Freeze/thaw durability of concrete with recycled demolition aggregate compared to virgin aggregate concrete

An increasing trend towards the use of sustainable processes has led to recycled materials being incorporated into concrete. It is generally recognised that crushed recycled construction aggregate material produces concrete of a lower compressive strength, when used as an aggregate replacement due to deleterious materials within the aggregate. It is generally accepted that in the UK, freeze/thaw attack is, after chloride-induced corrosion, the most common cause of concrete deterioration. This paper addresses the freeze/thaw durability of recycled aggregate concrete using a paired comparison test based upon weight loss and final compressive strength. Recycled aggregate concretewas found to be of at least equal durability to concretemanufactured with virgin aggregates. This was due to careful selection of the replacement aggregate and treatment prior to batching. Durability is an important material property and recycled aggregates need to be widely tested to gain confidence for use within the industry and this work shows future possibilities.