耐久 100 年以上的高性能混凝土

High Performance Concrete with Durability over 100 years

以一种新型超细粉取代混凝土中部分水泥，配制水胶比为０２８的高性能混凝土。若以海水为环境，其极限氯离子含量以钢筋表面氯离子浓度／混凝土界面碱度≥０６，并假定钢筋保护层厚度为５ｃｍ，试验测定了混凝土氯离子扩散系数，经计算，这种高性能混凝土中钢筋脱钝时间为１２０年；而对比的基准混凝土仅为２０年。

The high performance concrete with water binder ratio (W/B) 0.28 have been prepared by using a new type of ultra-fine powder instead of partial cement in concrete,and the Cl-diffusion coefficient have been measured by author's method. In environment of sea,if the cover of reinforcement is in 5cm.and the limit Cl-content,represented with ratio of Cl concentration at the surface of steel bar to the alkalinity of interfacial concrete,is equal to or more than 0.6(/≥0.6),after calculation,the time for passive film being break down is over 120 years,However,to the normal concrete for comparison is only 20 years.