Activated Fillers for Gypsum and Anhydrite Mixes

Garkavi, M. S.; Artamonov, A.; KOLODEZHNAYA, E.V.; NEFED’EV, A.P.; KHUDOVEKOVA, E.A.; BURYANOV, A.F.; Fisher, Hans-Bertram

doi:10.31659/0585-430x-2018-762-8-14-17

Cited by 5 publications

(5 citation statements)

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“…Having analyzed the impact of the superplasticizers on the strength of the samples, we established the following: the use of Steinberg MP-4 plasticizer in the amount of 2% of the gypsum weight is optimal to ensure high strength, which is 27 MPa. This is due to a decrease in the water demand of the raw mixture and the participation of polycarboxylate in the gypsum stone structure formation (Fedorchuk, 2005;Garkavi et al, 2018). A gradual decrease in strength with a plasticizer concentration of more than 2% in the mixture is due to the impact of the polycarboxylate component on the hardening kinetics and stone structure.…”

Section: Resultsmentioning

confidence: 99%

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Solving Heat Engineering Problems Using the Finite Element Method

Anikanova

Волкова

Kurmangalieva

et al. 2021

AEJ

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Introduction: In the course of the study, we examined energy-efficient and environmentally friendly heat-insulating materials based on gypsum and gypsum-containing primary components. Purpose of the study: We aimed to assess the effectiveness of using gypsum materials in wall structures, by using the finite element method based on the ANSYS Steady State Thermal module. Porous materials of different densities (structural, structural and heat-insulating, and heatinsulating gypsum concrete) were used as wall materials. These materials were obtained as a result of the interaction between residual sulfuric acid adsorbed on the grains of “acidic” fluoroanhydrite and carbonate flour. Methods: The finite element method based on the ANSYS Steady State Thermal module was used. The thermal conductivity of the structures was evaluated in a three-dimensional coordinate system. The experimental values of thermal and physical characteristics were adopted for the walling fragments. Results: The problem was solved numerically, by using the finite element method based on the ANSYS Steady State Thermal module. We established that the developed structural and heat-insulating gypsum concrete is more effective since, under the set design conditions, the temperature of the inner surface of such a wall at the minimum (510 mm) and maximum (770 mm) structure thickness exceeds the temperature of the inner surface of walls made of different materials.

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Section: Resultsmentioning

confidence: 99%

“…This method is not new. Many researchers have been exploring this direction (Belov et al, 2012;Garkavi et al, 2018). However, their approaches to gas formation processes differ.…”

Section: Introductionmentioning

confidence: 99%

Solving Heat Engineering Problems Using the Finite Element Method

Anikanova

Волкова

Kurmangalieva

et al. 2021

AEJ

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“…Many researchers have proposed a method for increasing the water resistance of gypsum by introducing additives that have a common ion with calcium sulfate (for example lime), which reduces its solubility [4][5][6], or blast furnace slags.…”

Section: Introductionmentioning

confidence: 99%

Gypsum polymer materials in construction

et al. 2021

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The modern level of technological development involves the use of traditional materials modified with additives of various types and functional purposes, as well as composite materials allowing to obtain a product with improved properties. Expanding the area of application of products based on gypsum for facade systems involves the creation of weather-resistant, and, first of all, waterproof materials based on gypsum polymers. The purpose of the experiment, the results of which are presented in the article, was to assess the possibility of using polycondensation polymers as a component of gypsum polymer, to model the properties of the material and to evaluate its characteristics as a result of climatic and humidity influences. The modeling and optimization of gypsum polymer properties were based on statistical methods as well as methods of mathematical analysis of functions of several variables. The assessment of the water resistance of gypsum polymer samples was carried out under test conditions in an open reservoir with an almost unlimited reaction capacity of the medium. The weather resistance was checked according to the results of tests in a climatic chamber. Experiments have shown that the strength of samples with 20% modified melamine-formaldehyde resin in compression and in bending for 80 days of storage in air increases by 30% and 25%, respectively. The compressive strength is 60 MPa, and the flexural strength is 12 MPa. Gypsum polymer has high frost resistance up to 150 cycles of alternate freezing and thawing. The result of the research was the confirmation of the possibility of using polycondensation resins and the foundations of the method for selecting the composition of the gypsum polymer were developed. The results obtained can be used in the development of the technology of gypsum polymer products, and, in particular, piece products (building cladding tiles).

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“…For instance, the introduction of sodium sulfide additives leads to the formation of an insoluble calcium sulfide. The last one can serve as a core for the formation of the hierarchical organized structures and promote clogging of pores, strengthening the structure of the anhydrite binder [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of the polymeric additives on the process of calcium sulfatedihydrate crystallization

Ustinova

2020

E3S Web Conf.

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The research is aimed to the clarification of the calcium sulfatedihydrate crystals growth and formation of in the presence of the different polymers based functional additives. The calcium sulfatedihydrate crystals have been synthesized both in the pure form and with the additives. The additives have included a super plasticizer based on a sulfonated melamine-formaldehyde resin (SMF), a methylcellulose (MC) and a redispersible polymer powder based on vinyl acetate, ethylene and vinyl chloride copolymers (VAEVC). The X-ray analysis and the electron microscopy have been applied to identify an influence of the polymer additives over the configuration and size of the calcium sulphate dihydrate crystals. The structural and strength characteristics of the gypsum materials have been also investigated.

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Activated Fillers for Gypsum and Anhydrite Mixes

Cited by 5 publications

References 0 publications

Solving Heat Engineering Problems Using the Finite Element Method

Solving Heat Engineering Problems Using the Finite Element Method

Gypsum polymer materials in construction

Influence of the polymeric additives on the process of calcium sulfatedihydrate crystallization

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