Constructional and Thermal Insulation Material Based on High-Strength Anhydrite Binder

Begunova

Drochytka

et al. 2021

SSP

The paper presents the results of studies of the structure and properties of a fluorohydrite binder modified by a chrysotile nanotubes dispersion in a medium of calcium nitrate solution. It is shown that addition of this modifier into the anhydrite composition leads to a 106-fold decrease in electrical resistance. Microstructural analysis of the fluorohydrite composition showed changes in the morphology of new formations with the creation of crystalline hydrates of increased density. The presence of elongated nanocrystals on the surface of the hardened matrix was noted. In addition, IR spectrum absorption lines, prove the presence of calcium nitrate in the pore space of the composition, which contributes to a significant decrease in the electrical resistance of the developed composite.

Section: Methodsmentioning

confidence: 99%

The Influence of Activated Dispersed Additives on Electrical Conductivity of Anhydrite Compositions

Begunova

Drochytka

et al. 2021

SSP

“…Dispersion analysis (Yakovlev et al, 2019a) showed that the average particle size of the expanded perlite sand is 65 μm, up to 72% of the particles of the expanded sand have sizes up to 100 μm. The average particle diameter is 10.5 μm.…”

Section: Methodsmentioning

confidence: 99%

“…The aim of this study was to increase the physico-mechanical characteristics of fluoroanhydrite compositions to expand their field of use. In the course of the work, the effect of a plasticizer based on an aqueous solution of polycarboxylate esters on the properties of high-strength and lightweight expanded pearlite sand compositions based on technogenic anhydrite (Yakovlev et al, 2019a), namely, fluoroanhydrite, a waste product of hydrofluoric acid, was studied.…”

Section: Introductionmentioning

confidence: 99%

Fluoroanhydrite Compositions Plasticized by Polycarboxylate Esters

Kalabina

Engineering Structures and Technologies

Dufek

et al. 2020

The influence of a plasticizer based on polycarboxylate esters on the properties of a high-strength fluoroanhydrite composition and a lightweight composition with expanded perlite sand is investigated. It was shown that the addition of 2% polycarboxylate esters on water base to compositions has increased compressive strength and a flexural strength up to 46% and 20% respectively compare to composite without any additives. Due to the structure's compaction of the compositions, water absorption decreased and the water resistance of the material increased. Microstructural analysis of the compositions confirmed the improvement of physical and mechanical characteristics by changing the morphology of crystallohydrate formations, increasing the contact area between new formations and modifying the structure by carbon nanotubes. The developed mixtures are supposed to be apply for self-leveling fluid mixtures for floors with reduced thermal conductivity.

Efficient heat-insulating material based on technogenic anhydrite

IOP Conf. Ser.: Mater. Sci. Eng.

Kalabina

Pervushin

et al. 2019

Physical and mechanical properties of the heat-insulating composition based on high-strength anhydrite binder with expanded perlite sand as a lightweight aggregate have been studied. The study has evaluated the influence of two poring components, air-entraining additives and aluminum powder suspension, on the main characteristics of the composition: the compressive strength of the sample, its average density, thermal conductivity, and water absorption. The studies have shown that adding an air-entraining agent in an amount of 1.2% by the weight of dry fluoroanhydrite significantly influenced the decrease in the average density (up to 37%) of the material. The developed composition with a lightweight aggregate based on expanded perlite sand and an air-entraining additive can be used in construction as an efficient heat-insulating material, including for filling cavity walls during frame construction.