TY - JOUR
T1 - Garlic extract addition for soil improvement at various temperatures using enzyme-induced carbonate precipitation (EICP) method
AU - Wang, Hengxing
AU - Sun, Xiaohao
AU - Miao, Linchang
AU - Cao, Ziming
AU - Guo, Xin
N1 - Funding Information:
The authors thank the valuable comments from the reviewers. This study was funded by the National Natural Science Foundation of China (Grant No. 51578147 ), the Science and Technology Department of Ningxia (Grant No. 2020BFG02014 ), and the Transportation Department of Ningxia (Grant No. 202000173 ).
Publisher Copyright:
© 2023 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
PY - 2023
Y1 - 2023
N2 - 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 °C), 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 (CaCO3) 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 CaCO3 contents at different parts of samples. The improved solidification homogeneity can achieve higher strength. The correlation between sonic time values and CaCO3 content was higher than that between CaCO3 content and strength. Appropriate concentrations of garlic extract were obtained at 35 °C, 40 °C, 45 °C, 50 °C, and 55 °C. The proposed garlic extract addition method was significant to improve the homogeneity of solidified soil in practical engineering applications.
AB - 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 °C), 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 (CaCO3) 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 CaCO3 contents at different parts of samples. The improved solidification homogeneity can achieve higher strength. The correlation between sonic time values and CaCO3 content was higher than that between CaCO3 content and strength. Appropriate concentrations of garlic extract were obtained at 35 °C, 40 °C, 45 °C, 50 °C, and 55 °C. The proposed garlic extract addition method was significant to improve the homogeneity of solidified soil in practical engineering applications.
KW - Enzyme-induced carbonate precipitation (EICP)
KW - Garlic extract addition
KW - Sand solidification
KW - Urease activity
UR - http://www.scopus.com/inward/record.url?scp=85165038120&partnerID=8YFLogxK
U2 - 10.1016/j.jrmge.2023.03.018
DO - 10.1016/j.jrmge.2023.03.018
M3 - Journal article
AN - SCOPUS:85165038120
SN - 1674-7755
JO - Journal of Rock Mechanics and Geotechnical Engineering
JF - Journal of Rock Mechanics and Geotechnical Engineering
ER -