| MATERIALS AND SUSTAINABLE DEVEL OPMENT: MATERIALS REMANUFACTURING AND WASTE RECYCLING |
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| Review on Enhancement Methods of Recycled Aggregate |
| WANG Yasi1,2,3, ZHENG Jianlan1,2,3, YOU Fan1,2,3
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1 College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
2 College of Engineering, Fujian Jiangxia University, Fuzhou 350108, China
3 Coordinative Innovation Center for Environmentally Friendly and Energy Saving HPC of Fujian Province, Fuzhou 350108, China |
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Abstract Recycled aggregate concrete, as a new environmental protection material, meets the strategy of saving resources and energy, reducing environmental pollution and sustainable development. It is the main research and promotion direction of green concrete. The surface of recycled aggregate is adhered to old cement mortar, rough and angular, and contains a large number of holes and microcracks during secondary crushing. Compared with natural aggregate, recycled aggregate has some shortcomings, such as low density, high water absorption, large crushing index, poor firmness and large dispersion, and there is a weak interface between recycled aggregate and adhered mortar, which affect the performance of recycled aggregate concrete and restrict its application in practical engineering. So improving the performance of recycled aggregate is one of the key problems in the research of recycled aggregate concrete.
The existing methods to improve the performance of recycled aggregate concrete mainly focus on the mixing method, adding mineral admixtures and optimizing the mix of concrete in the mixing stage, or by optimizing the gradation of recycled aggregate and reducing the replacement rate of recycled aggregate to reduce the adverse effect of recycled aggregate. However, the defect of recycled aggregate has not been substantially improved. The performance of recycled aggregate can be improved by enhancement treatments.
The enhancement treatments mainly start with the mortar attached, and remove or enhance the old mortar by physical, chemical or biological methods, so as to enhance the performance of recycled aggregate, such as mechanical grinding, pre-soaking in pozzolanic solution, nanomate-rial slurry, carbonation, et al. In addition, the component recombination method can also improve the performance of recycled aggregates, and thus improve the performance of recycled aggregate concrete.
In this paper, the research progress and their mechanism of each recycled aggregate enhancing methods at home and abroad were summarized, the strengthening effect of enhancement methods were analyzed, and the direction of further research on enhancing of recycled aggregate was put forward.
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Published: 12 March 2021
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| Fund:Joint Funds of the National Natural Science Foundation of China (U1605242), the Natural Science Foundation of Fujian Province (2020J01941), the thematic research foundation of Fujian Jiangxia University (JXZ2018010). |
About author:: Jianlan Zheng, professor, Ph.D., doctoral supervisor of Fuzhou University, secretary of Fujian Jiangxia University, National Ten Million Talents Project Personnel, Outstanding Science and Technology Talents of Fujian Province, Leading Talents of Science and Technology Innovation of Fujian Province, Experts with Special Allowances of the State Council, Excellent Teachers of National Colleges and Universities of the Ministry of Education. He has been engaged in the research and development of structural engineering and modern concrete materials for a long time, and has trained doctoral and master’s students. In recent years, the research and application of self-compacting high-performance concrete and its structure, the research and application of volume stability of high-strength and high-performance concrete and recycled aggregate concrete, and the resource utilization of construction waste have been carried out systematically and tho-roughly. He has won one second prize for technological invention, four second prizes for science and technology in Fujian Province as the first accomplishor, four industry standards for China Civil Engineering Society and Fujian Engineering Construction, two patents for invention authorized by the state, and more than 100 academic papers and monographs published.
>Yasi Wang received her master’s degree from Fuzhou University in June 2014. She is currently pursuing her Ph.D. at the College of Civil Engineering, Fuzhou University, under the guidance of Professor Zheng Jianlan. Her research interest is recycled aggregate concrete. |
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