文献名： Elucidating how ionic adsorption controls the rheological behavior of quartz and cement-quartz paste

作者 ： Jizhi Huang ^a ， Weiting     Xu ^b ， Huijun Chen ^cd ， Guoyuan Xu ^a

^a School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China

^b School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China

^c School of Environment and Energy, South China University of Technology, Guangzhou 510006, China

^d Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States

摘要： This study revealed how the ionic adsorption adjusts the rheological behavior of quartz and cement-quartz paste. A series of model solutions containing different electrolytes were prepared to evaluate the influence of pH, ionic strength on zeta potential and rheological behavior of quartz. Based on the characteristics of quartz, the rheological mechanism of cement-quartz paste was interpreted. Throughout the work, it is revealed that: (1) the rheological behavior of quartz suspension is dominated by the magnitude of electric double layer (EDL) repulsion, high pH elevates the surface charge of quartz and hence decreases the viscosity of quartz suspension; (2) divalent Ca ²⁺  and Mg ²⁺  significantly reduced the zeta potential of quartz and increased the viscosity by compressing the EDL thickness; (3) the incorporation of quartz as filler decreased the flowability of cement paste due to excessive adsorption of Ca ²⁺  and the flocculation of quartz particles.

关键词： Quartz ； Cement paste ； Rheology ； Zeta potential ； Electric double layer ； DLVO theory