Experimental Study on Nano-SiO 2 Improving Concrete Durability of Bridge Deck Pavement in Cold Regions

Abstract

In order to reduce early damage of bridge deck pavement concrete in cold regions, a certain content of nano-SiO 2 is added into the concrete to enhance its durability. Through tests on four durability indexes, strength, frost resistance, resistance to Cl - ion permeability, and abrasion resistance of concrete with 1% nano-SiO 2 content and concrete without nano-SiO 2 , the ability of nano-SiO 2 to improve the concrete durability of bridge deck pavement is evaluated. The results of tests and analysis show that the incorporation of nano-SiO 2 greatly improves the four durability indexes. Nano-SiO 2 effectively absorbs the calcium hydroxide released early by the hydration of cement, increases the calcium silicate hydrate content, and elevates the interface between the paste and aggregate of the hardened cement, which improves the durability of the concrete.