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Articles 241 - 270 of 302
Full-Text Articles in Civil Engineering
Stabilization Of High Sulfate Soils, Nagasreenivasu Talluri
Stabilization Of High Sulfate Soils, Nagasreenivasu Talluri
Civil Engineering Dissertations - Archive
Stabilization of expansive soils using lime and cement has been a favorite technique for practitioners over the years. However, recent heaving and premature pavement failures in lime and cement treated subgrades containing sulfates led to question the validity of calcium based stabilization. When expansive soils containing sulfates are treated with calcium based stabilizers, calcium from stabilizer reacts with soil sulfate and clay alumina to form expansive mineral Ettringite. Formation and growth of the mineral Ettringite was reported as the cause of severe heaving in several pavement failures. Under favorable environmental conditions Ettringite transforms in to another expansive mineral Thaumasite. This …
Development Of A Model For Estimation Of Buried Large Diameter Thin-Walled Steel Pipe Deflection Due To External Loads, Jwala Raj Sharma
Development Of A Model For Estimation Of Buried Large Diameter Thin-Walled Steel Pipe Deflection Due To External Loads, Jwala Raj Sharma
Civil Engineering Dissertations - Archive
Design of buried pipeline systems involves solution of geotechnical and structural problems in addition to the hydraulics and mechanical issues. Just like any buried structure, it is of utmost importance to understand how the pipe interacts with the soil when subjected to external and internal loads. Based on the mode of withstanding loads, pipes are classified into two major categories, which are rigid and flexible pipes. Pipe material is the major factor governing the classification of a pipe being rigid or flexible. Rigid pipe is a pipe which is designed to withstand external dead and live loads and internal pressure …
Evaluation Of Surface Transportation Funding Alternatives Using Criteria System Established Through A Delphi Survey Of Texas Transportation Experts, Sasanka Bhushan Pulipati
Evaluation Of Surface Transportation Funding Alternatives Using Criteria System Established Through A Delphi Survey Of Texas Transportation Experts, Sasanka Bhushan Pulipati
Civil Engineering Dissertations - Archive
For more than a decade, transportation officials have been concerned that, at current levels, the fuel tax, the primary funding source of surface transportation in the United States, would not provide enough revenue to satisfy the ever rising transportation needs. Recent studies have evaluated alternative funding strategies at the national and state levels. In this dissertation, the author improves this evaluation procedure by developing a multi-criteria evaluation of different funding options for implementation in Texas using a technique called PROMETHEE. This evaluation uses a new criteria system established through his Delphi survey of Texas-based experts who are experienced in transportation …
Swcc And Clay Mineralogy Based Models For Realistic Simulation Of Swell Behavior Of Expansive Soils, Aravind Pedarla
Swcc And Clay Mineralogy Based Models For Realistic Simulation Of Swell Behavior Of Expansive Soils, Aravind Pedarla
Civil Engineering Dissertations - Archive
Predicting the volume change behavior of expansive soils has been a major challenge to the engineers in the past few years, due to the intricate couple effects caused by different soil composition parameters toward swelling. Hence, the behavior of an expansive soil is better understood with its inherent composition parameters. For this research, eight natural expansive clays have been sampled from different active swell zones across The United States. Basic soil classification was performed on these soil to identify the high plasticity and low plasticity clays. The swell behavior of these clays are studied using different testing methods and initial …
Non-Linear Finite Element-Based Material Constitutive Law For Zero Slump Steel Fiber Reinforced Concrete Pipe Structures, Alena Mikhaylova
Non-Linear Finite Element-Based Material Constitutive Law For Zero Slump Steel Fiber Reinforced Concrete Pipe Structures, Alena Mikhaylova
Civil Engineering Dissertations - Archive
This study presents a comprehensive investigation of performance and behavior of steel-fiber reinforced concrete pipes (SFRCP). The main goal of this study is to develop the material constitutive model for steel fiber reinforced concrete used in dry-cast application. To accomplish this goal a range of pipe sizes varying from 15 in. (400 mm) to 48 in. (1200 mm) in diameter and fiber content of 0.17%, 0.25%, 0.33%, 0.5%, 0.67% and 83% by volume were produced. The pipes were tested in three-edge bearing condition to obtain the load-deformation response and overall performance of the pipe. The pipes were also subjected to …
