コンクリートの載荷時熱ひずみに及ぼす養生条件と水セメント比の影響 コンクリートの高温時特性に及ぼす水分の影響(その2)

摘要

本報では,コンクリートの養生条件(気中養生,封かん養生,105℃での事前乾燥)および水セメント比(40%,50%,65%)がその載荷時熱ひずみに及ぼす影響を,加熱速度1.5℃/分の全ひずみ実験および重量減少測定実験によって検討した.また,実験から得られた載荷時熱ひずみと試験体の重量減少率の関係を検討した.以下に本研究から得られた知見を示す.%In the present study, the influence of the curing conditions (airdried, oven-dried and sealed curing) and water/cement ratios (40%, 50% and 65%) on the load- induced thermal strain (LITS) of concrete specimens was investigated. The relationship between the LITS and specimen weight loss was also evaluated in order to develop a comprehensive model for the UTS. It was clarified from the present study that LITS due to dehydration and decomposition was much larger than that due to water evaporation. And, the numerical model for the LITS was proposed as a function of the weight loss of the specimens.