Civil and Environmental Engineering Commons^™

Experimental Studies To Address Strengths Of Limestone Cores, Sulfate Heave Problems In Limestone Cores And Tunnel Lining, Vivekananda Chikyala

Civil Engineering Theses - Archive

Sulfate induced heave is a common scenario in tunnels located on sedimentary rocks containing Pyrites. Pyrite oxidation produces Gypsum which is a major source of natural sulfates. DART NC -1B tunnel is located in Dallas, north Texas. Dallas is located on sedimentary rocks with high Pyrite content and has a history of sulfate induced heave problems in several projects. In spring 2005 & 2006, the shotcrete liner in DART NC-1B tunnel showed cracking associated with water leaks. Considering the local geology and the history of the tunnel, researchers at The University of Texas at Arlington (UTA) suspected probable occurrence of …

Performance Studies On Rigid Pavement Sections Built On Stabilized Sulfate Soils, Deepti Vasudev

Civil Engineering Theses - Archive

Soils of Southeast Arlington are highly expansive and rich in sulfates. They undergo sulfate induced heaving when traditional calcium based stabilizers are used for soil stabilization (Puppala et al. 1998). Traditional stabilizers do not provide effective solution since they are known to induce heaving, termed in the literature as sulfate induced heaving (Hunter, 1988). Both swelling and softening of these soils rich in sulfates induce considerable damage to overlying pavement infrastructure. Typically, high sulfate soils treated with calcium based stabilizers form ettringite mineral. Ettringite undergoes heaving when hydrated (Hunter, 1988; Puppala et al. 2001). Since this sulfate-induced heave is caused …

Effects Of A Debonding Flaw Size And Location On The Flexural Performance Of Cfrp Retrofitted Steel Sections, Sharad C. Choudhary

Civil Engineering Theses - Archive

In US there are several thousand steel bridges at present. Out of them many bridges are at various level of advance deteriorations due to many years of service life and environmental factors. These bridges cannot be fully replaced so retrofitting is the best choice .Earlier steel plates were used. With introduction of FRP in 1960.It is replacing the steel plates as they are lighter in weight and can be made stronger than steel. While installation of these FRP some kinds of Flaws are encountered. The variation of strength of carbon fiber reinforced laminate used for structural repair or strengthening containing …

A Performance-Based Incentive Program For Asphalt Pavement, Tim Wentz, Satya Peruri, Wayne Jensen, Bruce Fischer

Nebraska Department of Transportation: Research Reports

No abstract provided.

Characterization Of The Ibc Technologies Superlig¨ 620 Solid Phase Extraction Resin With Applications For Automated Process Monitoring, John Clements

All Theses

Characterization of the IBC Advanced Technologies SuperLig¨ 620 solid phase extraction resin was performed in order to develop an automated strontium-90 process monitor. The main focus was on strontium separation from barium, with the goal of developing an automated separation process for strontium-90 in Hanford high-level tank wastes. High-level waste tanks contain significant cesium-137 activities, of which barium daughters are of great concern as interferences to strontium quantification. A number of complexants were studied in a series of batch distribution coefficient experiments, as SuperLig¨ 620 was not previously known to elute strontium in typical mineral acids. The optimal separation was …

Evaluation Of Different Contra-Flow Strategies For Hurricane Evacuation In Charleston, South Carolina, Liz Stephen

All Theses

The number of category four and five hurricanes has nearly doubled over the past decade. Charleston, the second most populous city in South Carolina, is located on a very low peninsula, making it susceptible to floods during hurricanes and storm surges. In the event of a hurricane, the population at-risk must be evacuated to safety as quickly as possible. The Interstate system is the primary mode to evacuate at-risk population out of Charleston. Effective traffic management strategies are needed to manage the significant increase in demand on highways during the evacuation and contra-flowing traffic has been applied as a strategy …

Runway Incursion Mitigation, Capacity Enhancement, And Safety Improvements With Perimeter Taxiway Operations At Dallas Fort Worth International Airport, Satyamangalam D. Satyamurti

Civil Engineering Dissertations - Archive

A perimeter taxiway (PT) or end-around taxiway (EAT) operation is a new concept being developed at several airports around the country to eliminate active departure runway incursions during peak periods. PTs will enhance capacity by permitting uninterrupted, safe, continuous takeoffs and landings within the operations framework and guidelines established by the Federal Aviation Administration (FAA). For this research, the Dallas/Fort Worth International Airport's (DFW) proposed PT operations are considered for analysis and evaluation. This concept is tested using actual historical flight data at DFW for simulation and analytical modeling based on the FAA safety factors available in the Visual SIMMOD …

Dry Stone Masonry Culvert Restoration, Rick Younce, Theodore Hopwood Ii, Jane M. Wooley, Neil Rippingale

Kentucky Transportation Center Research Report

A damaged dry stone masonry culvert on KY 1268 Jessamine County was restored by the Kentucky Transportation Cabinet. The work was performed by the Dry Stone Conservancy, a non-profit agency promoting dry stone masonry. The work included replacement of a retaining wall and widening of the culvert. The project also included a partnering effort to improve the skills of local stone masons.

