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Articles 31 - 60 of 303
Full-Text Articles in Civil Engineering
Risk Assessment Of Reinforced Concrete Sewer Pipes Under External Loading And Adverse Environmental Conditions Using An Adaptive Neuro-Fuzzy System, Khaled Saleh Khaled Abuhishmeh
Risk Assessment Of Reinforced Concrete Sewer Pipes Under External Loading And Adverse Environmental Conditions Using An Adaptive Neuro-Fuzzy System, Khaled Saleh Khaled Abuhishmeh
Civil Engineering Dissertations - Archive
Failure of sewer mains poses a significant threat to the society, necessitating a robust risk assessment tool that integrates failure likelihood and associated consequences for effective prioritization of mitigation efforts. This dissertation addresses this need through three key objectives: 1. Failure Likelihood Assessment: The study utilizes Monte-Carlo simulation to evaluate the probability of sewer main failures in common agressive environments, considering factors like sulfide and chloride exposures. It highlights that chloride-induced cracks and bond strength loss are more critical than sulfide-induced wall thickness loss. The degradation of concrete and reinforcement properties under chloride attack significantly reduces ductility, emphasizing the importance …
An Accelerated Corrosion Test Method For Pre-Cracked Reinforced Concrete, Shahriar Abed
An Accelerated Corrosion Test Method For Pre-Cracked Reinforced Concrete, Shahriar Abed
Civil Engineering Dissertations - Archive
Reinforced concrete (RC), a composite material combining the strength of concrete and the tensile strength of steel reinforcement, has significantly transformed the field of civil engineering and contributed to the advancement of modern infrastructure. Reinforced concrete structures are susceptible to deterioration over time despite their numerous advantages. One of the primary factors leading to the degradation of RC is the corrosion of steel reinforcement, primarily caused by exposure to aggressive environmental elements such as chloride ions, carbonation, and moisture. This dissertation aims to provide valuable insights into the accelerated corrosion behavior of steel bars embedded in concrete, considering factors such …
Comparison Of Condition Prediction Models To Prioritize Sewer Pipe Inspections, Madhuri Arjun
Comparison Of Condition Prediction Models To Prioritize Sewer Pipe Inspections, Madhuri Arjun
Civil Engineering Dissertations - Archive
Over time, wastewater collection systems deteriorate, necessitating ongoing adjustments and the development of asset management frameworks by utility proprietors to maintain the performance of their assets. Any asset management framework should emphasize the importance of asset inspection and condition assessment for system-efficient operation and maintenance. In the United States, closed-circuit television (CCTV) is the most common method for inspecting the interior of sewer pipelines. This procedure is expensive and time-consuming due to a city's extensive inventory of pipes. Due to the immense quantity of these pipes, every municipality can only inspect some sections of sanitary sewer pipes promptly. Therefore, the …
Artificial Intelligence-Based Evaluation Of Pipeline Structures Using Multi-Sensor Robots, Mohammad Shaher Moh'd Rababeh
Artificial Intelligence-Based Evaluation Of Pipeline Structures Using Multi-Sensor Robots, Mohammad Shaher Moh'd Rababeh
Civil Engineering Dissertations - Archive
ABSTRACT: ARTIFICIAL INTELLIGENCE-BASED EVALUATION OF PIPELINE STRUCTURES USING MULTI-SENSOR ROBOTS Mohammad Shaher Rababeh, Ph.D. The University of Texas at Arlington, August 2023 Supervising Professor: Ali Abolmaali All around the world, pipeline systems are safe, efficient, and cost-effective for transporting liquids such as stormwater and wastewater. However, different defects develop in pipeline structures with aging and use. Leaks and significant failures might create severe danger for the environment, and for humans in urban areas. This deterioration in pipelines happens under the influence of different factors. In general, observing and evaluating pipelines will allow us to understand its behavior under various conditions …
Breaking The Lignin Barrier With Termite Tav5 Treatment Technology (T4): Biopower And Biofuel From Agricultural Waste, Hussain Ali
Breaking The Lignin Barrier With Termite Tav5 Treatment Technology (T4): Biopower And Biofuel From Agricultural Waste, Hussain Ali
Civil Engineering Dissertations - Archive
