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Articles 91 - 120 of 699

Full-Text Articles in Civil and Environmental Engineering

Evaluation Of A First Flush System With Multiple In-Line Bypassing Fuel Separator Components In The Industrial Area Of An Airport, Kazi Rashid Aug 2023

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 …

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The Impact Of Improper Solid Waste Management On Public Health Of African Cities. The Case Of Addis Ababa City, Ethiopia., Tesfaye Abebe Alemu Aug 2023

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 …

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The Road Map For Sustainable Waste Management In The Federal Democratic Republic Of Ethiopia, Assegid Yimenu Aug 2023

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 …

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Effect Of Impurities In Plastic Waste On The Performance Of Plastic Road, Niloy Gupta Aug 2023

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 …

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Analysis Of The Impact Of Covid-19 On Construction Cost And Schedule Overruns, Nikhitha Adepu Aug 2023

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 …

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Dynamic Response Of Cohesive-Frictional Soils Under Thermo-Controlled Constant Water Content Cyclic Simple Shear Testing, Daniel Robert Green Aug 2023

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 …

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Cement-Based Nanocomposites With Tunable Electrical And Thermal Conductivity, Myrsini Maglogianni Aug 2023

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 …

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Investigation On The Impacts Of Land Subsidence And Urbanization On Flood Inundation In Texas, Han Jiang Aug 2023

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 …

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An Integrated Algorithm For Automatic Gpr Data Processing For Concrete Rebar Location, Lihong Mao Aug 2023

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 …

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Digital Twin Enabled Winter Operations Management Through The Integration Of Artificial Intelligence, Sensory Level Data, And Publicly Available Data, Pooya Darghiasi Aug 2023

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 …

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An Accelerated Corrosion Test Method For Pre-Cracked Reinforced Concrete, Shahriar Abed Aug 2023

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 …

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Exploring Spatial Associations And Complex Interactions Between Geotechnical Properties And Electrical Resistivity Values In Clayey Soils, Mina Zamanian Aug 2023

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 …

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Analyze The Effect Of Urbanization And Development Over The Flow Regime And River Channel Hydraulics Of The Big Bear Creek Channel, Machiraju Pakasasana Kashyap May 2023

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 …

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Performance Of Percussion Driven Earth Anchors For Riverbank Slope Stabilization: Comprehensive Laboratory And Field Studies, Natnael Tilahun Asfaw May 2023

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 …

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Optimization Of Primary Chemical Feed Rates And Application Points At An Existing Potable Water Treatment Plant, Brently Keith Jordan May 2023

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 …

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Use Of Smartphone Apps While Driving: Variations On Driving Performances, Perceived Risks And Behaviors, Juana Perez May 2023

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 …

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Formal Processes For Inspecting Bridge Deck Drains Using Lidar And Photogrammetry, Ahmad Kamal Bani Hani May 2023

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 …

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Application Of Photogrammetry For Monitoring Soil Surface Movement, Arjan Poudel May 2023

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 …

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Performance Evaluation Of The Modified Moisture Barrier In Stabilizing Shallow Slope Failures, Muhasina Manjur Dola Dec 2022

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 …

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Development Of A Decesion Tree To Rehabilitate Or Replace The St. Francis Bridge Over Ih-30, Md Farhan Abir Dec 2022

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 …

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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 Dec 2022

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 …

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Investigation Of Models To Predict The Remaining Useful Life Of Prestressed Concrete Cylinder Pipe, Ahmad Mahmoud Jibreen Dec 2022

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 …

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Finite Element Approach On Minimization Of Cracks At I-Girder Ends Induced By Prestress, Sangit Rauniyar Dec 2022

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 …

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Improving The Analysis And Prediction Of Coastal Flooding During Hurricane Landfalls Through Coupled And Integrated Modeling, Md Arifur Rahman Dec 2022

Improving The Analysis And Prediction Of Coastal Flooding During Hurricane Landfalls Through Coupled And Integrated Modeling, Md Arifur Rahman

Civil Engineering Dissertations - Archive

ABSTRACT: As the intensity and frequency of landfalling tropical storms are likely on the rise in a warming climate, coastal communities are increasingly being exposed to flooding caused by storm surges compounded by heavy rainfall. Prediction and reanalysis of storm surges, especially compound flooding, rely on wind and pressure fields either from parametric tropical cyclone wind models or numerical weather model reanalysis. Both are subject to significant errors during landfall. Besides, land surface attributes and different storm structures influence the intensity and location of compound flooding in coastal areas. Therefore, this dissertation aims to improve the analysis and prediction of …

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Performance Evaluation Of Recycled Plastic Pins In Two Layers To Stabilize Deep Slope Failures, Sachini Madanayake Dec 2022

