Search results

Title: Internal curing of high performance concrete using lightweight aggregates and other techniques
Abstract: Internally cured concrete has been rapidly emerging over the last decade as an effective way to improve the performance of concrete. Internal curing (IC) holds promise for producing concrete with an increased resistance to early-age cracking and enhanced durability. It is a simple and effective way to cure concrete.
Date: 2014
dc.title: Internal curing of high performance concrete using lightweight aggregates and other techniques

Title: In-place voids monitoring of hot mix asphalt pavements
Date: 2002
dc.title: In-place voids monitoring of hot mix asphalt pavements

Title: Full closure strategic analysis
Abstract: The full closure strategic analysis was conducted to create a decision process whereby full roadway closures for construction and maintenance activities can be evaluated and approved or denied by CDOT Traffic personnel. The study reviewed current full closure practices in Colorado and throughout the country, gathered stakeholder input, and employed an iterative development process to reach a systematic decision tool that can be applied to judging the merits of full closure scenarios. A number of case studies were created to more fully understand the methodology and adjust the tool to best match real-world scenarios. Project deliverables include a technical report and a series of electronic forms that can be used by CDOT to work through the process.
Date: 2014
dc.title: Full closure strategic analysis, CDOT full closure strategic analysis

Title: Evaluation of the FHWA traffic noise model, TNM, for highway traffic noise prediction in the state of Colorado
Abstract: In 2002, CDOT undertook this study in an effort to better understand the complexities of the Federal Highway Administration's new Traffic Noise Model (TNM). The research involved three analysis.
Date: 2006
dc.title: Evaluation of the FHWA traffic noise model, TNM, for highway traffic noise prediction in the state of Colorado

Title: Design of mechanically stabilized earth wall connections and end of walls subjected to seismic loads
Abstract: A report that examines the impact that new AASHTO design requirements may have on connection details in mechanically stabilized earth walls.
Date: 2014
dc.title: Design of mechanically stabilized earth wall connections and end of walls subjected to seismic loads

Title: CDOT rapid debris removal research project
Abstract: Highway debris represents a traffic safety problem that requires a prompt response from state or local transportation agencies. The most common practice for debris removal currently is for agency personnel to leave their vehicles and remove the debris by hand in the case of large debris (tires, lumber, freight loss, rock fall) or to sweep traveled lanes shoulders, or intersections in the case of crashes, mechanical failure, or embankment erosion. This exposes agency workers to safety risks, especially on high-speed and/or high-volume roadways. Currently, the Colorado Department of Transportation (CDOT) has no widely distributed formal guidelines for safely and effectively removing debris from the roadway.
Date: 2014
dc.title: CDOT rapid debris removal research project

Title: Development of steel design details and selection criteria for innovative and cost-effective steel bridges in Colorado
Abstract: In recent years, prestressed concrete bridges have dominated the bridge type selection processes in Colorado. This can be attributed to a lack of steel mills combined with a strong presence of precast fabricators in the region. In addition, a lack of readily available economical and innovative procedures to design and construct steel bridges has hindered the industry in certain areas such as Colorado. During this research it was identified that designing steel girders as simply supported for the non composite dead loads and continuous for composite dead loads and live loads would provide economy. A preliminary girder selection software was created using this design procedure. The software takes user inputted data, such as span length, width, number of girders along with various other design inputs, and displays the lightest wide flange beam size that would support the loads using AASHTO LRFD Design Specifications. Using the girder selection software, design charts and tables were created to outline structural steel weight to span length and number of girders. The design charts will aid the bridge type selection process by giving designers an accurate measurement of minimum steel requirements for numerous one, two, and three span steel bridges.
Date: 2008
dc.title: , Development of steel design details and selection criteria for cost-effective and and innovative steel bridges in Colorado, , ,

Title: Statewide economic benefits of transportation investments
Date: 2007
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Title: Tire/pavement and environmental traffic noise research study
Date: 2008
dc.title: , , ,

Title: Improving the performance of roadside vegetation
Abstract: The purpose of this study was to determine the impact of a magnesium chloride-based deicer, a sodium chloride-based deicer, and the major salts contained in these deicers on seed germination and seedling growth and development of fifteen species of grasses and forbs native to Colorado. Seven of the fifteen species performed well at the low and medium concentrations of the salts and solutions; these are plants that can likely germinate in roadside areas.
Date: 2011
dc.title: , , ,

Title: Factors impacting the health of roadside vegetation
Abstract: Roadside vegetation is exposed to a variety of biotic and abiotic stresses that can impact plant health. Drought, pollution, disease, insects, lack of nutrients, and roadbed management practices may potentially act alone or synergistically to adversely affect plants in proximity to the roadside. To date, little published research documents the impacts of certain deicers on vegetation in relationship to other potential stresses. This study provides an ecological impact assessment of factors affecting the health of roadside vegetation in the state of Colorado including potential biotic and abiotic plant stressors and deicer applications.
Date: 2007
dc.title: , , ,

