Abstract
A number of important properties of the made mortar and concrete used with among others compressive strength, sulphate resistance, carbonation, corrosion resistance, and resistance to acid attack need to be studied. Slag is one of the promising sustainable solutions as it can improve a durability of concretes and is obtained as solid waste generated by industry. Concrete sets of specimens were prepared based on the Portland cement only and also with 65% wt. cement replacement by granulated blast-furnace slag. Chemical acid corrosion, simulated by H2SO4, was investigated in terms of basic concrete´s elements leachability (calcium and silicon). Sulphuric acid solutions were prepared in two concentrations (0.005 wt. % H2SO4 with pH 3 and 0.0005 wt. % H2SO4 with pH 4). Dissolved amounts of elements due to chemical corrosion attacks measured in the period of 3 months represented the deterioration parameters used for the mathematical evaluation regrading dependency of leaching the elements based on different concentration of acid solution or based on specimen composition. In spite of the same chemical composition of leachates, the leaching performance of concretes regarding silicon was fully independent when exposed to solution of sulphuric acid with pH of 3 and 4, respectively. The finding revealed the similar leaching trend and behaviour of dissolved calcium in the studied solutions of sulphuric acids for concrete sample with slag addition.
