Microbial Induced Modification of Silty Soil Using Bacillus Coagulans for Building Foundation

Sani J. E., Bala K. B. I.

Abstract


This research was carried out to modify the properties of silty soil with Bacillus. coagulans (B. coagulans) to make them fit to be used as building foundation. This was achieved using the microbial induced calcite precipitate process by treating the silty soil with B. coagulans with suspensions densities of 0 /ml, 1.5x108 /ml, 6.0x108 /ml, 12x108 /ml, 18x108 /ml and 24 x108 /ml at British Standard Light (BSL) compaction energy. The index properties of the soil, compaction characteristic (optimum moisture content (OMC) and maximum dry density (MDD)), shear strength parameters (cohesion and angle of internal friction) and the bearing capacity of the silty soil were determined.  The MDD shows an increase in value up to 6.0 × 109 cells/ml of B. coagulans suspension density before it drops slightly while the OMC on the other hand shows a decreasing trend with increase in B. coagulans suspension density up to 6.0 × 109 cells/ml before increasing slightly. The shear strength parameter which is a key parameters that influence the strength of foundation shows a decrease in value of cohesion with increase in B. coagulans suspension density while the angle of internal friction shows an increase in value with increase in B. coagulans suspension density. The results of the shear strength parameters, when used in Terzaghi’s equation for four types of foundation, the results of the shear strength parameters show a great increase in the bearing capacity of the silty soil, which shows a great improvement. The bearing capacity for square footing that gave the highest value increased from 977.98 to 1286.91 KN/m2 which is over 31.59% increase in strength, indicating improvement on the silty soil for building foundation. 18.0 × 108 cells/ml of B. coagulans suspension density is recommended for modification of soil for building foundation.


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