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混凝土是非匀质性的多孔性材料,抗拉强度低,易产生裂缝。近年来随着高、新、尖大型工程的开发,超大体积混凝土结构日益增多,裂缝和温度问题是大体积混凝土要攻克的难题。深圳平安金融中心为世界第二高楼,主塔高度为660米。本文介绍了深圳平安金融中心4.5m厚大体积混凝土通过选用优质粉煤灰,采用超大掺量(掺量达到45%),成功控制了可见裂缝的出现,并有效的控制了混凝土的温升问题,提高了该混凝土的耐久性能。
Concrete is a non-uniform porous material, low tensile strength, easy to produce cracks. In recent years, with the development of high, new and sharp large projects, the structure of super-large-volume concrete is increasing day by day. The problems of cracks and temperature are the problems to be solved by mass concrete. Shenzhen Ping An Financial Center is the second tallest building in the world with a height of 660 meters. In this paper, the 4.5m thick mass concrete in Ping An Financial Center of Shenzhen is successfully controlled the appearance of visible cracks through the selection of high-quality fly ash and the use of ultra-high content (content 45%), and effectively controls the temperature rise of concrete , Improve the durability of the concrete.