研究水泥基材料性质的时间电流法

Chronoamperometry as Technique for Investigation of Cement-Based Material

水泥基材料的电性质可以表示为一个电阻电容串、并联组成的简单等效电路,可以应用电化学系统的直流瞬态时域方法求其电路参数.在时间电流法测量的基础上,对时间电流法恒电位阶跃线性响应的响应电流ΔI(t)进行数学处理,结合测量数据求出等效电路参数和时间常数,从而可简便判断水泥基材料的细观结构和水化特性.

The specimen of cement-based materials can be regarded as an electrolytic system. The microstructure and the performance of the system can be represented arid described by an equivalent circuit composed of resistance and capacitance in series and/or in parallel. Means of electro-chemical transient technique——chronoamperometry（abbr. CA） is developed into a powerful tool and sensitive window to investigate this kind of electrochemical system. Based on the current response,a mathematical method is used to calculate the parameters and the relaxation time of the equivalent circuit. The knowledge of mechanism of the process in the system and the microstructure can be obtained from the change of the parameters conveniently. In this paper we restrict to the introduction of the technique itself rather than its application in detail.