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The challenges of testing Fiber Reinforced Concrete (FRC) go well beyond what we would normally think of with respect to concrete testing. The difference lies in the fact that most of the valuable information from an FRC test comes after the concrete fails. The ability of FRC to resist crack growth after the initial crack is determined by measuring the toughness (typically area under the curve) of the sample as it is deflected well past the first crack. All of these tests must be run under servo-control and one of the more common tests must be run using the measured beam deflection as the servo feedback. This can be very challenging as the specimen goes from being very stiff to very compliant after the first crack.
Mar 01, 2012 10:10 AM