Study on the Particle Characteristics of Recycled Concrete Powder and the Performance of Mortar
FU Yong1, XUE Cuizhen1,*, HE Jianghong2, LIU Yuguo2, ZHU Xiangchen1
1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 China Construction Fourth Engineering Bureau Co., Ltd., Guangzhou 510665, China
Abstract: 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.
付勇, 薛翠真, 何江红, 刘玉果, 朱翔琛. 混凝土再生微粉颗粒特征及其砂浆性能研究[J]. 材料导报, 2022, 36(10): 20110258-6.
FU Yong, XUE Cuizhen, HE Jianghong, LIU Yuguo, ZHU Xiangchen. Study on the Particle Characteristics of Recycled Concrete Powder and the Performance of Mortar. Materials Reports, 2022, 36(10): 20110258-6.
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2022, Vol. 36 
