Experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powder
Enzyme induced carbonate precipitation (EICP) is gaining more and more recognition that can be utilized on-site to enhance the quality of the weak soil. In this experimental study, a novel approach that combines EICP and eggshell powder (ESP) to strengthen the engineering characteristics of natural...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-02-01
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| Series: | Soils and Foundations |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0038080625000010 |
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| author | Mudassir Mehmood Yuancheng Guo Yunlong Liu Lei Wang Wen Nie Bantayehu Uba Uge Sharafat Ali Chen Xuanyu Yingao Zhao |
| author_facet | Mudassir Mehmood Yuancheng Guo Yunlong Liu Lei Wang Wen Nie Bantayehu Uba Uge Sharafat Ali Chen Xuanyu Yingao Zhao |
| author_sort | Mudassir Mehmood |
| collection | DOAJ |
| description | Enzyme induced carbonate precipitation (EICP) is gaining more and more recognition that can be utilized on-site to enhance the quality of the weak soil. In this experimental study, a novel approach that combines EICP and eggshell powder (ESP) to strengthen the engineering characteristics of natural expansive soil has been implemented. The engineering properties of expansive soil were examined using the environmentally friendly method EICP with an optimal 0.75 mol/L concentration and 14% ESP optimal content, with varying curing durations. ESP serves as a filler between particles and also a nucleation site to promote the precipitation of calcium carbonate. A thorough examination of the soil’s microstructure development after treatment was additionally executed through scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The findings demonstrated that combining EICP and ESP decreases the swelling pressure about 25 times, compared with the individual treatment that yielded 5 and 1.5 times reduction for EICP and ESP, respectively. Additionally, the combined treatment led to an increase in the unconfined compressive strength, cohesion, internal friction angle, unsoaked CBR, and soaked CBR by 3, 1.6, 1.8, 8.0, and 9.5 times, respectively, indicating better enhancements than the individual treatments of EICP and ESP. Moreover, at the microstructural level, SEM imagery demonstrated a highly reinforced soil composite. The XRD analysis unveils distinct mineralogical changes, predominantly characterized by enhanced calcite formation and a refined microstructural composition. This study highlights the synergistic potential of combining EICP and ESP as stabilizing additives to enhance the engineering properties of expansive soil. Beyond soil enhancement, this innovative blend offers a sustainable solution by repurposing agrowaste. The mutual incorporation of EICP and ESP emerges as a promising strategy for advancing sustainable civil infrastructure development. |
| format | Article |
| id | doaj-art-63d6aaf14425423d8ca2caea47071360 |
| institution | Kabale University |
| issn | 2524-1788 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Soils and Foundations |
| spelling | doaj-art-63d6aaf14425423d8ca2caea470713602025-01-19T06:23:48ZengElsevierSoils and Foundations2524-17882025-02-01651101567Experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powderMudassir Mehmood0Yuancheng Guo1Yunlong Liu2Lei Wang3Wen Nie4Bantayehu Uba Uge5Sharafat Ali6Chen Xuanyu7Yingao Zhao8School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China; State Key Laboratory of Safety and Health for Metal Mines, Maanshan, Anhui 243000, China; School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, ChinaSchool of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China; Corresponding author.School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, ChinaState Key Laboratory of Safety and Health for Metal Mines, Maanshan, Anhui 243000, China; School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, ChinaSchool of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China; School of Civil Engineering, Hawassa University, Hawassa, EthiopiaCollege of Civil Engineering and Architecture, Henan University of Technology, Henan, ChinaSchool of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, ChinaSchool of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, ChinaEnzyme induced carbonate precipitation (EICP) is gaining more and more recognition that can be utilized on-site to enhance the quality of the weak soil. In this experimental study, a novel approach that combines EICP and eggshell powder (ESP) to strengthen the engineering characteristics of natural expansive soil has been implemented. The engineering properties of expansive soil were examined using the environmentally friendly method EICP with an optimal 0.75 mol/L concentration and 14% ESP optimal content, with varying curing durations. ESP serves as a filler between particles and also a nucleation site to promote the precipitation of calcium carbonate. A thorough examination of the soil’s microstructure development after treatment was additionally executed through scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The findings demonstrated that combining EICP and ESP decreases the swelling pressure about 25 times, compared with the individual treatment that yielded 5 and 1.5 times reduction for EICP and ESP, respectively. Additionally, the combined treatment led to an increase in the unconfined compressive strength, cohesion, internal friction angle, unsoaked CBR, and soaked CBR by 3, 1.6, 1.8, 8.0, and 9.5 times, respectively, indicating better enhancements than the individual treatments of EICP and ESP. Moreover, at the microstructural level, SEM imagery demonstrated a highly reinforced soil composite. The XRD analysis unveils distinct mineralogical changes, predominantly characterized by enhanced calcite formation and a refined microstructural composition. This study highlights the synergistic potential of combining EICP and ESP as stabilizing additives to enhance the engineering properties of expansive soil. Beyond soil enhancement, this innovative blend offers a sustainable solution by repurposing agrowaste. The mutual incorporation of EICP and ESP emerges as a promising strategy for advancing sustainable civil infrastructure development.http://www.sciencedirect.com/science/article/pii/S0038080625000010Enzymes induced carbonate precipitationEggshell powderExpansive soil stabilizationMicroscopic changes |
| spellingShingle | Mudassir Mehmood Yuancheng Guo Yunlong Liu Lei Wang Wen Nie Bantayehu Uba Uge Sharafat Ali Chen Xuanyu Yingao Zhao Experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powder Soils and Foundations Enzymes induced carbonate precipitation Eggshell powder Expansive soil stabilization Microscopic changes |
| title | Experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powder |
| title_full | Experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powder |
| title_fullStr | Experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powder |
| title_full_unstemmed | Experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powder |
| title_short | Experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powder |
| title_sort | experimental study on the engineering characteristics of expansive soil improved conjointly using enzyme induced carbonate precipitation and eggshell powder |
| topic | Enzymes induced carbonate precipitation Eggshell powder Expansive soil stabilization Microscopic changes |
| url | http://www.sciencedirect.com/science/article/pii/S0038080625000010 |
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