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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| Format: | Article |
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MDPI AG
2022-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/19/6647 |
| _version_ | 1797478414135853056 |
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| author | Weifan Zhao Chengchao Guo Chaojie Wang Yuke Wang Lina Wang |
| author_facet | Weifan Zhao Chengchao Guo Chaojie Wang Yuke Wang Lina Wang |
| author_sort | Weifan Zhao |
| collection | DOAJ |
| 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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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T21:31:34Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-87d40a2f0f9d4e2fbdd3a08ec4683f4d2023-11-23T20:54:23ZengMDPI AGMaterials1996-19442022-09-011519664710.3390/ma15196647Study on Mechanical Properties of Permeable Polymer Treated LoessWeifan Zhao0Chengchao Guo1Chaojie Wang2Yuke Wang3Lina Wang4College of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaCollege of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaCollege of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaCollege of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaCollege of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, ChinaThe 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.https://www.mdpi.com/1996-1944/15/19/6647groutingpermeable polymerloessmechanical propertiesdurabilitymicroscopic tests |
| spellingShingle | Weifan Zhao Chengchao Guo Chaojie Wang Yuke Wang Lina Wang Study on Mechanical Properties of Permeable Polymer Treated Loess Materials grouting permeable polymer loess mechanical properties durability microscopic tests |
| 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 | grouting permeable polymer loess mechanical properties durability microscopic tests |
| url | https://www.mdpi.com/1996-1944/15/19/6647 |
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