Effects of Admixtures and Water Binder Ratio on The Rheological Properties of The Cementitious Paste
AbstractAn experimental investigation into the rheological behavior of high strength cement paste (HS-CP) has been carried out and presented in this paper. The investigation is aimed at quantifying the impact of Polycarboxylate Ether (PCE) based chemical admixtures in conjunction with two different mineral admixtures on the rheological properties of High Strength Cement Paste (HS-CP). The effect of three varying Water/Binder ratio (0.3, 0.4, and 0.5) on the rheological properties of HS-CP is also observed and analyzed.Rheological properties of HS-CP are measured using Brook-Field Rotational Viscometer DV II+ Pro for an elapsed period of 180 min and at uniform interval of 60 minutes. The instrument, employed in the present study is found to detect systematic changes in rheological properties due to changes in cementitious materials and w/b ratio successfully. Keeping the superplasticizer as PCE common, Fly Ash and Ground Granulated Blast Furnace Slagreplacement, shows a higher rates of yield stress and plastic viscosity as compared to the control paste of 100% OPC. The values of yield stress and viscosity obtained in this experimental study is found to be vary linearly, fitting the Bingham model. Furthermore, it has been also found that, the variation in terms of the w/bratio is inversely varying i.e., as the w/bincreases the yield stress and viscosity decrease.
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