Bridge decks deteriorate faster and require more maintenance and repair than any other structural components on highway bridges. Topical protection systems act as barriers to protect bridge decks from corrosion damage by preventing water, oxygen, and chloride ions from reaching the reinforcement. This study evaluated topical protection systems commonly used on highway bridge decks in Colorado, including low-permeability concrete overlays and waterproof membranes with asphalt overlays., Cover title., "August 2010.", "Report No. CDOT-2010-6, final report.", Includes bibliographical references (p. 58-60), Mode of access: World Wide Web.
While much has been achieved in upgrading and improving the Traffic Records System in Colorado, significant problems remain. Most databases still function as islands of information with limited data sharing and integration. Data remains inconsistent from one dataset to another. The quality of some data is questionable and accessibility is limited. While an initial plan was to develop a Traffic Records Virtual Data Warehouse (TRVDW) to provide a comprehensive, complete, accurate, data resource, the TRVDW feasibility study revealed the concept to be too costly for implementation. This Strategic Plan provides a number of goals and objectives for improvements to the Traffic Records System. All of them serve the ultimate goal of a well integrated Traffic Records System delivering timely, high-quality data for appropriate traffic safety decisions at all levels., "May 2012.", Online resource; title from PDF cover (viewed December 2015)
The overall conclusion of the study is that application of magnesium chloride deicer having a chemical composition and application rate similar to those of 1997-98 is highly unlikely to cause or contribute to environmental damage at distances greater than 20 yards from the roadway. Even very close to the roadway, the potential of magnesium chloride deicer to cause environmental damage is probably much smaller than that of other factors related to road use and maintenance, including pollution of highway surfaces by vehicles and use of salt and sand mixtures to promote traction in winter. Magnesium chloride deicer may offer net environmental benefits if its use leads to a reduction in the quantity of salt and sand applied to roadways. The environmental safety of magnesium chloride deicer depends, however, on low concentrations of contaminants and avoidance of rust inhibitors containing phosphorus. Appropriate specifications for vendors and routine testing can insure the continued environmental acceptability of magnesium chloride deicers. Deicers provided by vendors should be monitored independently by CDOT for chemical characteristics. Any significant changes in processing or source material should be disclosed by the vendor. Colorado-based specifications should be developed for vendors. Independent specifications for low elevation could be developed, or the more stringent high elevation specifications can be applied to all purchases., Final report., "Performed by, Western Environmental Analysts"--Technical report documentation p., "Prepared in cooperation with the U.S. Dept. of Transportation, Federal Highway Administration"--Technical report documentation page., Sponsored by Colorado Dept. of Transportation., "November 1999.", Includes bibliographical references (leaf 34)., Mode of access: World Wide Web.
Final report., Performed by University of Colorado Dept. of Civil, Environmental and Architectural Engineering in cooperation with the Federal Highway Administration under contract no., "December, 2003.", Includes bibliographical references (p. 25-27)., Mode of access: World Wide Web.
Based on the study presented in this report, it was determined that S50 structural concrete can be produced to meet the requirements of the CDOT Standard Specification for Road and Bridge Construction., November 2007., "Report No. 2007-15, Final Report.", Includes bibliographical references (p. 16)., Mode of access: World Wide Web.
Self-consolidating concrete (SCC) is a stable and highly flowable concrete that consolidates without the help of external vibration and can flow through heavy reinforcement and around corners in complex formwork under its own weight. The exceptional performance of this remarkable material has attracted the attention of construction firms and DOTs in the United States interested in using SCC on new bridge construction and bridge repair projects., Cover title., Report No. CDOT-2007-1, Interim Report.", "April 2007.", Includes bibliographical references., Mode of access: World Wide Web.
The purpose of this study was to determine the procedures and possible benefits associated with flowing concrete. Based on the study presented in this report, it was determined that SCC was used successfully in the I-25 bridge replacement project in Trinidad. Unfortunately, the all-around lack of construction experience with SCC resulted in numerous aesthetic problems that are atypical of the material., "Report No. CDOT-2010-9, Final Report.", "Sponsored by the Colorado Department of Transportation in cooperation with the U.S. Department of Transportation Federal Highway Administration.", "December 2010.", Includes bibliographical references (p. 25).
