Composite structures

A composite substrate for a fiber reinforced plastic part comprising a first outer thermoplastic sheet, an intermediate conductive layer or layers, and a second inner thermoplastic sheet. The composite substrate formed by electrically resistively heating the conductive layer or layers to melt the thermoplastic sheets, and applying pressure to consolidate the layers into a rigid substrate. The conductive layer or layers formed of a conductive fiber mat or tape. Additionally, a method is disclosed comprising providing a conductive filament impregnated with a resin; running the conductive filament through an electrical contact, the electrical contact connected to a supply of electric power; and, winding the filament to a mandrel including a second electrical contact connected to said supply of power. Electricity is then induced through the filament from the first contact to the second contact to resistively heat the filament and cure the resin. Additionally, a composite structure and method for curing a concrete object placed on, or in close proximity to the structure. The composite structure comprises an upper section having a fiber architecture impregnated with a resin, where the fiber architecture is formed from a plurality of conductive fibers. A lower section having a portion of insulation material and a portion of heat reflective material, where the insulation material is adapted to insulate the structure, and where the reflective material is adapted to reflect heat from the lower section to the upper section. A plurality of electrical contacts, where the contacts are connected to the conductive fibers in the upper section. A plurality of electric leads connected to the contacts and a power source. The upper section having an outer surface adapted to receive the object, the outer surface having an epoxy coating. The lower section has an outer surface, with an epoxy coating. The upper section further having a portion of high-strength materials adapted to support the concrete object. The fiber architecture further comprises a plurality of non-conductive fibers.