Strength Improvement of Locally Available Sand Using Enzymatically-Induced Calcite Precipitation
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In the present study laboratory experiments were conducted for the strengthening of locally available river sand of Bhima river (Maharashtra, India) using sword bean extracted as a urea catalyst in place of microorganisms like Sporosarcina pasteurii, which leads to decomposition of urea into ammonia and carbonates. As a calcium source, calcium hydroxide and calcium chloride were considered and mixed separately with sand to observe precipitation of calcite within the matrix of sand. At room temperature, sand matrix with the extract of Sword bean was compacted into a cylindrical specimen and cured for four days and similar specimen without plant extract (virgin sample) was prepared for comparison. With different calcium sources and amounts of urea, unconfined compression tests (UCS) were conducted on treated and untreated sand. It is observed that, with increasing amounts of urea, increase in the UCS for the specimens having calcium chloride has enhanced considerably compared to calcium hydroxide. Sand treated with extract of sword beans has shown higher increase in UCS (324 kPa) as compared to that of without plant extract. It was observed that, calcium chloride is a more effective calcium source when compared with calcium hydroxide.
KeywordsLocally available sand Sword bean extract Microorganisms Calcite precipitation Unconfined compression strength (UCS)
The authors would like to express their sincere thanks to Principal, D. Y. Patil Institute of Technology, Pimpri, Pune. Thanks also to Dr. P. D. Nemade for full support and being the source motivation.
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