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Development of technology and the method of use of nanosystems in the production of construction materials, structurally-logic scheme of research

Journal: Bulletin of Prydniprovs'ka State Academy of Civil Engineering and Architecture (Vol.2019, No. 4)

Publication Date:

Authors : ;

Page : 17-23

Keywords : modifying additives; structure; nano dispersive additives; crystals; carbon nanotubes; plasticizer;

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The use of modifying additives is an effective means of purposeful influence on the properties of binders. Introduction (Рroblem statement). It is only possible to have a control effect on the hydration and hardening processes with the correct understanding of their mechanism. Due to directional changes in the structure, in particular adsorption modification, it is possible to achieve a significant improvement in physical, mechanical and operational characteristics. The purpose of the article is to establish differences in the formation of the modified structure of the gypsum matrix in the joint action of micro- and nano dispersive additives in the presence of a plasticizer, as well as their impact on the functional and technological characteristics. Methods. The solution of the problem of optimal modification requires the identification of the relationship between the type, concentration, composition, method of introduction of modifying additives and the resulting functional characteristics of the binder. Results. The results indicate that when ultra - and nano scale particles are added to the gypsum system due to the increased specific surface area of the latter, the concentration of point contacts increases and the kinetics of formation changes. Contact-condensation contacts arise, the formation of which is stimulated by the presence of nano scale particles in the system, while the fixation of the particles passes from the distant coagulation to the near one. That is, depending on the type of additive, it is possible to intensify or, conversely, slow the growth rate of the corresponding crystal faces, which will lead to a change in the shape of the crystal, and accordingly, the physical and chemical characteristics of the solid formed. Conclusion. The study of the effect of additives on the formation of crystals continues, but these results indicate that the speed and shape of the crystals formed varies significantly in the presence of a plasticizer in the solution and ultradispersed particles.

Last modified: 2019-10-17 17:01:43