ASTM C1609 remains one of the most prescribed tests for characterizing the performance of fiber reinforced concrete (FRC). Although numerous deficiencies in this test have been addressed over the years, concerns persist regarding the loading rate prescribed in the current version of the test. A test program was carried out to investigate the influence of the loading rate in ASTM C1609-2010. Normal-strength FRCs with 1.0 kg/m3 (0.11 % by volume) and 3.0 kg/m3 (0.33 % by volume) polypropylene fiber were tested. The results indicate that although the prescribed loading rate is appropriate for the 3.0 kg/m3 fiber dosage rate, it is too high for FRC with a 1.0 kg/m3 fiber dosage rate. In order to obtain a stable load-deflection curve in FRC with a 1.0 kg/m3 fiber dosage rate, a reduced loading rate was required. In the context of these findings, this paper argues that either the loading rate in ASTM C1609 should be reduced or a minimum fiber dosage rate for which the test is valid should be specified.
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