How do concrete cracks of concrete cracks causes and solutions (Henan Meeting to bridge Detailed) construction factors: preparation and pouring concrete. ① pumping concrete pumping in order to satisfy the conditions necessary to increase the amount of cement and water, water-cement ratio is relatively large, easy to produce less local coarse aggregate, mortar and more phenomenon, dehydration shrinkage of concrete pavement crack repair, it will have Surface cracks. ② uneven mixing additives cause greater loss additives, can not be fully effective. ③ concrete mixing lack of time, the aggregate distribution is unreasonable, uneven shrinkage. ④ high aggregate and mixing water temperature, making the pouring temperature is too high. ⑤ mixing and transport time is too long, so that the concrete mixture appears segregation, bleeding and subsidence. ⑥ pouring incoherent, irrational order, appear Construction "cold joints" improper handling or construction joints. ⑦ pouring too fast, inadequate or excessive vibration tamping the concrete to produce segregation and bleeding on the surface of the cement content of more sand formation. ⑧ before the final setting of concrete reinforced disturbed. ⑨ concrete pouring process, failed to properly protect the floor pavement crack repair material negative reinforcement, so that the effective cross-section height is reduced. ⑩ concrete protective layer is too thin or the protective layer of the aggregate is too small. Who knows Concrete Crack Treatment Cause Analysis of Crack There are many reasons for cracks (Henan Meeting to bridge Detailed) concrete, primarily changes in temperature and humidity pavement crack repair, fragility and unevenness of concrete, and the structure is irrational, the raw materials are not Qualified (such as alkali aggregate reaction), the template deformation, uneven settlement of the foundation. During the release of a large number of concrete hardening cement hydration heat, the internal temperature rising to the surface causing tensile stress. Late in the cooling process, due to the constraints of old foundation or on coagulation, will appear in the concrete tensile stress. Reduce the temperature of the concrete surface will cause large tensile stress. When these exceed the tensile stress crack resistance of asphalt concrete pavement crack repair method that cracks will appear. Many internal changes in humidity or small concrete changes slowly, but larger changes or surface moisture may change dramatically. Such as curing the ill, when dry the wet surface deformation restrained shrinkage of the concrete, but also often leads to cracks. Concrete is a brittle material, tensile compressive strength is about 1/10 of the ultimate tensile deformation when only short-term loading (0.6 ~ 1.0) × 104, the limit bit long stretch deformation during loading only ( 1.2 ~ 2.0) × 104. Owing to the unevenness of raw materials, water-cement ratio is unstable, and transport and the process of pouring the segregation phenomenon, in the same block in the tensile strength of concrete is not uniform, there are many very tensile strength low, weak parts prone to cracks. Asphalt pavement crack repair method _ Meeting to bridge (certified) _ pavement crack repair roads and bridges can be provided by the Department of Science and Technology Co., Ltd., Henan. The Department of Science and Technology Co., Ltd. Henan can bridge (www.hnlq88.com) is Zhengzhou, chemical products leader, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In exchange can bridge the leadership with the staff warmly welcome all inquiries negotiations, foreign exchange can bridge a better future.