TY - JOUR
T1 - Using microbial carbonate precipitation to improve the properties of recycled fine aggregate and mortar
AU - Feng, Zhangyao
AU - Zhao, Yuxi
AU - Zeng, Weilai
AU - Lu, Zhenmei
AU - Shah, Surendra P.
N1 - Funding Information:
Financial support from the National Natural Science Foundation of China ( 51578489 ) and the National Natural Science Foundation of China ( 41630637 ) is gratefully acknowledged.
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/1/10
Y1 - 2020/1/10
N2 - This study investigates the use of microbial carbonate precipitation (MCP) by Sporosarcina pasteurii (S. pasteurii) to improve the properties of recycled fine aggregate (RFA). The factors influencing MCP are experimentally investigated. The recommended precipitation conditions for the pH, bacteria concentration, and calcium concentration are determined to be 9.5, 108 cells/mL, and 0.55 mol/L, respectively. Under these proposed conditions, the effects of MCP modification on RFA are also investigated and found the weight of modified RFA increases and the water absorption of modified RFA decreases. The flexural strength and compressive strength of mortar specimens cast by modified aggregate are improved. The result confirms the positive effects of MCP for improving the properties of RFA.
AB - This study investigates the use of microbial carbonate precipitation (MCP) by Sporosarcina pasteurii (S. pasteurii) to improve the properties of recycled fine aggregate (RFA). The factors influencing MCP are experimentally investigated. The recommended precipitation conditions for the pH, bacteria concentration, and calcium concentration are determined to be 9.5, 108 cells/mL, and 0.55 mol/L, respectively. Under these proposed conditions, the effects of MCP modification on RFA are also investigated and found the weight of modified RFA increases and the water absorption of modified RFA decreases. The flexural strength and compressive strength of mortar specimens cast by modified aggregate are improved. The result confirms the positive effects of MCP for improving the properties of RFA.
KW - Bio-deposition modification
KW - Microbial carbonate precipitation
KW - Recycled fine aggregate
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U2 - 10.1016/j.conbuildmat.2019.116949
DO - 10.1016/j.conbuildmat.2019.116949
M3 - Article
AN - SCOPUS:85072573384
SN - 0950-0618
VL - 230
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 116949
ER -