International Round-Robin Test on Creep Behaviour of FRC - Part 2: An Overview of Results and Preliminary Conclusions

Abstract

AbstractThe International Round Robin Test (RRT) on the creep behaviour of Fibre Reinforce Concrete (FRC) cracked specimens organised by the RILEM Technical Committee 261-CCF was outlined in the BEFIB2016 Proceedings. The objective of this paper is to present an overview of the results and preliminary conclusions derived from the RRT four years later. A total of 124 specimens with either steel or macro-synthetic fibres were tested in 16 different laboratories spanning across 5 continents and following four methodologies: flexural creep of small-scale prisms, direct tension creep and flexural creep of both square and round panels. Shrinkage and creep in compression were also assessed. Specimens were subjected to sustained load for 360 days. Then, they were unloaded and left to rest for 30 days to assess the creep recovery. Finally, specimens were tested to failure to assess the residual behaviour after one-year creep test. Although a general guideline was defined for the testing procedure, each laboratory had slightly different equipment and methodology. RRT results supported the identification of the main parameters affecting the creep results. Different variables, delayed deformations, methodologies and procedures, equipment and some parameters calculated from RRT results were analysed. The preliminary conclusions from the RRT are summarised hereafter.KeywordsRound-Robin TestFibre Reinforced ConcreteCreepCracked sectionsSteel fibresMacro-synthetic fibres