煤矸石-水泥体系早期水化的交流阻抗研究

Study on Early Hydration in System of Cement-Coal Stone by Alternating Current Impedance Spectroscopy

采用交流阻抗谱方法对掺加不同量煤矸石的水泥浆体的早期水化过程进行了研究.研究结果表明,孔溶液电阻随着水化龄期的延长而增大,但随着煤矸石掺量的增大而减小;电化学反应电阻随着水化龄期的延长而增大,且可以间接地反映水泥浆体的水化程度;分形维数值随着水化龄期的延长而减小,但随着煤矸石掺量的增大而增大.其可以用来表征硬化水泥浆体的孔隙结构特征.

In this paper,the early hydration processes of cement pastes including various contents of coal stone were studied by alternating current impedance spectroscopy.It was shown that resistance of pore solution(R_s) and resistance of electrochemistry reaction(R_~ct ) increased with the prolongation of hydration ages but R_s decreased with the augment of coal stone.R_~ct can indirectly reflect the hydration degree of cement pastes. Value of fractal dimension (D_s) which can be used to describe the pore structure of hardened cement pastes decreased with the prolongation of hydration but increased with the augment of coal stone.