Abstract:
This study focuses on the investigation of the influence of CO2 concentration on the carbonation process in cementitious paste using ordinary Portlandite cement and limestone-calcined clay cement (LC3), specifically on the water content distribution. Employing single-sided nuclear magnetic resonance spectroscopy for water profiling, we revealed that the water content of fine pores (interlayer space and gel pores) was consistent at the carbonation front under accelerated carbonation processes, demonstrating the plugging effect where fine pore water governs the carbonation progress. This effect was absent under natural carbonation conditions because of the carbonation process was slower than drying.
Short bio:
Dr. Ippei Maruyama is a professor at The University of Tokyo. He is a visiting professor of the Museum at Nagoya University and of 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 is a vice chair of the International Committee on Irradiated Concrete, the editor-in-chief of the Journal of Advanced Concrete Technology, and an associate editor of Materials and Structures. He is leading several national projects relating to the aging management of concrete structures in nuclear power plants, the Fukushima Daiichi decommissioning process, calcium carbonate circulation system for construction, and the standardization of quantification methods for mineralized CO2 using cementitious materials.
His current research topics include atomic-scale studies of the colloidal nature of C-S-H, design of concrete structures, wood materials, radiation physics and chemistry for concrete, multi-scale modeling of concrete and concrete structures, and application of calcite concretion.
