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Study on Mechanical Properties of Permeable Polymer Treated Loess

The reinforcement and durability of loess are of great importance for road performance. In this study, a self-designed grouting system and newly permeable polymers were adopted to investigate the mechanical properties and durability of solidified loess (SL), considering different dry densities and w...

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Autores principales: Zhao, Weifan, Guo, Chengchao, Wang, Chaojie, Wang, Yuke, Wang, Lina
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9572338/
https://www.ncbi.nlm.nih.gov/pubmed/36233991
http://dx.doi.org/10.3390/ma15196647
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author Zhao, Weifan
Guo, Chengchao
Wang, Chaojie
Wang, Yuke
Wang, Lina
author_facet Zhao, Weifan
Guo, Chengchao
Wang, Chaojie
Wang, Yuke
Wang, Lina
author_sort Zhao, Weifan
collection PubMed
description The reinforcement and durability of loess are of great importance for road performance. In this study, a self-designed grouting system and newly permeable polymers were adopted to investigate the mechanical properties and durability of solidified loess (SL), considering different dry densities and water contents. The unconfined compression test and piezocone penetration (CPTU) test were used to examine the mechanical properties. The mechanism of the loess solidified by permeable polymer was analyzed from the micro-level by SEM, MIP, and XRD tests. The test results show that the effect of polymer grouting is obvious, the unconfined compressive strength (UCS) of the SL after grouting is as high as 3.05–5.42 MPa; it is 11.83–20.99 times that of unsolidified loess (UL). The UCS of the SL after grouting is inversely proportional to the dry densities and water contents. After 56 days of immersion, the SL still shows a high compressive strength. The additional erosion of the SL was not caused by the salt solution; the durability is significantly better than that of cement mixing soil. The sensitivity of various factors on the UCS of the SL are service environment > water content > dry density. The SEM tests clearly show that the gel formed by the reaction of the polymer with water on the surface of soil particles makes the bond of soil particles tighter. It can be observed from the MIP test that the cumulative mercury of SL was 0.115 mL/g, which was 33.72% of UL (0.341 mL/g), and the cumulative mercury of SL after immersion in water and salt solutions was 0.183 mL/g and 0.175 mL/g, which was 53.7% and 51.3% of UL (0.341 mL/g), respectively. The XRD results show that there are no other new mineral components produced after grouting and the spacing between crystalline planes decreases, which proves that permeable polymer grouting makes the soil denser and does not erode the soil particles.
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spelling pubmed-95723382022-10-17 Study on Mechanical Properties of Permeable Polymer Treated Loess Zhao, Weifan Guo, Chengchao Wang, Chaojie Wang, Yuke Wang, Lina Materials (Basel) Article The reinforcement and durability of loess are of great importance for road performance. In this study, a self-designed grouting system and newly permeable polymers were adopted to investigate the mechanical properties and durability of solidified loess (SL), considering different dry densities and water contents. The unconfined compression test and piezocone penetration (CPTU) test were used to examine the mechanical properties. The mechanism of the loess solidified by permeable polymer was analyzed from the micro-level by SEM, MIP, and XRD tests. The test results show that the effect of polymer grouting is obvious, the unconfined compressive strength (UCS) of the SL after grouting is as high as 3.05–5.42 MPa; it is 11.83–20.99 times that of unsolidified loess (UL). The UCS of the SL after grouting is inversely proportional to the dry densities and water contents. After 56 days of immersion, the SL still shows a high compressive strength. The additional erosion of the SL was not caused by the salt solution; the durability is significantly better than that of cement mixing soil. The sensitivity of various factors on the UCS of the SL are service environment > water content > dry density. The SEM tests clearly show that the gel formed by the reaction of the polymer with water on the surface of soil particles makes the bond of soil particles tighter. It can be observed from the MIP test that the cumulative mercury of SL was 0.115 mL/g, which was 33.72% of UL (0.341 mL/g), and the cumulative mercury of SL after immersion in water and salt solutions was 0.183 mL/g and 0.175 mL/g, which was 53.7% and 51.3% of UL (0.341 mL/g), respectively. The XRD results show that there are no other new mineral components produced after grouting and the spacing between crystalline planes decreases, which proves that permeable polymer grouting makes the soil denser and does not erode the soil particles. MDPI 2022-09-25 /pmc/articles/PMC9572338/ /pubmed/36233991 http://dx.doi.org/10.3390/ma15196647 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
Zhao, Weifan
Guo, Chengchao
Wang, Chaojie
Wang, Yuke
Wang, Lina
Study on Mechanical Properties of Permeable Polymer Treated Loess
title Study on Mechanical Properties of Permeable Polymer Treated Loess
title_full Study on Mechanical Properties of Permeable Polymer Treated Loess
title_fullStr Study on Mechanical Properties of Permeable Polymer Treated Loess
title_full_unstemmed Study on Mechanical Properties of Permeable Polymer Treated Loess
title_short Study on Mechanical Properties of Permeable Polymer Treated Loess
title_sort study on mechanical properties of permeable polymer treated loess
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9572338/
https://www.ncbi.nlm.nih.gov/pubmed/36233991
http://dx.doi.org/10.3390/ma15196647
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