Bonding Performance and Thermomechanical Coupling Analysis of Iron Ore Tailings Reinforced Concrete

After long-term use at high temperatures, the iron ore tailings (IOT) reinforced concrete will suffer from problems like carbonization, corrosion, and durability decline. It is highly practical to analyze the bonding performance and thermomechanical coupling mechanism of IOT reinforced concrete. The relevant literature rarely considers the influence of temperature over the bonding performance of samples, or prepares samples from IOT concrete. There are very limited results on the similarity of the temperature field and mechanical response of reinforced concrete under high temperatures. To solve the problem, this paper constructs a bond slip curve model for the IOT-reinforced concrete interface, and provides a way to plot the mean bond slip curve, before computing the bond stress distribution, as well as local bond stress-relative slip distribution. Next, the authors summarized the thermal parameters of the IOT concrete material, and the high-temperature relationship between thermal stress and thermal strain. Finally, sixteen central pull-out tests were carried out on central pull-out samples by applying strain gages into rebar slots. In this way, the authors obtained the results on the bonding performance and thermomechanical coupling analysis of IOT reinforced concrete.