摘要
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 of cement paste with water-cement ratio（w/c） of 0.8 and sample quantity of 70 Hz wasdetected by Reed-vibration Mechanical Spectroscopy for Liquids（RMS-L）, and analyzed contrastively with the hy-dration of the cement pastes with quantities of 50 Hz and 90 Hz. The results show that compared to the sample witha quantity of 70 Hz, the loss factor Qc-1of the sample with less quantity（50 Hz） did not experience a process of firstincreasing and then decreasing during the induction period of hydration. The reason is there is less space for thefree motion of the cement granules because of the surface tension. While the resonance frequency＇s first derivationof the sample with more quantity（90 Hz） revealed a process of first increasing and then decreasing during the stableperiod of hydration. This is because the water spread into the cement granules gradually, and form more ettringite onthe surface of the granules by reaction. For that matter, the ettringite films burst as the increasing volume of solid.As a result, the hydration is accelerated and produces new ettringite to seal the film. So the hydration slows down ac-cordingly at last.
出处
《伊犁师范学院学报（自然科学版）》
2016年第1期24-29,共6页
Journal of Yili Normal University：Natural Science Edition
基金
伊犁师范学院2015年度研究生科研创新项目(2015YSY027)
关键词
水泥
样品量
水化反应
液态簧振动力学谱
cement
sample quantity
hydration
reed-vibration mechanical spectroscopy for liquids
