pH-VALUE OF REACTION MEDIUM AS A FACTOR OF FOAM STRUCTURE FORMATION

The Far North territories development is carried out in most cases by the rotation-based work, with frequent deployment. Therefore, special conditions are imposed on the shift workers constructions. In particular, high insulating properties, resistance to wind and snow loads, multiple assembly and disassembly possibility, compactness in the traveling condition are presented to them. These requirements correspond to the dome prefabricated constructions. To calculate the thermal-insulating properties of building envelopes, climatic conditions were adopted for the city of Verkhoyansk, as the coldest settlement. The main task for such buildings is to provide the required thermal insolation with the minimum sizes of the building envelope. For this purpose, the prefabricated elements structure of dome-shaped constructions consisting of a timber frame shaped like a triangle 200 mm thick, filled with polyisocyanurate foam, a closed air space on both sides of the prefabricated elements, an OSB inner panel covered with thermal-insulating paint, an outer slab of cement-bonded particleboard, covered with bitumen tile was developed. Moisture protection of thermal-insulating materials is provided from the inside with aluminum foil, and from the external with wind-moisture-proof membrane. In the research process it was found that the thermal resistance of the building envelope without applying thermal insulating paint is R = 6,7 m2 K/W that is not enough for Verkhoyansk conditions. The treatment with liquid thermal-insulating paint increased the thermal resistance to R = 7,94 m2 K/W that exceeds the standard values.

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Formation of thermal-insulating building envelopes of dome constructions for the far north regions

Ovsyannikov

Suska

Shevchenko

2019

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

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Influence of Chrysotile-Asbestos Microreinforcement of Different Mixes on the Properties and Structure of Foams

Egorova

Popov

Zarovnyaev

et al. 2020

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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The paper substantiates the effectiveness and prospects of research in the direction of micro-reinforcement of cellular materials with mineral fibers. Due to the dependence of the quality of foam concrete on the quality of the applied foam, the paper considers micro-reinforcement of foam as a technique that increases its quality indicators. Thus, the influence of chrysotile-asbestos additives in the form of fiber mixtures of various fractional composition on the physical and mechanical properties of foams is considered. Chrysotile-asbestos mixtures are thin fibers and strands that predict their uniform distribution over the matrix of building composites, improving their structural stability and increasing strength characteristics. The article examines the influence of the concentration and fractional composition of chrysotile asbestos on the multiplicity and stability of foams. The features of syneresis and structure of micro-reinforced chrysotile-asbestos foams are also shown. It is shown that the microreinforcement of foam by chrysotile-asbestos fibers increases their structural durability, slowing down the system's syneresis and preventing the deposition of the foam column, but reduces its aeration degree relative to the foaming agent solution. Also, microreinforcement increases the durability of foam in a mortar, characterized by the preservation of foam of the original volume in the composition of the cement mixture. The article substantiates the choice of the most effective mix of chrysotile asbestos and its dosage for increasing the properties of foam.

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Background of Geopolymer-Based Cellular Concrete Production

Kozhukhova

2023

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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Geopolymer systems are currently quite promising among scientists in the field of building materials science in terms of free of cement binders and athermal synthesis materials due to a wide list of their positive properties that compete well with traditional analogs such as cement and cement concrete. The article provides a literary review of the current research and practical experience among Russian and foreign scientists on the issue of the synthesis of cellular concrete based on geopolymer. Based on a review analysis of modern publications in this field over the past 20-25 years, it has been shown that the key parameters that dominate the formation of a high-quality pore structure, as well as the thermophysical and mechanical properties of cellular geopolymer concrete are the following: choice and preparation of the main raw material, taking into account its chemical the nature and microstructure of the system, the type of modifying and pore-forming component, the sequence of introduction of components, the conditions and mode of hardening, the technology of pore formation, etc. As a result of analytical research, it was also revealed that, despite the rather large number of works devoted to obtaining cellular geopolymer systems, in general, today there is no deep understanding of the principles of formation and behavior of the pore structure during the operational period in geopolymer systems.

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pH-VALUE OF REACTION MEDIUM AS A FACTOR OF FOAM STRUCTURE FORMATION

Cited by 6 publications

References 2 publications

Formation of thermal-insulating building envelopes of dome constructions for the far north regions

Formation of thermal-insulating building envelopes of dome constructions for the far north regions

Influence of Chrysotile-Asbestos Microreinforcement of Different Mixes on the Properties and Structure of Foams

Background of Geopolymer-Based Cellular Concrete Production

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