再生微粉性能激活研究及应用进展

doi:10.11896/cldb.22100042

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Abstract Recycled fine powders area kind of particles with particle size less than 75 μm produced in the process of preparing recycled aggregate from construction waste with concrete, brick and tile as the main components. Their main chemical composition is similar to that of fly ash and has certain potential activity. The use of recycled fine powders as admixture can reduce the demand for raw materials, reduce the pollution to the environment, and realize the recycling of resources.
Recycled fine powders have the characteristics of complex composition, large water demand and low activity index, which are not conducive to the performance of mortar or concrete when used directly as admixture. However, the content of SiO₂, CaO and Al₂O₃ in recycled fine powders are high, which have a good activity potential. After appropriate technical treatment, it can effectively stimulate their activities and improve the utilization efficiency. The main activation modes of recycled fine powders currently include physical, chemical, and thermal activation. Thermal activation can burn up the organic impurities in the recycled fine powders, and change the composition of some substances, so as to stimulate their activity. Physical activation increases the specific surface area of recycled fine powders by mechanical force, thereby improving the activity of the recycled fine powders. Chemical activation mainly provides an alkaline environment or ions that can participate in the reaction by adding alkaline activators, thus promoting the hydration degree to improve the activity of recycled fine powders. Relevant scholars have conducted in-depth research on the active excitation method of recycled fine powders and its application in mortar and concrete, which has played a positive role in the application of recycled fine powders.
Based on the existing literature, this paper comprehensively reviews the physical properties, chemical composition, activation mode, activation mechanism and application status of recycled fine powders, analyses the problems in the current research of recycled fine powders and looks forward to their application prospect, in order to provide a research basis for the high-quality utilization of recycled fine powders.

Key words： construction waste recycled fine powders activation mode mechanism of action application status

Published: 25 May 2024 Online: 2024-05-28

CLC number:

TU526

Fund:Key Research and Development Projects of Changsha Science and Technology Plan (kh2005213).

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	Articles by authors
	MA Kunlin
	MENG Weiqi
	SHEN Jingtao
	HU Mingwen
	WANG Xiaojie
	LONG Guangcheng
	ZENG Xiaohui

Cite this article:

MA Kunlin,MENG Weiqi,SHEN Jingtao, et al. Advances in Research of Performance Activation of Recycled Powders and Relevant Applications[J]. Materials Reports, 2024, 38(10): 22100042-13.

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http://www.mater-rep.com/EN/10.11896/cldb.22100042 OR http://www.mater-rep.com/EN/Y2024/V38/I10/22100042

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