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  Partner: UNT Libraries Government Documents Department
 Serial/Series Title: Research report (Texas Tech University. Center for Multidisciplinary Research in Transportation)
 Collection: Texas State Publications
Analysis of the occurrence and statistics of hazardous materials spill incidents along Texas highways and suggestions for mitigation of transport-related spills to receiving waters

Analysis of the occurrence and statistics of hazardous materials spill incidents along Texas highways and suggestions for mitigation of transport-related spills to receiving waters

Date: June 6, 2011
Creator: Thompson, David B.; Morse, Audra & Acker, Jenna
Description: "This report presents the results from a research on the occurrence and distribution of hazardous materials spills along Texas highway during the period of record from 2002-2006."
Contributing Partner: UNT Libraries Government Documents Department
Capabilities/Limitations and recommendations for transporting Texas Department of Transportation's heavy-duty off-road construction and maintenance equipment fleet

Capabilities/Limitations and recommendations for transporting Texas Department of Transportation's heavy-duty off-road construction and maintenance equipment fleet

Date: May 2007
Creator: Lawson, William D. & Leaverton, Michael
Description: "This report reviewed Texas Department of Transportation's (TxDOT) off-road, heavy-duty construction and maintenance equipment transport requirements and assessed TxDOT's current equipment transport knowledge base and practices."
Contributing Partner: UNT Libraries Government Documents Department
Evaluating existing culverts for load capacity allowing for soil structure interaction

Evaluating existing culverts for load capacity allowing for soil structure interaction

Date: December 2010
Creator: Lawson, William D.; Wood, Timothy A.; Newhouse, Charles D. & Jayawickrama, Priyantha W.
Description: This study explores culvert load rating practices and procedures as applied to the Texas Department of Transportation's (TxDOT's) archive of 1477 culvert designs and their inventory of more than 13,000 in-service reinforced concrete box culverts. The problem is that when older culverts are load-rated based on current AASHTO policy, many competent, serviceable culverts are shown to be deficient, requiring load posting, retrofit or replacement. A disconnect exists between culvert structural analysis practices and actual culvert performance. To address this challenge, the research focused on development of a clear, repeatable and reliable procedure for TxDOT engineers and their consultants to use for load rating culverts in the TxDOT roadway system. Articulated in TxDOT's Culvert Rating Guide, the new load rating procedure uses three increasingly-sophisticated analysis approaches, ranging from a direct stiffness frame model to a production-oriented finite element model which accounts for soil-structure interaction. Validation of the Culvert Rating Guide involved three major tasks. First, the researchers load-rated a statistically representative sample of 100 of TxDOT's culvert designs. Second, a parametric study was performed to evaluate six independent variables associated with culvert load rating. Third, instrumented load tests on three in-service culverts were conducted to compare measured demands with predicted values. ...
Contributing Partner: UNT Libraries Government Documents Department
Hydraulic capacity of type-h inlets: final report

Hydraulic capacity of type-h inlets: final report

Date: December 2010
Creator: Cleveland, Theodore G.
Description: Type H Inlets are frequently used by the Texas Department of Transportation as median drains for divided highways. Despite frequent use, engineers do not have adequate design information to mathematically describe the hydraulic performance of these structures. Typically, it has been assumed that IL-H-G and IL-H-L function essentially the same as roadway grates or curb inlets, but there is no basis for that assumption. Type-H drop inlets were investigated using a database from literature-reported experiments for similar inlets and physical model studies conducted at Texas Tech University (TTU). SWMM was investigated as a predictive tool by comparison to the TTU experimental results. The SWMM model was subject to very minimal calibration yet predicted performance reasonably well, especially when full inlet capture may occur. Examples of performance prediction using HEC-22, the power-law model and SWMM are presented to provide some guidance for Type-H inlet design.
Contributing Partner: UNT Libraries Government Documents Department
Laboratory Evaluation of Constructibility Issues with Surface Treatment Binder

Laboratory Evaluation of Constructibility Issues with Surface Treatment Binder

Date: October 2011
Creator: Senadheera, Sanjaya Priyantha, 1959-; Prozzi, Jorge Alberto; Smit, Andre; Bannerjee, Ambarish; Tubb, Andrew & Niu, Lei
Description: This report discusses a study related to the use of emulsified asphalt (EA) as a binder for sealing roads after construction. Due to the number complex variables that affect EAs, this research is meant to help TxDOT personnel better predict which EA will be most effective and bond most quickly to allow roads to open for traffic.
Contributing Partner: UNT Libraries Government Documents Department
Use of dowel bars at longitudinal construction joints

Use of dowel bars at longitudinal construction joints

Date: August 2011
Creator: Ha, Soojun
Description: Report discussing the primary objective of this research project, whcih was to develop rational guidelines on the use of dowel bars in longitudinal construction joints (LCJs) for better-performing concrete pavements without potential longitudinal cracking problems.
Contributing Partner: UNT Libraries Government Documents Department