A study on the relationship between the ITZ (Interfacial Transition Zone) and steel corrosion in RC structures.

在本研究中，进行了几个系列的实验工作。从这一系列的实验工作中，可以得到以下研究结果：(1)新拌混凝土容易在钢-混凝土界面形成孔洞。(2)钢筋在混凝土中的腐蚀受钢-混凝土界面的影响较大。(3)随着界面空隙的增大，钢的腐蚀明显加重。(4)钢筋在混凝土中的腐蚀起始于钢-混凝土界面空隙处。(5)随着界面空隙的增大，氯化物阈值或腐蚀起始值变小。(6)在混凝土浇筑前在钢表面涂上水泥浆，使钢-混凝土界面的空隙变得很小。

In this study, several series of experimental works were carried out.From these series of experimental works, the following research results can be obtained.(1)By fresh concrete breeding, voids are easily formulated at steel-concrete interface.(2)Steel corrosion in concrete is greatly affected by the steel-concrete interface.(3)As interface voids become larger, steel corrosion clearly becomes heavier.(4)Steel corrosion in concrete initiate at the void of steel-concrete interface.(5)As interface voids become larger, the chloride threshold value or corrosion initiation becomes smaller.(6)By applying the cement paste on steel surface before concrete casting, voids at steel-concrete interface become very small.