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The Use of Recycled Material in Concrete - UKDiss. 2019-12-10 6.3 Aggregate Crushing Process. To reduce waste and reduce the carbon footprint as well as using all of the waste product, all materials larger than 20mm in size were crushed using a sledge hammer until the pieces of aggregate where broken down into sizes that could be used in the mix (Ref. Figure 21 Breaking of Aggregate).The ... Crushed stone or angular rock is a form of construction aggregate, typically produced by mining a suitable rock deposit and breaking the removed rock down to the desired size using crushers.It is distinct from naturally occurring gravel, which is produced by natural processes of weathering and erosion and typically has a more rounded shape.