Thermal Insulation Solutions of the Reduced Density

Zagorodnyuk, Liliya; Lesovik, Valeriy; Sumskoy, D.

doi:10.34031/2618-7183-2018-1-1-40-50

Cited by 17 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some studies concerning lightweight concrete filled with cold-bonded fly ash with a low thermal conductivity coefficient were recently carried out at the St. Petersburg Polytechnic University [36,37]. Furthermore, in order to increase the physical and mechanical properties of composites, the development of cement-sand mortars with granular aggregates is being carried out with preliminary mechanical treatment of binding components in grinding units [38][39][40][41].…”

Section: Of 12mentioning

confidence: 99%

Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

et al. 2021

View full text Add to dashboard Cite

It is necessary to solve the ecological problems of regions where there is large-tonnage storage of various finely dispersed materials, including technogenic ones. This article presents the results of an investigation into the possible use of substandard dispersed quartz sands to obtain effective granular aggregates, with the purpose of putting them to use in mortars and concrete. The study used standard and original experimental research methods related to the analysis and preparation of raw materials, technological tests, and the study of the properties of finished composites. Investigations were carried out to obtain composite binders in the component composition of which the use of different ratios of Portland cement and substandard quartz sands prepared in a vortex jet mill was envisaged. It was found that the obtained composite binders had high physical and mechanical characteristics, which was due to the high specific surface area and hydration activity. On the basis of composite binders and finely dispersed quartz sands (fineness from ≤0.16 mm to 1 mm), the granulation of mixtures of 36 types of component compositions was performed. The developed compositions of granular aggregates (GAs) showed the possibility of obtaining them with sufficiently high strength values in cement stone. The studies carried out make it possible to recommend finely dispersed substandard and technogenic materials for the production of GAs, which would ensure the economy of binding materials as well as contribute to the reuse of large-tonnage waste of ferrous and nonferrous metallurgy and the chemical and mining industries.

show abstract

Section: Of 12mentioning

confidence: 99%

Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Subsequently, the condensation of the dissolved dihydrate occurs in the active centers of crystallization, the formation of a crystallization structure and the growth of crystals of the dihydrate. In the case of a non-hydration hardening scheme, the processes of structure formation with a low degree of supersaturation proceed for a long period [25].…”

Section: Introductionmentioning

confidence: 99%

Faience Waste for the Production of Wall Products

et al. 2021

View full text Add to dashboard Cite

Increasing the efficiency of using gypsum binders can be carried out by using not natural gypsum raw materials, but calcium sulfate-containing waste from various industries (phosphogypsum, borogypsum, citrogypsum, etc.). As the main source material in the work, we used gypsum-containing waste from a faience factory in the form of waste molds for casting dishes, souvenirs and plumbing fixtures. It has been established that the optimal binding system is formed by mixing powders of dihydrate technogenic gypsum from a coarse and fine earthenware factory with average particle diameters of 3.473 microns and 3.065 microns in a percentage ratio of 30:70, respectively. Using a computer software developed by the authors, which makes it possible to simulate the microstructure of a raw mixture taking into account the contact interaction of particles and calculate the average coordination number, models of binary packing of particles were constructed at various ratios of their diameters. Studies of the strength of composites obtained on the basis of bidisperse systems have shown the presence of an extremum in the region of mixtures containing 30% coarse powder. With optimal packing, a large number of phase contacts are formed due to the regulation of the grain composition of the bidisperse system. It was revealed that a brick based on the waste of two-water gypsum from earthenware production has 2.5–5 times better characteristics of compressive strength than traditional building wall products based on natural gypsum. At the same time, the strength immediately after molding is more than 3 times higher than that of traditional gypsum products. Even higher indicators are achieved when adding microcalcite in addition to the waste of earthenware production, in this case, the compressive strength is 3–6 times higher, and the strength immediately after molding is almost 3 times higher than that of traditional gypsum products.

show abstract

“…The leading positions of heat-insulating materials made of silicate glasses are due to a highly porous structure that is resistant to physical and mechanical influences [7]. Porous materials from silicate glasses are produced in the form of piece products (blocks, slabs and others) [8] and granules used as a filler for lightweight concrete and heat-insulating backfills [9].…”

Section: Introductionmentioning

confidence: 99%

“…11, x FOR PEER REVIEW 5 of 20[8][9][10][11], pyrite 4-8, calcite 4-7, magnetite 3-4, and quartz 2-4. X-ray phase analysis confirmed the results of petrographic studies.…”

mentioning

confidence: 99%

Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

2021

View full text Add to dashboard Cite

The article is devoted to the development of resource-saving technology of porous granular materials for energy-efficient construction. The relevance of the work for international research is to emphasize expanding the raw material base of porous lightweight concrete aggregates at the expense of technogenic and substandard materials. The work aims to study the processes of porization of glass crystalline granules from polymineral raw materials mixtures. The novelty of the work lies in the establishment of regularities of thermal foaming of glass crystalline granules when using waste of magnetic separation of skarn-magnetite (WMS) ores and lignite clay. Studies of liquid glass mixtures with various mineral fillers revealed the possibility of the formation of a porous structure with the participation of opoka, WMS and lignite clay. This is due to the presence in the materials of substances that exhibit thermal activity with the release of a gas phase. The foaming efficiency of the investigated materials increases when combined with glass breakage. The addition of WMS and lignite clay to the glass mixture increases the pore size in comparison with foam glass. The influence of the composition of raw mixtures on the molding and stability of granules is determined. The addition of sodium carbonate helps to strengthen the raw granules and reduce the softening temperature of the mass. The composition of the molding mixture of glass breakage, liquid glass and a multicomponent additive is developed, which provides an improvement in the molding properties of the glass mass, foaming of granules at a temperature of 750 °C. Foam glass crystalline granules have polymodal porosity, characterized by a density of 330–350 kg/m3, a compressive strength of 3.2–3.7 MPa, and a thermal conductivity of 0.057–0.061 W/(m·°C). Accordingly, the developed granules have a high potential use in structural and heat-insulating concretes.

show abstract

Thermal Insulation Solutions of the Reduced Density

Cited by 17 publications

References 0 publications

Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

Faience Waste for the Production of Wall Products

Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

Contact Info

Product

Resources

About