Study on the Corrosion Resistance of Slag and Fly Ash Concrete
Authors
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School of Civil Engineering, Nanyang Institute of Technology, Nanyang, 473004 ,CN
Yuhui XIE
Keywords:
High Strength Concrete, Anti-Sulfate Corrosion, Slag, Fly Ash.Abstract
The adding of a certain amount of fly ash and slag in Ordinary Portland cement concrete may effectively improve the anti-sulfate corrosion of concrete under the premise of not reducing the strength of concrete. This paper mainly studies the anti-sulfate corrosion of different contents slag and fly ash concrete. Study has shown that the fly ash with content of 10%, 20% and 30% can meet the sulfate resistance index of concrete in each strength grade. For S95 slag, if the content reaches 30% in high-strength concrete (C40, C45), the sulfate resistance index of concrete can still be reached, while in slightly lower strength concrete (C30, C35), the strength of test piece after 150 times’ sulfate attack has been less than 70%, failed to meet the standard requirements. In each strength grade proportion of mixture, sulfate resistance of concrete with fly ash is much better than the one with slag, but with the increasing of admixture content, the sulfate resistance of test piece will decrease slightly. For anti-sulfate, the sequence of optimizing mineral admixtures is: fly ash> S95 slag> S75 slag.
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