Glass to be used in making concrete

18:31, Oct 07 2011

The 4000 tonnes of partly contaminated glass at the Southern Aggregates plant near Oreti Beach will now be used by Southland company Allied Concrete.

Yesterday, Allied was awarded $190,000 by the Environment Ministry for its initiative to use crushed glass as a part-substitute for sand to make concrete.

The Southland Times reported in July that the Invercargill City Council paid Southern Aggregates, which is part of the HW Richardson Group, to take the glass, but later discovered that some of what was being delivered was contaminated.

About 4000 tonnes has been stockpiled in the past two years near the beach.

Allied Concrete general manager Bob Officer said the money would be used in a trial to prove that contaminated glass would not affect the final product.

"The glass has paper and plastic but we are confident it will not be an issue because the process will eliminate it."


The company would upgrade its batching computer system and create additional storage for the glass at its existing Invercargill, Wellington and Wanaka concrete plants to receive crushed glass early next year.

"The application for funding was first made 18 months ago but we didn't make it, we had to modify what we were trying to achieve," Mr Officer said.

"... we anticipate with the availability of a suitable glass product we could expand to other locations."

Allied Concrete would buy processed glass from a supplier.

The Times reported this week that the Invercargill City Council had assisted Southland DisAbility Enterprises with money to buy a large crusher to get rid of glass in the south.

The glass near Oreti Beach would now be crushed by Southern Aggregates and sent to it, Mr Officer said.

He was aware that Southland DisAbility Enterprises had bought a crusher and it was likely that Allied would also be interested in buying the glass (sand) product from them.

Invercargill City Council roading and solid waste manager Tom Greenwood said he was aware of Allied Concrete's grant and that he would be interested in working with the company.

"We could add value here rather than sending glass to Auckland. "

The funding comes as part of the Government's $1 million towards six environmental projects across the country, announced yesterday by Environment Minister Nick Smith.

The Southland Times