Energy conserving paving method and apparatus using...

E - Fixed Constructions – 01 – C

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94/49, 327/1.7

E01C 7/06 (2006.01) E01C 19/00 (2006.01) E01C 19/46 (2006.01) E01C 23/06 (2006.01) E01C 23/14 (2006.01)

Patent

CA 1117341

ENERGY CONSERVING PAVING METHOD AND APPARATUS USING MICROWAVE HEATING OF MATERIALS Abstract of the Disclosure Asphaltic concrete constituents or the like deposited in a windrow along a surface to be paved are molded into a preliminary narrow layer of greater height than the final layer of pavement to be formed on the surface and are then heated by directing microwave energy into the preliminary layer. The heated preliminary layer is then spread out to form the final thinner layer of paving material for smoothing and compaction. Molding means for the prelim- inary layer and microwave heating means may be carried on a vehicle which travels along the windrow. The vehicle may also carry mixing, spreading and compaction means or some or all of these elements may be on a separate paver vehicle. The method and apparatus reduces an unproduc- tive dissipation of energy, which can occur if microwave heating is performed with the paving materials spread out in the relatively thin final layer, by avoiding unnecessarily deep penetration of the microwave energy into the underlying surface that is to be paved. Auxil- iary heating means, preferably using thermal energy recovered from the exhaust of engines which drive the electrical generators that energize the microwave sources may be used to preheat portions of the surface adjoining the portion overlain by the preliminary layer.

331016

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