Search results | Colorado State Publications Digital Repository

Title: Evaluation of soil resources for sustained vegetative cover of cut-slopes along I-70 near Straight Creek
Abstract: A report that evaluates the stability of re-vegetation of high elevation, decomposed, granite cut-slopes by using repeated applications of soil amendments.
Date: 2013
dc.title: Evaluation of soil resources for sustained vegetative cover of cut-slopes along I-70 near Straight Creek

Title: Developing criteria for performance-based concrete specifications
Abstract: A report that explains testing of standard mix designs to determine minimum-required performance levels for developing performance-based concrete mix design criteria.
Date: 2013
dc.title: Developing criteria for performance-based concrete specifications

Title: Functional assessment of Colorado wetlands (FACWet) method
Abstract: The FACWet was developed by surveying existing wetland rapid assessment methodologies and blending the best aspects these approaches with the most recent advances in wetland science.
Date: 2013
dc.title: Functional assessment of Colorado wetlands (FACWet) method, Colorado Department of Transportation's Functional assessment of Colorado wetlands (FACWet) method user manual

Title: Optimum use of CDOT French and Hamburg data (French and Hamburg tests)
Abstract: The Colorado Department of Transportation (CDOT) has been collecting data from the Hamburg Rutter and the French Rutter for over 20 years. No specifications have been written in that time for either the Hamburg Rutter or the French Rutter. This is largely due to the need for a companion test to be developed so dry asphalt mixes would not be designed specifically for passing the Hamburg Rutter test. This report looks at the state of practice within other states that own similar equipment. Cracking tests that could be run with the Hamburg Rutter are examined from a review of literature to determine if there is a suitable companion test for the Hamburg Rutter that would work to keep asphalt levels in the mix high enough to prevent cracking and fatigue.
Date: 2013
dc.title: Optimum use of CDOT French and Hamburg data (French and Hamburg tests)

Title: Implementation of the AASHTO mechanistic-empirical pavement design guide for Colorado
Abstract: The objective of this project was to integrate the American Association of State Highway and Transportation Officials (AASHTO) Mechanistic-Empirical Pavement Design Guide, Interim Edition: A Manual of Practice and its accompanying software into the daily pavement design, evaluation, rehabilitation, management, and forensic analysis practices and operations of the Colorado Department of Transportation (CDOT).
Date: 2013
dc.title: Implementation of the AASHTO mechanistic-empirical pavement design guide for Colorado

Title: U.S. 287 Lamar reliever route environmental assessment
Date: 2013
dc.title: U.S. 287 Lamar reliever route environmental assessment, Environmental assessment, U.S. 287 at Lamar reliever route Prowers County, Colorado, United States 287 Lamar reliever route environmental assessment

Title: Record of decision 2 for the I-25 Valley Highway, Logan to US 6 Denver, Colorado, for the portion including the US 6 bridges design build project
Date: 2013
dc.title: Record of decision 2 for the I-25 Valley Highway, Logan to US 6 Denver, Colorado, for the portion including the US 6 bridges design build project, Record of decision 2: US 6 bridges design build project, US 6 bridges design build project

Title: Evaluation of seismic testing for quality assurance of lime-stabilized soil
Abstract: This study sought to determine the technical feasibility of using seismic techniques to measure the laboratory and field seismic modulus of lime-stabilized soils (LSS), and to compare/correlate test results from bench-top (free-free resonance) seismic testing on LSS cylinders to in-situ (surface seismic) testing performed on field-constructed LSS. In addition, this research sought to develop a pilot specification for quality assurance (QA) of LSS using seismic test methods.
Date: 2013
dc.title: Evaluation of seismic testing for quality assurance of lime-stabilized soil

Title: I-25/Arapahoe interchange finding of no significant impact
Date: 2013

Title: Safety performance functions for freeway merge zones
Abstract: This report documents the results of a research project to support CDOT in the area of Safety Performance Function (SPF) development. The project involved collecting data and developing SPFs for ramp-freeway merge zones categorized as isolated, non-isolated and weave. For each of these three categories, data for the period 2007 to 2011 were collected at sites selected to ensure statewide geographical representation and coverage of the range of traffic volume and other variables in each category. Separate SPFs were developed for Total, fatal+injury (FI) and Property Damage Only (PDO) crashes.
Date: 2013
dc.title: Safety performance functions for freeway merge zones

Title: Sustainable stabilization of sulfate-bearing soils with expansive soil-rubber technology
Abstract: 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.
Date: 2013
dc.title: Sustainable stabilization of sulfate-bearing soils with expansive soil-rubber technology

