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A comparison of resistance to deformation of rolled asphalt has been made at 45° using eight mechanical tests. The compositions tested conformed to B.S.594 and the comparison showed that these cover a wide range of stability. Some rich plastic mixtures included in B.S.594, although rejected after mechanical tests, can be used successfully on the road. Dynamic loading tests employing préssures experienced on the road appear to give the best relative assessment of stability for the compositions best suited to conditions in Great Britain.

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