On The Concept Of Earthquake Resistant Hybrid Steel Frames, Seyed Mohammad Razavi
On The Concept Of Earthquake Resistant Hybrid Steel Frames, Seyed Mohammad Razavi
Civil Engineering Dissertations - Archive
The concept of hybrid steel frame system is presented in which mixtures of fully-rigid and semi-rigid steel connections are used in the 3-, 9- and 20-story SAC frames. Several different patterns and locations of semi-rigid connection replacements within the frame are examined in order to identify hybrid frames with the best seismic performance. The effective connection stiffness is identified by performing a parametric study on the initial stiffness of the semi-rigid connections. Then, the cyclic behavior of the connections with the most effective stiffness is obtained using nonlinear finite element analysis. Inelastic dynamic analyses are conducted on the proposed selected …
Investigations To Develop Field Stabilization Methods To Mitigate Surficial Slope Failures, Minh Le
Investigations To Develop Field Stabilization Methods To Mitigate Surficial Slope Failures, Minh Le
Civil Engineering Dissertations - Archive
Surficial slope failures induced by rainfall have been studied for many years. Current research supported by The United States Army Corps of Engineers (USACE) is undertaken at the University of Texas at Arlington on two sites, Joe Pool Dam and Grapevine Dam located in the Fort Worth district. The objective of the project is to find the best stabilization method to mitigate those failures. A testing area of 5 sections (one control and four treated) was established on each site with used admixtures of 20% compost, 4% lime with 0.30% polypropylene fibers, 8% lime with 0.15% polypropylene fibers, and 8% …
Hydraulic Performance Evaluation Of Different Recirculation Systems For Elr / Bioreactor Landfills, Shahed R. Manzur
Hydraulic Performance Evaluation Of Different Recirculation Systems For Elr / Bioreactor Landfills, Shahed R. Manzur
Civil Engineering Dissertations - Archive
The major aspect of bioreactor landfill is the addition of liquid and recirculation of collected leachate back into the waste mass through the subsurface Leachate Recirculation System (LRS). The leachate recirculation system consists of the perforated recirculation pipes placed inside horizontal trenches and the permeable beds with different orientation. The application of high permeability material (shredded tire chips, broken glass, pea gravel) in landfills is an emerging technology to distribute the moisture over a wider area in a shorter period of time. Horizontal or vertical perforated pipes are installed in bioreactor landfills as LRS with an expectation of uniform moisture …
Sustainable Slope Stabilization Using Recycled Plastic Pin In Texas, Mohammad Sadik Khan
Sustainable Slope Stabilization Using Recycled Plastic Pin In Texas, Mohammad Sadik Khan
Civil Engineering Dissertations - Archive
Shallow slope failures are predominant in the North Texas area and pose significant maintenance problems for the Texas Department of Transportation (TxDOT). As a cost effective alternative, the Recycled Plastic Pin (RPP) can be utilized to stabilize the shallow slope failure. RPP are fabricated from recycled plastics and waste materials (i.e. polymers, sawdust, and fly ash). It is a lightweight material and less susceptible to chemical and biological degradation than alternative reinforcing element. RPPs are driven into the slope face, which provide additional resistance along the slip surface and increase the factor of safety. The current study summarized the remediation …
Long-Term Performance Of Gfrp Reinforced Concrete Beams And Bars Subjected To Aggressive Environments, Yeonho Park
Long-Term Performance Of Gfrp Reinforced Concrete Beams And Bars Subjected To Aggressive Environments, Yeonho Park
Civil Engineering Dissertations - Archive
The use of fiber-reinforced polymer (FRP) bars in reinforced concrete (RC) structures has emerged as an alternative to traditional steel reinforcement environments and other applications where steel has shown greater vulnerability. Although the number of analytical and experimental studies on RC beams with FRP reinforcement has increased in recent decades, its long term performance is still questioned in comparison to the traditional steel reinforcement. That is, long-term performance is a much recognized but less-mentioned topic in the field of the reinforced concrete with glass-FRP (GFRP) re-bars. There is a need to validate long-term performance of FRP reinforced concrete structures, and …
Dynamic Bus Lane, Isaac F. Joskowicz
