Ifluence of the Grain Composition of the Aggregate on the Properties of Plaster Solutions Based on a Composite Gypsum Binder

A special place among modern materials in Palestine is occupied by finishing materials, the effectiveness of which determines the architectural expressiveness and aesthetics of urban planning, as well as the creation of comfortable living conditions, the rational use of fuel and energy resources, and much more. In the country, traditionally, imported cement-sand plaster is used for interior and exterior decoration of buildings and structures. In this regard, it is relevant to develop competitive finishing materials of a new generation (plaster mortars) based on composite gypsum binders (CGB) with increased water resistance, which meet high requirements for product quality, operational and environmental characteristics, as well as energy costs for their production, and capable of replacing imported analogues. The paper presents the results of determining the granulometric composition of a plaster mortar based on a composite gypsum binder (CGB) with a filler of substandard dune quartz sands and a sand fraction of limestone crushing by computational and experimental modeling according to known equations of ideal curves. It was found that the studied sands do not fit into the schedule with the area of normalized grain composition. In order to obtain the optimal granulometric composition of the aggregate, close to the ideal Fuller curve and providing the most dense packing in the plaster mortar based on CGB, the possibility of its enrichment by mixing two types of quartz sands with the sandy fraction of limestone crushing screenings was considered. For this purpose, using the Granlab program, the optimal granulometric composition of a fine filler from a mixture of 3 different sands of the Palestine deposits was calculated. The combined effect of the dosage, as well as the granulometric composition of the CGB and the optimized mixture of aggregates with a sufficiently dense packing of particles, made it possible to achieve the minimum water demand of plaster mixtures with the required workability and to increase the strength of the hardened solution at 28 days of age by 35%.

S.A. OTHMAN AZMI¹, Postgraduate (This email address is being protected from spambots. You need JavaScript enabled to view it.),
N.V. CHERNYSHEVA¹, Doctor of Sciences (Engineering), Docent, Professor (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.P. DENISOV¹, Candidate of Sciences (Engineering), Head of the Laboratory of the Department of Automobile and Railways (This email address is being protected from spambots. You need JavaScript enabled to view it.);
M.Yu. DREBEZGOVA², Candidate of Sciences (Engineering), Docent (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Belgorod State Technological University named after V.G. Shukhov (46, Kostyukova Street, Belgorod, 308012, Russian Federation)
² Peter the Great St. Petersburg Polytechnic University (29, Polytechnicheskaya Street, St. Petersburg, 195251, Russian Federation)

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