Abstract
AbstractFor any construction purpose, a strong and durable foundation is very much essential which requires a suitable sub soil condition. But the availability of competent soil conditions is not always possible. In such situations it needs to be stabilized in order to improve its properties. This study aims to analyze the effect of an innovative ground improvement technique by the use of Microbial Induced Calcite Precipitation (MICP) for improving the strength of a poorly graded sand. In this study, an attempt is made to study the effect of two different densities on the strength increase in the sand specimen. MICP is achieved through urea hydrolysis by the use of common soil bacterium Sporosarcina Pasteurii. The microbes were introduced into the specimens in liquid growth medium and urea + CaCl2 (cementitious solution) was injected later on. The optical density was studied during the injection. The injection of bacterial solutions and the cementitious solutions was carried out based on the standard procedure developed in various literature. The strength increase was found using the unconfined compressive testing and the precipitated minerals were identified using the X-ray diffraction analysis which confirms the formation of calcite crystals among the sand particles. The permeability of soil also is reduced by one order of magnitude.KeywordsMICPUrea hydrolysisOptical densityUCS and permeability
Published Version
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