Based on recommendations of a 1970 engineering report, a 68.9-mile, fully controlled-access, dual-lane, 70-mph facility was proposed that would meet or exceed Interstate standards. The goals of the project, an extension of the Illinois East-West Tollway, were that the facility be of an improved design that could be constructed at a low cost and yet make use of readily available construction materials. To meet these goals, the design made allowances for (a) soil conditions along the corridor with special attention to high groundwater level and frost susceptibility characteristics, (b) ease and speed of construction, (c) safety, (d) riding comfort, and (e) expected performance and ease of maintenance. Four pavement types were examined: 10-in. reinforced pavement on permeable subbase, 8-in. continuously reinforced concrete pavement, flexible pavement, and the adopted design consisting of a 10-in. unreinforced concrete pavement on a 4-in. plain concrete base. When contracts were let, however, the contractors proposed an alternate of 14 in. of unreinforced pavement. This proved to be satisfactory for roadway traffic and provided easy maintenance and speedy construction. To date, only performance and need for maintenance remain to be tested. Soil moisture and temperature gauges have been installed at six critical soil locations to monitor long-term soil moisture-density conditions and to study frost action. As segments of the extension were completed, profilometer records were obtained to be used with future maintenance records and ridability determinations.

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Filing Info

  • Accession Number: 00080978
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Mar 26 1975 12:00AM