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Articles 91 - 120 of 677
Full-Text Articles in Civil Engineering
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 …
Improving The Analysis And Prediction Of Coastal Flooding During Hurricane Landfalls Through Coupled And Integrated Modeling, Md Arifur Rahman
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 …
Performance Evaluation Of Recycled Plastic Pins In Two Layers To Stabilize Deep Slope Failures, Sachini Madanayake
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 …
Evaluation Of Relationship Between Sulfate Content And Electrical Resistivity, Zobair Ahmed
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 …
Numerical Simulation Of Hydrodynamic Forces On Riverine And Coastal Bridges Subjected To Extreme Weather Events, Fahad Pervaiz
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 …
Microplastic Risk Characterization Of Plastic Road, Md Shams Razi Shopnil
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 …
Reuse Of Recycled Plastic For Subgrade Treatment, Jerin Tasnim
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 …
Multisorb: A Low-Cost Approach To Remove Multiple Metals And Organics From Leachate And Wastewater, Mithila Chakraborty
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 …
Design Of Crack Attenuating Mix Using Waste Plastic, Shruti Singh
Design Of Crack Attenuating Mix Using Waste Plastic, Shruti Singh
Civil Engineering Dissertations - Archive
Plastic has many good properties such as inexpensiveness, light weightedness and durability, but it comes with one major catch i.e., its ‘indestructibility’. Plastic waste is now omnipresent and highlights that all plastic ever produced still exists in some shape or form either as macro, micro or nano plastics, making it one of the greatest challenges our planet is facing today. At the same time many existing pavements are experiencing structural and functional deficiencies due to rapid growth in traffic volume. This has led to an ever-increasing rise in construction and rehabilitation cost. So, an alternative has been explored through this …
Identifying The Optimal Combination Of Critical Roadside Slope Segments Susceptible To Rainfall-Induced Failures For Minimizing Vulnerability Of Highway Networks, Anil Baral
Civil Engineering Dissertations - Archive
The stability of roadside slopes is vital for the smooth operation of the highway transportation system. The failure of slopes adjacent to the highway corridors adversely impacts the network users and network operators. The network users are subjected to delays through speed restrictions, stoppage, and diversions due to the blockage of a motorway. The network operators face the burden of implementation and finance of emergency slope repairs. Proactive rehabilitation of slopes helps to reduce roadside slope failures and minimize the disruption of transportation networks resulting from rainfall-induced slope failures. However, all the slope segments susceptible to rainfall-induced failures cannot be …
Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla
Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla
Civil Engineering Dissertations - Archive
This thesis concerns the unique flow structure around bridge piers under the wave and current conditions. The flow characteristics around piers may change depending on the flow conditions and geometry of the pier. These flow structures imprint themselves on the streambed as scour holes. Laboratory experiments were conducted to investigate the changes that occur in the flow pattern and in the geometric pattern of scour holes around piers in waterbodies subject to waves and currents. Physical models of two piers with different diameters (19 mm and 50 mm) were built and installed in a sediment bed. A total of 19 …
Integrating Environmental Contamination Perceptions Of Artisanal And Small-Scale Mining Into Environmental Responses Across Spatial Scales, Michelle Schwartz
Integrating Environmental Contamination Perceptions Of Artisanal And Small-Scale Mining Into Environmental Responses Across Spatial Scales, Michelle Schwartz
Civil Engineering Dissertations - Archive
ABSTRACT: Artisanal and small-scale gold mining (ASGM) is of significant interest to the international research community, government officials, and non-governmental organizations due to its large environmental footprint and its presence in over 70 countries worldwide. Despite the health and environmental concerns associated with mercury use in ASGM and the increased awareness at the international level, attempts to address environmental contamination has faced resistance as they often fail to account for the real-world conditions at sites of concern. Additionally, national and international interventions have fallen short when addressing ASGM pollution, calling for a new engineering approach towards ASGM-related projects. The purpose …
Development Of Multi Criteria Decision-Making Model To Evaluate The Adoption Effectiveness Of Electronic Ticketing (E-Ticketing) In Highway Construction Projects, Karthik Subramanya
Development Of Multi Criteria Decision-Making Model To Evaluate The Adoption Effectiveness Of Electronic Ticketing (E-Ticketing) In Highway Construction Projects, Karthik Subramanya
Civil Engineering Dissertations - Archive
