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Title: Workability study of sand-bentonite-cement mixtures for construction of two-phase cut-off wall
Authors: Cheng, Hongzhan
Li, Wentao
Chen, Renpeng
Yi, Yaolin
Keywords: Engineering::Civil engineering
Issue Date: 2022
Source: Cheng, H., Li, W., Chen, R. & Yi, Y. (2022). Workability study of sand-bentonite-cement mixtures for construction of two-phase cut-off wall. Construction and Building Materials, 345, 128058-.
Project: MOE-T2EP50220-0004
Journal: Construction and Building Materials
Abstract: The workability of fresh materials is critical for sand-bentonite-cement cut-off wall; however, previous studies are limited to the one-phase construction method, not the two-phase. Hence, this study attempts to fill the gap. First, series of flowability and bleeding tests on sand-bentonite mixtures were conducted (1st phase); subsequently, cement slurry was added to mixtures (2nd phase) to investigate its effect on the workability. The results indicated that, for sand-bentonite mixtures with required workability for 1st phase of construction, the addition of cement caused significant increase in flowability and bleeding, i.e. reducing the workability for 2nd phase, especially for sodium bentonite. The reason was revealed as the short-term interactions (mainly cation exchange) between bentonite and cement hydration products, reducing water retention capacity and swelling potential of bentonite.
ISSN: 0950-0618
DOI: 10.1016/j.conbuildmat.2022.128058
Rights: © 2022 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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