2021 Fiscal Year Final Research Report
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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| 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 |
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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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| Free Research Field |
セメントコンクリート化学
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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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