大体积混凝土结构无缝施工技术应用探讨（Discussion on Application of jointless construction technology of mass concrete structure）.doc

大体积混凝土结构无缝施工技术应用探讨（Discussion on Application of jointless construction technology of mass concrete structure） This paper discusses the mass concrete structure seamless construction technology application 2008-7-28 10:00:00 source: add: [i] [name]: small core tip: in the mass concrete construction, the concrete crack control is a very important issue. Because the section size of mass concrete structure is larger, the possibility of crack caused by external load is very small. In the construction of mass concrete structure, the control of concrete crack is a very important subject. The section size of the mass concrete structure caused by external load is large, the crack possibility is very small, but due to the combined effect of cement hydration in the hydration heat release reaction caused by temperature and shrinkage, will produce large temperature stress and shrinkage stress, it will become a major factor in large volume cracks in concrete structure. The basement of Kaiyuan Plaza, two floors underground, basement floor plane size of 302.5 meters by 201.2 meters, the bottom 60 cm thick, the wall thickness of 40 cm, 20 cm thick roof, the construction technology of super long concrete structure seamless design. The concrete design grade is as follows: basement floor is C30P12; underground two floor exterior wall is C30P12; underground one floor exterior is C30P8; basement roof is C40P8. The design requirement is to meet the technical requirement of no crack and self waterproof. This study adopts ZY and ZY expansive concrete, expansive concrete application research, determine the ZY shrinkage compensating concrete mix, in the process of implementing seamless construction scheme has taken effective control measures. Seamless construction scheme design 1. design mechanism With the shrinkage compensating concrete added with ZY expansion agent as the basic material, the super long concrete structure is continuously poured with the reinforcing belt instead of the back po