Study on strength development and strength management method of high strength concrete in structure

结构中高强混凝土强度发展及强度管理方法研究

• 批准号: 17560496
• 负责人: MASUDA Yoshihiro
• 金额: $ 2.24万
• 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: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560496/
• 关键词: High-strength concrete; Strength development; Low-heat Portland cement; Silica fume; Potential strength; High-temperature history; 低熱ポルトランドセメント

The high-strength concrete which the design strength exceeds 120 MPa is the one of which binders are made of low-heat Portland cement and silica fumes, and water-binder ratio is about 15-25%, is a low water-binder ratio concrete. Generally, the concrete subjected to high-temperature history in early ages shows the early-age strength development is high, but the long-term strength development is stagnant, and it would be outstripped by the concrete subjected to standard curing. However, it was also said that the concrete with a water-binder ratio of 20% or less and subjected to high-temperature history in early ages shows a remarkable early-age strength development, and the long-term strength development would not be outstripped by the concrete which is subjected to standard curing.In this study, we propose to clarify the mechanism of strength development of the low water-binder ratio concrete using silica fumes with which the water-binder ratio is 20% or less, and the design strength is over 120 MPa. Upon investigation, the following results are made:(1) It can be said that the strength of the concrete with 17% or less of water-binder ratio, and heated to 60ーC in early stages of the setting period has exceeded the standard curing concrete strength at 91 days.(2) The mortar from the matrix of the concrete with 17% of water-binder ratio, and heated to 60ーC in early stages of the setting period shows there is nearly the same distribution of micro pores and nearly the same value of combined water and consumed calcium hydrate at 91 days to the one from the concrete which did not subjected to high-temperature history

设计强度超过120 MPa的高强混凝土是以低热波特兰水泥和硅灰为胶凝材料，水胶比为15- 25%的低水胶比混凝土。一般而言，早期经历高温历史的混凝土，早期强度发展较高，但长期强度发展停滞，会被标准养护的混凝土超越。然而，也有人说，水胶比为20%或更低，并在早期经历高温历史的混凝土显示出显著的早期强度发展，并且长期强度发展不会被标准养护的混凝土超过。我们建议阐明使用水胶比为20%或更低的硅灰的低水胶比混凝土的强度发展机理，设计强度达120 MPa以上。研究结果表明：（1）水胶比在17%以下、凝结初期加热至60 ℃的混凝土，其强度可以说超过了标准养护91天的混凝土强度。(2)水胶比为17%的混凝土基质在凝结初期加热至60 ℃的砂浆在91 d时与未经历高温历史的混凝土的砂浆相比，其微孔分布、结合水和氢氧化钙消耗量几乎相同

项目成果

低熱ポルトランドセメントとシリカフュームを併用した高強度コンクリートの強度発現に与えろ初期温度履歴の影響

初始温度历程对低温硅酸盐水泥和硅灰高强混凝土强度发展的影响

• 发表时间: 2006
• 期刊: 日本建築学会構造系論文集 No. 601
• 作者: 河上浩司;西本好克;桝田佳寛
• 通讯作者: 桝田佳寛

高強度コンクリートの圧縮強度発現と微細構造に関する実験研究

高强混凝土抗压强度发展及微观结构试验研究

• 发表时间: 2005
• 期刊: コンクリート工学年次論文集 Vol. 27,No. 1
• 作者: 河上浩司;西本好克;桝田佳寛
• 通讯作者: 桝田佳寛

Experiment Study on Strength Development and Micro-structure of High-Strength Concrete

高强混凝土强度发展及微观结构试验研究

• 发表时间: 2005
• 期刊: Proceedings of the Japan Concrete Institute Vol.27, No.1
• 作者: H.Kawakami;Y.Nishimoto;Y.Masuda
• 通讯作者: Y.Masuda

高強度コンクリートの遠心成形に及ぼす調合の影響に関する研究

配方对高强混凝土离心成型影响的研究

• 发表时间: 2006
• 期刊: 日本建築学会構造系論文集 No.606
• 作者: 菅 一雅;桝田 佳寛
• 通讯作者: 桝田 佳寛

低熱ポルトランドセメントとシリカフュームを併用した高強度コンクリートの強度発現に与える初期温度履歴の影響

初始温度历程对低温硅酸盐水泥和硅灰高强混凝土强度发展的影响

• 发表时间: 2006
• 期刊: 日本建築学会構造系論文集 No.601
• 作者: 河上浩司;西本好克;桝田佳寛
• 通讯作者: 桝田佳寛