Research on deterioration of concrete caused by delayed ettringite formation

钙矾石延迟形成引起的混凝土劣化研究

• 批准号: 21560479
• 负责人: HANEHARA Shunsuke
• 金额: $ 3.24万
• 依托单位: Iwate University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21560479/
• 关键词: コンクリート; 耐久性; 膨張劣化; コンクリート製品; エトリンガイト; 膨張

Delayed ettringite formation (DEF) is a phenomenon in which ettringite is generated and accumulates in the concrete after hardening, eventually leading to expansion and destruction of the concrete. In this study, DEF expansion was reproduced in laboratory using a variety of cements, sulfate additions, steam curing conditions and storing conditions. DEF was found to take place only when the three conditions of excessive sulfate, high-temperature steam curing and ample water supply are met simultaneously. The influence of the kind of calcium sulfate (gypsum, hemihydrate or anhydrite CaSO_4) and the heating rate of steam curing was studied. The cases of expansive deterioration of concrete due to delayed ettringite formation (DEF) and the counter measure of DEF in Japan are described in this paper. The influence of kind of cement, aggregate and sulfate and added amount of sulfate on the expansion of concrete by delayed ettringite formation (DEF). The evaluation method of concrete against DEF is also described. As it is reported that both the alkali silica reaction (ASR) and DEF are sometimes observed in the same deteriorated concrete, the relationship between the alkali silica reaction and DEF is also discussed.

延迟的Ettringite形成（DEF）是一种现象，在硬石化后产生Ettringite并在硬化后积聚在混凝土中，最终导致混凝土的膨胀和破坏。在这项研究中，使用多种水泥，硫酸盐添加，蒸汽固化条件和存储条件在实验室中复制了DEF膨胀。只有在同时满足过度硫酸盐，高温蒸汽固化和充足的供水的三种条件时，才发现DEF发生。研究了硫酸钙（石膏，半水合物或硬藻CASO_4）的影响和蒸汽固化的加热速率。本文描述了由于延迟的Ettringite形成（DEF）和DEF的反量度导致混凝土膨胀的膨胀病例。水泥，骨料和硫酸盐以及添加量的硫酸盐对混凝土膨胀的影响（通过延迟的Ettrite形成）（DEF）。还描述了混凝土对DEF的评估方法。据报道，有时在相同的恶化混凝土中观察到碱二氧化硅反应（ASR）和DEF，还讨论了碱二氧化硅反应与DEF之间的关系。

项目成果

硫酸塩の種類及び蒸気養生温度が蒸気養生前後のエトリンガイトの生成に及ぼす影響無機マテリアル学会

硫酸盐类型和蒸汽养护温度对蒸汽养护前后钙矾石形成的影响无机材料学会

• 发表时间: 2011
• 作者: 東剛人;高橋知子;足立修一;本田葉子,羽原俊祐,小山田哲也,加美山雄太,セメント
• 通讯作者: 本田葉子,羽原俊祐,小山田哲也,加美山雄太,セメント

DEFおよびアルカリ骨材反応による劣化組織の観察

观察由于 DEF 和碱性骨料反应导致的结构恶化

• 发表时间: 2010
• 期刊: コンクリート工学年次論文集
• 作者: 羽原俊祐;小山田哲也;福田峻也;本田葉子
• 通讯作者: 本田葉子

THE CASE AND RESEARCH PROGRESS IN JAPAN : rilem Proceeding Pro 85

日本的案例和研究进展：rilem Proceeding Pro 85

• 发表时间: 2012
• 作者: Shunsuke. HANEHARA;Tetsuya OYAMADA and Makoto TANIMURA : DELAYED ETTRINGITE FORMATION
• 通讯作者: Tetsuya OYAMADA and Makoto TANIMURA : DELAYED ETTRINGITE FORMATION

Reproduction of delayed ettringite formation (DEF) in concrete and Relationship between DEF and alkali silica reaction, Fracture Mechanics of Concrete and Concrete Structures (FraMCoS7)

混凝土中延迟钙矾石形成 (DEF) 的再现以及 DEF 与碱硅反应之间的关系，混凝土和混凝土结构的断裂力学 (FraMCoS7)

• 发表时间: 2010
• 作者: 大明準治;足立修一;S. Hanehara and T. Oyamada
• 通讯作者: S. Hanehara and T. Oyamada

DELAYED ETTRINGITE FORMATION : THE CASE AND RESEARCH PROGRESS IN JAPAN :

延迟钙矾石形成：日本的案例和研究进展：

• 发表时间: 2012
• 作者: S.HANEHARA;T.OYAMADA;M.TANIMURA
• 通讯作者: M.TANIMURA