Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Structure and properties of magnesia stone obtained by activation of caustic dolomite
Introduction. The solution of the actual problem of deficit of reserves of raw materials with high MgO content by involving low-magnesian raw materials from dolomitized limestone into production is presented. For this purpose, it was proposed to increase the activity of the binder using preliminary mechanical activation in the vortex layer device. The aim of the study is to determine the effect of mechanical activation of caustic dolomite with plasticizers in the vortex layer device on the composition, structure and properties of magnesia stone.Materials and methods. Mechanical activation of the caustic dolomite was performed using a vortex layer device and the surface analysis of obtained specimens was carried out using a laser analyzer. X-ray analysis was used to determine the phase composition of the obtained specimens.Results. Regularities of hardening, phase composition of magnesia binders from duration of dispersion of caustic dolomite powder and concentration of plasticizing additives were investigated for the first time. A dense and strong matrix with high physical and mechanical properties is obtained. The effect of plasticizing additives based on lignosulfonate, polyester polycarboxylate and naphthalene sulfate formaldehyde on the composition, properties and structure of magnesia stone before and after activation of the binder is studied. The most effective additive concentrations were determined to increase the compression strength of magnesia stone from 35 to 120 % at the age of 28 days. The optimal duration range of activation was established and scientifically validated its impact on physical-chemical and morphological properties of the obtained specimens.Conclusions. Activation of magnesia binder with additives under optimal treatment conditions in the vortex layer device allows to obtain a magnesia stone with an adjustable set of properties: high density, compression strength in grades. The increase in strength of modified magnesia stones activated in vortex layer device with the addition of plasticizer is explained by higher density structure, low crystallite size and high density of dislocations.
Structure and properties of magnesia stone obtained by activation of caustic dolomite
Introduction. The solution of the actual problem of deficit of reserves of raw materials with high MgO content by involving low-magnesian raw materials from dolomitized limestone into production is presented. For this purpose, it was proposed to increase the activity of the binder using preliminary mechanical activation in the vortex layer device. The aim of the study is to determine the effect of mechanical activation of caustic dolomite with plasticizers in the vortex layer device on the composition, structure and properties of magnesia stone.Materials and methods. Mechanical activation of the caustic dolomite was performed using a vortex layer device and the surface analysis of obtained specimens was carried out using a laser analyzer. X-ray analysis was used to determine the phase composition of the obtained specimens.Results. Regularities of hardening, phase composition of magnesia binders from duration of dispersion of caustic dolomite powder and concentration of plasticizing additives were investigated for the first time. A dense and strong matrix with high physical and mechanical properties is obtained. The effect of plasticizing additives based on lignosulfonate, polyester polycarboxylate and naphthalene sulfate formaldehyde on the composition, properties and structure of magnesia stone before and after activation of the binder is studied. The most effective additive concentrations were determined to increase the compression strength of magnesia stone from 35 to 120 % at the age of 28 days. The optimal duration range of activation was established and scientifically validated its impact on physical-chemical and morphological properties of the obtained specimens.Conclusions. Activation of magnesia binder with additives under optimal treatment conditions in the vortex layer device allows to obtain a magnesia stone with an adjustable set of properties: high density, compression strength in grades. The increase in strength of modified magnesia stones activated in vortex layer device with the addition of plasticizer is explained by higher density structure, low crystallite size and high density of dislocations.
Structure and properties of magnesia stone obtained by activation of caustic dolomite
Yu. V. Bikaeva (Autor:in) / R. A. Ibragimov (Autor:in) / I. D. Tverdov (Autor:in)
2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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