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Application guide and specifications for geotextiles in roadway applications

Description: Abstract: "Geotextiles, one among the different geosynthetic products, can be used for a number of functions or applications in pavement design. The benefits of using geotextiles in pavements and other transportation applications have triggered a proliferation of products. While this abundance of new products has led to reduction in costs, it has also made it difficult for TxDOT personnel to choose appropriate products based on their engineering properties. Consequently, this report provides the basis for (i) guidelines for proper use and selection of geotextiles in pavements, (ii) material specifications for geotextiles in pavement applications, and (iii) draft construction specifications."
Date: February 2012
Creator: Zornberg, Jorge G. & Thompson, Nathan
Item Type: Report

Assessing the environmental justice impacts of toll road projects

Description: "The objective of this study was to extend the work that was conducted under TxDOT Research Project 0-5208 by (a) reviewing the ability of available tools and analysis techniques to quantify and qualitatively describe the (environmental justice) EJ impacts associated with toll road projects and toll road systems through an evaluation of state-of-the-practice applications, and (b) recommending a suitable approach to assess the EJ impacts of toll roads and toll road systems on EJ communities."
Date: October 2010
Creator: Prozzi, Jolanda; Carroll, Lindsey; Loftus-Otway, Lisa Dawn; Bhat, Chandra; Paleti, Rajesh & McCray, Talia M.
Item Type: Report

Binder Rheology and Performance in Warm Mix Asphalt : Interim Report

Description: This report presents the preliminary findings from a study conducted to investigate the influence of chemical warm mix asphalt (WMA) additives and reduced aging on the viscosity, stiffness, susceptibility to permanent deformation, fracture resistance, and thermal cracking resistance of asphalt binders.
Date: August 2012
Creator: Arega, Zelalem & Bhasin, Amit
Item Type: Report

Comparison of hot rubber crack sealants to emulsified asphalt crack sealants (first report of a three-year study)

Description: "This report presents the results, findings, conclusions, and recommendations based on the surveys, lab tests, and information collected on the test sections for the first year of a 3 year study. This project is intended to compare the cost-effectiveness, ease and safety of installation, performance, and life-cycle cost for hot rubber asphalt crack sealant, cold pout asphalt emulsion crack sealant, and cold pour asphalt emulsion joint sealant."
Date: August 2004
Creator: Yildirim, Yetkin; Solaimanian, Mansour & Kennedy, Thomas W.
Item Type: Report

Design and application of accessible land-use modeling tools for Texas regions

Description: "This report consists of two parts. The first summarizes key details of the Suitability Analysis (SA) model, while the second illustrates the implementation details of the Gravity Land-Use Model (G-LUM). Both modeling approaches have been applied to the Austing region of Texas, but for different case study examples."
Date: August 2010
Creator: Kockelman, Kara; Anjomani, Ardeshir; Paul, Binny M.; Nostikasai, Dian; Tayyebi, Ali & Kharel, Gehandra
Item Type: Report

Equipment replacement optimization

Description: "The objective of the Texas Department of Transportation (TxDOT) Research Project 7-4941 is to; determine the best optimization methodology; evaluate commercial fleet management systems; develop the model if this cost-effective relative to purchasing a commercial model; and validate the new model as needed using data available on TxDOT's current fleet."
Date: October 2011
Creator: Fan, Wei; Brown, Leonard; Patterson, Casey; Winkler, Mike; Schminkey, Justin; Western, Kevin et al.
Item Type: Report

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.
Item Type: Report

Experimental results on soil-geosynthetic interaction stiffness

Description: This report summarizes small pullout test results conducted as par of Texas Department of Transportation (TxDOT) Project 5-4829 to assess the performance of a newly developed small pullout box as well as the associated K SGI model.
Date: February 2012
Creator: Zornberg, Jorge G.; Ferreira, J. A. Z. & Roodi, G. H.
Item Type: Report

Experimental Results on Soil-Geosynthetic Interaction Stiffness

Description: This report summarizes small pullout test results conducted as par of Texas Department of Transportation (TxDOT) Project 5-4829 to assess the performance of a newly developed small pullout box as well as the associated K SGI model.
Date: February 2012
Creator: Zornberg, Jorge G.; Ferreira, J. A. Z. & Roodi, G. H.
Item Type: Report

Fatigue life of steel base plate to pole connections for traffic structures

Description: "This is a final report of an extensive experimental and analytical examination of the fatigue behavior of the welded end connection used on high-mast light structures and traffic signal masts. The weld details commonly used for these connections produce very poor fatigue performance. Their performance is a function of base plate stiffness, weld type and geometry, and number of anchor bolts. Recommended connections and their corresponding fatigue strength are given as well as recommended fabrication and welding specifications."
Date: January 2011
Creator: Stam, Andrew Philip; Frank, Karl H.; Stern, A. P.; Anderson, T. H. & Richman, N. B.
Item Type: Report

Geosynthetic-reinforced unbound base courses: quantification of the reinforcement benefits

Description: "As part of Research Project 0-4829, a new testing device was developed and a monitoring program was initiated to evaluate the performance of geosynthetics used as reinforcement for unbound base courses. This implementation involves the use of the new testing device and procedures developed by the 0-4829 research project. Specifically, the testing involves a modified pullout device for characterization of the confined stiffness in geosynthetic reinforcements. The project also provides continued monitoring of 32 experimental test sections constructed on FM2 (Bryan District) for the purposes of correlating field performance with material characterization. The experimental component of this implementation project was accomplished by testing four different geosynthetic reinforcement products in order to verify the draft specifications recommended by project 0-4829. The field component of this implementation project involved continued condition survey, moisture monitoring, falling weight deflectometer (FWD) testing, and weather data gathering in order to establish the threshold of the proposed parameter in the new specification based on field performance."
Date: February 2012
Creator: Zornberg, Jorge G.; Ferreira, J.A.Z.; Gupta, R.; Joshi, R.V. & Roodi, G. H.
Item Type: Report

