実大壁試験体によるCube型ボス供試体の圧縮強度に関する研究

Abstract

As a method of estimating the strength of structure concrete, the core specimen is generally used. If the method of core specimen is used, the damage to the structure and the necessity for repair will arise. Therefore, the BOSS specimen with little damage to the structure was devised, and it has been a standard for NDIS number 3424. However, the present BOSS specimen is a 100×100×200mm prism, it does not correspond to ISO of cube specimen. In this study, the BOSS specimens which size were 100×100×100mm cube and 125×125×125mm cube were devised, and the effects of form of BOSS specimens on compressive strength of concrete were investigated by using wall specimens. As a result, the splitting sides of the cube BOSS specimens were smooth, and the standard deviations of compressive strength of concrete were also small. Therefore, it is considered that the cube BOSS specimens can be used to the cube specimens for compressive strength of concrete. When core strength is estimated from the cube BOSS strength, 0.8 by cube BOSS strength can make core strength.本研究では100×100×100mmに加えて125×125×125mmのCube型のボス供試体を開発し、従来から使用されているボス供試体、コア供試体とのコンクリートの圧縮強度について実大壁試験体を用いて比較検討を行った。その結果、いずれのボス供試体の割取り面は平滑で圧縮強度の標準偏差も小さく、立方体供試体として十分活用できると考えられる。そして、Cube型ボス供試体の圧縮強度からコア供試体の圧縮強度（≒構造体コンクリート強度）を推定する場合には、Cube型ボス供試体の圧縮強度に0.8程度の補正係数を乗じる必要があると考えられる。