Engineering and Contracting . istance of 15 milesfrom Louisville. This traffic probably comprises 60 percent of the total tonnage and is heaviest in the springand early summer, although much manure hauling is donein the fall of the year. Three and 4-horse loads are fre-quently hauled. (2) Heavy motor truck traffic is of nextimportance, including brewery trucks, moving vans and in a storage pile, where it remains until loaded into rail-road cars for shipment to points at which roads are tobe built. Properties of Prepared Rock Asphalt. Rock asphalt prepared for paving purposes resemblesin many r
Engineering and Contracting . istance of 15 milesfrom Louisville. This traffic probably comprises 60 percent of the total tonnage and is heaviest in the springand early summer, although much manure hauling is donein the fall of the year. Three and 4-horse loads are fre-quently hauled. (2) Heavy motor truck traffic is of nextimportance, including brewery trucks, moving vans and in a storage pile, where it remains until loaded into rail-road cars for shipment to points at which roads are tobe built. Properties of Prepared Rock Asphalt. Rock asphalt prepared for paving purposes resemblesin many respects ordinary prepared Topeka specificationsheet asphalt paving material, with the exception that atordinary summer temperatures the rock asphalt is suf-ficiently fluffy and mealy to be quite easily handled andspread without artificial heating. When the material isspread in a thin layer as in a pavement surface, rolledand subjected to the kneading action of traffic, a thincrust forms on the surface and the pavement becomes. Fig. 2—Texture of Surface Before Rolling Stone Base. wholesale merchants delivery trucks. This traffic prob-ably comprises 20 per cent of the tonnage. (3) Automo-bile traffic probably comprises 15 per cent of the ton-nage, and the remaining 5 per cent consists of light ve-hicle traffic with an occasionally heavy load. The auto-mobile traffic probably averages 150 to 200 machines in 24hours. Manufacture of Rock Asphalt. The rock asphalt so far used on all of the JeffersonCounty work is quarried and manufactured near BowlingGreen, Ky., by the Wadsworth Stone & Paving Co. ofPittsburgh, Pa. In the quarry from which the raw material was ob-tained the rock asphalt occurs as a bituminous sandstoneledge varying from 6 to 30 ft. in thickness with an over- Fig. 3—Texture of Surface After Rolling Stone Base. hard and smooth. This hardening is perhaps due to com-pacting and the evaporation of some of the light oils inthe crust. Rock asphalt is less slippery than
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