- - 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.
- 1. Tanaka, Y., Musha, H., Tanaka, S., Ishida, M.: Durability performance of UFC sakata-mira footbridge under sea environment, FraMCoS-7, pp. 1648-1654 (2010)
- 2. Boshoff, W.P.: Cracking behavior of strain-hardening cement-based composites subjected to sustained tensile loading. ACI Mater. J. 111, 553-559 (2014)
- 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)
- 4. Kwon, S., Nishiwaki, T., Choi, H., Mihashi, H.: Effect of wollastonite microfiber on ultra-high-performance fiber-reinforced cement-based composites based on application of multi-scale fiber-reinforcement system. J. Adv. Concr. Technol. 13, 332-344 (2015)
- 5. ACI Committee 209: Prediction of creep, shrinkage, and temperature effects in concrete structures. American Concrete Institute (1997)