摘要
本文从理论上对爱因斯坦的粘度方程进行了修正,使之适用于“水-水泥”系统,修正以后的粘度方程为η_r=1+[kk_1C_v]^(K_2) ,将该方程进行数学处理并结合实验曲线求出方程中的常数 k、k_1和 k_2。根据常数的物理意义首次推算出水泥表面吸附水层近似厚度。进而讨论了吸附水和自由水对“水-水泥”体系中流变性能的影响,并结合Polanyi 势能理论研究了减水剂的作用机理,指出减水作用的原因之一是水泥表面吸附水量的减少,从而增加了体系的自由水量。
Abstrsct
Einsteins viscosity equation was extended to apply to the system of“water-cement”.For
such system thed viscosity equation is η_r=1+[kk_1 C_v]^(k^2) ,where k,k_1 and k_2 are constants.
with the help of mathematics,this equation combined with the experimental curves was
treated in order to get the constants.According to the physical meanings of the constants,
the thickness of adsorbed water was calculated approximately for the first time.
Furthermore,the paper discussed the effects of adsorbed water and first water on the
rheology in the system of“water-cement”and analysed the mechanisms of water reducing
admixture in which Polanyis potential energy theory was involved.It reached that one of the
water-reducing effects is perhaps owed to the increase of free water in the system of“water
-cement”as result of reduction of adsorbed water.
关键词
水泥
粘度
表面吸附
吸附水
势能
Viscosity
Absorbed water
Free water
Potential energy
Particle
