ABSTRACT
This paper presents an experimental study of macro synthetic fibre reinforced concretes (MSFRCs) exposed to the RABT-ZTV (train) fire curve. Large scale panels were utilised in this investigation and the procedures suggested in the EFNARC “Guidelines for testing of passive fire protection for concrete tunnel linings” were followed. Modifications were made to the suggested curing regimes to match more closely those experienced within a tunnel environment and adopted for current project fire testing requirements in Australia. A comprehensive investigation was undertaken to determine the effect of micro-PP fibre dose rate on the spalling behaviour of MSFRCs, and the subsequent effect that this had on the temperature development within the concrete section due to fire exposure. Furthermore, cores were extracted from the panels post-fire to determine its impact on the compressive and tensile strength properties of MSFRC subject to elevated temperatures. This paper provides detailed experimental results that can prove useful for the application of macro synthetic fibres within fire critical tunnel infrastructure.
