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
| May 14, 2013
Paints and coatings: The latest trends in sustainability
When it comes to durability, a 50-year building design ideally should include 50-year coatings. Many building products consume substantial amounts of energy, water, and petrochemicals during manufacture, but they can make up for it in the operations phase. The same should be expected from architectural coatings.
| Apr 23, 2013
Building material innovation: Concrete cloth simplifies difficult pours
Milliken recently debuted a flexible fabric that allows for concrete installations on slopes, in water, and in other hard to reach places—without the need for molds or mixing.
| Apr 19, 2013
Must see: Shell of gutted church on stilts, 40 feet off the ground
Construction crews are going to extremes to save the ornate brick façade of the Provo (Utah) Tabernacle temple, which was ravaged by a fire in December 2010.
| Mar 29, 2013
Shenzhen projects halted as Chinese officials find substandard concrete
Construction on multiple projects in Guangdong Province—including the 660-m Ping'an Finance Center—has been halted after inspectors in Shenzhen, China, have found at least 15 local plants producing concrete with unprocessed sea sand, which undermines building stabity.
| Mar 4, 2013
Legendary structural engineer Gene Corley passes away at 77
CTLGroup, an expert engineering and materials science firm located in Skokie, Illinois, is saddened by the news that W. Gene Corley, Ph.D., S.E., P.E., Senior Vice President, died on March 1, 2013 after a brief battle with cancer.
| Feb 25, 2013
Turner employs rare 'collapsible' steel truss system at Seattle light rail station
To speed construction of the $110 million Capitol Hill Station light-rail station in Seattle, general contractor Turner Construction will use an unusual temporary framing method for the project's underground spaces.
| Feb 22, 2013
Dutch team's 'bioconcrete' can heal itself
Two researchers from Delft Technical University in Holland have developed a self-healing cement that can stop microcracks from forming in concrete.
| Jan 3, 2013
5 things you should know about decorative concrete
Designing and installing decorative concrete is a lot more difficult that you might think. A veteran of many such installations offers a handful of tips to help you plan your next decorative concrete project.
| Sep 24, 2012
Reed Construction completes Lafarge headquarters in Chicago
Reed Construction was contracted to complete the full third floor build-out which included the construction of new open area work space, private offices, four conference rooms with videoconferencing capabilities and an executive conference boardroom.
| Aug 30, 2012
Holcim (US) announces new Deputy Chief Executive Officer
Ruiz began his career with the Holcim Group in 1986 as electrical supervisor with Holcim Apasco, Mexico, later becoming plant manager.
