Abstract
The article is devoted to the investigation of the influence of technological factors on the hydration and hardening of magnesia compositions. The objective – is investigation magnesia compositions with different additives. Factors which impact activity of magnesium oxide in compositions of different structure are investigated. Influence of liquid density on hardening of magnesium bindings is defined. Processes of hydration and hardening of magnesium bindings with participation of minerals – silicates are investigated. It is revealed that the addition of semi-aquatic calcium sulfate contributes to the hardening of magnesia binders. Defined effect of concentration calcium sulfate hemihydrate to the hardening of caustic magnesite. Here are proposed structures of sulphomagnesium compositions containing technogenic components. It revealed a beneficial effect on the hardening of ferrous component of the mixed magnesia binder. Composition of hydration products of magnesium binding with participation of ferriferous minerals is presented. Transformations of phases at hydration of magnesium binding are revealed. Influence of structure of bindings on transformations of hydrates is established. Results of research of magnesia bindings of long hardening are given. It is shown that the durability of stone of bindings is provided with dense structure of hydrates. In researches are used X – Ray and thermal methods, electronic microscopy.
Highlights
Magnesia binders reveal activate capacity in relation for various materials
Magnesia compositions characterized by low energy intensity of production, intensive hardening and high strength
In the experiments used minerals that are predominant in the composition of the studied technogenic materials
Summary
Magnesia binders reveal activate capacity in relation for various materials. This became background for getting mixed binders from caustic magnesite and mineral component [1 – 7]. The combination of caustic magnesite of natural and technogenic materials expands the range and increased the volume of magnesia binders. Magnesia compositions characterized by low energy intensity of production, intensive hardening and high strength. Containing of magnesium component in the composition of mixed binders is 50 – 70 %. It is necessary to reduce deficit caustic magnesite in the composition with mixed binders. The advantages of mixed binders are to improve the physical and mechanical properties while saving caustic magnesite and rational use of natural and technogenic raw materials. The purpose of the work is synthesis and investigation magnesia compositions with different additives
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