건설재료시공학연구실

Building material & construction lab.

ABSTRACT

 Concrete structures exposed to fire produce changes in their internal structure, resulting in their service life reduction due to the deterioration of its strength and performance capacity. The deterioration level are dependent on the temperature, exposure time, concrete mix proportions, aggregate property, and material properties. This study was performed to evaluate the thermal behavior of ultra-high strength concrete for the parameters of water to cement ratio (compressive strength), fine to total aggregate ratio, and maximum coarse aggregate size. At room temperature and 500oC, tests of ultrasonic pulse velocity, resonance frequency, static modulus of elasticity, and compressive strength are performed using ∅100 × 200 mm cylindrical concrete specimens. The results showed that the residual mechanical properties of ultra-high strength concrete heated to 500oC is influenced by variation of a water to binder ratio, fine to total aggregate ratio, and maximum coarse aggregate size.