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Mode I Fracture And Durability Of The Cfrp -Concrete Interface Bond, David Moses Boyajian
Mode I Fracture And Durability Of The Cfrp -Concrete Interface Bond, David Moses Boyajian
Graduate Theses, Dissertations, and Problem Reports
The continual degradation of civil infrastructures worldwide has prompted the need for effective solutions, posing major challenges to those involved with reinforced concrete structures. Externally bonded fiber reinforced polymer (FRP) composites have proven to be an efficient means of rehabilitation and enhancement to both existing and new structures alike. An important issue regarding this technology that needs further exploration, however, is the strength and integrity of the interface bond---the inadequacy of which can result in premature failure of the reinforced member.;Until now, there were no available methods to rigorously evaluate the interface bond strength and integrity for concrete structures externally …
Automation Of The Superpave Mix Design Process For The West Virginia Division Of Highways, Martin Felix Padula
Automation Of The Superpave Mix Design Process For The West Virginia Division Of Highways, Martin Felix Padula
Graduate Theses, Dissertations, and Problem Reports
During the fifty years between 1940 and 1990, the nation's bituminous roadways were predominantly designed using either the Marshall or Hveem method. The Superior Performing Asphalt Pavements (Superpave)(TM) method was later developed to address the issues of increased traffic volumes and heavier loads on the nation's roadways. This new mix design process relies on volumetric calculations and graphs, which are cumbersome to perform by hand. There is no current public domain Superpave software package available which is independent of any commercial laboratory product and available to an asphalt mix designer. A component of this research project consisted of creating a …
Mode-I Fatigue Fracture Of Interface For Fiber -Reinforced Polymer Composite Bonded To Wood, Junhui Jia
Mode-I Fatigue Fracture Of Interface For Fiber -Reinforced Polymer Composite Bonded To Wood, Junhui Jia
Graduate Theses, Dissertations, and Problem Reports
For applications in civil infrastructure rehabilitation and new construction, wood is being reinforced with externally bonded laminates and fabrics of fiber-reinforced polymer (FRP) composites. The potential benefits of external reinforcement with bonded FRP composites have been demonstrated through several studies, and the field implementation of this technology has been successfully proven in numerous projects. However, there is a concern with the long-term performance of the interface bond, since an inadequate bond strength and integrity can render the reinforcement ineffective and lead to premature failure of the structure. The performance of FRP-wood bonded interfaces under static and environmental loads have been …
Evaluations Of Concrete Overlays For Bridge Deck Applications, Shiwei Luo
Evaluations Of Concrete Overlays For Bridge Deck Applications, Shiwei Luo
Graduate Theses, Dissertations, and Problem Reports
Protective concrete deck overlays have been successfully used by WVDOH in a number of old and new concrete bridge decks to extend their service life, but in several cases delamination and failures have been observed. A comprehensive study has been recently defined to investigate overlays performance and delamination, culminating eventually in the development of specifications in collaboration with WVDOH and the Contractors and Building Supplies Associations of WV.;The present study is an exploratory research concerned with evaluations of four types of overlays for bridge deck applications, and include: latex modified concrete (LMC), microsilica modified concrete (MMC), microsilica modified concrete with …
Mechanical Characterization Of Aged Recycled Polymers And Applications, Jose Ricardo Basto
Mechanical Characterization Of Aged Recycled Polymers And Applications, Jose Ricardo Basto
Graduate Theses, Dissertations, and Problem Reports
The research focuses on the evaluation of mechanical properties (tension, bending, compression, impact, hardness and creep) of recycled acrylonitrile butadiene styrene (ABS) and polycarbonate (PC) thermoplastics obtained as electronic shredder residue (ESR) from computer housings. Three forms of polymers, i.e., virgin, blend of virgin and recycled, and 100% recycled were investigated to establish their long term mechanical properties. Chopped and continuous glass fiber/fabric addition to the resins was evaluated to study the thermo-mechanical properties.;Mechanical characterization was carried out at freeze-thaw cycling aging. It was found that recycled polymers retain at least 70% of their tensile, bending and compressive strength after …
Development Of Lightweight Frp Bridge Deck Designs And Evaluations, Isaac Lem Howard
