Prof. Ippei MARUYAMA

Topic: CO2 mineralization technologies applied to the concrete industry in Japan

Brief biography:

 Dr. Ippei Maruyama is a professor at the University of Tokyo. He is a visiting professor at the Museum at Nagoya University and at the Research Center for Green X-tech at Tohoku University. He earned his B.Eng. in 1998, M.Eng. in 2000, and Dr.Eng. in 2003 from the University of Tokyo. Before he joined the University of Tokyo, he was an assistant professor at Hiroshima University (2003-2005), associate professor (2005-2016), and professor (2016-2022) at Nagoya University. He won many awards, including the Science and Technology Award for Young Scientists by the Japanese Government and the Le Châtelier Distinguished Paper Award 2021 by Cement and Concrete Research. He is the chair of the International Committee on Irradiated Concrete and the editor-in-chief of the Journal of Advanced Concrete Technology. He leads or contributes to several national projects related to the aging management of concrete structures in nuclear power plants, the Fukushima Daiichi decommissioning process, the development of circular-economy construction materials, the application of mineralization techniques, and the standardization of quantification methods for mineralized CO2 using cementitious materials.

Abstract:

The Japanese cement industry accepts industrial waste and recycles it as raw material and fuel for cement production. This system has been made possible in part by Japan’s abundant supply of limestone with a high calcite content. However, under these circumstances, there are inherent limitations to further reducing the clinker-to-cement ratio.
The Japanese government has therefore promoted research and development aimed at sequestering CO₂ in concrete, and numerous technologies and approaches have been investigated. This lecture will introduce recent examples of technologies that have been commercialized in Japan. It will also discuss methods for quantifying CO₂ sequestration, current developments in their standardization, and the associated environmental value. These issues are essential for incorporating CO₂ sequestration into the carbon economy, including carbon taxation and carbon-credit schemes.