scholarly journals Synthesis of rainfall and runoff data used for Texas Department of Transportation Research Projects 0-4193 and 0-4194

Author(s):  
William H. Asquith ◽  
David B. Thompson ◽  
Theodore G. Cleveland ◽  
Xing Fang
2000 ◽  
Vol 1716 (1) ◽  
pp. 98-107 ◽  
Author(s):  
Kenneth H. Stokoe ◽  
James A. Bay ◽  
Brent L. Rosenblad ◽  
Michael R. Murphy ◽  
Kenneth W. Fults ◽  
...  

The Texas Department of Transportation (TxDOT), in partnership with the Center for Transportation Research, has implemented the Texas mobile load simulator (TxMLS) as a tool for accelerated testing of in-service pavements. Although the TxMLS has been used successfully to test in-service pavements in the Yoakum and Fort Worth districts, the fact that only one TxMLS machine exists limits the number of accelerated pavement tests (APT) that can be performed. Therefore, TxDOT is evaluating a modification of the rolling dynamic deflectometer (RDD) for use as a super-accelerated pavement tester. In this application, the truck-mounted dynamic loading system is operated in a stationary mode, with the loading rollers and rolling sensors of the RDD removed from operation. The servohydraulic actuator is used for application of harmonic loading to a wheel footprint on the pavement surface. Hundreds of thousands of load repetitions are applied in a matter of hours; hence the designation as super-accelerated testing. This stationary dynamic deflectometer (SDD) is being studied as a possible tool for use in expanding TxDOT’s APT program. The SDD may allow TxDOT to increase, in a cost-effective manner, the number of accelerated tests that can be performed. Preliminary tests have been performed with the TxMLS and SDD on two different pavement recycling strategies constructed on the northbound and southbound lanes of US-281 in the Fort Worth District. That the same conclusion was reached about the relative performance of the test sections with both machines indicates the potential usefulness of the SDD.


2008 ◽  
Vol 2060 (1) ◽  
pp. 153-161
Author(s):  
Edgar Kraus ◽  
Cesar Quiroga ◽  
Jerry Le

A critical process for the timely development and delivery of highway construction projects is the early identification and depiction of utility interests that may interfere with proposed highway facilities. The effective management of such utility interests or conflicts involves utility adjustment (or design changes), inspection, and documentation. The large number of stakeholders and the magnitude of the process result in enormous amounts of data. Despite substantial data exchange among utility accommodation stakeholders, few standards exist for exchange and management of utility data in the project development process. With sample data provided by the Texas Department of Transportation, research described in this paper addresses the issue of utility conflict management by analyzing specific utility conflict data flows and data needs of stakeholders. The paper presents the product of this analysis, which is a prototype system for managing utility conflict data called the Utility Accommodation and Conflict Tracker.


Author(s):  
Timothy K. Perttula ◽  
Bo Nelson ◽  
LeeAnna Schniebs

The S. Stockade site was discovered on a small rise (330 feet amsl) in the Tankersley Creek floodplain during a recent archeological survey for the Texas Department of Transportation. Tankersley Creek is a southward-flowing tributary to Big Cypress Creek, and enters that creek’s floodplain a few miles below the Lake Bob Sandlin dam. There is a dense concentration of prehistoric archeological sites throughout the Tankersley Creek valley, particularly post-A.D. 800 Caddo Indian sites. This paper discusses the archeology of the S. Stockade site, a Late Caddoan Titus phase settlement. The rise at the S. Stockade site is grass-covered (with a surface visibility of less than 10%), except along the eroded slopes, where the clay B-horizon subsoil is exposed. The old creek channel immediately to the west of the rise has recently been channelized, and between the rise and the channelized creek are several low-lying marshy areas with standing water.


Author(s):  
Jolanda Prozzi ◽  
Kellie Spurgeon ◽  
Robert Harrison

In 2000, the Texas Department of Transportation contracted with the Center for Transportation Research (CTR) at the University of Texas, Austin, to analyze containerized freight movements in Texas. Although aggregate data are available on the container sector and global movements, including data on container manufacturing, steamship companies, container routes, vessel capacities, and costs and supply chains, little information is available on container movements in the United States. To shippers and those directly involved in the container sector, some data on container movements in the United States—including route choice—are available. However, for those involved in freight planning at the state level, such information remains somewhat of a mystery. To fill this void, the CTR research team sought the assistance of various transportation stakeholders involved in containerized freight movements in an effort to characterize and gain a better understanding of this important and growing component of the freight sector. A total of 31 telephone interviews were conducted, involving 3 major ocean carriers, 12 trucking companies, 8 freight forwarders, 7 container leasing companies, and 1 railroad representative. Questions addressed container ownership, liability at different stages of a movement, benefits of different types of leases, container tracking (state of practice), transfer costs, security risks, and the outcome of a container at the end of its useful life. This study provides planners and those outside the industry with information on this dynamic sector and likely future changes.


1997 ◽  
Vol 1574 (1) ◽  
pp. 103-108 ◽  
Author(s):  
N. J. Delatte ◽  
D. W. Fowler ◽  
B. F. McCullough

For rehabilitation of concrete pavements, resurfacing with a bonded concrete overlay (BCO) may provide significantly longer life and reduced maintenance costs. Two important issues to consider in rehabilitation are bonding and rapid reopening of resurfaced sections. The purpose of accelerated or expedited concrete paving is to limit the duration of lane closure and inconvenience to the public. Expedited BCOs offer an economical method for substantially extending rigid pavement life. Research for expedited BCOs in El Paso and Fort Worth, Texas, has been carried out for the Texas Department of Transportation by the Center for Transportation Research at the University of Texas. Results of previous expedited BCO construction are reviewed. Laboratory testing for this project included a high-early-strength mix design, bond development of that mix design, and early-age fatigue strength of half-scale BCO models. A 122-m-long test strip was cast with eight different expedited BCO designs, and accelerated traffic loading was imposed at 12 hr. Recommendations are made for construction and quality control of BCOs for early opening to traffic.


Author(s):  
Dallas N. Little

Lime-stabilized clay subgrades are used almost routinely in Texas to facilitate construction and to provide a foundation for aggregate base courses and hot mix surfaces. Research sponsored by the Texas Department of Transportation demonstrates that the in situ moduli and strength improvements afforded by lime stabilization of these layers are often significant and deserve structural consideration. A study of the range of modulus values determined from falling weight deflec-tometer deflection data and supported by in situ dynamic cone penetrometer data for 40 pavement subgrades indicates that the lime-stabilized subgrades provide a level of stiffness and strength that is similar to that of an unbounded aggregate base. This substantiates previous literature suggesting that properly designed and constructed lime-stabilized subgrades should be assigned AASHTO structural coefficients in the same range as unbound aggregate bases, that is, between 0.10 and 0.14.


Author(s):  
Scott A. Cooner

The objective of a two-year study was to recommend school site planning guidelines for transportation-related elements such as site selection, general site requirements and design, bus operations, parent drop-off and pickup zones, driveways, turn lanes, signing and marking, parking, and pedestrian and bicycle access. The research team based these guidelines on a comprehensive review of existing guidelines and the results of field studies at school sites in Texas. Examples are provided of good practices and of practices to avoid for three of the more prominent guidelines. The guidelines are focused on transportation design, operations, and safety within school sites—with a particular focus on the parent drop-off and pickup zones. A site plan review checklist based on the 21 consensus guidelines approved by the project advisory panel is provided. Texas Department of Transportation engineers, field crews, architects, and school district personnel can use this checklist to coordinate efforts and improve the safety and efficiency of school site access and traffic flow.


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