modern increases in traffic density and vehicle performance require an increasingly demanding specification for road surfaces in order to maintain an adequate resistance to skidding.the use of resin-bound surfacing systems,employing refractory-grade calcined bauxite aggregate of about 3mm in size,has given a significant reduction in accidents at a number of dangerous road sites.this report gives a summary of existing information relating to the performance of different aggregates in resin-bound surfacings,and relates this performance to the results of laboratory testing. further work,including the development of special tests, needs to be carried out before a firm specification for suitable aggregates can be drawn up,but the report includes such conclusions as can be drawn at this stage.the most important findings were:- 1. the best aggregates for resin- bound surfacings were certain calcined bauxites and similar corundum-rich materials.no other aggregates were entirely satisfactory,but of the materials studied,two irish basalts gave the best performance and two glassy materials gave the worst.2. good performance in resin-bound surfacings was associated with materials combining a minimum polished-stone value of 70 with a maximum aggregate abrasion value of 5.(a)

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