Influence of Polypropylene and Steel Fibers in Concretes Subjected to High Temperature

Abstract

The aim of the study is to improve the understanding of the influence of formulation parameters, such as type and geometry of polypropylene (PP) and steel (S) fibers, type of aggregate, cure conditions, on the behaviour of high strength concretes subjected to high temperature. Firstly different concrete compositions with various amounts of polypropylene and/or steel fibers were subjected to ISO 834 fire test. Secondly, two selected formulations were exposed to characterisation test at a heating of 0.5°C/min. The initial and residual mechanical properties, concrete mass loss and porosity were investigated. Results showed the changes in porosity, compressive and splitting tensile strength which could be due to the adding of PP and S fibers