预制钢筋混凝土构件,在混凝土开始凝结硬化到安装使用前的整个阶段中(即在构件未出厂前),常常会产生各种不同的裂缝.这种裂缝一旦产生,将降低构件的强度和刚度,不同程度地降低构件的承载能力和耐久性,同时还会影响构件的美观.因此,对预制钢筋混 Prefabricated reinforced concrete components often produce various kinds of cracks in the entire period before the concrete begins to harden and assemble until it is installed (that is, before the components are not delivered). Once this type of crack occurs, the strength and stiffness of the component will be reduced. Reducing the bearing capacity and durability of the components to varying degrees, at the same time also affect the aesthetics of the components. Therefore, the prefabricated reinforcement