Forge Lexicon (from Omnitools) or the GregTech electric craftingtable can do it, provided TC registers its aluminium with the ore dictionary.
Alternatively, macerate the bars into dust and re-smelt them. A Railcraft blast furnace can handle aluminium fine if you don't have an industrial one yet.
Failing all that - throw them all away and spawn in the same number of GregTech ingots via NEI.