地下室外墙板裂缝产生的原因和防止裂缝产生的技术措施（Causes of cracks in basement exterior wall panels and technical measures for preventing cracks）.doc

地下室外墙板裂缝产生的原因和防止裂缝产生的技术措施（Causes of cracks in basement exterior wall panels and technical measures for preventing cracks） Causes of cracks in basement exterior wall panels and technical measures for preventing cracks Causes of cracks in basement exterior wall panels and technical measures for preventing cracks Maoyiping 1 Preface Concrete is the largest contemporary man-made materials, is also the most important building materials, the application of a wide range of large, almost the entire network engineering field, plays an important role in building and construction projects. With the increase of large and super large buildings, demand more and more concrete, but with the increase of amount of concrete, concrete defects are gradually exposed, caused irreparable damage to buildings and engineering. The most common occurrence of the project is the concrete temperature difference cracks caused by the hydration heat produced by the hydration of mass concrete and the through cracks produced by the basement wall panels due to the dry shrinkage of concrete. The causes and prevention measures of mass concrete cracking have been described in many articles. The construction measures of mass concrete are also clearly defined in construction specifications. In Shanghai, 70 and 80% of basement buildings have cracks in basement exterior wall panels, but the causes and prevention measures of cracks in basement wall panels are seldom described in detail. This article only on this issue, to explore the internal and external basement wall slab cracks, combined with the volume change of cement stone construction measures and structure etc, so as to seek technical measures to reduce crack. 2 causes of cracks in basement wall panels 2.1 volume change of cement stone The volume change of cement stone is a very important performance index, and there are many factors affecting the cement volume change, here only on cement hydration process caused by the volume change of cement stone in