高温加熱の影響を受けたコンクリートの引張破壊特性に及ぼす粗骨材の影響

摘要

This paper reports on the influence of coarse aggregate on the fracture properties of concrete subjected to high temperatures up to 800℃. The fracture properties were evaluated based on tension-softening curves which were determined by polylinear approximation through inverse analysis of load versus crack mouth opening displacement (CMOD) curves, obtained from wedge-splitting tests using a dedicated analysis program. The follow conclusions were found in this study: The initial cohesive stress of mortar was higher than that of concrete. And the fracture energy of concrete was higher than that of mortar.%本研究では，高温加熱の影響を受けたコンクリートの引張破壊特性に及ぼす粗骨材の影響について検討を行った。その結果，以下のことが明らかとなった。(1)荷重-開口変位曲線における最大荷重は，コンクリートよりもモルタルの方が大きく，モルタルは加熱時間1時間で300℃,加熱時間12時間で200℃,コンクリートは加熱時間1,12時間とも200℃で最大荷重が最も大きい。