Abstract
Ultra-high performance, fiber reinforced concrete (UHPFRC) differs from high-performance and very-high-performance concretes by the systematic use of fibers, which ensures that the material is not brittle and modifies the conventional requirements for passive and/or active reinforcement. It is well know that several concrete properties can be improved by the addition of steel fibers. The aim of this work was to study the fatigue behavior of UHPFRC. Two Ductal™ formulas were subjected to pre-cracking under flexural loading, then fatigue flexural loading. Deflection and crack opening displacement were measured. Bending static tests were carried out on samples subjected and non-subjected to fatigue tests in order to evaluate the influence of fatigue on mechanical properties. The samples were subjected to a load level corresponding to 90% of the first crack strength for up to approximately 1 million cycles. Even after more than 1 million cycles, there was still very little damage evolution and the fatigue loading had no effect on the overall mechanical behavior. Results are analyzed in terms of structural design and at the scale of the material. It is concluded that the actual French Recommendations for UHPFRC are safe for fatigue design. In addition, a reverse analysis was used to determine the endurance level of Ductal™ in terms of equivalent pure fatigue tension.
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