Archived Data Management System In Kentucky, Mei Chen, Jingxin Xia

Kentucky Transportation Center Research Report

Archived Data User Service (ADUS) was added to the national ITS architecture in 1999 to enable multiple uses for ITS-generated data. In Kentucky, ARTIMIS and TRIMARC are collecting volume, speed, occupancy, length-based classification, and incident data on a continuous basis. This study developed the Kentucky Archived Data Management System (ADMS) to archive and disseminate data collected by sensors in ARTIMIS and TRIMARC systems. This system is designed to be the prototype of ITS data clearinghouse in Kentucky.

The Kentucky ADMS operates on a web server that allows users to retrieve traffic data (i.e., volume, speed, lane occupancy) in 15 minute …

Permeability Of Municipal Solid Waste In Bioreactor Landfill With Degradation, Kiran Kumar Penmethsa

Civil Engineering Theses - Archive

Bioreactor landfills are operated and controlled to accelerate refuse decomposition, gas production and biological stabilization of the municipal solid waste (MSW). Leachate recirculation in bioreactor landfill creates a favorable environment for rapid microbial decomposition of the biodegradable components of solid waste. Therefore, clear understanding of the mechanism of moisture movement within the solid waste would be necessary for successful design and operation of the bioreactor landfill. Permeability is an important parameter during the design of leachate collection and recirculation system. In the current study an experimental program was designed to determine the variation of coefficient of permeability of MSW with …

Effectiveness Of Green Roof Stormwater Treatment Systems Irrigated With Recycled Green Roof Filtrate To Achieve Pollutant Removal With Peak And Volume Reduction In Florida, Martin Wanielista, Michael Hardin

BMP Trains Research and Publications

No abstract provided.

Autotrophic Denitrification Of Groundwater In A Granular Sulfur-Packed Up-Flow Reactor, Shih-Hui Pan

Civil Engineering Dissertations - Archive

Autotrophic denitrification is an effective treatment technique for nitrate removal from groundwater. Six basic elements are required for the growth of autotrophic denitrifiers: (1) electron donor, (2) electron acceptor, (3) active bacteria, (4) anoxic/anaerobic environment, (5) micronutrients, and (6) optimum pH and temperature. In this research, granular sulfur is an electron donor; nitrate is an electron acceptor; anoxic and anaerobic environment was maintained in the reactor, and micronutrients were added; pH was controlled between 6 and 9, and temperature was maintained at the room temperature (20 + 2 oC). Batch reactor and continuous up-flow reactor experiments were carried out to …

Information Flow To Support Front End Planning, Ryan George

All Dissertations

Previous research has demonstrated the value of front end planning as it impacts project performance. This dissertation summarizes the findings of a research project which examined ways to improve information flow through the front end planning process. The front end planning process was carefully diagrammed as consisting of 33 distinct information flow activities, each with its own information flow entities and interactions. Fifty-one questionnaire survey forms were analyzed to obtain data for the 33 information flow activities that included activity duration, resources expended, and other supplemental insights such as the extent of information availability. The 51 projects were then grouped …

Bs News

Building Services Engineering

No abstract provided.

Generalized Characteristics Of Resonant Polymer-Coated Microcantilevers In Viscous Liquid Media, Russell Cox, Michael J. Wenzel, Fabien Josse, Stephen M. Heinrich, Isabelle Dufour

Civil and Environmental Engineering Faculty Research and Publications

Expressions describing the resonant frequency and quality factor of a dynamically-driven, polymer-coated microcantilever in a viscous liquid medium have been obtained. These generalized formulas are used to describe the effects the operational medium and the coating has on the device sensitivity when used in liquid-phase chemical sensing applications. The derived expressions are shown to reduce to well-known formulas for the case of an uncoated cantilever in an invisicid [sic] medium and the case of a coated cantilever in air. The theoretical results are compared to existing chemical sensor data in aqueous and viscous solutions.

