Permeability of High Performance Concrete With the Addition of Modified Polypropylene Fibers at Elevated Temperature

Permeability of High Performance Concrete With the Addition of Modified Polypropylene Fibers at Elevated Temperature

Paper in proceedings (conference paper)

Increasing intensity of road and railway transport and thus a higher risk of accidents leads to the constant increase of safety standards in tunnels. Fire tests undertaken in past showed that increasing temperature leads to evaporation of chemically and physically bounded water and causes explosive spalling of dense high performance concrete (HPC) [1, 2]. New modified PP-fibers with melt flow index (MFI) 2500 provide required fire protection at highly reduced fiber dosage due to decrease of melt viscosity of fiber. Analysis of HPC with the addition of polypropylene fibers of different melt flow indexes and their mode of action is presented in the paper. This paper is focused on clarifying behaviour of concrete at elevated temperature with employing test set-up constructed at Institute of Building Construction and Technology, Vienna University of Technology. This test set-up allows measuring gas permeability of different building materials such as concrete, mortar or ceramic at both high temperature (up to 400°C) and pressure (up to 6 bars).

Increasing intensity of road and railway transport and thus a higher risk of accidents leads to the constant increase of safety standards in tunnels. Fire tests undertaken in past showed that increasing temperature leads to evaporation of chemically and physically bounded water and causes explosive spalling of dense high performance concrete (HPC) [1, 2]. New modified PP-fibers with melt flow index (MFI) 2500 provide required fire protection at highly reduced fiber dosage due to decrease of melt viscosity of fiber. Analysis of HPC with the addition of polypropylene fibers of different melt flow indexes and their mode of action is presented in the paper. This paper is focused on clarifying behaviour of concrete at elevated temperature with employing test set-up constructed at Institute of Building Construction and Technology, Vienna University of Technology. This test set-up allows measuring gas permeability of different building materials such as concrete, mortar or ceramic at both high temperature (up to 400°C) and pressure (up to 6 bars).

polypropylene fibers, high performance concrete, permeability, explosive spalling

polypropylene fibers, high performance concrete, permeability, explosive spalling

FIEDLEROVÁ, M.; BODNÁROVÁ, L.; BRUCKNER, H.; KIRNBAUER, J.

2017

19.11.2015

Institut für Hochbau und Technologie

Technische Universität Wien

978-3-900576-07-3

EVENT MATERIALS

1

84

91

266