Impact of novel chloride-binding on strength, chloride penetration and resistance to corrosion of concrete exposed to chloride-bearing environment
摘要
Among the various efforts that have been recently taken to combat chloride-induced corrosion is the usage of chloride-binding chemical additives. The current study investigated the performance of various chemical compounds (PbO, Pb (NO3)2 and TiO2) as chloride binders in concrete. Various dosages (0, 0.2, 0.5, 1.0, 1.5 and 2%) were tried in cement pastes for selection of optimum ratios for application in concrete. This work was concerned with the effect of chloride binders on strength (compressive and flexural) properties of concrete, resistance to chloride penetration and rate of steel corrosion in concrete exposed to chloride medium. Chloride binders prolonged the initial and final setting time without negative effect on strength. Using 0.2% PbO provided the highest strength results whereas 0.5% Pb(NO3)2 and 1% TiO2 yielded similar strength to plain concrete without binder but proved resistant to chloride-induced corrosion, making them appropriate chemical compounds for use as chloride binders.