the transport and road research laboratory is carrying out research into the manufacture of economically priced synthetic aggregates with resistance to polishing by traffic which is higher than that normally achieved by naturally occurring aggregates. such aggregates are required for the surface treatment of difficult road sites where high resistance to skidding is required and where the polishing action of traffic is most severe. this report describes work which has been carried out under contract into the manufacture on a pilot scale of an aggregate using blastfurnace slag as a matrix and containing particles of calcined bauxite. this work has shown that the process is not likely to be commercially viable because it would require rapid mixing of the ingredients at a high temperature followed by rapid cooling, which would be incompatible with the needs of commercial production. (a)

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