Experimental Study on Bond-slip between Shaped Steel and Concrete under High Temperature

Abstract

This paper presents results from an experimental study on the effect of temperature on bond strength between steel and concrete. 11 steel reinforced concrete (SRC) specimens were tested by home-made fire test furnace to evaluate bond strength under different constant high temperatures (20-600°C). Results from these tests indicate that the ultimate bond strength and the residual load decrease significantly in 20-250°C temperature range, the ultimate bond strength is much lower at high temperature and just retain 20-30% of its original property at 250°C. It is well established that the quantity of extreme slip (the slip at the ultimate bond load) at evaluate temperature is larger than that at room temperature, and fluctuate with the temperature from 1mm to 8mm. Data from tests also proves that the variation trend of bond-slip curve in 20- 250°C temperature range is similar to that at room temperature, and the descending stages of bond-slip curves disappear from 300°C to 600°C. Data from the test is utilized to propose the empirical relations of bond strength and temperature.