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Takahiro Ohkubo

Chiba University

1-33, Yayoi-cho

Inage-ku

Chiba-shi, Chiba, 263-8, 271-8510

Japan

SCHOLARLY PAPERS

13

DOWNLOADS

464

TOTAL CITATIONS

2

Scholarly Papers (13)

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1.

Microstructural Analysis of Cement Paste Blended with Blast Furnace Slag Using 1h Nmr Relaxometry

Number of pages: 68 Posted: 09 Sep 2022
Shiju Joseph, Marcello Mutti, Takahiro Ohkubo, Ippei Maruyama and Ozlem Cizer
University of Glasgow, KU Leuven, Chiba University, Nagoya University and KU Leuven
Downloads 101 (684,672)

Abstract:

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Proton NMR, Hydration, GGBFS, pore structure, Calcium Silicate Hydrate

2.

Proposal of a new pretreatment of accelerated carbonation for evaluating material potential

Downloads 45 (1,121,190)

Proposal of a new pretreatment of accelerated carbonation for evaluating material potential

Number of pages: 52 Posted: 19 Nov 2025
Luge Cheng, Ryo Kurihara, ZHENLI YANG, Takahiro Ohkubo, Ryoma Kitagaki, Atsushi Teramoto, Yuya Suda and Ippei Maruyama
affiliation not provided to SSRN, University of Tokyo, affiliation not provided to SSRN, Chiba University, Hokkaido University, Hiroshima University, Niigata University and Nagoya University
Downloads 39 (1,224,220)

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Carbonation (C), Pretreatment, Water content, Supplementary cementitious materials (SCM)

Proposal of a new pretreatment of accelerated carbonation for evaluating material potential

Number of pages: 53 Posted: 20 Jan 2026
Luge Cheng, RYO KURIHARA, Zhenli Yang, Takahiro Ohkubo, Ryoma Kitagaki, Atsushi Teramoto, Yuya Suda and Ippei Maruyama
affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Chiba University, Hokkaido University, Hiroshima University, Niigata University and Nagoya University
Downloads 6 (1,635,165)

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Carbonation (C), Pretreatment, Water content, Supplementary cementitious materials (SCM)

3.

Mechanisms of Change in Accelerated Carbonation Progress in Cement Paste Under Different Relative Humidity Conditions

Number of pages: 46 Posted: 05 Dec 2024
Luge Cheng, Ryo Kurihara, Takahiro Ohkubo, Ryoma Kitagaki, Atsushi Teramoto, Yuya Suda and Ippei Maruyama
affiliation not provided to SSRN, University of Tokyo, Chiba University, Hokkaido University, Hiroshima University, Niigata University and Nagoya University
Downloads 45 (1,121,190)

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Carbonation (C), Microstructure, Relative humidity, Calcium-Silicate-Hydrate (C-S-H)

4.

Mechanistic Insights into Accelerated Carbonation Fronts in Cement Pastes with Varying Ca/Si Ratios: The Roles of Water Transport and Microstructural Evolution

Number of pages: 53 Posted: 23 Jun 2025
Luge Cheng, Ryo Kurihara, Zhenli Yang, Takahiro Ohkubo, Ryoma Kitagaki, Atsushi Teramoto, Yuya Suda and Ippei Maruyama
affiliation not provided to SSRN, University of Tokyo, affiliation not provided to SSRN, Chiba University, Hokkaido University, Hiroshima University, Niigata University and Nagoya University
Downloads 39 (1,209,354)

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Carbonation (C), Water content, Calcium (alumino) silicate hydrate (C-(A)-S-H), Supplementary cementitious materials (SCM)

5.

Aqueous Dissolution Rate of Nuclear Waste Glasses as a Function of Environmental Parameters

Number of pages: 7 Posted: 23 Aug 2024
Yaohiro Inagaki, Tatsumi Arima, Ryuta Matsubara and Takahiro Ohkubo
affiliation not provided to SSRN, Kyushu University, affiliation not provided to SSRN and Chiba University
Downloads 35 (1,249,711)

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nuclear waste glass, aqueous dissolution rate, environmental parameters, aqueous Si concentration, solution pH

6.

Mechanistic insights into carbonation shrinkage of hardened cement paste via RH-dependent pathways of decalcification and decomposition of C-A-S-H

Number of pages: 61 Posted: 19 Nov 2025
Yuya Suda, Takahiro Ohkubo, Atsushi Teramoto, Ryoma Kitagaki, Ryo Kurihara and Ippei Maruyama
Niigata University, Chiba University, Hiroshima University, Hokkaido University, University of Tokyo and Nagoya University
Downloads 34 (1,277,121)

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carbonation shrinkage, decalcification, decomposition, Ca-modified silica gel, C-A-S-H

7.

