Wearing courses of stone and mastic on pavements

Claim 1

Method of making wearing course on a roadway foundation resistant to lateral displacement in response to the stress of traffic, comprising: a. forming a uniform hot mixture consisting essentially of stones and mastic, the stones being more than 65 wt-%, the mastic being less than 35 wt-%, of the stone and mastic mixture, the stone being not less than about 2 mm, the mastic being at least 20 wt-% bitumen, the stone size being distributed within the range of 2-18 mm, b. applying the mixture at an elevated temperature as a covering layer over the foundation, and c. compacting the mixture to form the wearing course as a layer of mastic bonded to the foundation, substantially free of voids in which the stones covered with a film of mastic are embedded with stones protruding from the upper surface thereof, the quantIty and fluidity of the mastic and size distribution of the stone being such that during and after said compacting, the mastic flows into the interstices between the stones forming the wearing course as aforesaid and in which the volume of the mastic is less than the interstitial volume of the stones.