Equivalent thermal diffusivity of natural and recycled aggregate concrete at temperature up to 350 ⁰C

Authors

  • Izabela Hager Chair of Building Materials Engineering, Faculty of Civil Engineering, Cracow University of Technology, 24 Warszawska St. 31-155 Cracow, Poland
  • Katarzyna Mróz Chair of Building Materials Engineering, Faculty of Civil Engineering, Cracow University of Technology, 24 Warszawska St. 31-155 Cracow, Poland
  • Tomasz Tracz Chair of Building Materials Engineering, Faculty of Civil Engineering, Cracow University of Technology, 24 Warszawska St. 31-155 Cracow, Poland
  • Václav Kočí Czech Technical University in Prague, Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Thakurova 7/2077, 16629 Prague 6, Czech Republic
  • Lukáš Fiala Czech Technical University in Prague, Department of Materials Engineering and Chemistry, Faculty of Civil Engineering, Thakurova 7/2077, 16629 Prague 6, Czech Republic

DOI:

https://doi.org/10.14311/APP.2022.33.0207

Keywords:

fire, recycled concrete aggregates, temperature, thermal diffusion

Abstract

The paper presents the evolution of equivalent thermal diffusivity with temperature of concretes with natural coarse aggregates and recycled concrete aggregates. Thermal diffusivity was evaluated based on the temperature measurements made on cylindrical samples using so-called "inverse technique". Thermal diffusivity parameter was estimated for concretes manufactured with different replacement ratios of natural by recycled coarse aggregate (0, 50 and 100 %) produced by crushing the worn-out concrete pavement that was dismounted after exploitation period. The diffusivity of concrete was tested up to 350 C. The progressive decrease of thermal diffusivity was observed, and the lowest D values were obtained for higher recycled concrete aggregates content. The results were presented against the background of other authors results and referred to the D values proposed in EUROCODE 2.

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Published

2022-03-03