Abstract
The paper gives details of frost heave tests carried out on burnt and on unburnt colliery shales, the samples being obtained from 19 collieries in various parts of the country.
Whereas 11 of the 12 burnt shales tested were frost susceptible, this was the case for only 4 of the 17 unburnt samples and the relative behaviour of the two forms of shale is attributed to differences in absorption and in the amount and nature of the fine material present.
A limited study of the test conditions suggests that heave increases with increase in specimen moisture content at the time of compaction, with decrease in specimen dry density and with decrease in maximum particle size.
Recommendations are included for changes in the current test procedure and in the interpretation of the results.
Résumé
On décrit des essais de gonflement au gel réalisés sur des schistes houillers calcinés et non calcinés, avec des échantillons provenant de 19 houillères de différentes régions.
Si 11 des 12 schistes calcinés se sont révélés susceptibles au gel, cela n'a été le cas que pour 4 des 17 échantillons non calcinés: cet écart de comportement entre les deux formes de schiste est attribué à des différences d'absorption, ainsi que de quantité et de nature des fines présentes.
Une étude limitée des conditions d'essai suggère que le gonflement s'accroît avec l'augmentation de la teneur en humidité de l'échantillon au moment du compactage, avec la diminution de la dinsité sèche de l'échantillon et avec la diminution de la dimension maximale des particules. Cette étude s'accompagne de recommandations pour la modification de la méthode d'essai habituelle et l'interprétation des résultats.
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Kettle, R.J., Williams, R.I.T. Frost heave testing. Mat. Constr. 9, 99–107 (1976). https://doi.org/10.1007/BF02473865
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DOI: https://doi.org/10.1007/BF02473865