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分析了两种降粘剂的理化性能,对比分析不同掺量的降粘剂对混凝土拌合物流变性、可泵性及稳定性的影响,通过流变参数中的塑性粘度、屈服应力和V漏斗时间及分程度分别表征流变性、可泵性和稳定性。结果表明:复合改性的CR-I降粘剂具有微珠(MBFA)降低浆体粘度的特性且敏感度低,稳定性高且降粘剂适宜应用于高水胶比的混凝土;混凝土拌合物其粘滞阻力随着静停时间的增加而增大;可以采用塑性粘度和V漏斗时间来判断拌合物泵送难易程度,并提出了可泵性区间,即表达方式为:[(0,塑性粘度)∩(0,Vt)]。
The physical and chemical properties of two kinds of viscosity reducer were analyzed. The effects of different dosage of viscosity reducer on the rheological properties, pumpability and stability of the concrete mixture were analyzed. The plastic viscosities, yield stress and V- Time and degree respectively characterize rheology, pumpability and stability. The results show that the composite modified CR-I viscosity reducer has the properties of reducing the viscosity of the slurry with microbeads (MBFA), low sensitivity and high stability, and the viscosity reducer is suitable for high water-cement ratio concrete. Its viscous resistance increases with the increase of static stop time. The plastic viscosity and V funnel time can be used to judge the ease of pumping the mixture, and the pumpability interval is proposed. The expression is: [( 0, plastic viscosity) ∩ (0, Vt)].