No abstract

The paper reviews the theoretical framework of nano-modification principles of building composites and experimental verification of these principles. The concepts of nano-modification of building composite structures are studied. The paper also suggests the conceptual model of the nano-modification from the point of view of the evolutionary model of a solid-phase formation depending on the kinetics of heterogeneous processes. The technological tools of nano-modification of building composites are substantiated. Cement-based materials are shown as an object of nano-modification. Their hydration kinetics, phase composition, microstructure, and strength characteristics are investigated. The results are analyzed based on the special performance criteria which confirm that the efficiency of cement-based materials technological cycle can be improved by nano-modification.

the efficiency of the use of nanotechnology solutions specially grown nanoparticles to regulate the rheological properties, the kinetics of setting and hardening of the modified cement stone. Modification of the cement stone structure was carried out using the synthesized authors complex nanomodifier (CnA) on the basis of sio 2 nanopar-ticles and superplasticizer GleniUM ® ACe 30 based on polycarboxylate. the originality of the author's approach is the method of synthesis and the method of administration of complex nanomodifier based on sio 2. CnA was prepared in an aqueous medium, which is then used both as a cement mixing water system. it was found that the use of the synthesized CnA reduces the viscosity of the cement paste is 1.5 times, extends the setting time, provides in the first days of hardening strength increase by 4.5 times in comparison with the unmodified system. it is important that the optimum dosage of CnA is only 0.01% by weight of cement. Achieved effects are associated with the manifestation of the role of structure particles embryos substrate for crystallization centers tumors zoning.