2008 ... Brian Schnittker and Oguzhan Bayrak · In 2004, The Texas Department of Transportation initiated Project 5197 to investigate the feasibility of increasing the allowable compressive stress limit at prestress transfer. Initially, the live load performance of 36 specimens was evaluated by Birrcher and Bayrak (TxDOT Report 5197-1, 2007).
5197-4 [CTR] ... FHWA/TX-09/0-5197-4
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2008 ... Christopher Heckman and Oguzhan Bayrak · In recent years, several research projects have been conducted to study the feasibility of increasing the allowable compressive stress in concrete at prestress transfer, currently defined as 0.60f'ci in the AASHTO LRFD Bridge Design Specifications. Increasing the limit would result in
5197-3 [CTR] ... FHWA/TX-09/0-5197-3
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2007 ... Robin Tuchscherer, David Mraz and Oguzhan Bayrak · The intention of the research presented in this report was to determine the source of flexural cracking of AASHTO Type IV girders. Cracking was observed in the end regions of the beams at the time of prestress transfer. Seven full-scale AASHTO Type IV beam specimens were
5197-2 [CTR] ... 0-5197-2
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2009 ... Alejandro Avendano and Oguzhan Bayrak · In 2004, the Texas Department of Transportation initiated Project 0-5197 to investigate the feasibility of increasing the allowable compressive stress limit at prestress transfer. Initially, the live load performance of 36 specimens was evaluated by Birrcher and Bayrak (TxDOT Report
5197-01-1 [CTR] ... FHWA/TX-10/0-5197-01-1
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2007 ... David Birrcher and Oguzhan Bayrak · In this report, the feasibility of increasing the allowable compressive stress limit at prestress transfer of 0.60f'ci is evaluated. For this purpose, the live-load performance and initial camber of pretensioned beams was investigated. Static-load tests were performed on 24 scaled and 12 full-scale
5197-1 [CTR] ... 0-5197-1
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2006 ... Alba Webb [and ten others] · Emissions that lead to the formation of ozone have distinctive temporal patterns, and the chemistry of ozone formation is non-linear and introduces time lags between emissions and ozone formation. As the transition is made between the 1-hour ozone National Ambient Air Quality Standard (NAAQS) and
5191-1 [CTR] ... 0-5191-1
Full-text Link:
2007 ... Terry Dossey · This software analyzes audio data collected using any impedance tube set up to measure absorption. Parameters describing the tube dimensions and microphone placement are entered on the first screen, which also graphically illustrates the impedance tube setup and specimen placement. It has been tested on
5185-P10 [CTR] ... Product 0-5185-P10
Full-text Link:
2009 ... Manuel Trevino and Terry Dossey · This report presents the results of noise testing performed on Texas pavements between May of 2006 and the summer of 2008. Two field test methodologies were used: roadside noise measurement with SPL meters and onvehicle sound intensity measurement of noise at the tire/pavement interface.
5185-3 [CTR] ... FHWA/TX-10/0-5185-3
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2007 ... Manuel Trevino-Frias and Terry Dossey · This report documents noise testing performed on Texas pavements in the summer and fall of 2006. Test methods include roadside noise measurement with SPL meters and on-vehicle sound intensity measurement of noise at the pavement tire interface. Comparisons are made between
5185-2 [CTR] ... 0-5185-2
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2006 ... Manuel Trevino and Terry Dossey · This project evaluates available technology for measuring pavement noise, and gives recommendations for equipment, protocols, and test sections in Texas. · Publ. by: University of Texas at Austin. Center for Transportation Research (CTR).
5185-1 [CTR] ... 0-5185-1
Full-text Link:
2006 ... Chandra Bhat [and five others] · This guide is designed for those interested in measuring the level of transit accessibility for a fixed route transit system. The purpose of this document is to provide users of the Trans- CAD-based Transit Accessibility Measure (TAM) software tool with instructions for installing and using the software.
