<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Ultra-high performance concrete might be a competitive alternative to normal concrete for some purposes. But despite research efforts during decades, utilisation is still not widespread. Reasons include limited competence and material availability. This paper presents one step of a research initiative aimed at facilitating the use of UHPC in Norway. The step presented here comprises the accumulated results from investigations on the influence steel fibres (content, type, and hybrid combination) have on material strength and deformation behaviour of locally produced UHPC, made with constituents found in southern Norway. 231 specimens were tested, spanning nine UHPC mixes. Digital Image Correlation (DIC) was successfully used to study crack propagation. Compressive strength of 166 MPa and E-modulus of 46 GPa were obtained, not being influenced by fibre content. The flexural tensile strength was found to be strongly dependent on variations in steel fibre properties and mix design. The highest flexural tensile strength was obtained for prisms with micro straight steel fibres alone, or in 50% combination with macro hooked-end fibres. The experimental results are considered in a theory-informed discussion. Suggestions are made on the use of steel fibres in locally produced UHPC, potentially lowering the cost by 30%.</p></abstract>

Ultra-high performance concrete might be a competitive alternative to normal concrete for some purposes. But despite research efforts during decades, utilisation is still not widespread. Reasons include limited competence and material availability. This paper presents one step of a research initiative aimed at facilitating the use of UHPC in Norway. The step presented here comprises the accumulated results from investigations on the influence steel fibres (content, type, and hybrid combination) have on material strength and deformation behaviour of locally produced UHPC, made with constituents found in southern Norway. 231 specimens were tested, spanning nine UHPC mixes. Digital Image Correlation (DIC) was successfully used to study crack propagation. Compressive strength of 166 MPa and E-modulus of 46 GPa were obtained, not being influenced by fibre content. The flexural tensile strength was found to be strongly dependent on variations in steel fibre properties and mix design. The highest flexural tensile strength was obtained for prisms with micro straight steel fibres alone, or in 50% combination with macro hooked-end fibres. The experimental results are considered in a theory-informed discussion. Suggestions are made on the use of steel fibres in locally produced UHPC, potentially lowering the cost by 30%.

Locally Produced UHPC: The Influence of Type and Content of Steel Fibres

M.Sc, PhD Research Fellow, Department of Engineering sciences, Faculty of Engineering and Science

Professor, Department of Engineering sciences, Faculty of Engineering and Science

Nordic Concrete Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Locally Produced UHPC: The Influence of Type and Content of Steel Fibres"}

Ultra-high performance concrete might be a competitive alternative to normal concrete for some purposes. But despite research efforts during decades,...

Locally Produced UHPC: The Influence of Type and Content of Steel Fibres

Published Online: Jul 17, 2021

Page range: 31 - 52

Received: Mar 26, 2021

Accepted: May 27, 2021

DOI: https://doi.org/10.2478/ncr-2021-0003

Keywords
Ultra-High Performance Concrete (UHPC), Local materials, Material properties, Steel fibres, Digital Image Correlation (DIC)

© 2021 Ingrid Lande et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Locally Produced UHPC: The Influence of Type and Content of Steel Fibres

Published Online: Jul 17, 2021

Page range: 31 - 52

Received: Mar 26, 2021

Accepted: May 27, 2021

DOI: https://doi.org/10.2478/ncr-2021-0003

KeywordsUltra-High Performance Concrete (UHPC), Local materials, Material properties, Steel fibres, Digital Image Correlation (DIC)

© 2021 Ingrid Lande et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Ultra-High Performance Concrete (UHPC), Local materials, Material properties, Steel fibres, Digital Image Correlation (DIC)