EFFECT OF FREEZING–THAWING CYCLES ON DISINTEGRATION OF MOIST CLAY AGGREGATES

The article describes experimental research into the influence exerted by freezing–thawing cycles on disintegration of clay-containing compact aggregates in drum machines. The test pellets were made of two types of sand-and-clay mixtures having different clay contents and similar moisture content, with and without low-temperature treatment, as well as air-dried mixtures. In sand with clay admixture content of 50% and initial moisture content of 15%, after cyclical freezing–thawing within the temperature range from 253 to 293 K, structural bonding increase, which promotes strengthening and prevents soaking and failure. At the same time, after low-temperature treatment in the samples with clay content of 25%, strength loss is observed in clay aggregates from cycle to cycle: aggregates fail by the 40th minute after one cycle of freezing and thawing while their adhesion properties intensify in the form of the mass gain by 30% of the initial weight; after 4 cycles, aggregates totally disperse within 2 minutes without accumulation of materials from the circulating washing medium, which eliminates generation of compact pellets later on and improves washing efficiency.


The study was supported by the Russian Foundation for Basic Research, Grant No. 18-45-140004.

Keywords

Сlay, clay pellets, low-temperature treatment, disintegration, freezing, thawing, washing.

Issue number: 11
Year: 2018
ISBN:
UDK: 622.361
DOI: 10.25018/0236-1493-2018-11-0-192-198
Authors: Shirman G. V.

About authors: Shirman G.V., Junior Researcher, e-mail: shirman@inbox.ru, Chersky Mining Institute of the North, Siberian Branch, Russian Academy of Sciences, 677018, Yakutsk, Republic of Sakha (Yakutia), Russia.

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