Abstract:

An inorganic adhesive, whose strength at 600 ℃ is not lower than that at normal room temperature, was developed and used to bond CFRP sheets to strengthen concrete slabs. Experiments were carried out to investigate the mechanical properties of four strengthened slabs that had experienced fire. The flexural failure processes of the slabs were observed. Flexural carrying capacity of the slabs and the loadingdisplacement curves in the midspan were obtained and analyzed. Results show that the strength of CFRP sheets bonded with the inorganic adhesive can be played fully when temperature that the sheets have experienced is below 300 ℃ in fire. Based on the results, the formula to calculate the flexural carrying capacity and the calculation method of the stiffness were presented. The calculation values are in good agreement with that of experiment results.

Key words: civil engineering, the inorganic adhesive, after fire, flexural carrying capacity, stiffness