Mechanical properties of discarded shield residue improved by calcium carbide slag and fly ash as subgrade filling.

Autor: Wang S; Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing, China., Ding J; Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing, China., Guo Q; Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing, China., Jiao N; Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing, China., Li C; Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing, China.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 Dec 03; Vol. 19 (12), pp. e0314597. Date of Electronic Publication: 2024 Dec 03 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0314597
Abstrakt: To utilize discarded shield residue and alleviate the shortage of subgrade filling, industrial wastes such as calcium carbide slag (CCS) and fly ash (FA) were considered to enhance the mechanical properties of the shield residue. A series of laboratory tests, including California Bearing Ratio (CBR) tests, unconfined compressive strength (UCS) tests, moisture content tests, pH tests, water stability tests, and dry-wet cycles tests were performed on discarded shield residue with additive contents. The results show that the UCS and CBR values enhanced significantly with the increase in curing time. However, the moisture content and pH of the stabilized soil exhibited a decreasing trend. The early UCS of CCS-FA stabilized soil is slightly lower than that of QL-FA stabilized soil. After 60 curing days, all stabilized soil exhibited a UCS value exceeding 1.9 MPa. In addition, the CBR values of CCS-FA stabilized soil were more than 8 times higher than those of the original shield residue. Furthermore, the water stability of CCS-FA stabilized soil is slightly better than QL-FA stabilized soil, especially at 7 days and 14 days. As for dry-wet cycles test, after the fifth cycle, the CCS-FA stabilized soil maintained overall integrity. The CCS can effectively replace QL to enhance the mechanical properties of shield residue as subgrade filling.
Competing Interests: All authors have declared that they have no financial interests that could be perceived as influencing the work presented in this paper
(Copyright: © 2024 Wang et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
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