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Articles 511 - 540 of 677
Full-Text Articles in Civil Engineering
Water Permeability In Fiber Reinforced Plastic (Fpr)-Wrapped Concrete, Jyoti Ojha
Water Permeability In Fiber Reinforced Plastic (Fpr)-Wrapped Concrete, Jyoti Ojha
Civil Engineering Theses - Archive
A finite element analysis is performed using ANSYS software to analyze progress of water and its circulation in FRP wrapped concrete. This paper presents the modeling of water diffusion in FRP. Finite element programs do not usually employ issue permeability or diffusion. Therefore, diffusion of water in FRP is modeled by analogy with thermal conduction. A brief description of theoretical background is presented in the paper. The recommended FE modeling procedures are listed. Diffusion coefficient of Tyfo SCH 41S-1 obtained from an inspection report is used to analyze water permeably of FRP. Tyfo SCH 41S-1 is the most popular FRP …
Resilient Moduli Properties Of Compacted Unsaturated Subgrade Materials, Pinit Ruttanaporamakul
Resilient Moduli Properties Of Compacted Unsaturated Subgrade Materials, Pinit Ruttanaporamakul
Civil Engineering Theses - Archive
According to the new Mechanistic Empirical Pavement Design Guide (MEPDG) and 1993 AASHTO flexible pavement design guide, Resilient Modulus (MR) has been used extensively as an important material property in structure design of pavement. The modulus is used as the primary input parameter to determine the stiffness parameters and constitutive behavior of pavement components. The system of pavement basically consists of the layers of surface, base, subbase (optional), and subgrade. The compacted subgrade soils supporting pavement structure are typically unsaturated with degrees of saturation varying from 75 to 90%. The effect of unsaturated soil behavior on the mechanical properties of …
Productivity Analysis Of Box Jacking, Hossein Tavakoli
Productivity Analysis Of Box Jacking, Hossein Tavakoli
Civil Engineering Theses - Archive
Trenchless Technology (TT) offers methods to install utilities through the ground without damaging the surface. Box Jacking is a trenchless method for installation of prefabricated box and drainage structures without digging a trench. The concept of box jacking is similar to pipe jacking operations by first excavating an entry shaft, building the thrust block and concrete base, and setting jacking equipment. The process starts with pushing boxes while excavating at face, however, the movement of each box is achieved each time excavation at the shield is completed. Additionally, a pilot tube might be required in advance of box jacking operations. …
Assessment And Rating Of Mechanically Stabilized Earth Walls, Noel Janacek
Assessment And Rating Of Mechanically Stabilized Earth Walls, Noel Janacek
Civil Engineering Theses - Archive
Mechanically stabilized earth (MSE) walls have been increasingly utilized in the United States since 1972 and in Texas since 1979. MSE walls provide earth retention for commercial, industrial and transportation projects throughout Texas. Within the transportation industry, the traditional design life of MSE walls is 75 years, with new projects requiring 100 year design life. The millions of square feet of existing MSE walls are generally less than half of the anticipated design life, making identifying and assessing the existing wall inventory a significant asset management component for optimizing maintenance expenditures. This thesis proposes and applies a system that assesses …
Resilient Properties Of Unsaturated Base Materials, Ranjan Kumar Rout
Resilient Properties Of Unsaturated Base Materials, Ranjan Kumar Rout
Civil Engineering Theses - Archive
A pavement system basically consists of a surface layer, a base course, a subbase (optional) and the subgrade. As per MEPDG and 1993 AASHTO flexible pavement design guide Resilient Modulus (MR) is used as the primary input parameter to determine the stiffness parameters and the constitutive behavior of pavement components, such as subgrade and unbound bases. Generally, pavements are constructed on compacted soils that are typically unsaturated with degrees of saturation varying from 75 to 90%. The main focus of this research is to determine the effect of matric suction on the resilient moduli property of the base materials. The …
Design Of Controlled Low Strength Material For Bedding And Backfilling Using High Plasticity Clay, Anil Kumar Raavi
Design Of Controlled Low Strength Material For Bedding And Backfilling Using High Plasticity Clay, Anil Kumar Raavi
Civil Engineering Theses - Archive
Flowable fill or Controlled Low Strength Material (CLSM) is a self-compacted cementitious material used in the field in the place of compacted fill. It is also known as unshrinkable fill, controlled density fill, flowable mortar, plastic-soil cement, soil-cement slurry, and others. The advantages of this material include lesser soil settlements, elimination of compaction, and lower costs when compared to chemically treated and compacted subsoils. CLSMs have a wide range of applications such as using them as a backfill, bedding material, trench filling material, void filling material, bridge abutment and embankment materials and also in pavement bases. Current research is aimed …
