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
| Aug 11, 2010
ZweigWhite names its fastest-growing architecture, engineering, and environmental firms
Management consulting and research firm ZweigWhite has identified the 200 fastest-growing architecture, engineering, and environmental consulting firms in the U.S. and Canada for its annual ranking, The Zweig Letter Hot Firm List. This annual list features the design and environmental firms that have outperformed the economy and competitors to become industry leaders.
| Aug 11, 2010
SSOE, Fluor among nation's largest industrial building design firms
A ranking of the Top 75 Industrial Design Firms based on Building Design+Construction's 2009 Giants 300 survey. For more Giants 300 rankings, visit http://www.BDCnetwork.com/Giants
| Aug 11, 2010
Guggenheim to host live online discussion of Frank Lloyd Wright exhibition
The Solomon R. Guggenheim Museum launches the Guggenheim Forum, a new series of moderated online discussions among experts from a variety of fields that will occur in conjunction with major museum exhibitions.
| Aug 11, 2010
Best AEC Firms of 2011/12
Later this year, we will launch Best AEC Firms 2012. We’re looking for firms that create truly positive workplaces for their AEC professionals and support staff. Keep an eye on this page for entry information. +
| Aug 11, 2010
Report: Building codes and regulations impede progress toward uber-green buildings
The enthusiasm for super green Living Buildings continues unabated, but a key stumbling block to the growth of this highest level of green building performance is an existing set of codes and regulations. A new report by the Cascadia Region Green Building Council entitled "Code, Regulatory and Systemic Barriers Affecting Living Building Projects" presents a case for fundamental reassessment of building codes.
| Aug 11, 2010
Call for entries: Building enclosure design awards
The Boston Society of Architects and the Boston chapter of the Building Enclosure Council (BEC-Boston) have announced a High Performance Building award that will assess building enclosure innovation through the demonstrated design, construction, and operation of the building enclosure.
| Aug 11, 2010
Portland Cement Association offers blast resistant design guide for reinforced concrete structures
Developed for designers and engineers, "Blast Resistant Design Guide for Reinforced Concrete Structures" provides a practical treatment of the design of cast-in-place reinforced concrete structures to resist the effects of blast loads. It explains the principles of blast-resistant design, and how to determine the kind and degree of resistance a structure needs as well as how to specify the required materials and details.
