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  Partner: UNT Libraries Government Documents Department
 Serial/Series Title: Research report (Austin, Tex.)
Texas Department of Transportation administration research: tasks completed Fiscal Year 2010

Texas Department of Transportation administration research: tasks completed Fiscal Year 2010

Date: February 2011
Creator: Baker, Richard
Description: "This research project evaluates numerous transportation issues and develops findings and/or recommendations based on results. This project has been structured to address some of the emerging, critical, and unique considerations related to transportation."
Contributing Partner: UNT Libraries Government Documents Department
Implementation of technology for rapid field detection of sulfate and organic content in soils

Implementation of technology for rapid field detection of sulfate and organic content in soils

Date: March 2012
Creator: Shon, Chang-Seon
Description: This report discusses a protocol using the Veris 3150 for determination of sulfate-rich soils, which has been implemented to two full-scale projects in Dallas and Paris Districts.
Contributing Partner: UNT Libraries Government Documents Department
Best practice for using RAS in HMA

Best practice for using RAS in HMA

Date: October 2011
Creator: Zhou, Fujie.
Description: "The use of recycles asphalt shingles (RAS) in hot-mix asphalt (HMA) mixtures has the potential to significantly reduce the cost of asphalt paving mixes while conserving energy and preserving the environment. This report documents the best practices for the use of RAS in HMA in terms of Ras processing, characterizing the processed RAS (binder content,gradations, and performance grad [PG]), RAS mix design, production, and field construction."
Contributing Partner: UNT Libraries Government Documents Department
Developing a mixture design specification for flexible base construction

Developing a mixture design specification for flexible base construction

Date: October 2011
Creator: Epps, Jon A.
Description: "In the Texas Department of Transportation (TxDOT), flexible base producers typically generate large stockpiles of material exclusively for TxDOT projects. This large "state-only" inventory often maintained by producers, along with time requirements for testing and reduced manpower within TxDOT offices, resulted in this project's investigation into a mixture-design specification for flexible base. The goals of this project are to develop a flexible base specification that reduces TxDOT's burden for sampling and testing, reduces time and space burdens on producers for maintaining TxDOT-only stockpiles, and maintains or improves the quality of the base."
Contributing Partner: UNT Libraries Government Documents Department
Performance of lap splices in large-scale column specimens affectedby ASR and/or DEF

Performance of lap splices in large-scale column specimens affectedby ASR and/or DEF

Date: June 2012
Creator: Bracci, Joseph M.
Description: "This research program conducted a large experimental program, which consisted of the design, construction, curing, deterioration, and structural load testing of 16 large-scale column specimens with a critical lap splice region, and then compared and calibrated models developed in the analytical program with the experimental behavior. Specimens were carefully instrumented both internally and externally to monitor the strain behavior of the concrete and reinforcing steel from specimen construction, curing, deterioration, and final structural load testing."
Contributing Partner: UNT Libraries Government Documents Department
Pavement repair strategies for selected distresses in FM roadways

Pavement repair strategies for selected distresses in FM roadways

Date: June 2012
Creator: Dessouky, Samer
Description: "Expansive soil is considered one of the most common causes of pavement distresses in FM roadways. Depending upon the moisture level, expansive soils will experience changes in volume due to moisture fluctuations from seasonal variations. The objective of this research was to evaluate existing repair projects on selected FM roadways. Those roadways experienced failures in the form of fatigue and rutting in the wheel path, and longitudinal (faulted) cracking including edge cracking. The causes of those failures were mainly linked to high PI expansive soil and narrow pavement."
Contributing Partner: UNT Libraries Government Documents Department
Continuous prestressed concrete girder bridges. Volume 1, Literature review and preliminary designs

Continuous prestressed concrete girder bridges. Volume 1, Literature review and preliminary designs

Date: October 2011
Creator: Mander, John B.
Description: "The Texas Department of Transportation (TxDOT) is currently designing typical highway bridge structures as simply supported using standard precast, pretension-ed girders. TxDOT is interested in developing additional economical design alternatives for longer span bridges, through the use of the continuous precast, pretension-ed concrete bridge structures that use spliced girder technology. The objectives of this portion of the study are to evaluate the current stat-of-the-art and practice relevant to continuous precast concrete girder bridges and recommend suitable continuity connections for use with typical Texas bridge girders."
Contributing Partner: UNT Libraries Government Documents Department
Evaluation, presentation and repair of microbial acid-produced attack of concrete

Evaluation, presentation and repair of microbial acid-produced attack of concrete

Date: October 2011
Creator: Hu, Jiong
Description: This report evaluates the severity of the deterioration in bridges to determine if microbial induced deterioration (MID) is a significant contributor by visual inspection and a number of tests on twelve selected columns. This report also evaluates the effectiveness of suggested test procedures on identifying microbial attack on concrete and the integrity of deteriorated concrete due to the attack.
Contributing Partner: UNT Libraries Government Documents Department
Pavement preservation and system optimization task force

Pavement preservation and system optimization task force

Date: January 2011
Creator: Lomax, Timothy J.
Description: "This report provides: an overview of a proposed three-tier system, preliminary results from a state department of transportation (DOT) survey, initial estimates of required funding, ideas of UTP Category 1 Formula, and an overview of the status of mobility."
Contributing Partner: UNT Libraries Government Documents Department
Steel fiber replacement of mild steel in prestressed concrete beams

Steel fiber replacement of mild steel in prestressed concrete beams

Date: January 2011
Creator: Tadepalli, Padmanabha R.; Hoffman, Norman; Mo, Y. L. & Hsu, Thomas T. C. (Thomas Tseng Chuang), 1933-
Description: In traditional prestressed concrete beams, longitudinal prestressed tendons serve to resist bending moment and transverse mild steel bars (or stirrups) are used to carry shear forces. However, traditional prestressed concrete I-beams exhibit early-age cracking and brittle shear failure at the end zones despite the use of a high percentage of stirrups (4.2%). Moreover, producing and placing stirrups require costly labor and time. To overcome these difficulties, it is proposed to replace the stirrups in prestressed concrete beams with steel fibers.
Contributing Partner: UNT Libraries Government Documents Department
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