Abstract:
The purpose of this paper was to investigate the influence of high temperature and corrosion on the bond performance between reinforcing steel and geopolymer concrete. Based on the bond-slip law of corroded reinforce and geopolymer concrete after target temperature (30、100、200、400、600、800℃), the dimensionless bond-slip model was established by using a three-segment expression. The experimental design achieved the target corrosion levels of steel reinforcement (0、1、2、3、4、5%) by electrochemical acceleration method, followed by being treated with high temperature heating, and ultimately being tested with the pull-out test to evaluate the bond strength. The study shows that: when the temperature increases and the corrosion degree increases to a certain extent, the bond strength between the reinforcing steel and the geopolymer concrete is significantly reduced; based on the experimental data, developing a bond-slip constitutive model to quantitatively describe the bonding behavior at different temperatures and corrosion regimes. The model not only reveals the influence mechanism of temperature and corrosion on bond and slip, but also provides an important theoretical basis for the design and application of reinforced geopolymer concrete structures after a fire.