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Attack of external water to concrete results in the degradation of cement and changes the concrete pore water and solid phase composition. The leaching behaviour of cement-based products have been shown to be similar after assessing the leaching characteristics by means of a pH dependence leaching test. The paper is focused on the investigation of the leachability of the concrete samples of different composition due to distilled water and its relation to pH. Si, Ca, Al, Fe and Mn ions leached out from the cement matrix were measured after each of fives experimental cycles. Three sets of samples were studied: without fly ash, and containing coal fly as cement replacement (5 wt. % and 10% wt. respectively). Statistical methods were used for the intensity and course of deterioration assessment regarding a dependency of Si/pH, Ca/pH Al/pH and Fe/pH and Mn/pH for each type of samples. The correlation among leaching processes according to type of concrete were also statistically studied.