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

一、提高耐久性的研究主要结果如下：(1)含气量为8%的混凝土的结垢控制在潮差和飞溅区。(2)使用(1)普通硅酸盐水泥(2)B类硅灰水泥和(3)普通硅灰水泥(15%硅灰)的混凝土构件具有较强的抗结垢能力。(3)较低的水灰比和早强水泥可以控制混凝土的结垢，因为混凝土的冻融初期强度是重要因素。二、混凝土结构在寒冷条件下的使用寿命预测用非线性指数函数和可靠度函数检验混凝土结构的劣化预测。分析了RC模型试件在快速冻融试验和暴露试验中的数据、鄂霍次克海岸线暴露试验中的大试件以及真人试件在拉伸强度试验中的数据。分析结果能够定量地预测达到劣化水平的时间。

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.