Title: CDOT sign design manual
Abstract: This manual is a guidance to standardize CDOT sign layout practices. CDOT standards are based upon the Manual on Uniform Traffic Control Devices (MUTCD) and Standard Highway Signs Book. This manual is to be used in conjunction with the Standard Highway Signs (SHS) Design Guidelines. CDOT Sign Shop capabilities are also explained for guidance on special signing issues.
Date: 2013
dc.title: CDOT sign design manual, Colorado Department of Transportation sign design manual

Title: Colorado mileage-based user fee study
Abstract: Colorado could pursue fees based on actual travel as an alternative to the fuel tax. Revenues from mileage-based user fees (MBUF) would not vary based on fleet fuel consumption and would instead return revenue in proportion to use of the roadway network. Too many operational and technological questions remain unanswered, and must be tested and evaluated before the state would be ready to commit to a statewide implementation of this strategy.
Date: 2013
dc.title: Colorado mileage-based user fee study

Title: Development of estimation methodology for bicycle and pedestrian volumes based on existing counts
Abstract: This research project enables CDOT to answer the question of whether or not pedestrians and bicyclists are being adequately accommodated by establishing Colorado-specific methodologies for estimating bicycle and pedestrian volumes via a limited sample of existing counts.
Date: 2013
dc.title: Development of estimation methodology for bicycle and pedestrian volumes based on existing counts

Title: Construction cost forecast model : model documentation and technical notes
Abstract: This report contains the documentation and supporting technical notes for a statistical model that estimates changes in the price components of the Colorado Construction Cost Index. The model contains two specifications. In the first, the composite construction index is a function of the producer prices of inputs: oil, concrete, steel, labor and equipment. In the second, the composite construction index is a function of the price of oil, wages and nationwide demand for construction services. Implementation The model has been transferred to Colorado Department of Transportation (CDOT)'s economist, who will maintain and operate it to forecast price inflation in construction costs over a thirty-year period, in support of statewide planning and programming.
Date: 2013
dc.title: Construction cost forecast model : model documentation and technical notes

Title: Investigation into effective traffic noise abatement design solutions for mountain corridors
Abstract: Traffic noise abatement in mountain corridors can be difficult because traditional roadside barriers may be ineffective due to topography or may not fit the setting. This study examined current best practices from around the world to gather concepts for mitigating traffic noise in mountain corridors in Colorado. A literature review of prospective noise abatement actions found that noise barriers are the most effective direct noise abatement measure, although quieter pavements could have an important supporting role.
Date: 2013
dc.title: Investigation into effective traffic noise abatement design solutions for mountain corridors

Title: Recycled tires as coarse aggregate in concrete pavement mixtures
Abstract: The reuse potential of tire chips as coarse aggregates in pavement concrete was examined in this research by investigating the effects of low- and high-volume tire chips on fresh and hardened concrete properties. One concrete control mixture was designed, which well exceeds CDOT Class P concrete requirements.
Date: 2013
dc.title: Recycled tires as coarse aggregate in concrete pavement mixtures

Title: Final environmental impact statement and section 4(f) evaluation for I-25 improvements through Pueblo
Abstract: This Final Environmental Impact Statement (FEIS) and Section 4(f) evaluation describes the transportation and environmental impacts associated with proposed improvements to Interstate 25 (I-25) through the City of Pueblo, Colorado. The roadway in this section pre-dates the interstate system and is among the oldest segments of the interstate system in Colorado. This segment of I-25 contains structural and operational deficiencies. Two Build Alternatives are considered in the FEIS, including general purpose lanes on the existing alignment and general purpose lanes on a modified alignment. These two alternatives are compared to a No-Action scenario. The Modified I-25 Alternative has been identified as the Preferred Alternative.
Date: 2013
dc.title: Final environmental impact statement and section 4(f) evaluation for I-25 improvements through Pueblo, New Pueblo Freeway (Also called), I-25 improvements through Pueblo, Final environmental impact statement and section 4(f) evaluation for Interstate 25 improvements through Pueblo, Pueblo County, Colorado submitted pursuant to 42 USC 4332 (2)(c), 49 USC 303, &16 USC 460

Title: Performance of chip seals using local and minimally processed low traffic volume roadways
Abstract: Chip seals are used extensively by CDOT for extending pavement life. Chip seals utilizing locally available and minimally processed aggregates should be a more economical pavement preservation treatment than chip seals constructed with higher quality, more expensive aggregates. Low traffic roadways may not demand such materials to perform acceptably. After four winters and three summers service both experimental chip seals are performing well. It appears that locally available, minimally processed aggregates can be successfully applied as chip seal aggregate on low volume roadways.
Date: 2013
dc.title: Performance of chip seals using local and minimally processed low traffic volume roadways