Abstract
The mechanical properties of high strength concrete at high temperature have been studied experimentally. The compressive tests were carried out with specified design strength of 60, 80 and 100 N/mm^2. For high strength concrete under heating conditions below 400℃, the initial slope is steeper, and the limit of linear response shows a higher percentage of the compressive strength. Also, the compressive strength decreases at 100℃ during heating, increases up to at 200℃ and gradually decreases with further increase of temperature. The formulation for stress-strain curves of high strength concrete were proposed in consideration of high temperature. Also, the formulations for compressive strength, strain at maximum compressive strength and elastic modulus were proposed in the same way.
