Cement-based grouting material (CBGM) had many characteristics such as high-early-strength, high strength and high fluidity. It has been widely used in building structural reinforcement projects. This paper presents an experimental study to investigate the bond behavior between CBGM and steel bar under repetitive loading in early age after fire. The hysteretic behavior of pull-out specimen cast with CBGM and steel bar was investigated. The research focused on the influence of different temperatures, curing ages, stirrups and loading methods on the bond behavior between CBGM and steel bar. The microscopic morphology of the specimen was analyzed by scanning electron microscopy (SEM). The results showed that under repetitive loading, the ultimate bond stress decreased gradually with the increase of temperature, and the ultimate bond displacement increased first and then decreased with the increase of temperature. According to the hysteretic curve, the influences of curing age, heating temperature and the stirrups on hysteretic behavior were analyzed. The bonding behavior, ductility and energy dissipation capacity of specimens with 7 days curing age before heating were the best. When the early age specimens subjected to fire continued to be cured for 28 days, the bond behavior of the CBGM was slightly restored. Under the same conditions, the bond behavior, ductility and energy dissipation capacity of the specimens with stirrups were better than those without stirrups. Compared with different loading methods, the repetitive loading aggravated the destruction of the bond specimens and reduced the ultimate bond stress and displacement of specimens.

水泥基灌浆材料（CBGM）具有高强度，高强度和高流动性等特点。它已广泛用于建筑结构加固项目。本文提出了一项实验研究，以研究火灾后早期CBGM与钢筋在重复载荷下的粘结行为。研究了用CBGM和钢筋铸造的拉出试样的滞后行为。研究集中在不同的温度，固化时间，箍筋和加载方法对CBGM和钢筋之间粘结行为的影响。通过扫描电子显微镜（SEM）分析样品的微观形态。结果表明，在反复加载下，极限粘结应力随着温度的升高而逐渐减小，最终键位移随温度的升高先升高后降低。根据磁滞曲线，分析了固化时间，加热温度和箍筋对磁滞行为的影响。加热前固化7天的试样的粘结性能，延展性和能量耗散能力最好。当遭受火灾的早期标本继续固化28天时，CBGM的键合性能略有恢复。在相同条件下，带箍筋的试样的粘结性能，延展性和能量耗散能力要优于无箍筋的试样。与不同加载方法相比，重复加载加剧了粘结试样的破坏，并降低了最终的粘结应力和试样位移。