Leaching of calcium and silicon from cement composites in the aggressive environment

Kovalčíková, Martina and Eštoková, Adriana (2014) Leaching of calcium and silicon from cement composites in the aggressive environment. Pollack Periodica, 9 (2). pp. 123-130. ISSN 1788-1994

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Abstract

Deterioration of concrete materials exposed to an aggressive solution is often characterized by the leaching of calcium and silicon compounds from the cement matrix. This paper presents the results of the study of concrete composites exposed to the various sulphate environments (sulphuric acid and magnesium sulphate solutions) under laboratory model conditions. The leaching of the calcium and silicon from concrete specimens has been studied during 180 days using X-ray fluorescence method for leachate analysis. As expected, sulphuric acid of pH3 was confirmed to have the most significant effect on the studied ions releasing. The released amounts of analysed ions were 192.2 and 9.6 times higher for calcium and silicon ions, respectively in H2SO4 with pH=3 when compared to fresh water. The concentration of released calcium was 2.6 times higher

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