Wall And Ground Movements In A Braced Excavation In Clays And Serviceability Reliability Of Adjacent Buildings, Cheng Liang Hsiao

All Dissertations

The goal of this dissertation research is to establish an improved procedure for evaluating the excavation-induced ground settlement and building serviceability. This research covers several closely related topics. Firstly, a simplified small strain soil model developed by Hsieh et al. (2003), called the Modified Pseudo Plasticity (MPP) model, is evaluated for its capability and performance in the prediction of the excavation-induced ground deformation behavior using Finite Element Method (FEM). Secondly, for the development of the envisioned empirical models for estimating the excavation-induced wall and ground responses, a database of excavation case histories are compiled. To complement the database of excavation …

A Bayesian Method For Groundwater Quality Monitoring Network Analysis, Khalil A. Ammar

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Water resources management is best done when an efficient and reliable information system is available that provides data about the state of the water system being managed. Herein, a new methodology is developed and demonstrated that incorporates different aspects of monitoring, including vulnerability assessment, environmental health risk, the value of information, and redundancy reduction in an existing monitoring network. These various objectives reflect a desire for cost- efficiency, while taking into account uncertainty in predictions of groundwater contamination potential. This methodology is presented within an integrated approach to groundwater quality monitoring that includes several multi-objective aspects associated with decisions about …

On The Formation And Propagation Of Nonlinear Internal Boluses Across A Shelf Break, Subhas K. Venayagamoorthy, Oliver B. Fringer

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

High-resolution two- and three-dimensional numerical simulations are performed of first-mode internal gravity waves interacting with a shelf break in a linearly stratified fluid. The interaction of nonlinear incident waves with the shelf break results in the formation of upslope-surging vortex cores of dense fluid (referred to here as internal boluses) that propagate onto the shelf. This paper primarily focuses on understanding the dynamics of the interaction process with particular emphasis on the formation, structure and propagation of internal boluses on shelf. A possible mechanism is identified for the excitation of vortex cores that are lifted over the shelf break, from …

Internal Model Control Using Neural Network For Ship Roll Stabilization, Fuat Alarçïn

Journal of Marine Science and Technology–Taiwan

In this paper, a neural network (NN) based on internal model control (IMC) is developed to adjust control parameters for roll motions of a container ship. Controller architecture, which combines neural network with internal model control, has been outlined and its effectiveness demonstrated on the container ship roll stabilizer. The control signal error is used with back-propagation algorithm to update the weights of the neural controller. In conclusion, the neural network based on internal model control systems are analyzed, and compared to classical PID control results. As can be seen from numerical results, the NN based on IMC is implemented …

An Experimental Study On Progressive Wave-Induced Stresses Duration In Seabed Soil, Shang-Chun Chang, Lien-Kwei Chien, Jaw-Guei Lin, Yung-Feng Chiu

Journal of Marine Science and Technology–Taiwan

The total stress behavior in seabed soil induced by progressive waves was investigated in time sequence through the experiments in a wave flume. The static stress measurements show that the natural deposit seabed retains an initial shear stress that reduces the resistance capacity of shear strength of the soil. The dynamic stress measurements show that, by comparing with seabed surface pressure, the vertical stress, horizontal stress, and pore water pressure are found to have different phase shifts. Such phase shifts strongly affect the duration behavior of the total stresses of the soil and different from the current theories that assume …

Construction Superintendent Skill Sets, David E. Gunderson, Philip Barlow, Allan J. Hauck

Construction Management

This is the first of a series of articles reviewing the results of an ongoing qualitative research project designed to document construction superintendent skill sets and develop postsecondary curricula to support superintendent education. Varying views of the role of the superintendent and an historical perspective are presented in a review of literature. The research methodology for the entire project, as well as this first phase, is presented. Data have been coded and analyzed from the interviews with seven superintendents to date and the results of these analyses are provided. Themes that emerged in these interviews include people skills, understanding the …

Observations Of Structural Damage Caused By Hurricane Katrina On The Mississippi Gulf Coast, Christopher D. Eamon, Patrick Fitzpatrick, Dennis D. Truax

Civil and Environmental Engineering Faculty Research Publications

The loads associated with Hurricane Katrina led to the destruction or severe damage of approximately 130,000 homes and over 200 deaths in the state of Mississippi. This paper discusses the results of a field inspection of structural damage along the state’s Gulf Coast area caused by this hurricane. It was found that reinforced concrete, steel frame, and heavy timber structures generally performed well, with minimal structural damage. Precast concrete, light frame wood, and bridge structures generally performed poorly. Non-structural components of all building types, in particular facades and interior partitions subjected to storm surge, were typically destroyed. For various structures, …

Greenwood & Massey's Mill Turnpike Company (Sc 1467), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid and scan (Click on "Additional Files" below) for Manuscripts Small Collection 1467. Minute book, 1886-1899, for the Greenwood & Massey's Mill Turnpike Company, Warren County, Kentucky. The last two pages contain a plat and a listing of expenses for the Plano Church Cemetery, 1905-1909.

