Abstract
The preliminary results of the studied cement samples were obtained by the nanoindentation method. It was revealed that the elastic modulus M increases in samples that contain a complex additive containing nanosized particles. The effect is also observed with the introduction of an additive containing only one type of nanoparticles (nanosilica sol SiO2 or carbon nanomaterial MCNT). The selection of the parameters of the nanoindentation method, which ensured the obtaining of the final consistent results, was performed. These results are presented by histograms of the distribution of nanoindentation points in modulus of elasticity M and hardness H and distributions in M and H in the horizontal XY plane perpendicular to the motion of the nanoindentor. The results obtained indicate that there is a change in the nanostructure of the C – S – H gel, which is compared with an increase in strength, Young’s moduli and shear, upon the introduction of SiO2 nanoparticles and MCNT nanoparticles.
Highlights
The preliminary results of the studied cement samples were obtained by the nanoindentation method
The nanoindentation method has become an alternative approach to studying the mechanical properties of materials at the nanoscale
The nanoindentation method makes it possible to assess the effect of nanoparticles directly on the volume fraction of different forms of CSH gel at an early age of 6, 12, 15, 24 h and at an adult age of 4-6 months [2,3,4,5,6,7]
Summary
The preliminary results of the studied cement samples were obtained by the nanoindentation method. The selection of the parameters of the nanoindentation method, which ensured the obtaining of the final consistent results, was performed These results are presented by histograms of the distribution of nanoindentation points in modulus of elasticity M and hardness H and distributions in M and H in the horizontal XY plane perpendicular to the motion of the nanoindentor. The nanoindentation method has become an alternative approach to studying the mechanical properties of materials at the nanoscale. In this case, it is not the sample size that decreases, but the size of the deformed region. The aim of the work was to determine the effect of hydrothermal SiO2 nanoparticles with a high density of surface silanol groups Si-OH and MCNT nanoparticles with an acid-activated surface on the CSH gel nanostructure, separately and in combination, on the CSH gel nanostructure
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