This work is aimed at studying the rheological properties and processes of structure formation in highly concentrated mineral suspensions modified with a complex organic and mineral additive based on a fluoroglu-cinifurfural oligomer and nanodiamond silicon dioxide particles.
Methods. The distribution of silicon dioxide particles and their modal size in additives were determined by laser light diffraction on the Mastersizer 3000 device and by dynamic light scattering on the Microtrac S3500 device. The rheological properties of the suspensions were determined using a coaxial cylindrical rotary viscometer of the gearless type “Rheotest-2.1”. The setting time and structure formation of the cement dough were evaluated on a Vika device. The plastic strength of the cement dough was determined using a conical Rebinder plastometer. The compressive strength of cement stone was determined using an automatic hydraulic press “PGM-100MG4”.
Conclusions. It has been established that a complex organic and mineral additive reduces the limiting dynamic shear stresses of mineral mixtures, reduces the plastic strength of mixtures in the initial period and shortens the setting time, providing a balance between deceleration and strength development due to the directional formation of consolidated supramolecular calcium silicate structures that structure the cement matrix. It was found that sili-con dioxide nanoparticles, which are part of a complex organic and mineral additive, do not affect the rheological properties of the system in the initial period, unlike Aerosil particles, which increase the limiting dynamic shear stress of the mixture, due to the high particle dispersion.