The number of construction projects in Colorado has dropped from March of 1972 (147) and March of 1973 (124) to March of 1974 (115). While it is conceded that other factors are at work, energy shortages, real or potential, have definitely limited the number, value and type of projects that Colorado is willing to obligate. Costs have increased due: (1) higher administrative and supervisory expenses; (2) scheduling (when is the best time to award grants?) uncertainties; (3) more travel time; (4) higher equipment rental rates. The quality of the projects may suffer due to: (1) supervisoring personnel seeking jobs in more stable fields of employment; (2) substitution of materials and designs. To supplement benefits achieved through material substitutions, Colorado is considering various changes in construction requirements. Under advisement are: 1) Designation as mandatory, material pits that will effect fuel saving. 2) Thicker lifts in embankment construction as long as density specifications are met. 3) Most economical balance of surface course and emulsified asphalt treated base thicknesses. 4) Use of dryer-drum mixers; and for standard asphalt plants, temperature-viscostiy relationships to establish the lowest permissible mixing temperatures. In the area of transportation planning emphasis is being placed on: preferential treatment for high occupancy vehicles, car pooling, and the National Transportation Energy Conservation Action Plan. The effect of the energy crisis on truck travel, air quality and travel demand are being analyzed. Traffic counting methods are being employed extensively. The reduction in the availability of asphaltic materials has given rise to investigation of the following problems: (1) elimination of the use of rapid curing "cut-Back" liquid asphalt; (2) partial elimination of and substitution for medium curing "cut-back" liquid asphalt; (3) improving the penetrating quality of emulsified asphalt for use as a prime coat; (4) substituting other stabilizing agents for emulisified stabilized base. The rapidly improving cost position of rigid vs. flexible pavement is being closely watched. Bridge design personnel are investigating construction methods and design procedures that could reduce fuel consumption and materials usage. Maintenance changes revolve around reduced consumption of energy: 1) More efficient planning in use of equipment and personnel. 2) Mowing is being restricted. 3) Reduction of some interchange lighting has been accomplished. 4) Rejuvenation of old asphalt mats is being actively considered.
- This report is from the WASHO Conference held in Portland, Oregon from June 2-6, 1974.
Western Association of State Highway & Transp OffAASHTO, 341 National Press Building
Washington, DC USA 20004
- Haase, E N
- Publication Date: 1974-6
- Pagination: 14 p.
- TRT Terms: Asphalt pavements; Building materials; Contracts; Costs; Emulsified asphalt; Energy; Flexible pavements; Maintenance practices; Pavement design; Rigid pavements; Road construction; Traffic counting
- Subject Areas: Administration and Management; Economics; Energy; Finance; Highways; Maintenance and Preservation; Pavements; Society;
- Accession Number: 00260275
- Record Type: Publication
- Report/Paper Numbers: Proceeding
- Files: TRIS
- Created Date: Aug 28 1974 12:00AM