Patent ID: 8636441

Claim:
A precast roadway slab which comprises (i) a one piece casting of concrete, (ii) a plurality of spaced, first pre-tensioning elements extending in a longitudinal direction of the slab at a first elevation thereof, the first pre-tensioning elements being bonded to the concrete and in a detensioned state, and (iii) a plurality of spaced, second pre-tensioning elements extending in a direction substantially perpendicular to the longitudinal direction of the slab, the second pre-tensioning elements being (a) bonded to the concrete and in a detensioned state and (b) located at a second elevation of the slab that is spaced above the first elevation, and at a third elevation of the slab that is spaced below the first elevation, said concrete having a compressive force transferred thereto by said bonding of said detensioned first and second pre-tensioning elements to said concrete.