Improving mechanical performance of soil-bentonite by slag cement addition

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Publication Title
Improving mechanical performance of soil-bentonite by slag cement addition

Abstract
Soil bentonite (SB) mixtures generally presents inadequate mechanical properties compared to other cutoff wall materials. Since both deformability and a certain level of strength properties need to be achieved for static loads or in situations of dynamic loads, the cement amendment is adopted to improve the engineering performance and ensuring the long-term effectiveness of SB cutoff walls. This study investigated the strength properties and deformation characteristics of soil-bentonite mixtures amended with slag cement using Consolidated-Undrained (CU) triaxial tests. The contents of slag cement powder considered were 25, 50, and 75 kg/m3. The test results indicate that the undrained shear strength, residual shear strength and effective strength parameters are significantly influenced by the integration of cementation and consolidation. As compared in different cement addition, the 25 kg/m3 cement amended specimens shows strain-hardening behaviours, 42.7 to 65.1 kPa undrained shear strength in ductile failure mode with no discernible cracks, which signifying plastic deformation with high deformability under triaxial loading. This implies that, although the contents of the slag cement were not so high, such as 25 kg/m3, the amended soil-bentonite performed high strength and deformability.
Authors
J. Chen; Yusuke Masaki; Atsushi Takai; Tomohiro Kato; Takeshi Katsumi

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

E - Environment, water and energy

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