Dynamic Bus Lane, Isaac F. Joskowicz
Civil Engineering Dissertations - Archive
This dissertation documents the research conducted to investigate the feasibility of implementing a "Dynamic Bus Lane" (DBL) system on Westheimer Road in Houston, Texas, and to determine the particular conditions when the system could be applied to other arterial streets. The DBL system is a bus preferential system which would turn a normal traffic lane into a bus lane when a bus is approaching a bus stop at a major intersection. The bus would activate a dynamic message sign that would change the lane use from a normal traffic lane to a bus lane for the time when the bus …
Development Of A Flexible Pavement Design Procedure Based On The Mechanistic - Empirical Pavement Design Guide: A Case Study, Ali Qays Abdullah
Development Of A Flexible Pavement Design Procedure Based On The Mechanistic - Empirical Pavement Design Guide: A Case Study, Ali Qays Abdullah
Civil Engineering Dissertations - Archive
This research developed design tables of new flexible pavement structures for New York State Department of Transportation based on the Mechanistic Empirical Design Guide (MEPDG). The design tables were developed using the MEPDG software for Regions 1, 3, and 7 for Upstate part of New York State and for Regions 8, 10, and 11 for the Downstate part of New York State. The MEPDG software was used to run design cases for combinations of: climate conditions, traffic volume, subgrade soil stiffness (Mr) and pavement structures. The conditions that the MEPDG was used to run were: the road structures classified as …
Selective Catalytic Reduction Of Nitric Oxide Over Cerium-Doped Activated Carbons, Annaprabha Athappan
Selective Catalytic Reduction Of Nitric Oxide Over Cerium-Doped Activated Carbons, Annaprabha Athappan
Civil Engineering Dissertations - Archive
Selective catalytic reduction (SCR) with ammonia for diesel engine NOx reduction using activated carbon (AC) was studied. Comparisons of unmodified and cerium-doped Granular Activated Carbon (GAC), Activated Carbon Fiber (ACF), and Multiwall Carbon Nanotubes (MWCNTs) were conducted. Physical and chemical properties and durability of the catalysts were examined using Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), carbon hydrogen and nitrogen (CHN) analysis, X-ray Diffraction (XRD) analysis, Raman spectroscopy, X-ray Photoelectron spectroscopy (XPS), Thermo gravimetric analysis (TGA), Braunauer-Emmett-Teller (BET) surface area analysis and density analysis. Experiments were carried in a fixed bed column at various temperatures from 100º to 400º …
Investigation Of Co-Pyrolysis Between Sargassum Macroalgae And Polystyrene, Ketwalee Kositkanawuth
Investigation Of Co-Pyrolysis Between Sargassum Macroalgae And Polystyrene, Ketwalee Kositkanawuth
Civil Engineering Dissertations - Archive
Biomass is one source of renewable energy which helps minimize greenhouse gas (GHG) emissions, specifically carbon dioxide (CO2), since biomass utilizes CO2 via photosynthesis. Various conversion processes are applied to utilize energy from biomass, including pyrolysis. Pyrolysis is a thermal route of decomposing biomass at high temperature without the presence of oxygen. The process generates three main products including bio-oil, residue, and non-condensable gases; however, the most promising product is the biomass oil, which is in liquid form and convenient for handle and transport. Numerous studies on pyrolysis of terrestrial biomass reveal that the crude bio-oil cannot be directly used …
Modeling Leachate Bod And Cod Using Lab-Scale Reactor Landfills And Multiple Linear Regression Analysis, Said Altouqi
Modeling Leachate Bod And Cod Using Lab-Scale Reactor Landfills And Multiple Linear Regression Analysis, Said Altouqi
Civil Engineering Dissertations - Archive
The increasing production of municipal solid waste is a direct consequence of the continuous growth of the world's population and economy. This fact makes protecting the environment against contamination by different kinds of waste a challenging job for engineers and decision makers. Conventional landfilling practices have sometimes failed to protect fresh water resources against leachate contamination as well as the atmosphere against greenhouse gases such as carbon dioxide and methane. Many developed countries have already taken serious steps toward moving to properly engineered, environmental friendly landfills.Landfill leachate contains organic and inorganic pollutants that have been extensively studied in the last …
Geohazard Potential Of Rainfall Induced Slope Failure On Expansive Clay, Jubair Hossain
Geohazard Potential Of Rainfall Induced Slope Failure On Expansive Clay, Jubair Hossain
Civil Engineering Dissertations - Archive
