초록 ▼

Portland cement concrete at a roadbed, bridge deck or the like is quickly and deeply heated and dried by directing microwave energy into the concrete and by applying hot gas to the surface. A layer of thermoplastic sealant is applied to the hot concrete followed by an overlayer of asphaltic concrete

Portland cement concrete at a roadbed, bridge deck or the like is quickly and deeply heated and dried by directing microwave energy into the concrete and by applying hot gas to the surface. A layer of thermoplastic sealant is applied to the hot concrete followed by an overlayer of asphaltic concrete having a higher softening temperature than the sealant layer. Compaction then produces a composite pavement which is sealed against water intrusion and which can be quickly, easily and economically resealed and resurfaced at a later time using little or no additional paving materials. Resealing and resurfacing is accomplished by deeply reheating all three layers by microwave irradiation followed by recompaction. If cracking and deterioration are severe, the asphaltic concrete layer may be remixed and rescreeding between the reheating and recompaction steps. Both the initial production of the composite pavement and the restoration processes can be accomplished on a continuous process basis while traveling along the roadbed, bridge deck or the like.

대표청구항 ▼

A method for sealing cement concrete pavement comprising the steps: directing microwave energy into said cement concrete pavement to generate heat within sub-surface regions of said concrete pavement, applying a layer of thermoplastic sealant to the surface of said heated cement concrete pavement, s

A method for sealing cement concrete pavement comprising the steps: directing microwave energy into said cement concrete pavement to generate heat within sub-surface regions of said concrete pavement, applying a layer of thermoplastic sealant to the surface of said heated cement concrete pavement, said sealant being temporarily in a hot, at least semi-liquid condition while in contact with said heated cement concrete pavement, applying an overlayer of asphaltic concrete on said sealant layer, and compacting said overlayer of asphaltic concrete and said sealant layer against said concrete pavement while still in a heated condition to produce a sealed composite pavement which may be resealed at a later time by a repeated heating and recompaction.