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In this appendix some information on aggregate properties is given. First some properties of currently produced British aggregates, second some more generalized data on aggregate properties worldwide, and third some information on how weathering affects the properties of aggregates. It is strongly emphasized that all the information given in this Appendix must be regarded as providing only a general appreciation of aggregate properties and should not be relied upon for specific test values for particular rocks or sources.

Table A1 gives some test results for 96 aggregates from quarries in Great Britain. The information is not exhaustive but comes solely from fact-sheets issued by the suppliers or from information provided to members of the Working Party by the suppliers. None of the data has been confirmed independently. Where the quarry is not named in the Table this omission is at the request of the supplier. Because aggregate properties are liable to vary, the test results in the Table should not be taken as an indication of present production for particular quarries; instead prospective users should seek up-to-date information from the suppliers. It should be borne in mind that suppliers will not usually work poor quality sources of aggregate, nor provide data on them.

The rock descriptions are those of the suppliers, supplemented in some cases by reference to entries in directories of quarries (BGS 1984 and BACMI 1986). The classification in Table A1 is by the broad rock groups used in the

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