Each year, rain induced slope failures cause significant damages in highway infrastructures and environments, as well as tragic losses of human lives around the world. Rainfall-induced slope failure is a common problem in areas with slope constructed on high plasticity clays. These post failure costs can be significantly reduced if precautions are taken ahead of time. Development of an early hazard warning system based on weather forecast data can help identify potential slopes susceptible to failure due to rainfall. But development of such system will require a better understanding of the in situ behavior of soil due to rainwater infiltration …
Degradation Of Triclosan By Sulfate Radicals Generated By Metal-Mediated Activation Of Oxidants, Prince Albert Nfodzo
Degradation Of Triclosan By Sulfate Radicals Generated By Metal-Mediated Activation Of Oxidants, Prince Albert Nfodzo
Civil Engineering Dissertations - Archive
The presence of persistent and toxic compounds, especially pharmaceuticals and personal care products (PPCPs) in water resources has generated considerable scientific, regulatory, and public interests, requiring the development of cost-effective technologies for the management of PPCPs-contaminated water resources. In particular, triclosan (TCS, 5-chloro-2-(2,4-dichlorophenoxy)phenol), an important antimicrobial agent widely used in many PPCPs, has attracted significant attention due to its potential endocrine disrupting capabilities. In order to address these concerns, advanced oxidation processes (AOPs), resulting in the generation of stronger oxidizing species, typically hydroxyl radicals (HRs) and sulfate radicals (SRs), have been studied and proposed to be effective to degrade a …
An Improved Model For Predicting Methane Emissions From Landfills Based On Rainfall, Ambient Temperature And Waste Composition, Richa Vijay Karanjekar
An Improved Model For Predicting Methane Emissions From Landfills Based On Rainfall, Ambient Temperature And Waste Composition, Richa Vijay Karanjekar
Civil Engineering Dissertations - Archive
Accurately estimating the emissions of methane (CH4) and carbon dioxide (CO2) in a landfill is important for quantifying its greenhouse gas (GHG) emissions and power generation potential. Previous studies have shown that variation in waste composition, rainfall and ambient temperature of a landfill significantly influences its methane generation potential. Current methane generation models, namely U.S. Environmental Protection Agency's (EPA) Landfill Gas Generation Model (LandGEM) and Intergovernmental Panel on Climate Change's (IPCC) methane generation model, are overly simplified and do not account for the variations in waste composition, rainfall and ambient temperature. The goal of this research was to improve our …
Development Of A True-Cost Concept For Renewal Of Municipal Underground Pipeline Systems, Dennis Abraham
Development Of A True-Cost Concept For Renewal Of Municipal Underground Pipeline Systems, Dennis Abraham
Civil Engineering Dissertations - Archive
Asset management principles for underground pipeline infrastructure (UPI) are used by municipalities for efficient delivery of water, wastewater, and storm sewers. Due to budget constraints and limited resources, municipalities need to improve their operations, utilizing an optimum cost to provide their asset management services. Life cycle costs (LCC) include the total cost of facility ownership taking into account all capital costs, operation and maintenance costs, and renewing or disposing costs. Asset management costs include the maintenance and renewal portion of LCC. The main objective of this research is to develop asset management strategies with consideration of all the cost factors …
Fluorinated And Fluorocarbon Coating Of Tio₂ By Pulsed Plasma Processing: Improved Photocatalytic Oxidation Of Gaseous M-Xylene And Mercury, Sulak Sumitsawan
Fluorinated And Fluorocarbon Coating Of Tio₂ By Pulsed Plasma Processing: Improved Photocatalytic Oxidation Of Gaseous M-Xylene And Mercury, Sulak Sumitsawan
Civil Engineering Dissertations - Archive
Titanium dioxide (TiO₂) is a preferred catalyst for photocatalytic oxidation of many air pollutants. In an effort to enhance its photocatalytic activity, TiO₂ was modified by pulsed plasma treatment. In this work, TiO₂ nanoparticles, coated on a glass plate, were treated with a plasma discharge of hexafluoropropylene oxide (HFPO) gas. By appropriate adjustment of discharge conditions, it was discovered that the TiO₂ particles can be either directly fluorinated (Ti-F) or coated with thin perfluorocarbon films (C-F). Specifically, under relatively high power input, the plasma deposition process favored direct surface fluorination. The extent of Ti-F formation increased with increasing power input. …
