Study of Anticorrosive Function of Epoxy Zinc-Rich Paint in Epoxy Asphalt Pavement of Steel Bridge Deck

The deck pavement system of the Second Humen Bridge is comprised of steel plates, an anticorrosive layer of epoxy zinc-rich paint, a waterproof binding layer of epoxy resin, the lower paving layer of epoxy asphalt, a binding layer of epoxy resin and the upper paving layer of epoxy asphalt. To study the applicability and necessity of the epoxy zinc-rich paint in the pavement system, the composite specimens comprising steel plates, an anticorrosive layer of epoxy zinc-rich paint, a binding layer of epoxy resin and a paving layer of hot mix epoxy asphalt were prepared. Pull-out tests were carried out to each specimen in different simulated contexts, such as being constructed at high temperatures, dipped in water for a long time, loaded at high temperatures and exposed to salt fog environment, to analyze the high temperature endurance, water stability and durability of the anticorrosive layer of epoxy zinc-rich paint. The results show that the epoxy zinc-rich paint has good binding performance among layers, good high-temperature endurance and water stability. The epoxy zinc-rich paint exerts little influence on the global binding strength of the pavement system of the steel deck, thus can effectively improve the anticorrosive performance of the bridge deck in the service period. The anticorrosive layer of epoxy zinc-rich paint is applicable and necessary to the pavement system of the steel deck. © 2020, Journal Press, China Railway Bridge Science Research Institute, Ltd. All right reserved.