Abstract
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.
Highlights
In the context of actively growing volumes of new construction and reconstruction of existing facilities, there is a high demand for dry building mixes, among which flooring levelers and self-leveling compositions are in demand
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
Summary
In the context of actively growing volumes of new construction and reconstruction of existing facilities, there is a high demand for dry building mixes, among which flooring levelers and self-leveling compositions are in demand. The mixture characteristics are the following: density 610 kg/cubic meter, thermal conductivity 0.11 W/m°C, water resistance 0.87, compressive strength 1.5 MPa (after 2 days). A high-strength flooring (suggested as a top layer over a heat-insulating one) based on gypsum binder, quartz sand, and additives of the following characteristics has been developed: density 2100 kg/cubic meter, thermal conductivity 0.72 W/m°C, water resistance 0.98, and compressive strength 25 MPa (after 6 days). 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. The use of industrial waste is known to be one of the primary tasks of building materials science; the development of fluoroanhydrite-based compositions seems relevant from the point of view of reducing the cost of products and environmental load in places of waste accumulation (Fedorchuk, 2013)
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