Abstract
This paper investigates the phenomenon of the size effect of quasi-brittle lime-based material. This research aims to confirm the existence of a size effect on a homogeneous material - test specimens of mortar, which are subjected to uniaxial compression and provide additional knowledge to explain the causes of the size effect. This paper deals with the analysis of the results of experimental tests of mortar specimens without inclusion and with one centrally located steel inclusion. Two series of tests with different slenderness and size were prepared. The results of the experiment showed that the compressive strength of the test specimens decreased with increasing specimen size. The larger interface area between the inclusion and the mortar matrix negatively affected the compression strength.
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