Unsaturated Soil Behavior Under Large Deformations Using A Fully Servo/Suction-Controlled Ring Shear Apparatus, Claudia Liliana Velosa Gamboa
Unsaturated Soil Behavior Under Large Deformations Using A Fully Servo/Suction-Controlled Ring Shear Apparatus, Claudia Liliana Velosa Gamboa
Civil Engineering Dissertations - Archive
In recent years, the key hypotheses of most elasto-plastic constitutive frameworks postulated for unsaturated soils have been validated via suction-controlled oedometer, triaxial, and direct shear testing. These techniques, however, allow for the application of loads along limited modes and levels of soil deformation. Today, it is well known that most geotechnical infrastructure resting on unsaturated ground involves a wide range of deformations. Calculation of foundation settlement, for instance, requires a good estimation of soil stiffness at relatively small strains. Analysis of slopes, embankments, and soil bearing capacity, on the other hand, requires an adequate estimation of shear strength, from peak …
Shear Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams Without Shear Reinforcement, Jae-Sung Cho
Shear Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams Without Shear Reinforcement, Jae-Sung Cho
Civil Engineering Dissertations - Archive
The ACI 318-08 building code allows to use the steel fiber reinforcement as alternative shear reinforcement with satisfying certain criteria when a beam is required minimum shear reinforcement. However, this provision applies to a nonprestressed and prestressed concrete beam such that it could be conservative since the shear strength of prestressed concrete beam is generally enhanced due to the prestressing force. This is due partially to the fact that the provision has been accepted based on researches, mostly conducted in nonprestressed concrete beam. Most of experiments conducted for prestressed concrete beam in small scale tests, with a height of specimens …
Flexural Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams And Double Punch Test For Fiber Reinforced Concrete, Netra Bahadur Karki
Flexural Behavior Of Steel Fiber Reinforced Prestressed Concrete Beams And Double Punch Test For Fiber Reinforced Concrete, Netra Bahadur Karki
Civil Engineering Dissertations - Archive
Steel fibers have widely been used in the past to reinforce brittle materials in many nonstructural applications such as pavement, tunneling lining, etc. On the basis of numerous previous studies, ACI 318-11 [2011] has recently accepted steel fiber as a minimum shear reinforcement replacement with minimum 0.75% volume fraction for both reinforced concrete and prestressed concrete members. However, not much previous research has talked about the flexural behavior of fiber reinforced concrete (FRC). As per ACI 318-11 for tension-controlled sections, the net tensile strains in the outermost layer of steel, εt, should be greater than or equal to 0.005 and …
Effect Of Pavement Type On Fuel Consumption In City Driving, Palinee Sumitsawan
Effect Of Pavement Type On Fuel Consumption In City Driving, Palinee Sumitsawan
Civil Engineering Dissertations - Archive
Vehicular fuel consumption and emissions are two increasingly important measures of effectiveness of sustainable transportation systems, particularly considering that mobile sources in the U.S. account for the largest consumption of energy and generation of air pollution. Improving the energy efficiency of the transportation sector including improving vehicle shape, weight, engine size, and tire quality could play a vital role in reducing fuel consumption and exhaust gas emissions. Pavement surface type and other surface characteristics such as skid resistance and roughness affect vehicular fuel consumption. The main objective of this study has been to investigate any differences that might exist in …
Development Of A Model Of Productivity For Horizontal Directional Drilling (Hdd), Mohmd Sarireh
Development Of A Model Of Productivity For Horizontal Directional Drilling (Hdd), Mohmd Sarireh
Civil Engineering Dissertations - Archive
Horizontal Directional Drilling (HDD) is a growing method for installation of pipes in urban areas and where ever trenching is impossible or undesirable; such as in crossing rivers, lakes, and railways, and special areas such as airports. This technique utilizes downhole cutting heads to create a pilot borehole before it is enlarged with back reamers to allow pulling back of a product pipe. The utilization of HDD for the installation of underground infrastructure (i.e., water, oil and gas pipes, telecommunication, power conduits, in some cases gravity pipes, and so on), has shown a rapid growth compared to other trenchless technologies. …
