Abstract: In order to explore the mechanical properties of ultra-high performance concrete (UHPC) with coarse aggregate, the effects of coarse aggregate volume contents (0 kg/m3, 280 kg/m3, 400 kg/m3, 480 kg/m3, 560 kg/m3), fiber contents (2%, 2.5%) and fiber shape (flat type, hooked-end type) on compressive strength, elastic modulus and flexural strength of UHPC have been studied in the present work. Fiber orientation coefficient and effective length of fiber were introduced to explore microscopic mechanism for the influence of coarse aggregate content on flexural strength. The results demonstrated that coarse aggregate volume content affects little on the compressive strength (0.4%—4.5%); applies significant enhancement on the elastic modulus (maximum increment 7.8%); causes negative effect to flexural strength whose decrement will be fostered due to the declined orientation coefficient and effective length induced by coarse aggregate. Increasing fiber content or adding hooked-end fiber will benefit the flexural strength, in which hooked-end fiber reinforcement has greater effect in this experiment because of the substantial increment of fiber effective length.
程俊, 刘加平, 刘建忠, 张倩倩, 张丽辉, 林玮, 韩方玉. 含粗骨料超高性能混凝土力学性能研究及机理分析*[J]. CLDB, 2017, 31(23): 115-119.
CHENG Jun, LIU Jiaping, LIU Jianzhong, ZHANG Qianqian, ZHANG Lihui, LIN Wei, HAN Fangyu. An Experimental Study and a Mechanism Analysis on Mechanical Properties of Ultra-high Performance Concrete with Coarse Aggregate. Materials Reports, 2017, 31(23): 115-119.
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2017, Vol. 31 
