page_title: Recycling by product
section_title: Aggregates and concrete
hierarchical_section_title: Recycling by product / Building and construction waste / Aggregates and concrete
caption_attribution_description: 8 " x 8" x 16" stretcher concrete blocks
context_page_description: Products made from a variety of materials can be recycled using a number of processes.
context_section_description: Concrete aggregate collected from demolition sites is put through a crushing machine, often along with asphalt, bricks, dirt, and rocks. Smaller pieces of concrete are used as gravel for new construction projects. Crushed recycled concrete can also be used as the dry aggregate for new concrete if it is free of contaminants. Builder's rubble (like broken down bricks) is also used for railway ballast and gravel paths. This reduces the need for other rocks to be dug up, which in turn saves trees and habitats.
caption: Concrete blocks in Germany.
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