Highway and bridge construction projects are subject to cost and schedule overruns, as well as workforce shortages in remote locations, both of which can result in disputes over the quality of the end product. State departments of transportation (DOTs) are constructing and managing more highway projects than ever before despite limited funds and a shortage of inspectors. The construction of highway infrastructure has devoted significant resources towards e-Construction to reduce the paperwork and automate the tasks in daily operations. Electronic Ticketing (e-Ticketing) is one such component of e-Construction that aids in the digital transfer of material tickets such as asphalt …
Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla
Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla
Civil Engineering Theses - Archive
This thesis concerns the unique flow structure around bridge piers under the wave and current conditions. The flow characteristics around piers may change depending on the flow conditions and geometry of the pier. These flow structures imprint themselves on the streambed as scour holes. Laboratory experiments were conducted to investigate the changes that occur in the flow pattern and in the geometric pattern of scour holes around piers in waterbodies subject to waves and currents. Physical models of two piers with different diameters (19 mm and 50 mm) were built and installed in a sediment bed. A total of 19 …
Sustainable And Inclusive Engineering: The Use Of Mentors And Sustainable Remediation To Increase The Presence Of Underrepresented Groups In Engineering, Nathaniel L. Steadman
Sustainable And Inclusive Engineering: The Use Of Mentors And Sustainable Remediation To Increase The Presence Of Underrepresented Groups In Engineering, Nathaniel L. Steadman
Civil Engineering Theses - Archive
The recruitment and retention of underrepresented groups in engineering, such as women, has been a priority for many decades to diversify the profession to meet the current demand for engineers. Unfortunately, barriers continue to inhibit the recruitment and retention of underrepresented students in engineering, thus reducing the impact of these efforts. A potential barrier is a lack of social connection to the technical problem definition, design, and decision-making that engineers utilize, prioritizing technical knowledge over social. Previous research has theorized that the incorporation of social considerations in technical engineering design increases interest in engineering for underrepresented groups. The purpose of …
An Experimental Investigation Of Icephobicity And Hydrophobicity Of Concrete Surface Treated With Pavix, Hussein Hashemi Senejani
An Experimental Investigation Of Icephobicity And Hydrophobicity Of Concrete Surface Treated With Pavix, Hussein Hashemi Senejani
Civil Engineering Theses - Archive
High ice adhesion is a significant problem in several industries. The majority of practical issues brought on by ice adhesion are still not fully resolved, and the ice-adhesion mechanism is still poorly understood. Ice adhesion is a complex phenomenon that becomes more intricate when salt is involved, as in many marine cases. Reducing ice adhesion by generating hydrophobic surfaces might be advantageous in many applications as a passive ice removal strategy. Lowering adhesion may reduce friction, abrasion, and damage to structures in a maritime environment, as well as any surface prone to ice development. This process may also be utilized …
Thermal Properties Of Water Repellent Sands: Experimental And Theoretical Evaluation, Gang Lei
Thermal Properties Of Water Repellent Sands: Experimental And Theoretical Evaluation, Gang Lei
Civil Engineering Dissertations - Archive
ABSTRACT: Unsaturated hydrophobic soils, induced by the decomposition of plant roots or chemical or oil contamination et al., may have potentially negative effects on soil thermal behaviors and further influence the performance of shallowly buried energy systems, including ground heat exchangers, borehole energy geo-storage systems, and buried power cable systems, etc. This research focused on the fundamental understanding of soil thermal behaviors in relation to surface wettability. Surface wettability alteration was conducted in the laboratory by applying dimethyldichlorosilane (DMDCS) on dry sands, which generated a thin hydrophobic layer on the sand particle surface. Several surface characterizations using scanning electron microscopy …
A Sustainable And Equitable Transportation System Design Under Connected Vehicle And Big Data Driven Environment, Farzana Rahman Chowdhury
A Sustainable And Equitable Transportation System Design Under Connected Vehicle And Big Data Driven Environment, Farzana Rahman Chowdhury
Civil Engineering Dissertations - Archive
As the population increases day by day, several cities are having trouble dealing with the increasing demand for a sustainable and equitable transportation system. At the same time, application of newer technology is also increasing . By definition, a sustainable transportation system indicates a method that includes the needs of each individual road user and mode of transportation. A sustainable transportation system also supports the compatibility of the system with the change in demand, regional development, and available resources. In a sustainable and equitable transportation system, integrating the virtual world and the physical world is crucial since it makes the …
Model Development For User Behavior While Adopting Autonomous Vehicles As Their On-Demand Transportation Mode, Ronik Ketankumar Patel
Model Development For User Behavior While Adopting Autonomous Vehicles As Their On-Demand Transportation Mode, Ronik Ketankumar Patel
Civil Engineering Dissertations - Archive
