Abstract
This research was carried out to evaluate the addition of soybean in the calcite precipitation method as a soil improvement technique. The evaluated soil was poorly graded and liquefiable sand with a specific gravity of 2.69. The precipitation test was performed to obtain the optimum concentration of grouting solution. Various combinations of soybean and reagent composed of urea and calcium chloride were prepared and were applied to sandy soil through the percolation method. The impacts of soybean on improving the shear strength of treated soil were examined using unconfined compression tests. The result of this study shows that the use of soybean shows a significant enhancement of the soil strength. The strength of 168 kPa was achieved when 60 g/L of soybean added to the grouting solution, which is also promoted a calcite amount of 3% of the soil mass. This research elucidated that the addition of soybean in the calcite precipitation technique is possible to optimize the calcite precipitation method’s applicability as the soil improvement technique.
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