在混凝土结构工程中存在的裂缝问题，是一个带着普通性且被工程界广泛关注问

Cracks in the concrete problems of structural engineering, with a general nature and is widespread concern engineering. Some crack extension could jeopardize the structural safety of the project because ultimately undermine the common structure is beginning to become the harbinger of structural damage, mainly produced by cracking load as a crack; crack can cause leakage of the project, affecting the normal daily use the steel corrosion, peeling of the protective layer, reducing the strength and hardness of concrete, serious damage to the durability of construction, shortening the life of the project, which mainly refers to the occurrence of cracks because of deformation; and cracks in the alkali-aggregate reaction and coupling causing expansion stress cracks, the cracks caused by freezing and thawing. At the same time structural cracks bigger, but also difficult to accept human visual aesthetic, causing fear and other psychological stress, affect the appearance of the building also cause difficulties for the renovation. The complexity of the mechanism for micro and macro cracks, the dynamic changes of the crack has become a problem plagued engineers and technicians.

The problem of cracks in concrete structural engineering is a problem which is widely concerned by the engineering circles with commonness. The expansion of some cracks may endanger the safety of structural engineering, because the final destruction of the structure is generally started by cracks, become a precursor to structural damage, mainly cracks produced by load; Serious damage to the durability of the project, shorten the life of the project, these mainly refers to the cracks due to deformation, as well as in the coupling of the cracks and alkali aggregate reaction expansion stress caused by the cracks, frozen melting caused by the cracks. At the same time, the structural cracks are large, but also for people's visual aesthetic difficult to accept, resulting in fear and other psychological pressure, affecting the appearance of the building also caused difficulties for decoration. For the complexity and dynamic change of the micro and macro mechanisms that produce cracks, cracks have also become a difficult problem for engineers and technicians.

The crack problem in the concrete structure engineering is a common and widely concerned problem. The expansion of some cracks may endanger the safety of structural engineering, because the final damage of structure generally starts from cracks, which become the precursor of structural damage, mainly the cracks caused by load; cracks will cause engineering leakage, affect the normal use of daily, make the reinforcement rust, peel off the protective layer, reduce the strength and hardness of concrete, seriously damage the durability of the project, shrink Short engineering service life, these mainly refer to the cracks due to deformation; and the cracks under the coupling effect and the cracks caused by alkali aggregate reaction expansion stress, and the cracks caused by freeze-thaw. At the same time, the structure with large cracks is also hard to accept by visual aesthetics, causing psychological pressure such as fear, and affecting the appearance of buildings also causes difficulties for decoration. For the complexity and dynamic change of micro and macro mechanism of cracks, cracks also become a problem for engineers and technicians.<br>