INFLUENCE OF FINE ADDITIVES AND SURFACTANTS ON THE STRENGTH AND PERMEABILITY DEGREE OF CONCRETE

Oksana Shkromada,Oksana Yurchenko,Andriy Paliy,Ganna Fedorenko,Anatoliy Paliy,Ivan Vysochin,Alina Pikhtirova,Nadiia Khobot

doi:10.21303/2461-4262.2020.001178

Abstract

The results of studies to determine the effect of titanium dioxide nanoparticles (nanoTiO2), finely dispersed anatase crystalline titanium dioxide (anatazTiO2) and surface-active substances (surfactants) on the compressive strength, degree of permeability and thermal stability of concrete samples are presented. Adding particles of nanotitanium, anatase titanium and surfactants up to 2 % to cement accelerates the hydration process and increases the strength of concrete, and also has a strong effect on its microstructure. As a result of the studies, it is experimentally proved that the compressive strength of concrete increases with the addition of titanium dioxide (nanoTiO2) nanoparticles by 23.2 %, finely dispersed anatase crystalline titanium dioxide (anatazTiO2) by 21.7 % to 5 % concentration by weight. In addition, the introduction of these additives reduces the permeability of concrete. This is due to a decrease in the absorption of concrete by water with the addition of nanotitanium and anatase titanium. The introduction of additives from 1 % to 5 % by weight in concrete reduces the depth of chloride penetration by 10–15 times, compared with the control. The use of temperature-programmed desorption mass spectrometry (TPD-MS) method has shown that an increase in the percentage of TiO2 nanoparticles to 5 % in concrete mixtures correlates with an increase in microporosity and dispersion level of these mixtures, which causes a shift in the peaks of intense gas evolution from the samples when heated to the side low temperatures (for example, carbon dioxide CO2). The resulting concrete samples are planned to be used for the manufacture of floors in livestock buildings. The injected additives are selected because they are not toxic substances and, in contact with the biological environment of livestock buildings (urine, feces), will not react with them

Highlights

IntroductionConcrete coatings are used very often in livestock buildings, for road surfaces
The creation of materials with enhanced physical and mechanical characteristics is due to the improvement and development of the technology for the construction of buildings and structures.Concrete coatings are used very often in livestock buildings, for road surfaces
Research results of the compressive strength and penetration of chloride into concrete Table 2 shows the results of testing the compressive strength of concrete samples on the 7th, 28th and 90th day of hardening

Summary

Introduction

Concrete coatings are used very often in livestock buildings, for road surfaces. They are subject to special requirements for strength and permeability. Among semiconductors with photocatalytic properties based on oxides and sulfites, one can distinguish titanium dioxide (TiO2), zinc oxide (ZnO), tungsten oxide (WO3). Titanium dioxide is taken due to its high photocatalytic activity, chemical stability, and availability. These abilities have only recently been used for concrete and products from it. In addition to photocatalytic activity, its mechanical properties and durability are important. Studies have been conducted of concrete containing TiO2 nanoparticles for paving, which describe the fatigue characteristics of concrete and its susceptibility to stress. The researchers [1] show that the introduction of TiO2 nanoparticles into the concrete mixture increases the degree of abrasion resistance

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