Mechanism of gypsum hardening

Petropavlovskaya, Victoria; Novichenkova, Tatiana; Pustovgar, Andrey; BURYANOV, A.F.; Petropavlovskii, Kirill

doi:10.1051/matecconf/201819604096

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…Compressive strength dependency on the concentration of lime and potassium sulfate was obtained, and the degree of hydration dependency on the concentration of lime and potassium sulfate were established, which corresponds with the data of leading scientists in the field of gypsum materials [9][10][11][12].…”

Section: Methodssupporting

confidence: 52%

Effective binder based on the artificial anhydrite for manufacturing of filling mixtures

GALTSEVA

Bogdanova

2018

MATEC Web Conf.

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Abstract. The article exposes the results of research on the development of filling mixtures based on artificial anhydrite obtained after the interaction of concentrated sulfuric acid and limestone flour. The anhydrite derivation method has a significant impact on its properties and brings more options for the application. The key features of artificial anhydrite are high compressive strength which is more than 50 MPa and extended setting time which is more than 10 hours. In order to use it as a binder in the filling mixtures, it is necessary to modify properties of the anhydrite by integrating the hardening activators. In the relation to the study it was found that the optimal activator providing desirable setting start time (at least 2 hours) and a sufficient set of strength in the first 7 days of hardening is a mixture of 5% portland cement CEM I 42,5 and 1% of potassium sulfate, where 100% is the mass of binder. The additional inclusion of Melment F10 plasticizer in the amount of 0.4 to 1% of the binder ensures the achievement of the such parameters as the 0.3 waterbinder ratio, setting start from 120 to 225 min, final setting time from 180 to 355 min, compressive strength after 24 hours from 6.9 to 13.3 MPa, after 7 days from 24.0 to 33.5 MPa. The microstructure of the binder has been analyzed and the modification options of the artificial anhydrite have been revealed in order to regulate its technical and technological properties., Two compounds of the filling mixture have been developed on the basis of the obtained binder, technical properties of compounds satisfy the maximum requirements for filling materials for depleted underground spaces. Research results have shown an opportunity and a prospectively of integrating the modified artificial anhydrite in structures of filling mixtures.

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Section: Methodssupporting

confidence: 52%

Effective binder based on the artificial anhydrite for manufacturing of filling mixtures

GALTSEVA

Bogdanova

2018

MATEC Web Conf.

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“…Расчет оптимального гранулометрического состава КГВ с плотной упаковкой тонкодисперсных частиц определяли с помощью уравнения «оптимальной» кривой Функа-Дингера (2), которое, по мнению авторов [8][9][10][11][12], наиболее точно описывает реальную тонкодисперсную систему с учетом наличия мелких фракций и различной формы зерен. С учетом коэффициента формы частиц, уравнение имеет вид:…”

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Influence of Granulometric Composition of the Composite Gypsum Binder on Its Properties

Othman

Чернышева

Drebezgova

et al. 2023

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

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The primary task of technologists-designers is to optimize the structure and properties of building composite materials. Its achievement allows simultaneously increasing their efficiency, reliability and durability. The article presents the results of determining the granulometric composition of a composite gypsum binder (CGB) by computational and experimental modeling using the known equations of "ideal" curves. Due to the fact that when designing the binder composition, one of the main tasks is to optimize its structure at the micro level with finding the best ratios sizes and quantitative content of particles in the hardening system to create a dense packing, in the work a comparison is made of the granulometric compositions of 3, 4 and 5-component KGV. It has been established that the developed 5-component composition of KGV, including (% by weight): 68 % gypsum binder (G5B-II - 70% and GVVS-16 – 30 %), 10 % Portland cement, 20% fine quartz sand, 0.5 % metakaolin VMK-45 and 1.5% limestone dust, in terms of the ratio of components and their granulometric composition, deviates from that calculated using a computer program using the equations of the "optimal" Funk-Dinger curve by 15.3 %, which causes a denser packing of its particles with an increase in average density, strength indicators and softening coefficient even with a decrease in the content of gypsum binder

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Modeling of the high-strength clinker-free binder structure

et al. 2019

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Modern approaches in materials science should provide a solution to the problems of energy and resource conservation. They are also called upon to develop a line of directed synthesis of composites that possess the required parameters over the entire spectrum of properties. In order to obtain a high-strength structure of a clinker-free binder, the possibility of obtaining it on the basis of natural gypsum stone is considered. As is known, the strength of crystallization structures by adhesion in contact and the number of contacts is determined. To optimize the internal structure of a high-strength clinker-free binder, to obtain the maximum number of contacts and increase their strength, the possibilities of geometric topological approaches were used. When solving such problems, the geometric parameters and organization levels of the structures of disperse systems allow topology to be described. The fundamental possibility of obtaining a high-strength composite structure through the prism of the formation of a dispersed system with a maximum number of phase contacts between crystals of calcium sulfate dihydrate is considered. The granulometric composition of gypsum stone must meet the requirements (principles) of hardening, physical-chemical model and type of structure. Therefore, in the work, the possibility of obtaining high binder strength by optimizing it in accordance with the model was studied. mixtures of two powders with different average particle sizes were used. This increases efficiency and improves the properties of the binder.

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Mechanism of gypsum hardening

Cited by 6 publications

References 5 publications

Effective binder based on the artificial anhydrite for manufacturing of filling mixtures

Effective binder based on the artificial anhydrite for manufacturing of filling mixtures

Influence of Granulometric Composition of the Composite Gypsum Binder on Its Properties

Modeling of the high-strength clinker-free binder structure

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