Experimental Study on Carbonation and Steel Corrosion of High Volume Fly Ash Concrete

Abstract-The strength, anti-carbonation resistance and steel corrosion resistance properties of high volume fly ash concrete are studied in this paper. The results show that the strength of concrete for 28d is higher than that of normal concrete, as well as the anti-carbonation resistance, when the mixing amount of fly ash is 30% and 40% and the W/B is below 0.4. The anti-carbonation resistance of C50 is the best of all due to its low W/B, there is almost no carbonation when the mixing amount of fly ash is 30% and 40%. The carbonation depth for 56d is still below 10 mm when the mixing amount of fly ash is 60%. For the concrete of C50 with the W/B of 0.32, the steel weight loss ratio is 0.2% when the mixing amount of fly ash is 50%, so it has good steel corrosion resistance properties.