Bioenergy obtained from anaerobic digestion of lignocellulose biomass is one of the promising candidates to help move towards a fossil fuel free future. Agriculture waste has up to 90% lignocellulose content, and the eight leading US crops produce over 500 million tons of residue each year. Unfortunately, lignin is resistant to microbial attack under low oxygen conditions which normally occur in anaerobic digesters, and it often shields lignocellulose components (cellulose and hemicellulose) from decomposition as well. Traditional physical/chemical methods for destroying lignin are typically costly due to energy and chemical requirements and can create toxic intermediates (Rahimi et al., 2020). …
Coastal Home Elevation For Flood Mitigation: Structural Safety And Benefit/Cost Analysis, Cedric Ling
Coastal Home Elevation For Flood Mitigation: Structural Safety And Benefit/Cost Analysis, Cedric Ling
Civil Engineering Dissertations - Archive
construction practice along the Texas Gulf coast under uniform floor live load. The first specimen had four panels with monolithically poured grade beams around each panel, while the second specimen had two panels with monolithically poured grade beams supported by additional steel beams. The second specimen also included carbon fiber reinforced polymer (CFRP) laminate retrofitting under one of the panels. The slabs were supported by concrete block masonry piers with various contact conditions. It was found that the typical contractor-determined elevation layout can withstand the building code-mandated floor live load. Increased column spacing decreased slab load capacity as expected. The …
Analytical And Experimental Of Electromagnetic Wave Propagation Effect On Moisture And Corrosion In An Inhomogeneous Medium, Dafnik Saril Kumar David
Analytical And Experimental Of Electromagnetic Wave Propagation Effect On Moisture And Corrosion In An Inhomogeneous Medium, Dafnik Saril Kumar David
Civil Engineering Dissertations - Archive
This dissertation presents electromagnetic wave studies for infrastructure. The research contributes to a comprehensive understanding of electromagnetic wave propagation in moisture and provides insights into corrosion detection and monitoring in reinforced concrete infrastructure. Three major studies are performed to: 1) understand the multiple wave scattering in inhomogeneous moisture medium, 2) validate the experimental reflection through analytical finite difference time domain simulations with experimental measurements, and 3) evaluate the electromagnetic wave responses in the early stage and post stage corrosion experimentally, and 4) develop rapid corrosion monitoring methodology for field applications by employing cutting-edge electromagnetic wave image processing as refer to …
Experimental Investigation Of Water Quality Impact On The Compressive Strength Of Concrete, Shayan Sharifzad
Experimental Investigation Of Water Quality Impact On The Compressive Strength Of Concrete, Shayan Sharifzad
Civil Engineering Dissertations - Archive
Water is an indispensable component in concrete, as it enables crucial chemical reactions. Therefore, the quality of water used in concrete plays a vital role in its performance. Contaminated water, sewage, or high-salt water can disrupt the cement's setting process and overall performance. As a result, it is crucial to prioritize the use of drinking water or water of equivalent quality in concrete production. While the ideal water-to-cement ratio for concrete is typically around 0.20, practical considerations often require a higher water content ranging from 0.30 to 0.70. This increased water consumption is necessary to ensure workability and achieve optimal …
Disaster Management And Recovery: Estimating The Disaster Impacts On Construction Costs And Evaluating The Policy Effects On Disaster Recovery, Sooin Kim
Civil Engineering Dissertations - Archive
A rapidly increasing number of natural hazards pose an inevitable threat to communities. More than a hundred natural hazards strike the United States every year, causing numerous fatalities and billions of dollars of property and infrastructure damage. The total cost of U.S. weather and climate disasters since 1980 has already exceeded 2 trillion dollars. As the number of U.S. county-level disasters has approximately tripled in recent decades due to rapid climate change, a greater share of the population is now more likely to expose to natural disasters. Adequate and timely reconstruction and recovery in post-disaster situations are essential for the …
Wide Band-Gap Metamaterials As Seismic Shields, Ashraf Mohammed Daradkeh
Wide Band-Gap Metamaterials As Seismic Shields, Ashraf Mohammed Daradkeh
Civil Engineering Dissertations - Archive
In the past decade, a new paradigm gained popularity among researchers aiming to protect structures from low-frequency seismic vibrations using metamaterials. However, developing a workable design for metamaterials is still challenging, given the various factors such as material availability, size, and shape of its components. This project proposes a new configuration that can widen the attenuation frequency of metamaterials and evaluates the attenuation ability of double-graded metamaterials. The project investigates unit cell parameters such as but not limited to size, density, and modulus of elasticity to finalize a unit cell with the broadest possible bandgap by using common construction material …
