Physical and chemical research of the microstructure of the cement composite filled with allumosilicate and glass microphases

Abstract

Using the physical and chemical analysis, the possibility to obtain a dense and crack-resistant Portland cement-based composite material filled with aluminosilicate and glass microspheres and a complex additive which purposefully enhances each of the mentioned properties have investigated. During the molding of a composite material, in which particles of a filler and a binder have the same size in microns, micro-reinforcing fibrous additives will not be effective because their particles are larger than filler’s particles. To specify the conditions for the formation of a micro-reinforcing layer of etryngite needles and for increasing the density of the cement matrix structure, relevant theoretical and experimental studies were carried out and a complex additive consisting of calcium nitrate and chloride, carboxymethylcellulose and plasticizer was proposed. Based on the physical and chemical analysis performed, it has been found that adding a complex additive facilitates the compacting of the cement matrix structure through the additional synthesis of crystalline hydrates: ettringite, calcium hydrochloroaluminate, calcium hydroxychloride, and calcium hydrosilicates of the felt-like structure, which improves physical and mechanical properties of a Portland-based composite material.

Potential of Using Amazon Natural Fibers to Reinforce Cementitious Composites: A Review

“…Sometimes this type of adhesion can be thought of as a tangle of molecules. In this case, the factors that control the resistance at the interface are the distances between each entangled molecule [ 108 ].…”

“…The binding of molecules through interdiffusion is essential for the strength of the composite, as strong bonds between molecules result in a better transfer of tensions from the matrix to the fibers. Thus, it can be seen that the bonds of molecules are closely related to the mechanical properties of the material, such as mechanical performance and type of fracture rupture [ 108 , 109 ].…”