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Influence of Polyurethane Polymer on the Strength and Mechanical Behavior of Sand-root Composite

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Abstract

Vegetation has good application in slope stabilization, but its beneficial effects on reinforcing topsoil are generally limited by the soil properties it was cultivated in. This study aims at evaluating the strength improvements of sand-root composite by treating with polyurethane polymer and hence investigating the mechanism of polymer-root-soil interactions. Vegetation roots were selected and mixed with dry sand and polymer solution to prepare remolded specimens. A series of experimental tests were then performed at different percentages of root content (0, 0.4, 0.8, 1.2, and 1.6 % by weight of dry sand) and polymer content (1, 2, and 4% by weight of dry sand) to evaluate the shear parameters and unconfined compressive strength (UCS). The combined mechanism was studied by scanning electron microscopy (SEM) images. The results showed that the strengthening effect has greater efficiency with higher polymer content. Through varying contents of vegetation root, it was found that low root content induced an undesirable weakening effect on the strength of the treated soil. However, this situation was somewhat improved with the increase in root content. The good flexibility of polymers not only promote the capacity of soil to energy absorption, but also impart good ductility to soil. The presence of polymers greatly strengthens soil stability due to its special network structure, by which the improved shear resistance at the root-soil interface provides sufficient anchorage effect for the tensile strength of roots to be fully mobilized. Overall, the synergistic effect of root reinforcement and polymer treatment has the potential for its use in soil stabilization.

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Acknowledgement

This research was financially supported by the National Natural Science Foundation of China (Grant No.41472241 & 41877212), Fundamental Research Funds for the Central Universities (Grant No. 2019B17314), Water Conservancy Science and Technology Project of Jiangsu Province, China (Grant No.2017010).

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Authors and Affiliations

  1. School of Earth Sciences and Engineering, Hohai University, Nanjing, 210098, China

    Jin Liu, Zhihao Chen, Zhaojun Zeng, Yuxia Bai, Changqing Qi & Wei Qian

  2. CSIR-Central Building Research Institute (CBRI), Roorkee, 247667, India

    Debi Prasanna Kanungo

Authors
  1. Jin Liu
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  2. Zhihao Chen
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  3. Zhaojun Zeng
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  4. Debi Prasanna Kanungo
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  5. Fan Bu
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  6. Yuxia Bai
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  7. Changqing Qi
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  8. Wei Qian
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Correspondence to Jin Liu.

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Liu, J., Chen, Z., Zeng, Z. et al. Influence of Polyurethane Polymer on the Strength and Mechanical Behavior of Sand-root Composite. Fibers Polym 21, 829–839 (2020). https://doi.org/10.1007/s12221-020-9331-z

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  • DOI: https://doi.org/10.1007/s12221-020-9331-z

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