Development Of Lightweight Frp Bridge Deck Designs And Evaluations, Isaac Lem Howard
Graduate Theses, Dissertations, and Problem Reports
The focus of this study was to develop and analyze lightweight FRP bridge decks and determine their adequacy under AASHTO's HS25 loading case with minimum stringer spacings of five feet. Two different multicellular decks were designed and tested during this study. Both decks had fiber volume fractions of approximately 54% and weighed 14--15 lb/ft2 of deck area. Testing was performed to determine both the elastic and failure response at the component level and the elastic response at the system level. Theoretical correlation of stiffness was made via approximate classical lamination theory, and maximum transverse load distribution factors were predicted. In …
Evaluation Of Strut-And-Tie Modeling For Bridge Pier Applications, Thomas Nicholas Ii
Evaluation Of Strut-And-Tie Modeling For Bridge Pier Applications, Thomas Nicholas Ii
Graduate Theses, Dissertations, and Problem Reports
Strut-and-tie modeling is an analysis and design tool for reinforced concrete elements which assumes that internal stresses are transferred through a truss type mechanism. The tensile ties and compressive struts serve as truss members connected by nodal zones. The internal truss idealized by the strut-and-tie model implicitly accounts for the distribution of both flexure and shear.;In 1998, the AASHTO LRFD Bridge Specifications (1998) incorporated the strut-and-tie modeling procedure for the analysis and design of deep reinforced concrete members where sectional design approaches are not valid. In most instances, hammerhead piers can be defined as deep reinforced concrete members and therefore, …
Seepage In Earth Slopes With Longitudinal Drainage Trenches, Ricardo Constantino Kiriakidis L.
Seepage In Earth Slopes With Longitudinal Drainage Trenches, Ricardo Constantino Kiriakidis L.
Graduate Theses, Dissertations, and Problem Reports
The major objective of this study was to determine the effect of hydraulic conductivity on the effectiveness and efficiency of longitudinal drains and on the time to reach steady state seepage under controlled laboratory conditions. An apparatus capable of simulating different slope angles and trench spacing was utilized in this study. By using this apparatus it was possible to obtain data regarding flow pattern, pressure heads, saturation time, influence of slope angle (theta), the trench spacing (W = 2w) and seepage depth (h) under steady state and transient conditions for different values of hydraulic conductivity. Two different soil types with …
Telecommunications For A Deregulated Power Industry, Biju Naduvathuparambil
Telecommunications For A Deregulated Power Industry, Biju Naduvathuparambil
Graduate Theses, Dissertations, and Problem Reports
Telecommunication plays a very important role in the effective monitoring and control of the power grid. Deregulation of the US power industry has enabled utilities to explore various communication options and advanced technologies. Utilities are increasingly investing in distributed resources, dynamic real-time monitoring, automated meter reading, and value added services like home energy management systems and broadband access for its customers. Telecommunication options like power line communications (PLC) and satellites are fast replacing legacy telephone and microwave systems in the US.;The objective of this thesis is to study the communication options that are available for utilities today. Phasor measurement units …
Establishing Design Vehicles For The Hang-Up Problem, Amy Lorraine Clawson
Establishing Design Vehicles For The Hang-Up Problem, Amy Lorraine Clawson
Graduate Theses, Dissertations, and Problem Reports
Current design vehicles do not address the hang-up problem. Two factors affect hang-ups: vehicle geometry and roadway geometry. There is a need to establish design vehicle characteristics for hang-up prone vehicles to reduce hang-ups potential.;Roadway geometry and vehicle characteristics relative to the hang-up problem were reviewed. Consideration of these properties by key organizations and associations, and government regulations were studied, and research performed by individuals establishing other design vehicles were analyzed. A general methodology was established.;When choosing design vehicles for the vehicle population, variation in vehicle population, the ramifications of using a limited number of vehicles, and local conditions were …
Use Of Flowable Fill As A Backfill Material Around Buried Pipes, Andrew Ray Simmons
Use Of Flowable Fill As A Backfill Material Around Buried Pipes, Andrew Ray Simmons
Graduate Theses, Dissertations, and Problem Reports
