Abstract
In this work, we study the impact of thermal damage on the physical and mechanical properties of ultrahigh-performance fiber-reinforced concrete (UHPFRC), especially on their cracking process under compressive loading. Four mixtures of UHPFRC were prepared using identical composition but reinforced with different types of fibers: mineral fibers (Steel or Wollastonite) or organic fibers (PP or PVA) and compared with that without fibers (UHPC). To induce a thermal damage on UHPFRC, the samples were subjected to temperatures ranging from 150 to 400 °C. After each degradation stage, the gas permeability and the P-wave velocity were measured. The mechanical behavior under loading has been studied using a uniaxial compression test which combines the gas permeability and the acoustic emission measurement. The results show that the melting of organic fibers at approximately 180 °C builds a tunnel across the cement paste and increases brutally the gas permeability. At 400 °C treatment, a decrease of compression strength by 30 % and of Young modulus by approximately 60 % was observed. However, we can see that the thermal damage results a decrease in the threshold of initial cracking (σ k−ci) and that of unstable cracking (σ k−pi), and this can be explained by the initiation of new cracks and their coalescence.
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Bian, H., Hannawi, K., Takarli, M. et al. Effects of thermal damage on physical properties and cracking behavior of ultrahigh-performance fiber-reinforced concrete. J Mater Sci 51, 10066–10076 (2016). https://doi.org/10.1007/s10853-016-0233-9
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DOI: https://doi.org/10.1007/s10853-016-0233-9