What is the difference between processed road gravel and crushed concrete?

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What is the difference between processed road gravel and crushed concrete?

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A. Processed road gravel (22A and 23A) is a naturally based mined product that is crushed to create a proper base for gravel and asphalt driveways and roads. Crushed concrete (22ACC) is a recycled product from cured concrete. It is processed and crushed similar to road gravel and has many of the same properties.