Effects Of Bio Cementation On Engineering Properties Of Soil With And Without Rice Husk Ash

Abstract

Different soil improvement techniques, such as chemical grouting, stone columns, the mixing newlineof natural and synthetic materials, etc. are being used all over the world to satisfy the newlineengineering requirements for the construction of any civil engineering structures like highway newlinepavement, runways, building foundations, bridges, etc. Nevertheless, the majority of these newlinemethods rely on artificial or mechanical components, which need a lot of energy to produce or newlineinstall. Therefore, looking for innovative, cost-effective, environment-friendly, and overall newlinemore sustainable soil improvement techniques becomes necessary. The most recent and newlineenvironmentally friendly soil improvement technique now considered in geotechnical newlineengineering is bio-cementation. The bio-cementation is a recent technique for improving soil newlineproperties in which bacteria is used to create calcium carbonate crystals which acts as particle newlinebinding or pore-filling materials between soil particles. newlineThe main objective of the present study is to examine the effect of the bio-cementation newlineprocess on the physical and geotechnical properties of locally available silty sand with and newlinewithout the addition of the rice husk ash (RHA) additive. The soil used in the current study was newlinecollected from Lekhi village along National Highway 415, Arunachal Pradesh, India. Bacillus newlineSp Bacteria obtained from the Microbial Type Culture Collection and Gene Bank in newlineChandigarh, India, was used for the preparation of bio-cemented soil samples. These samples newlinewere prepared with 0.5, 1.0, and 1.5 optimal density (OD) concentrations of bacterial solution newlineand 0.5, 1.0, and 1.5 Molarity (M) cementation solution at their optimum moisture content and newlinemaximum dry density values. The RHA additive was added at 5%, 10%, and 15% for newlinepreparating control+RHA and bio-cemented+RHA samples. In the present study, curing period newlineof 0, 3, 7, 14, and 28 days were considered. Different laboratory tests were conducted on the newlinesoil samples, namely compaction test.