Abstract
Improving the properties of cement building materials is possible with the use of modifiers, including nanoscale ones. Such nanomodifiers include hydrosilicates of zinc and copper. The increase in the performance characteristics of nanomodified cement composites is due to changes in the chemical composition of the resulting cement stone, in particular, an increase in the content of hydrosilicate structures. The chemical composition of the cement stone was studied by FTIR-spectroscopy. Colloidal solutions of zinc and copper hydrosilicates with known characteristics were used for the nanomodification of cement stone. It is shown that when using copper hydrosilicates synthesized at high concentrations of iron hydroxide, the concentration of amorphous silica does not significantly affect the composition of cement stone. However, with a decrease in the concentration of iron hydroxide, with an increase in the concentration of amorphous silica, the content of hydrosilicate structures increases. The use of nanoscale zinc hydrosilicates is more efficient than copper hydrosilicates. Their use makes it possible to increase the content of structures containing silicon-oxygen tetrahedra, submicrocrystalline calcium hydrosilicates of a tobermorite-like structure in cement stone, and the formation of ettringite is also noted. Thus, it was found that the use of zinc hydrosilicates as nanomodifiers for cement stone allows increasing the content of hydrosilicate structures in hydration products.
Highlights
The most common method of regulating the mechanical and operational properties of building materials is the use of modifying additives [1-11]
Colloidal solutions of copper and zinc hydrosilicates have been used for nanomodification of cement stone
The chemical compositions of colloidal solutions are presented in table 1
Summary
The most common method of regulating the mechanical and operational properties of building materials is the use of modifying additives [1-11]. One of the reasons for the change in properties is the change in the chemical composition of the resulting composite. For cement composites, this is realized by binding portlandite to form various hydrosilicates [12-16]. To obtain a modified cement stone, it is advisable to use colloidal solutions of metal hydrosilicates [17-20]. Such modifiers include nanoscale zinc and copper hydrosilicates that differ in cation type, concentration, and silicate modulus.
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