Improving Durability and Prediction of Service life of Concrete Structure in Cold Sea Environment.

提高冷海环境下混凝土结构的耐久性和使用寿命预测。

• 批准号: 06650491
• 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: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650491/
• 关键词: Marine concrete; Frost resistance; Scaling; Service year; Reliability analysis; Air-content; Blended cement; Freeze-thaw

I.Study on improving durabilityThe main results are as follows :(1) Scaling of concrete with air-content 8% was controlled in tidal range and splash zone.(2) Concrete units used with (1) Ordinary Portland Cement (2) B types of Portland fly ash cement and (3) Ordinary Portland cement added with 15% silica fume have greater scaling resistance.(3) The case of lower water cement ratio and early strength cement can controll scaling of concrete because the strength of concrete in the beginning of freeze-thaw is important factor.II.Prediction of Service life of concrete structure in cold sea environmentThe purpose of this study is to examine deterioration prediction of concrete structure by non-liner exponential function and reliability function. The data of RC model specimens during rapid freeze-thaw tests and exposure tests, large specimens during exposure tests at Okhotsk shoreline, and mortal specimens during tensile strength test were analyzed. The analysis results are able to predict the reaching time to a level of deterioration quantitatively.

主要研究结果如下：（1）含气量为8%的混凝土在潮差区和飞溅区均能较好地控制起裂。(2)采用（1）普通波特兰水泥（2）B类波特兰粉煤灰水泥（3）普通波特兰水泥加15%硅灰的混凝土构件具有更好的抗结垢性。(3)混凝土冻融初期的强度是影响混凝土强度的重要因素，因此，在低水灰比和早强水泥的情况下，可以控制混凝土的结垢。二、寒冷海洋环境下混凝土结构使用寿命的预测本研究的目的是通过非线性指数函数和可靠度函数来检验混凝土结构的劣化预测。分析了混凝土模型试件快速冻融试验和暴露试验、鄂霍次克沿岸暴露试验大型试件以及抗拉强度试验中的混凝土死亡试件的试验数据。分析结果能够定量地预测到达恶化程度的时间。

项目成果

Koichi AYUTA et.al: "Scaling of Concrete Exposed to the Ice Covered Sea" PROCEEDINGS OF '94 COLD REGION TECHNOLOGY CONFERENCE. Vol.10. 341-347 (1994)

Koichi AYUTA 等人：“暴露在冰覆盖的海洋中的混凝土的结垢”94 年寒冷地区技术会议论文集。

鮎田耕一: "寒冷地における暴露試験による干満帯コンクリートのスケーリング防止対策の検討" 寒地技術論文・報告集. 11. 64-68 (1995)

Koichi Ayuda：“通过寒冷地区暴露试验防止潮汐带混凝土结垢的措施研究”，寒冷地区技术论文和报告，11. 64-68 (1995)。

鮎田耕一: "寒冷地海洋環境下のコンクリートの経年劣化評価" 寒地技術論文報告集. 10. 341-347 (1994)

Koichi Ayuda：“寒冷海洋环境中混凝土老化劣化的评估”寒冷地区技术论文报告。10. 341-347 (1994)。

H. SAKURAI: "Experimental Study on the Deteriofation Prediction of Concrete Structure by Reliability Theory" 北見工業大学研究報告. 27第2号. 53-64 (1996)

H. SAKURAI：“通过可靠性理论进行混凝土结构劣化预测的实验研究”北见工业大学研究报告 27 No. 2. 53-64 (1996)

Koichi AYUTA et.al: "SCALING RESISTANCE OF CONCRETE EXPOSED SEA ENVIRONMENT" PROCEEDINGS OF CEMENT AND CONCRETE. Vol.49. 662-667 (1995)

Koichi AYUTA 等人：“混凝土暴露海洋环境的抗垢性”水泥和混凝土论文集。