Shared autonomous vehicles (SAVs) are a new technology that allows passengers to skip hailing a cab using a smartphone app to summon an autonomous shuttle that does not require a human operator. SAVs are anticipated to improve the efficiency, mobility, safety, and affordability of transportation systems. However, consumers will determine the success of SAV technology. Researchers have studied the associations between individuals' attitudes, preferences, and adoption of self-driving services focusing mainly on potential riders with no actual ridership experience. However, the literature lacks empirical assessments of riders' adoption and acceptance of SAVs. Therefore, this study aims to develop two models …
Data Fusion For Non-Motorized Volume Estimation: A Machine Learning Approach, Md. Mintu Miah
Data Fusion For Non-Motorized Volume Estimation: A Machine Learning Approach, Md. Mintu Miah
Civil Engineering Dissertations - Archive
ABSTRACT: Despite increased awareness at the state and federal levels of the design and policy concerns associated with nonmotorized infrastructure, communities typically develop strategies to estimate network-wide nonmotorized traffic. However, past research fails to provide the same level of estimation sophistication as motor vehicles due to a lack of investment, which limits increased understanding and capability among communities in network-wide nonmotorized traffic volume estimation. Although previous studies introduce machine learning, Neural Networks, and feature engineering to motorized traffic volume estimation, nonmotorized traffic estimation experiences limited attempts to use these advanced techniques. This dissertation addresses this deficiency in bicycle volume estimation …
Physical And Mental Health Challenges Of Construction Workforce Active In Extreme Weather Conditions, Sanjgna Karthick
Physical And Mental Health Challenges Of Construction Workforce Active In Extreme Weather Conditions, Sanjgna Karthick
Civil Engineering Dissertations - Archive
Construction sites continue to operate despite inclement weather, exposing workers to unpleasant working circumstances that can lead to various physical and mental health challenges. A thorough literature review yielded 21 challenges for hot weather conditions such as heat stroke, kidney disease, heat cramps, anxiety, depression and 20 challenges for cold weather conditions like asthma, frostbite, Musculo-Skeletal disorders, hallucination. Workers vulnerable to hot and cold weather based on demographic characteristics were identified. The study also provides 27 strategies to address the challenges experienced in hot and cold weather conditions. Some of these include ensuring that workers stay hydrated, scheduling sufficient rest …
Performance Evaluation And Retrofitting Options Of A Precast Prestressed Concrete Bridge With Deck Panel Failure, Ahmed Abdullah Alateeq
Performance Evaluation And Retrofitting Options Of A Precast Prestressed Concrete Bridge With Deck Panel Failure, Ahmed Abdullah Alateeq
Civil Engineering Dissertations - Archive
Bridges play a crucial role in the worldwide transportation infrastructure. According to the 2021 America’s Infrastructure Report Card, there are more than 617,000 bridges across the Nation, of which, 42% are at least 50 years old, and 7.5% are rated as structurally deficient. Repetitive loading from heavy trucks is one of the reasons that could compromise the structural integrity of bridges. The heavy trucks have a negative impact on the bridge deck as a bridge’s first line of defense is to resist the applied load. The Las Lomas Bridge [Eastbound (EB) and Westbound (WB)] carrying IH-20 over Las Lomas Pkwy, …
Developing A Lagrangian Sediment Transport Model For Natural Streams, Saman Baharvand
Developing A Lagrangian Sediment Transport Model For Natural Streams, Saman Baharvand
Civil Engineering Dissertations - Archive
Sediment transport in natural streams is a complex process that can significantly affect the stream’s water quality, ecosystem, and morphology. Suspended sediment concentrations can adversely affect the health of the ecosystem and aquatic species, and the deposited sediment particles can change the morphology and have irreparable environmental impacts. Several numerical models that can be used to manage and mitigate the adverse effects of sediment released into rivers by natural or anthropogenic activities have been developed to estimate the sediment and pollutant transport in waterbodies. However, the goal of the research for this thesis was to develop a Lagrangian stochastic sediment …
Evaluation Of Decision-Making Prediction Models For Sewer Pipes Asset Management, Salar Shirkhanloo
Evaluation Of Decision-Making Prediction Models For Sewer Pipes Asset Management, Salar Shirkhanloo
Civil Engineering Dissertations - Archive
Wastewater collection systems deteriorate over time, requiring continuous adjustments and the development of asset management frameworks on the part of utility owners to maintain the performance of their assets. Any asset management framework should emphasize the importance of asset inspection and condition evaluation for efficient system operation and maintenance. Closed-circuit television (CCTV) is the most widely used tool in the United States for inspecting the interior of sewer pipes, which is a somewhat expensive and time-consuming process given the extensive inventory of pipes in a city. Due to their vast inventory of these pipes, no municipality can inspect every individual …
Hydrodynamic Forces On Stream-Crossing Bridges – Consideration Of Flow Parameters, Bridge Geometry, And Debris, Shah Md Imran Kabir
