Post tension cable is the cable they put inside concrete slabs to increase the strength of the slab. Post-tension cable is stretched after the concrete hardens. Its not the same as rebar. See below.
"Concrete is very weak in tension but extremely strong in compression. Post-tensioning acts on the concrete structure or elements by compressing the cast-in-place concrete to high pressures. Some advantages of post-tensioned concrete include crack control and lower construction costs.
Post-tension materials (PT) can provide thinner slabs and is especially important in high rise buildings in which floor thickness savings can translate into additional floors for the same (or lower) cost. PT can optimize constructability by having fewer joints since the distance that can be spanned by post-tensioned slabs exceeds that of reinforced construction with the same thickness. Architects like having a PT option since increased span lengths also increases the usable floor space in buildings and provides more parking spaces in garages. Post-tensioning has advantages over pre-cast since it has lower maintenance costs over the life-cycle of the structure. Architectural shapes other than rectangles give post-tensioning an advantage over pre-cast, as well, since strands in cast-in-place construction can be curved or swept into place." Source: http://ptestrandcompany.thomasnet-navigator.com/item/all-categories/post-tension-systems-materials/item-1001?
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