an engineering geological characterisation of tropical clays - GBV
an engineering geological characterisation of tropical clays - GBV
an engineering geological characterisation of tropical clays - GBV
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101<br />
Table 7.7, continued. Results <strong>of</strong> grain size <strong>an</strong>alysis for black <strong>clays</strong> <strong>an</strong>d red soils.<br />
Pr<strong>of</strong>ile<br />
Sample No. Clay (%) Silt (%) S<strong>an</strong>d (%) Gravel (%) % fines<br />
Class<br />
(BS 1377: 1975)<br />
SD1-30cm 32 59 7 2 91 silty clay<br />
D SD1-50cm 26 62 8 4 88 silty clay with s<strong>an</strong>d<br />
SD1-80cm 27 65 6 2 92 silty clay with s<strong>an</strong>d<br />
(black <strong>clays</strong>) SD5-30cm 31 60 7 2 91 silty clay<br />
SD5-50cm 26 62 8 4 88 silty clay with s<strong>an</strong>d<br />
SD5-80cm 28 64 6 2 92 silty clay with s<strong>an</strong>d<br />
SD7-30cm 32 58 8 2 90 silty clay<br />
SD7-50cm 26 63 7 4 89 silty clay with s<strong>an</strong>d<br />
SD7-70cm 25 66 5 4 91 silty clay with s<strong>an</strong>d<br />
SD17-30cm 13 71 8 8 84 clayey silt<br />
SD17-50cm 21 63 8 8 84 silty clay with s<strong>an</strong>d<br />
SD25-30cm 24 60 8 8 84 silty clay with s<strong>an</strong>d<br />
SD25-50cm 14 60 10 16 74 clayey silt<br />
SD29-30cm 27 63 6 4 90 silty clay with s<strong>an</strong>d<br />
SD29-50cm 28 64 5 3 92 silty clay with s<strong>an</strong>d<br />
SD33-30cm 29 61 6 4 90 silty clay with s<strong>an</strong>d<br />
SD33-50cm 28 63 6 3 91 silty clay with s<strong>an</strong>d<br />
SD41-30cm 35 57 7 1 92 silty clay<br />
SD41-50cm 41 48 6 5 89 clay<br />
SE1-30cm 31 58 7 4 89 silty clay<br />
E SE1-50cm 27 64 6 3 91 silty clay with s<strong>an</strong>d<br />
SE1-70cm 26 65 5 4 91 silty clay with s<strong>an</strong>d<br />
(black <strong>clays</strong>) SE5-30cm 31 58 7 4 89 silty clay<br />
SE5-50cm 28 63 5 4 91 silty clay with s<strong>an</strong>d<br />
SE5-70cm 26 64 6 4 90 silty clay with s<strong>an</strong>d<br />
SE13-30cm 33 60 5 2 93 silty clay<br />
SE13-50cm 34 58 5 3 92 silty clay<br />
SE21-30cm 24 70 5 1 94 silty clay with s<strong>an</strong>d<br />
SE21-50cm 20 68 6 6 88 clayey silt<br />
SE29-30cm 27 65 7 1 92 silty clay with s<strong>an</strong>d<br />
SE29-50cm 29 63 7 1 92 silty clay with s<strong>an</strong>d<br />
SE37-30cm 33 57 5 5 90 silty clay<br />
SE37-50cm 31 61 5 3 92 silty clay<br />
SE41-30cm 19 70 8 3 89 clayey silt<br />
SE41-50cm 19 66 8 7 85 clayey silt<br />
Rd1 -30cm 18 73 9 0 91 clayey silt<br />
Red soils Rd1-100cm 20 74 6 0 94 clayey silt<br />
Rd1-200cm 24 69 7 0 93 silty clay with s<strong>an</strong>d<br />
Rd1-400cm 20 72 8 0 92 silty clay with s<strong>an</strong>d<br />
soils are presented in the chart (Fig. 7.3b). A more summarised classification <strong>of</strong> all tested<br />
samples based on this chart is given in Table (7.7).<br />
In this study therefore, the grading curves provided a me<strong>an</strong>s by which soils could be classified<br />
(Table 7.7) <strong>an</strong>d their <strong>engineering</strong> properties broadly assessed. Engineering implications <strong>of</strong><br />
grain size distribution <strong>an</strong>d grading characteristics <strong>of</strong> black <strong>clays</strong> <strong>an</strong>d red soils on construction<br />
practice are discussed in the next chapter.