大量的工程实践和理论分析表明,几乎所有的混凝土结构均是带缝工作的,一般对结构的使用无大的危害,可允许存在;有些裂缝在使用荷载或外界物理、化学因素的作用下,不断产生和发展,引起混凝土炭化、保护层剥落、钢筋腐蚀,使混凝土的强度和刚度受到影响,耐久性降低。 A large number of engineering practice and theoretical analysis show that almost all of the concrete structures are stitched together, and generally have no great harm to the use of the structure and may be allowed to exist. Some fractures, under the action of loads or external physical and chemical factors, Continuous generation and development, causing concrete carbonization, protective layer peeling, steel corrosion, concrete strength and stiffness are affected, reducing durability.