Search results | Colorado State Publications Digital Repository

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: 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: 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: 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: 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: 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: 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: 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: Development of risk-based decision methodology for facility design
Abstract: This report develops a framework for organizing risk-based decisions about design, maintenance, and operation for the Colorado Department of Transportation (CDOT) applying to various types of facilities. It also provides illustrative examples for the use of the proposed framework. CDOT has an opportunity to be a national leader in assessing risks, vulnerabilities, consequences and outcomes through the implementation of a risk-based framework for facility design, operations and maintenance.
Date: 2014
dc.title: Development of risk-based decision methodology for facility design

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

Title: CDOT thermal mapping report
Abstract: Thermal Mapping surveys were carried out on approximately 1000 miles of the Colorado Department of Transportations (CDOTs) roads. The purpose of these surveys was to identify road surface variations across the network to determine whether forecast Thermal Maps or the data from the surveys would be useful to decision-makers in the CDOT regions.
Date: 2014
dc.title: CDOT thermal mapping report

Title: Evaluation of bridge deck sealers
Abstract: This study focuses on the evaluation of bridge deck sealers commonly used on highway bridge decks and their relative performance.
Date: 2014
dc.title: Evaluation of bridge deck sealers

Title: Years to first rehabilitation of superpave hot mix asphalt
Abstract: The purpose of this study was to quantify the initial design life of a roadways pavement prior to rehabilitation and provide specific performance information through the analysis of pavement management data and historical experience. The analyzed data may be used to estimate the initial life of a pavement which can be incorporated into the LCCA within CDOTs M-E Pavement Design Guide. It will also provide guidance to CDOT and subcontractors in determining the cost-effectiveness of different pavement designs, construction and maintenance costs.
Date: 2014
dc.title: Years to first rehabilitation of superpave hot mix asphalt

Title: Accelerated bridge construction utilizing precast pier caps on state highway 69 over Turkey Creek, Huerfano County, CO
Abstract: The purpose of this report is to document Accelerated Bridge Construction (ABC) techniques on IBRD (Innovative Bridge Research and Development) project 102470 for the construction of Bridge N-16-Q on State Highway 69 over Turkey Creek. The project demonstrated faster pier erection by utilizing precast pier caps to eliminate concrete cure time from the critical path in the construction schedule.
Date: 2014
dc.title: Accelerated bridge construction utilizing precast pier caps on state highway 69 over Turkey Creek, Huerfano County, CO