ひびわれの生じたコンクリート壁からの気体漏洩

抄録

This paper is the fourth report on the leakage of gas through cracked concrete wall. For the purpose of formulating the leakage of gas through a crack in a concrete wall, eighteen specimens were tested and the following seven conclusions were obtained. (1) The leakage rate of gas through a crack in a concrete wall can be formulated accurately by the experimental equation based on compressible flow between two parallel plates. (2) Under limited conditions, the leakage rate of gas also can be formulated with enough accuracy by the experimental equation based on two-dimensional poiseuille's flow. (3) Although specimens are made and tested under the same conditions, considerable difference arises inevitably in the results of leakage tests. (4) The effect of the variation in the type of fine aggregate and the size of coarse aggregate is small and can be neglected. (5) The leakage of gas through a crack in the ordinary concrete with crushed gravel can be estimated by .the experimental equation (5). (6) Under limited conditions, the equation (6) can be recommened for practical use instead of the equation (5). (7) Deformed reinforcing bars decrease the leakage rate of gas.