Fatigue performance of engineered cementitious composites

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2016
Aleessa Alam, Burhan
The maintenance and rehabilitation of a pavement during its service life is as much important as the construction works of this pavement. In this scope, applying the correct and efficient repair method is highly critical for economic and technical reasons. Depending on the damage level of the pavement, there are many different methods that can be used to repair the pavement. The use of an overlay is one of the most common methods, where a new layer can be applied directly over or replace the top part of an existing pavement. This overlay can be made from asphalt or concrete as well. Concrete overlays are gaining importance recently, especially with the increasing use of concrete pavements. All of these can be related to the long service life of concrete pavements compared to asphalt. However, because of the rigid nature of concrete the thickness of this overlay is higher. In this work, ECC type of concrete was suggested to be used as an overlay because with a less thickness it has the ability to reduce the reflection of the cracks from the old pavement and the overlay. To testify this property, the performance of two ECC mixtures as a concrete pavement overlay was investigated under fatigue loading. Along with that, the fatigue performance of ECC mixtures of different compositions was examined. Moreover, using Weibull distribution the failure probability of these mixtures under fatigue was determined. In addition to this, to reduce the time of the fatigue examination two new fatigue life prediction methods were suggested.