Effects of Compound Rust Inhibitor on the Performance of Concrete with a Large Amount of Mineral Admixtures

Abstract

The corrosion of rebars in concrete is a major cause of the falling bearing capacity of concrete structures. The durability of concrete could be effectively enhanced by adding mineral admixtures. Many studies have shown that rust inhibitors can effectively prevent rebar corrosion. Taking commonly used slag, fly ash, and silica fume as mineral admixtures, this paper explores how an alcohol-amine compound rust inhibitor affects the compressive strength, chloride penetration resistance, carbonation resistance, and rebar corrosion resistance of concrete with a large amount of mineral admixtures. The research results show that the addition of rust inhibitor hinders the early hydration of cementitious materials in concrete; the chloride diffusivity and carbonation depth of concrete were minimized, when the ratio of N,N-dimethylethanolamine (DMEA) to sodium monofluorophosphate (MFP) in the compound rust inhibitor stands at 15:1; the addition of rust inhibitor clearly suppressed the corrosion loss of the rebars in concrete, resulting in a low rebar corrosion rate. The research results provide experimental evidence for reducing rebar corrosion in reinforced concrete.

Performance Analysis of High-Performance Concrete Materials in Civil Construction

“…Lu et al investigated the influence of an alcohol–amine compound rust inhibitor on concrete properties using commonly employed mineral admixtures, including slag, fly ash, and silica fume. The study focused on evaluating the effects of this rust inhibitor on the compressive strength, chloride penetration resistance, carbonation resistance, and rebar corrosion resistance of concrete formulations, incorporating a significant proportion of mineral admixtures [ 11 ]. The addition of silica fume to enhance the strength of high-performance concrete also brings about significant self-drying and shrinkage issues, accompanied by an increasing water demand that fails to mitigate temperature concerns.…”

“…Grinding slag helps reduce water consumption, yet it leads to drying and shrinkage. Incorporating fly ash mitigates self-drying shrinkage and reduces water requirements, albeit at the cost of compromised carbonation resistance [ 11 , 12 , 13 ]. Researchers have effectively employed the synergistic effect of multiple mineral admixtures in concrete, achieving enhanced results [ 14 , 15 , 16 ].…”