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Published in:
2021 | OriginalPaper | Chapter
Study on Bio-cementation of Ex-coal Mining Soil as a Road Construction Material
Authors : A. M. Indriani, Tri Harianto, A. R. Djamaluddin, A. Arsyad
Published in: Advances in Sustainable Construction and Resource Management
Publisher: Springer Singapore
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Abstract
Hundreds of thousand hectares of ex-coal mining land are left without good management and use. This abandoned mine soil can be reused. This soil is composed of coal, sand and clay. Microstructural analysis shows that this material contains the chemical elements of quartz, titanium dioxide and clay minerals. This soil has been analyzed to determine its engineering properties and potentials for use in civil engineering construction. In this study, this soil was treated with bio-cementation to improve geomechanical properties by adding 3% and 6% Bacillus subtilis bacteria with bacterial culture for 6 days. Direct shear testing is done to see the increase in CBR and shear strength. The results showed that the CBR and shear strength of the soil increased with the addition of 6% bacteria and a curing time of 28 days then 3% bacteria in the same curing time.