Model Development To Evaluate Consumers’ Intention To Adopt Electric Vehicles, Apurva Pamidimukkala
Model Development To Evaluate Consumers’ Intention To Adopt Electric Vehicles, Apurva Pamidimukkala
Civil Engineering Dissertations - Archive
ABSTRACT: The ever-increasing concern over climate change is compelling global economies to employ alternative fuel technology to combat the vehicular emissions of greenhouse gases. Electric vehicles (EVs) offer a viable environmentally friendly alternative that has the potential to facilitate an effective shift towards a sustainable transportation system with low emissions while preserving the environment. However, well-intentioned policies and other incentives have not been able to transcend the factors that prevent their adoption. Therefore, this research aims to develop three models to determine the factors affecting consumers’ willingness to adopt EVs. A questionnaire survey was designed based on an extensive literature …
Developing An Early Warning System Of Highway Slope Failure Based On In-Situ Hydraulic Conductivity Of Soil, Alinda Gupta
Developing An Early Warning System Of Highway Slope Failure Based On In-Situ Hydraulic Conductivity Of Soil, Alinda Gupta
Civil Engineering Dissertations - Archive
Highway slope failure is globally a momentous issue. Highway slope failure poses a significant issue in transportation infrastructure. Several factors can contribute to slope failures, including geological conditions, weather events, and human activities. Weather events like heavy rainfall, cyclic shrinkage and swelling can trigger slope failures constructed on high plastic clays. It increases pore water pressure, causing soil saturation, and inducing failure. The consequences of highway slope failures are severe, ranging from traffic disruptions, road closures, and damage to vehicles and infrastructure, to potential injuries or loss of lives. Addressing and mitigating slope failure risks is crucial for ensuring the …
Evaluation Of A First Flush System With Multiple In-Line Bypassing Fuel Separator Components In The Industrial Area Of An Airport, Kazi Rashid
Civil Engineering Dissertations - Archive
ABSTRACT: This dissertation explores the effectiveness of a complex system employed to capture the first flush (FF) generated from industrial activities occurring at an airport. The First Flush System (FFS) utilized by the DFW International Airport is comprised of multiple in-line bypassing fuel separators and located in many parts of the Air Operations Area (AoA) of the airport as well as maintenance areas. The system collects and conveys a portion of the rainfall runoff generated from the drainage areas of the industrial land-use portion of the DFW airport to a Stormwater Pre-treatment Plant (SWPTP) and then to Trinity River Authority …
Exploring Spatial Associations And Complex Interactions Between Geotechnical Properties And Electrical Resistivity Values In Clayey Soils, Mina Zamanian
Civil Engineering Dissertations - Archive
ABSTRACT: A successful design and construction of infrastructure systems such as highways and bridges highly depend on accurate estimation of geotechnical properties and understanding their spatial distributions, especially in reliability-based designs such as the load and resistance factor design (LRFD) method. Insufficient and inaccurate subsurface information has a major contribution to cost overruns and delays in up to 50% of all infrastructure projects. Insufficient site investigation may also contribute to inadequate or conservative designs, leading to costly failures or increased project costs. Hence, geophysical methods, such as electrical resistivity imaging, that can potentially transform the existing subsurface investigations are used …
The Impact Of Improper Solid Waste Management On Public Health Of African Cities. The Case Of Addis Ababa City, Ethiopia., Tesfaye Abebe Alemu
The Impact Of Improper Solid Waste Management On Public Health Of African Cities. The Case Of Addis Ababa City, Ethiopia., Tesfaye Abebe Alemu
Civil Engineering Dissertations - Archive
Many African cities are generating an ever-increasing amount of waste and the effectiveness of their solid waste collection and disposal systems is currently declining. Therefore, research has been striving to develop a sustainable and integrated solid waste management system that fits the current challenges facing the local environment. The objective of this study is to analyze the impact of improper solid waste management that affects the air and water quality of the near Koshe open dump site and around the Addis Ababa City, and their adverse effect on the public health living around them. The rapid increase of population in …
