Behaviour of Cement Composites with Lightweight and Heavyweight Aggregates at High Temperatures

  • Lenka Bodnarova Brno University of Technology Faculty of Civil Engineering
  • Jitka Hroudova Brno University of Technology
  • Jiri Brozovsky Brno University of Technology
  • Jiri Zach Brno University of Technology
  • Jaroslav Valek Brno University of Technology

Abstract

This paper presents new results of the research of the influenceof individual input components done on the behaviour of cementbased composite materials exposed to high temperatures. Anew approach of this research lies in combining a fraction ofbasalt fine aggregate and an aggregate base on expanded clayfor a composite material with lower volume weight and higherstrengths and a resistance to high temperatures. In the field ofdispersed reinforcement, new polypropylene fibers treated bylow temperature plasma were tested. Degradation of the structureof designed mixtures was evaluated by comparing densitychanges, mechanical and acoustic properties before and afterexposure to high temperatures. An optical microscope was usedfor determining the width of cracks caused by a thermal load.The contribution of this research was the use of non-destructivemethods for diagnostics of quality and properties of designedconcrete mixtures exposed to high temperatures.

Keywords: cement, high temperature, fire resistance, fibers, volumetric change, , mechanical properties, propagation of ultrasonic waves, modulus of elasticity, concrete
Published online
2016-11-08
How to Cite
Bodnarova, L., Hroudova, J., Brozovsky, J., Zach, J., & Valek, J. (2017). Behaviour of Cement Composites with Lightweight and Heavyweight Aggregates at High Temperatures. Periodica Polytechnica Civil Engineering, 61(2), 272-281. https://doi.org/10.3311/PPci.9365
Section
Research Article