5178-P3 [CTR] ... Product 0-5178-P3
Full-text Link:
2011 ... By: Chandra Bhat · "This comprehensive guide provides all of the information necessary to effectively use the Demand Response Transit (DRT) Accessibility Tool, including background literature, underlying methodology, and step-by-step instructions. The DRT Accessibility Tool was developed to provide the Texas Department of
5178-03-P1/P2 [CTR] ... Product 5-5178-03-P1; Product 5-5178-03-P2
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2011 ... Nazneen Ferdous, Gaurav Vyas, Chandra Bhat · This report discusses the application of the paratransit microsimulation patron accessibility analysis tool developed by the University of Texas researchers. The analysis tool is applied to four rural transit agencies in Texas. Workshops were held at these four agencies plus two other
5178-03-1 [CTR] ... FHWA/TX-11/5-5178-03-1
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2008 ... Chandra Bhat, Nazneen Ferdous, Jeffrey LaMondia · The DRT Accessibility Tool was developed to provide the Texas Department of Transportation (TxDOT) Public Transportation Division staff and other transportation professionals within the state of Texas a tool to measure and benchmark the level of accessibility for DRT systems.
5178-01-P2 [CTR] ... Product 5-5178-01-P2
Full-text Link:
2008 ... Jeffrey LaMondia, Nazneen Ferdous and Chandra Bhat · Demand Response Transit (DRT) is a critical form of transportation for handicapped, low income, and small/medium sized communities. This type of service, which transports riders through an on-demand basis, is commonly used in communities that are not dense enough to
5178-01-1 [CTR] ... FHWA/TX-09/5-5178-01-1
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2005 ... Chandra R. Bhat, Jessica Y. Guo, Sen Sudeshna and Lisa Weston · This report synthesizes knowledge from existing literature relating to the interpretation and measurement of transit service quality from a customer-oriented perspective. The focus is on the evaluation of fixed-route transit systems. In addition, we review earlier
5178-1 [CTR] ... 0-5178-1
Full-text Link:
2006 ... Chandra R. Bhat [and five others] · CONTENTS: Background -- Research Objectives -- Conceptual Structure of GPS-TDG -- Software Overview -- Tutorial using Sample Data from Laredo · Publ. by: University of Texas at Austin. Center for Transportation Research (CTR).
5176-P5 [CTR] ... Product 0-5176-P5
Full-text Link:
2006 ... Sivaramakrishnan Srinivasan [and five others] · Conventional travel-survey methodologies require the collection of detailed activity-travel information, which imposes a significant burden on respondents, thereby adversely impacting the quality and quantity of data obtained. Advances in the global positioning system (GPS)
5176-3 [CTR] ... 0-5176-3
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2005 ... Sivaramakrishnan Srinivasan · Conventional travel-survey methodologies require the collection of detailed activity-travel information, which imposes a significant burden on respondents, thereby adversely impacting the quality and quantity of data obtained. Advances in global positioning system (GPS) technology have provided
5176-2 [CTR] ... 0-5176-2
Full-text Link:
2005 ... Chandra R. Bhat, Sivaramakrishnan Srinivasan, and Stacey Bricka · Conventional travel-survey methodologies require the collection of detailed activity-travel information, which impose a significant burden on respondents, thereby adversely impacting the quality and quantity of data obtained. Advances in the Global
5176-1 [CTR] ... FHWA/TX-05/ 0-5176-1
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2006 ... Ian Hallett, David Luskin, and Randy Machemehl · Many local and regional transportation authorities in Texas are proposing retrofitted bicycle facilities--those added to existing roadways without changing the curb-to-curb width--under the Congestion Mitigation and Air Quality (CMAQ) Program and the Selective Traffic Enforcement
5157-1 [CTR] ... FHWA/TXDOT-06/ 0-5157-1
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2007 ... Travis Waller with Yi-Chang Chiu · Two innovative travel time prediction models were developed through this project. The fi rst model combines the advantages of statistical forecasting techniques and traffi c simulation models. The integrated simulation and statistical analysis-based model predicts the traffi c fl ows entering the
5141 P2-P5 [CTR] ... Product 0-5141-P2; Product 0-5141-P3; Product 0-5141-P4; Product 0-5141-P5
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2007 ... Brenda Bustillos [and four others] · As the technological complexities of and public demands upon our Intelligent Transportation Systems (ITS) infrastructure increase, new opportunities and requirements arise regarding how best to manage existing ITS assests and select future deployments. This research project aims to
5141-1 [CTR] ... 0-5141-1
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2007 ... Eric P. Koehler and David W. Fowler · This manual discusses quality control and testing procedures for SCC used in precast elements. It is intended for use by field inspectors responsible for pre-qualifying mixtures and assuring concrete quality. The information presented is of a general nature and may not be appropriate for all
5134-P1 [CTR] ... Product 0-5134-P1
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2007 ... David W. Fowler and Eric Koehler · Self-consolidating concrete (SCC) is an advanced type of concrete that can flow under its own mass without vibration, pass through intricate geometrical configurations, and resist segregation. The use of SCC in precast structural applications can result in increased construction productivity,
5134-1 [CTR] ... 0-5134-1
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2006 ... Jorge Prozzi · Publ. by: University of Texas at Austin. Center for Transportation Research (CTR).
