건설재료시공학연구실

Building material & construction lab.

ABSTRACT
Strain is generated in concrete subjected to elevated temperatures owing to the influence of factors such as thermal expansion and design load. Such strains resulting from elevated temperatures and load can significantly influence the stability of a structure during and after a fire. In addition, the lower the waterto-binder (W/B) ratio and the smaller the quantity of aggregates in high-strength concrete, the more likely it is for unstable strain to occur. Hence, in this study, the compressive strength, elastic modulus, and creep behavior were evaluated at target temperatures of 100, 200, 300, 500, and 800 °C for highstrength concretes with W/B ratios of 30%, 26%, and 23%. The loading conditions were set as nonloading and 0.33fcu. It was found that as the compressive strength of the concrete increased, the
mechanical characteristics deteriorated. Furthermore, when the point at which creep strain occurred at elevated temperatures after the occurrence of transient creep was considered, greater shrinkage strain occurred as the compressive strength of the concrete increased.