Plasmochemical Modification of Wall Building Materials

Abstract

the aim of the work is to study the effect of a high-temperature plasma torch on the processes of phase transformations and layer-by-layer modification of the protective and decorative coating on concrete using as a filler a mixture of quartz sand and hollow glass microspheres. The main tasks included: investigation of the processes of evaporation and thermal diffusion of oxides of plasma-coated coatings; study of phase transformations in the melt and its subsequent crystallization in the process of rapid spontaneous cooling of the fused protective and decorative coating; study of the effect of sodium liquid glass on the processes of polymorphic transformations of alumina and the formation of micro-wicks due to the intense diffusion of sodium oxide; study of operational characteristics of protective and decorative coatings. It was established that the initial phases in the protective-decorative coating are α-Al2O3 and CaO∙6Al2O3 (β-Al2O3), and the liquid sodium glass in the coating leads additionally to the formation of Na2O∙11Al2O3. The top layer of the protective and decorative coating is Na–Ca–Al–Si glass with regions of heterogeneities containing an increased content of sodium oxide. The content of aluminum oxide in the protective and decorative coating based on the battle of high-alumina refractory was 95.1 %. The introduction into the coating composition of sodium liquid glass minimizes the processes of dehydration of the binding component and changes the chemical composition of the protective and decorative coating. Reduction of the aluminum oxide content to 83.0 % affects the microhardness indicators. Microhardness of the concrete surface due to the introduction of liquid glass is reduced from 2510 HV to 887 HV.

Plasma Technologies in Construction Industry

“…Protective-Decorative Coatings for Silicate Materials. Previous research has demonstrated that when plasma flow contacts with the surface of silicate building materials, the formation of a layered structure occurs [16][17][18]. Another authors [19,20] presented the results of calculations for the temperature field distribution over the section of a treated product.…”

Glass Micro Balls Based on Glass Domestic Waste for Road Construction

“…Traditional technologies for obtaining GMB are energy-intensive and time-consuming. The use of plasma technologies allows intensifying the process and reducing energy consumption [9]. Highperformance plasma furnaces have been developed to produce silicate melts [10,11].…”

Heating Rate and Liquid Glass Content Influence on Cement Brick Dehydration

“…Plasma-chemical modification is one of the promising technologies of creating protective-decorative coatings in the manufacture of finishing construction materials for building and construction faces (Bondarenko et al 2018a, b;Bessmertny et al 2018;Bondarenko et al 2016;Volokitin et al 2016). Dehydration, melt formation and accumulation during plasma melting take second fractions, and the surface is heated up to 2000°C.…”