The objective of this research work was to study the performance of flowable fill as a backfill material around buried plastic corrugated pipes. The flowable fill materials used in this study contained varying proportions of fly ash, bottom ash, river sand, waste foundry sand, and cement. The relationships between flowability and compressive strength were investigated for different mixtures by using ASTM test methods in order to design suitable mixtures that meet WVDOT materials specifications. The second phase of the research was to design and construct a laboratory-scale pipe testing apparatus. The final phase was to find the pipe-soil interactions under …
Nondestructive Evaluation Of Frp Composite Members Using Infrared Thermography, Gurudutt Sundara Ram Bangalore
Nondestructive Evaluation Of Frp Composite Members Using Infrared Thermography, Gurudutt Sundara Ram Bangalore
Graduate Theses, Dissertations, and Problem Reports
The objective of this research is to establish infrared thermography as an effective tool for nondestructive evaluation of structural members made of fiber reinforced polymer (FRP) composite materials. The applicability of this method for the detection of subsurface anomalies such as voids, cracks, debonding, and delaminations in concrete bridge decks and pavements and in some configurations of FRP decks has been studied earlier by other researchers. These earlier studies have yielded reasonably satisfactory results though further refinement of the methodology and improvements in the image processing techniques were recommended.;To enhance the effectiveness of the infrared thermography technique, it is important …
Use Of West Virginia Permanent Traffic Recorder Data To Develop Factors For Traffic And Truck Variation, Jacob Scott D'Angelo
Use Of West Virginia Permanent Traffic Recorder Data To Develop Factors For Traffic And Truck Variation, Jacob Scott D'Angelo
Graduate Theses, Dissertations, and Problem Reports
The purpose of this study was to use data collected from the 52 permanent count stations located throughout the state to develop four sets of factors that would assist the West Virginia Department of Transportation (WVDOT) in the management and engineering of the roadways in West Virginia.;The objectives of this study were to: (1) Establish correction factors that can be applied to the short-term single pneumatic tube traffic count stations to adjust for the effect of three or more axle trucks on the volume counts. (2) Establish factors that use the peak hour volume (PHV) to estimate the design hour …
Comparison Of 19mm Superpave And Marshall Base Ii Mixes In West Virginia, Vasavi Kanneganti
Comparison Of 19mm Superpave And Marshall Base Ii Mixes In West Virginia, Vasavi Kanneganti
Graduate Theses, Dissertations, and Problem Reports
The Superior Performing Asphalt Pavements (Superpave(TM)) asphalt concrete mix design method was developed through Strategic Highway Program (SHRP) in 1993. With the introduction of Superpave mix design, the Marshall method of mix design is becoming obsolete for highway pavements. Superpave implementation varies by state. The WVDOH has implemented Superpave on all National Highway System projects since 1997. The decision regarding implementation of Superpave for low volume roads in WV is still under review.;The primary objective of this research work was to compare the 19mm Superpave and Base II Marshall design mixes in WV to supplement information required for WVDOH to …
Manufacture And Rehabilitation Of Guardrail Posts Using Composite Fabrics, Ram Chamarthy
Manufacture And Rehabilitation Of Guardrail Posts Using Composite Fabrics, Ram Chamarthy
Graduate Theses, Dissertations, and Problem Reports
The West Virginia Department of Transportation (WVDOT) uses approximately 50,000 wood and 200,000 steel guardrail posts on an annual basis. The need to develop guardrail posts made of a different material is motivated by the high cost of steel, along with the greater difficulty associated with driving large diameter wood posts.;The primary objective of this study was to develop a Glass Fiber Reinforced Polymer (GFRP) wood post that is more cost effective than a steel post and has smaller diameter than a conventional wood post. Another objective was to develop a portable fabric-wrapping machine for field applications.;Unwrapped and GFRP wrapped …
Modeling The Pultrusion Process To Obtain Low Void Fraction Composites, Adam Douglas Freed
Modeling The Pultrusion Process To Obtain Low Void Fraction Composites, Adam Douglas Freed
Graduate Theses, Dissertations, and Problem Reports
This work was directed at improving the strength and durability of pultruded composites. Pultruded composites are being used in an increasingly wider range of applications, and, as a result, a higher demand has been placed on the performance capabilities of the various components.;One target area for improving composites is the fraction of voids in the final product. The presence of voids in a composite decreases the Interlaminar Shear Strength, provides a site for the formation of fractures, and increases the susceptibility of the part to outside contaminants.;In this work, the various steps of the pultrusion process are analyzed in order …
