UNT Libraries Government Documents Department - Browse

ABOUT BROWSE FEED

Predicting damage in concrete due to expansive aggregates : modeling to enable sustainable material design

Description: "A poroelastic model is developed that can predict stress and strain distributions and, thus, ostensibly damage likelihood in concrete under freezing conditions caused by aggregates with undesirable combinations of geometry and constitutive properties.Sensitivity of the stress distributions to the aggregate and matrix constitutive parameters are assessed to allow improved concrete design."
Date: April 2012
Creator: Grasley, Zachary Charles & Rahman, Syeda
Item Type: Report

The design of a comprehensive microsimulator of household vehicle fleet composition, utilization, and evolution

Description: "The report describes a comprehensive vehicle fleet composition, utilization, and evolution simulator that can be used to forecast household vehicle ownership and mileage by type of vehicle over time. The components of the simulator are developed in this research effort using detailed revealed and stated preference data on household vehicle fleet composition, utilization, and planned transactions collected for a large sample of households in California. Results of the model development effort show that the simulator holds promise as a tool for simulating vehicular choice processes in the context of activity-based travel microsimulation model systems."
Date: January 2012
Creator: Paleti, Rajesh.; Eluru, Naveen; Bhat, R. Chandra; Pendyala, Ram M.; Adler, Thomas J. & Goulias, Konstadinos G.
Item Type: Report

Laboratory evaluation of friction loss and compactability of asphalt mixtures

Description: "This study aimed to develop prediction models for friction loss and laboratory compaction of asphalt mixtures. In addition, the study evaluated the effect of compaction level and compaction method of skid resistance and the internal structure of asphalt mixtures."
Date: April 2012
Creator: Kassem, Emad Abdel-Rahman; Masad, Eyad; Awed, Ahmed & Little, Dallas
Item Type: Report

Compendium of student papers: 2011 undergraduate transportation scholars program.

Description: "This report is a compilation of research papers written by students participating in the 2011 Undergraduate Transportation Scholars Program. The papers in this compendium report on the following topics, respectively: 1) evaluating the impact of nighttime work zone lighting characteristics n motorists; 2) late night roadway visibility; 3) investigation of the use and pricing of the I-15 express lanes in San Diego; 4) intercity passenger rail access to airports: a case study at the Milwaukee airport; 5) development of a background complexity assessment tool; 6)identifying pavement preservation treatments suitable for performance-related specifications; and 7)arsenic content and retro-reflectivity of glass beads used in pavement markings."
Date: May 2012
Creator: Desorcie, Felicia; Jian, Ruoxin; Kelly, Pete; Larson, Shawn; Rasulo, Marcus; Rivera, Joshua et al.
Item Type: Report

Performance measures for metropolitan planning organizations

Description: "The aim of this project is to consolidate available knowledge and provide guidance to transportation agencies, specifically MPOs, to help them incorporate performance measurement relating to transportation planning and operations. This research includes a survey of agency practices and agency needs, development of guidance on effective performance measurement and allied issues of strategic planning, goal setting, and data collection."
Date: April 2012
Creator: Moore, Devin; Ramni, Tara; Norboge, Nicolas & Turnbull, Katherine
Item Type: Report

Getting the parking right for transit-oriented development

Description: "The main objective of this study is to report the state-of-the-knowledge on parking regulations and practice influencing the planning, design, and implementation of TOD. The report first offers a narrative review of the published works on TOD-Parking. Based on the review findings it then presents a matrix of best parking practices for TOD."
Date: March 2012
Creator: Zhang, Ming.; Mulholland, Katie; Zhang, Jane & Gomez-Sanchez, Ana J.
Item Type: Report

Fracture properties and fatigue cracking resistance of asphalt binders

Description: "The main objective of this study was to evaluate the inherent fatigue cracking resistance of asphalt binders in the form of a matrix with rigid particle inclusions. The underlying rational for this approach was to subject the binders to a state of stress that is similar to the one in a full asphalt mixture."
Date: March 2012
Creator: Bhasin, Amit.; Izadi, Anoosha & Motamed, Arash
Item Type: Report

Potential connected vehicle applications to enhance mobility, safety, and environmental security

Description: "Researchers first conducted a comprehensive review of the state-of-the-art connected-vehicle research and technologies. Once researchers had a thorough understanding of the technology, they focused on selecting and developing the near-term practical applications that use connected vehicle technology. The research team then sought expert opinions from the Texas Transportation Institute working group during two brainstorming sessions, which produced two lists of potential applications and prioritized the applications based on deployment feasibility. In particular, a total of five applications were selected for development of the full concept of operations, including two in safety, two in mobility, and one in environmental security. These applications address various problems, including wrong-way driving and unprotected-grade-crossing crashes (safety): work-zone merge efficiency and safety, and freeway speed harmonization (mobility): and slippery pavement-related crashes (environmental security)."
Date: February 2012
Creator: Balke, Kevin N.; Songchitruksa, Praprut. & Zeng, Xiaosi
Item Type: Report

