot on Fig.1) [30 marks]
2. Plasticity index [40 marks]
3. Soil description [30 marks]
The laboratory test results are summarised below.
Table 1 (sieving results)
|
B.S. sieve (mm)
|
mass retained on sieve (g)
|
|
6
|
0
|
|
2
|
94
|
|
1.18
|
67.64
|
|
0.6
|
127.51
|
|
0.45
|
45.76
|
|
0.212
|
63.44
|
|
0.15
|
38.47
|
|
0.063
|
62
|
|
remaining
|
115.1
|
Table 2 (plastic limit tests)
|
|
mass tin +
wet soil (g)
|
mass tin +
dry soil (g)
|
mass tin (g)
|
|
sample 1
|
50.6
|
47.1
|
29.5
|
|
sample 2
|
50.1
|
46.8
|
29.3
|
|
sample 3
|
50.5
|
47
|
29.5
|
Table 3 (liquid limit tests)
|
|
penetration (mm)
|
water content (%)
|
|
sample 1
|
8.1
|
24.3
|
|
sample 2
|
18.2
|
35.1
|
|
sample 3
|
29.8
|
55
|