コンクリートの遷移温度クリープ性状に関する研究 : 温度80℃以下における遷移温度クリープを含む線膨張係数

Abstract

It is important to grasp the thermal properties of concrete including creep of concrete for preventing cracks of reinforced concrete members subjected to repeated thermal loads. Some experiments were conducted using cocrete specimens under constant compressive stress subjected to temperatures up to about 80℃ at slow heating and/or cooling rate to evaluate thermal strain including transient thermal creep. From the experiments, the following conclusions were derived: 1.The influence of transient thermal creep was most remarkable at the very first-time heating for the concrete, though the influence at the repeated heating and cooling phase of concrete was little. 2.A new coefficient of thermal expansion including transient thermal creep can be formulated by both the heating rate and the applied compressive stress ratio of concrete.