5132-P4 [CTR] ... Product 0-5132-P4
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2007 ... Jorge A. Prozzi [and four others] · The Texas Department of Transportation (TxDOT) has recently established Hamburg Wheel Tracking Device (HWTD) specification criteria for Superpave mixtures (Item 344). This step has introduced a performance-related feature into an otherwise volumetric mix design approach structured to
5132-1 [CTR] ... 0-5132-1
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2007 ... Maria C.G. Juenger, John Hema, Sonia Solt · The objective of this research was to determine the effects of liquid nitrogen cooling of fresh concrete on concrete hydration and properties. Variables tested included cementing materials, admixtures, fresh temperature, cooling method, and time of cooling. Hydration rate and product
5111-1 [CTR] ... FHWA/TX-08/0-5111-1
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2008 ... Serena M. Markey [and five others] · Implementation Training Workshop for Best Practices for Repairing Spalls in Concrete Pavements. · Revised version of 0-5110-P3 · Publ. by: University of Texas at Austin. Center for Transportation Research (CTR).
5110-01-P1 [CTR] ... Product 0-5110-P3 rev.
2008 ... David Fowler, Dan Zollinger and David Whitney · The implementation project, 5-5110, Implementation of Best Spall Repair Practices for Concrete Pavement, was initiated to assist TxDOT in using more durable repair practices and materials for concrete spalls, especially in CRCP pavements. In the related previous research project
5110-01-1 [CTR] ... FHWA/TX-08/ 5-5110-01-1
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2008 ... Seongcheol Choi and Moon Won · Curing has substantial effects on the long-term performance of Portland cement concrete (PCC) pavement. TxDOT requires two applications of curing compounds, with a maximum 180 sf/gal per each application. However, no compliance testing is conducted for curing and, from a practical standpoint,
5106-2 [CTR] ... FHWA/TX-09/ 0-5106-2
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2009 ... Jung Heum Yeon, Chul Suh, and Moon C. Won · Curing of concrete has substantial effects on the performance of Portland cement concrete (PCC) pavement. Curing effectiveness depends on the quality of the curing materials, time of curing compound application in relation to evaporation, and the amount and uniformity of
5106-01-1 [CTR] ... FHWA/TX-09/5-5106-01-1
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2005 ... Dan Ye, Dan Zollinger, Seongcheol Choi and Moon Won · Curing of concrete has an effect on hardened concrete properties and overall long-term performance of portland cement concrete (PCC) pavement. A significant amount of research has been conducted to evaluate curing effectiveness and its effect on concrete properties. This
5106-1 [CTR] ... 0-5106-1
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2006 ... Alexei R. Tsyganov, Randy B. Machemehl, Nicholas M. Warrenchuk and Yue Wang · Pavement markings have definite functions in a proper traffic control system. They are applied for the purposes of regulating and guiding the movement of traffic, and promoting safety without diverting the driver’s attention from the roadway. It
5090-2 [CTR] ... 0-5090-2
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2005 ... Alexei R. Tsyganov, Randy B. Machemehl and Nicholas M. Warrenchuk · Pavement markings are an important part of the traffic control system, especially on rural two-lane roadways where these treatments often are the major traffic control measure. Compared to other types of longitudinal markings, the effect of edge lines on
5090-1 [CTR] ... 0-5090-1
Full-text Link:
2007 ... Khali Persad, C. Michael Walton and Zhong Wang · This research product provides in-depth analysis of the benefits and costs of Advanced Traveler Information Systems (ATIS) deployment to enhance toll road operations in Texas, the implementation issues of ATIS, and funding opportunities for ATIS implementations. A case study of cost
5079-P3 [CTR] ... Product 0-5079-P3
Full-text Link:
