Search
Now showing items 1-10 of 1169
Corrosion Assessment for Failed Bridge Deck Closure Pour
(Virginia Tech, 2011-12-02)
Corrosion of reinforcing steel in concrete is a significant problem around the world. In the United States, there are approximately 600,000 bridges. From those bridges 24% are considered structurally deficient or ...
An Analysis and Critique of DEM Creaion and 3-D Modeling Using Airborne LIDAR and Photogrammetric Techniques
(Virginia Tech, 2001-06-22)
Three-dimensional (3D) visualization is rapidly becoming an important tool for many engineering projects. Accurate digital representations of terrain and ground features are extremely useful for efficient design, communication ...
Automated 2D Detection and Localization of Construction Resources in Support of Automated Performance Assessment of Construction Operations
(Virginia Tech, 2012-12-10)
This study presents two computer vision based algorithms for automated 2D detection of construction workers and equipment from site video streams. The state-of-the-art research proposes semi-automated detection methods for ...
A Generalized Log-Law Formulation For a Wide Range of Boundary Roughness Conditions Encountered in Streams
(Virginia Tech, 2011-08-30)
It is demonstrated that the method for locating a velocity profile origin, or plane of zero velocity, by fitting log profiles to streamwise velocity measurements is applicable to a larger range of roughness scales than ...
Designing a framework to guide renewal engineering decision-making for water and wastewater pipelines
(Virginia Tech, 2010-08-11)
Federal, state and private organizations have an urgent need for renewal of water and wastewater pipelines. A pertinent gap remains in understanding the relationship between deteriorated host-pipe conditions and renewal ...
Development of a Comprehensive Linear Response History Analysis Procedure for Seismic Load Analysis
(Virginia Tech, 2010-11-29)
This thesis reviews the parameters required to perform linear response history analysis according to Chapter 16 of the American Standard ASCE 7-10. A careful analysis is presented about the selection of ground motions ...
Phytoremediation Mechanisms of a Creosote-Contaminated Site
(Virginia Tech, 2001-05-17)
In 1990, creosote contamination was discovered at the location of a railroad tie treatment facility active in the 1950s until 1973. In 1997, a phytoremediation field study was implemented with the planting of 1,026 hybrid ...
Evaluating the Mechanical Properties and Long-Term Performance of Stabilized Full-Depth Reclamation Base Materials
(Virginia Tech, 2017-05-02)
State highway agencies are searching for more cost-effective methods of rehabilitating roads. One sustainable solution is full-depth reclamation (FDR), a pavement rehabilitation technique that involves pulverizing and ...
Assessing the Performance of an Emergency Vehicle Preemption System: A Case Study on U.S. 1 in Fairfax County, Virginia
(Virginia Tech, 2002-11-21)
Highway traffic control systems have been deployed to provide emergency vehicle preemption (EVP) at signalized intersections. Industry and transportation researchers have worked to develop analytical methods to establish ...
Sources and Transport of Black Carbon at the United States-Mexico Border near San Diego-Tijuana
(Virginia Tech, 2011-05-04)
At international border areas that suffer from poor quality, assessment of pollutant sources and transport across the border is important for designing effective air quality management strategies. As part of the Cal-Mex ...