States' Departments of Transportation (DOT) are trying to utilize the best practices of managing low-volume roads (LVRs) due to limited resources and declined transportation funding. Diverse maintenance practices and fluctuating budget allocations are noticed on LVRs which significantly impact the overall pavement performance. In this study, the optimal scheduling of maintenance strategies and effectiveness of different maintenance policies are investigated., Marwan Hafez, Khaled Ksaibati, Rebecca Atadero., "February 2020.", Report No. CDOT-2020-03, Online resource; title from PDF cover (viewed March 2020)
This project focused on the chloride-induced corrosion of reinforcing steel in structural concrete. The primary goal of this project is to analyze the surface chloride concentration level of the concrete bridge decks throughout Colorado. The study indicates three factors that can affect chloride concentration levels in bridge decks: age of the concrete, traffic, and weather. Samples were collected from decks and curbs of bridges in different climate regions with various concrete ages and traffic levels. Water-soluble chloride concentrations were tested for all samples. Chloride concentration profiles for all the locations were listed and plotted. The deepest concrete powder was collected at a depth of 2 inches. The rebar level of the bridge was usually at or below this depth. The chloride concentrations of most bridge decks were below the critical values at the rebar level. The chloride concentrations of bridge decks are usually greater than that of bridge curbs. However, these bridge curbs showed deeper chloride penetration than the bridge decks. Younger bridges had much lower chloride concentrations, which is expected. Heavier traffic resulted in higher chloride concentrations. The bridges built in colder regions had a higher chloride concentration up to 2" depth (the rebar level). Climate may be the most significant influential factor among age, traffic, and climate when considering chloride concentration of bridge decks in Colorado. Corrosion protection should focus on the bridges decks who locate in the cold climate zone and with high traffic volume., Yunping Xi, Yuxiang Jing, Renee Railsback., "January 2018.", "Prepared in cooperation with the US Department of Transportation, Federal Highway Administration"--Technical documentation report page., Includes bibliographical references (pages 38-40)., Final., Online resource; title from PDF cover (viewed August 2019), Report No. CDOT-2018-05
Pavement construction and maintenance problems due to the presence of sulfates in limestabilized subgrade soils have been widely reported in many transportation projects. In Colorado, problems associated with sulfate-induced distresses have been observed at the Denver International Airport and, more recently, at the U. S. Highway 287 Berthoud By-pass project. It would be desirable if CDOT engineers could count on alternative soil stabilization techniques that are not affected by the potential presence of sulfates., Antonio Carraro, Emily Budagher, Mahir Badanagki, Jong Beom Kang., "Sponsored by the Colorado Department of Transportation In Cooperation with the U.S. Department of Transportation, Federal Highway Administration.", "July 2013.", Bibliography: pages 22-24., Report No. CDOT-2013-2, Final Report., Online resource; title from PDF cover (viewed March 2016)
This report provides a synthesis on the use and design of snow sheds to protect transportation corridors against avalanches. This report summarizes the various snow shed designs and standards, regulation environment, construction and operational costs, risk, benefits, loading considerations, operational and design considerations, and alternate methods employed when snow sheds are no longer needed, or when alternative long-term mitigation measures are employed., Jordy Hendrikx, Alan Jones, Andrew Schauer, Ryan Buhler., "October 2020.", "Performing organizations: Snow and Avalanche Laboratory, Department of Earth Sciences, Montana State University, Bozeman, MT, USA; Dynamic Avalanche Consulting, Revelstoke, BC, Canada.", Includes bibliographic references., Report No. CDOT-2020-13.", Online resource; title from PDF cover (viewed March 2021)
Ahmad Ardani., Prepared in cooperation with the Federal Highway Administration., Technical Report number: CDOT/DTD/R-91/3., Includes bibliographical references (page 20)., Print version record.
