Proposal of Sustainable Recycle System of High Quality Recycled Aggregate with Blast-furnace Slag Cement

高炉矿渣水泥优质再生骨料可持续回收体系的建议

• 批准号: 21760345
• 负责人: HOSODA Akira
• 金额: $ 2.91万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21760345/
• 关键词: コンクリート; 持続可能; 高炉セメント; 再生骨材; リサイクル; ひび割れ

In this research, in order to contribute to sustainable recycle system of high quality recycled aggregate with blast-furnace slag cement, how to improve crack resistance of slag cement concrete was investigated.The main results of this study are as shown below.(1) The effectiveness of the use of lightweight fine aggregate to reduce shrinkage of concrete and to improve crack resistance of slag cement concrete was exhibited.(2) The method to analyze microcrack around aggregate with Acoustic Emission Method was established. AE technique was utilized for very early age concrete under high temperature history. The mechanism of the generation of microcracking was clarified and the properties of microcracking were examined in detail.(3) The method to analyze microcrack of externally restrained concrete with AE was developed. The cracking strength of restrained specimens was much lower than the tensile strength of unrestrained specimens. The reason was investigated with AE analysis.

本研究以高品质矿渣水泥再生骨料为研究对象，探讨了如何提高矿渣水泥混凝土的抗裂性能，以期为矿渣水泥再生骨料的可持续利用做出贡献。(1)结果表明，轻细集料能有效地降低混凝土的收缩，提高矿渣水泥混凝土的抗裂性能。(2)建立了声发射法分析骨料周围微裂纹的方法。利用声发射技术研究了高温历史下早龄期混凝土的声发射特性。阐明了微裂纹产生的机理，并对微裂纹的性质进行了详细的研究。(3)提出了用声发射分析外约束混凝土微裂纹的方法。约束试件的开裂强度远低于无约束试件的抗拉强度。采用AE分析法分析原因。

项目成果

Characterization of Microcracking in Very Early Age Concrete Cumulative AE hits Subjected to Elevated Temperature by AE

极早期混凝土中微裂纹的表征 AE 累积温度受到 AE 影响

• 发表时间: 2010
• 期刊: Proceedings of JCI Vol.32, No.1
• 作者: Ha Ngoc Son;Akira Hosoda;Takeshi Watanabe
• 通讯作者: Takeshi Watanabe

高炉スラグコンクリートのひび割れ抵抗性

高炉矿渣混凝土的抗裂性能

• 发表时间: 2009

高炉スラグタスクフォース成果報告

高炉矿渣工作组结果报告

• 发表时间: 2010

ひび割れ抑制対策と表層品質の向上

抑制裂纹、提高表面质量的措施

• 发表时间: 2010

Detection of Microcracking in Concrete Subjected to Elevated Temperature at Very Early Age by Acoustic Emission

• DOI: 10.3151/jact.8.201
• 发表时间: 2010-06
• 期刊: Journal of Advanced Concrete Technology
• 影响因子: 2
• 作者: Ha Ngoc Son;A. Hosoda