Control of Structure Formation of Reaction Powder Concretes by Triboelectrization

Concretes containing dispersed fillers, reactive rock powders, microsilica and micro-hydrated kaolins are the object of research. The structural topology of such materials is predetermined by the activity of the dispersed filler. The unstable nature of the disperse systems, due to the high free surface energy, was used to increase the adhesion of cement to stone materials. Directional control of structure formation of reactive powder concretes is achieved by triboelectrification providing creation of transition layer on the surface of mineral material which interacts well with both cement and mineral substrate. An experimental research method based on a laboratory apparatus of a vortex layer is presented, which allows to form a triboelectric effect on the surface of fine-grained fillers. To break the aggregating effect of electromagnetic forces at the first stage of preparation of cement mortar for mixing cement with microfillers used energy-saturated high-speed mixers, and at the second stage for mixing cement composition with sand used traditional fillers.