Guidance for erection and construction of curved I-girder bridges

Description: "This report summarizes the methods, results, and recommendations from a research investigation on the behavior of horizontally curved girders during construction. This information provides guidance on critical issues that bridge engineers face when designing curved steel plate I-girders."
Date: May 2010
Creator: Stith, Jason; Schuh, Andrew; Farris, Jamie; Petruzzi, Brian; Helwig, Todd; Williamson, Eric et al.
Item Type: Report

Guidance on extracting value from Texas Department of Transportation's land holdings

Description: "In this report the Center of Transportation Research at The University of Texas at Austin undertook a comprehensive research study to identify and determine when, where, and under what circumstances Texas Department of Transportation (TxDOT) should pursue the implementation of Value Extraction Applications (VEA), and how to effectively recognize and involve key stakeholders."
Date: July 2012
Creator: Prozzi, Jolanda; Paes, Thiago; Loftus-Otway, Lisa & Caldas, Carlos
Item Type: Report

Impacts of energy developments on the Texas Transportation System infrastructure

Description: "Texas energy sector has a critical impact-historically and currently-on both the state economy and the Texas transportation system. The stat's various transportation modes, including rail, highways, pipelines, and ports, form a system that supports the energy sector in a number of ways."
Date: October 2011
Creator: Prozzi, Jolanda; Grebenschikov, Sergey; Banerjee, Ambarish & Prozzi, Jorge Alberto
Item Type: Report

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 project development phase. It was successfully completed by overcoming technical, technological, and cultural challenges inherent with any implementation of this scale and magnitude."
Date: October 2011
Creator: Khwaja, Nabeel
Item Type: Report

Implementing a project and portfolio management system for TxDOT project development

Description: "Beginning in the summer of 2099, Texas Department of Transportation (TxDOT) started developing the framework for implementing a sophisticated new system to manage its large and divers 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 project development phase. It was successfully completed by overcoming technical, technological, and cultural challenges inherent with any implementation of this scale and magnitude."
Date: October 2011
Creator: Khwaja, Nabeel
Item Type: Report

Laboratory evaluation of influence of operational tolerance (acceptance criterion) on performance of Hot-Mix Asphalt Concrete

Description: The objective of the study was to determine the effects of variability in key mix design factors, such as asphalt content, gradation, and density, on the laboratory performance of different hot-mix asphalt samples that were mixed and compacted in the laboratory. Variability was kept within specified limits by the allowable operational tolerances, and performance was addressed through the evaluation of the results obtained from volumetric properties and laboratory tests, such as flexural fatigue test, Hamburg wheel-tracking test, and overlay tester. A series of statistical analyses was conducted to develop relationships between the key mix design factors and the observed laboratory performances of each type of mixture. From the analysis, the effects of the main variables on the results of the performance tests used in this study were found. Finally, a statistically-based sensitivity analysis was conducted to reveal the relationship between different tolerance levels and mixture performance for the individual mixtures types.
Date: June 2010
Creator: Vazquez, Christian G.; Aguiar-Moya, José Pablo; Smit, Andre de F. & Prozzi, Jorge Alberto
Item Type: Report

Literature review of current practices in dealing with fluctuations of maintenance budgets

Description: "A literature review was conducted to investigate current budget cutting strategies used in routine roadway maintenance planning, including methods and techniques that are employed by other state and international transportation organizations (DOT's). Methods that quantify impact and increased risk factors from the reduction of routine maintenance activities were investigated. Methods developed based upon previous research were tabulated and evaluated by objective criteria such as cost savings, resource savings, and road user/stakeholder satisfaction. The researchers reviewed the data and identified the most effective risk analysis techniques, which served as the basis for the maintenance risk modeling under this project."
Date: September 2011
Creator: Gonzales, Epigmenio.; Li, Wenxing; Murphy, Mike; O'Connor, James T.; Bhat, Chandra R. & Yildirim, Yetkin
Item Type: Report

Materials selection for concrete overlays : information survey review and evaluation of existing concrete overlays in Texas

Description: "A comprehensive search and review of the use of concrete overlays by the TxDOT districts as well as other DOTs was conducted, with special emphasis focused on gathering information about the constituent materials and mixture proportioning used in the concrete overlays. This review also included new materials such as fibers used in previous studies and new types of fibers currently available. Publications and articles covering the various overlay rehabilitations were used as the background this project, as well as the several studies and implementation projects have been conducted for TxDOT."
Date: April 2011
Creator: Kim, Dong Hyun; Trevino, Manuel; Whitney, David P. & Ferron, Raissa
Item Type: Report

Materials selection for concrete overlays : the final report

Description: Concrete overlays have been a rehabilitation method for many years. It has been extensively utilized and studied in other states, but Texas is still at an initial stage of fully implementing the method. The large volume of concrete highways in Texas makes bonded concrete overlays, unbonded concrete overlays, and whitetoppings very viable options. However, there is a lack of educational guidelines for pavement engineers for concrete overlay construction. This research presents the information gathered from literature review, condition survey, and evaluation of existing concrete overlays in Texas. Also, a laboratory research was performed for recommendations for materials selection and construction for concrete overlays. From these, guidelines for materials selection and construction method developed that will assist in future concrete overlays in Texas are presented.
Date: July 2012
Creator: Kim, Dong H.; Fowler, David W.; Ferron, Raissa P.; Trevino, Manuel M. & Whitney, David P.
Item Type: Report