Impact Of Transit-Oriented Infrastructure Investments On Property Valuations, Francis Amodu Smith
Impact Of Transit-Oriented Infrastructure Investments On Property Valuations, Francis Amodu Smith
Civil Engineering Dissertations - Archive
The population explosion of the second half of the last century brought about increased human activity. Much of the attendant increased access to activities has been facilitated by the incredible technological advances in the automobile, which depends almost entirely on fossil fuels. Supplies of fossil fuel are limited and the automobile has led to urban sprawl, traffic congestion, and reduced quality to life in cities (1). This type of development is unsustainable. Transit-oriented development (TOD) is one of the neo-urbanism response instruments. The question is: "How well do these urban forms perform in North-Central Texas? In response, this study has …
Nano-Modified Cement Composites And Its Applicability As Concrete Repair Material, Tanvir Manzur
Nano-Modified Cement Composites And Its Applicability As Concrete Repair Material, Tanvir Manzur
Civil Engineering Dissertations - Archive
Nanotechnology or Nano-science, considered the forth industrial revolution, has received considerable attention in the past decade. The physical properties of a nano-scaled material are entirely different than that of bulk materials. With the emerging nanotechnology, one can build material block atom by atom. Therefore, through nanotechnology it is possible to enhance and control the physical properties of materials to a great extent. Composites such as concrete materials have very high strength and Young's modulus but relatively low toughness and ductility due to their covalent bonding between atoms and lacking of slip systems in the crystal structures. However, the strength and …
A Non-Invasive Assessment Of Moisture Content Of Municipal Solid Waste In A Landfill Using Resistivity Imaging, Huda Shihada
A Non-Invasive Assessment Of Moisture Content Of Municipal Solid Waste In A Landfill Using Resistivity Imaging, Huda Shihada
Civil Engineering Dissertations - Archive
A bioreactor landfill is operated to enhance waste decomposition, gas production, and refuse stabilization. The fundamental aspect in the operation of a bioreactor landfill is the controlled addition of water and/or the recirculation of leachate into the landfill's waste mass. Since there is an increasing trend to operate landfills as bioreactor landfills, it is crucial to understand the moisture distribution within the landfill. Monitoring the moisture distribution within a bioreactor landfill is essential not only for the design and operation of leachate recirculation systems, but also to identify sites with non-uniform leachate distribution due to ponding and channeling.In the recent …
Design Of Short Drilled Shaft Foundations In High-Plasticity Clay Under Inclined Loading, Thornchaya Wejrungsikul
Design Of Short Drilled Shaft Foundations In High-Plasticity Clay Under Inclined Loading, Thornchaya Wejrungsikul
Civil Engineering Dissertations - Archive
Drilled shaft foundations are primarily used to support structures such as bridge piers, towers, buildings, transmission towers, and roadway cable barriers. Generally, the main characteristics of drilled shafts are to transfer the loads to the stronger layers in the vertical direction and also their ability to withstand lateral movements from lateral loads. Though the design of shafts are well established with respect to combinations of loads and moments, their behavior under pullout type inclined loading is not well established. The inclined load applied is the combination of lateral and uplift loads at the same time and structures such as ends …
On The Effects Of The Circular Bolt Pattern On The Behavior Of The Extended End-Plate Connection, Roozbeh Kiamanesh
On The Effects Of The Circular Bolt Pattern On The Behavior Of The Extended End-Plate Connection, Roozbeh Kiamanesh
Civil Engineering Dissertations - Archive
This study is pioneer in introducing the circular bolt pattern configuration in extended end-plate steel connections. Discovering the static and cyclic behavior of such connections is at the forefront of this research study. To accomplish this goal, full-scale experimental testing complemented with three dimensional non-linear finite element analysis were conducted. Due to the similarity between the behavior of T-Stubs under tension, and tension flange of the extended end-plate connection, experimental study was conducted on several T-Stub connections to study the effect of the bolt pattern configuration on the ductility, bolt force distribution, flange deformation, and overall performance of the connection. …