Durability of repaired concrete pavement surface defects with MPC materials

Abstract

Durability of concrete defects after repair with MPC. The water resistance of the concrete surface defects and the seawater corrosion resistance of the surface layer of the concrete were studied. The sodium chloride solution was selected as the corrosive medium in the test. The results show that the surface exfoliation concrete has excellent water resistance performance after being repaired by the benchmark MPC mortar. The surface water absorption rate of the surface after 3 h of curing is only 3.13×10-8 g·s-1 mm-2. The concrete specimens repaired by the reference MPC mortar on the concrete surface have a corrosion resistance coefficient of 0.843 after simulated seawater erosion for 28 days, and the corrosion resistance coefficients of the FAMPC mortar and SGMPC mortar after repair are 0.764 and 0.849, respectively. After that, the free chloride ion diffusion coefficient is 9.03 × 10-6mm2s-1, and the chloride ion permeability coefficients of the matrix after repair of FAMPC mortar and SGMPC mortar are 9.97×10-6mm2s-1 and 8.771×10-6mm2s-1, respectively. Both decrease with the increase of exposure time, indicating that MPC materials can be used for rapid repair requirements of airport pavements in coastal areas.