Thus far, the new construction material has been produced only at a lab scale, using 3-D printers to shape it into tiny cones. “We have proof of concept that we can do this,” DeShazo said. “But we need to begin the process of increasing the volume of material and then think about how to pilot it commercially. It’s one thing to prove these technologies in the laboratory. It’s another to take them out into the field and see how they work under real-world conditions.”
“We can demonstrate a process where we take lime and combine it with carbon dioxide to produce a cement-like material,” Sant said. “The big challenge we foresee with this is we’re not just trying to develop a building material. We’re trying to develop a process solution, an integrated technology which goes right from CO2 to a finished product. 
“3-D printing has been done for some time in the biomedical world,” Sant said, “but when you do it in a biomedical setting, you’re interested in resolution. You’re interested in precision. In construction, all of these things are important but not at the same scale. There is a scale challenge, because rather than print something that’s 5 centimeters long, we want to be able to print a beam that’s 5 meters long. The size scalability is a really important part.”
Another challenge is convincing stakeholders that a cosmic shift like the researchers are proposing is beneficial—not just for the planet, but for them, too. 
“This technology could change the economic incentives associated with these power plants in their operations and turn the smokestack flue gas into a resource countries can use, to build up their cities, extend their road systems,” DeShazo said. “It takes what was a problem and turns it into a benefit in products and services that are going to be very much needed and valued in places like India and China.”
DeShazo cited the interdisciplinary team of researchers as a reason for the success of the project. “What UCLA offers is a brilliant set of engineers, material scientists and economists who have been working on pieces of this problem for 10, 20, 30 years,” he said. “And we’re able to bring that team together to focus on each stage.”
According to Sant, UCLA is the perfect place to tackle sustainability challenges.
“As one of the leading universities in the world, we see ourselves as having a blue-sky approach,” Sant said. “We see ourselves wanting to develop technologies that might be considered fanciful at one point but become reality very quickly. So we see ourselves looking at a blue sky and saying, well then, let’s come up with ideas which will change the world.”
By: By: phys.org
