【摘要】 通过对不同标号的水泥在不同水灰比下的交流阻抗随龄期变化的系统研究,探讨了交流阻抗谱、电参数与水泥水化进程的关系.结果表明:水泥水化过程可用不同频率下的阻抗特性表征,该过程的阻抗特性可表示为电阻和电容串并联等效电路,该等效电路的电参数可表征水泥水化特性;在水泥水化过程中,表征孔隙率的串联电阻随时间的增加而逐步增大,表征水化程度的并联电阻则逐渐缩小,与该电阻并联的电容因在水化过程中形成的C-S-H凝胶增多而逐渐增大;通过比较等效电路参数及其变化,可评估水泥的水化程度和水化速率.更多还原

【Abstract】 Impedance technique was applied to evaluate the hydration of cement-based material of different types at different water to cement ratio under different curing time.The relation among the impedance spectra and the electric parameters of the hydration process has been established.It has been shown that the hydration of cemetitious material can be discribed by the equivalent circuit composed of the resistance and capacitance in series and/or in parallel.In the course of hydration,the resistance in series which is related to the porosity of the cement paste will increase with the time,while the resistance in parallel related to the hydration degree decreases gradually.The capacitance in parallel with it will increase due to the increase of C-S-H gel produced in the hydration process.The hydration degree and its rate can be estimated by these parameters.更多还原