Development of warrants for installation of dual right-turn lanes at signalized intersections

Description: "Right-turn lanes provide space for the deceleration and storage of right-turn vehicle, and separate turning vehicles from through movements. Dual right-turn lanes are increasingly used at urban intersections primarily for two reason: (1) to accommodate high right-turn demands and avoid turn-pocket overflows, and/or (2) to prevent right-turn vehicles that exit from a nearby upstream freeway off-ramp (on the left of the roadway) from abruptly changing too many lanes toward the right-turn lane at intersection."
Date: April 2012
Creator: Chen, Xiaoming & Li, Da
Item Type: Report

The economic efficiency of allowing longer combination vehicles in Texas

Description: "This paper shows the economic efficiency of allowing longer combination vehicles in Texas. First, an overview of the truck size and weight policies is explained, with an emphasis on those that affect Texas. Next, LCV operations in other countries are described. Then, an LCV scenario for Texas is chosen, with specific routes and vehicle types. Operational costs for these vehicles are calculated on a cost per mile and cost per ton (or cubic yard) mile. The LCV scenario and the current truck base case are analyzed to find the number of truck trips, the number of mile, and the cost per mile for the chosen routes. These are then compared to estimate the change if LCVs were allowed in Texas."
Date: August 2011
Creator: Walton, C. Michael. & Bienkowski, Bridget N.
Item Type: Report

Prioritization of highway maintenance functions using multi-attribute decision making with fuzzy pairwise comparison

Description: "As is the case for most of the Departments of Transportation in the U.S., the Texas Department of Transportation has been experiencing fluctuations of budget for maintaining and preserving its highway infrastructure over the recent years. If the maintenance budget shortfall lasts for an extended period of time, the condition of the highway network would be harmed directly or indirectly since some maintenance work would be deferred or canceled. Thus, in order to control and minimize the risk caused by maintenance budget reductions, it is important for highway agencies to adjust their maintenance and rehabilitation policies to accommodate budget fluctuations. This thesis presents a methodological framework that helps highway agencies quantify the risks to highway networks, and revise the highway routine maintenance work plans to minimize the impact of budget fluctuations. The proposed methodology aims to assist highway agencies in prioritizing and selecting maintenance functions according to the risk of not performing a specific maintenance activity. Also, this methodology considers the subjective nature of decision makers' assessments, allowing different levels of confidence and different attitudes toward risk to be captured as the uncertainty and imprecision involved in the decision making process. In the case study, the proposed methodology is tested with a set of data obtained from the Texas Department of Transportation. The result is compared with the outcome obtained from the crisp Analytical Hierarchy Process using the same set of data. The outcomes from the two methodologies are very close, validating the effectiveness of prioritizing highway maintenance functions using Multi-Attribute Analysis with Fuzzy Pairwise Comparison."
Date: September 2011
Creator: Zhang, Zhanmin & Liu, Wenxing
Item Type: Report

Predicting the incremental effects on transit ridership due to Bus-On-Shoulder operations

Description: "Bus-On-Shoulder (BOS) operations are an extremely effective method for increasing the quality of a bus service; allowing for a bus to use a freeway shoulder as a bypass lane not only decreases bus travel time but also increases the bus service's overall performance. BOS has also been found to increase bus ridership. The modern BOS system began in the Minneapolis-Saint Paul area almost 20 years ago. Using the extensive data available from Minneapolis-Saint Paul, ridership changes due to BOS operations were explored. The data showed that with 90% confidence, ridership will increase by at least 4.5% and as much as 14.3%. This paper also explores how the citizens of Austin, Texas would respond to a BOS operation on local freeways. A stated preference survey was administered to a sample of Austin commuters. It was determined that potential riders would desire a time savings of 7 or more minutes. Typically it is challenging for persons to accurately predict time savings, therefore it was concluded that for a BOS operation to be successful it was necessary for a there to be a perceived time savings."
Date: August 2010
Creator: Machemehl, Randy B. & Pappas, Elani
Item Type: Report

Use of Micro Unmanned Aerial Vehicles for roadside condition assessment

Description: "Micro Unmanned Aerial Vehicles (MUAVs) that are equipped with digital imaging systems and global positioning systems provide a potential opportunity for improving the effectiveness and safety of roadside condition and inventory surveys. This study provides an assessment of the effectiveness of MUAVs as a tool for collecting condition data for roadside infrastructure assets using three field experiments."
Date: December 2010
Creator: Gharaibeh, Nasir G. & Hart, William Scott
Item Type: Report

