The TRRL frost-heave test is nominated in the Department of Transport's Specification for Road and Bridge Works to establish the degree of frost-susceptibility of unbound sub-base and base materials. The test as originally described in LR 90 contained insufficient detail for it to be carried out in a standardised manner with granular materials. This led to problems both in carrying out the test and in the interpretation of results; the Laboratory therefore undertook a research programme to improve the test. This work has now been completed and this report contains a specification for an improved test procedure that has been developed from the results of the research. This procedure supersedes that given in LR 90 and other publications of the Laboratory which give details of the test. (A)

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