In eastern Kentucky, deep deposits of sandstones and shales overlie the vast deposits of limestones that prevail throughout the central part of the state. Whereas locally available limestones of high quality comprise the major sources of crushed stone or aggregate for highway paving in the central part of the state, some areas of eastern Kentucky are so far removed from sources of these and other high-type aggregates that transportation of materials becomes a major cost item. It is a matter of record that these costs frequently approach or even exceed the cost of the material at the source. Since aggregate comprises the greater bulk of a paving mixture; transportation costs, to a large extent, determine the selection of the type and source of the material.
Digital Object Identifier
Williams, Ellis G., "A Test Road for the Evaluation of Sandstone as an Aggregate in Plant-Mix Bituminous Pavements" (1952). Kentucky Transportation Center Research Report. 1292.