Abstract
High-performance concrete mixes, made with 10% silica fume and various percentages of pulvarized fly ash as an ordinary Portland cement replacement, were prepared and subjected to sulphuric and hydrochloric acid environments. This research was conducted in order to study the effect of various levels of replacement materials and to obtain the optimum mix possessing a maximum protection against acid attack. The parameter investigated was the time, in weeks, taken to cause 20% weight loss of fully-immersed concrete specimens in a 1% solution of sulphuric acid and the same amount of loss in a 1% solution of hydrochloric acid. The investigation indicated that the concrete consisting of 10% silica fume and a maximum of 60% pulvarized fly ash as an ordinary Portland cement replacement showed an optimum protection in the acidic environment.
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