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ARTICLE

Expansive Soil Stabilization by Bagasse Ash in Partial Replacement of Cement

Waleed Awadalseed1, Honghua Zhao1, Hemei Sun2, Ming Huang3, Cong Liu4,*
1 State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, 116023, China
2 State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, International Research Center for Computational Mechanics, Dalian University of Technology, Dalian, 116023, China
3 Department of Geotechnical Engineering, College of Civil Engineering, Hunan University, Changsha, 410082, China
4 College of Civil Engineering, Fuzhou University, Fuzhou, 350116, China
* Corresponding Author: Cong Liu. Email: lccong@mail.dlut.edu.cn

Journal of Renewable Materials https://doi.org/10.32604/jrm.2023.025100

Received 22 June 2022; Accepted 25 August 2022; Published online 15 November 2022

Abstract

This study examined the effects of using bagasse ash in replacement of ordinary Portland cement (OPC) in the treatment of expansive soils. The study concentrated on the compaction characteristics, volume change, compressive strength, splitting tensile strength, microstructure, California bearing ratio (CBR) value, and shear wave velocity of expansive soils treated with cement. Different bagasse ash replacement ratios were used to create soil samples. At varying curing times of 7, 14, and 28 days, standard compaction tests, unconfined compressive strength tests, CBR tests, Brazilian split tensile testing, and bender element (BE) tests were carried out. According to X-ray diffraction (XRD) investigations, quartz and crystobalite make up the majority of the minerals in bagasse ash. Bagasse ash contains a variety of grain sizes, including numerous fiber-shaped particles, according to a scanning electronic microscope (SEM) test. For all of the treated specimens with various replacement ratios, the overall additive content has not changed. The results of the Brazilian split tensile tests demonstrate improved tensile strength for all specimens with various replacement proportions. A lower maximum dry density and a greater optimal water content would result from the substitution of bagasse ash. When the replacement ratio is not more than 20%, the CBR values of the parts replaced specimens are even higher than the cement treatments. The results of BE testing on the treated soils show that there is significant stiffness anisotropy but that it steadily diminishes with curing time and replacement ratio. According to the study, bagasse ash is a useful mineral additive, and the best replacement ratio (CBA20) is 20%.

Keywords

Expansive soil; bagasse ash; cement; calcium silicate hydrate (CSH); stiffness anisotropy
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