Abstract: A highway pavement of concrete slab-on-grade surface includes a prestressed portland cement concrete surface layer which is mounted on a non-freezing low restraint support grade layer without any linear physical connection thereto in such a manner as to permit freedom of movement toward the midpoint of the surface layer. The surface layer is thereby able to slide in response to temperature and moisture changes in the environment including at temperatures below the freezing point of water. The surface layer has a riding surface of generally the same rideability five years after installation as it does at the time of installation.

Abstract: A self-equilibrating coupler suitable for simultaneous tensioning of two ends of cable, said coupler having two uniformly curved surfaces in one plane, in fixed position one to the other, the two curved surfaces curving from each other in an amount sufficient to permit jacking and anchoring of both cable ends, the two curved surfaces being separated in the said plane, at the coupler geometric center, in an amount at least as great as twice the diameter of the cable, and the tangents at the entering point of each cable on the curved surface being separated within the plane in an amount equal to one cable diameter.