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1 Journal of Building Chemistry

1 2016

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Development of two analytical methods for determination of water-soluble chlorides and sulfates in the conservation of concrete heritage buildings

Oroza A. H., Pimentel F. R., Parra E. P., León L. N. D., Amorós Y. G.

Journal of Building Chemistry

2016

Vol. 1, iss. 1

61-68

The corrosiveness and pollution of the atmosphere in the Old City of Havana – Cuba, have come to be over the last decades a growing concern regarding the durability and the aesthetics of heritage and historic concrete buildings. The chlorides and sulfates present in the air are capable to deposit over the concrete and have a direct impact on the deterioration of buildings. Chloride anions induce localized corrosion on the reinforced steel, while sulfates produce severe cracking in concrete. Based on Cuban climate parameters, it is important to develop an analytical method suitable to quantify the amount of these substances in the mass of concrete. The aim of this study was to develop two analytical procedures for the quantification of water-soluble chlorides and sulfates in hardened concrete in used buildings. Basic evaluation of the precision, accuracy and uncertainty of the proposed methods was done. In order to determine the content of water-soluble chlorides, mercury(II) nitrate was used as a titrant, and mix of bromophenol/diphenylcarbazone as an indicator. The sulfates content was determined gravimetrically. The study concluded that both methods, as well as the statistical analysis performed are satisfactory, allowing the quantification of the amount of water-soluble chlorides and sulfates in concrete heritage buildings.