Development Of An Innovative Connection For Frp Bridge Decks To Steel Girders, Jennifer Elaine Righman
Development Of An Innovative Connection For Frp Bridge Decks To Steel Girders, Jennifer Elaine Righman
Graduate Theses, Dissertations, and Problem Reports
The focus of this study is to develop an efficient connection to attach FRP bridge decks to steel girders. A new connection is designed which is versatile, cost-efficient, reliable and easy to install. The performance of this connection is then verified experimentally by a two-phase testing program. The first phase is concerned with individual component testing using modified push-out tests. The second phase is directed to implementing the connection in a reduced-scale bridge to evaluate the connection's system-level performance. Results of the experimental testing program are discussed. In addition, a finite element model of the reduced-scale bridge is formulated and …
Analysis And Robust Decentralized Control Of Power Systems Using Facts Devices, Karl E. Schoder
Analysis And Robust Decentralized Control Of Power Systems Using Facts Devices, Karl E. Schoder
Graduate Theses, Dissertations, and Problem Reports
Today's changing electric power systems create a growing need for flexible, reliable, fast responding, and accurate answers to questions of analysis, simulation, and design in the fields of electric power generation, transmission, distribution, and consumption. The Flexible Alternating Current Transmission Systems (FACTS) technology program utilizes power electronics components to replace conventional mechanical elements yielding increased flexibility in controlling the electric power system. Benefits include decreased response times and improved overall dynamic system behavior. FACTS devices allow the design of new control strategies, e.g., independent control of active and reactive power flows, which were not realizable a decade ago. However, FACTS …
Comparative Performance Of Rubberized Hot Mix Asphalt Under Alf Loading, Hanlin Qin
Comparative Performance Of Rubberized Hot Mix Asphalt Under Alf Loading, Hanlin Qin
Doctoral Dissertations
In response to the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991, Louisiana constructed five projects to evaluate several methods of using discarded tire rubber in highway pavements. The field performance was quite variable. To achieve the agreement among state agencies on the engineering benefits of using crumb rubber modifier (CRM) in HMA pavement and to define the circumstances where the LaDOTD can use asphalt rubber materials in the most cost effective way, a full-scale research program has been conducted at the Louisiana Transportation Research Center (LTRC) to evaluate the performance of CRM-HMA asphalt pavement under Accelerated Loading Facilities (ALF). …
Evaluation Of Civil Engineering Operations Flight Competitive Sourcing Standards And Metrics, Ty A. Randall
Evaluation Of Civil Engineering Operations Flight Competitive Sourcing Standards And Metrics, Ty A. Randall
Theses and Dissertations
The Performance Work Statement (PWS), which defines the requirements and shapes the outcome of the activity under contract, and the Quality Assurance Surveillance Plan (QASP), which is vital in identifying what is to be evaluated, become critical documents as the Air Force enters into more competitive sourcing contracts. Currently, contractors and Most Efficient Organizations (MEO) are evaluated by the QASP based upon the requirements found in the PWS. It is imperative the PWS and QASP documents have adequate performance metrics and that they are applied appropriately to evaluate the contractor or MEO. This research collected PWS and QASP documents from …
Decision Analysis With Value-Focused Thinking As A Methodology In Structuring The Civil Engineer Operations Flight, Dee Jay Katzer
Decision Analysis With Value-Focused Thinking As A Methodology In Structuring The Civil Engineer Operations Flight, Dee Jay Katzer
Theses and Dissertations
The civil engineer operations flight organizational structure has been in a state of change since the flight's inception and is currently prescribed only to the element level. Therefore, an operations flight commander must determine the organizational structure best suited for their unique situation without any guidance or support. To provide insight and defensible support for an operations flight commander faced with this decision, a value-focused thinking process was used to create a value model that aids in evaluating possible organizational structures. To ensure that the results of this research are applicable across the Air Force, the value model was created …