再生混凝土抗压性能研究进展

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Abstract In recent years, the rapid development of the city has led to the generation and discharge of a large amount of construction waste. Making recycled aggregate from the construction waste and using it can effectively alleviate the environmental problems caused by the construction waste landfill. In line with China's low-carbon environmental protection, sustainable development of the basic national policy.
The old mortar attached to the surface of recycled aggregate has the characteristics of high porosity and high water absorption, which not only greatly reduces the compactness of recycled concrete, but also affects the hydration process of cement and adversely affects the mechanical properties of recycled concrete. Recycled concrete has a more complex interface transition zone than ordinary concrete due to the existence of old mortar. The author summarizes some scholars' microscopic research on interface transition zone of recycled concrete and reveals the influence of interface transition zone of new and old aggregate mortar on compressive properties of recycled concrete. At the same time, the compressive properties of recycled concrete are analyzed from macro factors such as replacement rate of recycled aggregate, source of recycled aggregate, type of recycled aggregate, water-bearing state of aggregate, preparation and curing process, and the influence law of each factor on compressive strength is summarized. The inferior quality of recycled aggregate leads to the fact that recycled concrete is mostly used in non-structural components at the present stage, which cannot give full play to its economic benefits. In addition, there is no complete system for the application of recycled aggregate in China, and there are no guiding suggestions or specifications from crushing process to aggregate strengthening process. This paper suggested that the preparation of recycled concrete is unfavorable use high replacement ratio, choose high strength waste concrete made of recycled aggregates, within the scope of the cost control to strengthen aggregate, aggregate water-cement ratio changes caused by water absorption, improved through artificial grading, and scientific maintenance way, can make the recycled concrete compressive properties of normal concrete. Finally, the aggregate strengthening method and the formula for predicting compressive strength of recycled concrete are summarized, which lays a theoretical foundation for the practical application of recycled concrete.

Key words： recycled aggregate concrete failure mechanism strength influencing factors aggregate strengthening compressive strength prediction

Published: 05 June 2022 Online: 2022-06-08

CLC number:

TU528

Fund:National Natural Science Foundation of China (51608135, 51978351), Enterprise Technology Innovation Project of Department of Industry and Information Technology of Shandong Province (202060101618,202060103805), and Shandong Taishan Scholars Program (tsqn201909127).

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	Articles by authors
	WANG Junhui
	HUANG Yue
	YANG Guotao
	WEI Qi'an
	LIU Wenzhuo

Cite this article:

WANG Junhui,HUANG Yue,YANG Guotao, et al. Research Progress on Compressive Properties of Recycled Aggregate Concrete[J]. Materials Reports, 2022, 36(Z1): 21100033-9.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2022/V36/IZ1/21100033

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