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The research done by the Byelorussian National Technical University in collaboration with the special-ists of the Republican Unitary Enterprise «Belorussian Road Research Institute» and SPA «Center» made it possible to develop the efficient method to obtain the activated mineral powder by fine milling of the agglu-tinant sand. The mineral powder can be a full value equivalent for a dolomite mineral powder which is now used in highway engineering. The presence of organic binders on the surface of the powder affords 10-20% economy of bitumen and permits the process of bitumen aging to be slowed down. Roadway coverings built with the usage of quartz activated powders are more durable.
Mineral powders are a scarce material which is used in the production of road concrete mix and that is why a considerable part of asphalt concretes is produced without them. It causes their high porosity and fast disruption especially due to the cycles of freezing-defrosting. All this leads to the improper state of roadway coverings and heavy expenses for their repairs.
Hence the production of powders from the used agglutinant sand will make it possible to expand greatly raw materials base of highway engineering, to improve the quality and service life of roadway cover-ings.
Besides, up to15 % of coarse mineral material (sand) obtained after comminuting can be used as a re-turn material together with the supplied sand in foundry at preparing the agglutinant sand which will be rather economically effective.
According to the calculations done by the Republican Unitary Enterprise «Minsk Tractor Plant» the period of recoupment of a complex to obtain mineral additives from the used agglutinant sands will be less than a year.
19.05.2012