On September 30, a research team led by the University of Tokyo and Shimizu Corporation announced that it is possible to build buildings using calcium carbonate concrete (CCC), which is made from carbon dioxide (CO2) in the atmosphere and calcium carbonate produced from waste. concrete. It was announced that a goal has been achieved. The CCC hard material has the same strength as conventional concrete. We have also developed column members made of CCC hard material. In the future, we aim to obtain certification from the Minister of Land, Infrastructure, Transport and Tourism and apply it to actual buildings. This project will pave the way for the creation of concrete that does not require the use of cement and allows for permanent recycling.
Earthquake resistance assessment test by CCC members (from press release)
This is the result of the New Energy and Industrial Technology Research Organization (NEDO) moonshot research and development project “C4S Research and Development Project” (project manager: Takafumi Noguchi, professor at the University of Tokyo Graduate School). It is being carried out by a research group including the University of Tokyo, Hokkaido University, Tokyo University of Science, Kogakuin University, Utsunomiya University, Taiheiyo Cement, Shimizu Corporation, and Masuo Recycling Co., Ltd. (Arakawa Ward, Tokyo, CEO Mitsuhiko Masuo).
After supplying water in the form of mist to the waste concrete particles at regular intervals, they are repeatedly dried, accelerating the CO2 recovery process from the atmosphere by 50 times compared to conventional methods and achieving carbon negative. We use the CCC hard body production method by pressurizing fine powder materials at low temperatures to increase their density. A CCC cylinder with a diameter of 10 cm has a compressive strength of 38 megapascals.
For use in buildings, we have developed a prestressed combined CCC column member by connecting five layers of rigid CCC covered with thin-walled steel tubes through steel plates. We have conducted earthquake resistance evaluation tests and found that it can be used in buildings after ensuring the overall stiffness. We are also developing CCC wall members. Although it is necessary to consider joints, etc., it is believed that a three- to four-story building can be constructed.
A mock-up of the structure is expected to be on display at the 2025 Japan World Expo (Osaka/Kansai Expo). “We are definitely on track for it to become widespread within the next few years,” Professor Noguchi told a press conference in Tokyo.
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