"Road construction." . . "Publications officielles" . . . . "This report reviews the current status of availability of acceptable aggregates for highway construction, and notes areas where shortages now exist or can be expected to occur in the forseeable future. Various possible ways for alleviating shortages, including techniques for benefiting existing low-quality natural aggregates, and processes for manufacturing synthetic aggregates from various source materials, including waste materials, are suggested. The research effort was confined to a workshop-conference and a supplemental literature study that provided a good overview of the aggregate situation, both present and future. 14 principal areas for research were identified in the study." . . . . . "Promising replacements for conventional aggregates for highway use" . "Promising replacements for conventional aggregates for highway use"@en . . . . . "National cooperative highway research program report" . "Promising Replacements for Conventional Aggregates for Highway Use" . . "Artificial aggregates." . . . . "National Research Council (É.-U.). Highway Research Board." . .