Concrete is historically one of the most important and most used materials in
the world. Because of this, its degradation is very big problem. However, to prevent the
degradation of concrete, it is necessary to understand the various causes of concrete
degradation. Most common reason for degradation of concrete are natural and chemical
factors. The alkali-carbonate reaction is type of chemical reaction and its action enables
accelerated degradation of the concrete. The main process of the ACR reaction is
dedolomitization which is harmless but it reduces the volume of the phases and thus offers
the possibility of penetrating the ASR gel deeper into the concrete. The degree paper also
presents methods and analytical equipment for determining the microstructure and
different types of phases in degradation of concrete due to the ACR reaction.
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