Selecting A Shaft/Pit Construction Method For Trenchless Technology, Bassam Abusad
Selecting A Shaft/Pit Construction Method For Trenchless Technology, Bassam Abusad
Civil Engineering Theses - Archive
The word shaft describes a vertical access point that is created by excavating, vertical boring, or blasting required before the start of tunneling or boring operations. Most trenchless technologies require entry shafts and exit shafts and in some cases and intermediate shaft Trenchless technologies are methods used for the construction and rehabilitation of underground utility pipes. Since pits and shafts are excavated below the ground surface level, Occupational Safety and Health Administration (OSHA) rules and regulations are enforced for the safety of the workers. The focus of this research is to describe shaft and pit construction methods as applied to …
Comparison Of Measured And Predicted Response Of Six Mnroad Asphalt Test Sections, Veni Valli Nagarajan
Comparison Of Measured And Predicted Response Of Six Mnroad Asphalt Test Sections, Veni Valli Nagarajan
Civil Engineering Theses - Archive
The study, sponsored by MnRoad, aimed to compare the measured and predicted values of strains and stresses for six cells 33, 34, 35, 77, 78 and 79 of the third MnRoad experiments. Cells 33, 34 and 35 were constructed for studying the polyphosphoric acid study while cells 77, 78 and 79 for the fly-ash stabilization study, during 2007. Each cell is instrumented with three transverse strain gauges and three longitudinal strain gauges at the bottom of HMA layer while three pressure cells were located at the top of the subgrade layer to measure vertical compressive stress.The FWD deflection data collected …
Computational Benchmarks In Simulation Of Cyclic Performance Of Steel Connections Using Three Dimensional Nonlinear Finite Element Method, Ali Abolmaali, Mohammad Razavi, Roozbeh Kiamanesh
Computational Benchmarks In Simulation Of Cyclic Performance Of Steel Connections Using Three Dimensional Nonlinear Finite Element Method, Ali Abolmaali, Mohammad Razavi, Roozbeh Kiamanesh
Civil Engineering Faculty Publications - Archive
The presented manuscript is intended to introduce accurate computational benchmarks to predict the hysteresis behavior of beam-column steel connections by means of a 3D non-linear finite element analysis. In this study, element type, inelastic material behavior, bolts pre-tensioning, and contact properties between different components of connections are discussed. Incremental nonlinear analysis takes into account all three types of nonlinearities including material, geometry, and contact properties in predicting moment-rotation hysteresis loops. A series of full-scale structural tests are performed to validate the results obtained from the finite element analyses. This study shows that cost efficient numerical analysis simulation is capable of …
Effective Construction Schedule Management: Construction Project Monitoring With Project Performance Indicators & The Project Status Report, Christopher Michael Totin
Effective Construction Schedule Management: Construction Project Monitoring With Project Performance Indicators & The Project Status Report, Christopher Michael Totin
Civil Engineering Theses - Archive
A thorough review of construction and engineering literature was conducted to discover and organize current best practices and standards for the purpose of monitoring a construction project. The status of a construction project is a measurement of its progress and performance in terms of time, cost, and scope. Awareness of a construction project's status improves decision-making on the part of owners, engineers, contractors, and other project stakeholders. Project Performance Indicators (PPI) are metrics generated by construction project schedules that define a project's status. Project personnel must monitor critical schedule and cost data, or PPI, in order to maintain control of …
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 …
Engineering Characteristics Of Recyled Plastic Pin, Lumber And Bamboo For Soil Slope Stabilization, Faisal Shakib Ahmed
Engineering Characteristics Of Recyled Plastic Pin, Lumber And Bamboo For Soil Slope Stabilization, Faisal Shakib Ahmed
Civil Engineering Theses - Archive
Shallow slope failures are predominant in North Texas and pose a significant maintenance problem. The traditional slope repair and stabilization techniques become expensive in some instances with direct costs associated in maintenance and repair of landslides. A new approach for slope stabilization has been developed using Recycled Plastic Pins ( RPP) to reinforce slope movements. The engineering properties of RPP in compression and bending strength along with environmental considerations dictate the design and repair of slopes using RPP. Two other materials have also been considered as an alternative: (1) Wood lumber and (2) Bamboo. Wood has many advantages as an …
