超高性能混凝土在中国的研究和应用

发布时间：2019-08-08 06:44

【摘要】：超高性能混凝土作为一种新型水泥基材料,具有强度高,耐久性优异的优点。本文综述了超高性能混凝土在中国的研究和应用。使用常规辅助性胶凝材料取代水泥和硅灰,在普通工艺下,也可制备出满足性能要求的超高性能混凝土。硅灰和纳米二氧化硅可加速超高性能混凝土胶凝材料的水化速度,但矿粉延缓了超高性能混凝土胶凝材料的水化速度。超高性能混凝土具有均匀致密的微观结构。超高性能混凝土的抗拉、抗弯、抗剪、粘结强度、峰值应变等均远大于普通混凝土,掺入钢纤维可显著增大超高性能混凝土的韧性。超高性能混凝土的抗冻性和抗锈蚀性能均优于普通混凝土。自从中国2005年第一次将超高性能混凝土应用于工程中,超高性能混凝土已经广泛应用于电缆槽盖板、高速铁路、地铁、桥梁、挂檐板和人行道盖板中。
[Abstract]:As a new cement-based material, ultra-high performance concrete (UPC) has the advantages of high strength and excellent durability. In this paper, the research and application of ultra-high performance concrete in China are reviewed. Using conventional auxiliary cementitious materials instead of cement and silica fume, ultra-high performance concrete can also be prepared to meet the performance requirements under the ordinary process. Silica fume and nano-silica can accelerate the hydration rate of ultra-high performance concrete cementitious materials, but mineral powder delays the hydration rate of ultra-high performance concrete cementitious materials. Ultra-high performance concrete has uniform and dense microstructure. The tensile, bending, shear, bond strength and peak strain of ultra-high performance concrete are much higher than those of ordinary concrete. The toughness of ultra-high performance concrete can be significantly increased by adding steel fiber. The frost resistance and corrosion resistance of ultra-high performance concrete are better than those of ordinary concrete. Since the first application of ultra-high performance concrete in engineering in China in 2005, ultra-high performance concrete has been widely used in cable slot cover plate, high-speed railway, subway, bridge, eaves and sidewalk cover plate.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金(51378196;U1305243)
【分类号】：TU528

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