an engineering geological characterisation of tropical clays - GBV

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Table 7.3 (continued). Atterberg limits, activity/ free swell classification and assessment of
possible clay mineralogy of black clays and red soils of this study.
Profile
Sample No. Wn (%) LL (%) PL (%) PI (%) FS (%) Clay (%) Activity
F. swell
class
Activity class
(BS 1377:1975)
Possible clay
minerals
SD1-30cm 27 82 36 46 125 32 1,45 high active
D SD1-50cm 27 83 36 47 130 26 1,80 high active
SD1-80cm 30 91 42 49 140 27 1,83 high active
(black clays) SD5-30cm 26 84 36 47 125 31 1,52 high active smectites
SD5-50cm 27 84 36 48 130 26 1,84 high active
SD5-80cm 30 92 42 50 140 28 1,80 high active
SD7-30cm 27 84 36 48 110 32 1,50 high active
SD7-50cm 27 86 37 49 140 26 1,88 high active
SD7-70cm 30 91 39 52 135 25 2,08 high
SD17-30cm 20 84 40 44 120 13 3,38 high
highly
active
highly
active
highly
active
SD17-50cm 22 84 35 49 130 21 2,35 high
SD25-30cm 22 80 41 39 125 24 1,62 high active
SD25-50cm 21 84 40 45 135 14 3,19 high
highly
active
SD29-30cm 18 85 38 47 125 27 1,76 high active
SD29-50cm 22 86 35 51 145 28 1,81 high active
SD33-30cm 20 85 37 47 125 29 1,63 high active
SD33-50cm 21 86 35 50 145 28 1,79 high active
SD41-30cm 23 85 39 46 130 35 1,30 high active
SD41-50cm 25 90 41 49 135 41 1,19 high active
SE1-30cm 24 82 35 48 125 31 1,54 high active
E SE1-50cm 27 85 37 48 135 27 1,76 high active
SE1-70cm 30 91 39 52 145 26 1,98 high active
(black clays) SE5-30cm 25 85 37 48 125 31 1,54 high active smectites
SE5-50cm 27 86 38 48 130 28 1,70 high active
SE5-70cm 29 92 42 50 145 26 1,92 high active
SE13-30cm 21 86 39 47 125 33 1,42 high active
SE13-50cm 24 89 40 49 130 34 1,43 high active
SE21-30cm 25 88 39 49 125 24 2,05 high
highly
active
SE21-50cm 26 90 41 49 145 20 2,47 high
highly
active
SE29-30cm 22 81 36 46 120 27 1,69 high active
SE29-50cm 23 83 36 47 120 29 1,60 high active
SE37-30cm 21 85 37 48 125 33 1,44 high active
SE37-50cm 22 85 38 48 130 31 1,54 high active
SE41-30cm 22 87 40 47 135 19 2,46 high
highly
active
SE41-50cm 21 88 40 48 135 19 2,50 high
highly
active
Rd1 -30cm 39 49 31 18 20 18 0,99 low normal
Red soils Rd1-100cm 24 51 31 21 15 20 1,03 low normal kaolinite
Rd1-200cm 24 49 30 20 20 24 0,83 low normal
Rd1-400cm 25 48 30 18 15 20 0,89 low normal and/ or
Rd2-30cm 38 53 35 19 20 low
Rd2-100cm 26 57 34 22 15 low illite
Rd2-200cm 25 54 33 21 15 low
Rd2-400cm 26 53 34 19 15 low