Mechanical Properties and Microstructure of PVA Fiber Reinforced Cemented Soil
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-0998-x
Geotechnical Engineering
Mechanical Properties and Microstructure of PVA Fiber Reinforced Cemented Soil Xin Yaoa, Geng Huanga, Mingming Wanga, and Xiaoqiang Donga Dept. of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
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ARTICLE HISTORY
ABSTRACT
Received 2 June 2020 Revised 18 August 2020 Accepted 14 September 2020 Published Online 4 December 2020
In this work, the experimental study of unconfined compressive strength tests, direct tensile strength tests and three point bending tests were carried out to evaluate the effect of PVA fiber reinforcement on the mechanical behaviour of cemented silty soil. In general, the addition of polyvinyl alcohol (PVA) fiber lead to an increase in compressive strength, and it was observed more significant improvement in tensile strength and flexural strength, moreover, the inclusion of fibers effectively altered the brittle failure pattern of unreinforced cemented soil and improve the toughness and ductility. In addition, the microstructural of interaction between fibers and cemented soil was investigated. The proposal of regression model was utilized for predicting compressive strength, tensile strength and flexural strength.
KEYWORDS PVA fiber Cemented soil Compressive strength Tensile strength Flexural strength
1. Introduction In the Huanghe and huaihe area of China, silty soil is the most widely distributed soil type, which is categorized as loose river deposit of Quaternary period (Zhu, 2006). The Portland cement has been used in improving the characteraziton of soil for centuries, while, cement-soil mixture exhibits the characteristic of cement based materials, poor tensile and flexural strength and brittle failure pattern (Ismail et al., 2002; Haeri et al., 2006; Amini and Hamidi, 2014; Consoli et al., 2015). The deep cement mixing (DCM) method has been applied in retaining wall, and the unbraced DCM retaining wall has been used for intermediate excavation due to the decreased construction costs and short construction time. In order to ensure the serviceability and stability in the state of restricted wall thickness, including the maximum horizontal displacement and the flexural performance of cement mixing piles when subjected to lateral pressures (Bergado et al., 1999; Jamsawang et al., 2015; Wonglert and Jongpradist, 2015; Jamsawang et al., 2017), the tensile strength and flexural strength ought to be evaluated. Various fiber types, including steel, synthetic fibers and natural fibers have been demonstrated efficient as reinforcement in improving tensile and flexural strengths of cement based composite (Consoli et al., 1998; Consoli et al.,
CORRESPONDENCE Xiaoqiang Dong ⓒ 2020 Korean Society of Civil Engineers
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2001; Ramakrishna and Sundararajan, 2005; Kundu et al., 2012; Zhou et al., 2013; Gopinath et al., 2014; Onuaguluchi and Banthia, 2016; Pakravan and Ozbakkaloglu, 2019; Liew and Akbar, 2020; Várdaiab et al., 2020). Am
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