2006 ... Khali Persad, C. Michael Walton and Zhong Wang · This research product provides in-depth analysis of the impact of traveler information on commuters’ route choices in the toll road context. The details of a case study of the Austin, Texas metropolitan area are presented, showing impacts on the non-tolled network as well as on
5079-P2 [CTR] ... Product 0-5079-P2
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2006 ... C. Michael Walton, Khali Persad and Zhong Wang · To repay bond debt for new toll roads, investors will depend on toll revenue, an uncertain source. Studies have found that traffic on toll roads is initially low, and grows slowly over time as motorists become aware of the time savings and other benefits of a toll road. Given this
5079-1 [CTR] ... 0-5079-1
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2006 ... by Nathan Hutson, Rob Harrison · This PowerPoint presentation presents information on Project 0-5068: Planning for Container Growth in the Houston Ship Channel and other Texas Seaports · CONTENTS: Summary of First Year Findings -- Goals for Second Year Report -- Second year conclusions (Background, Container Forecast
5068-P3 [CTR] ... Product 0-5068-P3
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2007 ... Rob Harrison [and four others] · Study 0-5068 examined corridor improvement initiatives at all Texas seaports contemplating future container operations, with a primary focus on rail systems and current facilities under the Port of Houston Authority (POHA). This is the final study report and first estimates the volume of containers that
5068-2 [CTR] ... 0-5068-2
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2005 ... Robert Harrison [and three others] · This is a study of Texas port and rail infrastructure and its suitability for handling increased volumes of containers in the near future. The report is the latest in a series of studies performed by of the Center for Transportation Research for the Texas Department of Transportation. Four ports and
5068-1 [CTR] ... 0-5068-1
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2005 ... Mat Dolata [and three others] · "It is foreseen that the Texas Department of Transportation (TxDOT) will face many challenges—and in some cases opposition—when the agency proposes to accommodate both passenger and freight trains on the same track or the same right-of-way (e.g., commuter or intercity passenger rail service on
5022-P2 [CTR] ... Product 0-5022-P2
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2006 ... Jolanda Prozzi [and three others] · Given the forecast growth in the Texas population and freight movements, it is clear that substantial demands will be placed on the already heavily used transportation infrastructure of the state. Railroads are thus viewed as a key element of a greater intermodal solution to supply
5022-1 [CTR] ... 0-5022-1
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2006 ... Khali Persad, C. Michael Walton and Julie Wilke · This research product is a brochure summarizing best practices in toll project development agreements that may minimize the impact of traffic competition between tolled and non-tolled facilities, and thus reduce the need for a non-compete clause. These practices are extracted from 20
5020-P2 [CTR] ... Product 0-5020-P2
Full-text Link:
2006 ... Khali Persad, C. Michael Waltonn and Julie Wilke · This research product presents a synthesis of best practices in toll project development agreements to minimize the impact of traffic competition between tolled and non-tolled facilities and thus reduce the need for a noncompete clause. These practices are extracted from 20 case
5020-P1 [CTR] ... Product 0-5020-P1
Full-text Link:
2005 ... Khali R. Persad, C. Michael Walton and Julie Wilke · Private investors in toll roads sometimes request restrictive covenants such as non-compete clauses, which could prevent the public sector from adding capacity in the region for the life of the toll agreement. This research project examined 20 case studies of toll agreements in
5020-1 [CTR] ... 0-5020-1
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