the trrl frost heave test described in lr90 is nominated in the department of transport specification for road and bridge works as the test to establish the degree of frost-susceptibility of unbound sub-base and base materials. the description given in lr90 does not contain sufficient detail for the test to be carried out in a standardised manner with granular materials. this report therefore contains an explanation of the basis of the test procedure and a detailed specification for carrying it out.(a)

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