Conclusions

  • - UHP-FRCC with multi-scale fiber-reinforcement system showed hardening behavior under 4-point bend test. The bending strength was much higher than the conventional FRCC employed in the RRT organized by RILEM TC 261-CCF.
  • - Creep deformation and creep coefficient of UHP-FRCC up to 28 days was much smaller than the conventional FRCCs, although the average curvature of UHP-FRCC specimen was 9 times than that of FRCCs. In particular, the creep coefficient of UHP-FRCC(28) series was below 0.3.

- During creep loading, deformation of the UHP-FRCC was a consequence of the generation new narrow cracks, as well as the slightly widening of the initial cracks. In other words, the creep deformation of UHP-FRCC can be recognized as hardening behavior under static sustained loading.

Acknowledgments This work was partially supported by JSPS KAKENHI Grant Number 25630228, 26289186 and 26-7167. The authors would like to express their deep gratitude.

References

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  • 3. Kwon, S., Nishiwaki, T., Kikuta, T., Mihashi, H.: Development of ultra-high-performance hybrid fiber-reinforced cement-based composites. ACI Mater. J. 111 (2014)
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