Possibilities for improving the technical characteristics of concrete based on cement with a limestone additive

The article examines the influence of different amounts of limestone in cement and additionally introduced additives, microsilica and polycarboxylate superplasticizer, on the formation of the structure of cement stone and concrete and their technical characteristics. The study involved the analysis of the strength characteristics, porosity, porosity, elastic modulus of concrete samples and the phase composition of cement stone in concrete with various combinations of additives. The results demonstrate that the use of cement with 30 % limestone without the addition of a superplasticizer or a complex with microsilica will not provide the level of technical performance of concrete compared to cement containing up to 10 % limestone. Attempts to compensate for this effect using highly effective additives such as superplasticizer and microsilica only help to maintain technical performance at the level of cement without limestone. As a result, the cement with a limestone content of up to 30 % can only be used for interior work or for obtaining finishing compositions.