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Articles 61 - 90 of 677
Full-Text Articles in Civil Engineering
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 …
Estimation Of Suspended Sediment Concentration Along The Lower Brazos River Using Satellite Imagery And Machine Learning, Trevor Stull
Estimation Of Suspended Sediment Concentration Along The Lower Brazos River Using Satellite Imagery And Machine Learning, Trevor Stull
Civil Engineering Theses - Archive
ABSTRACT: Suspended sediment transport in river basins is important for many water management planning activities to maintain safe drinking water for the community and maintenance of water quality and waterways for the ecosystem. Currently, the traditional way to measure suspended sediment effectively and reliably is by collecting field samples in the river body, which is very time consuming and only provide a point value of suspended sediment within the waterbody at the instant the sample was taken. This thesis focuses on developing models that estimate suspended sediment concentrations for the lower Brazos River using satellite imagery from publicly available data …
Comparative Mechanical Property Evaluation Of Ultra-High-Performance Concrete Reinforced With High-Strength Steel Straight And Hooked Fibers, Sujan Kumar Singh
Comparative Mechanical Property Evaluation Of Ultra-High-Performance Concrete Reinforced With High-Strength Steel Straight And Hooked Fibers, Sujan Kumar Singh
Civil Engineering Theses - Archive
This study investigates the tensile properties and ductility of ultra-high-performance concrete (UHPC) reinforced with high-strength steel hooked fibers with a tensile strength of 445 ksi (3,070 MPa) and compares its tensile performance to that of UHPC reinforced with commonly used high-strength smooth steel microfibers with a tensile strength of 2,160 MPa (313 ksi). The research is based on a proprietary mix developed at the University of Texas at Arlington and investigates the mechanical properties of UHPC with varying fiber volume fractions of 1.5%, 2%, 2.25%, and 2.4%. The experimental results indicate that UHPC reinforced with high strength hooked fibers generally …
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 …
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 …
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 …
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 …
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 …
Analyze The Effect Of Urbanization And Development Over The Flow Regime And River Channel Hydraulics Of The Big Bear Creek Channel, Machiraju Pakasasana Kashyap
Analyze The Effect Of Urbanization And Development Over The Flow Regime And River Channel Hydraulics Of The Big Bear Creek Channel, Machiraju Pakasasana Kashyap
Civil Engineering Theses - Archive
This thesis focuses on investigating the influence of urbanization and development on flow regime and river channel hydraulics in the Bear Creek watershed, Texas using a comprehensive set of hydrologic and 1D/2D coupled hydraulic model. The Bear Creek watershed, located in North Texas, has experienced rapid urbanization and land development in recent years, raising concerns about the potential impacts on hydrological processes and the hydraulic behavior of the river system. To address these concerns, this research utilizes an integrated modeling approach, combining the HEC-HMS and HEC-RAS software tools, to assess changes in flow rates and simulate their effects on river …
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 …
Optimization Of Primary Chemical Feed Rates And Application Points At An Existing Potable Water Treatment Plant, Brently Keith Jordan
Optimization Of Primary Chemical Feed Rates And Application Points At An Existing Potable Water Treatment Plant, Brently Keith Jordan
Civil Engineering Theses - Archive
Due to a major upset in the treatment processes for the Dallas County Park Cities Municipal Utility District caused by a required change in treatment techniques, an optimization study was conducted to find the best treatment strategies for the primary coagulation, flocculation, and settled processes for the treatment plant. A methodology for determining how to optimize jar testing while injecting both ferric sulfate and calcium hydroxide in an almost simultaneous manner was developed, and a large number of jar tests were conducted to determine both the best dosages and the best application points of the two chemicals. As a result …
Use Of Smartphone Apps While Driving: Variations On Driving Performances, Perceived Risks And Behaviors, Juana Perez
Use Of Smartphone Apps While Driving: Variations On Driving Performances, Perceived Risks And Behaviors, Juana Perez
Civil Engineering Theses - Archive
ABSTRACT: Distracted driving increases the crash frequencies on the road and subsequently leads to fatalities involved with crashes. As technology has evolved, drivers are continuously exposed to newer technology in their vehicles and applications in their phones, which has led to technology representing one of the main secondary tasks that distract drivers on the road. The impact of technology-involved distraction appears to be different by the type of distraction since a secondary task that can be exceedingly distracting to the driver causes more reckless and risky driving. Moreover, the impact of distracted driving may differ by roadway geometries since distracted …
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 …
Application Of Photogrammetry For Monitoring Soil Surface Movement, Arjan Poudel
Application Of Photogrammetry For Monitoring Soil Surface Movement, Arjan Poudel
Civil Engineering Theses - Archive
Understanding slope behavior and forecasting failure requires accurate soil surface movement measurements. Research gaps and constraints remain despite the development of diverse methods. Recently, photogrammetry has become a promising method for detecting soil surface movement. This method involves setting coded targets and ground points on the soil surface, taking photographs before and after the movement, and using photogrammetric software to measure accurately. However, past studies have mostly used high-end cameras with excellent resolution and geotagging, which may not have been available in all contexts. Thus, this study compares the accuracy and precision of geotechnical soil surface measurement with a consumer-grade …
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 …
Development Of A Decesion Tree To Rehabilitate Or Replace The St. Francis Bridge Over Ih-30, Md Farhan Abir
Development Of A Decesion Tree To Rehabilitate Or Replace The St. Francis Bridge Over Ih-30, Md Farhan Abir
Civil Engineering Theses - Archive
ABSTRACT: The ASCE infrastructure report card indicated that about 42% of the nation’s bridges are over 50 years old, and 7.5% of the bridges are structurally deficient. The 61-year-old St. Francis bridge over IH-30 is one of the Texas Department of Transportation (TxDOT) bridges that exhibit significant deterioration in the superstructure, including potholes and delamination in the deck. The bridge was load posted to 28,000 lb. limit and has substandard vertical and horizontal clearances to the bottom chord of the beams and supporting piers, respectively, which creates a high risk for vehicle impact. In 2017, an over-height truck struck the …
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 …