Pit & Quarry, February 2014
ifornian aggregates gap New legislation from the European Parliament has dictated that by 2020 70 percent of all construction demolition and excavated waste material is recycled and processed into high quality recycled aggregate for use back in the construction industry This directive California consumed on average 180 million tons of mixed construction aggregate each year between 1981 and 2010 has started to change the construction and aggregates industry in the United Kingdom resulting in a more sustainable and greener initiative With the UK being such a small and densely populated island there is only so much open cast mining that can be sustained hence a need for a change in thinking something that California and other states in the U S could benefit from Convery says One recent example is the approach taken to construction for the 2012 Olympics in London The demolition of the surrounding infrastructure resulted in recycled materials providing a large portion of all the aggregates used on the construction of the Olympic Park What made this possible in the United Kingdom and why would the same approach work in the U S The introduction of washing technologies for the processing of construction demolition and excavation waste was driven by a desire in the industry to move recycled sand and aggregates up the value chain Convery says The dominant treatment method at that time was dry crushing and screening he adds but the limitations of this process mean the recycled products are only ever going to find a RECYCLED AGGREGATES home in very low value construction applications What does washing construction demolition and excavation waste do It results in much higher quality recycled materials with applications in higher value construction such as concrete and asphalt Convery says This is achieved by the effective removal of the waste silts and minus No 200 mesh material in the same way that washing is effective when processing natural sand and gravel crushed rock crusher dust and other similar materials The technology that CDE Global has been developing has been successful as a result of the ability of the system to deal with other contaminants that require removal such as plastics polystyrene metals organics and other construction debris In addition each recycling system CDE Global designs is specific to the material being processed and config www pitandquarry com February 2014 PIT QUARRY 81
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