Abstract
At the 18th world road congress, members of the technical committee on concrete roads of the permanent international association of road congresses (PIARC) were asked to consider five aspects of rigid pavements: design and behaviour in service, materials, construction and control, maintenance and rehabilitation, and subbases and road bases treated with hydraulic binders (both concrete pavements and semirigid pavements). Representatives from 28 nations responded with reports on the state of the art in their countries. Concrete pavement construction techniques around the world continue to improve, due at least in part to the sharing and dissemination of knowledge and technology.