硅酸盐水泥
材料科学
水泥
复合材料
磷酸镁
表面光洁度
分形维数
表面粗糙度
联锁
抗压强度
厚板
分形
结构工程
数学
工程类
数学分析
作者
Suhui Zhang,Qiuyi Li,Qiang Yuan,Shangfu Yang,Xiaodi Dai
标识
DOI:10.1016/j.conbuildmat.2022.126585
摘要
This paper investigated the bonding performance between magnesium phosphate cement concrete (MPC) and ordinary portland cement concrete (OPC) with different roughness. The bonding interface was characterized using fractal dimension, backscattered electronic microscopy, and microhardness. The optimal mixture proportion of MPC is selected with the mass ratio of MgO-KH2PO4 (M/P) by 3:1 and Na2B4O7·10H2O-MgO (B/M) by 40%, which has the compressive strength of 52.8 MPa and the initial setting time of 24 min 20 s. It is found that the roughness indicated by fractal dimension has a positive correlation to rough depth and the bonding performance. The bonding interface can be categorized into two forms that either MPC paste bonds to OPC paste or bonds to the aggregate. Micro-analysis shows that the former has denser hydration products and lower porosity, providing better chemical bonding and the latter contributes to the mechanical interlocking which is the major form of the bonding force. MPC is a potential material for the field application of wet joints of the floating slab tracks.
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