SEBS-Polymer-Modified Slag–Cement–Bentonite for Resilient Slurry Walls
Publication Date
2022-02-12Journal Title
Sustainability
Publisher
MDPI AG
Volume
14
Issue
4
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Cao, B., Zhang, Y., & Al-Tabbaa, A. (2022). SEBS-Polymer-Modified Slag–Cement–Bentonite for Resilient Slurry Walls. Sustainability, 14 (4) https://doi.org/10.3390/su14042093
Abstract
<jats:p>In spite of the well-established design and construction approaches of slag–cement–bentonite slurry walls, the materials deteriorate inevitably in contaminated land. The development of effective materials which are sustainable, resilient and self-healing over the lifetime of slurry walls becomes essential. This study, for the first time, adopts a styrene–ethylene/butylene–styrene (SEBS) polymer to modify slag–cement–bentonite materials to enhance mechanical and self-healing performance. The results show that the increase in SEBS dosage results in significantly increased strain at failure, indicating the enhanced ductility thanks to the modification by the deformable polymer. The increased ductility is beneficial as the slurry wall could deform to a greater extent without cracks. After the permeation of liquid paraffin, the SEBS exposed on the crack surface swells and seals the crack, with the post-healing permeability only slightly higher than the undamaged values, which exhibits good self-healing performance. Scanning electron microscopy and micro-computed tomography analyses innovatively reveal the good bonding and homogeneous distribution of SEBS in slag–cement–bentonite. SEBS acts as a binder to protect the slag–cement–bentonite sample from disintegration, and the swollen SEBS particles effectively seal and heal the cracks. These results demonstrate that the SEBS-modified slag–cement–bentonite could provide slurry walls with resilient mechanical properties and enhanced self-healing performance.</jats:p>
Keywords
SEBS, cement–bentonite, slag, slurry wall, cut-off, self-healing, resilient materials
Sponsorship
Engineering and Physical Sciences Research Council (EP/P02081X/1)
National Natural Science Foundation of China (42107220)
Shanghai Sailing Program (21YF1449200)
Identifiers
External DOI: https://doi.org/10.3390/su14042093
This record's URL: https://www.repository.cam.ac.uk/handle/1810/333988
Rights
Licence:
https://creativecommons.org/licenses/by/4.0/
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