Description
The premature deterioration of concrete overlays in waste transfer stations is very common. Recently, a guideline and specification for the concrete material design for these overlays has been developed. However, the guideline applies to new constructions or resurfacing of a large area of an existing facility and does not include repair materials and methods. There are a large number of facilities across the US that require repair. The complete resurfacing of these facilities is costly and may result in revenue loss due to operational delays. Therefore, the industry is in need of repair strategies for concrete overlays. The present report addresses this need of the industry by evaluating the performance of repair materials for concrete overlays, focusing on binders and aggregates, to provide recommendations for selecting more durable materials and attempting to develop new repair strategies, resulting in cost savings in the repair process and reducing operational delays.
The overall objectives of this research are therefore (i) to investigate and compare the performance of commercially available overlay repair materials, (ii) to assess methods of enhancing resistance of concrete against organic acid attack, and (iii) to propose a preliminary design concept for precast and prestressed concrete overlay as a rapidly deployable repair strategy.
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