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Unknown Foundation Determination for Scour

Description: This report describes a project to develop a global approach that would reduce the level of uncertainty associated with unknown foundations.
Date: April 2012
Creator: Briaud, Jean-Louis; Medina-Cetina, Zenon; Hurlebaus, Stefan; Everett, Mark; Tucker, Stacey; Yousefpour, Negin et al.

Alternative Methods of Flexible Base Compaction Acceptance

Description: "This report summarizes the concerns expressed with the current Texas Department of Transportation(TxDOT) methods, presents approaches some TxDOT districts have taken to overcome problems, and summarizes the current status of other agencies' efforts at mechanistic based acceptance for flexible base. Also this report presents results and findings from a full-scale compaction experiment."
Date: May 2012
Creator: Sebesta, Stephen; Taylor, Ross & Frazier, James

Positive Feedback: Exploring Current Approaches in Iterative Travel Demand Model Implementation

Description: This report looked at the current Texas Department of Transportation Travel Demand Model (TxDOT TDM) and found that they do not include any impedance or accessibility measures in the trip generation step and found that the best approach is to feed back the output from the traffic assignment step to the trip distribution step.
Date: January 2012
Creator: Reeder, Phillip; Bhat, Chandra & Hall, Kevin

Research and recommendations for a statewide sign retroreflectivity maintenance program

Description: "This report evaluated Texas Department of Transportation's (TxDOT) current sign retroreflectivity maintenance practices, assessed their effectiveness, and recommended statewide sign retroreflectivity maintenance practices that could be easily and effectively implemented to ensure that TxDOT would be in compliance with the new Manual on Uniform Traffic Control Devices (MUTCD) language related to minimum sign retroreflectivity."
Date: April 2012
Creator: Carlson, Paul J.; Higgins, Laura L. & Re, Jonathan M.

Evaluation, presentation and repair of microbial acid-produced attack of concrete

Description: This report evaluates the severity of the deterioration in bridges to determine if microbial induced deterioration (MID) is a significant contributor by visual inspection and a number of tests on twelve selected columns. This report also evaluates the effectiveness of suggested test procedures on identifying microbial attack on concrete and the integrity of deteriorated concrete due to the attack.
Date: October 2011
Creator: Hu, Jiong; Hahn, Dittmar; Rudzinski, Walter; Wang, Zhuo & Estrada, Luzelva

Evaluation of traffic control devices : year 3

Description: Report summarizing the research activities that were conducted between September 2010 and August 2011. The five primary activities were evaluating nighttime visibility along rural highways with bright signs, continuing the evaluation of lead-free thermoplastic pavement markings, evaluating contrast pavement marking layouts, continuing the evaluation of accelerated pavement marking test decks, and providing district support for hurricane evacuation routing.
Date: March 2012
Creator: Carlson, Paul J.; Pike, Adam M.; Miles, Jeff D.; Ullman, Brooke R. & Borchardt, Darrel W.

CAM Mix Design With Local Aggregates

Description: "This study provides revised mix design recommendations for crack attenuating mixtures (CAM) with local aggregates. The use of lower quality aggregates is cost beneficial but limits the application of these mixes in terms of reduced performance. Aggregate guidelines and aggregate quality criteria are provided to enhance the rutting and cracking performance of these mixes. The mix design recommendations as well as aggregate guidelines and quality criteria provided in the report are based on la… more
Date: October 2011
Creator: Smit, Andrè de Fortier; Prasad, Sivaram; Prozzi, Jorge Alberto & Tahmoressi, Maghsoud

Estimating Texas motor vehicle operating costs : final report

Description: "This report and its appendices summarize the findings of a 2-year extension to the TxDOT-sponsored study 0-5974 entitled "Estimating Texas Motor Vehicle Costs" undertaken by a Center for Transportation Research (CTR) team of mechanical engineers and economists at The University of Texas at Austin."
Date: November 2011
Creator: Matthews, Ronald; Seedah, Dan; Ates, Murat; Kim, Kyung Jin; Anderson, Garrett; Vaughn, James et al.

