Material design of recycled cement composedof highly reactive B-C2S, achieving significant CO2 reduction
| Project/Area Number |
19H02211
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 22010:Civil engineering material, execution and construction management-related
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| Research Institution | Niigata University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
佐伯 竜彦 新潟大学, 自然科学系, 教授 (90215575)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥13,520,000 (Direct Cost: ¥10,400,000、Indirect Cost: ¥3,120,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
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| Keywords | 再生可能セメント / 高Ca/Si比 / C-A-S-H / 高活性Ca2SiO4、 / 結晶子径 / 錯体重合法 / 27Al MAS NMR、 / 29Si MAS NMR / 再生セメント / トバモライト / 低圧水蒸気吸着 / 等量微分吸着熱 / 赤外吸収スペクトル / 高Ca/Si 比C-S-H / 高活性β-C2S / 水蒸気吸着等温線 / 吸着熱 / Ca/Si 比 / C-S-H / 比表面積 / β-C2S / Far-FT-IR / Ca/Si比 / FT-IR / 高Ca/Si比C-S-H / CO2削減 |
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| Outline of Research at the Start |
本研究は，発生CO2，焼成エネルギーおよび天然資源を同時かつ大幅に削減することが可能な「高活性β-C2Sを主原料とした再生可能なセメント(再生セメント)」の材料設計思想を提案し，その実現性を検証するものである．具体的には，①β-C2Sと同じC/S比であるC/S比=2.0の非晶質C-S-Hを合成すること，②合成したC/S比=2.0の非晶質C-S-Hを焼成し，高活性β-C2Sを得ること，③得られた高活性β-C2Sの水和反応機構を解明し，水和後にはCHが共存せず，かつ①で合成したものと同様のC/S比=2.0の非晶質C-S-Hのみが生成する「再生セメント」設計の確立を行うことを目的としている．
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| Outline of Final Research Achievements |
This paper investigates the Al substitution properties in C-S-H with a Ca/Si ratio of 2.0 obtained by hydrating highly reactive belite, and the regeneration of belite by re-calcinating. The results show that Al was incorporated bridging site in C-S-H with a Ca/Si ratio of 2.0 as 4- and 6-coordinated Al and that the basal spacing increased with an increase in the amount of substitution. On the other hand, belite was regenerated from C-A-S-H with a high Ca/Si ratio by calcinating at 800 degrees C. The crystallite diameter and specific surface area of the regenerated belite were similar to those of the pre-hydrated belite, indicating that the formation of α’-C2S was predominant over β-C2S with increasing Al substitution. These results indicate that recyclable cement may sustain the regeneration cycle even if its key element, C-S-H with a Ca/Si ratio of 2.0, is altered by Al.
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| Academic Significance and Societal Importance of the Research Achievements |
骨材等に含まれるAlが、本再生セメントシステムに取り込まれた場合でも、再生セメントサイクルを維持できることが示されたことは、実用的価値が示されたものといえる。
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Report
(4 results)
Research Products
(19 results)
