ADVANCED CONCRETE TECHNOLOGIE MODIFIED BY COMPLEX ADDITION BASED ON SILICA-FUME AND NANO-TUBES

Abstract

The paper proposes the use of a mutually reinforcing combination of nanoparticles with a transition to the region of low doses (1000-10000 times lower than traditional ones), which makes it possible to apply a relatively low consumption of polycarboxylate superplasticizer simultaneously to reduce the water demand of the concrete mixture and stabilize the nanoparticles; multilayer carbon nanotubes (MCNTs) of domestic production with a specific surface area of ​​60 m² / g, a variable length / diameter ratio l / d (in the range of 0.01-20 μm / 10-300 nm), a high density of carboxyl groups of the activated surface and hydrothermal silica nanoparticles SiO₂ with an average nanoparticle diameter of 5.5 nm, specific surface area of ​​500 m² / g, density of surface silanol groups up to 4.9 nm^-2 in the form of a stable sol with a high modulus of electrokinetic potential, eliminating the need for dispersion and stabilization when preparing a complex aqueous suspension.