Title: A comparison of freeway and parallel major arterial corridors : a study of safety patterns in the Denver Metropolitan area
Abstract: This research project observes and analyzes traffic and accident history on Colorado State Highways and parallel arterial roads within a major southeast section of the Denver Metropolitan Area. The project focuses on the freeway section of C-470 between S. Santa Fe Drive and I-25 and comparisons with I-25 and the corresponding parallel east-west regional arterial corridors.
Date: 2015
dc.title: A comparison of freeway and parallel major arterial corridors : a study of safety patterns in the Denver Metropolitan area

Title: Monitoring wildlife-vehicle collisions : analysis and cost-benefit of escape ramps for deer and elk on U.S. Highway 550
Abstract: Wildlife fencing along highways can lower wildlife-vehicle collision rates by excluding animals from the road right-of-way. Still, animals can breach fencing and end up trapped within the fencing along the highway right-of-way, exposing wildlife and motorists to the risk of collision. Wildlife escape ramps are designed to allow animals safe passage out of the right-of-way. Few recommendations exist on effective design of escape ramps and monitoring data are limited.
Date: 2015
dc.title: Monitoring wildlife-vehicle collisions : analysis and cost-benefit of escape ramps for deer and elk on U.S. Highway 550

Title: Snow route optimization
Abstract: Route optimization is a method of creating a set of winter highway treatment routes to meet a range of targets, including service level improvements, resource reallocation and changes to overriding constraints. These routes will allow the operator clear the pavement in a timely and efficient manner, reducing wastage and utilizing resources to their best effect.
Date: 2016
dc.title: Snow route optimization, Colorado Department of Transportation snow route optimization research report

Title: Performance of thin bonded epoxy overlays on asphalt and concrete bridge deck surfaces
Abstract: This study is the evaluation of two thin bonded epoxy overlays. These two products were compared on the basis of physical properties, including mean texture depth, surface friction, bond strength, ability to stop chloride intrusion, and anti-icing properties, as well as traffic safety and cost. Both overlays worked as intended when they were initially applied on the bridge decks. Mean texture depth and friction testing have shown that they both provide a durable wearing surface with good traction.
Date: 2014
dc.title: Performance of thin bonded epoxy overlays on asphalt and concrete bridge deck surfaces

Title: Evaluation of guardrail embedded lighting system in Trinidad, Colorado
Abstract: This report provides information on the design considerations of the embedded highway lighting design on Interstate-25 in Trinidad, Colorado, in terms of visibility. The information is based on visibility characterizations of small targets using luminance, illuminance, and contrast calculations as well as participant input on the detectability of small targets.
Date: 2014
dc.title: Evaluation of guardrail embedded lighting system in Trinidad, Colorado

Title: Use of waste tires, crumb rubber, on Colorado highways
Abstract: The goal of this research project is to evaluate the performance of the crumb rubber test sections compared with the conventional control section and depending on performance, develop Colorado-specific materials and construction specifications for ground tire modified asphalt pavements. Also, the research project aims to develop guidelines and best management practices for the construction of ground tire modified asphalt pavements. Transverse cracking began in the rubber modified sections after 22 months of service and longitudinal cracking began after 29 months. The control sections have no transverse cracking to date with longitudinal cracking beginning to appear after 56 months.
Date: 2014
dc.title: Use of waste tires, crumb rubber, on Colorado highways

Title: Assessment and placement of living snow fences to reduce highway maintenance costs and improve safety (living snow fences) study no: 047-10
Abstract: Living snow fences (LSF) are designed plantings of trees and/or shrubs and native grasses along highways, roads and ditches that create a vegetative buffer that traps and controls blowing and drifting snow. These strategically placed fences have been shown to be cost effective in reducing highway maintenance associated with blowing and drifting snow conditions.
Date: 2015
dc.title: Assessment and placement of living snow fences to reduce highway maintenance costs and improve safety (living snow fences) study no: 047-10

Title: Benefit-cost analysis of CDOT fixed automated spray technology (FAST) systems
Abstract: The study found that FAST systems have demonstrated the potential to reduce the number of crashes and reduce the cost of winter maintenance activities, if sited at appropriate locations (e.g., high-traffic-volume ice-prone ramps). However, improved installation techniques and involvement of maintenance crews during FAST installation are necessary to further increase the cost-effectiveness of a FAST system deployment. Extra effort will be made in sharing the information gained from this research study by focusing on CDOT personnel involved in planning, design, construction, operation and maintenance of FAST systems.
Date: 2014
dc.title: Benefit-cost analysis of CDOT fixed automated spray technology (FAST) systems

Title: Colorado Department of Transportation hot mix asphalt crack sealing and filling best practices guidelines
Abstract: Crack sealing and filling on hot mix asphalt (HMA) pavements are cost-effective pavement preservation techniques that improve pavement performance and extend the life of existing pavements. If performed in a timely and effective manner, crack sealing can extend the life of HMA pavements. CDOT sponsored this study to update its procedures and guidelines for crack sealing and filling of HMA pavements. The draft Guidelines included in this report reflect CDOT experience, current state-of-the-practice, and the most recent research findings, and address where and when to perform crack sealing and filling, material selection, installation methods, construction inspection, and follow-up evaluation.
Date: 2014
dc.title: Colorado Department of Transportation hot mix asphalt crack sealing and filling best practices guidelines

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