Abstract
As fracture is separating material, so it is possible to appreciate that fracture is chemical reaction of solid. Chemical thermodynamics is used for a fundamental theory of chemical reaction, so it is posible to predict the effect on applying the thermodynamics to the analysis of fracture of hardened cement paste. The purpose of this report is to analyze the breaking phenomenon of specimens by the application of the two big laws of thermodynamics. The outline of results is as follows. (1) It is proved that the potential energy of the steel ring breakes the hardend cement paste ring. (2) It is proved that the potential energy of the hardend cement paste ring is going to react on decleasing. (3) As the results of the experiments, quantity of breaking energy of mortar is concerned with quantity of sand in mortar.
