Conclusions

This paper compares the results of creep tests performed on beams of different

widths (50, 100 and 150 mm); the following conclusions can be drawn:

  • - Stable creep tests were observed when sustained stresses near 60 % fR1 were applied on a “class 4a” steel FRC.
  • - The results show that the beam width has a minor influence in the creep behaviour of FRC in cracked state, thus the proposed method can also be applied to evaluate thin specimens.
  • - A greater variability was found in the fibre density on the cracked surfaces as the beam width decreases; as expected the residual strength capacity of the beams was directly related to the fibre density.
  • - The variability in creep behaviour appears to decrease as the beam width increases. Therefore an increase in the number of specimens is recommended in the case of thin beams.
  • - The concept of crack opening rate appears as a useful tool to evaluate the creep behaviour in cracked FRC.

Acknowledgments Funding from two projects, CONICET PIP 112-201101-00765 “Development and characterization of fibre reinforced concretes for structural applications”, and UNLP 11/I188 “Fibre reinforced concretes and their contribution to the sustainable development” is greatly appreciated. The authors specially thank the collaboration of Jorge Anile, Teobaldo Gaitan, Anabela Gerez and Pablo Bossio in the support of experimental works.

 
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