Influence of high temperature on the mechanical properties of hybrid fibre reinforced normal and high strength concrete. (20th January 2018)

• Record Type: Journal Article
• Authors: Varona, F.B.; Baeza, F.J.; Bru, D.; Ivorra, S.
• Is Part Of: Construction & building materials. Volume 159(2018)
• Page Start: 73
• Page End: 82
• Publication Date: 2018-01-20
• Subjects: High strength concrete -- High temperature -- Residual properties -- Steel fibre -- Polypropylene fibre -- Hybrid fibre; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.10.129
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Synergy of polypropylene & steel fibres has similar evolution at high temperature. Higher aspect ratio steel fibres could be more prone to lose bond to the matrix. Steel fibres in HSC may not provide the same ductility at high temperature. Design equations for properties at high temperatures have been proposed. Abstract: The current version of the European standard for concrete structures gives tabulated data for the evolution of the mechanical properties of normal strength concrete subjected to elevated temperatures. However, the standard acknowledges the lack of sufficient data for the case of high strength concrete with limestone aggregate and there are no provisions for fibre reinforced concrete at high temperatures. This paper presents the experimental results obtained on six batches of normal and high strength fibre reinforced concrete made with limestone aggregates and tested after exposure to high temperatures. These results gave a good correlation with previous researches and equations were obtained to describe the evolution of the compressive strength and the flexural strength at elevated temperatures. Ductility was also measured in the flexural strength tests and results suggested that the use of steel fibres with higher aspect ratio may lead to lower ductility after exposure to temperatures higher than 650 °C.