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Variation in fiber volume and orientation in walls: experimental and numerical investigations
Norwegian University of Science and Technology (NTNU), Trondheim.
Risø, DTU, Division of Building and Construction, Danish Technological Institute (DTI), Taastrup.
Norwegian University of Science and Technology (NTNU), Trondheim.
Aalto University School of Engineering, Department of Civil and Structural Engineering, Finland.ORCID iD: 0000-0001-6287-2240
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Number of Authors: 52016 (English)In: Structural Concrete, ISSN 1464-4177, E-ISSN 1751-7648, Vol. 17, no 4, p. 576-587Article in journal (Refereed) Published
Abstract [en]

Previous research with fibre-reinforced slab elements has shown that the surface roughness of formwork and the presence of rebars affect fibre orientation and fibre volume distribution. This paper discusses the orientation and volume distribution of steel fibres in wall elements cast from a single point. In particular, the effect of formwork tie bars on fibre orientation and distribution was studied. To quantify the fibre orientation and distribution, numerical simulations and X-ray computed tomography were applied, and the mechanical performance was determined using three-point bending tests on sawn beams. The Thorenfeldt model (applied in the Norwegian proposal of the new fibre-reinforced concrete guideline) was used to estimate the residual flexural tensile strength based on fibre orientation and distribution. The simulation results show that the fibre orientation can be related to the flow pattern. The results indicate a large variation in fibre orientation, which was experimentally confirmed. The fibre volume distribution was mostly uniform, except for an area with fewer fibres at the casting point. The large variation in fibre orientation was reflected by a large variation in residual flexural tensile strengths. Weak zones due to anisotropic fibre orientation caused by formwork tie bars were observed.

Place, publisher, year, edition, pages
2016. Vol. 17, no 4, p. 576-587
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-9024DOI: 10.1002/suco.201500060Local ID: 795c2ede-ce80-4d6b-9975-d8dbf0f550a8OAI: oai:DiVA.org:ltu-9024DiVA, id: diva2:981962
Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Cwirzen, Andrzej

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