The Road Map For Sustainable Waste Management In The Federal Democratic Republic Of Ethiopia, Assegid Yimenu
The Road Map For Sustainable Waste Management In The Federal Democratic Republic Of Ethiopia, Assegid Yimenu
Civil Engineering Dissertations - Archive
Solid Waste Management (SWM) is a global issue from its social, environmental, and economic aspects. Poor SWM is one of the significant causes of resource degradation, environmental pollution, and public health problems. In this study, households’ solid waste generation and characterization were determined for selected cities in Ethiopia. Quantitative and qualitative study methods were applied to collect primary and secondary data to assess the household’s MSW generation rate and characterize the waste type's physical composition. The households’ daily MSW generation rates in Bole and Kirkos sub-cities, Addis Ababa, were found to be 0.54 and 0.26 Kg/capita/day, respectively, and the average …
Effect Of Impurities In Plastic Waste On The Performance Of Plastic Road, Niloy Gupta
Effect Of Impurities In Plastic Waste On The Performance Of Plastic Road, Niloy Gupta
Civil Engineering Dissertations - Archive
Plastic waste generation has become a global concern, with a large portion of plastics ending up in landfills. China's recent decision to stop importing waste from various countries, including the USA, has exacerbated the issue of plastic pollution. These plastics, as coming from the household and commercial trash, contain impurity and contamination. This makes the recycling process of plastics more hectic and causes issues in reusing them for other purposes. Impurity and contamination, in fact, is a major issue in material science. Researchers have been studying ways to improve the performance of bituminous pavement, as highways are experiencing increased demand …
Analysis Of The Impact Of Covid-19 On Construction Cost And Schedule Overruns, Nikhitha Adepu
Analysis Of The Impact Of Covid-19 On Construction Cost And Schedule Overruns, Nikhitha Adepu
Civil Engineering Dissertations - Archive
The construction industry, renowned for its dynamic nature, encountered unprecedented uncertainties throughout its history. However, the advent of the COVID-19 pandemic served as a powerful catalyst, underscoring the urgent need for a deeper comprehension of the challenges it introduced and their potential implications for the industry's future. While numerous studies have explored this topic, a comprehensive understanding of the specific factors that disrupted the construction sector during the pandemic remains elusive. To bridge this knowledge gap, this study identifies, categorizes, and ranks these challenges, while also proposing effective management strategies to mitigate their detrimental impact on construction projects. To lay …
Dynamic Response Of Cohesive-Frictional Soils Under Thermo-Controlled Constant Water Content Cyclic Simple Shear Testing, Daniel Robert Green
Dynamic Response Of Cohesive-Frictional Soils Under Thermo-Controlled Constant Water Content Cyclic Simple Shear Testing, Daniel Robert Green
Civil Engineering Dissertations - Archive
Dynamic Response of Cohesive-Frictional Soils Under Thermo-Controlled Constant Water Content Cyclic Simple Shear Testing Daniel R. C. Green The University of Texas at Arlington, 2023 Supervising Professor: Dr. Laureano R. Hoyos A considerable portion of the emerging geothermal infrastructure in the country is located in earthquake prone areas while being supported and/or surrounded by soil deposits located well above the groundwater table. Geotechnical earthquake research in the country, however, continues to be mostly focused on soil response under saturated conditions, especially soil liquefaction phenomena, while most of the work on dynamic response of compacted soils has not taken thermal conditioning …
Cement-Based Nanocomposites With Tunable Electrical And Thermal Conductivity, Myrsini Maglogianni
Cement-Based Nanocomposites With Tunable Electrical And Thermal Conductivity, Myrsini Maglogianni
Civil Engineering Dissertations - Archive
ABSTRACT: While concrete, the most widely used construction material exhibits low electrical and thermal conductivity, it can be engineered at the nanoscale to exhibit energy-related functionalities. This dissertation aims to develop nanoengineered cementitious composites with high electrical conductivity and tunable thermal conductivity to enable energy-related functionalities such as electricity generation and thermal heating capabilities. Highly dispersed nanostructured materials with different intrinsic properties were used to modify the thermal and electrical properties of the developed cementitious composites to enable their thermoelectric (TE) and/or electrothermal (ET) characteristics. One of the objectives of this research was to optimize the electrical-to-thermal energy conversion capability …
