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负温高强泵送砼(High Strength pumpingConcrete at minus-temoerature 简写为HSPCMT)系指能在负温下硬化且强度随负温令期的延长持续发展、混凝土不受冻害且硬化后的砼物理力学性能及耐久性不受损害,而施工时具有相当可泵性的大流动高强泵送砼,其基本组成为组成高强砼的胶结料、粗细骨料、水再加上第五组份高强砼专用负温防冻泵送剂。由于负温的冻害作用是限制高强砼强度发展的主要因素,这样导致,目前实际工程所控制的水平为-10℃,50MPa。因此,随着高层建筑、大跨度桥梁结构,海上坚井平台、钢筋砼组合筒体结构发展,在严寒地区高层结构及市政桥函、道路建设发展的情况下,对于中国的北方地区研究负温高强混凝土的性能势在必行,且从世界范围内对高强砼的应用情况来看,也应将负温高强砼列入其研究的一个分支。1.负温下研究高强混凝土的技术关键1.1关键的处加剂技术:负温高效防冻剂或负温高效防冻泵送剂为负温高强砼在寒冷气候下强度发展关键,同时,也是防止砼受冻
High strength pumping Concrete at minus-temoerature (HSPCMT) is a type of concrete that can be hardened at a negative temperature and whose strength develops with the prolongation of the negative temperature. The concrete is free from frost damage and the physical and mechanical properties of the hardened concrete And the durability is not impaired, while the construction has quite pumpable high flow high-strength pumping concrete, the basic composition of the composition of high-strength concrete cementitious material, coarse and fine aggregate, water together with the fifth group of high-strength concrete dedicated negative Temperature antifreeze pumping agent. As negative temperature frost damage is to limit the development of high strength concrete strength of the main factors, resulting in the current actual level of control of the project is -10 ℃, 50MPa. Therefore, with the development of high-rise buildings, long-span bridge structures, offshore shaft platforms and reinforced concrete combination cylinder structures, under the conditions of high-rise structures and municipal bridge letters and road construction in severe cold regions, negative temperatures for northern China The performance of high-strength concrete is imperative, and from the worldwide application of high-strength concrete point of view, it should also be negative temperature high-strength concrete included in its study of a branch. 1. Negative temperature of the key technology of high-strength concrete 1.1 The key at the additive technology: negative temperature and efficient antifreeze or negative temperature and efficient antifreeze pump for negative temperature and high strength concrete in the cold climate strength development key, but also to prevent concrete Frozen