Pit & Quarry, February 2014

and manufacturing aggregate through crushing technologies are two increasing alternative supply methods In the case of manufactured sands Convery says testing has found that the overall composition is critical and should include particles from 63 microns up to 475 mm in size and should not be excessively rough Having fine particles in the proper proportions across the gradient spectrum also means it has great strength and is a durable and pure product which once refined is cost effective when compared to excavated sand Manufacturers of concrete products have also found that by using manufactured sand the defects found in the manufacturing stage such as voiding segregation and honeycombing are significantly reduced This fact makes a case for this product which is found to have greater workability and creates a smoother surface finish Convery says Product consistency allows a more predictable mix to be produced and many concrete product manufacturers have found manufactured sand can result in fewer defects So from a purely commercial perspective manufactured sand is a highgrade product he says It has balanced physical and chemical properties has Recycled C D materials may be the answer states like California need great strength plus it is a durable and a pure product Whats more is it can be produced in close proximity to where it is needed which avoids lengthy and expensive transportation Takeaways If California is to overcome its aggregates issues over the next 50 years serious RECYCLED AGGREGATES changes in thought are called for In the next 50 years Convery says the consumption in that area is likely to be 12 billion tons of aggregates with permitted reserves currently standing at 4 billion tons Thats about 57 tons per person per year With California consuming about 180 million tons of material per year demands are expected to grow as the states population expands Because aggregate is a high bulk weight low unit value product it makes commercial sense to produce it locally to save adding additional transport cost on to the consumer Convery says With the processing and washing of construction demolition and excavated waste material able to recycle up to 90 percent of all material returning it for use in the construction sector close to its area of production this provides a viable commodity that would be capable of meeting the shortfall in the needs of a state like California P Q WHEN YOURE BUSTING STONES WEVE GOT YOUR BACK ING New LOCTITE PC 9020 Backing Compound has reduced odor and is far more user friendly than traditional epoxy backing systems Features Low odor low shrinkage High compression strength High impact resistance Color changing technology assures product is fully mixed Convenient kit sizes and durable metal cans Freeze thaw stable On site application support To speak to a LOCTITE Product Specialist in your area about this and other LOCTITE products or to schedule a LOCTITE Maintenance Workshop call or visit 1800 LOCTITE or 18002635043 within Canada www henkelna com mining OO PDUNV XVHG DUH WUDGHPDUNV DQG RU UHJLVWHUHG WUDGHPDUNV RI HQNHO DQG RU LWV DIÀOLDWHV LQ WKH 8 6 DQG HOVHZKHUH UHJLVWHUHG LQ WKH 8 6 3DWHQW DQG 7UDGHPDUN 2IÀFH 2013 Henkel Corporation All rights reserved 11370 10 13 www pitandquarry com February 2014 PIT QUARRY 83