Non-autoclave foam concrete is a promising material for low-rise house construction. It has been found that the addition of mineral additives allows to regulate the porous structure of non-autoclave foam concrete, at the same time the coefficient of thermal conductivity is reduced, density is reduced, and frost resistance is improved. The introduction of dispersed wollastonite and diopsid promotes the formation of conditionally closed pores, their volume increases by 47-49%. The introduction of wollastonite reduces the pore volume with a diameter greater than 0.1 μm by 2.34 times, the introduction of diopsid reduces it by 8.2%. It is noted that the addition of the examined additives enables to obtain closed pores with a glossy surface; it improves the performance characteristics of natural hardening foam concrete. According to the results of DTA (Differential Thermal Analysis) and XRFA (X-ray fluorescence analysis), a more complete hydration of cement is recorded, this fact can indicate the structural and modifying influence of additives as crystallization centers for newgrowths.
Recently, there has been an increasing interest to the production of the non-autoclaved aerated concrete. It has a number of advantages in comparison with other materials: low power consumption of manufacturing, high fire resistance, environmental safety, bio persistence, as well as excellent insulation properties. However, its production involves a number of problems: insufficient ultimate strength, high shrinkage, high susceptibility to the parameters of technology, and the quality of raw materials. It is a well known fact that the formation of the foam concrete structure and its main running abilities are affected not only by the mortar part, but also by the chemical nature of the foaming additive, its basic physical and chemical characteristics, as well as by the parameters of foam, produced on its basis.The paper contains an assessment of availability of the technical foam production for manufacturing of the heat-insulated constructional foam at a high-speed cavitation plant involving use of fly ash from the Central heating and power plant. We used the protein and synthetic foaming agents for the work. The authors investigated the influence of process-dependent parameters of a laboratory plant on the technical foam density and foam stability coefficient in the cement paste. The physical and mechanical properties of the non-autoclaved aerated concrete produced with investigated foams are defined. The non-autoclaved aerated concrete samples with physical and mechanical properties allowing its use in production are produced.
The paper is dedicated to investigation on improvement of thermal insulation properties of non-autoclaved concrete by increasing aggregate stability of foamed concrete mixture. The study demonstrates influence of mineral admixtures on the foam stability index in the mortar mixture and on decrease of foamed concrete density and thermal conductivity. The effect of mineral admixtures on thermal conductivity properties of non-autoclaved concrete was assessed through different ways of their addition: to the foam and to the mortar mixture. The admixtures were milled up to the specific surface area of 300 and 600 m2/kg using an AГO-9 centrifugal attrition mill with continuous operation mode (Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk). Laboratory turbulent foam concrete mixer was used to prepare foamed concrete. Thermal conductivity coefficient was defined by a quick method using “ИTП-MГ 4 “Zond” thermal conductivity meter in accordance with the regulatory documents. The impact of modifiers on the foam structure stability was defined using the foam stability index for the mortar mixture. The research demonstrated the increase in stability of porous structure of non-autoclaved concrete when adding wollastonite and diopside. Improvement of thermal and physical properties was demonstrated, the decrease of thermal conductivity coefficient reaches 0.069 W/(m×°C)
Abstract. The paper is dedicated to investigation on improvement of thermal insulation properties of non-autoclaved concrete by increasing aggregate stability of foamed concrete mixture. The study demonstrates influence of mineral admixtures on the foam stability index in the mortar mixture and on decrease of foamed concrete density and thermal conductivity. The effect of mineral admixtures on thermal conductivity properties of non-autoclaved concrete was assessed through different ways of their addition: to the foam and to the mortar mixture. The admixtures were milled up to the specific surface area of 300 and 600 m 2 /kg using an АГО-9 centrifugal attrition mill with continuous operation mode (Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk). Laboratory turbulent foam concrete mixer was used to prepare foamed concrete. Thermal conductivity coefficient was defined by a quick method using "ИТП-МГ 4 "Zond" thermal conductivity meter in accordance with the regulatory documents. The impact of modifiers on the foam structure stability was defined using the foam stability index for the mortar mixture. The research demonstrated the increase in stability of porous structure of non-autoclaved concrete when adding wollastonite and diopside. Improvement of thermal and physical properties was demonstrated, the decrease of thermal conductivity coefficient reaches 0.069 W/(m×°С).
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.