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  Partner: UNT Libraries Government Documents Department
 Serial/Series Title: Technical report (Texas Transportation Institute)
Full-depth reclamation : new test procedures and recommended updates to specifications

Full-depth reclamation : new test procedures and recommended updates to specifications

Date: July 2012
Creator: Scullion, Thomas
Description: Rehabilitating an old pavement by pulverizing and stabilizing the existing pavement is a process referred to as Full Depth Reclamation (FDR). The stabilized layer becomes either the base or sub-base of the new pavement structure. This process has been used widely for over 20 years in Texas to strengthen and widen structurally inadequate pavement sections. This project developed guidelines on successful FDR practices, developed training materials, and identified areas where improvements to current practices are required. To improve the FDR process, this report includes the following enhancements: (1) As current laboratory testing to select the optimal type and amount of stabilizer takes too long and requires too much material, continue to run parallel testing with the small sample test protocols proposed in this report; (2) Use the falling weight deflectometer (FWD) during construction to validate that the design assumptions are being met; (3) Implement the proposed bond test to select the optimum prime material and amount needed to effectively bond the base to the surfacing materials; (4) Modify the specifications to avoid working in freezing conditions; and (5) Consider implementing the other modifications to specifications proposed in this report.
Contributing Partner: UNT Libraries Government Documents Department
Accommodating oversize and overweight loads: technical report

Accommodating oversize and overweight loads: technical report

Date: July 2012
Creator: Middleton, Daniel R.
Description: "In this report the research project resulted in a statewide map recommending primary and alternate Oversize/ overweight (OS/OW)route networks for the most common origins and destinations based on historical Motor Carrier Division data. Keeping strategic routes open for OS/OW loads and minimizing the number of reroutes along the way will reduce the impedance and unknowns in this critical segment of the motor carrier industry."
Contributing Partner: UNT Libraries Government Documents Department
Operational performance management of priced facilities

Operational performance management of priced facilities

Date: March 2011
Creator: Goodin, Ginger
Description: This study provides a framework in which operating decisions for priced facilities can be made and can guide the changes in operational strategies for a facility over time. The research process was initiated with a literature review and targeted interviews of toll and managed lane operators to assess the state of the practice in performance measurement for pricing and other operational changes. The research team then developed guiding principles for identification, selection, and communication of performance measures and targets. A conceptual framework was formulated and data collection infrastructure needs were also documented. The conceptual framework was then developed into a more detailed version in a web-based format. This report documents the research findings and results and provides guidance on the use of the web-based framework tool. In addition, several outreach products were developed under this study to assist agencies in communication of performance management principles for proactive management of priced facilities.
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Manual for Assessing Safety Hardware test 3-11 on the Texas T101 bridge rail

Manual for Assessing Safety Hardware test 3-11 on the Texas T101 bridge rail

Date: March 2011
Creator: Bligh, Roger P.
Description: The Texas T101 bridge rail is widely used in the state of Texas. Previous testing demonstrated its ability to contain and redirect passenger cars and a 20,000-lb school bus. Based on this testing, the Federal Highway Administration accepted the T101 bridge rail as an NCHRP Report 350 TL-3 barrier. However, its impact performance with pickup trucks was never evaluated. Under research project 0-5526, Impact Performance of Roadside Safety Appurtenances, researchers conducted a performance assessment of Texas roadside safety devices to help evaluate the impact of adopting the new AASHTO Manual for Assessing Safety Hardware (MASH) guidelines on current hardware. Testing and evaluation of the T101 bridge rail was recommended as a high priority. This recommendation was based primarily on the absence of pickup truck testing on the system, and concerns that the 27-inch rail height may not be compatible with pickup trucks and SUVs under design impact conditions. The T101 bridge rail did not meet MASH evaluation criteria for test 3-11. The vehicle overturned after losing contact with the barrier.
Contributing Partner: UNT Libraries Government Documents Department
Field evaluation of asphalt mixture skid resistance and its relationship to aggregate characteristics

