This paper presents the outcomes of an experimental study carried out to investigate the residual bond behavior of normal strength concrete with super ductile thermo-mechanically treated (SD TMT) reinforcing steel bars exposed to elevated temperatures. SD TMT bars category is relatively new compared to conventional reinforcing steel due to special chemical and posts rolling treatment making the rebars more ductile and suitable for seismic zones or earthquake-prone areas. SD TMT provides better bonding characteristics with concrete due to distinctive and unique rib patterns, greater rib height, closer rib spacing, and steep rib face angle. For this objective, cylindrical pullout specimens were prepared as per RILEM specifications with normal strength concrete and SD TMT bars of sizes (8 mmØ, 10 mmØ, 12 mmØ, 16 mmØ and 20 mmØ) and embedment lengths of 5 times rebar diameter. The specimens were exposed to elevated temperatures (200 °C, 400 °C, 500 °C, 600 °C, 700 °C & 800 °C) and then cooled down to ambient conditions. The specimens were tested in a displacement controlled UTM in pullout mode to failure. The slip of the rebar, at the loaded as well as the unloaded end, was recorded through a set of linear variable displacement transducers (LVDT) arrangement. The study presents unique bond-slip response curves depicting the overall behavior of the bond mechanism. A detailed account of the test results, analysis, discussion, and comparisons with information previously available from literature is presented. The results showed better bond behavior of SD TMT bars with concrete after exposure to elevated temperatures. Based on test results, a correlation is proposed for the bond-slip model as well as bond-temperature interaction and resulting degradation. The findings of this study have direct implications on procedures used for predicting the post heated behavior of structural elements.

本文介绍了一项实验研究的结果，旨在研究暴露于高温下的超韧性热机械处理（SD TMT）钢筋的普通强度混凝土的残余粘结性能。与传统的钢筋相比，SD TMT钢筋类别相对较新，这归因于特殊的化学和后期轧制处理，使钢筋更具延展性，并适用于地震带或地震多发地区。SD TMT具有独特和独特的肋骨图案，更大的肋骨高度，更近的肋骨间距以及陡峭的肋骨面角，可提供与混凝土更好的粘结特性。为了达到这个目的，根据RILEM规范准备了圆柱形拉拔试样，并使用了标准强度混凝土和SD TMT钢筋，其尺寸为（8mmØ，10mmØ，12mmØ，16毫米直径和20毫米直径），嵌入长度是钢筋直径的5倍。将样品暴露于高温（200°C，400°C，500°C，600°C，700°C和800°C）下，然后冷却至环境条件。在拉拔模式下，在位移控制的UTM中对样品进行测试，直至失效。通过一组线性可变位移传感器（LVDT）记录钢筋在装卸端的滑移。该研究提出了独特的键滑响应曲线，描绘了键机制的整体行为。介绍了有关测试结果，分析，讨论和与以前可从文献中获得的信息的详细说明。结果表明，SD TMT钢筋与混凝土在高温下的粘结性能更好。根据测试结果，提出了一种关于粘结滑移模型以及粘结温度相互作用和最终降解的相关性。这项研究的发现对用于预测结构元件的后加热行为的程序有直接的影响。