ABSTRACT
It is universally known that buildings of concrete structure are certainly strong and solid. At present constructions are mostly reinforced concrete structure, but there still exist some problems. For example, with invasion of time and storm, cracks will gradually appear on buildings which used to have perfect appearance. At last, outer walls of buildings and decorative works are often seen tinkering, affecting the overall appearance of buildings and also leading to security problems [1]. Therefore, cracks, caused by various internal and external factors on concrete which takes the largest proportion in construction, cannot be overlooked; otherwise it will lead to unbearable consequences.
