Researchers have turned to an ancient Roman concrete recipe to develop more durable concrete that lasts for centuries and can potentially reduce the carbon impact of the built environment.
To construct architectural marvels that still stand today, ancient Romans combined lime, volcanic ash, and aggregates with water to create concrete. A key difference from how modern concrete is processed is temperature.
Today, we use cold mixing—a process conducted under ambient temperatures—but Romans used hot mixing, heating the mixture to 180 degrees Fahrenheit. This resulted in a key change in the lime that provides concrete with the ability to self-heal.
“Due to hot mixing and creation of these tiny granules of lime due to hot mixing, eventually you create a mechanism that just naturally goes and fills the crack with the material and prevents water to flow and propagation of the crack,” an MIT professor told National Public Radio. If modern manufacturers can emulate the ancient method, the result would be longer lasting structures that in the long run will result in using less concrete which will correspond to less emissions.
Listen to the NPR Weekend Edition segment:
Related Stories
| Aug 11, 2010
Rice concrete can cut greenhouse emissions
Rajan Vempati of ChK Group, Inc. in Plano, Texas, and a team of researchers found a way to make nearly carbon-free rice husk ash for concrete, which can lead to a boom in green construction.
| Aug 11, 2010
AGC: Construction unemployment reaches 19.2%
Unemployment in the construction sector climbed to a “horrendous” 19.2 percent (not-seasonally adjusted) as an additional 59,000 construction workers lost their jobs in May according to new federal data, said construction economist Ken Simonson today.
| Aug 11, 2010
USGBC’s Greenbuild 2009 brings global ideas to local main streets
Save the planet with indigenous knowledge. Make permanent water part of your life. Dive deep water for clues to environmental success. Connect site selection to successful creative concepting. Explore the unknown with Discovery Channel’s best known guide. These are but a few of the big ideas participants can connect to at USGBC’s Greenbuild International Conference and Expo, taking place on November 11-13, 2009 in Phoenix, Ariz.
| Aug 11, 2010
Urban Land Institute honors five 'outstanding' developments in Europe, Middle East, and Africa
Five outstanding developments have been selected as winners of the Urban Land Institute (ULI) 2009 Awards for Excellence: Europe, Middle East, and Africa (EMEA) competition. This year, the competition also included the announcement of two special award winners. The Awards for Excellence competition is widely regarded as the land use industry’s most prestigious recognition program.
| Aug 11, 2010
American Concrete Institute forms technical committee on BIM for concrete structures
The American Concrete Institute (ACI) announces the formation of a new technical committee on Building Information Modeling (BIM) of Concrete Structures.
| Aug 11, 2010
Former Colorado Governor Bill Owens retained by PCL Construction as senior advisor
Bill Owens, former Colorado Governor, has been retained by PCL Construction as senior advisor for the company’s U.S. operations, headquartered in Denver, Colorado. The PCL family of companies collectively form the seventh largest contracting organization in the U.S. with major offices in 29 locations across North America, the Hawaiian Islands, and the Caribbean.
| Aug 11, 2010
Proposed EPA regulations threaten thousands of jobs, says Portland Cement Association
A proposed hazardous air pollutant regulation for the cement industry undermines the balance between environmental protection and economic viability, according to statements the Portland Cement Association (PCA) is issuing this week at a series of public hearings.
| Aug 11, 2010
Green consultant guarantees LEED certification or your money back
With cities mandating LEED (Leadership in Energy and Environmental Design) certification for public, and even private, buildings in growing numbers, an Atlanta-based sustainability consulting firm is hoping to ease anxieties over meeting those goals with the industry’s first Green Guaranteed.
| Aug 11, 2010
Skanska, Turner most active in U.S. hotel construction, according to BD+C's Giants 300 report
A ranking of the Top 50 Hotel Contractors based on Building Design+Construction's 2009 Giants 300 survey. For more Giants 300 rankings, visit http://www.BDCnetwork.com/Giants
