Abstract
Environmentally friendly soil improvement materials have been developed over the past decade. Utilization of biotechnology in biocementation for engineering geotechnical materials has been proven to increase the shear strength of soils. This biocementation method uses the urease enzyme mixed with a solution of urea and calcium chloride. The purpose of this study was to determine the effect of increasing the concentration of the urease enzyme in sand soil stabilized with biocementation and clay addition. This research will be compared with previous studies with a ratio of 1:4. Mixing is done manually and tested using direct shear and permeability testing. Curing time for the biocementation process is carried out for two and four weeks. The result of this test is the increase in shear strength of soil due to the addition of clay and the biocementation process of the urease enzyme.
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