Rheology of fresh cement pastes modified with nanoclay-coated cements

Nanoclays (NC) can serve as thixotropy modifiers for fresh concretes, and show potential to meet the rheological demands of 3D concrete printing. Here, we propose a dry dispersion technique that produces NC-coated cement compare conventional methods dispersion. Pastes incorporating NC were tested via shear rheology, scanning electron microscopy, isothermal calorimetry. Dry was found be most effective method, where 4.0 wt% increased static yield stress storage modulus paste by 1500% 550%, respectively, with minimal increase in viscosity 90%. Results small amplitude oscillatory calorimetry indicated enhance fresh-state stiffening through seeding, although rheology results kerosene-based systems is mainly due ionic forces. Finally, discuss how these properties translate high buildability stable layer deposition.