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The fatigue failure characteristics of Engineered Cementitious Composite (ECC) were investigated by four-point flexural fatigue tests in comparison with two types of Polymer Cement Mortar (PCM). The fatigue failure mechanisms were observed, and the damage evolutions were measured for all shotcreted specimens. The results showed that ECC performs the improved fatigue life and that it exhibits a bilinear fatigue stress-life relation on a semi-logarithmic scale. ECC under fatigue loading shows much more ductility than PCMs, because the failure of ECC involves the initiation of multiple cracks, the propagation of those cracks, and the localization to a single crack, while the failure of PCMs involves only the initiation of a single crack.

FLEXURAL FATIGUE FAILURE CHARACTERISTICS OF AN ENGINEERED CEMENTITIOUS COMPOSITE AND POLYMER CEMENT MORTARS