高贝利特硫铝酸盐水泥水化过程的电化学阻抗谱

利用电化学阻抗谱法研究高贝利特硫铝酸盐水泥水化过程,得到不同水灰比下(0.6、0.8、1.0)的电化学阻抗谱曲线,并提出一种考虑弥散效应和水泥/电极界面扩散过程的等效电路模型,分析水泥水化过程中电化学阻抗参数和分形维数的变化规律.研究表明:不同水灰比下,高贝利特硫铝酸盐水泥的电化学阻抗谱具有相同的变化趋势.在整个水化过程中,随着龄期的增加和水灰比的减小,阻抗参数值和孔体积的分形维数增大,水泥的总孔隙率减小,结构变得密实;孔表面的分形维数则随着龄期的增加和水灰比的减小而减小.

Electrochemical impedance spectroscopy study on hydration process of high belite sulphoaluminate cement

The electrochemical impedance spectroscopy (EIS) was used to study the hydration process of high belite sulphoaluminate cement. The EIS curves of different water cement ratios (0.6,0.8,1.0) were obtained. An equivalent circuit model considering the dispersion effect and the diffusion process of cement / electrode interface was proposed. The variation of electrochemical impedance parameters and fractal dimension in the hydration process of cement was analyzed. The results show that the EIS of high belite sulphoaluminate cement has the same change trend under different water cement ratio. In the whole hydration process, with the increase of age and the decrease of water cement ratio, the impedance parameters RS, rct1 and fractal dimension D increase, the total porosity of cement decreases and the structure becomes dense; the fractal dimension DS decreases with the increase of age and the decrease of water cement ratio.