Abstract
Experimetal studies on destruction of cement mortar induced by internal high pressure gas were carried out. In this lst Report, flaking type destruction of mortar are shown photographically, and its charactericities are discussed. The results obtained from them are as follows:1) Under an experimental condition, that is St=1.0 (kg/cm2) and Pr=285 (%), when one end surface of confined mortar in which high pressure gas (5-6kg/cm2) has been existed is suddenly exposed to the atmospheric space, the mortar is usually flaked into pieces from surface to bottom. And the demolished cavity that was formed in the vessel was very similar to those of conical outbursts.2) It is confirmed that the most necessary condition for the occurrence of mortar outbreaking is the creation of steep gas pressure gradient within the narrow neibourhood from the surface of material.3) A lot of cracks that are nearly pararell to the surface are possible to be created by tensile stress that will be distributed corresponding to the gas pressure distribution.4) If the internal gas pressure is set up higher, the depth and the volume of the demolished cavity becomes deeper and larger.
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