Abstract
The given article contains the research results of the waterproof magnesia cement production on the basis of Kazakhstan mineral resources by the introduction of additives of natural and synthetic wollastonite and calcium hydrosilicate. The input additives promote a considerable consolidation of the magnesia stone’s structure and increasing water resistance coefficient from 0,56 to 0,93. The produced magnesite cement can be used for building of radi o -protective constructions, manufacturing plates and panels for internal and external facing of buildings, making seamless floors, garages, car park s , working areas , etc.
Highlights
The requirement for binding constructional materials is great, and its satisfaction only at the expense of widely applied Portland cement is difficult
The fulfilled experiments allow establishing that from the point of view of efficiency and economic reasonability the most perspective way of increasing water resistance of the magnesia cement is its modification by various fine-dispersed mineral additives
For the obtaining of compositions on the magnesia cement basis, the caustic dolomite was mixed with the crushed additives in number of 5-30 %
Summary
The requirement for binding constructional materials is great, and its satisfaction only at the expense of widely applied Portland cement is difficult In this connection in the low-tonnage housing and agricultural construction it is expedient to use cheaper binding materials, in particular, magnesia and composite magnesia binding agents, received on the basis of local raw materials The published currently the research results contain opposite data (Shelikhov et al, 2008) It is known, that at an identical duration of roasting a formed phase, MgO, in dolomite cement has higher activity at hardening than the same phase in caustic magnesite; this fact is confirmed by a smaller size of its crystals (Shelikhov and Rakhimov, 2006). One of the reasons of this effect is the presence in dolomite cement of a non-decomposing at the dolomite’s roasting carbonate phase, СаСО3, which can interfere with formation and growth of MgO crystals owing to epitaxial and endotaxial phenomena which take place at the decomposition of solid substances (Boldyrev, 1997; Prodan, 1986; Sglavo et al, 2011)
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