It depends what you are using it for really. Most of the recycled stuff is fine, as is the rubbish we get from the local Builders' merchants.
My gripe is when we are landscaping and shaping, on top of existing gear. We need finer sized granular, uniform quality stuff, that doesn't contain large amounts of random, half brick sized ducker stones etc.
Back in my teens I spent 3 weeks wheel barrowing "hardcore" to backfill a sloping garden in Harrow on the Hill. The lawn was about 15m long, 8m deep and sloped down by about 2(?)m. This stuff was concrete will rebars sticking out. Some of the lumps were about 20cm wide. Took ages to shovel the stuff in to the wheel barrow.
If it's actually been through a crusher set to a reasonable fineness then there shouldn't be any massive chunks and there should be a good amount of smaller bits down to dust. The stuff I got was basically unusually coloured MOT.
From some of the comments here it seems that some must be setting their crusher jaws wide so that the stuff basically falls through it. You can get them to run much faster if set wider, really fast if you set them as wide as the stuff coming in. Exactly the same applies to new rock, it all needs crushing whether new or recycled.
It all depends on whether the supplier is any good or not, I guess some suppliers are waste companies and are more interested in getting rid of it than its suitability for use. Mine came from a quarry with a sideline in waste recycling, so they will be familiar with the requirements. The average local skip company with a second hand crusher is probably less interested.
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