混凝土裂缝处理方法（Concrete crack treatment method）.doc

混凝土裂缝处理方法（Concrete crack treatment method） Concrete crack treatment method The article appeared in: 2009-9-30 10:50:29 I. Preface Concrete is a heterogeneous brittle material made of sand aggregate, cement, water and other applied materials. Because of a series of problems, such as concrete construction, deformation and restraint, concrete cracks have become the most common engineering diseases in civil engineering, water conservancy, bridges and tunnels. There are many micropores, cavitation and micro cracks in concrete hardening, it is because of these early concrete buildings and structures are usually working with seam, due to the existence and development of cracks will usually produce the internal corrosion of steel and other materials to reduce the bearing capacity, durability and impermeability of concrete materials the influence of the building appearance, service life, will be a serious threat to peoples life and property. Two, hydraulic structure cracks factors There are many causes of concrete cracks, and cracks in hydraulic structures are mainly as follows: (1) in the course of hardening, cracks caused by dry shrinkage due to the volume deformation are restrained, and the width of the cracks can sometimes be great, even throughout the whole component. (2) the large amount of hydration heat produced by mass concrete hydration can not be distributed, resulting in greater temperature difference inside and outside the concrete, causing the deformation of concrete to exceed the limit and causing cracks. (3) in thickness larger, because the plastic collapse caused by concrete cracks. (4) when there are constraints, volume expansion and contraction of the concrete heat generated, because of binding restrictions on internally generated due to temperature stress, the tensile strength of concrete is low, easy to be caused by temperature stress cracking, so as to produce temperature crack. Cracks caused by solar exposure are also the most common phenomenon in engi