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为研究钢筋锈蚀、钢筋类型和直径对钢筋与混凝土间粘结性能的影响,设计制作了变形钢筋和光圆钢筋混凝土粘结试件,并进行了实验室通电快速锈蚀。通过快速锈蚀两种粘结试件的拔出试验,得到了钢筋与混凝土间粘结应力-滑移曲线,分析了锈蚀率、钢筋直径以及钢筋类型对粘结应力-滑移曲线影响,探讨了不同锈蚀率下两种类型钢筋混凝土粘结试件破坏模式。试验研究表明:光圆钢筋与混凝土间粘结性能对钢筋锈蚀更敏感,随锈蚀率变化,其最大粘结力及相应的滑移量变化幅度更大;变形钢筋与混凝土间粘结性能对钢筋直径更敏感,锈蚀率接近的情况下,直径不同,其粘结应力-滑移曲线差异显著。
In order to study the influence of steel corrosion, type and diameter of rebar on the bond performance between steel bar and concrete, the deformed bar and the round bar bonded concrete were designed and fabricated, and the rapid galvanization in the laboratory was conducted. Through the pull-out test of two fast-corroded bonded specimens, the bond stress-slip curve between rebars and concrete was obtained. The effects of corrosion rate, rebar diameter and rebar type on the bond stress-slip curve were analyzed. Two different types of reinforced concrete specimens under different corrosion rates failure modes. The experimental results show that the bond between the round steel bar and the concrete is more sensitive to the corrosion of the steel bar. The maximum bond strength and the corresponding slip amount change more with the change of the corrosion rate. The bond between the deformed steel bar and the concrete affects the steel bar Diameter is more sensitive, the corrosion rate is close to the case of different diameter, the bond stress - slip curve significant difference.