On April 1, 1982, the Federal Register announced that the Federal Highway Administration (FHWA) was adopting a document approved by the American Association of State Highway and Transportation Officials (AASHTO) which revises the chapter of the "AASHTO Interim Guide for Design of Pavement Structures 1972" concerning the structural design of rigid pavements.
Concrete possesses such a multitude of outstandingly useful properties that a fair number of them are totally unrecognized and others are rarely mentioned.
