Effects of Admixtures and Water Binder Ratio on The Rheological Properties of The Cementitious Paste

  • Aishwarya Sabale
  • Sunil D. Bauchkar
  • H.S. Chore
Keywords: Brook-Field RV DVII Pro viscometer, Fly Ash (FA), Ground Granulated Blast Furnace Slag (GGBS),High Strength Cement Paste (HS-CP), Polycarboxylate Ether (PCE), Water/Binder ratio (w/b).

Abstract

An 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.

References

Yahia, A. and Khayat, K.H. (2001), ―Analytical models for estimating yield stress of high-performance pseudoplastic grout‖, Cement Concrete Res., 31(5), pp 731-738.

Wildemuth, C.R.; Williams, M.C., 1984, “Viscosity of suspensions modeled with a shear-dependent maximum packing fraction”, Rheol. Acta., (41) pp 557-566.

Tregger, N.A.; Pakula, M.E.; Shah, S.P. Influence of clays on the rheology of cement pastes. Cem. Concr. Res.
2010, 40, pp 384–391
V. M. Malhotra, Povinder K. Mehta, 1996, “Pozzolanic and Cementitious materials”, Advances in Concrete Technology, (26) pp 283-294.

Ferraris, C.F.; Obla, K.H.; Hill, R. The influence of mineral admixtures on the rheology of cement paste and concrete. Cem. Concr. Res. 2001, 31, pp 245–255.

G. H. Tattersall, P. F. G. Banfill, 1983, “The rheology of fresh concrete”, Pitman Advanced Publishing Program, London, pp 118-133.

Nehdi, M and Rahman,(2004) M-A, “Estimating rheological properties of cementpastes using various rheological models for different test geometry, gap and surface friction”, Cem. Concr. Res., 34, pp 1993-2007.
J. Plank, B. Sachsenhauser, 2009, “Experimental determination of the effective anionic charge density of polycarboxylate superplasticizers in cement pore solution”; Cement and Concrete Research, 37(5) pp 767-775.

Kwon, S.H.; Park, C.K.; Jeong, J.H.; Jo, S.D.; Lee, S.H., 2013, “Prediction of Concrete Pumping: Part I—Development of New Tribometer for Analysis of Lubricating Layer”, ACI Mater. J. 93(2) pp 111-120.

Ahari, R. S., Erdem, T. K., and K. Ramyar, 2015, “Effect of various Supplementary Cementitious materials on the rheological properties of self- consolidating Concrete”, Construction and Building Materials, (8) pp 43-50.

Park, C., M. Noh, and T. Park, 2005, “Rheological properties of cementitious materials containing mineral admixtures”, Cem. Concr. Res., (35) pp 842-849.

G. H. Tattersall, 1991, Workability and Quality-Control of Concrete, London, pp 1244-1256.
Cyr, M., C. Legrand, and M. Mouret, 2000, “Study of the shear thickening effect of superplasticizers on the rheological behavior of cement pastes containing or not mineral additives”, Cem Concr Res 30(9) pp 1477-1483.
American Concrete Institute (2008), “Report on Measurements of Workability and Rheology of Fresh concrete”, Report no. 238. 1 R-08.
Bauchkar S.D and Chore H.S (2014), “Rheological properties of self-consolidating concrete with various mineral admixtures”, Structural Engineering and Mechanics: An International Journal, 51 (1), 1-13.
Brookfield DV II + Pro Viscometer Manual No. M03-165-F0612.
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Published
2018-09-30