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Articles 1591 - 1620 of 11807

Full-Text Articles in Civil and Environmental Engineering

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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Design Of Crack Attenuating Mix Using Waste Plastic, Shruti Singh Aug 2022

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 …

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Identifying The Optimal Combination Of Critical Roadside Slope Segments Susceptible To Rainfall-Induced Failures For Minimizing Vulnerability Of Highway Networks, Anil Baral Aug 2022

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 …

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Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla Aug 2022

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 …

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Integrating Environmental Contamination Perceptions Of Artisanal And Small-Scale Mining Into Environmental Responses Across Spatial Scales, Michelle Schwartz Aug 2022

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 …

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Development Of Multi Criteria Decision-Making Model To Evaluate The Adoption Effectiveness Of Electronic Ticketing (E-Ticketing) In Highway Construction Projects, Karthik Subramanya Aug 2022

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 …

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Experimental Study Of Flow Characteristics And Geometry Of Scour Hole Around Cylindrical Piers Subject To Wave And Current, Qazi Ashique E Mowla Aug 2022

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 …

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Sustainable And Inclusive Engineering: The Use Of Mentors And Sustainable Remediation To Increase The Presence Of Underrepresented Groups In Engineering, Nathaniel L. Steadman Aug 2022

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 …

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An Experimental Investigation Of Icephobicity And Hydrophobicity Of Concrete Surface Treated With Pavix, Hussein Hashemi Senejani Aug 2022

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 …

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Thermal Properties Of Water Repellent Sands: Experimental And Theoretical Evaluation, Gang Lei Aug 2022

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 …

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A Sustainable And Equitable Transportation System Design Under Connected Vehicle And Big Data Driven Environment, Farzana Rahman Chowdhury Aug 2022

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 …

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Model Development For User Behavior While Adopting Autonomous Vehicles As Their On-Demand Transportation Mode, Ronik Ketankumar Patel Aug 2022

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 …

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Data Fusion For Non-Motorized Volume Estimation: A Machine Learning Approach, Md. Mintu Miah Aug 2022

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 …

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Physical And Mental Health Challenges Of Construction Workforce Active In Extreme Weather Conditions, Sanjgna Karthick Aug 2022

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 …

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Performance Evaluation And Retrofitting Options Of A Precast Prestressed Concrete Bridge With Deck Panel Failure, Ahmed Abdullah Alateeq Aug 2022

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, …

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The Evacuation Simulation Of Wheelchair Users In A Building Fire: An Initial Dynamic Characterization Of Structural Egress Components, Haley Hostetter Aug 2022

The Evacuation Simulation Of Wheelchair Users In A Building Fire: An Initial Dynamic Characterization Of Structural Egress Components, Haley Hostetter

All Theses

People with disabilities are one of the most vulnerable groups involved in building fires. According to the U.S. Fire Administration, in the United States alone, an estimated 700 home fires involve people with physical disabilities each year while over 1700 involve those with mental health disorders. Despite this, the current body of literature shows few studies focused on the evacuation of disabled people. This is a direct result of past and present social injustice on people with disabilities and has resulted in high injury and death rates during fires. To combat this, enrich the literature, and improve their experiences in …

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Inspection Of Flexible Fillers In Post-Tensioned Bridges, Carley Gonzalez Aug 2022

Inspection Of Flexible Fillers In Post-Tensioned Bridges, Carley Gonzalez

Doctoral Dissertations and Master's Theses

The Florida Department of Transportation (FDOT) is currently pushing toward the use of flexible fillers (FF) in new post-tensioned (PT) bridges. Flexible fillers have several advantages compared to the currently used cementitious grouts (CG) and can offer longer-lasting structures by providing better corrosion protection and allowing for replaceable tendons, which reduces the overall maintenance costs over the structure’s lifespan. Due to these fillers being used in new bridges, FDOT needs effective nondestructive evaluation (NDE) methods to employ in their biennial inspections. There are currently numerous NDE methods available to inspectors that have been used to identify defects in PT bridges …

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Developing A Lagrangian Sediment Transport Model For Natural Streams, Saman Baharvand Aug 2022

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 …

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Evaluation Of Decision-Making Prediction Models For Sewer Pipes Asset Management, Salar Shirkhanloo Aug 2022

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 …

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Implementation Of Secondary And Tertiary Treated Wastewater In Concrete Manufacturing, Amany G. Micheal Prof., Haidy Abdel Salam, Gouda Ghanem Aug 2022

