Study on the effect of limestone powder with different fineness on the rheological properties of cement paste
In order to study the effect of granite limestone powder and S95 slag powder on the rheological properties of ce-ment paste.The rheological properties of cement-limestone powder paste and cement-limestone powder-slag powder composite paste were measured by R/S rheometer,the wet packing density of cement-limestone powder-slag powder composite paste was measured by minimum water demand method,and the Zeta potential of cement-limestone powder paste was measured by Zeta potentiometer.The results show that with the increase of limestone powder content and the decrease of particle size(specific surface area),the shear stress and apparent viscosity of slurry decrease,and the effect of limestone powder fineness on the rheological properties of slur-ry is greater than that of limestone powder content.Limestone powder and slag powder with finer particle size improve the wet pack-ing density of slurry.The addition of limestone powder can reduce the Zeta potential of the paste,but the addition of a small amount of slag powder can increase the Zeta potential of the paste to some extent and improve the flocculation phenomenon in the paste.
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