| MATERIALS AND SUSTAINABLE DEVELOPMENT: MATERIALS REMANUFACTURING AND WASTE RECYCLING |
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| Microbially Induced Calcium Carbonate Precipitation Strengthening Recycled Coarse Aggregate with Core-shell Structure |
| XIE Dengmin1,2, QIAN Chunxiang1,2, ZHANG Xiao1,2
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1 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2 Research Center of Green Building and Construction Materials, Southeast University, Nanjing 211189, China |
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Abstract In order to achieve the efficient utilization of waste concrete sand and powder, using waste sand as the core, waste powder and a small amount of cementing material as the shell material, cold-bonding technology is used to prepare recycled coarse aggregates with core-shell structure, and microbially induced calcium carbonate precipitation (MICP) is integrated with the purpose of strength enhancement. This paper studies the effects of mineralization time, calcium ion concentration on the core mass gain and water absorption, the amount of cementitious material on the granulation rate, and the content of microbial mineralizer on the properties of recycled coarse aggregate, SEM and TG-DTG were used to analyze the morphology and phase content of recycled coarse aggregate. Experimental results indicate that mineralized microorganisms can accelerate and induce calcium carbonate deposition, and significantly improve the quality of recycled coarse aggregates. When the content of microbial mineralizer is 1.0%, the crushing index of recycled coarse aggregates, water absorption, content of fine powder and soundness decreased by 50.0%, 21.2%, 50.0%, and 15.3%, and the apparent density increased by 2.8%, the shell calcium hydroxide was completely mineralized, and the calcium carbonate content increased to 24.18%.
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Published: 19 January 2021
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| Fund:This work was financially supported by the National Natural Science Foundation of China (5173000002). |
About author:: Dengmin Xie, School of Materials Science and Engineering, Southeast University, master candidate. Her research interest is utilization of solid waste.
Xiao Zhang, School of Materials Science and Engineering, Southeast university, Ph. D. candidate. His research interests are solid waste recycling, industrial waste disposal and cement-based fast repair materials. 3 papers and 1 patent have been published.
Chunxiang Qian received her Ph.D. degree in Nanjing Tech University in 1992. She is currently a Professor in Southeast University, and director of Research Center on Gree Building and Construction Materials. Her research interests are high performance and bacterial smart concrete; bio-cement; low-carbon cementitious materials and green energy saving building materials. She has more than 30 inventions that are patented and has published 6 books and more than 210 journal articles and conference papers. |
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2021, Vol. 35 
