Mineralogical and chemical composition of some Bauchi soils and their relationship to passive Earth movement |
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| Authors: | D M Orazulike |
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| Institution: | (1) Geology Programme, ATB University, Bauchi, Nigeria |
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| Abstract: | Field and chemical data show that soils in some parts of Bauchi State, Nigeria, are rich in illite (20–35%), montmorillonite (60–75%), and kaolinite (45–73%). These expansive clays cause the soils to shrink and swell alternatively in response to the seasonal supply of moisture; resulting in observed damaging cracks. Plasticity index (PI) determinations on these soils are high (7–13.4%) suggesting that they are potentially hazardous. The attendant hazards and huge losses to the State are blamed on the expansive nature of these soils. The hazardous conditions can be mitigated by adopting proper construction precautions as well as by using chemical additives such as lime and phosphates, to lower the PI and help to increase the strength of the soils. |
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| Keywords: | Expansive soils Bauchi Nigeria |
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