Relation between the Shape of Silica Fume and the Fluidity of Cement Paste at Low Water to Powder Ratio

The effect of the properties of silica fume on the fluidity of ultra high strength cement paste (UHCP) using a polycarboxylate based superplasticizer, silica fume, and low heat Portland cement was investigated. As the dosage of superplasticizer was increased, the flow curve of UHCP changed from Bingham flow to pseudo-plastic flow to Newtonian flow. Also, the effect of silica fume on the fluidity of UHCP was large, in particular the effect on the shape of powder particles smaller than 0.3μm. It is suggested that this is due to the agglomeration structure, the packing state, and the ball bearing effect of the paste due to the shape of the silica fume.

[1]  P. Mitschka.  Simple conversion of Brookfield R.V.T. readings into viscosity functions , 1982 .

[2]  Leslie J. Struble,et al.  Viscosity of Portland cement paste as a function of concentration , 1995 .

[3]  Chiara F. Ferraris,et al.  Measurement of the Rheological Properties of High Performance Concrete: State of the Art Report , 1999, Journal of Research of the National Institute of Standards and Technology.

[4]  Andreas Acrivos,et al.  Measurement of shear-induced self-diffusion in concentrated suspensions of spheres , 1987, Journal of Fluid Mechanics.

[5]  G. Ovarlez,et al.  Macroscopic behavior of bidisperse suspensions of noncolloidal particles in yield stress fluids , 2010, 1006.4215.

[6]  G H Tattersall,et al.  Workability and quality control of concrete , 1991 .

[7]  Xavier Chateau,et al.  Homogenization approach to the behavior of suspensions of noncolloidal particles in yield stress fluids , 2008, 1006.2293.

[9]  Denys Breysse,et al.  Effect of coarse aggregate on the workability of sandcrete , 2002 .

[10]  Lisa Ann Mondy,et al.  An improved constitutive model for concentrated suspensions accounting for shear-induced particle migration rate dependence on particle radius , 2007 .

[11]  N. Otsu.  A threshold selection method from gray level histograms , 1979 .

[12]  Geert De Schutter,et al.  Pipe flow velocity profiles of complex suspensions, like concrete , 2009 .

[13]  Seung Hee Kwon,et al.  A Computational Approach to Estimating a Lubricating Layer in Concrete Pumping , 2011 .

[14]  Shunsuke Sugano,et al.  Study of New RC Structures Using Ultra-High-Strength Fiber-Reinforced Concrete (UFC)-The Challenge of Applying 200MPa UFC to Earthquake Resistant Building Structures:-The Challenge of Applying 200 MPa UFC to Earthquake Resistant Building Structures- , 2007 .

[15]  A. Kwan,et al.  Sphericity, shape factor, and convexity measurement of coarse aggregate for concrete using digital image processing , 2000 .

[16]  Toshio Oshima,et al.  Estimation of the Co-ordination number in a Multi-Component Mixture of Spheres , 1983 .

[17]  Kazuo Yamada,et al.  Molecular Structure and Dispersion-Adsorption Mechanisms of Comb-Type Superplasticizers Used in Japan , 2003 .

[18]  E. J. Hinch,et al.  The effect of Brownian motion on the rheological properties of a suspension of non-spherical particles , 1972, Journal of Fluid Mechanics.

[19]  J. R. Abbott,et al.  A constitutive equation for concentrated suspensions that accounts for shear‐induced particle migration , 1992 .

[20]  Thierry Sedran,et al.  Design of concrete pumping circuit , 2005 .

[21]  F. Larrard.  Concrete Mixture Proportioning: A Scientific Approach , 1999 .

[22]  L. F. Nielsen,et al.  On the Effect of Coarse Aggregate Fraction and Shape on the Rheological Properties of Self-Compacting Concrete , 2002 .

[23]  P. Richard,et al.  Composition of reactive powder concretes , 1995 .

[24]  Hiroshi Mori,et al.  ANALYTICAL STUDY ON EFFECT OF VOLUME FRACTION OF COARSE AGGREGATE ON BINGHAM'S CONSTANTS OF FRESH CONCRETE , 1997 .

[25]  Kejin Wang,et al.  Effect of coarse aggregate characteristics on concrete rheology , 2011 .

[26]  H. Barnes,et al.  An introduction to rheology , 1989 .

[27]  Thomas J. Dougherty,et al.  A Mechanism for Non‐Newtonian Flow in Suspensions of Rigid Spheres , 1959 .

[28]  Kejin Wang,et al.  Modeling rheological behavior of highly flowable mortar using concepts of particle and fluid mechanics , 2008 .

[29]  R. Farris,et al.  Prediction of the Viscosity of Multimodal Suspensions from Unimodal Viscosity Data , 1968 .

[30]  Atsumu Ishida,et al.  New Trends in the Development of Chemical Admixtures in Japan , 2006 .

[31]  Dean-Mo Liu,et al.  Particle packing and rheological property of highly-concentrated ceramic suspensions: φm determination and viscosity prediction , 2000 .

[32]  Nicolas Roussel,et al.  Effect of Coarse Particle Volume Fraction on the Yield Stress and Thixotropy of Cementitious Materials , 2008 .

[33]  A. Kwan,et al.  Particle shape analysis of coarse aggregate using digital image processing , 1999 .

[34]  Tor Arne Hammer,et al.  Flow conditions of fresh mortar and concrete in different pipes , 2009 .

[35]  Mohamed Lachemi,et al.  Performance of new viscosity modifying admixtures in enhancing the rheological properties of cement paste , 2004 .

[36]  Phillip Frank Gower Banfill,et al.  The rheology of fresh concrete , 1983 .