Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 188, Issue -, Pages 709-721Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2018.08.146
Keywords
Ultra-high performance concrete (UHPC); Flow control; Fiber orientation; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51578192]
- National Key R&D Program of China [2017YFB0309901]
- Initial Fund of Ningbo University of China [011-421805030]
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In order to improve mechanical properties of ultra-high performance concrete (UHPC), one L-shape device with a narrow horizontal channel was developed to control the flow of fresh mixture and then the orientation of steel fibers was significantly improved. Mixtures with water-to-binder ratios of 0.20. 0.22 and 0.24 were prepared by introducing steel fibers with 1%. 2%, and 2.5% of the total volume respectively. Three fiber orientation parameters (fiber orientation angle, fiber orientation number and fiber orientation coefficient) were quantitatively evaluated by the image analysis method. Based on experimental results, mechanical properties (compressive strength. flexural strength, toughness, deflection at modulus of rupture and maximum deflection) were notably increased with the higher dosage of steel fibers. Compared with specimens prepared by a direct cast, this flow control method improved fiber orientation number and fiber orientation coefficient from 0.6 to 0.7 and 0.4-0.6 to 0.7-0.9 and 0.6-0.8 respectively. The best improvement on flexural strength, toughness, deflection at modulus of rupture and maximum deflection reached 64.3%, 65.1%, 77.1% and 14.9% respectively. Based on experimental results, linear relationships were regressed for fiber orientation parameters and mechanical properties of UHPC. Therefore, a potential method was developed to improve the reinforcement effect of steel fibers in UHPC. (C) 2018 Elsevier Ltd. All rights reserved.
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