The structural expanded polystyrene (EPS) concrete (above 35 MPa) has the potential to be used as metro track bed to reduce and isolate vibration, but its bond behavior is still unclear. This inhibits its application because it is often used in combination with reinforcing bar. In this paper, a class of structural EPS concrete (above 35 MPa) was developed. Based on this, a series of pull-out tests were conducted and the bond behavior of deformed bars in these structural EPS concretes was investigated. In addition, effects of rebar bond length and rebar diameter were analyzed in detail. Experimental results indicate that the structural EPS concrete suffers splitting failure more easily than the conventional concrete (CC). Increase of EPS replacement, rebar bond length or rebar diameter tends to cause the splitting failure of structural EPS concrete. Moreover, with increase of EPS replacement, the failure process is less explosive and more gradual. The stress-slip relationships of the most specimens show three stages, namely linear ascending, non-linear progression, and descending stages. The bond strength of structural EPS concrete is found depended linearly on the power function of its compressive strength, relative cover thickness (c/d) and relative rebar bond length (L/d), respectively. Accordingly, a bond strength prediction model was formulated, and it can precisely predict the bond strength of deformed bars in structural EPS concrete, specimens failing in splitting or splitting-pull out modes, and no fiber added. The results can provide reference for the design of structural EPS concrete.

具有结构扩展性的聚苯乙烯（EPS）混凝土（高于35 MPa）具有用作地铁轨道床以减少和隔离振动的潜力，但其粘结性能仍不清楚。由于它通常与钢筋结合使用，因此抑制了其应用。本文开发了一类结构性EPS混凝土（35 MPa以上）。在此基础上，进行了一系列拉拔试验，研究了这些结构EPS混凝土中变形钢筋的粘结性能。此外，详细分析了钢筋粘结​​长度和钢筋直径的影响。实验结果表明，结构EPS混凝土比常规混凝土（CC）更容易遭受劈裂破坏。EPS替换量，钢筋粘结长度或钢筋直径的增加往往会导致结构EPS混凝土的劈裂破坏。此外，随着EPS替换量的增加，故障过程的爆炸性会越来越小，而且逐渐发展。大多数试样的应力-滑移关系显示出三个阶段，即线性上升，非线性进展和下降阶段。发现结构EPS混凝土的粘结强度线性取决于其抗压强度，相对覆盖层厚度（c / d）和相对钢筋粘结长度（L / d）。据此，建立了粘结强度预测模型，可以准确预测结构EPS混凝土中变形钢筋的粘结强度，试件开裂或开裂模式失败，不添加纤维。研究结果可为结构EPS混凝土的设计提供参考。