Investigation On The Impacts Of Land Subsidence And Urbanization On Flood Inundation In Texas, Han Jiang
Investigation On The Impacts Of Land Subsidence And Urbanization On Flood Inundation In Texas, Han Jiang
Civil Engineering Dissertations - Archive
Floods, being a prevalent and catastrophic natural hazard, have resulted in enormous losses to human lives and properties all over the world. Hence, there is a pressing need to enhance urban resilience and to improve emergency response capacities in order to mitigate the risks posed by flood hazards. Many models have been developed by engineers to simulate and examine the hydrologic and hydraulic responses to the changes within the physical environment. However, there are still knowledge gaps in advancing the understanding of the H&H behavior and hydrodynamics modeling performance. This doctoral study aims to help bridge such gaps via assessing …
An Integrated Algorithm For Automatic Gpr Data Processing For Concrete Rebar Location, Lihong Mao
An Integrated Algorithm For Automatic Gpr Data Processing For Concrete Rebar Location, Lihong Mao
Civil Engineering Dissertations - Archive
ABSTRACT: Ground Penetrating Radar (GPR) has emerged as a valuable nondestructive testing technique for subsurface imaging and characterization in civil engineering applications. In particular, GPR plays a crucial role in the evaluation of reinforced concrete (RC) structures, enabling the determination of concrete cover thickness and the localization of reinforcement. However, the effectiveness of GPR data analysis is often hindered by inherent challenges, such as unknown time-zero, strong noise, and blurred signals, making the accurate and simultaneous determination of rebar horizontal location and depth a challenging task. This Ph.D. research aims to address these challenges and enhance the accuracy and efficiency …
Digital Twin Enabled Winter Operations Management Through The Integration Of Artificial Intelligence, Sensory Level Data, And Publicly Available Data, Pooya Darghiasi
Digital Twin Enabled Winter Operations Management Through The Integration Of Artificial Intelligence, Sensory Level Data, And Publicly Available Data, Pooya Darghiasi
Civil Engineering Dissertations - Archive
Monitoring real-time information on road conditions, especially during winter storms, is crucial to establishing winter maintenance strategies by the State Departments of Transportation (State DOTs) in the United States. States and local highway agencies allocate substantial resources each year for winter operations to improve road safety during winter storms. However, most weather-related vehicle accidents happen on snowy, slushy, or icy surfaces, leading to a significant number of fatalities and injuries annually. Traditionally, transportation agencies rely on the information provided by Road Weather Information Systems for monitoring road conditions along roadways. However, these systems are costly and only provide estimates at …
Performance Of Percussion Driven Earth Anchors For Riverbank Slope Stabilization: Comprehensive Laboratory And Field Studies, Natnael Tilahun Asfaw
Performance Of Percussion Driven Earth Anchors For Riverbank Slope Stabilization: Comprehensive Laboratory And Field Studies, Natnael Tilahun Asfaw
Civil Engineering Dissertations - Archive
ABSTRACT: The unpredictability of the stability of embankment slopes is a recurring problem that threatens the safety of the traveling public, as it compromises the integrity of the structures built on them. Slopes that undergo seasonal variations of stream flow are of particular concern, as they are usually located under a bridge structure that spans a stream, and the meandering of the stream flow, the seasonal variations of the flow depth, and the velocity in the channel induce scouring and increase the risk of the bridge failing. Departments of transportation have long attempted to address these concerns by designing systems …
Formal Processes For Inspecting Bridge Deck Drains Using Lidar And Photogrammetry, Ahmad Kamal Bani Hani
Formal Processes For Inspecting Bridge Deck Drains Using Lidar And Photogrammetry, Ahmad Kamal Bani Hani
Civil Engineering Dissertations - Archive
ABSTRACT: Poor-performing bridge deck drains result in water standing on the bridge deck. The standing water threatens the safety of bridge users and deteriorates bridge structural elements. Bridge deck drains are only inspected biennially, and they do not impact the bridge rating established from inspections. Furthermore, literature shows that visual inspection results are sometimes skewed due to human errors. In this regard, a part of this research was conducting a survey study to help identify the problems with deck drains to help transportation agencies minimize the consequences of poor drainage. Another part of this research was to create a convolutional …
