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Laboratory and field performance measurements to support the implementation of warm mix asphalt in Texas

Description: An objective of this study was to monitor the performance of more than 10 warm mix asphalt (WMA) projects in the state. Several WMA technologies were included in the study (foaming, Advera, Evotherm, Rediset, Sasobit) and it was determined that performance of the warm mix was comparable to hot mix. In addition, mix from two warm mix projects were subjected to different curing times and temperatures and then evaluated for mixture volumetrics and performance properties. Results from this study le… more
Date: July 2012
Creator: Estakhri, Cindy K.
Item Type: Refine your search to only Report

The Overlay Tester : A Sensitivity Study to Improve Repeatability and Minimize Variability in the Test Results

Description: "This report presents a comprehensive sensitivity evaluation of the critical steps of the Overlay Tester (OT) test procedure in an attempt to optimize the OT repeatability and minimize variability in the test results."
Date: February 2012
Creator: Walubita, Lubinda F.; Faruk, Abu N.; Das, Gautam; Tanvir, Hossain A.; Zhang, Jun & Scullion, Tom
Item Type: Refine your search to only Report

Performance comparison of various seal coat grades used in Texas

Description: This report documents research efforts to provide comparative quantitative performance information for various grades of seal coat aggregate available in the Texas Department of Transportation standard specifications. Length of service before replacement and level of noise generated at the tire-pavement interface were the primary focuses of the relative performance evaluations. The additional service life possible from seal coats with larger aggregate and higher asphalt application rates is com… more
Date: July 2012
Creator: Krugler, Paul E.; Wirth, John E.; Estakhri, Cindy K.; Freeman, Thomas J.; Wikander, John P. & Wimsatt, Andrew J.
Item Type: Refine your search to only Report

Performance monitoring pavements with thermal segregation in Texas

Description: This report investigated the performance of asphalt surface mixtures that exhibited thermal segregation during construction from 2004 to 2009. The results do not show that thermally segregated locations will fail within three to seven years but they do show that instances of thermal segregation may continue to be anomalous locations in the layer that could lead to failures in the pavement structure.
Date: April 2012
Creator: Sebesta, Stephen & Scullion, Tom
Item Type: Refine your search to only Report

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
Item Type: Refine your search to only Report

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.
Item Type: Refine your search to only Report

TxDOT uses of real-time commercial traffic data : opportunity matrix

Description: Based on a TxDOT survey, a review of other state DOTs, and researcher understanding of Intelligent Transportation System (ITS) needs, the Texas Transportation Institute (TTI) team developed a comprehensive list of opportunities for TxDOT to consider pertaining to future use of private sector (PS) data. Specific opportunities for applying private data were reviewed in light of accuracy of the data, coverage areas, data availability, cost, and control of the data stream.
Date: January 2012
Creator: Middleton, Dan; Brydia, Robert; Kraus, Edgar; Cheu, Kelvin; Rajbhandari, Rajat, 1973-; Songchitruksa, Praprut et al.
Item Type: Refine your search to only Report
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