Influence of Curing Method on Strength Development of Concrete Using Fly Ash

养护方法对粉煤灰混凝土强度发展的影响

• 批准号: 15560484
• 负责人: MASUDA Yoshihiro
• 金额: $ 2.11万
• 依托单位: Utsunomiya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560484/
• 关键词: fly ash; strength development; moist curing; contribution of fly ash to strength; pozzolanic reaction; mix proportioning design; 強度寄与率; ポルトランドセメント量; 水酸化カリウム

With the recent progress of the social environment promoting recycling, it is required that the use for fly ash be increased in building construction. However, there is few data on fly ash concrete accumulated in except those be moist cured at early age. To elucidate the effects of early curing conditions on the mid-and long-term strength development of concrete containing fly ash for reinforced concrete building structures, this study investigated the effects of various moisture conditions during early curing of concrete containing fly ash on its mid-and long-term strength development by experiments, and examined the relationship between the contributions of fly ash to strength, k, and fly ash qualities, concrete mixture proportions, and curing conditions by analyses. The following results are made :(1)The strength contributions of fly ash, k, under various conditions in high-strength and normal-strength concrete were experimented, and the relationships between k and initial curing condition type and curing period were examined. As a result, the influence of curing condition on k was clarified.(2)The past experiment data on strength of fly ash concrete were collected. Based on the organized data, the relationships between k and Blaine specific surface area of fly ash, portiand cement content, content ratio of portland cement and fly ash (C/Fa) and curing condition were examined. The following observations were made : the bigger Blaine specific surface area of fly ash is, the higher k is. k at long-term ages tends to increase as C/Fa increases. k at long-term ages by sealed curing are about 80% times as large as those by standard curing, and k by air curing are about 40-50% times as large as those by standard curing.(3)The strength expression of mortar containing fly ash could be expressed by the summation of the strength of mortar without fly ash and the strength increase due to pozzoknic reaction of fly ash and the powder effect of fly ash.

近年来，随着社会环境促进回收利用的进步，要求在建筑施工中增加粉煤灰的使用。然而，除了早期湿养护的粉煤灰混凝土外，有关粉煤灰混凝土的资料很少。为阐明早期养护条件对钢筋混凝土建筑结构用粉煤灰混凝土中、长期强度发展的影响，通过试验研究了粉煤灰混凝土早期养护过程中不同水分条件对其中、长期强度发展的影响，并考察了粉煤灰对强度的贡献、k值与粉煤灰质量之间的关系。混凝土配合比和养护条件进行了分析。（1）试验了不同条件下粉煤灰对高强混凝土和普通混凝土强度的贡献率k，并研究了k与初始养护条件、养护龄期的关系。结果表明，固化条件对k值的影响是明显的。（2）收集了以往粉煤灰混凝土强度试验资料。在整理数据的基础上，研究了k与粉煤灰Blaine比表面积、硅酸盐水泥掺量、波特兰水泥与粉煤灰掺量比（C/Fa）及养护条件的关系。结果表明：粉煤灰的比表面积越大，k值越高;长期龄期的k值随C/Fa的增加而增加。长期老化时，密封养护的K值约为标准养护的80%，而空气养护的K值约为标准养护的40-50%。（3）掺粉煤灰砂浆的强度表达式可以用不掺粉煤灰砂浆的强度与粉煤灰火山灰反应和粉煤灰粉体效应引起的强度增长之和来表示。

项目成果

高強度コンクリートにおけるフライアッシュの寄与効果

粉煤灰在高强混凝土中的贡献作用

• 发表时间: 2005
• 期刊: 日本建築学会構造系論文集 No.587
• 作者: 呉 富栄;桝田佳寛;中村成春
• 通讯作者: 中村成春

フライアッシュを使用したコンクリートの強度発現に及ぼす養生変化の影響

养护变化对粉煤灰混凝土强度发展的影响

• 发表时间: 2003
• 期刊: 日本コンクリート工学協会,コンクリート工学年次論文集 Vol.25, No.1
• 作者: 呉 富栄;桝田佳寛;中村成春;新沼大史
• 通讯作者: 新沼大史

Strength Efficiency of Fly Ash in High-strength Concrete

高强混凝土中粉煤灰的强度效率

• 发表时间: 2005
• 期刊: Journal of Structural and Construction Engineering(Transactions of Architectural Institute of Japan)(in Japanese) No.587
• 作者: F.-R.Wu;Y.Masuda;S.Nakamura
• 通讯作者: S.Nakamura

Influence of Mixture Proportion and Curing Condition on Contribution of Fly Ash to Strength of Concrete

• DOI: 10.4028/www.scientific.net/kem.302-303.235
• 发表时间: 2005-12
• 期刊: Key Engineering Materials
• 作者: F. Wu;Y. Masuda;S. Nakamura;S. Sato

Influence of Different Curing Conditions on Strength Development of High-Strength Concrete Using Fly Ash

不同养护条件对粉煤灰高强混凝土强度发展的影响

• 发表时间: 2004
• 期刊: ACI, Proceeding of Eighth CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag And Natural Pozzolans in Concrete SP-221
• 作者: Fu Rang Wu;Yoshihiro Masuda;Shigeharu Nakamura
• 通讯作者: Shigeharu Nakamura