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The influence of internal corrosion on the durability of concrete

Łowińska-Kluge A., Błaszczyński T.

Archives of Civil and Mechanical Engineering

2012

Vol. 12, no. 2

219--227

The basic condition which must be met by reinforced concrete constructions is maintaining durability for a sufficiently long period of time. Correctly designed and manufactured concrete (or concrete in reinforced concrete; in accordance with the function it is to fulfill and its form, all the while taking into account the geological conditions and climate of a given construction site) is characterized by sufficient durability over many years. It is, however, possible that the properties of an actual concrete construction differ from those established in project calculations—as a result of mistakes made by concrete manufacturers or on the construction site (e.g., insufficient quantity of cement, bad quality of cement, using a different kind of cement than intended, using a cement substitute with various additives, inappropriate aggregate, inappropriate aggregate particle size, incorrect technological procedures, etc.). This has an effect on whether a building functions properly or even prevents it from being utilized in accordance with its intended use; this often poses a health threat or even endangers the life of people exploiting and spending time in such buildings. This article concerns the more and more common problem of concrete and reinforced concrete damage resulting from the incorrect selection of mix components along with the implementation of incorrect technologies of realization. This issue has been presented and analyzed on the basis of reinforced concrete foundations of a sports hall under construction. Its intended use was that of a indoor sports and entertainment center in which the base plate constituted a significant part of the roof covering structure. Therefore, the properties of concrete which was used to construct this base plate were very important. Consequently, the need arose to reconstruct its composition and determine the reactions already taking place as well as to predict the occurrence of undesirable reactions which would influence the durability of this structure in the future. This was done based on the results of microscopic, chemical, derivatographic and X-ray tests. In the described case study, because of the suspicion that different concrete recipes and different ingredients than the design called for had been used and the implementation of incorrect technological procedures (which resulted in the decreased durability and strength), there was a risk that the construction posed a threat to the health and life of people.