Abstract
Magnesium phosphate cement (MPC) is a cementitious material formed by an acid-base reaction, which has usually developed as repair material for rehabilitation engineering. It also has the potential as coating materials for fire-resistance and for corrosion protection. In this study, the effect of magnesium phosphate cement as an inorganic coating on the water permeability of cement-based material is studied. X-ray computed tomography (XCT) was used to track the capillary adsorption process of hardened cement non-destructively. The results showed that magnesium phosphate cement as the coating of cement-based materials has an excellent resistance to water penetration, and the quantitative and qualitative analysis of XCT water penetration was conducted. The microstructure analysis showed that the MPC matrix has much smaller porosity and pore sizes than the OPC matrix, and the interphase of OPC and MPC is dense and continuous, which may provide a remarkable effect on the capillary absorption blocking process. According to the Lucas-Washburn equation, a linear relationship between water absorption height and the square root of time was established to verify the experimental results measured/calculated by XCT.
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