IMPROVING FLEXURAL PROPERTIES OF ULTRA-HIGH PERFORMANCE FIBER REINFORCED CONCRETE BY USING A FLOW CONTROL METHOD

摘要：

　　This paper presented a novel method to improve flexural properties of ultra-high performance fiber reinforced concrete (UHPFRC) by using one L-shape device with a narrow horizontal channel to control flow of fresh mixture.Mixtures at water-to-binder ratios of 0.22 were prepared by adding 1%, 2% and 2.5% volume of steel fibers respectively.Three fiber orientation parameters (including fiber orientation angle, fiber orientation number and fiber orientation coefficient) were evaluated quantitatively using an image analysis technique.Based on experimental results, this type of flow controlling method increased fiber orientation number and fiber orientation coefficient from 0.6-0.7 and 0.4-0.6 to 0.7-0.9 and 0.6-0.8 respectively.The best enhancement on flexural strength, toughness, deflection at modulus of rupture and maximum deflection reached 64.3%, 63.4%, 77.1% and 13.4% respectively.Moreover, this method to control fiber orientation provides a great potential for reducing the production cost of UHPFRC without degradation of flexural properties.

关键词： Ultra-high performance fiber reinforced concrete (UHPFRC) Flow control Fiber orientation Flexural properties

作者: H.H.Huang X.J.Gao

作者单位: School of Civil Engineering, Harbin Institute of Technology, Harbin, China School of Civil Engineering, Harbin Institute of Technology, Harbin, China;Key Lab of Structure Dyna

会议类型: 国际会议

会议名称: The 2nd International Conference on UHPC Materials and Structures, UHPC2018-China(第二届超高性能混凝土材料和结构国际会议)

会议地点: 福州

会议语种:英文

页码: 484-492

在线出版日期: 2018-11-07（万方平台首次上网日期，不代表论文的发表时间）