Bond performance of geopolymer concrete with bazalt/glass fiber under elevated temperature

This manuscript aims to assess the bond performance of geopolymer concrete was elevated using pullout tests, in which the influences of fiber type (basalt and glass), bar diameter (8 mm and 16 mm and 24 mm), the position of steel rebar and high temperature (20 degrees C, 200 degrees C, 400 degrees C, 600 degrees C and 800 degrees C) were analyzed. Results from these tests show that rebar diameter is one of the key factor affecting the bond strength. Although increasing the bar diameter generally reduces the bond strength, in some samples the increase in the bar diameter increases the bond strength. On the other hand, experimental results in the case of high temperature present a great dispersion and high relation is observed between bond strength and high temperature. It was observed the bond strength of samples exposed to temperature of 200 degrees C increased, whereas bond strength of samples especially exposed to a temperature of 600 degrees C and 800 degrees C significant decreased. Therefore, it is possible to conclude that the location of rebar may have an important influence on the characterization of the bond as well as fiber type.