Scrap tires could gain a new purpose as ingredients for construction materials, thanks to research at Missouri University of Science and Technology.
Discarded tires are a big problem. Landfills are teeming with them and they can harbor disease-carrying mosquitos and rodents. Stockpiles of old tires also burn easily — creating fires that can quickly get out of control and may burn for months or even years.
But the longevity and resilience of scrap tires also makes them ideal for other uses.
Dr. Mohamed A. El Gawady, a researcher at Missouri S&T, is currently testing new masonry blocks made with ground tires.
“Rubber has a lot of benefits in addition to its sustainability,” says El Gawady, associate professor of civil, architectural and environmental engineering. “It’s very durable and provides good insulation. Among their many potential benefits, these new blocks could cut heating bills by 50 percent.”
ElGawady has been working with Midwest Block and Brick, a Jefferson City, Mo.-based company, to create the blocks, which are made from sand and scrap tires ground to fine particles.
These rubber-added blocks, called rubberized blocks, were constructed with a variety of ratios of sand to rubber particles before coming up with the right balance.
“The rubber makes the blocks a bit weaker, so after testing various percentages, we now only replace about 20 percent of the sand with rubber, so the blocks retain their strength,” ElGawady says.
He and his students use a compression machine to test and compare the strength of prisms built with the rubberized blocks to conventional concrete masonry blocks.
Both rubberized and conventional blocks are being tested in an environmental chamber at Missouri S&T. In the chamber, the blocks undergo cycles of extreme temperatures and humidity levels, simulating different weather conditions. The rubberized blocks are also tested under cyclic compression loads simulating earthquake loads.
“Construction with these new blocks could improve a building’s resiliency during an earthquake by acting as shock absorbers,” says ElGawady.
Related Stories
| Oct 7, 2011
GREENBUILD 2011: Otis Elevator introduces energy-efficient escalator
The energy-efficient NCE escalator from Otis offers customers substantial “green” benefits.
| Oct 7, 2011
GREENBUILD 2011: Schools program receives grant to track student conservation results
To track results, schools will use the newly developed Sustainability Dashboard, a unique web-based service that makes tracking sustainability initiatives affordable and easy.
| Oct 7, 2011
GREENBUILD 2011: Transparent concrete makes its North American debut at Greenbuild
The panels allow interior lights to filter through, from inside.
| Oct 6, 2011
GREENBUILD 2011: Growing green building market supports 661,000 green jobs in the U.S.
Green jobs are already an important part of the construction labor workforce, and signs are that they will become industry standard.
| Oct 6, 2011
GREENBUILD 2011: Dow Corning features new silicone weather barrier sealant
Modular Design Architecture >Dow Corning 758 sealant used in GreenZone modular high-performance medical facility.
| Oct 6, 2011
GREENBUILD 2011: NEXT Living EcoSuite showcased
Tridel teams up with Cisco and Control4 to unveil the future of green condo living in Canada.
| Oct 6, 2011
GREENBUILD 2011: Kingspan Insulated Panels spotlights first-of-its-kind Environmental Product Declaration
Updates to Path to NetZero.
| Oct 5, 2011
GREENBUILD 2011: Johnson Controls announces Panoptix, a new approach to building efficiency
Panoptix combines latest technology, new business model and industry-leading expertise to make building efficiency easier and more accessible to a broader market.
| Oct 5, 2011
GREENBUILD 2011: Software an architectural game changer
Interactive modeling software transforms the designbuild process.
| Oct 5, 2011
GREENBUILD 2011: Tile manufacturer attains third-party certification for waste recycling processes
Crossville has joined with TOTO to recycle that company’s pre-consumer fired sanitary ware.