B. B. Gerhardt
Author
Publisher
Colorado Division of Highways, Planning and Research Division
Pub. Date
1972.
Language
English
Description
Mechanical ventilation of tunnels is costly because of the initial installation and the continued maintenance and operation. However, at some tunnel length corresponding to a particular altitude, traffic configuration and topography there is a need for this forced ventilation. This study was undertaken to help determine the pollution concentration in existing tunnels in Colorado, and predict the length of tunnels which will need mechanical ventilation....
Author
Publisher
Colorado Division of Highways, Planning and Research Division
Pub. Date
1970.
Language
English
Description
The swelling characteristic of Mancos Shale in Western Colorado has caused a great deal of maintenance problems ever since highways were paved. In an attempt to find a method to reduce or prevent this swelling, 19 test sections were included in a contract on IInterstate 70 near Grand Junction. After eight years of evaluation it has been concluded that Asphalt membranes on top of the subgrade and subexcavation and backfilling with an A-4 soil are good...
Author
Publisher
Colorado Division of Highways, Research and Special Studies Section
Pub. Date
[1972]
Language
English
Description
Air pollution is a matter of concern everywhere, but at high altitudes it may have more significance because of the difficulty that some people have breathing rarefied air. Much of the construction in Western states is above the 6,000 foot level, and highways have been constructed above the 14,000 foot level. The results of tests for carbon monoxide, hydrocarbons, nitrogen oxides and particulates at construction sites in Colorado are presented in...
Author
Publisher
Not Supplied
Pub. Date
1974.
Language
English
Description
This particular Colorado study was initiated to gather and analyze facts on the performance of embankments constructed without moisture and/or density control, and to draw specific conclusions which might assist designers of future roadway embankments.