PHYSICAL STUDIES OF LIGHTWEIGHT TAMPONADE COMPOSITE MATERIAL BASED ON MICROSILICA AND LOCAL ORGANOMINERAL INGREDIENTS

Аннотация

The paper presents the results of selecting the composition of composite gypsum materials using inorganic fillers - ash microspheres, which are formed during the combustion of coal at thermal power plants. Based on the laboratory studies, composite compositions have been developed for obtaining thermal insulation building products with low bulk density. The rheological properties and physical and mechanical properties of mortar mixtures have been studied and the optimal compositions of composite gypsum mixtures for the production of thermal insulation materials usingaluminosilicate ash microspheres have been determined. Key words:mineral binders, filler, aluminosilicate microsphere, low bulk density, superplasticizer, compositecomposition,density,thermal insulationmaterials. This project considers the development of a composition of lightweight composite cements aimed at improving the quality of well casing and sealing of their lining. Particular attention is paid to fields with low hydraulic fracturing gradients, where the use of lightweight cement slurries isrequired. The most effective approach to solving these problems is the use of special composite lightweight expanding cement materials. The main objective of this work was to study the role and mechanisms of action of modifying additives (expanding, lightweight, reinforcing and others) in the composition of cement cements, to conduct a set of studies and improve the formulations of lightweight cement materials. To achieve this goal, various fillers and modifying additives were studied that can improve the properties of cement cements, including strength, density and resistance to aggressive environments. One of the key components that determine the properties of cement materials is clinker - the main product of firing the raw mix used in the production of Portland cements. The mineralogical composition of clinker has a significant impact on the rheological and physical- mechanical properties of cement mixtures, which makes its study an important stage in the development oflightweight cementing materials [1]. There is a classification of clinkers by mineralogical composition. If the mass fraction of C₃S exceeds 60%, the clinker is called alite; with a mass fraction of C₂S over 37% - belite; with a C₃A content over 13% - aluminate; and with a mass fraction of C₄AF over 5% - aluminoferrite. 436 INTERNATIONAL JOURNAL OF ARTIFICIAL INTELLIGENCE ISSN:2692-5206,ImpactFactor:12,23 AmericanAcademicpublishers,volume05,issue08,2025 Journal: https://www.academicpublishers.org/journals/index.php/ijai Combined types are also distinguished, such as alite-aluminate or belite-aluminate clinkers. Clinkerswhose compositionis within thespecified limitsare classified as normal. For the production of oil well cements, mainly alitic and normal clinkers are used. However, for special conditions, special compositions can be developed that meet specific requirements[2]. Inert mineral additives are additives of mineral origin, which under normal conditions only slightly chemically interact with the main substance of Portland cement during the hardening process. Limestone and quartz sand are most often used as inert mineral additives. If the hardening conditions deviate significantly from normal, inert additives can become active. Quartz, crushed or intheform ofsand, becomes an activeadditive at temperatures above 60°C [3]. To develop the compositions of composite lightweight oil well cements in this work, Portland cement grade M400, produced by the Navoi Cement Plant, was used as the main binder, and microsilica, a silica-containing technogenic waste from the production of JSC Uzmedkombinat(Bekabad), was used as amicrofiller. Binding construction substances are powdered materials that, when mixed with water, form a plastic, easy-to-process mass that hardens over time into a durable rock-like body. In this paper, the hydraulic binder is Navoi Portland cement grade M400 D0, tested in accordance with the requirements of GOST 10178-85. The chemical and mineralogical composition of Portland cement is presented in Tables 1and 2. Table1-Chemical compositionof Portland cementofthe Navoi Cement Plant Oxidecontent, wt.% SiO А1О FeО СаО MgO SO RO ППП Сумма 2 2 3 2 3 3 2 23,96 4,7 0,79 66,76 2,86 0,57 0,30 - 100,0 Table2-Mineralogical composition ofcement fromNavoi CementPlant Mineral content, mass, % Cement C S C S C A C AF 3 2 3 4 CementM400 D 0 56.51 26,08 11,24 2,40 Table3-Physical andmechanical characteristics of Portland cementofNavoi cementplant 437 INTERNATIONAL JOURNAL OF ARTIFICIAL INTELLIGENCE ISSN:2692-5206,ImpactFactor:12,23 AmericanAcademicpublishers,volume05,issue08,2025 Journal: https://www.academicpublishers.org/journals/index.php/ijai The meaning of the parameters № Name ofparameters ofcement M400 DO 1 Degree ofgrinding: residueonsieve No.008,% 6,4 2 Water/binderratio 0,32 Setting time,hours-minutes 2-25 3 –beginning ofsetting 4-50 –end of setting 4 Compressivestrength, a