Researchers from the University of Tokyo develop a new building material made of recycled concrete and carbon dioxide

Researchers from the University of Tokyo’s Department of Architecture have developed a promising new kind of concrete that has the potential to reduce emissions from the construction industry.  Approximately 7% of the world’s carbon dioxide emissions come from the manufacture and use of cement, which is the main component of concrete. In addition, a large proportion of these emissions is due to the necessary use of calcium, which is primarily obtained by burning limestone. Professor Ippei Maruyama and Calcium Carbonate Circulation System for Construction (C4S) project manager Professor Takafumi Noguchi investigated a less carbon-intensive method of capturing calcium. They subsequently found a way to take concrete waste and captured carbon dioxide and combine them in a process to create a usable form of concrete called calcium carbonate concrete. As noted in the research team’s report, Japan is estimated to have accumulated around 100 billion tons of concrete, with the annual amount ...