Study on the Particle Characteristics of Recycled Concrete Powder and the Performance of Mortar

doi:10.11896/cldb.20110258

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	Study on the Particle Characteristics of Recycled Concrete Powder and the Performance of Mortar
	Fu, Yong 1; Xue, Cuizhen 1; He, Jianghong 2; Liu, Yuguo 2; Zhu, Xiangchen 1
刊名	Cailiao Daobao/Materials Reports
	2022-05-25
卷号	36 期号:10
关键词	Cements Concrete mixing Concrete mixtures Efficiency Entropy Recycling Silica fume Strength of materials Structure (composition) Testing Cement concrete Cementitious materials Concrete powder Construction wastes Filling effects Grey relation entropy Particle characteristics Particle parameters Particles distribution The theory of gray relation entropy
ISSN号	1005-023X
DOI	10.11896/cldb.20110258
英文摘要	In order to improve the efficient recycling efficiency of concrete powder of construction waste (hereinafter referred to as concrete powder), based on the test and analysis of the particle characteristics of cement, concrete powder and silica fume cementitious system, the influence of cement concrete powder, cement concrete powder silica fume binary and ternary system on the dense filling effect of cementitious materials was studied by using the Dinger-Funk model. Based on the theory of grey correlation entropy and SEM micro test method, the influence of the particle characteristics of concrete powder on mortar strength and internal structure compactness of mortar was also discussed. The research results showed that the single mixing of finer concrete powder reduced the early strength of the mortar, when the mixing amount was controlled at 10%-20%, the 28 d microscopic morphology appeared compact, and the later strength was improved. When the concrete powder-silica fume was mixed, the silica fume was further filled with the particle pores of cement concrete powder, which further improves the compaction of the cementitious material system, and the 28 d strength was significantly improved. The content of concrete powder particles with the diameter range of 10-20 μm was positively related to the mechanical properties of mortar and the filling effect of cementitious material system, and the content of concrete powder particles with the diameter more than 40 μm was negatively correlated with it. In summary, in order to ensure the strength of the mortar and maximize the use of concrete powder, the content of particles with the diameter less than 40 μm should be increased as much as possible, especially the content of particles with the diameter less than 10 μm. The content of particles with the diameter more than 60 μm should be reduced to optimize the particle gradation of concrete. At the same time, the replacement amount should be controlled within 20%. This work will provide theoretical and technical support for the fineness control and high efficiency recycling of construction waste concrete powder. © 2022, Materials Review Magazine. All right reserved.
语种	中文
出版者	Cailiao Daobaoshe/ Materials Review
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/158402]
专题	兰州理工大学
作者单位	1.School of Civil Engineering, Lanzhou University of Technology, Lanzhou; 730050, China; 2.China Construction Fourth Engineering Bureau Co., Ltd., Guangzhou; 510665, China
推荐引用方式 GB/T 7714	Fu, Yong,Xue, Cuizhen,He, Jianghong,et al. Study on the Particle Characteristics of Recycled Concrete Powder and the Performance of Mortar[J]. Cailiao Daobao/Materials Reports,2022,36(10).
APA	Fu, Yong,Xue, Cuizhen,He, Jianghong,Liu, Yuguo,&Zhu, Xiangchen.(2022).Study on the Particle Characteristics of Recycled Concrete Powder and the Performance of Mortar.Cailiao Daobao/Materials Reports,36(10).
MLA	Fu, Yong,et al."Study on the Particle Characteristics of Recycled Concrete Powder and the Performance of Mortar".Cailiao Daobao/Materials Reports 36.10(2022).