Experimental Investigation on Carbonation Behavior in Lime-Stabilized Expansive Soil
The carbonation behavior of lime-stabilized expansive soil is important for assessing the stabilization efficiency from the perspective of durability. In this study, the accelerated carbonation tests, measurement of pH value distribution, and the free swell ratio tests were conducted to investigate...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/7865469 |
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| author | Long Xu Fusheng Zha Congmin Liu Bo Kang Jingjing Liu Chuang Yu |
| author_facet | Long Xu Fusheng Zha Congmin Liu Bo Kang Jingjing Liu Chuang Yu |
| author_sort | Long Xu |
| collection | DOAJ |
| description | The carbonation behavior of lime-stabilized expansive soil is important for assessing the stabilization efficiency from the perspective of durability. In this study, the accelerated carbonation tests, measurement of pH value distribution, and the free swell ratio tests were conducted to investigate the evolutions of carbonation depth, carbonation extent, and expansive potential of lime-stabilized expansive soil. XRD, MIP, and SEM techniques were adopted as supplements to reveal the carbonation mechanism. Results demonstrated that the carbonation depth of lime-stabilized expansive soil increased significantly as time elapsed; however, the rate of increase reduced when the carbonation time increased. Higher carbonation depth was obtained at higher temperature and CO2 concentration and lower relative humidity, which was described by an empirical model. Fully, partly, and noncarbonated zones were subsequently presented with an increase in the depth of the soil. The expansive potential of lime-stabilized expansive soil was partially recovered during carbonation. The obtained linear relationships between the free swell ratio and pH value were adopted to describe the evolution of expansive behavior with carbonation time and depth. In microstructural analysis, the conversion of portlandite into calcium carbonate was significant, which resulted in changes in microstructure and controlled the carbonation behavior. |
| format | Article |
| id | doaj-art-8d797e26374b4e69bca3e7dc2baeff0e |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-8d797e26374b4e69bca3e7dc2baeff0e2025-02-03T06:45:47ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/78654697865469Experimental Investigation on Carbonation Behavior in Lime-Stabilized Expansive SoilLong Xu0Fusheng Zha1Congmin Liu2Bo Kang3Jingjing Liu4Chuang Yu5School of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, ChinaSchool of Resource and Environmental Engineering, Hefei University of Technology, Hefei 230009, ChinaCollege of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, ChinaThe carbonation behavior of lime-stabilized expansive soil is important for assessing the stabilization efficiency from the perspective of durability. In this study, the accelerated carbonation tests, measurement of pH value distribution, and the free swell ratio tests were conducted to investigate the evolutions of carbonation depth, carbonation extent, and expansive potential of lime-stabilized expansive soil. XRD, MIP, and SEM techniques were adopted as supplements to reveal the carbonation mechanism. Results demonstrated that the carbonation depth of lime-stabilized expansive soil increased significantly as time elapsed; however, the rate of increase reduced when the carbonation time increased. Higher carbonation depth was obtained at higher temperature and CO2 concentration and lower relative humidity, which was described by an empirical model. Fully, partly, and noncarbonated zones were subsequently presented with an increase in the depth of the soil. The expansive potential of lime-stabilized expansive soil was partially recovered during carbonation. The obtained linear relationships between the free swell ratio and pH value were adopted to describe the evolution of expansive behavior with carbonation time and depth. In microstructural analysis, the conversion of portlandite into calcium carbonate was significant, which resulted in changes in microstructure and controlled the carbonation behavior.http://dx.doi.org/10.1155/2020/7865469 |
| spellingShingle | Long Xu Fusheng Zha Congmin Liu Bo Kang Jingjing Liu Chuang Yu Experimental Investigation on Carbonation Behavior in Lime-Stabilized Expansive Soil Advances in Civil Engineering |
| title | Experimental Investigation on Carbonation Behavior in Lime-Stabilized Expansive Soil |
| title_full | Experimental Investigation on Carbonation Behavior in Lime-Stabilized Expansive Soil |
| title_fullStr | Experimental Investigation on Carbonation Behavior in Lime-Stabilized Expansive Soil |
| title_full_unstemmed | Experimental Investigation on Carbonation Behavior in Lime-Stabilized Expansive Soil |
| title_short | Experimental Investigation on Carbonation Behavior in Lime-Stabilized Expansive Soil |
| title_sort | experimental investigation on carbonation behavior in lime stabilized expansive soil |
| url | http://dx.doi.org/10.1155/2020/7865469 |
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