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Reinforcement of Recycled Aggregate by Microbial-Induced Mineralization and Deposition of Calcium Carbonate—Influencing Factors, Mechanism and Effect of Reinforcement

School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
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Academic Editors: Hamed Khodadadi Tirkolaei, Satoru Kawasaki, Liang Cheng, Leon van Paassen and José L. Arias
Crystals 2021, 11(8), 887; https://doi.org/10.3390/cryst11080887
Received: 29 June 2021 / Revised: 24 July 2021 / Accepted: 26 July 2021 / Published: 30 July 2021
Recycled aggregate is aggregate prepared from construction waste. With the development of a global economy and people’s attention to sustainable development, recycled aggregate has shown advantages in replacing natural aggregate in the production of concrete due to its environmental friendliness, low energy consumption, and low cost. Recycled aggregate exhibits high water absorption and a multi-interface transition zone, which limits its application scope. Researchers have used various methods to improve the properties of recycled aggregate, such as microbially induced calcium carbonate precipitation (MICP) technology. In this paper, the results of recent studies on the reinforcement of recycled aggregate by MICP technology are synthesized, and the factors affecting the strengthening effect of recycled aggregate are reviewed. Moreover, the strengthening mechanism, advantages and disadvantages of MICP technology are summarized. After the modified treatment, the aggregate performance is significantly improved. Regardless of whether the aggregate was used in mortar or concrete, the mechanical properties of the specimens were clearly improved. However, there are some issues regarding the application of MICP technology, such as the use of an expensive culture medium, a long modification cycle, and untargeted mineralization deposition. These difficulties need to be overcome in the future for the industrialization of regenerated aggregate materials via MICP technology. View Full-Text
Keywords: recycled aggregate; biomineralization; sustainability; reinforcement; recycled concrete recycled aggregate; biomineralization; sustainability; reinforcement; recycled concrete
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MDPI and ACS Style

Feng, C.; Cui, B.; Ge, H.; Huang, Y.; Zhang, W.; Zhu, J. Reinforcement of Recycled Aggregate by Microbial-Induced Mineralization and Deposition of Calcium Carbonate—Influencing Factors, Mechanism and Effect of Reinforcement. Crystals 2021, 11, 887. https://doi.org/10.3390/cryst11080887

AMA Style

Feng C, Cui B, Ge H, Huang Y, Zhang W, Zhu J. Reinforcement of Recycled Aggregate by Microbial-Induced Mineralization and Deposition of Calcium Carbonate—Influencing Factors, Mechanism and Effect of Reinforcement. Crystals. 2021; 11(8):887. https://doi.org/10.3390/cryst11080887

Chicago/Turabian Style

Feng, Chunhua, Buwen Cui, Haidong Ge, Yihong Huang, Wenyan Zhang, and Jianping Zhu. 2021. "Reinforcement of Recycled Aggregate by Microbial-Induced Mineralization and Deposition of Calcium Carbonate—Influencing Factors, Mechanism and Effect of Reinforcement" Crystals 11, no. 8: 887. https://doi.org/10.3390/cryst11080887

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