| Project/Area Number |
23KJ0057
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Multi-year Fund |
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| Section | 国内 |
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| Review Section |
Basic Section 22010:Civil engineering material, execution and construction management-related
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| Research Institution | Hokkaido University |
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Principal Investigator |
Zhai Qi 北海道大学, 工学院, 特別研究員(DC1)
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| Project Period (FY) |
2023-04-25 – 2026-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2025: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2024: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2023: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | molecular dynamics / Adsorption / complex energy / DFT simulation / cement-based materials / blast furnace slag |
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| Outline of Research at the Start |
アルカリ環境下で様々な混和材の反応性や機械的特性について、実験に基づき検討する。分子動力学法（MD）シミュレーションと各種実験により、混和材の反応性を検討し、ライフサイクルアセスメントを含めた新規混和材の総合的な評価システムを構築することである。それに基づいて、機械的特性や耐久性に優れた建設資材としての混和材を提案する。
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| Outline of Annual Research Achievements |
In FY2023, we conducted a systematic review of the role of organic additives in cementitious materials. This review was instrumental in guiding our next research steps. Building upon this review, we combined experiments with theoretical calculations (molecular dynamics simulations and density functional theory) to investigate the mechanism of organic adsorption on surfaces in cementitious materials, yielding new insights. Subsequently, we examined the effects of various organic additives on the hydration of blast furnace slag in a cement environment.
Lastly, we endeavored to model the diffusion of slag at the nanolayer level to predict slag hydration. However, since the experimental phase is still ongoing, we plan to complete both the modeling and experimental validation within this year.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
As outlined in the research plan, our initial focus is on understanding the mechanism of the glass phase in cementitious materials, particularly in high alumina slag-based materials, under various excitation environments. Subsequently, we aim to develop corresponding models.
Currently, we have completed the preliminary exploration of these excitation environments and have made attempts at constructing a model. This model aligns more closely with the findings of previous research. Consequently, the current research is progressing smoothly and is gradually evolving according to the planned trajectory.
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| Strategy for Future Research Activity |
In FY2024, our objectives are to synthesize glass phases with various chemical compositions derived from the chemical compositions of real alternative materials. We will then assess the reactivity and strength of these glass phases using techniques such as XRD and isothermal calorimetry. Concurrently, we plan to develop a predictive model for the reactivity of these glass phases through molecular dynamics simulations, and subsequently compare these results with our experimental findings. Finally, we will conduct a theoretical investigation into the impact of external factors, such as organic additives, on the reactivity of the glassy phase.
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