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 Theses - 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 …
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 …
An Evaluation Of Large Diameter Steel Water Pipelines, Tushar Joshi
An Evaluation Of Large Diameter Steel Water Pipelines, Tushar Joshi
Civil Engineering Theses - Archive
Steel water pipelines, as a part of America's underground infrastructure, play a key role in maintaining the quality of life and well-being of communities. Thousands of miles of steel water pipelines make up a huge and complex water transmission system. This complexity generates the necessity for research on underground infrastructure in general and steel pipelines in particular. The objective of this research is to evaluate performance of large diameter (24 in. and larger) steel water pipelines. This research objective was achieved by use of a survey of various North American water utilities to provide details about their inventory. This data …
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 New Device To Evaluate Stabilization Durability Of Expansive Soils By Addressing Wetting/Drying And Leachate Issues, Priya Pravin Lad
Development Of A New Device To Evaluate Stabilization Durability Of Expansive Soils By Addressing Wetting/Drying And Leachate Issues, Priya Pravin Lad
Civil Engineering Theses - Archive
Expansive soils have been known to cause deterioration among all aspects of civil infrastructure for many years primarily due to the presence of clay minerals like Montmorillonite. Replacing these problematic soils is not a viable solution in that it is costly and time consuming.Although many stabilization techniques are available, chemical stabilization has proven to be an important tool in arresting the swell/shrink behavior of expansive soil, which is a major source of distress problems for most infrastructures built on this type of soils. Of the chemical stabilizers available in the market, lime and cement stabilizers are the two most widely …
Anaerobic Processes For Waste Treatment And Energy Generation, Melanie L. Sattler
Anaerobic Processes For Waste Treatment And Energy Generation, Melanie L. Sattler
Civil Engineering Faculty Publications - Archive
No abstract provided.
Evaporation From Soils Under Thermal Boundary Conditions: Experimental And Modeling Investigation To Compare Equilibrium- And Nonequilibrium-Based Approaches, Kathleen M. Smits, Abdullah Cihan, Toshihiro Sakaki, Tissa H. Illangasekare
Evaporation From Soils Under Thermal Boundary Conditions: Experimental And Modeling Investigation To Compare Equilibrium- And Nonequilibrium-Based Approaches, Kathleen M. Smits, Abdullah Cihan, Toshihiro Sakaki, Tissa H. Illangasekare
Civil Engineering Faculty Publications - Archive
In the shallow subsurface immediately below the land-atmosphere interface, it is widely recognized that the movement of water vapor is closely coupled to thermal processes. However, their mutual interactions are rarely considered in most soil water modeling efforts or in practical applications where it becomes necessary to understand the spatial and temporal distribution of soil moisture. The validation of numerical models that are designed to capture these processes is difficult due to the scarcity of field or laboratory data with accurately known hydraulic and thermal parameters of soils, limiting the testing and refinement of heat and water transfer theories. The …
Evaluating Beat Structure And Truck Allocation For The Tarrant County Courtesy Patrol, Farzad Daneshgar
Evaluating Beat Structure And Truck Allocation For The Tarrant County Courtesy Patrol, Farzad Daneshgar
Civil Engineering Theses - Archive
Non-recurring congestion poses a significant concern to urban freeway drivers. Effective incident management relies on many tools to lessen the overall impact of crashes, road debris, and stalled/disabled vehicles. While many of the tools are based in a region's traffic management center, many urban areas have adopted freeway service patrol (FSP) programs that patrol the freeway network searching for incidents, providing aid to motorists, and assisting with incident management and clearance. While FSP operations can be assessed in terms of response and clearance times, FSP management must consider the beat structure and fleet allocation. This investigation considers response time and …
Characterization And Evaluation Of Gas Generation Potential Of Municipal Solid Waste From A Closed Section Of A Landfill, Sonia Samir
Civil Engineering Theses - Archive
At present, there are more than 40 closed municipal solid waste (MSW) landfills around DFW and North Texas. A closed landfill might have potential benefits for gas recovery and utilization due to the presence of organic components in the MSW. The decomposition of organic components of MSW produces gas. The decomposition process after landfill closure may continue for 20 to 100 years depending on the operational practice of the landfill. However, to evaluate the methane potential of a closed landfill it is important to have the understanding of the characteristics of the existing or decomposed landfill wastes. The current study …
