EFFECT OF CURING TEMPERATURE AND PERIOD ON ENZYMATIC INDUCED CALCITE PRECIPITATION PROCESS FOR SUSTAINABLE SOIL IMPROVEMENT
Effect of Curing Temperature and Period on EICP Process for Sustainable Soil Improvement
DOI:
https://doi.org/10.55766/sujst-2023-01-e01868Keywords:
Sustainable soil improvement, Enzymatic Induced Calcite Precipitation (EICP), curing temperature, curing periodAbstract
Enzymatic induced calcite precipitation (EICP) is a novel, innovative, sustainable and environmentally friendly technique for soil improvement. EICP utilizes extracted free urease enzyme to induce calcite precipitation. Being enzymatic reaction, EICP process is susceptible to variation in pH, temperature, concentrations of reactants and urease enzyme content. This research studied the effect of curing temperature, ranging from 30 to 60°C on the shear strength and calcium carbonate content (CCC) of EICP treated residual soils cured at 3, 7, and 14 days. Based on the experimental results obtained, it was found that curing temperature has tremendous effect on the shear strength and CCC, while curing period has insignificant influence on the strength and CCC of EICP treated residual soils. The results have shown that at 3 days curing period, maximum shear strengths of 763.29 and 876.92 kPa were determined at optimum curing temperature of 50oC when the residual soil was treated with 0.50 and 1.00 M, respectively. It was also found that the increased in shear strength and CCC of EICP treated residual soil was insignificant beyond 3 days curing period. The UCS values of 0.50 M treated samples cured under 50°C at 3, 7, and 14 days were 763.29, 781.15, and 790.99 kPa. In summary, curing temperature has tremendous effect on the shear strength and CCC of EICP treated residual soil and maximum efficiency of the EICP process could be attained at 50°C.
References
Almajed, A., Tirkolaei, H.K., and Kavazanjian, E. (2018). Baseline investigation on enzyme-induced calcium carbonate precipitation J. Geotech. Geoenviron. Eng., 144:1-11.
BS 1377-2. (1990). British Standard Methods of test for Soils for civil engineering purposes. Part 2: Classification tests.
Cheng, L., Shahin, M.A., Addis, M., Hartanto, T., and Elms, C. (2014). Soil Stabilisation by Microbial-Induced Calcite Precipitation ( MICP ): Investigation into Some Physical and Environmental Aspects, p. 10-4.
Dilrukshi, R.A.N. and Kawasaki, S. (2016). Effective Use of Plant-Derived Urease in the Field of Geoenvironmental/ Geotechnical Engineering J. Civ. Environ. Eng., 06.
Keykha, H.A., Asadi, A., and Zareian, M. (2017). Environmental Factors Affecting the Compressive Strength of Microbiologically Induced Calcite Precipitation-Treated Soil Geomicrobiol. J. 34:889-894.
Lee, S. and Kim, J. (2020). An Experimental Study on Enzymatic-Induced Carbonate Precipitation Using Yellow Soybeans for Soil Stabilization KSCE J. Civ. Eng., 24:2,026-2,037.
Miao, L., Wu, L., and Sun, X. (2020). Enzyme-catalysed mineralisation experiment study to solidify desert sands Sci. Rep., 10:1-13.
Miao, L., Wu, L., Sun, X., Li, X., and Zhang, J. (2020). Method for solidifying desert sands with enzyme-catalysed mineralization L. Degrad. Dev., 31:1,317-1,324.
Nemati, M. and Voordouw, G. (2003). Modification of porous media permeability, using calcium carbonate produced enzymatically in situ Enzyme Microb. Technol., 33:635-642.
Neupane, D., Yasuhara, H., Kinoshita, N., and Ando, Y. ๖(2015). Distribution of mineralized carbonate and its quanti fi cation method in enzyme mediated calcite precipitation technique Soils Found., 55:447-457.
Oliveira, P.J.V., Freitas, L.D., and Carmona, J.P.S.F. (2017). Effect of soil type on the enzymatic calcium carbonate precipitation process used for soil improvement J. Mater. Civ. Eng., 29:1-7.
Umar, M., Kassim, K.A., and Chiet, K.T.P. (2016). Temperature Effect on the Strength Properties of Microbially Stabilized Residual Soil J. Teknol., 3:101-104.
Yasuhara, H., Neupane, D., Hayashi, K., and Okamura, M. (2012). Experiments and predictions of physical properties of sand cemented by enzymatically-induced carbonate precipitation Soils Found. 52:539-549.
