Review on Enhancement Methods of Recycled Aggregate
WANG Yasi1,2,3, ZHENG Jianlan1,2,3, YOU Fan1,2,3
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
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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2021, Vol. 35 
