【公開日：2023.08.01】【最終更新日：2024.07.03】
課題データ / Project Data
課題番号 / Project Issue Number
22QS0120
利用課題名 / Title
載荷による加速炭酸化養生した純粋多様なカルシウムシリケート硬化体の反応生成物構造解析及び変形挙動特性解明
利用した実施機関 / Support Institute
量子科学技術研究開発機構 / QST
機関外・機関内の利用 / External or Internal Use
外部利用/External Use
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）マテリアルの高度循環のための技術/Advanced materials recycling technologies（副 / Sub）その他/Others
キーワード / Keywords
Environmentally friendly material design, Nano-structural analysis,X線回折/X-ray diffraction,放射光/Synchrotron radiation
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
Bae Sungchul
所属名 / Affiliation
Department of Architectural Engineering, Hanyang University
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
Kanematsu Manabu,Kim Gyeongryul,Im Sumin,Morooka Satoshi,Cho Seongmin,Shobu Takahisa,Yasue Ayumu,Horiai Kota
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
町田晃彦
利用形態 / Support Type
（主 / Main）共同研究/Joint Research（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
To compare the phase composition, load transferring mechanism, deformation behavior, and structural changes of pure calcium silicate minerals according to the Ca/Si ratio and carbonation period by X-ray diffraction and pair distribution function (PDF) analysis, high energy X-ray scattering experiment was performed on the 5x5x10 mm3 sized paste mixture of C3S, C2S, C3S2, and CS (which corresponds to pure calcium silicate phases with varying chemical compositions (Ca/Si= 3, 2, 1.5, and 1) with the carbonation period of 0, 12, 24, 48, 72, 168 hours.
実験 / Experimental
【利用した装置】：高速2体分布関数計測装置
【実験方法】
Based upon the experiments done earlier by the applicants, the experiments of carbonated calcium silicate pastes were performed in the form of paste mixtures (5×5×10 mm3). First experiments were held by applying external loads during X-ray scattering experiments with the pure calcium silicate phases with varying chemical compositions (Ca/Si= 3, 2, 1.5, and 1, which corresponds to C3S, C2S, C3S2, and CS respectively). The samples were prepared by two types, hydrated and carbonated ones for the comparison of the results. The incident X-ray beam was targeted to the center of the sample in the size of 0.5 mm ×0.5 mm and the flat panel (FP) detector will be positioned at the distance of 304 and 654 mm from the pastes to achieve an extensive PDF Q-range and high angular resolution. External loads of 0.5 to 1MPa were applied each step until the rupture of the sample. The 3-dimensional internal microstructure of the samples weare further investigated by hard X-ray computed tomography at Pohang light source (PAL-7C beamline, X-ray energy: 8.3 keV (Ni K-edge)).
結果と考察 / Results and Discussion
X-ray scattering results of the C3S according to the initial carbonation period are displayed in Fig.1. The scattering peaks of the C3S samples varies significantly by the initial carbonation period. Hydrated C3S contains CSH and CH as a reaction product, whereas the carbonated C3S shows decreased or no amount of CSH according to the Especially, the sample initially carbonated for 12 h (Fig. 1. (c)) shows distinct peaks indicating the presence of Ca(OH)2 as a reaction product. With the increasing carbonation period, diffraction peak intensities of CaCO3 significantly increases (Fig.1. (b)).
PDF analysis results of the C3S according to the initial carbonation period are displayed in Fig.2. The PDF peaks of the C3S samples varies significantly by the initial carbonation period. The peaks located at 1.6, 2.4, 3.6 A is shifted according to the presence of carbonation products. Especially, the sample subjected to 168 h of initial carbonation exhibited the drastic changes compared to the one without carbonation curing.
Atomistic strain calculated by the shifts of PDF peaks according to the constant step loading was shown in Fig. 3. The sample initially carbonated for 12 h had shown drastic strain at initial loading region, whereas the hydrated and 168 h carbonated samples had shown higher elastic modulus. Therefore, it was found that the longer the carbonation period becomes, the higher the elastic modulus became.
図・表・数式 / Figures, Tables and Equations
Fig. 1. X-ray scattering results of C3S by varying initial carbonation period.
Fig. 2. PDF results of C3S by varying initial carbonation period.
Fig. 3. Atomistic deformation behavior of C3S by varying initial carbonation period.
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
Sumin Im, Hyeonseok Jee, Heongwon Suh, Manabu Kanematsu, Satoshi Morooka, Hongbok Choe, Nishio Yuhei, Akihiko Machida, Jihoon Kim, Seungmin Lim, Sungchul Bae, "Insight on the mechanical properties of hierarchical porous calcium-silicate-hydrate pastes according to the Ca/Si molar ratio using in-situ synchrotron X-ray scattering and nanoindentation test", Construction and Building Materials, 365, 130034 (2023), DOI:10.1016/j.conbuildmat.2022.130034
Im Sumin, Bae Sungchul, "Multiscale investigation on the thermal stability of synthetic C-S-H pastes according to Ca/Si ratios", 16th International Congress on the Chemisstry of Cement, ICCC2023 (Bangkok, Thailand）, 令和5年9月19日
Kim Gyeongryul, Suh Heongwon, Cho Seungmin, Bae Sungchul, "Effect of the Formation of MgCl2 based Magnesium Silicate Hydrate on the Physicochemical Characteristics of Calcium Silicate Hydrate", Korea Concrete Institute 2022 Spring Academic Conference (Seoul, Korea), 令和4年5月12日
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
-
Seongmin Cho, Characteristic microstructural phase evolution and the compressive strength development mechanisms of tricalcium silicate pastes under various initial carbonation curing environments, Construction and Building Materials, 409, 133866(2023).
DOI: 10.1016/j.conbuildmat.2023.133866
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
- Im Sumin, Cho Seongmin, Chen Yukun, Bae Sungchul, "Microstructural Analysis of Calcium Silicate Hydrate (C-S-H) Incorporating Graphene Oxide via High Energy X-ray Scattering Measurement", Korea Concrete Institute 2023 Spring Academic Conference (Busan, Korea), 令和5年5月11日
- Cho Seongmin, Suh Heongwon, Kim Gyeongryul, Bae Sungchul, "Comparison of the nanostructure of carbonation products of hydraulic and non-hydraulic calcium silicates using pair distribution function", Architectural Institute of Korea 2023 Spring Conference (Seoul, Korea), 令和5年4月27日
- Cho, Seongmin, Im Sumin, Bae Sungchul, "Nano-structural Investigation of the Reaction Products of Pure Tricalcium Silicate Paste by Carbonation-hydration Curing Condition using Pair Distribution Function", Korea Concrete Institute 2022 Autumn Academic Conference (Jeju, Korea), 令和4年11月3日
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件