Implementation Of Secondary And Tertiary Treated Wastewater In Concrete Manufacturing, Amany G. Micheal Prof., Haidy Abdel Salam, Gouda Ghanem

Civil Engineering

Water scarcity is a problem that faces many regions. In a developing and arid country like Egypt, the need for freshwater is exponentially increasing. This research is an evaluation of the recycled wastewater to be used in concrete manufacturing. The treated wastewater is blended with potable water with percentages of 25%, 50%, and 100%. The mixture of the two types of water is used in concrete mixing and curing. Control specimens with pure potable water are cast for comparison. The setting time for Ordinary Portland Cement is tested using the different water mixes. The hardened concrete is tested in compression …

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Modeling Triaxial Testing With Flexible Membrane To Investigate Effects Of Particle Size On Strength And Strain Properties Of Cohesionless Soil, Thang Pham, Md. Wasif Zaman, Thuy Vu Aug 2022

Modeling Triaxial Testing With Flexible Membrane To Investigate Effects Of Particle Size On Strength And Strain Properties Of Cohesionless Soil, Thang Pham, Md. Wasif Zaman, Thuy Vu

Civil Engineering Faculty Publications

A 3D DEM model using Particle Flow Code (PFC3D) software was developed utilizing a bonded-ball flexible membrane approach to study cohesionless soil as a discontinuous discrete material. This approach is not yet widely used because of its complexity and high computational cost, but it allowed the authors to observe the stress-strain curves of triaxial specimens, to single out effects of individual factors on the strength and strain properties, and to observe the formation of the shear band and failure surface. The 3D model was calibrated and verified with experimental data, and a sensitivity analysis was carried out for the microparameters. …

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Influence Of Specimen Geometry And Anisotropy On Dynamic Modulus Of Asphalt Mixes In South Carolina, Srinivasan Nagarajan Aug 2022

Influence Of Specimen Geometry And Anisotropy On Dynamic Modulus Of Asphalt Mixes In South Carolina, Srinivasan Nagarajan

All Dissertations

The objective of this study was to characterize the variability of dynamic modulus of asphalt mixes in South Carolina on the basis of geometry and anisotropy. High priority mixes Surface Type B, and C; Intermediate Type B and C and Base Type A from three different days of production were collected from seven different contractors each having a different aggregate source and the dynamic modulus was measured using the Asphalt Mixture Performance Tester (AMPT) at temperatures of 40, 70, 100 and 130℉ (4.4, 21.1, 37.8, and 54.4℃) and at frequencies of 25, 10, 5, 1, 0.5, and 0.1 Hz. One-way …

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Wind Flow Characteristics Of Multi-Vortex Tornadoes And Their Wind Effects On Residential Houses, Yi Zhao Aug 2022

Wind Flow Characteristics Of Multi-Vortex Tornadoes And Their Wind Effects On Residential Houses, Yi Zhao

Doctoral Dissertations

"Tornadoes strike the USA very frequently, with an average of 1200 reports per year, and the average annual tornado-induced property loss has reached $10B. The devastation from recent tornadoes have prompted a renewed interest in better understanding tornado dynamics, their interactions with the built environment, and the performance of civil structures during tornadoes. In the past, the wind effects caused by single-vortex tornadoes have been widely studied, while the multi-vortex tornadoes were rarely considered. In fact, many previous deadly, costly tornadoes involved multiple vortices. Therefore, it is important to understand the wind flow characteristics of multi-vortex tornadoes in order to …

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Feasibility Of Using Ultra-High-Performance Concrete (Uhpc) As A Repair Material Durability Performance, Rebar Coating, And Bond Characterization, Haitham Hussein Aug 2022

Feasibility Of Using Ultra-High-Performance Concrete (Uhpc) As A Repair Material Durability Performance, Rebar Coating, And Bond Characterization, Haitham Hussein

All Dissertations

Ultra-High Performance Concrete can be a very good material for use in repair works. The ability of chloride ions to pass through repaired concrete layers is suppressed if an impermeable concrete like UHPC is used. However, thickness of the UHPC layer and the orientation of the repair layer relative to the direction of chloride ingress may influence its effectiveness. This study is an attempt to evaluate the effect of varying thicknesses and cross sections areas of UHPC over a precast concrete and the direction of the UHPC layers relative to the direction of chloride ion movement on the resistance offered …

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Crack Control And Bond Performance Of Alternative Coated Reinforcements In Concrete, Sachin Sreedhara Aug 2022

Crack Control And Bond Performance Of Alternative Coated Reinforcements In Concrete, Sachin Sreedhara

