拘束されたセメント硬化物の破壊に関する熱力学的研究 : その2 熱力学的解析から導かれる力の挙動

抄録

In general, phenomena of fracture of hardened cement paste have been analyzed by dynamics. Recently the theory of energy has begun to be used for analysis of them. In this report, phenomena of fracture of a specimen are analyzed by dynamics and thermodynamics. The outline of results is as follows. (1) Dynamics consists of the laws of motion. From a thermodynamic point of view they belong to the first law of thermodynamics, so that only reversible process (quasi-static process) of fracture can be analyzed by dynamics. (2) Thermodynamics consists of the law of conservation of energy and the law of entropy, so it is possible to analyze both reversible and irreversible process. The result of thermodynamic analysis is more exact than that of dynamic analysis. (3) It has been demonstrated that the force in the steel of a specimen weakens the cohesive force, and the force in the elastic part of the mortar decreases to equilibrate with the cohesive force but it does not weaken the cohesive force.