Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling
The production and microstructure of calcium carbonate are the fundamental indicators to evaluate the effectiveness of Enzyme-induced Carbonate Precipitation (EICP). Soybean urease is extracted, and the urease activity is controlled by the soybean powder concentration in this study. The urease react...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509522009342 |
| _version_ | 1797799006617731072 |
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| author | Jianwei Zhang Yue Yin Wanpeng Shi Danqing Song Lu Yu Lei Shi Zhiguang Han |
| author_facet | Jianwei Zhang Yue Yin Wanpeng Shi Danqing Song Lu Yu Lei Shi Zhiguang Han |
| author_sort | Jianwei Zhang |
| collection | DOAJ |
| description | The production and microstructure of calcium carbonate are the fundamental indicators to evaluate the effectiveness of Enzyme-induced Carbonate Precipitation (EICP). Soybean urease is extracted, and the urease activity is controlled by the soybean powder concentration in this study. The urease reacts with the cementation solution with different concentrations of urea and calcium ions at different temperatures to determine the calcium carbonate production rates (RCC). The crystal sizes of calcium carbonate (SCC) are investigated by scanning electron microscopy (SEM) and image processing method. The RCC increase and subsequently decrease with increasing calcium ion concentration and peak at 0.75 M. A lower urea concentration is more favourable to the formation of CaCO3. Increased urease activity and temperature will lead to an increased RCC and SCC. Some crystals appear as capsules when the temperature goes up. The SCC decreases slightly with increasing calcium ion concentration under low urease activity and increases under high urease activity. The SCC increases first and subsequently decreases with increasing urea concentration under high urease activity, while the effect of urea concentration under low urease activity is not significant. XRD test results show that the calcium carbonate produced in this study is dominated by calcite crystals. The study provides additional data, a useful base to move forward toward a better understanding of the method of stabilization and its applications, for example, the treatment of different soils. |
| first_indexed | 2024-03-13T04:12:27Z |
| format | Article |
| id | doaj.art-55b84f4552a543de81b3f8f6554f59a7 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-13T04:12:27Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-55b84f4552a543de81b3f8f6554f59a72023-06-21T06:53:17ZengElsevierCase Studies in Construction Materials2214-50952023-07-0118e01802Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor couplingJianwei Zhang0Yue Yin1Wanpeng Shi2Danqing Song3Lu Yu4Lei Shi5Zhiguang Han6School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaState Key Laboratory of Hydroscience and Hydropower Engineering, Tsinghua University, Beijing 100091, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaSchool of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China; Corresponding author.School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, ChinaThe production and microstructure of calcium carbonate are the fundamental indicators to evaluate the effectiveness of Enzyme-induced Carbonate Precipitation (EICP). Soybean urease is extracted, and the urease activity is controlled by the soybean powder concentration in this study. The urease reacts with the cementation solution with different concentrations of urea and calcium ions at different temperatures to determine the calcium carbonate production rates (RCC). The crystal sizes of calcium carbonate (SCC) are investigated by scanning electron microscopy (SEM) and image processing method. The RCC increase and subsequently decrease with increasing calcium ion concentration and peak at 0.75 M. A lower urea concentration is more favourable to the formation of CaCO3. Increased urease activity and temperature will lead to an increased RCC and SCC. Some crystals appear as capsules when the temperature goes up. The SCC decreases slightly with increasing calcium ion concentration under low urease activity and increases under high urease activity. The SCC increases first and subsequently decreases with increasing urea concentration under high urease activity, while the effect of urea concentration under low urease activity is not significant. XRD test results show that the calcium carbonate produced in this study is dominated by calcite crystals. The study provides additional data, a useful base to move forward toward a better understanding of the method of stabilization and its applications, for example, the treatment of different soils.http://www.sciencedirect.com/science/article/pii/S2214509522009342Enzyme-induced Carbonate Precipitation (EICP)UreaCalcium chlorideCrystal sizeSoil improvement |
| spellingShingle | Jianwei Zhang Yue Yin Wanpeng Shi Danqing Song Lu Yu Lei Shi Zhiguang Han Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling Case Studies in Construction Materials Enzyme-induced Carbonate Precipitation (EICP) Urea Calcium chloride Crystal size Soil improvement |
| title | Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling |
| title_full | Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling |
| title_fullStr | Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling |
| title_full_unstemmed | Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling |
| title_short | Experimental study on the calcium carbonate production rates and crystal size of EICP under multi-factor coupling |
| title_sort | experimental study on the calcium carbonate production rates and crystal size of eicp under multi factor coupling |
| topic | Enzyme-induced Carbonate Precipitation (EICP) Urea Calcium chloride Crystal size Soil improvement |
| url | http://www.sciencedirect.com/science/article/pii/S2214509522009342 |
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