Effect of rust inhibitors and surface strengthening materials on service life of marine RC structures

Abstract

Purpose The purpose of this paper is to compare the effect of rust inhibitors and surface strengthening materials on the service life of RC structures in tropical marine environments and ultimately to provide basis and recommendations for the durability design of reinforced concrete (RC) structures. Design/methodology/approach Slag concrete specimens mixed with four kinds of rust inhibitors and coated with four kinds of surface strengthening materials were corroded by seawater exposure for 365 days, and the key parameters of chloride ion diffusion were obtained by testing. Then a new service life prediction model, based on the modified model for chloride ion diffusion and reliability theory, was applied to analyze the effect of rust inhibitors and surface strengthening materials on the service life of RC structures in tropical marine environments. Findings Rust inhibitors and surface strengthening materials can effectively extend the service life of RC structures through different effects on chloride ion diffusion behavior. The effects of rust inhibitors and surface strengthening materials on the service life extension of RC structures adhered to the following trend: silane material > cement-based permeable crystalline waterproof material > hydrophobic plug compound > spray polyurea elastomer > water-based permeable crystalline waterproof material > calcium nitrite > preservative > amino-alcohol composite. Originality/value Using a new method for predicting the service life of RC structures, the attenuation law of the service life of RC structures under the action of rust inhibitors and surface strengthening materials in tropical marine environments is obtained.

Effect of silane on corrosion resistance and aerodynamic performance of 6063 Al alloy inertial air–water separator

“…Silane treatment has become a new surface treatment technology owing to its simple operation, low cost, short treatment time and environmental friendliness (Owczarek, 2018; Zhu et al , 2021). The formation of a silane film on a metal surface is mainly achieved by hydrolysis and condensation of the silane coupling agent (Calabrese et al , 2018; Xing et al , 2019).…”

Corrosion Behavior of Reinforcing Steel in the Immersed Tube Tunnel (ITT) under Submarine Environment

“…Epoxy-coated reinforcing steel [24,26] has good anti-corrosion performance, but there are also problems of high costs and broken epoxy coating leading to accelerated local corrosion. In addition, although the use of rust inhibitors [24,27,28], waterproof or hydrophobic materials [24,29], and Zn-Al coatings [24,30] can all effectively improve the durability of ITTs, problems of increasing construction costs or maintenance difficulties exist. Considering the importance of ITTs in transportation and the high cost of construction and maintenance, multiple anti-corrosion methods are usually used together to ensure the durability of ITTs, and no single method is used.…”