Fly ash-useful material for preventing concrete corrosion

Abstract

Large quantities of fly ash is produced in our country every year. Most of fly ash is got from lignite that means that this material is not so useful for concrete production. This paper presents results of investigations of sulphate corrosion of concrete made from portland cements and portland cements with the fly ash addition. The addition of fly ash appears to be very useful for preventing sulphate corrosion of concrete even in the case of very strong ammonium-sulphate corrosion according to our results. The effect of ammonium sulphate solution on the durability of Portland cements (various C3A content) with partial replacement of 30% mass percent fly ash was investigated. Results show that fly ash addition to Portland cement can improve resistance to ammonium sulphate attack.