Frost Resistance of Marine Concrete in Cold Regions

寒冷地区海工混凝土的抗冻性能

• 批准号: 04650416
• 负责人: AYUTA Koichi
• 金额: $ 1.34万
• 依托单位: Kitami Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650416/
• 关键词: Frost Resistance; Marine Concrete; Exposure Test; Freezing and Thawing; Survey; Reliability Theory; Air Content; Cold Region

1. Scaling Damage Survey of Marine Concrete in HokkaidoEleven concrete structures which were constructed in 1987 were investigated. The main results are as follows. The maximum depth of scaling was 8.6mm, the scaling area became wider with age, and the scaling ratio(the scaling depth multiplied by the scaling area) made rapid progress for the first one or two years after construction.2. Properties of Concrete Exposed to Tidal or Splash Zone for Five or Seven Years.The following were confirmed by the results of exposure test of concrete specimens which were exposed to the Sea of Okhotsk. Marine environment in cold regions has extremely severe conditions for concrete. Concrete which contained silica fume or eight percent air volume show good resistance to scaling.3. Reliability Analysis to Scaling of Concrete Exposed to Splash Zone for 16 Years.Reliability theory for assessing concrete scaling was attempted. The specimens were one cubic meter and were exposed to the Sea of Okhotsk. The following conclusions were drawn. Weible distribution for reliability function conformed to frequency distribution of scaling depth which were not lower than the set-up ratio. The year lapse of fifty percent reliability for scaling at the constant set-up ratio agreed with the measurements.

1.对1987年建成的11个混凝土结构进行了调查。主要结果如下。结垢最大深度为8.6mm，结垢面积随年龄增长而扩大，结垢率（结垢深度乘以结垢面积）在施工后的1 ~ 2年内进展迅速.混凝土暴露于潮汐或飞溅区五年或七年的性能。以下是暴露于鄂霍次克海的混凝土试样暴露试验结果所证实的。寒冷地区的海洋环境对混凝土有着极其苛刻的条件。掺硅灰或8%空气量的混凝土具有良好的抗氧化性能.混凝土在飞溅区16年剥蚀可靠度分析本文尝试用可靠度理论评估混凝土剥蚀。这些标本是一立方米，暴露在鄂霍次克海。得出以下结论。信度函数的威布尔分布符合标度深度的频数分布，且不低于立起比。在定装比条件下，定标的50%可靠度的年变化与测量结果一致。

项目成果

鮎田耕一: "海洋環境下のコンクリートの耐凍害性" 日本コンクリート工学協会自然環境とコンクリート性能に関するシンポジウム論文集. 101-104 (1993)

Koichi Ayuda：“海洋环境中混凝土的抗冻害性”日本混凝土学会自然环境与混凝土性能研讨会论文集101-104（1993）。

鮎田耕一: "寒冷地の海域に5〜6年間暴露したコンクリートの性状" 寒地技術シンポジウム講演論文集. 8. 527-532 (1992)

Koichi Ayuda：“寒冷地区暴露于海水中 5 至 6 年的混凝土的性能”寒冷地区技术研讨会论文集 8. 527-532 (1992)。

木村伸之: "寒冷地海洋環境下におけるコンクリートの劣化防止対策" 土木学会北海道支部論文報告集. 50. 1024-1027 (1994)

Nobuyuki Kimura：“防止寒冷海洋环境中混凝土劣化的措施”日本土木工程师学会北海道分会论文集 50. 1024-1027 (1994)。

Koichi Ayuta: "Properties of Concrete Exposed to Sea Water for 5 or 6 years in Cold Regions" Proc.of Cold Region Technology Conference. Vol.8. 527-532 (1992)

Koichi Ayuta：“寒冷地区暴露于海水中 5 或 6 年的混凝土的性能”，寒冷地区技术会议论文集。

Koichi Ayuta: "Freeze-Thaw Resistance of Concrete in Marine Environment" Proc.of JCI Symnposium on Performance of Concrete under Natural Weathering Conditions. 101-104 (1993)

Koichi Ayuta：“海洋环境中混凝土的冻融抗性”JCI 自然风化条件下混凝土性能研讨会论文集。