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Reusing builders rubble is not that easy.First point:to handle waste one needs a waste management license.No license- no waste management.Second point:Builders rubble is not usable as a hardcore since it is of mixed origin(concrete of various grades ,plaster with wallpaper/paint on it,plastic,asbestos,heavy metals etc.) and therefore not allowed as a building material unless it had been certified .Co.Cork started an incentive to reuse builders rubble with the result that they have a huge heap of rubble that no one wants.Visible from the road when you take the southern link road around the tip in Cork city.The reason why builders do not want it-even for free-is that it is an unpredictable material.No one knows what is in it,what people in these demolished buildings stored,handled,spilled,painted on the walls.It can sag.It can burn.It can release dangerous substances like radon,pesticides etc.Metal parts can rust away,timber can rot away,plasterboard can simply dissolve,turning into mud.No engineer would take the responsibility for a building build with unknown substances resp.unknown physical/chemical behavior-lack of static calculations.
The only place where it might be of use is as a hardcore in road building.But that is after manual sorting, crushing,grading.Even the county council in Cork City is using fresh material instead for their road building projects.In the Netherlands I have seen it used as hardcore under bicycle paths,not under roads since builders won't take the responsibility,see above.In Germany it is the same situation.
In areas where there are wells or waterways it is illegal to use it,it could cause pollution to the groundwater and rivers . Asbestos fibers for example go through sand filters,in Berlin they have this problem since the town was demolished in WW2 and the material either recycled or heaped up and turned into parks and civil amenity sites.
A truckload (60 tonnes)of crushed fresh hardcore from the quarry costs around €180.- delivered incl. Vat..The delivery and the VAT make about half that price.Would you try to save €180.- ( €90.- with the material for free)
when building a house or a road for hundreds of thousands of €s total building costs and running the risk that the project collapses,people get injured etc.?For € 180.-?!Plus the fine for illegal waste trading/handling?!
If someone that irresponsible resp.that poor one
should not start building in the first place.
A good foundation is a must for a good building.Using rubbish makes the entire project doubtful.