EFEKTIVITAS METODE CALCITE PRECIPITATION DENGAN BIOCATALYST BUBUK KEDELAI SEBAGAI METODE BIOGROUTING UNTUK MENCEGAH LIKUIFAKSI TANAH PASIR

Abstract

precipitation mitigasi efektivitas metode calcite precipitation dengan biocatalyst kedelai sebagai metode biogrouting pada tanah Penelitian menggunakan berpotensi likuifaksi dengan variasi gradasi. Pengujian pengendapan kalsit diperlukan untuk menentukan komposisi optimum larutan calcite precipitation. Evaluasi efektivitas Abstract Liquefaction was a phenomenon of change in soil consistency from a solid state to a liquid state due to the earthquake. Calcite precipitation method may be one of the innovative methods for liquefaction mitigation. The purpose of this research was to evaluate the effectiveness of the calcite precipitation method with soybean powder biocatalyst as a biogrouting method in liquefied soil. This research used potentially liquefied soil samples with various gradations. A precipitation test was needed to determined the optimum composition of the calcite precipitation solution. Evaluation of the effectiveness on soil was carried out by calcite distribution test and determining the value of soil strength based on the correlation curve between calcite contents and UCS values. The result of the precipitation test showed that 15 g/L soybean powder concentration was the optimum composition of the calcite precipitation solution. Maximum calcite content values had formed in fine, medium, and coarse sand sample was 4,96; 6,12; and 1,32 % so that able to produced UCS prediction values of 132, 172, and, 59 kPa. The results of this research show that calcite precipitation method with soybean powder biocatalyst proved to be effective on sand samples to improved the strength of the soils so can prevented liquefaction.