Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Multiple-phase enzyme-induced carbonate precipitation (EICP) method for soil improvement
Abstract Enzyme-induced carbonate precipitation (EICP) is a potential method to improve the mechanical properties of granular soil. The one-phase premixed percolation method using purified urease enzyme is widely adopted for in-situ EICP treatment currently, but it is expensive and uses a relatively large amount of urease. This paper proposes a multiple-phase method consisting of a percolation of premixed soybean crude urease and cementation solution followed by several percolations of cementation solution in one cycle of biocementation. The utilizing rate of urease was increased by at least four times for the production of precipitated carbonate compared with the one-phase method. The proposed method also weakened the clogging of carbonate precipitation, thus bringing out a relatively uniform EICP treatment. After four cycles of biocementation (each cycle included five applications of cementation solution), the unconfined compressive strength of EICP-treated ASTM C778-graded sand exceeded 10 MPa with a CaCO3 content of ~20%.
Highlights Soybean crude urease was employed to catalyze CaCO3 precipitation via EICP. A multiple-phase EICP method was proposed for soil improvement. The proposed method could significantly improve utilization efficiency of urease. A relatively uniform CaCO3 precipitation was obtained in EICP-treated sand. The UCS of EICP-treated sand exceeded 10 MPa with a CaCO3 content of ~20%.
Multiple-phase enzyme-induced carbonate precipitation (EICP) method for soil improvement
Abstract Enzyme-induced carbonate precipitation (EICP) is a potential method to improve the mechanical properties of granular soil. The one-phase premixed percolation method using purified urease enzyme is widely adopted for in-situ EICP treatment currently, but it is expensive and uses a relatively large amount of urease. This paper proposes a multiple-phase method consisting of a percolation of premixed soybean crude urease and cementation solution followed by several percolations of cementation solution in one cycle of biocementation. The utilizing rate of urease was increased by at least four times for the production of precipitated carbonate compared with the one-phase method. The proposed method also weakened the clogging of carbonate precipitation, thus bringing out a relatively uniform EICP treatment. After four cycles of biocementation (each cycle included five applications of cementation solution), the unconfined compressive strength of EICP-treated ASTM C778-graded sand exceeded 10 MPa with a CaCO3 content of ~20%.
Highlights Soybean crude urease was employed to catalyze CaCO3 precipitation via EICP. A multiple-phase EICP method was proposed for soil improvement. The proposed method could significantly improve utilization efficiency of urease. A relatively uniform CaCO3 precipitation was obtained in EICP-treated sand. The UCS of EICP-treated sand exceeded 10 MPa with a CaCO3 content of ~20%.
Multiple-phase enzyme-induced carbonate precipitation (EICP) method for soil improvement
Meng, Hao (Autor:in) / Shu, Shuang (Autor:in) / Gao, Yufeng (Autor:in) / Yan, Boyang (Autor:in) / He, Jia (Autor:in)
Engineering Geology ; 294
09.09.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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