Field evaluation of asphalt mixture skid resistance and its relationship to aggregate characteristics

Date: December 2010
Creator: Masad, Eyad
Description: This report documents the findings from the research that was carried out as part of Phase II of TxDOT Project 0-5627. The research included measurements and analysis of mechanical and physical properties of aggregates used in surface mixes in the state of Texas. These properties were aggregate shape characteristics measured using the Aggregate Imaging System (AIMS), British Pendulum value, coarse aggregate acid insolubility, Los Angeles weight loss, Micro-Deval weight loss, and Magnesium sulfate weight loss. In addition, a database of field skid number measurements that were collected over a number of years using the skid trailer was developed. The Dynamic Friction Tester (DFT) and Circular Texture Meter (CTMeter) were used to measure friction and texture, respectively, of selected asphalt pavement sections. These data and measurements were used to carry out comprehensive statistical analyses of the influence of aggregate properties and mixture design on skid resistance value and its variability. Consequently, a method and software were developed for predicting asphalt pavement skid resistance. This method requires inputs that describe aggregate resistance to polishing, mixture gradation, and traffic. The developed software can be used to select the mixture type and aggregate source that are needed to achieve the required level of skid ...
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Manual for Assessing Safety Hardware test 3-11 of the Texas Department of Transportation Portable Concrete Traffic Barriers with sign support assembly

Manual for Assessing Safety Hardware test 3-11 of the Texas Department of Transportation Portable Concrete Traffic Barriers with sign support assembly

Date: January 2011
Creator: Williams, William F.
Description: This report presents the details of the design developed for mounting the traffic control sign support on top a portable concrete traffic barrier (PCTB), description of the full scale crash test performed on the design, and an assessment and evaluation of the performance of the PCTB with the sign support mounted on top according to specifications of "Manual for Assessing Safety Hardware" (MASH). The PCTB mounted sign support assembly anchored to the top of the TxDOT Type 2 PCTB tested for this project performed acceptably for MASH test 3-11.
Contributing Partner: UNT Libraries Government Documents Department
Effect of climate change on crop production patterns with implications to transport flows and inland waterways

Effect of climate change on crop production patterns with implications to transport flows and inland waterways

Date: December 2011
Creator: Vedenov, Dmitry V.
Description: "This report analyzed the demand for transportation capacity and changes in transportation flows on inland waterways due to shifts in crop production patterns induced by climate change."
Contributing Partner: UNT Libraries Government Documents Department
Implementation report on PASSER V-07 training workshops

Implementation report on PASSER V-07 training workshops

Date: August 2009
Creator: Chu, Chi-Leung
Description: "The objective of this project was to conduct one pilot workshop and five regular workshops to teach the effective use of the enhanced PASSER V-07 arterial signal timing optimization software."
Contributing Partner: UNT Libraries Government Documents Department
Mobility and economic effects of system investments in Texas: 2010 to 2020

Mobility and economic effects of system investments in Texas: 2010 to 2020

Date: August 2011
Creator: Lomaz, Tim
Description: "The report summarizes estimates of the consequences of current funding levels and a range of greater and lesser funding amounts. The report describes the population, travel, system extent and expenditure data and analyses used to develop the mobility and economic effect analyses. An associated study by the Center for Transportation Research analyzed pavement maintenance spending and condition. Both the mobility and pavement studies were used as part of the March 2011 Texas 2030 Committee report."
Contributing Partner: UNT Libraries Government Documents Department
Incorporating sustainability into Texas Department of Transportation's transportation decision making : summary of work performed, methods used and results achieved

Incorporating sustainability into Texas Department of Transportation's transportation decision making : summary of work performed, methods used and results achieved

Date: October 2010
Creator: Zietsman, Josias
Description: "This report summarized the work performed in Fiscal Year (FY) 2009 and 2010 under TxDOT Implementation Project 5-5541-01-"Regional Workshops on Sustainability Enhancement Tool."
Contributing Partner: UNT Libraries Government Documents Department
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