All Dissertations

Concrete cracking in structures is a ubiquitous problem which can lead to the deterioration of the structure. Other than affecting the strength aspect of a structure, cracking impacts the serviceability criteria as well. Although cracking phenomenon in any structure is highly inevitable, it has to be minimized in order to maintain a structure’s life effectively. Cracking in reinforced concrete structures is related to the bond strength developed between the bar and the concrete. It also depends on an ability of the bar to resist the stresses due to shrinkage to minimize the crack. Another important aspect is the resistance offered …

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Machine Learning-Enabled Model-Based Condition Assessment Of Water Pipelines By Leveraging Hydraulic Monitoring Data, Ahmad Momeni Aug 2022

Machine Learning-Enabled Model-Based Condition Assessment Of Water Pipelines By Leveraging Hydraulic Monitoring Data, Ahmad Momeni

All Dissertations

Overpopulation and climate change have direly challenged the freshwater resources, specifically potable water supplied by water distribution networks (WDNs). One aggravating issue associated with the WDNs is associated with the pipeline leakage, which accounts for almost 20% of freshwater loss in WDNs throughout the US. Leakage detection and severity measurement are of top
asset management priorities in water utilities to minimize and mitigate complicated risks attributed to background and burst leakage. Accordingly, decline in other pipe condition parameters such as effective hydraulic diameters and roughness coefficients, which are complex and uncertain in nature, abets leakage by worsening the WDN status …

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Innovative Foundation Alternative Inspired From Tree Roots, Macie Larranaga Aug 2022

Innovative Foundation Alternative Inspired From Tree Roots, Macie Larranaga

Boise State University Theses and Dissertations

It is not easy to find a more efficient foundation system than the roots of a tree. Trees create a vast three-dimensional network of roots to support and anchor the critical above-ground trunks, leaves, and limbs. In this work, investigations are made for the feasibility of imitating such a technique and creating similar networks to support civil infrastructure, particularly those subjected to moment loads such as traffic signal posts. Some of the raised questions were: Is it feasible to have a shallow tree root-based foundation system to provide the same capacities as conventional foundation alternatives? If this is feasible: What …

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Quantification Of Wave Attentuation Of A Marsh Sill Living Shoreline And Application Of Numerical Modeling For Design Optimization And Adaptation, Maura K. Boswell Aug 2022

Quantification Of Wave Attentuation Of A Marsh Sill Living Shoreline And Application Of Numerical Modeling For Design Optimization And Adaptation, Maura K. Boswell

Civil & Environmental Engineering Theses & Dissertations

Living shorelines integrate structural and natural features to stabilize the shoreline, through reduction of erosion from the wave climate, while keeping the connectivity between land and aquatic ecosystems. With increasing sea levels, living shorelines have the potential to adapt to changing conditions when compared to armored shorelines due to maintaining a level of interconnectivity between land and water. However, to reduce the ecological tradeoffs associated with any type of shoreline erosion protection project that alters the natural state, the design should seek to minimize structural components to those necessary to provide the protection needed for upland habitat to survive erosive …

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Development Of Balanced Mix Design Quality Control Specifications Based On The Acceptance Limits Of Hma Performance Tests, Lucas Tameirao Abrantes Aug 2022

Development Of Balanced Mix Design Quality Control Specifications Based On The Acceptance Limits Of Hma Performance Tests, Lucas Tameirao Abrantes

Open Access Theses & Dissertations

With the augmented use of recycled materials, recycling agents, modified binders, andwarm mix asphalt additives, several highway agencies including the Texas Department of Transportation (TxDOT), have considered methods to improve the durability and long-term performance of asphalt concrete (AC) mixes. The need for performance tests that could consistently evaluate the rutting and cracking potentials of AC mixes became crucial as the popularity of the Balanced Mix Design (BMD) concept has increased over the years. A concern now is related to the practicality of these tests for routine use in the process of quality control and quality assurance during the field …

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A Comparable Analysis Of Civilian And Military Airfield Runway Design Procedures, Jacob Wessel Aug 2022

A Comparable Analysis Of Civilian And Military Airfield Runway Design Procedures, Jacob Wessel

Open Access Theses & Dissertations

In the United States there are two primary agencies that regulate, approve, and aid in airfield runway designs. These two agencies are the Federal Aviation Administration (FAA) and the Department of Defense (DOD), and they both have different design procedure for design and construction of their prospective airfield runways. It is important to have a closer look at the design procedures, the reliance of software and how these compare to each other. The primary objective of this research was to conduct a sensitivity analysis of the FAA and the DOD airfield design programs used to aid in the design of …

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