Plugging Effect of Fine Pore Water in Opc and Lc3 Paste During Accelerated Carbonation Monitored Via Single-Sided Nuclear Magnetic Resonance Spectroscopy

Number of pages: 50 Posted: 24 Jun 2024
Luge Cheng, Ryo Kurihara, Takahiro Ohkubo, Ryoma Kitagaki, Yuya Suda, Atsushi Teramoto and Ippei Maruyama
affiliation not provided to SSRN, University of Tokyo, Chiba University, Hokkaido University, Niigata University, Hiroshima University and Nagoya University
Downloads 33 (1,277,121)
Citation 1

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Acceleration (A), Carbonation (C), Calcium-Silicate-Hydrate (C-S-H) (B), Pore Size Distribution(B)

8.

Relationship between Ion Irradiation-Induced Amorphization And Volume Expansion in Quartz and Feldspars for Concrete Aggregates

Number of pages: 14 Posted: 23 Jan 2024
Kenta Murakami, Nhut Vu Luu, Hamza Samouh, Takahiro Ohkubo, S. Kano, Masami Nishikawa, Kiyoteru Suzuki and Ippei Maruyama
University of Tokyo - The University of Tokyo, Nagaoka University of Technology, Nagoya University, Chiba University, University of Tokyo - Nuclear Professional School, Nagaoka University of Technology, affiliation not provided to SSRN and Nagoya University
Downloads 29 (1,345,526)

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Concrete aggregates, Ion irradiation, radiation induced volume expansion, amorphization, long term operation of nuclear power plants

9.

Neutron Flux Impact on Rate of Expansion of Quartz

Number of pages: 45 Posted: 24 Sep 2024
Ippei Maruyama, Kenta Murakami, Takahiro Ohkubo, Shohei Sawada, Osamu Kontani, Takafumi Igari, MASAKI KAWAI and Junji Eto
Nagoya University, University of Tokyo - The University of Tokyo, Chiba University, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and affiliation not provided to SSRN
Downloads 28 (1,345,526)

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Keywords: neutron flux, quartz, radiation-induced expansion, relaxation, healing

10.

Evaluation of Radiation-Induced Amorphization of Α-Quartz in Concrete Aggregates Using Raman Spectroscopy

Number of pages: 33 Posted: 12 Jul 2024
Amr Meawad, Kenta Murakami, Takahiro Ohkubo, Osamu Kontani, Junji Eto, Minh Do Thi, Claudia Aparicio, Chinthaka M. Silva and Ippei Maruyama
Capital University, University of Tokyo - The University of Tokyo, Chiba University, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, Government of the United States of America - Pacific Northwest National Laboratory and Nagoya University
Downloads 28 (1,345,526)

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Raman spectroscopy, X‐ray diffraction, neutron irradiation, meta-chert, sandstone, metamictization

11.

Integrated Modeling of Short-Term Glass Dissolution:  Combining Experimental and Computational Approaches for Accurate Predictions

Number of pages: 11 Posted: 24 Jun 2024
Ryuki Kayano, Ryuki Shimoyama, Ryuta Matsubara, Yaohiro Inagaki, Keisuke Ishida and Takahiro Ohkubo
Chiba University, Chiba University, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and Chiba University
Downloads 24 (1,399,036)

Abstract:

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Glass dissolutionSolid-state NMRMolecular dynamicsLinear regression

12.

Semi-Dry Natural Carbonation at Different Relative Humidities: Degree of Carbonation and Reaction Kinetics of Calcium Hydrates in Cement Paste

Number of pages: 50 Posted: 16 Sep 2024
Naohiko Saeki, Ryo Kurihara, Takahiro Ohkubo, Atsushi Teramoto, Yuya Suda, Ryoma Kitagaki and Ippei Maruyama
affiliation not provided to SSRN, University of Tokyo, Chiba University, Hiroshima University, Niigata University, Hokkaido University and Nagoya University
Downloads 23 (1,411,822)
Citation 1

Abstract:

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Degree of carbonation, kinetics, Phase assemblage, Relative humidity

13.

Full-Scale Observation of Drying-Induced Microstructure Change in Hardened Cement Paste by Water and 2-Propanol 1h-Nmr Relaxometry

Posted: 15 Jul 2024
Ryusei Igami, Go Igarashi, Abudushalamu Aili, Ryo Kurihara, Takahiro Ohkubo and Ippei Maruyama
Nagoya University, Nagoya University, Nagoya University, University of Tokyo, Chiba University and Nagoya University

Abstract:

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Calcium-Silicate-Hydrate (C-S-H) (B), Microstructure (B), Pore size distribution (B), Drying (A), Solvent replacement