Implementing a project and portfolio management system for TxDOT project development

Description: "Beginning in the summer of 1999, Texas Department of Transportation (TxDOT) started developing the framework for implementing a sophisticated new system to manage its large and diverse portfolio of projects during their development phase. This was followed by the implementation itself for managing project schedules, project and portfolio resources and costs during their development cycle. This unique and challenging implementation across TxDOT encompassed all functional areas involved in the p… more
Date: October 2011
Creator: Khwaja, Nabeel

Strut-and-Tie Model Design Examples for Bridges

Description: A series of five detailed design examples feature the application of state-of-the-art strut-and-tie modeling (STM) design recommendations. Design components include: Five-Column Bent Cap of a Skewed Bridge, Cantilever Bent Cap, Inverted-T Straddle Bent Cap (Moment Frame), Inverted-T Straddle Bent Cap (Simply Supported), and Drilled-Shaft Footing.
Date: June 2012
Creator: Williams, Chris; Deschenes, Dean & Bayrak, Oguzhan

RTI Special Studies for TxDOT Administration in FY 2011

Description: Abstract: This research project was established by TxDOT's Research and Technology Implementation Office to address special studies required by the department's Administration during FY 2011. Three short-term, quick-turnaround tasks were completed and are documented.
Date: June 2012
Creator: Persad, Khali; Zhang, Zhanmin; Qazi, Abds; Harrison, Robert; Trevino, Manuel & Khwaja, Nabeel

Identification of priority rail projects for Texas: initial methodology/user manual and guidebook

Description: "This project developed a system of evaluative tools for the Texas Department of Transportation (TxDOT) to prioritize its investments in rail-related projects on a statewide basis. This work is meant to ensure that the limited available funding for rail projects is applied in the most beneficial and efficient manner and is focused upon addressing TxDOT's strategic goals. From the findings, researches recommend a transparent methodology for evaluating proposed rail projects and establishing an i… more
Date: February 2012
Creator: Morgan, Curtis Alan

Continuous prestressed concrete girder bridges. Volume 1, Literature review and preliminary designs

Description: "The Texas Department of Transportation (TxDOT) is currently designing typical highway bridge structures as simply supported using standard precast, pretension-ed girders. TxDOT is interested in developing additional economical design alternatives for longer span bridges, through the use of the continuous precast, pretension-ed concrete bridge structures that use spliced girder technology. The objectives of this portion of the study are to evaluate the current stat-of-the-art and practice relev… more
Date: October 2011
Creator: Mander, John B.; Parkar, Anagha S. & Hueste, Mary Beth D.

Pavement repair strategies for selected distresses in FM roadways

Description: "Expansive soil is considered one of the most common causes of pavement distresses in FM roadways. Depending upon the moisture level, expansive soils will experience changes in volume due to moisture fluctuations from seasonal variations. The objective of this research was to evaluate existing repair projects on selected FM roadways. Those roadways experienced failures in the form of fatigue and rutting in the wheel path, and longitudinal (faulted) cracking including edge cracking. The causes … more
Date: June 2012
Creator: Dessouky, Samer; Oh, Jeong Ho; Yang, Mijia; Ilias, Mohammad; Lee, Sang Ick; Freeman, Tom et al.

Developing a mixture design specification for flexible base construction

Description: "In the Texas Department of Transportation (TxDOT), flexible base producers typically generate large stockpiles of material exclusively for TxDOT projects. This large "state-only" inventory often maintained by producers, along with time requirements for testing and reduced manpower within TxDOT offices, resulted in this project's investigation into a mixture-design specification for flexible base. The goals of this project are to develop a flexible base specification that reduces TxDOT's burden… more
Date: October 2011
Creator: Epps, Jon A.; Sebesta, Stephen; Sahin, Hakan; Button, Joe; Luo, Rong & Lytton, Robert

San Marcos City Park archaeological survey, Hays County, Texas

Description: "At the request of the City of San Marcos, the Center for Archaeological Studies (CAS) conducted archaeological testing of the playground in San Marcos City Park under Texas Historical Commission Antiquities Permit No. 2731. The testing was conducted on October 26 and 29, 2001, to determine whether scheduled renovation of the playground would disturb potentially intact prehistoric or historic cultural material. Shovel testing revealed possibly intact subsurface deposits below approximately 50 c… more
Date: 2002
Creator: Bousman, C. Britt.; Nickels, David L. & Gibson, Connie Thompson.
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