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Combined Effect of Biopolymer and Fiber Inclusions on Unconfined Compressive Strength of Soft Soil

The utilizing of traditional chemical stabilizers could improve soil engineering properties but also results in brittle behavior and causes environmental problems. This study investigates the feasibility of the combined utilization of an ecofriendly biopolymer and fiber inclusions as an alternative...

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Autores principales: Chen, Chunhui, Wei, Kai, Gu, Jiayu, Huang, Xiaoyang, Dai, Xianyao, Liu, Qingbing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8878227/
https://www.ncbi.nlm.nih.gov/pubmed/35215698
http://dx.doi.org/10.3390/polym14040787
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author Chen, Chunhui
Wei, Kai
Gu, Jiayu
Huang, Xiaoyang
Dai, Xianyao
Liu, Qingbing
author_facet Chen, Chunhui
Wei, Kai
Gu, Jiayu
Huang, Xiaoyang
Dai, Xianyao
Liu, Qingbing
author_sort Chen, Chunhui
collection PubMed
description The utilizing of traditional chemical stabilizers could improve soil engineering properties but also results in brittle behavior and causes environmental problems. This study investigates the feasibility of the combined utilization of an ecofriendly biopolymer and fiber inclusions as an alternative to traditional cement for reinforcing soft soil. A series of unconfined compression tests were conducted to examine the combined effect of the biopolymer and fibers on the stress–strain characteristics, strength improvement, failure pattern, and reinforcement mechanism of soft soil. The results show that the biopolymer associated with fibers has an unconfined compressive strength similar to that of fiber-reinforced soil. However, it then increases with different curing times and conditions, which can be up to 1.5 MPa–2.5 MPa. The combined effect of fibers and the biopolymer is not simply equivalent to the sum of the effects of each individual material. The fiber shows its role instantly after being mixed into soil, whereas the effect of biopolymer gradually appears with sample curing time. The biopolymer plays a dominant role in increasing the peak unconfined compressive strength and brittleness of soil, while the amount of fiber is crucial for reducing soil brittleness and increasing ductility. It is shown that the biopolymer not only contributes to the particle bonding force but also facilitates the reinforcement efficiency of fibers in the soil. The fibers in return assist in reducing the soil brittleness arising from biopolymer cementation and provide residual resistance after post-peak failure.
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spelling pubmed-88782272022-02-26 Combined Effect of Biopolymer and Fiber Inclusions on Unconfined Compressive Strength of Soft Soil Chen, Chunhui Wei, Kai Gu, Jiayu Huang, Xiaoyang Dai, Xianyao Liu, Qingbing Polymers (Basel) Article The utilizing of traditional chemical stabilizers could improve soil engineering properties but also results in brittle behavior and causes environmental problems. This study investigates the feasibility of the combined utilization of an ecofriendly biopolymer and fiber inclusions as an alternative to traditional cement for reinforcing soft soil. A series of unconfined compression tests were conducted to examine the combined effect of the biopolymer and fibers on the stress–strain characteristics, strength improvement, failure pattern, and reinforcement mechanism of soft soil. The results show that the biopolymer associated with fibers has an unconfined compressive strength similar to that of fiber-reinforced soil. However, it then increases with different curing times and conditions, which can be up to 1.5 MPa–2.5 MPa. The combined effect of fibers and the biopolymer is not simply equivalent to the sum of the effects of each individual material. The fiber shows its role instantly after being mixed into soil, whereas the effect of biopolymer gradually appears with sample curing time. The biopolymer plays a dominant role in increasing the peak unconfined compressive strength and brittleness of soil, while the amount of fiber is crucial for reducing soil brittleness and increasing ductility. It is shown that the biopolymer not only contributes to the particle bonding force but also facilitates the reinforcement efficiency of fibers in the soil. The fibers in return assist in reducing the soil brittleness arising from biopolymer cementation and provide residual resistance after post-peak failure. MDPI 2022-02-17 /pmc/articles/PMC8878227/ /pubmed/35215698 http://dx.doi.org/10.3390/polym14040787 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chen, Chunhui
Wei, Kai
Gu, Jiayu
Huang, Xiaoyang
Dai, Xianyao
Liu, Qingbing
Combined Effect of Biopolymer and Fiber Inclusions on Unconfined Compressive Strength of Soft Soil
title Combined Effect of Biopolymer and Fiber Inclusions on Unconfined Compressive Strength of Soft Soil
title_full Combined Effect of Biopolymer and Fiber Inclusions on Unconfined Compressive Strength of Soft Soil
title_fullStr Combined Effect of Biopolymer and Fiber Inclusions on Unconfined Compressive Strength of Soft Soil
title_full_unstemmed Combined Effect of Biopolymer and Fiber Inclusions on Unconfined Compressive Strength of Soft Soil
title_short Combined Effect of Biopolymer and Fiber Inclusions on Unconfined Compressive Strength of Soft Soil
title_sort combined effect of biopolymer and fiber inclusions on unconfined compressive strength of soft soil
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8878227/
https://www.ncbi.nlm.nih.gov/pubmed/35215698
http://dx.doi.org/10.3390/polym14040787
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