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钢筋锈蚀引起的混凝土保护层锈胀开裂时间是工程技术人员对钢筋混凝土结构进行维修加固决策的关键.为合理准确的预测混凝土保护层锈胀开裂时间,采用厚壁筒理论,假设圆筒内壁钢筋表面位置处存在2条初始径向裂纹,混凝土裂缝尖端的应力强度因子为钢筋与混凝土接触面完全光滑和理想粘结2种情况下应力强度因子的线性组合,通过断裂韧度与最大荷载的关系建立了考虑混凝土结构初始缺陷和微裂缝的临界锈胀力预测模型,进而提出了一种同时考虑界面间隙和钢筋锈损厚度混凝土保护层锈胀开裂时间的预测方法,并对方法的有效性进行了初步验证.该方法的显著特点在于,通过确定实验常数α,既适用于光圆钢筋又适用于变形钢筋情况下的混凝土耐久寿命预测.
Reinforced concrete corrosion caused by rust corrosion cracking time is the key engineering and technical personnel to reinforce the reinforced concrete structure of the decision.For a reasonable and accurate prediction of concrete cover rust cracking time, the use of thick-walled cylinder theory, assuming the cylinder wall reinforcement There are two initial radial cracks on the surface, and the stress intensity factor at the crack tip is a linear combination of stress intensity factors under the two conditions of completely smooth and ideal bond between steel bar and concrete. Through the relationship between fracture toughness and maximum load A predictive model of critical corrosion force considering the initial defects and the micro-cracks of concrete structures was established. Then a prediction method was proposed to consider both the interfacial clearance and the corrosion cracking resistance of the concrete cover during the corrosion process. The effectiveness of the method was also evaluated The primary characteristic of this method is that it can be applied to the prediction of the durable life of concrete under the condition of both round bar and deformed bar by determining the experimental constant α.