Christian wrote on Apr 02, 2015 03:11:
Owen- good topic. Doug- very good and accurate intsghis. Now you are seeing why in Europe and definitely in the UK there is virtually no such thing as carry-back. The driver is going to completely off-load and wash his truck ON-SITE and contractors musyt be prepared for such. Do a little internet work and gather the address of plants in the UK, then go to Google Maps and look at them. Chances are you will not find any area or equipment for handling waste concrete becuase they dont have any. Like everything in this business, that is a generalization. I can name a number of locations where exactly the opposite applies but they are prepared for it. There are a number of sites in the UK (and Belgium and the Netherlands for that matter) where they either have a reclaimer OR they are on a crushing site (whether recycling or virgin material) and discharge the carry-back into crushing piles. The one thing you so rarely see, which as we know is the most common in the US, is carry-back just poured out on the ground to be dealt with later. Owen I apologize for not addressing your core interest of cost. I get where you are going with this and you are on the right track; do something different. One very critical point to be made about cost; it doesn't matter how many times you handle the material or what the cost is if you dont make good quality usable material it is a wasted effort anyway. Time after time we see concrete being crushed either by quarrymen or by contract crushers that makes more dust and mess than usable product. You have to keep in mid that often what you get in carry-back or wash out is lower in course aggregate and higher in cementitous materials. This means it creates a large amount of fines and or dust. If one doesn't take this into account they will have a big mess and far less usable material then they planned. Thereby the cost of recycled concrete aggregate is almost always far greater than truly known or expected.
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