Flowability of fibre-reinforced concrete and its effect on the mechanical properties of the material |
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| Affiliation: | 1. Département de Génie Civil, Université de Chlef, Algérie/LIMATB, Université de Bretagne Sud, France;2. Université des Sciences et Technologie Houari Boumediene, Alger, Algeria;3. Clermont Université, Université Blaise Pascal, EA 3867, Laboratoire de Mécanique et Ingénieries, BP 10448, F-63000 Clermont-Ferrand, France;1. Department of Architectural Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea;2. Department of Civil Engineering, The University of British Columbia, 6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada;3. School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea;1. Department of Civil Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;2. Department of Structural Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;3. Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA;1. College of Civil Engineering, Hunan University, Changsha 410082, China;2. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO, USA;3. State Key Laboratory for Green Building Materials, China Building Materials Academy, Beijing 100024, China |
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| Abstract: | Fibre distribution is an important factor, affecting both the fresh- and hardened-state properties of concrete. The paper describes a study in which the fibre distribution and orientation were investigated by means of a suitable technique, by using a translucent fluid model with a yield stress (Carbopol 940). The observation confirmed the ability of the developed method to provide data on the orientation and distribution of steel fibres within concrete. It was showed that orientation and distribution are dependent on the yield stress of the fluid material. Concrete specimens, containing 0.5% of 35 mm long hooked steel fibres, were also cast and tested under four-point loading, in order to study the correlation between rheology, fibre distribution and the mechanical properties of steel fiber-reinforced concrete. The results confirm that the rheology of concrete has an important influence on the orientation of the fibres. The flexural strength depends on the fibre distribution and orientation and is significantly improved when the fibres are oriented in the direction of the tensile stresses fresh (concrete with good workability). On the contrary, for concrete with poor workability, an inadequate orientation of fibres occurred, leading to a poor contribution of the fibres to the flexural behaviour of the tested specimens, despite the relatively higher compression strength of the tested concrete material. |
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