大体积混凝土施工方法（Construction method of mass concrete）.docVIP

大体积混凝土施工方法（Construction method of mass concrete） Construction scheme of mass concrete I. General Situation of the project This project is a collection of commercial, office and apartment as one of the modern building, one floor underground and twelve floors, a total construction area of more than 9000 square meters. The structure type is frame supported shear wall structure. The basement for the fire pool, water pump room, distribution room and generator room, from one to three layers, mainly commercial and office space, four from the apartment. This project is part of the basement foundation by vibrating cast-in-place pile raft foundation, pile cap design bottom elevation of -4.5 meters, the thickness of the base is 500, the C40 leakage concrete anti permeability level is S8, the amount of concrete foundation slab is about 1000 cubic meters. Plan base slab concrete irrigation time for a calendar day. Two 、 construction preparation work Mass concrete construction technology requirements are relatively high, especially in construction, to prevent concrete due to cement hydration heat difference caused by temperature stress cracks. Therefore, it is necessary to make sufficient preparations from the aspects of material selection and technical measures to ensure the smooth construction of mass concrete in the base slab. 1, material selection (1): cement heat of hydration of Portland cement is considered high, especially applied to the large volume of concrete, large amount of cement hydration heat is not easy to radiate in the concrete internal temperature is too high, and the concrete surface will produce large temperature difference, concrete compressive stress produced in the surface to produce tensile stress. When the surface tensile stress exceeds the tensile strength of concrete early will produce temperature crack, so we decide to use the slag Portland cement hydration heat low, labeled 525#, performance by adding appropriate additives can improve the concrete, i