THE RHEOLOGICAL PROPERTIES IN DISPERSED SYSTEM OF CEMENT (Rep. No.1) : On the Viscosity of Cement Paste and Mortar
- 1 January 1978
- journal article
- Published by Architectural Institute of Japan in Transactions of the Architectural Institute of Japan
- Vol. 269, 19-30
- https://doi.org/10.3130/aijsaxx.269.0_19
Abstract
The rheological properties in dispersed system (i.e. slipping shear stress, Viscosity and shear yeild stress) were examined by two kinds of rotation viscometer. These properties depend on the volumetric concentration and the specific surface area of dispersed solid. The result of the theoretical examination about the size shapely effect of dispersoid having influence upon viscosity are as follows. 1. When the revolution is 62.5rpm, the rotation viscometer shows the most stabilized value. 2. Shapely effect of dispersoid can be obtaind by the ratio of measured value to theoretical value in specific surface area. 3. Fresh cement mortar has a yield stress and it is non-Bingham body which is shown as a non-linear relation between stress and strain rate. 4. The viscosity η_m is ten times as large as the shear yeild stress τ_y. 5. The viscosity in dispersed system of cement can be shown as a function of volumetric concentration and specific surface area of dispersoid. the relation equation is as follows. p_η_=η_/ηW=(4.7×10^<-5>・B_c+1)^<φc> _mη_=η_m/η_=(1.015×10^<-5>・log B_+1.053)^<φs> Where. _pη_=η_/ηW : Relative Viscosity of Cement Paste _mη_=η_m/η_ : Relative Viscosity of Mortar η_W (poise) : Viscosity of water (or dyne・sec/cm^2) η_ (poise) : Viscosity of cement paste (or dyne・sec/cm^2) η_m (poise) : Viscosity of mortar (or dyne・sec/cm^2) B_c (cm^2/gr) : specific surface area of cement (measured value) B_ (cm^2/gr) : specific surface area of fine aggregate (caluculated value) φ_c (%) : Volumetric concentration of cement contained in cement paste φ_s (%) : Volumetric concentration of fine aggregate contained in mortarKeywords
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