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Strength improvement in lateritic soil through MICP technique

 Department: Civil Engineering  
 By: usericon harnubhoi  

 Project ID: 7044
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Microbial Induced Calcite Precipitation (MICP) is one of the newest techniques used in soil stabilization, which involves the use of eco-friendly microorganisms to improve the engineering properties of soil. This research focused on the treatment of lateritic soil with microbial–induced calcite precipitate (MICP). Thirty-two Bacillus strains were screened for urease, an enzyme which initiates calcite precipitation and six strains were observed to produce urease enzyme reasonably. Bacillus strain (CE9) had the highest urease enzyme production at pH 7. The unconfined compressive strength (UCS) shows that the lateritic soil specimens treated with urease producing strains (UPS) had more strength compared with the untreated lateritic soil sample (control). The best two Bacillus strains UC10 and UC11, Bacillus mycodies_MTO47265 and Bacillus sp respectively with the highest UCS were further tested, singly and combined were compared but UC11 was preferred. The soil specimens were prepared in polyvinyl cylindrical molds of diameter 50 mm and 150 mm in height. 52 soil specimens were prepared, in which 4 control specimens were untreated and not cured. 48 of the treated specimens were also cured at varying ages by covering them with Polythene bags.  This was done to evaluate the effect of age and curing on strength development in bio-cemented lateritic soil. The dominant minerals present in the lateritic soil used are Quartz (45%), Orthoclase (18%), Muscovite (17%), Kaolinite (18.4%) and Chlorite (1.2%). Bacillus mycodies_MTO47265 was found to improve the performance of the tested soil specimens when compared with other strain and the consortium used. Increase in elemental concentration of calcium and carbon, after treatment with Bacillus mycodies_MTO47265, was found to be 0.32 and 1.02 respectively. The specimen treated with Bacillus mycoides_MTO47265 shows a fully clustered crystal morphology of calcite cementing the soil matrix when compared with that of an untreated specimen. ...
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