Influence of test methodology on the applicability of test results of fibre reinforced concrete for design
Juhasz, K.P.; Schaul, P.; Winterberg, R.
Appears on pages(s):
Synthetic fibre, FEA, panel test, testing methods
The design of fibre reinforced shotcrete (FRS) hard rock linings is commonly based on the
Q-System or Barton charts. This performance based design approach assess the results of
experimental tests, carried out on panel specimens according to existing standards or
guidelines. This is different to the general methodology to assess and determine the
performance of fibre reinforced concrete (FRC) using standardized beam tests.
Panel and beam test results yield significantly different information on the performance of
FRC and it is problematic to correlate them. The beam test yields a stress-strain relationship
for a small displacement range only. Based on the significantly different working and failure
mechanisms, structural tests to evaluate the post-crack performance and the ductility of FRS
linings are typically conducted on different types of panels rather than on traditional beams.
As a consequence, test results based on beam tests may lead to an overestimation of FRC
performance in panels and vice versa. In order to avoid uneconomic designs the most
appropriate material must be found using the most appropriate test methodology.
This paper discusses the difficulty in correlating test results obtained from beams and
panels as well as the discrepancy in performance of different FRC using different test
methodologies and aims to provide guidance on materials, testing and design.