The principle objectives of this research were:

  1. To compare the economics and performance of coal tar to asphalt cement;
  2. To develop reliable coal-tar construction specifications;
  3. To familiarize personnel with coal-tar construction; and
  4. To implement Section 201, Subsection d and e, of the Appalachian Regional Development Act of 1965.

To accomplish these objectives, a 6.6-mile experimental section utilizing coal-tar (RT-12) concrete base and surface and 5.1-mile and 5.7-mile control sections utilizing asphalt (PAC-5) concrete base and surface were placed on relocated KY 15 in Perry, Knott, and Letcher Counties during the 1969 and 1970 construction seasons. The pavement consisted of an 11-inch DGA base, two 2 1/2-inch Class I base courses, and a 1 1/2-inch Class I, Type A surface course. The coal tar was supplied by the Barrett Division of Allied Chemical Corporation.

This report covers the Research Division's task of writing the special provision for the coaltar concrete, surveillance of the construction, laboratory evaluation of the paving materials, and analysis of the comparative performance of the experimental and control sections.

Report Date


Report Number

No. 309

Digital Object Identifier