Conclusions
1. Fine mineral powders in the air-dry state contain 0.02–0.5 wt.% of vapors and gases adsorbed on their surfaces; the principal constituent of these is water.
2. Prolonged residence in vacuum of 1·10−9 mm T=20°C has practically no effect on the mechanical properties of the powders under investigation.
3. Heating the specimens at 450°C in vacuum will drive off most of the adsorbed material, and as a result there are marked changes in the interactions at the contacts between grains. Marked intergranular cohesion arises, and the angle of internal friction increases.
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Literature cited
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Additional information
Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 5, pp. 27–30, September–October, 1974.
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Shandor, V.V., Surkov, Y.A., Cherkasov, I.I. et al. Influence of adsorbed gases and water on the interaction between the grains of loose soils. Soil Mech Found Eng 11, 320–324 (1974). https://doi.org/10.1007/BF01705573
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DOI: https://doi.org/10.1007/BF01705573