Abstract：
Located in the northeast coastal area, the concrete structure of Dalian is complex, which causes serious damage to the offshore concrete structure in the area. In this regard, this paper selects three kinds of protective coatings of polyurea, polyurethane and epoxy mortar to surface the concrete, and the indoor rapid freeze-thaw test was carried out to analyze the effect of the coating on the frost resistance of concrete. The mercury intrusion test was carried out on the concrete samples before and after the freeze-thaw cycle to analyze the pore structure changes before and after corrosion of the coated concrete. The test results show that compared with the uncoated protective concrete, the mass loss rate of the concrete coated with protective coating is reduced, the relative dynamic elastic modulus is increased, and the anti-freezing performance of the protective coating is from strong to weak: Oxygen mortar coating > polyurethane coating > polyurea coating. Because the protective coating isolates the corrosive environment from contact with the concrete, delays the entry of corrosive substances, slows the tendency of the harmless pores inside the concrete to transform into the harmful holes and harmful pores, improves the frost resistance of the concrete, and prolongs the use of the concrete structure life.
ZHANG Cheng1,LI Wei-hong1,WU Chang-long2 et al. Effect of Protective Coatings on Frost Resistance of Concrete Structures in Northeast Coastal Areas[J]. Architecture Technology, 2019, 50(1): 106-109.