Testing And Evaluation Of Polymeric Spray Applied Pipe Lining In Pressure Pipe Applications, Kawalpreet Kaur
Testing And Evaluation Of Polymeric Spray Applied Pipe Lining In Pressure Pipe Applications, Kawalpreet Kaur
Civil Engineering Dissertations - Archive
Pressure pipes are an important component of pipe infrastructure for water mains, distribution lines, fuel and gas piping, process piping, building services piping, and many more. Various material types are available to be used in the pressure pipes, in which metal pipes are ubiquitous for high pressure applications, plastic pipes are also commonly used, and sometimes concrete pressure pipes are used in large diameter pipes for its economic factors. Most of these pipes currently in service are 50 to 60 years old, and some are 100 years old. Furthermost pipelines have exceeded their design life and are continuously deteriorating to …
Performance Evaluation Of The Modified Moisture Barrier In Stabilizing Shallow Slope Failures, Muhasina Manjur Dola
Performance Evaluation Of The Modified Moisture Barrier In Stabilizing Shallow Slope Failures, Muhasina Manjur Dola
Civil Engineering Dissertations - Archive
Each year significant number of highway slope failures are reported in the United States, especially in states like Texas where expansive clayey soil is prevalent. Slopes constructed over expansive clay often experience recurring shallow failures following their construction which poses maintenance problems to the Texas Department of Transportation (TxDOT). These shallow slope failures can be primarily attributed to the considerable volume change that expansive clay soil undergoes from seasonal climatic variation. Furthermore, under unsaturated conditions during dry periods, high matric suction (i.e., negative porewater pressure) exists in soil slopes. The existence of matric suction contributes to the shear strength of …
Study Of The Impact Of Atmospheric Variability On Subsurface Methane Emissions: Application To Leak Detection And Quantification For Underground Natural Gas Pipeline Leaks, Shanru Tian
Civil Engineering Dissertations - Archive
Natural gas (NG), taken as a bridging fuel for achieving a low-carbon future, has rapidly grown to be a significant component of the global energy system and requires extensive pipeline infrastructures, most of them buried underground. Fugitive methane (CH4) emissions from NG pipeline leaks pose environmental, safety, and economic threats to the public. An effective leak detection and quantification (LDAQ) survey method is critical to identifying a leak and assessing the size when it has occurred, thus initiating appropriate response actions to repair it and accounting for the environmental risks accurately. However, gaps exist between LDAQ survey methods, and the …
Investigation Of Models To Predict The Remaining Useful Life Of Prestressed Concrete Cylinder Pipe, Ahmad Mahmoud Jibreen
Investigation Of Models To Predict The Remaining Useful Life Of Prestressed Concrete Cylinder Pipe, Ahmad Mahmoud Jibreen
Civil Engineering Dissertations - Archive
The water distribution system in the United States consists of 2.2 million miles of pipelines with water main breaks that the American Society of Civil Engineers (ASCE) 2021 Report Card estimated results in six billion gallons of drinking water lost daily. Detecting the state of pipeline deterioration should always be a top priority in the water pipeline industry This dissertation statistically evaluates data from more than 70,000 electromagnetic inspections that have been performed since the installation of these pipes in 1971. The scope of this dissertation is related to performance and degradation of prestressed concrete cylinder pipe (PCCP) which is …
Finite Element Approach On Minimization Of Cracks At I-Girder Ends Induced By Prestress, Sangit Rauniyar
Finite Element Approach On Minimization Of Cracks At I-Girder Ends Induced By Prestress, Sangit Rauniyar
Civil Engineering Dissertations - Archive
Prestressed I-girders are one of the very commonly and widely used girders for bridges. It is produced at precast plant and transported to bridge site. To produce a prestressed I-girder, strands are first pulled and concrete is poured in I-girder’s formwork. Once the concrete reaches a desired strength, strands are released which induce prestress in I-girder. There are mainly two types of design for I-girders-one that requires debonding of strands at the end of I-girders and another that requires harping of strands at the end of I-girders. The debonding and harping of strands are done to reduce tension at the …