Experimental Investigation of CementSoda Residue for SolidificationStabilization of Cr-Contaminated Soils
Joint Authors
Xu, Long
Yang, Chengbin
Chu, Chengfu
Zha, Fusheng
Zhu, Fanghua
Kang, Bo
Deng, Yongfeng
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-13, 13 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-07-25
Country of Publication
Egypt
No. of Pages
13
Main Subjects
Abstract EN
Adopting more efficient and sustainable remediation materials is of great importance for the development of solidification and stabilization (S/S) technology.
Among them, soda residue could be considered as a desirable binder due to its strong adsorption for heavy metals.
For understanding of the performance of Cr-contaminated soils treated by cement/soda residue, the strength, leaching and microstructural characteristics, and the long-term effectiveness under wetting-drying cycles were comprehensively investigated in this study.
The results showed that the unconfined compressive strength (UCS) increased and the leached Cr3+ concentration decreased with curing time, binder content, and binder ratio.
Increasing the soda residue from C6S14 to C6S24 could improve soil strength and reduce leachability of Cr3+, while a reverse trend was presented with increasing initial Cr3+ concentration.
With subsequent wetting-drying cycles, the UCS further increased and then decreased; inversely, the leached Cr3+ decreased, followed by an increase of Cr-contaminated soils.
For the specimens of C6S14 and C6S24, the maximum UCS of 6.04 MPa and 6.48 MPa was reached; correspondingly, the minimum leached Cr3+ concentration of 2.78 mg/L and 1.93 mg/L was reached after 3 wetting-drying cycles, respectively.
Microstructure analysis results found that reaction products like calcium silicate hydrate (C-S-H) and ettringite (AFt) increasingly occupied the soil pore space and caused a denser soil structure after 3 wetting-drying cycles, which indicated the long-term effectiveness of contaminated soils treated by cement/soda residue.
American Psychological Association (APA)
Zha, Fusheng& Zhu, Fanghua& Kang, Bo& Xu, Long& Deng, Yongfeng& Yang, Chengbin…[et al.]. 2020. Experimental Investigation of CementSoda Residue for SolidificationStabilization of Cr-Contaminated Soils. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1125436
Modern Language Association (MLA)
Zha, Fusheng…[et al.]. Experimental Investigation of CementSoda Residue for SolidificationStabilization of Cr-Contaminated Soils. Advances in Civil Engineering No. 2020 (2020), pp.1-13.
https://search.emarefa.net/detail/BIM-1125436
American Medical Association (AMA)
Zha, Fusheng& Zhu, Fanghua& Kang, Bo& Xu, Long& Deng, Yongfeng& Yang, Chengbin…[et al.]. Experimental Investigation of CementSoda Residue for SolidificationStabilization of Cr-Contaminated Soils. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-13.
https://search.emarefa.net/detail/BIM-1125436
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1125436