Open AccessFactors Affecting Bio-cemented Typical Silt from Middle and Lower Reaches of Yellow River
Author(s) -
Yunfeng Zhao,
Fei Ge,
Yang Yong-xiang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/304/2/022061
Subject(s) - silt , calcium carbonate , urease , calcite , calcium , chemistry , compressive strength , microorganism , grain size , nutrient , environmental chemistry , mineralogy , materials science , bacteria , geology , metallurgy , composite material , enzyme , biochemistry , geomorphology , paleontology , organic chemistry
Microbial-induced calcite precipitation (MICP) technique takes advantage of the metabolic process of bacteria bonding soil particles together with an environmentally-friendly and sustainable manner. In this study, the silt from reaches of Yellow River was used for bio-grouting. The effects of temperature, pH, inoculum size and revolving speed on urease activity were studied by single factor method for Sporosarcina pasteurii. Moreover, the effects of different nutrient concentrations on the stabilization for the typical silt were evaluated. Highest urease activity could be obtained under temperature of 32 °C, inoculum size of 5%, pH of 8 and speed of 180 r/min. Besides, higher concentration of calcium salt could generate more calcium carbonate effectively, and calcium carbonate content can reach to 261mg/g with uniaxial compressive strength of 1.7 MPa.