The Last Planner System For Realiable Project Delivery, Alok Patel
The Last Planner System For Realiable Project Delivery, Alok Patel
Civil Engineering Theses - Archive
The Last Planner System is a production planning system designed to produce predictable work flow and rapid learning in programming, design, construction and commissioning of projects. The Last Planner System (LPS) is developed by Glenn Ballard and Greg Howell as a production planning and control system to assist in smoothing variations in construction work flow, developing planning foresight, and reducing uncertainty in construction operations. The LPS challenges the old practices of developing schedules and pushing them from top management down to frontline people to execute. It advocates collaborative planning, performing collaborative constraint analysis, and learning from planning failures. The LPS …
Determination Of Geotechnical Properties Of Clayey Soil From Resistivity Imaging (Ri), Golam Kibria
Determination Of Geotechnical Properties Of Clayey Soil From Resistivity Imaging (Ri), Golam Kibria
Civil Engineering Theses - Archive
The use of resistivity imaging (RI) in the subsurface investigation has increased in recent years. RI is a non destructive method and provides a continuous image of the subsurface. Based on the electrical conduction phenomenon of soil, spatial and temporal moisture variation and he-terogeneity of subsurface can be evaluated from RI. However, only qualitative evaluation of sub-surface can be obtained from RI. The correlation between RI results and geotechnical engineering properties of soils has become an important issue for rigorous use of this method in site in-vestigation. The current study attempts to develop the relationship and correlations between geo-technical parameters …
Comparison Of Dust Generation From Open Cut And Trenchless Technology Methods For Utility Construction, Sahajanand Madhusudan Kamat
Comparison Of Dust Generation From Open Cut And Trenchless Technology Methods For Utility Construction, Sahajanand Madhusudan Kamat
Civil Engineering Theses - Archive
Construction industry has changed many aspects of human life and is still evolving at a rapid pace. New and better technologies which are environmentally friendly and safe are being introduced in this industry. But with the passage of time, this industry has got riddled with loss of human life and quality due to various scenarios. One of the major contributors to such conditions is dust generated on a construction site. The amount of dust a worker inhales during his whole career is very dangerous. This research has found out that using trenchless technology, this exposure to dust can be reduced …
The Effect Of Fiber Corrosion On Shear Capacity Of Steel Fiber Reinforced Concrete Beams And An Initial Investigation On Alkali-Silica Reaction In Steel Fiber Reinforced Concrete, Regina Nyambura Waweru
The Effect Of Fiber Corrosion On Shear Capacity Of Steel Fiber Reinforced Concrete Beams And An Initial Investigation On Alkali-Silica Reaction In Steel Fiber Reinforced Concrete, Regina Nyambura Waweru
Civil Engineering Theses - Archive
The first part of this research aims to investigate the effect of fiber corrosion on the shear capacity of Steel Fiber Reinforced Concrete beams. It will also strive to determine at what reduction in minimum diameter of the fiber does the effect of corrosion become most severe on the shear capacity of the beam. Four simply-supported beams with a shear span to depth ratio of 3.3 were subjected to a monotonically increasing load. The targeted concrete compressive strength for all beams was 6000 psi. This however differed from the measured strength due to a number of factors as will be …
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 …
Local Calibration Of Mechanistic Empirical Pavement Design Guide For North Eastern United States, Shariq A. Momin
Local Calibration Of Mechanistic Empirical Pavement Design Guide For North Eastern United States, Shariq A. Momin
Civil Engineering Theses - Archive
The Mechanistic-Empirical Pavement Design Guide (MEPDG) developed under the National Cooperative Highway Research Program (NCHRP) 1-37A project is based on mechanistic-empirical analysis of the pavement structure to predict the performance of the pavement under different sets of conditions (traffic, structure and environment). MEPDG takes into account the advanced modeling concepts and pavement performance models in performing the analysis and design of pavement. The mechanistic part of the design concept relies on the application of engineering mechanics to calculate stresses, strains and deformations in the pavement structure induced by the vehicle loads. The empirical part of the concept is based on …
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. …