混凝土是一种抗拉强度很低的脆性材料。混凝土由于受自身材质、施工、使用及维护等多方面因素的制约,不可避免地会产生各种裂缝。裂缝宽度当超过一定允许值时,被称为有害裂缝。裂缝轻则降低构件刚度,变形增大,影响承载能力,使钢筋锈蚀,造成结构不安全,影响使用;重则发生重大责任事故。因此,对这种裂缝必须采取措施,加以修补,以确保钢筋混凝土结构使用寿命和安全。 Concrete is a brittle material with low tensile strength. Concrete due to its own material, construction, use and maintenance of many constraints, will inevitably produce a variety of cracks. When the crack width exceeds a certain allowable value, it is called a harmful crack. If the cracks are light, the rigidity of the components is reduced, the deformation is increased, the bearing capacity is affected, the steel bars are rusted, the structure is unsafe, and the use is affected; when serious, serious responsibility accidents occur. Therefore, such cracks must be taken and repaired to ensure the service life and safety of the reinforced concrete structure.