A Lean Modeling Protocol For Evaluating Green Project Delivery, Leidy E. Klotz, Michael Horman, Mark Bodenschatz

Publications

The first vital step to leaning an operation is to model or map the processes used to deliver value in that operation. This allows the requisite understanding of where waste and non value-adding activity exists, and provides the foundation for improvement. Current protocols for modeling operations present the basic tenets for lean mapping, but tend to be based in manufacturing language, and are not easily adapted to capital facilities projects. “Green” or “sustainable” capital projects delivered using current project delivery systems seem to be laden with hidden waste. These projects tend to be more challenging to deliver due increased levels …

Cuando Viene El Agua: Percepciones De Los Impactos Sociales Del Proyecto Hidroeléctrico “Chan-75” En Las Comunidades Ubicadas En La Cuenca Del Río Changuinola, Bocas Del Toro, Jeffery D. Stein

Independent Study Project (ISP) Collection

This report analyzes the anticipated social impacts of a hydroelectric project, titled “Chan-75,” in the surrounding communities. The project is located in the Bosque Protector de Palo Seco (BPPS) protected area along the Changuinola River. The flooding of 750 ha to create a reservoir for the dam will require the resettlement of roughly 1,000 residents of at least four indigenous Ngöbe Buglé communities including Valle del Rey, Charco la Pava, Changuinola Arriba, and Guayabal, in addition to the submersion of thousands of ha of farmland belonging to residents of nearby communities (Cordero et al). Once completed, the dam will generate …

Ole Miss Engineer 2007

Ole Miss Engineer

No abstract provided.

Operations-Oriented Performance Measures For Freeway Management Systems: Year 1 Report, Robert E. Brydia, William H. Schneider, Stephen P. Mattingly, Melanie L. Sattler, Auttawit Upayokin

Civil Engineering Faculty Publications - Archive

This report describes the year 1 activities on the project titled “Using Operations-Oriented Performance Measures to Support Freeway Management Systems.” Work activities included a comprehensive statewide survey on the use of performance measurement, as well as the initial recommendation on both operations and emissions-oriented performance measures to use in support of daily operations.

Stated Preference Modeling And Analysis Of Managed Lanes, Kaveh Farokhi Sadabadi

Civil Engineering Theses - Archive

The thesis deals with the Managed Lanes demand estimation problem in the state of Texas. Managed Lanes are a general type of High Occupancy Toll roads, whose lane management and operational features may be dynamically adjusted. A stated preference survey is designed in both English and Spanish to collect the required data. Each survey taker is presented with up to four scenarios. Scenarios are defined in terms of travel times in Managed Lanes versus General Purpose Lanes, as well as, the toll charged for access to the Managed Lane. Respondents were asked to choose among three modes and two lane …

Stormwater Effectiveness Of An Operating Green Roof Stormwater Treatment System And Comparison To Scaled Down Green Roof Stormwater Treatment System Chambers (2007), Martin Wanielista, Mike Hardin

BMP Trains Research and Publications

This report presents the results of a successful operating green roof in the state of Florida. The green roof is located on the Student Union building at the University of Central Florida. This green roof has thrived for more than two years hosting more than 50 tours educating architects, engineers, and policy makers on the many benefits green roofs provide.

Comparison of this full sized operating green roof stormwater treatment system with scaled down green roof stormwater treatment system chambers showed that the full size system can be described by the previously reported equivalent experimental chamber data. Thus the experimental …

Uncertainty And Error In Laser Triangulation Measurements For Pipe Profiling, Michael Kenneth Swanbom

Doctoral Dissertations

Underground pipeline infrastructure often receives insufficient attention and maintenance. Those responsible for ensuring the continuing functionality of this infrastructure primarily use subjective information in their decision making, and standards defining the level of damage acceptable before repair or replacement are difficult to implement. Laser pipe profiling is a relatively new technology that has emerged to take a step toward the objective assessment of buried assets. A laser profiler is a device that traverses a section of pipe, taking measurements of radius around the circumference of the inner pipe wall at multiple locations along the length of the pipe. The accuracy …