采用宏电池腐蚀方法研究了在不同湿度条件下氧气扩散对高含氯混凝土中钢筋腐蚀速率的影响,得到在不同条件下钢筋腐蚀反应的控制因素.只要混凝土中毛细孔不是处于完全饱水状态,宏电池腐蚀反应即为混凝土电阻所控制.当试样长期处于饱水状态时,腐蚀反应速率为氧扩散所控制.在混凝土内部饱水程度变化时,控制因素的非稳态变化过程的长短由腐蚀宏电流的大小以及混凝土内部毛细孔中原有氧气总含量所决定.

The results got by gavalnostatic pulse method (GPM) in time domain were compared with those got by electrochemical impedance spectroscopy (EIS) in frequency domain, which is used frequently to determine the corrosion status in electrochemical research, in order to develop a fast measuring method of corrosion status of rebar in reinforced concrete. Their relationship was discussed theoretically. A formula was deduced based on Fourier transformation to establish the conversion of the result of GPM from time domain into frequency domain. It is found that the information got by GPM in t/(RC) =0￣5 is nearly equivalent to the information got by EIS in low frequency region. The calculating error is smaller than 4%. This is why GPM method can get enough information in a much shorter time than EIS method does.

采用电流阶跃法研究了钢筋混凝土这样的复杂体系中的钢筋的锈蚀状态.发展了一种新的数据处理方法,可将混凝土保护层的欧姆电阻和浓差扩散极化阻抗的影响扣除,提高测量结果的准确度.研究证明,电流阶跃法特别适用于确定已脱钝的钢筋的锈蚀速率.

研究了水泥 粉煤灰复合胶凝材料在低水胶比条件下的水化产物与硬化浆体显微结构，探讨了高效减水剂对复合胶凝材料的水化产物、水化程度、硬化浆体显微结构的影响．水泥 粉煤灰复合胶凝材料的水化产物与普通硅酸盐水泥相同．球形的粉煤灰微粒在浆体中起到微集料的作用，在低水胶比条件下，有助于改善新拌浆体的流动性与硬化浆体的断裂性能，提高其强度．掺有ＦＤＮ的复合胶凝材料其初期水化程度并不因表观水胶比低而降低．水泥 粉煤灰复合胶凝材料与高效减水剂协同作用，在低水胶比条件下能获得较好的力学性能．