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Fatigue performance of PVA fibre reinforced cementitious composite overlays

Pavement maintenance and rehabilitation is as much important as the construction work itself. In this scope, applying the correct and efficient repair method is highly critical for economic and technical reasons. Depending on the damage level, many alternative repair methods exist. Using an overlay is one common method, where a new layer can be directly applied over or replace the top part of an existing pavement. This overlay can be made from asphalt or concrete as well. With the advances in the concrete technology, the long service life of concrete pavements compared to asphalt let this overlay gains importance recently. Yet, the rigid nature of concrete requires a high thickness for an overlay. In this work, Engineered Cementitious Composite (ECC) type of concrete was suggested to be used as an overlay considering its ability, with a less thickness, to reduce the reflection of the cracks from the old pavement. To testify this property, the performance of two ECC mixtures as a concrete pavement overlay was investigated under fatigue loading. Using Weibull distribution, the failure probability of these mixtures was determined, and it was shown that the mineral admixture type utilized significantly affects the fatigue performance of ECC.