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建筑工程中的混凝土或钢筋混凝土构件,常常由于施工、运输、堆放、自然条件影响和受荷超载等原因出现各种类型的裂缝,如运输、堆放不当而出现的垂直裂缝;混凝土收缩或温度变化引起的收缩裂缝;钢筋保护层过薄、混凝土碳化或由于化学腐蚀(混凝土浇灌时掺入过量氯盐或静电作用)、钢筋锈蚀引起的顺筋裂缝;超载引起的斜向剪力裂缝或垂直弯曲裂缝等等。构件一旦出现裂缝,有的直接影响承载能力,有的影响刚度,有的虽然不影响强度或刚度,但由于裂缝的存在,有害介质进入缝隙,促使钢筋锈蚀而影响构件的使用寿命。因此,不论哪类裂缝都有补强、粘合和封闭的必要。
Concrete or reinforced concrete components in construction projects often have various types of cracks due to construction, transportation, stacking, natural conditions and overload, etc., such as vertical cracks that occur due to improper transportation and stacking; concrete shrinkage or temperature changes Induced shrinkage cracks; excessive reinforcement of reinforcing steel layers, carbonization of concrete or chemical corrosion (incorporating excessive chlorine salts or electrostatic effects when concrete is poured), spurious cracks caused by corrosion of steel bars; oblique shear cracks or vertical bending caused by overloading Cracks and so on. Once a component cracks, some directly affect the bearing capacity, and some affect the stiffness, and some do not affect the strength or stiffness, but due to the presence of cracks, harmful media into the gap, promote steel corrosion and affect the life of components. Therefore, no matter what kind of cracks are necessary for reinforcement, bonding and sealing.