Hydrodynamic Forces On Stream-Crossing Bridges – Consideration Of Flow Parameters, Bridge Geometry, And Debris, Shah Md Imran Kabir
Civil Engineering Dissertations - Archive
ABSTRACT: This thesis examines the interaction of flood flow with bridge superstructures by considering the effects of the flow parameters, bridge geometry, debris, and bridge substructures. The hydrodynamic forces are expressed by using force and moment coefficient charts to portray the effect of bridge submersion, bridge position with respect to the channel bed, flood velocity, and bridge geometry. Of the 580,000 bridges in the United States, 83% span streams and rivers that may subject them to floods and debris loads. Although bridges are designed to withstand hydrodynamic forces, the most frequent causes of failure are attributed to hydraulic events, including …
Asset Management Of Wastewater Interceptors Adjacent To Bodies Of Water, Mohammad Bani Fawwaz
Asset Management Of Wastewater Interceptors Adjacent To Bodies Of Water, Mohammad Bani Fawwaz
Civil Engineering Dissertations - Archive
This dissertation presents the viability of managing a pipeline network adjacent to bodies of water to maximize asset life by evaluating the significant factors that affect the condition levels of pipeline assets. Pipeline asset management derives from pipelines’ physical conditions, condition rating, and serviceability through testing, monitoring, and analyzing rupture history. The remaining asset life and structural condition of the pipeline network running near and under bodies of water are often hard to predict. In case of pipeline failure, exuberant damages will occur to the surrounding environment, adding up to disruption in service and repairing costs. This research develops Multinomial …
Quantitative Non-Destructive Evaluation Of Rebar Corrosion In Concrete, Khadiza Binte Jalal
Quantitative Non-Destructive Evaluation Of Rebar Corrosion In Concrete, Khadiza Binte Jalal
Civil Engineering Dissertations - Archive
ABSTRACT: Corrosion of rebar is considered the leading cause of deterioration in concrete structures. When steel rust, it occupies larger volume and creates pressure on the concrete, leading to cracking and spalling. As the cross-section is being compromised, the structural capacity of the reinforced concrete structure is reduced. Corrosion is a slow natural electrochemical process that affects the long-term performance. However, sometimes premature catastrophic failure occurs due to corrosion, especially in chloride environments. Moreover, the cost of repair and replacement of deteriorated structures has become a major liability for management agencies. Consequently, it is important to determine the level of …
Role Of Binder Compositions And Carbonate Polymorphs On The Performance Of Carbonation Activated Cementitious Composites, Mohammad Rakibul Islam Khan
Role Of Binder Compositions And Carbonate Polymorphs On The Performance Of Carbonation Activated Cementitious Composites, Mohammad Rakibul Islam Khan
Civil Engineering Dissertations - Archive
The most energy-intensive manufacturing industry in the US is the Ordinary Portland Cement (OPC) industry. This industry is responsible for 5-8% of global CO2 emissions caused by humans. The calcination of limestone to produce high lime calcium silicate and high manufacturing temperature (1450°C) are responsible for this significant amount of CO2 emissions. This CO2 footprint of the cement-based composites can be decreased by utilizing cementitious materials with low-lime calcium silicate. Low-lime calcium silicates are typically semi-hydraulic or non-hydraulic. As a result, it is necessary to activate those materials in order to increase their reactivity. Alkali activators, carbonation curing (CO2 curing), …
Rainfall-Induced Slope Failure – An Early Warning System, Md Aminul Islam
Rainfall-Induced Slope Failure – An Early Warning System, Md Aminul Islam
Civil Engineering Dissertations - Archive
Globally, slope failures cause substantial death tolls and economic loss. Embankments constructed on high plasticity clay are vulnerable to cyclic swelling and shrinkage when subjected to climate. Thus, over time, soil softens and reduces effective shear strength, and shrinkage cracks on slopes can act as pathways for rainfall infiltration, which increases pore water pressure and lowers the shear strength below critical levels, resulting in slope failure. This study aims to develop early warning criteria for rainfall-induced slope failure. Study areas were Tarrant, Dallas, Johnson, and Ellis, where soil types and a humid subtropical climate result in frequent slope failures. The …
Assessment Of Stormwater Infrastructure For Mitigating Flooding And Non-Point Source Pollution, Helia Farzaneh
Assessment Of Stormwater Infrastructure For Mitigating Flooding And Non-Point Source Pollution, Helia Farzaneh
Civil Engineering Theses - Archive
Flooding is the top natural hazard impacting coastal and inland communities in Texas. Beyond its destructive impact on rising waters in communities, flooding-induced stormwater negatively affects the quality of large bodies of water. Stormwater runs over land, washes off pollutants, and deposits them into rivers which causes water quality issues in bays and estuaries. In addition, the stormwater increases nutrients, sediments, oxygen-demanding substances, pathogens, and toxins which results in hypoxia in the aquatic system. During the last 5-6 years, severe storm events such as Tropical Storm Beta (September 2020), Tropical Storm Imelda (September 2019), Hurricane Harvey (August 2017) have caused …