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Shear strength of clayey sand treated by nanoclay mixed with recycled polyester fiber

纳米黏土与再生聚酯纤维混合处理黏土砂的抗剪强度

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Abstract

The main objective of this study is to investigate the effects of the nanoclay mixed with recycled polyester fiber on the mechanical behavior of soil as a new stabilizer material. To meet this objective, a series of drained direct shear and compaction tests were performed on unreinforced and reinforced soil specimens with three different combinations of the fiber-soil ratios ranging between 0.1% and 0.5%, as well as three different combinations of nanoclay-soil ratios ranging between 0.5% and 1.5% of the soil dry weight. Results indicated that composition of the nanoclay-recycled polyester fiber with the soil improved the friction angle (Φ) by 41% and cohesion (c) by 174%. The soil particles stick together through viscose gel produced by nanoclay. In addition, the rough and wavy surface of the fibers creates a bond and friction between the soil particles and prevents the movement of soil particles, and as a result, the soil strength is increased.

摘要

近年来, 以纳米尺度和纳米颗粒以及定向或随机分布的离散单元(如纤维)来加固土体的材料已 被广泛应用于岩土工程中。本研究的主要目的是研究纳米黏土与再生聚酯纤维混合作为一种新的稳定 材料对土壤力学行为的影响。对于未强化和三种纤维含量介于0.1%和0.5%的强化土壤标本, 以及三 种纳米黏土含量介于0.5%和1.5%的土壤进行排干剪切和压缩测试。结果表明, 纳米黏土-再生聚酯纤 维与土壤混合后, 土壤的抗剪强度提高了41%, 黏聚力提高了174%。此外, 纤维粗糙的波状表面使土 颗粒之间产生粘结和摩擦, 阻止土颗粒的运动, 从而提高土的强度。

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Authors and Affiliations

  1. Department of Civil Engineering, Yasooj Branch, Islamic Azad University, Yasooj, 7591493686, Iran

    Mehrdad Kholghifard & Babak Amini Behbahani

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  1. Mehrdad Kholghifard
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  2. Babak Amini Behbahani
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Correspondence to Mehrdad Kholghifard.

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Contributors

Mehrdad KHOLGHIFARD analyzed the measured data and provided the concept and edited the draft of manuscript. Babak AMINI BEHBAHANI conducted the experiments and wrote the first draft of the manuscript. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

Mehrdad KHOLGHIFARD and Babak AMINI BEHBAHANI declare that they have no conflict of interest.

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Kholghifard, M., Amini Behbahani, B. Shear strength of clayey sand treated by nanoclay mixed with recycled polyester fiber. J. Cent. South Univ. 29, 259–269 (2022). https://doi.org/10.1007/s11771-022-4895-y

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