Szukana fraza: [Abstract = "According to the mercury porosimeter test, at 600 degress C, C\-SC and C\-S concretes have the highest number of pores compared to C\-C concretes. The microstructure of concrete at high temperatures was influenced mainly by the aggregate`s types and the paste\-aggregate transition zone. This study reinforces the importance of standardizing test procedures related to the properties of concrete in a fire situation so that all the results obtained are reproducible and applicable in other research."]