A road pricing methodology for infrastructure cost recovery

Description: "The purpose of this research is to provide a theoretical framework for future commercial vehicle user-changing using real-time vehicle weight and configuration information collected using weigh-in-motion (WIM) systems."
Date: August 2010
Creator: Walton, C. Michael & Conway, Alison J.
Item Type: Report

The light-duty-vehicle fleet's evolution: anticipating Plug-In-Electric-Vehicle adoption and greenhouse gas emissions across the U.S. fleet

Description: "The first part of this report relies on stated and revealed preference survey results across a sample of U.S. households to first ascertain vehicle acquisition, disposal, and use patterns, and then simulate these for a synthetic population over time. The second part of this report relies on data from the U.S. Consumer Expenditure Survey (CEX) to estimate the welfare impacts of carbon taxes and household-level capping of emission (with carbon-credit trading allowed)."
Date: May 2011
Creator: Kockelman, Kara; Musti, Sashank & Paul, Binny
Item Type: Report

Compendium of student papers: 2010 undergraduate transportation scholars program

Description: "This report is a compilation of research papers written by students participating in the 2010 Undergraduate Transportation Scholars Program. The 10-week summer program, now in its 20th year, provides undergraduate students in Civil Engineering the opportunity to learn about transportation engineering through participating in sponsored transportation research projects. The program design allows students to interact directly with a Texas A&M University faculty member or Texas Transportation Institute researcher in developing a research proposal, conducting valid research, and documenting the research results through oral presentations and research papers. The papers in this compendium report on the following topics, respectively: 1) estimating carriers/truckers value of time due to congestion; 2) evaluating retroreflectivity measurement techniques for profiled and rumble stripe pavement markings; 3) analyzing retroreflectivity and color degradation in sign sheeting; 4) evaluating the effectiveness of LED enhanced stop paddles for school crossing guard use; 5) incorporating freight value into the Urban Mobility Report; 6) evaluating ASTM Standard Test Method E2177, retroreflectivity of pavement markings in a condition of wetness; 7) calibrating pavement performance prediction models; and 8) evaluating the effects of concrete curing compounds on hydration."
Date: June 2011
Creator: Hawkins, H. Gene; Almy, Isaac; Ballard, Lance; Brimley, Bradford; Huff, William; Larson, Gregory et al.
Item Type: Report

Designing Fine Aggregate Mixtures to evaluate fatigue crack growth in asphalt mixtures

Description: "Fatigue cracking is a significant form of pavement distress in flexible pavements. The properties of the sand-asphalt mortars or fine aggregate matrix (FAM) can be used to characterize the evolution of fatigue crack growth and self-healing in asphalt mixtures. This study compares the internal microstructure of the mortar within a full asphalt mixture to the internal microstructure of the FAM specimen. This study also conducts a limited evaluation of the influence of mixture properties and methods of compaction on the engineering properties of the FAM specimens. The results from this study, although limited in number, indicate that in most cases the SGC compacted FAM specimen had a microstructure that most closely resembled the microstructure of the mortar within a full asphalt mixture. Another finding from this study was that, at a given level of damage, the healing characteristic of the three different types of FAM mixes was not significantly different. This indicates that the healing rate is mostly dictated by the type of binder and not significantly influenced by the gradation or binder content, as long as the volumetric distribution of the mastic was the same. In other words, the inherent healing characteristics of the asphalt binder play a more significant role relative to other properties (e.g. volumetrics) in the overall fatigue cracking resistance of the asphalt mixture."
Date: April 2001
Creator: Bhasin, Amit; Motamed, Arash & Izadi, Anoosha
Item Type: Report

How fast is a fast train? : comparing attitudes and preferences for improved passenger rail service among urban areas in the South Central high-speed rail corridor

Description: "Using data from an Internet-based survey of residents in three communities in Central Texas-Waco, Temple, and Hillsboro-this research project examined the potential impacts of new intercity passenger rail service on small-or medium-sized communities located in the intermediate area between two larger urban areas that form the endpoints of a federally designated intercity high-speed rail corridor."
Date: December 2011
Creator: Morgan, Curtis Alan & Sperry, Benjamin R.
Item Type: Report

Investigate existing Non-Intrusive Inspection (NII) technologies for port cargo inspections

Description: "The goal of this research was to identify the most effective and efficient combination of NII technologies for inspecting cargo arriving at U.S. ports. For this purpose, a discrete-event simulation model was developed to simulate the cargo inspection procedure. By simulating the operations of different combinations of NII technologies, the effectiveness and efficiency of the various combinations were evaluated."
Date: September 2011
Creator: Salehi, Yasamin & Wang, Yubian
Item Type: Report