Puddled

Puddled - Made waterproof.
Putlog - Beams placed in holes to support a hoarding; horizontal scaffold beam
Putlog Hole - A hole intentionally left in the surface of a wall for insertion of a horizontal pole.

The carriageway would have been surfaced in cobbles, hand set into puddled clay. The core of the bridge, would probably have been clay, beaten earth, gravel and stone, with another membrane of puddled clay above the arches.

See also: Coping, Rubble, Segmental, Spandrel, Spring