College of Architecture and Civil Engineering, Xi’an University of Science and Technology
Power China Northwest Engineering Co., Ltd.

为研究再生复合微粉复掺比对混凝土界面过渡区性能的影响机理,用宏微观试验相结合的方法,分析不同复掺比对混凝土劈裂抗拉强度和显微硬度的影响规律,并利用灰色关联法探究力学性能与微观结构的关系。结果表明:再生砖粉对混凝土的改善效果优于再生混凝土粉,且掺入合理的再生复合微粉会改善混凝土界面过渡区的微观结构;再生复合微粉混凝土各组相显微硬度关系为:骨料相>砂浆相>界面过渡区相,且界面过渡区厚度随养护龄期的增加而逐渐减小;界面过渡区厚度与劈裂抗拉强度关系显著,呈线性负相关,所建立的模型拟合度较高。界面过渡区厚度能准确地表征再生复合微粉混凝土宏观性能变化规律,当再生混凝土粉/再生砖粉为2∶8时,可制备出性能良好的C30混凝土,具有良好的推广应用价值。

In order to study the influence mechanism of recycled composite micro-powder compound mixing ratio on the performance of the interface transition zone of concrete, the influence of different compound mixing ratios on the splitting tensile strength and microhardness of concrete was analyzed by combining macro and micro experiments, and the correlation between mechanical properties and micro- structure was explored using the grey correlation method. The results show that the improvement effect of recycled brick powder on concrete is better than that of recycled concrete powder, and the micro- structure of the interface transition zone of concrete can be improved by adding reasonable recycled composite micro-powder. The microhardness relationship of each phase of recycled composite micro- powder concrete is as follows: the aggregate phase > the mortar phase > the interface transition zone phase, with the interface transition zone thickness gradually decreasing as the maintenance ages in- crease. The thickness of the interface transition zone has a significant relationship with the splitting ten- sile strength, showing a linear negative correlation. The established model has a high degree of fit. The study suggests that the thickness of the interface transition zone can accurately characterize the macro- scopic performance change rule of recycled composite micro-powder concrete. When the ratio of recy- cled concrete powder to recycled brick powder is 2 ∶ 8, high-performance C30 concrete can be pre- pared, which has good promotion and application value.

陕西省基础研究计划面上项目(2023-JC-YB-285);中国电建集团西北勘测设计研究院有限公司科研项目(102/6000210425)

关羉,张源,孙甲,等.再生复合微粉混凝土界面过渡区性能研究[J].西安科技大学学报,2024,44(2):359-365.

GUAN Xiao, ZHANG Yuan, SUN Jia, et al. The performance of interface transition zone of recycled composite micro-powder concrete[ J] . Journal of Xi’an University of Science and Technology, 2024, 44( 2) : 359-365.