超高性能混凝土室内实验拌合设备性能研究

Research on the Performance of Experimental Mixing Equipment for Ultra-High Performance Concrete

超高性能混凝土(UHPC)具有高强、高韧及高耐久的性能,在桥面铺装、建筑结构等领域有着广泛的应用,能够满足现代建筑结构不断向超重载、轻量化等方向发展的需求。目前,工程中使用的UHPC材料拌合设备种类较多,而在实验室做性能测试时采用的拌合设备一般为单卧轴强制式搅拌机,与工程实际使用的拌合设备有所差异。本文结合工程实际,分别采用小型的振动搅拌机、行星搅拌机与单卧轴搅拌机来研究UHPC材料的拌合性能,通过比较拌合时间与能耗、UHPC材料扩展度、含气量以及力学性能,综合分析了不同搅拌设备的搅拌效率。通过研究发现,三种搅拌机都能够满足UHPC材料的拌合工作,振动搅拌机和行星搅拌机与单卧轴搅拌机相比,都能够提升UHPC材料的实验室拌合效果,其中行星搅拌机的拌合效果最佳。

Ultra-High Performance Concrete (UHPC) has the properties of high strength, high toughness and high durability, and has a wide range of applications in the fields of bridge decking, building structures, etc., which can satisfy the needs of modern building structures that are constantly developing in the direction of ultra-heavy loads and lightweighting, etc. Currently, there are more types of mixing equipment for UHPC materials used in the project, but the mixing equipment used for performance testing in the laboratory is generally a single horizontal shaft forced mixer, which differs from the mixing equipment actually used in the engineering. This paper combines with the actual project, using small vibratory mixer, planetary mixer and single horizontal axis mixer respectively to study the mixing performance of UHPC, by comparing the mixing time and energy consumption, the extensibility of UHPC materials, air content and mechanical properties, and comprehensively analyzes the mixing efficiency of different mixing equipment. It is found that the three kinds of mixers are able to meet the mixing of UHPC materials, vibratory mixers and planetary mixers are both able to improve the laboratory mixing of UHPC materials compared to single horizontal axis mixers, with planetary mixers providing the best results.