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混凝土因其取材广泛、价格低廉、抗压强度高、可浇筑成各种形状,并且耐火性好、不易风化、养护费用低,成为当今世界建筑结构中使用最广泛的建筑材料。有些裂缝在使用荷载或外界物理、化学因素的作用下,不断产生和扩展,引起混凝土碳化、保护层剥落、钢筋腐蚀,使混凝土的强度和刚度受到削弱,耐久性降低,严重时甚至发生垮塌事故,危害结构的正常使用,必须加以控制。
Due to its wide range of materials, low cost, high compressive strength, concrete can be poured into a variety of shapes, and good fire resistance, easy weathering, low maintenance costs, become the world’s most widely used architectural building materials. Some cracks in the use of load or external physical and chemical factors under the action, continue to produce and expand, causing concrete carbonization, protective layer peeling, steel corrosion, the concrete strength and stiffness weakened, reduced durability, or even serious collapse accident , Endanger the normal use of the structure, must be controlled.