普通硅酸盐水泥净浆稳定期水化反应的阻抗谱研究

利用交流阻抗谱法测定了不同水灰比普通硅酸盐水泥净浆稳定期水化反应,结果表明：1）水化8天时,不同水灰比样品的阻抗谱为准Randles线型,低频区高水灰比样品的阻抗谱偏离Randles线型小,高频区高水灰比样品的半圆弧直径大,表明水化产物形成的毛细网络未完全形成,造成电荷传递过程很难进行,高水灰比样品的结构变化小,结构相对稳定.2）水化16天时,各样品的阻抗谱为准Randles线型,偏离度相对于第8天时减小,高频半圆弧的直径增大,表明水泥浆体的结构变化减小,结构更加趋于稳定,此时水化反应缓慢地进行.

Impedance Spectra of the Stationary Period of the Hydration Reaction of Ordinary Portland Cement Paste

The Stationary Period of ordinary Portland cement hydration reaction of the different water-cement ratio was measured by Impedance spectroscopy, experimental results show that： 1） The diagonal of the Nyquist curve of the sample with different water-cement ratio deviates from the real axis by 45° in low frequency, which almost is in accordance with Quasi-Randles pattern when the Hydration Reaction of samples lasts for 8 days. The sample with water-cement ratio being 0.5 appears a semicircle in the first quadrant in low frequency, and both of the samples with water-cement ratio being 0.4 and 0.45 appear a semicircle in the fourth quadrant in high frequency. The diameter of the semicircles and the time of initial of deceleration period is larger and earlier with the increase of water-cement ratio respectively; 2） The Nyquist curve of the sample with different water-cement ratio is also in accordance with Quasi-Randles pattern when the Hydration Reaction lasts for 16 days, and the degree of deviating from the real axis is decrease, meanwhile the diameter of the semicircles is larger, which indicates the structure is to start stabilizing and the Hydration Reaction is in progress slowly.