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采用液态簧振动力学谱(RMS-L)方法,对水灰比(w/c)为0.8,样品量为70 Hz的水泥净浆的水化过程进行了测量,并与样品量分别为50 Hz和90 Hz的水泥净浆的水化过程进行了对比分析.结果表明:与70 Hz样品量相比,样品量较小(50 Hz)的水泥浆体由于表面张力、浆体内部水泥颗粒的自由运动空间较小,使得诱导期损耗因子Qc-1并没有出现先增大后减小的过程;而样品量较大时(90 Hz),由于在稳定期水分子的缓慢扩散进入,在水泥颗粒表面生成钙矾石,固相体积增加使钙矾石薄膜局部胀裂,水化反应突然加速进行,接着新生成的钙矾石又将破裂处重新封闭,致使水化延缓,导致其共振频率一阶导数(dfc/dt)出现一个先增大后减小的过程.
The hydration process of cement paste with a water-cement ratio (w / c) of 0.8 and a sample volume of 70 Hz was measured by the method of liquid-state vibrational vibration spectroscopy (RMS-L) And hydration process of 90 Hz cement paste.The results show that compared with the 70 Hz sample size, the cement slurry with smaller sample size (50 Hz) The smaller the exercise space, the more the Qc-1 loss factor did not appear to increase and then decrease at the induction stage. However, when the sample size is large (90 Hz), due to the slow diffusion of water molecules during the stationary phase, Surface generated ettringite, the volume increase of the solid phase of the ettringite membrane local cracking, hydration reaction suddenly accelerated, followed by the new generation of ettringite again rupture re-closed, resulting in hydration delay, resulting in a resonance frequency of a Derivative derivative (dfc / dt) appears first increase and then decrease.