Dr. Ippei Maruyama is a Professor of Graduate School of Engineering at The University of Tokyo (cross-appointment) and a Professor of Graduate School of Environmental Studies at Nagoya 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 Nagoya University, he was visiting researcher at Delft University of Technology and assistant professor at Hiroshima University. He became a professor in 2016 in Nagoya University, then joined the University of Tokyo as a Professor.

He is a past chair of international committee on irradiated concrete, a Bureau member of RILEM, the editor in chief of Journal of Advanced Concrete Technology, and an associate editor of Materials and Structures. He is leading several national projects relating to aging management of concrete structures in nuclear power plants, Fukushima daiichi decommissioning process, and a long-term use of concrete structures.

His current research topics include architectural engineering, building material engineering, design of concrete structures, aging management of concrete structures, preservation of historical buildings and civil structures, radiation physics and chemistry for concrete, cement chemistry, applied geochemistry (mainly calcite and ferrite concretion phenomena).

Awards:

2025 Japan Concrete Institute Award (Research paper division)2025.6.17
“Meso-scale Modeling of Anomalous Moisture Transport in Concrete Considering Microstructural Change of Cement-based Material”
2025 53th JCA (Japan Cement Association) : The best paper award 2025.05.15
“Microstructural change of hardened cement pastes under Re-humidifcation analyzed by 1H-NMR Relaxometry T1-T2 correlation study.”
2025 WM2024 Superior Paper Award　 2025.04.30
“Experimental and Field Study of Changes over Time in the Contamination Degree of Concrete with Radio-Cesium”
2024 Outstanding paper of the year, Journal of Advanced Concrete Technology 2024.09.10
2024 Japan Concrete Institute Award (Research paper division) 2024.6.18
　　　”Tension Stiffening Affected by Radiation-induced Volume Expansion of Aggregate”
2024 Japan Concrete Institute Award (Research paper division) 2024.6.18
　　　”Thermal Expansion of Cement Paste at Various Relative Humidities after Long-term Drying: Experiments and Modeling”
2023 Papers of Note at the WM2023 Conference　 2023.07.10
“Penetration of Cs and Sr into Cracked Dry Carbonated Mortar Considering the Contamination History of Fukushima Daiichi NPP”
2023 Cement and Concrete Research “Le Chatelier Distinguished Paper Award 2021″ 2023.6.28
”Mechanism of drying-induced change in the physical properties of concrete: A mesoscale simulation study”
2023 51th JCA (Japan Cement Association) : The best paper award 2023.05.18
　　　”Effect of RH on carbonation of hardened cement paste paste particles under general atmospheric CO2 concentration studied by FTIR spectroscopy”
2023 Japan Concrete Institute Award (Research paper division) 2023.06.22
　　　”A New Concept of Calcium Carbonate Concrete using Demolished Concrete and CO2″
2022 Outstanding paper of the year, Journal of Advanced Concrete Technology
2022 Japan Concrete Institute Award (Research paper division) 2022.6.18
　　　”Meso-Scale Modelling of the Mechanical Properties of Concrete Affected by Radiation-Induced Aggregate Expansion”
2021 Outstanding paper of the year, Journal of Advanced Concrete Technology
2020 Journal of Advanced Concrete Technology, The outstanding paper of the year
Hydrogen Production and the Stability of Hardened Cement Paste under Gamma Irradiation
2019 Japan Concrete Institute Award (Research paper division)
Impact of Drying on Structural Performance of Reinforced Concrete Shear Walls
2018 Journal of Advanced Concrete Technology, The outstanding paper of the year
Impact of Drying on Structural Performance of Reinforced Concrete Shear Walls
2018 Japan Concrete Institute Award (Research paper division)
Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation
2017 Journal of Advanced Concrete Technology, The outstanding paper of the year
Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation
2017 Japan Concrete Institute Award (Research paper division)
Action Mechanisms of Shrinkage Reducing Admixture in Hardened Cement Paste
2017 Japan Concrete Institute Award (Research paper division)
A numerical model for concrete strength change under neutron and gamma-ray irradiation
2016 Journal of Advanced Concrete Technology, The outstanding paper of the year
1) A numerical model for concrete strength change under neutron and gamma-ray irradiation
2) Action Mechanisms of Shrinkage Reducing Admixture in Hardened Cement Paste
2016 Japan Concrete Institute Award (Research paper division)
Numerical Approach towards Aging Management of Concrete Structures [Paper 1, Paper 2]
2015 Journal of Advanced Concrete Technology, The outstanding paper of the year
Numerical Approach towards Aging Management of Concrete Structures: Material Strength Evaluation in a Massive Concrete Structure under One-Sided Heating
2013 The Young Scientists’ Prize, The Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology, Japan
Volume change mechanism of cement-based materials.
2012 The Prize of AIJ (Architectual institute of Japan) 2012, Research Theses Division
Water-related reaction, transfer, and volume change in concrete.
2010 JCA (Japan Cement Association) : The best paper award
Deformation of cement paste in early age
(with Mr. A. Teramoto)
2010 JCA (Japan Cement Assocation) : The best presentation award
IR-adsorption of C-S-H under drying process
2010 Best paper in the category of Scientific Value at Sixth International Conference Concrete under Severe Conditions
Quantification of water penetration into concrete through cracks to rebars by neutron radiography.
(with Assoc. Prof. M. Kanematsu, Ms. N. Tsuchiya, Assoc. Prof. T. Noguchi)
2009 JCA (Japan Cement Association) : The best paper award
Visualization and analysis of water behavior around cracking of concrete by Neutron Radiography.
2009 JCI Annual Convention: Paper Encouragement Prize
Evaluation of crack width in massive reinforced concrete structures.
2007 AIJ (Architectural Institute of Japan): Encouragement Prize
Hydration Model of Portland Cement.
2006 ACF: “Best Concrete Technology” Award
Study on the Application of Low-quality Recycled Coarse Aggregate to Concrete Structure by Surface Modification Treatment.
(M.Tsujino, Assoc. Prof. T. Noguchi, M. Tamura, M. Kanematsu, I. Maruyama, H. Nagai)
2006 JCI (Japan Concrete Institute): Award for promising researcher
Modeling of early age concrete based on a hydration model.
2005 Yamada prize, The Maeda Engineering Foundation
Time depenedent property of cement based materials on the basis of micro-mechanics.
2003 JCI Annual Convention: Paper Encouragement Prize