Science

Concrete solution for recycled glass

concrete the fence july 2019

Recycled glass can be ground up and used as a substitute for sand to make a commonly used form of concrete.

Deakin School of Engineering researchers have discovered ground recycled or waste glass can be used instead of sand when making polymer concrete.

Senior engineering lecturer Dr Riyadh Al-Ameri said the addition of glass resulted in a stronger product that was less costly to produce.

“This research provides the evidence the construction industry needs to see the potential of glass as a substitute for sand when making polymer concrete and, potentially, concrete,” Dr Al-Ameri said.

“Concrete is a major construction material and sand is one of its primary components, so finding an alternative to sand makes good economic sense.

“Mined sand requires washing and grading before it is added to aggregate, cement and water to make concrete.

“We have found that substituting sand with ground recycled glass makes the polymer concrete stronger and is a sustainable use of one of the major types of recyclables in the domestic waste stream.

“Any changes that reduce the cost of production will lead to significant gains across the industry, potentially on a global scale,” Dr Al-Ameri said.

Polymer concrete is a type of concrete that uses polymers, typically resins, to replace lime-type cements as a binder. This produces a high strength, water-resistant material.

Deakin Engineering student Dikshit Modgil worked with Orca Civil Products as part of his Masters research into the suitability of recyclable glass in polymer concrete production.

Orca Director Alan Travers said the research partnership had produced results that would be useful in taking the concept further to commercialisation.

“The specific type of waste glass used in this project was unsuitable for recycling back into glass and the amount that is stockpiling is becoming a community problem,” Mr Travers said.

“The concept has even more appeal to us because of predicted shortages of natural, mined sands in the medium term.”

This article was first published in The Fence magazine.

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