| 摘要 |
FIELD: manufacture of building materials. SUBSTANCE: Proposed method is, in particular, designed to be applied in manufacturing facing building parts. Invention concerns a method wherein magnesia binder is mixed with filler followed by tempering with bischofite salt solution. Method of invention is distinguished with that, before the mix is tempered, bischofite solution is preliminarily treated in magnetic field with strength 160-340 kA/m at solution flow velocity in magnetic field 0.6-1.5 m/s. Components are introduced into mix in following amounts, wt.-%: magnesia binder, 40-50; bischofite solution with density 1.17-1.22 g/sq.cm, 22-33; and filler, the balance. Preliminary magnetization of bischofite solution favors formation of denser and more fine structure of material resulting in 41% increase of bending strength of parts and more than three-fold increase of their frost resistance. Effect of preliminary magnetic treatment strengthens when, prior to be magnetically treated, bischofite solution is supplemented with hydrophobizing liquid or industrial-quality latex and cupric sulfate and also when bischofite solution is repetitively passed through magnetic field. EFFECT: increased strength and water-resistance of building parts. |
