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Concrete/Cement/Mortar recycled? As in grind up a slab of concrete to dust add water and presto new concrete? Are we sure bout that? Cant be THAT easy...
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sorry, I didn't mean to imply that it would be easy, just possible...
easier would be the recycling of brinks, by scraping, chipping mortar of unbroken bricks... I believe that currently in both the US and the UK, there is a business (or was before the recent economic woes) in recycled "vintage" brick.