TY - JOUR
T1 - Enhanced rainfall erosion durability of enzymatically induced carbonate precipitation for dust control
AU - Sun, Xiaohao
AU - Miao, Linchang
AU - Wang, Hengxing
AU - Yuan, Junhao
AU - Fan, Guangcai
N1 - Funding Information:
The authors thank the valuable comments from the reviewers. This study was funded by National Natural Science Foundation of China (grant number 51578147 ), Fundamental Research Funds for the Central Universities (grant number 2242020R20025 ), Science and Technology Department of Ningxia (grant number 2020BFG02014 ), and Transportation Department of Ningxia (grant number 202000173 ).
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/10/15
Y1 - 2021/10/15
N2 - Globally, most cities are facing severe challenges caused by dust pollution. Recently, the significant dust control application potential of the environmentally friendly enzymatically induced carbonate precipitation (EICP) has been demonstrated. However, repeated rainfall erosion negatively affects the long-term durability of several EICP treated areas. This study applied EICP and added either polyvinyl acetate (PVAc) or polyethylene glycol (PEG) to the cementation solution. The results showed that both PVAc and PEG could improve the shear resistance and rainfall-erosion resistance of treated dust soils. However, for repeated rainfall erosion, the surface strength and calcium carbonate (CaCO3) contents of samples still decreased to less than 250 kPa and 1.1%, respectively. Therefore, combined EICP-PVAc-PEG treatment was proposed and the rainfall-erosion durability of treated dust soils was further studied. With the EICP-PVAc-PEG treatment, the dust samples achieved better shear resistance, higher surface strength, and better repeated rainfall-erosion resistance. Considering cost, cementation effects, and the effects of repeated rainfalls, EICP-PVAc-PEG treatment with 50 g/L PVAc and 30 g/L PEG was most suitable for dust control. The combined EICP-PVAc-PEG treatment significantly suppressed the generation of dust and improved the rainfall-erosion durability.
AB - Globally, most cities are facing severe challenges caused by dust pollution. Recently, the significant dust control application potential of the environmentally friendly enzymatically induced carbonate precipitation (EICP) has been demonstrated. However, repeated rainfall erosion negatively affects the long-term durability of several EICP treated areas. This study applied EICP and added either polyvinyl acetate (PVAc) or polyethylene glycol (PEG) to the cementation solution. The results showed that both PVAc and PEG could improve the shear resistance and rainfall-erosion resistance of treated dust soils. However, for repeated rainfall erosion, the surface strength and calcium carbonate (CaCO3) contents of samples still decreased to less than 250 kPa and 1.1%, respectively. Therefore, combined EICP-PVAc-PEG treatment was proposed and the rainfall-erosion durability of treated dust soils was further studied. With the EICP-PVAc-PEG treatment, the dust samples achieved better shear resistance, higher surface strength, and better repeated rainfall-erosion resistance. Considering cost, cementation effects, and the effects of repeated rainfalls, EICP-PVAc-PEG treatment with 50 g/L PVAc and 30 g/L PEG was most suitable for dust control. The combined EICP-PVAc-PEG treatment significantly suppressed the generation of dust and improved the rainfall-erosion durability.
KW - Durability
KW - Dust pollution
KW - EICP
KW - Polyethylene glycol
KW - Polyvinyl acetate
UR - http://www.scopus.com/inward/record.url?scp=85107642354&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2021.148369
DO - 10.1016/j.scitotenv.2021.148369
M3 - Journal article
C2 - 34126498
AN - SCOPUS:85107642354
SN - 0048-9697
VL - 791
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 148369
ER -