Аннотация:The influence of sols, nano-SiO2 and silica fume (separately and together with
AQ1
superplasticizer “Relamiks T2”) on characteristics of the cement–water, and
cement–sand–water systems has been studied. Nanoparticles were isolated from
natural hydrothermal solutions by the two-stage scheme: cryochemical membrane
concentration and vacuum freeze-drying silica sols. SiO2 nanopowder has been
introduced into the cement–water system. The sol SiO2, silica fume and superplasticizer
“Relamiks T2” have been introduced into the cement–sand–water
system. Characteristics of solid samples were measured at different ages (from
3 to 28 days). The effect of nanoadditives on the density, dialling speed and the AQ2
final strength of cement specimens under compression and in flexure has been
established.
Keywords: nanopowder, silica sol, silica fume (microsilica), superplasticizer
cement–sand–water system, mixing water, compressive strength, flexural strength