Efektivitas Metode Calcite Precipitation Dengan Biocatalyst Bubuk Kedelai Sebagai Metode Biogrouting Untuk Mencegah Likuifaksi Tanah Pasir

Akbar Renaldi Loebis; Heriansyah Putra

doi:10.29103/tj.v12i1.595

Efektivitas Metode Calcite Precipitation Dengan Biocatalyst Bubuk Kedelai Sebagai Metode Biogrouting Untuk Mencegah Likuifaksi Tanah Pasir

Akbar Renaldi Loebis, Heriansyah Putra

Abstract

Abstrak

Likuifaksi merupakan fenomena perubahan konsistensi tanah dari keadaan padat menjadi keadaan cair akibat gempa bumi. Metode calcite precipitation merupakan salah satu metode inovatif untuk mitigasi likuifaksi. Penelitian ini bertujuan mengevaluasi efektivitas metode calcite precipitation dengan biocatalyst bubuk kedelai sebagai metode biogrouting pada tanah terlikuifaksi. Penelitian ini menggunakan sampel tanah berpotensi likuifaksi dengan variasi gradasi. Pengujian pengendapan kalsit diperlukan untuk menentukan komposisi optimum larutan calcite precipitation. Evaluasi efektivitas pada tanah dilakukan dengan pengujian distribusi kalsit dan penentuan nilai kekuatan tanah berdasarkan kurva hubungan antara kadar kalsit dan nilai UCS. Hasil pengujian pengendapan kalsit didapatkan konsentrasi bubuk kedelai 15 g/L sebagai komposisi optimum larutan calcite precipitation. Nilai kadar kalsit maksimum yang terbentuk di sampel pasir halus, sedang, dan kasar berturut-turut sebesar 4,96; 6,12; dan 1,32 % sehingga mampu menghasilkan nilai prediksi UCS sebesar 132, 172, dan 59 kPa. Hasil penelitian ini didapatkan metode calcite precipitation dengan biocatalyst bubuk kedelai terbukti efektif diaplikasikan pada sampel pasir untuk meningkatkan kekuatan tanah sehingga mampu mencegah terjadinya peristiwa likuifaksi.

Kata kunci: bubuk kedelai, gradasi tanah, kalsit, likuifaksi

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.

Keywords: calcite, liquefaction, soil gradation, soybean powder

Keywords

calcite, liquefaction, soil gradation, soybean powder

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References

ASTM 2006, ASTM D: 2487-06 Standar practice for classification of soils for engineering purpose (unified soil classification system), American Society for Testing and Materials, Pennyslvania.

Baiq, H., Yasuhara, H., Kinoshita, N., Putra, H., Johan, E., 2020. Examination of calcite precipitation using plant-derived urease enzyme for soil improvement’. International Journal of GEOMATE 19, 231–237.

Dilrukshi, R., Nakashima, K., Kawasaki, S., 2018. Soil improvement using plant-derived urease-induced calcium carbonate precipitation’. Soils and Foundation 58, 894–910.

Gao, Y., He, J., Tang, X., Chu, J., 2019. Calcium carbonate precipitation catalyzed by soybean urease as an improvement method for fine-grained soil. Soils and Foundation 59, 1631–1637.

Kawasaki, S., Akiyama, M., 2013. Effect of addition of phosphate powder on unconfined compressive strength of sand cemented with calcium phosphate compound. Materials Transactions 54, 1–6.

Lee, S., Kim, J., 2020. An experimental study on enzymatic-induced carbonate precipitation using yellow soybeans for soil stabilization. KSCE Journal of Civil Engineering 24, 1–12.

Mangunparaja, D., Prihatiningsih, A., 2019. Analisis perbaikan tanah sebagai bentuk mitigasi bencana likuifaksi yang dapat diaplikasikan masyarakat di Palu. Jurnal Mitra Teknik Sipil 2, 95–104.

Neupane, D., Yasuhara, H., Kinoshita, N., Putra, H., 2015. Distribution of grout material within 1-m sand column in insitu calcite precipitation technique. Soils and Foundation 55, 1512–1518.

Pratama, G., Yasuhara, H., Kinoshita, N., Putra, H., 2021. Application of soybean powder as urease enzyme replacement on EICP method for soil improvement technique, in: The 1st International Seminar on Civil and Environmental Engineering (ISCEE) 2020. IOP Conference Series: Earth and Environmental Science, Bogor, Indonesia, pp. 1–7.

Putra, H., Erizal, Sutoyo, Simatupang, M., Yanto, D., 2021. Improvement of organic soil shear strength through calcite precipitation method using soybeans as bio-catalyst. Crystals 11, 1–14.

Putra, H., Yasuhara, H., Erizal, Sutoyo, Fauzan, M., 2020a. Review of enzyme-induced calcite precipitation as a ground-improvement technique. Infrastructures 5, 1–14.

Putra, H., Yasuhara, H., Kinoshita, N., Fauzan, M., 2020b. Promoting precipitation technique using bio-chemical grouting for soil liquefaction prevention. Civil Engineering Dimension 22, 1–5.

Putra, H., Yasuhara, H., Kinoshita, N., Hirata, A., 2017a. Optimization of enzyme-mediated calcite precipitation as a soil-improvement technique: the effect of aragonite and gypsum on the mechanical properties of treated sand. Crystals 7, 1–15.

Putra, H., Yasuhara, H., Kinoshita, N., Hirata, A., 2017b. Application of magnesium to improve uniform distribution of precipitated minerals in 1-m column specimens. Geomechanics and Engineering 12, 803–813.

Putra, H., Yasuhara, H., Kinoshita, N., Neupane, D., Lu, C.-W., 2016. Effect of magnesium as substitute material in enzyme-mediated calcite precipitation for soil-improvement technique. Frontiers in Bioengineering and Biotechnology 4, 1–9.

Sausan, S., Sakti, B., Leo, H., Yuliani, A., 2017. Robot pointer sebagai penunjuk jalan tim SAR untuk mempermudah pencarian korban bencana gempa. Jurnal Rekayasa Elektrika 13, 112–118.

Tsuchida, H., 1970. Evaluation of liquefaction potential of sandy deposit and measures against liquefaction induced damage, in: Proceedings of the Annual Seminar of the Port and Harbour Research Institute, Ministry of Transport. Yokosuka, Japan, pp. 1–3.

Yang, D., Xu, G., Duan, Y., 2020. Effect of particle size on mechanical property of bio-treated sand foundation. Applied Science 10, 1–16.

Zulfikar, R., Putra, H., Yasuhara, H., 2021. Utilization of soybean as catalyst material in enzyme-mediated calcite precipitation (EMCP) for crack healing concrete. Journal of the Civil Engineering Forum 7, 59–70.

DOI: http://dx.doi.org/10.29103/tj.v12i1.595