Behaviour of hardened Portland cement and Portland fly ash cement in ammonium sulphate solution

This paper considers the sulphate corrosion of microconcrete made with Port land cements (C(3)A content in clinker 6.60 and 13.31 M.-%) and with the sa me Portland cements where 30 % of Portland cement clinker has been replaced with fly ash. The test samples were prepared according to Koch-Steinegger' s method and then exposed to the influence of aggressive environments (solu tions with SO43- ions as well as NH4+ ions). Several properties were measur ed. The results were analyzed and a correlation among the influencing facto rs was suggested through a degradation coefficient. Fly ash also had a stro ng effect on degradation.