Garlic extract addition for soil improvement at various temperatures using enzyme-induced carbonate precipitation (EICP) method
作者机构：Institute of Geotechnical EngineeringSchool of TransportationSoutheast UniversityNanjing210096China
出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)
年 卷 期：2023年第15卷第12期
页 面：3230-3243页
核心收录：
学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程]
基 金：funded by the National Natural Science Foundation of China(Grant No.51578147) the Science and Technology Department of Ningxia(Grant No.2020BFG02014) the Trans-portation Department of Ningxia(Grant No.202000173)
主 题：Enzyme-induced carbonate precipitation(EICP) Urease activity Garlic extract addition Sand solidification
摘 要：Enzyme-induced carbonate precipitation (EICP) is an emerging technique to improve the soil and most studies are carried out at room temperature. However, considering some foundations are in high-temperature environments (40 ℃), the higher urease activity at high temperature results in the solidification inhomogeneity, limiting the application of EICP. The higher urease activity at high temperature hampers the application of EICP because of solidification inhomogeneity. The garlic extract has been used as a type of urease inhibitor in medical science and food engineering. Here, we propose to use it to control urease activity for sand solidification at high temperature. The effects of garlic extract addition on urease activity and precipitation rates for calcium carbonate (CaCO_(3)) were studied. Extra tests were conducted to study the effect of garlic extract addition on the solidification homogeneity. The results showed that the garlic extract addition significantly decreased urease activity. To reduce the rate of CaCO3 precipitation at different temperatures, a suitable concentration of garlic extract was necessary to obtain a suitable urease activity. In the sand solidification test, garlic extract addition resulted in a smaller difference in sonic time values or CaCO_(3) contents at different parts of samples. The improved solidification homogeneity can achieve higher strength. The correlation between sonic time values and CaCO_(3) content was higher than that between CaCO3 content and strength. Appropriate concentrations of garlic extract were obtained at 35 ℃, 40℃, 45 ℃, 50 ℃, and 55 ℃. The proposed garlic extract addition method was significant to improve the homogeneity of solidified soil in practical engineering applications.
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