this report describes an experiment to determine whether there was any basis for the reported difference in tar content obtained when dense slag-tarmacadam is analysed by the hot-extractor and sieving-extractor methods of analysis. the results obtained showed that there was a small quantative difference of about 0.1 per cent in tar content between the two methods of analysis, the hot-extractor results being the greater. there were significant differences between the gradings obtained by the two methods, caused by difficulty in completing the grading following hot-extraction. (a)

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