Performance Evaluation Of Recycled Plastic Pins In Two Layers To Stabilize Deep Slope Failures, Sachini Madanayake

Civil Engineering Dissertations - Archive

Slope failures are a common occurrence in highway embankments throughout Texas due to the presence of high plastic clays with expansive behavior. Although shallow slope failures are prevalent, slope failures extending deeper into the slope occur due to the development of micro and macro cracks. The cracks facilitate the infiltration of rainwater deeper into the slope over time. Slope failures incur thousands of dollars’ worth of repairs every year for transportation departments across the country. Recycled Plastic Pins (RPP) have been identified as an effective, cost efficient, and sustainable solution to stabilize shallow failures. The resistance of RPP is mobilized …

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Evaluation Of Relationship Between Sulfate Content And Electrical Resistivity, Zobair Ahmed Dec 2022

Evaluation Of Relationship Between Sulfate Content And Electrical Resistivity, Zobair Ahmed

Civil Engineering Theses - Archive

Texas soils typically have sulfate content due to certain geologic formation types. Soil sulfate needs to be identified and quantified to minimize damage to infrastructure caused by sulfate-induced heave. Electrical Resistivity Imaging can identify the presence of sulfate content in the soil. Electrical Resistivity Imaging (ERI) is a non-destructive and fast way of obtaining continuous soil substructure profiles. Moisture fluctuations and soil heterogeneities can be found using an ERI approach. As a result, ERI is growing in popularity as a tool in geotechnical engineering, yet at the moment, it only offers qualitative data. It can be challenging to determine quantitative …

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Numerical Simulation Of Hydrodynamic Forces On Riverine And Coastal Bridges Subjected To Extreme Weather Events, Fahad Pervaiz Dec 2022

Numerical Simulation Of Hydrodynamic Forces On Riverine And Coastal Bridges Subjected To Extreme Weather Events, Fahad Pervaiz

Civil Engineering Dissertations - Archive

ABSTRACT: Recent bridge failures due to hurricane-generated storm surges and riverine flood events have highlighted the vulnerability of bridge infrastructure to extreme hydrodynamic loading. In addition to posing an immediate risk to human life, bridge failures can hinder evacuation planning and emergency response efforts. Changes in flood frequency and intensity due to climate change and urbanization may alter the hydrodynamic conditions along urban streams, further stressing bridge infrastructure designed based on historical flow conditions. As a result, quantifying the structural response and stability of bridges under current and future hydrodynamic conditions is crucial to improving transportation safety and efficiency. This …

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Microplastic Risk Characterization Of Plastic Road, Md Shams Razi Shopnil Dec 2022

Microplastic Risk Characterization Of Plastic Road, Md Shams Razi Shopnil

Civil Engineering Dissertations - Archive

In recent past, the act of waste recycling has been diversified in manifolds across the world leading to evolution of newer recycling technique and fresh recycled product. Albeit plastic is one of those waste materials which is getting extremely difficult to get substantially recycled because of its record-breaking production, consumption, and its wide range of variations in properties ultimately leading to substandard recycling status of plastics globally. This seemingly poor status of waste plastics recycling against the gargantuan amount of fresh plastic products being added to consumer stream gives rise to a menacing one directional problem: Plastic Pollution, which is …

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Reuse Of Recycled Plastic For Subgrade Treatment, Jerin Tasnim Dec 2022

Reuse Of Recycled Plastic For Subgrade Treatment, Jerin Tasnim

Civil Engineering Theses - Archive

Disposal of solid waste becomes a global issue due to it contains a large amount of non- degradable polymers and may lead to many environmental issues. With the scarcity of space for landfilling and due to ever increasing cost, finding ways to handle these wastes without endangering the environment is crucial. One of these methods is to use plastic wastes as one of the pavement materials. In this study, a new method of subgrade soil stabilization of pavement is proposed where soil will be stabilized by mixing only plastic with soil for the treatment of subgrade. In order to demonstrate …

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Multisorb: A Low-Cost Approach To Remove Multiple Metals And Organics From Leachate And Wastewater, Mithila Chakraborty Aug 2022

Multisorb: A Low-Cost Approach To Remove Multiple Metals And Organics From Leachate And Wastewater, Mithila Chakraborty

Civil Engineering Dissertations - Archive

ABSTRACT: Landfill leachates are considered now as a reusable source of water. Even irrigation projects are now considering use of non-traditional water sources, including treated wastewater, to augment supplies. Treated wastewater or leachate, however, may still contain many inorganic and organic pollutants of emerging concern, because traditional wastewater treatment plants are unable to remove all of them. Adsorbents have been demonstrated to effectively remove heavy metals and recalcitrant organics from leachate/wastewater more effectively, at lower cost, and using less chemicals and energy than many competing techniques. A single adsorbent with one pre-treatment, however, is not effective for simultaneously removing different …

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