Research And Application On High Performance Super Thick Slab Concrete

In resent years,along with the of development economy,the application of high-rise building construction is already and gradually extensive, and brought new challenge to construction building technique. As the building is getting higher and higher and the planceer is getting thicker and thicker, the planceer is often cracked by temperature stress in project practice. So that the research on the construction technique to the mass concrete of super thick planceer of high-rise building has got the very important engineering meaning.This dissertation mainly has a research on the control of temperature stress and temperature strain in super thick mass concrete planceer of high-rise building. Because the cracks of super thick mass concrete planceer of high-rise building is mainly caused by temperature stress and temperature strain, we have an emphasis research at the change of the temperature stress of super thick mass concrete planceer, study the construction technique how to prevent mass concrete planceer from appearing the crack's, and provide a viable fulfillment experience.In this paper, the super thick planceer of mass concrete of high-rise building with ten characteristics comparing with the common reinforced concrete, according to the above characteristic from three project, and the form project, elaborate the construction characteristics of super thick mass concrete planceer of high-rise building, have a detailed explanation of the big reinforcing bar link technique and the pump technique of the prepared concrete. Hydration heat of super thick slab concrete was studied by changing its water-cement ratio, slag content, admixtures content, and as the water-cement ratio is 0.41, slag content is 30%, compound admixtures, the Hydration heat of super thick slab concrete was the lowest, and the inside and out side temperature was 18℃. It is found in researching the carbonation of super thick slab concrete that the carbonation depth of super thick slab concrete increased as the water-cement ratio increased. When the water-cement ratio was low, the the carbonation depth of super thick slab concrete hardly changed with the development of the hydration age, so the low water-cement ratio was the key factor of the durability of the super thick slab concrete.When the water-cement ratio was the same, the carbonation depth of super thick slab concrete increased as the slag content increased, however, it hardly affected the carbonation depth of super thick slab concrete as the water-cement ratio was low.Finally this paper takes the Shen Yang Maoye building 8.8 metre thick planceer construction for example, elaborate how to make use of the above theories result in the mass concrete super thick planceer of high-rise building. Mainly from how to calculate the temperature stress of mass concrete, how to calculate the thickness of concrete bar engineering, the form engineering, how to send and curing concrete, how to monitor mass concrete internal temperature. Through project practice and many examinations, it is proved again that the temperature stress calculate formula provided in the paper is dit for the fact, it is proved again that five technique measures to prevent the temperature crack of mass concrete provided in the paper is useful.