Changes of the Fracture Energy of Cement Paste with Addition of Fly Ash in Time

The size of the fracture energy of cement paste reaches values other than cement paste without admixtures. The cement paste increases the strength during time of its existence. Paper describes experimental investigation on the field of material properties of cement paste with addition of fly ash, especially the fracture energy. At first, it describes the production of specimens and their testing methodology. Paper present results of the experiments in three point bending tests. From this kind of test is calculated the fracture energy of the cement pastes in various states of moisture of the specimens. Finally, results are summarized.