Behavior of reinforced self-curing concrete slabs exposed to fire

Abstract

The influence of fire on self-curing reinforced concrete flat slabs was inspected in this study. In this paper the focus will be on the effectiveness of the reinforcement ratio, heat duration and cooling method on the behavior of self-curing (SCU) reinforced concrete flat slabs exposed to fire. To create SCU concrete, polyethylene glycol (PEG 400) is added at a rate of 0.5% of cement weight. Twenty-five RC plates (1200 mm x 1200 mm x 70 mm) lying on four supports and being subjected to concentrated load were used to achieve the experimental programme. The experimental program was conducted in two stages. The first stage, the specimen exposed to high temperature (600oc) for 1 hour and 2 hours. To record the failure load and the deflections at each load increment, the load was gradually increased in the second stage. The results show that, the cracking and the ultimate loads decreased, while the deflection increase either with the increase of fire flame duration and cooling method from gradually to sudden.

Keywords

• fire
• self-curing concrete
• fly ash
• flat slabs
• reinforcement ratio