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Behavior of Compacted Collapsible Soil After Adding Calcium Chloride
https://orcid.org/http://orcid.org/0000-0001-5420-2714
https://orcid.org/http://orcid.org/0000-0002-3064-8575
The collapse behavior of subgrade soil presents stability problems on road construction in collapsible soil region due to its sudden reduction in volume when encountering an increased soil moisture. Compaction is widely accepted as a densifying method for collapsible soil. Recent studies pretreated the loess soils by mixing with chemical agents to obtain an enhanced mechanical behavior. However, studies in stability properties (e.g., under compaction) of chemically modified soils are limited. This study aims to evaluate the behavior of compacted collapsible soils by mixing with chemical agents. This paper presents the first stage results of the study: Behavior of soil treated by calcium chloride (CaCl2) subjected to compaction. Experiments including liquid/plastic limit, oedometer, unconfined compression and hydraulic conductivity tests were conducted to evaluate the engineering behavior of compacted collapsible soil treated at different CaCl2 concentrations. Results indicate that soil treated with higher CaCl2 concentration exhibits an overall enhanced performance in resisting wetting-induced collapse. The addition of CaCl2 could reduce the modified collapse ratio and show less sensitivity to molding water content. Scanning electron microscopy (SEM) was used to visually capture the size of soil aggregates due to enhanced cementation, which was formed by the dual effect of salt concentration and compaction effort. Unconfined compression strength (UCS) of treated soils generally increases with increasing water content at dry of optimum conditions and decreases as water content increases toward wet of optimum conditions. The preparation method for sampling soil from compaction has an essential influence on the measured soil strength. Hydraulic conductivity decreases with increasing CaCl2 concentration. Studies on the mechanism of cementation in compacted collapsible soil treated by chemical agents are ongoing.
Behavior of Compacted Collapsible Soil After Adding Calcium Chloride
https://orcid.org/http://orcid.org/0000-0001-5420-2714
https://orcid.org/http://orcid.org/0000-0002-3064-8575
The collapse behavior of subgrade soil presents stability problems on road construction in collapsible soil region due to its sudden reduction in volume when encountering an increased soil moisture. Compaction is widely accepted as a densifying method for collapsible soil. Recent studies pretreated the loess soils by mixing with chemical agents to obtain an enhanced mechanical behavior. However, studies in stability properties (e.g., under compaction) of chemically modified soils are limited. This study aims to evaluate the behavior of compacted collapsible soils by mixing with chemical agents. This paper presents the first stage results of the study: Behavior of soil treated by calcium chloride (CaCl2) subjected to compaction. Experiments including liquid/plastic limit, oedometer, unconfined compression and hydraulic conductivity tests were conducted to evaluate the engineering behavior of compacted collapsible soil treated at different CaCl2 concentrations. Results indicate that soil treated with higher CaCl2 concentration exhibits an overall enhanced performance in resisting wetting-induced collapse. The addition of CaCl2 could reduce the modified collapse ratio and show less sensitivity to molding water content. Scanning electron microscopy (SEM) was used to visually capture the size of soil aggregates due to enhanced cementation, which was formed by the dual effect of salt concentration and compaction effort. Unconfined compression strength (UCS) of treated soils generally increases with increasing water content at dry of optimum conditions and decreases as water content increases toward wet of optimum conditions. The preparation method for sampling soil from compaction has an essential influence on the measured soil strength. Hydraulic conductivity decreases with increasing CaCl2 concentration. Studies on the mechanism of cementation in compacted collapsible soil treated by chemical agents are ongoing.
Behavior of Compacted Collapsible Soil After Adding Calcium Chloride
https://orcid.org/http://orcid.org/0000-0001-5420-2714
https://orcid.org/http://orcid.org/0000-0002-3064-8575
The collapse behavior of subgrade soil presents stability problems on road construction in collapsible soil region due to its sudden reduction in volume when encountering an increased soil moisture. Compaction is widely accepted as a densifying method for collapsible soil. Recent studies pretreated the loess soils by mixing with chemical agents to obtain an enhanced mechanical behavior. However, studies in stability properties (e.g., under compaction) of chemically modified soils are limited. This study aims to evaluate the behavior of compacted collapsible soils by mixing with chemical agents. This paper presents the first stage results of the study: Behavior of soil treated by calcium chloride (CaCl2) subjected to compaction. Experiments including liquid/plastic limit, oedometer, unconfined compression and hydraulic conductivity tests were conducted to evaluate the engineering behavior of compacted collapsible soil treated at different CaCl2 concentrations. Results indicate that soil treated with higher CaCl2 concentration exhibits an overall enhanced performance in resisting wetting-induced collapse. The addition of CaCl2 could reduce the modified collapse ratio and show less sensitivity to molding water content. Scanning electron microscopy (SEM) was used to visually capture the size of soil aggregates due to enhanced cementation, which was formed by the dual effect of salt concentration and compaction effort. Unconfined compression strength (UCS) of treated soils generally increases with increasing water content at dry of optimum conditions and decreases as water content increases toward wet of optimum conditions. The preparation method for sampling soil from compaction has an essential influence on the measured soil strength. Hydraulic conductivity decreases with increasing CaCl2 concentration. Studies on the mechanism of cementation in compacted collapsible soil treated by chemical agents are ongoing.
Behavior of Compacted Collapsible Soil After Adding Calcium Chloride
Lecture Notes in Civil Engineering
Tutumluer, Erol (editor) / Nazarian, Soheil (editor) / Al-Qadi, Imad (editor) / Qamhia, Issam I.A. (editor) / Geng, Weijuan (author) / Zhou, Weiyang (author) / Liu, Jiankun (author)
2021-08-31
13 pages
Article/Chapter (Book)
Electronic Resource
English
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