While working at a design studio in New York City after grad school in the early 2000s, architect Ginger Krieg Dosier started staying up late at night to read the book Biomimicry, which explores how biology can inspire design. As she thought about the fundamental sustainability challenges of the materials she worked with, she jotted herself a note: What if you could grow cement?
Cement, the glue that holds together concrete, has a massive carbon footprint that makes up around 8% of global emissions, four times more than the airline industry. In fact, the world now produces more than 4 billion tons of cement each year, and making it takes a lot of energy: The key step involves using fossil fuels to heat up limestone to 2,732 degrees. Burning limestone also releases CO2 directly.
In Biomimicry, Krieg Dosier read about examples of materials made by nature. “It really just resonated with me,” she says. “The scientists were looking at mussels and barnacles that were able to make adhesive stronger than anything we can make. And they were trying to figure out, how is this possible?”
She started reading more about biomineralization, the process that forms coral reefs and shells, and learned how microorganisms play a role in building calcium carbonate, the same material that makes up limestone. A few months later, she and her husband started to experiment with using microbes to grow bricks in a makeshift lab in an extra bedroom in their apartment. After thousands of iterations, they had a formula they liked.With funding from the U.S. Department of Defense, the company has also designed “living marine cement” for use in seawalls or other underwater applications. If the concrete develops a crack, it can pull calcium and carbon from the water to heal itself.
“It didn’t make sense to disrupt everything in the entire concrete value chain,” Krieg Dosier says. “From day one, even before Biomason was named, it was very important for us to develop a technology that was easy to use, especially with existing concrete producers.”
The demand keeps growing as architects, cities, and companies look for ways to shrink emissions. “Cement has come under scrutiny and investigation, trying to figure out what we can do,” Krieg Dosier says. “I actually think that there’s a big shift right now. There’s a scramble to figure out, How are we going to solve this problem?”
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