Open Access. Powered by Scholars. Published by Universities.®

Civil and Environmental Engineering Commons™

Open Access. Powered by Scholars. Published by Universities.®

Discipline
Institution
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 10711 - 10740 of 39809

Full-Text Articles in Civil and Environmental Engineering

Development Of A Framework For The Calibration Of Rpas, A 3d Finite Element Analysis Tool For Rigid Pavements, Abbasali Taghavighalesari Jan 2020

Development Of A Framework For The Calibration Of Rpas, A 3d Finite Element Analysis Tool For Rigid Pavements, Abbasali Taghavighalesari

Open Access Theses & Dissertations

The accurate analysis of rigid pavements requires a reliable modeling procedure based on integrating mechanistic analysis methods (i.e. closed-form solutions or numerical methods) and empirical observations (i.e. field measurements and laboratory test results). The use of the finite element method to model the response of rigid pavements has increased in recent decades due to its capability to incorporate the complexity of material behavior, traffic information, and environmental condition. Researchers from the University of Texas at El Paso developed the software Rigid Pavement Analysis System (RPAS) to comprehensively analyze the response of concrete pavements under different geometric configurations, foundation models, temperature …

Go to article

Impact Of Interface Condition On Performance Of Thin Asphalt Overlays, Cheng Zhu Jan 2020

Impact Of Interface Condition On Performance Of Thin Asphalt Overlays, Cheng Zhu

Open Access Theses & Dissertations

Asphalt overlay has been widely used in the United States as a cost-effective maintenance approach to keep the pavement in a satisfactory condition. In recent years, many studies have been conducted to investigate the overlay asphalt mix design, overlay pavement design, and quality control/quality assurance for the asphalt overlay pavement. In Texas, thin overlays (lift thickness less than 2 in.) and ultra-thin overlays (lift thickness of 0.5 in. to 0.75 in.) seem to be more beneficial than conventional asphalt overlays. For this type of overlay, the bonding condition between the overlay and existing AC layer is crucial for the pavement …

Go to article

A Performance-Based Analysis Of Balanced Mix Designs, Elias Aaron Castillo Jan 2020

A Performance-Based Analysis Of Balanced Mix Designs, Elias Aaron Castillo

Open Access Theses & Dissertations

The Superpave design procedure was established to provide a more representative design methodology and to minimize typical pavement distresses such as fatigue cracking and permanent deformation. This Superpave design methodology was developed on the premise that the voids in mineral aggregate can evaluate the quality and constructability of asphalt mixture during the design and production phases. With the increased use of recycled materials, recycling agents, modified binders and warm mix asphalt additives, several highway agencies including the Texas Department of Transportation (TxDOT), have investigated whether the Superpave volumetric-based design method is enough to ensure appropriate performance of the final product. …

Go to article

A Comparison Of Data-Driven And Process-Based Modeling For Nutrient Estimation In A Eutrophic Reservoir, Yohtaro Kobayashi Jan 2020

A Comparison Of Data-Driven And Process-Based Modeling For Nutrient Estimation In A Eutrophic Reservoir, Yohtaro Kobayashi

Open Access Theses & Dissertations

As land use around bodies of water changes, the need to model the body of water increases. Models help to educate, understand, and predict the state of water. Process-based models are commonly used in modelling bodies of water, but there are challenges with these kinds of models. They require data which can be difficult for certain communities to obtain due to logistics or cost, are computationally intensive, technically complicated, and require calibration. In contrast, a data-driven model simply connect relationships from the data, are not as computationally intensive nor technically complicated, and do not require calibration. This research compared a …

Go to article

Relating Surface Resistivity To Corrosion Of Rebar Embedded In Portland Cement Concrete, Luisa Alejandra Morales Jan 2020

Relating Surface Resistivity To Corrosion Of Rebar Embedded In Portland Cement Concrete, Luisa Alejandra Morales

Open Access Theses & Dissertations

Reinforced concrete is widely used as a construction material known for its durability and proficiency of withstanding large forces in severe environments. Despite that the majority of these structures result in long-term performance, there is still a large number of failures of reinforced concrete structures as a result in corrosion of the reinforcement and concrete degradation. It is critical to assess the state of the corroded structure to decide on whether maintaining or replacing the structure is needed. The objective of this study is to characterize a relationship between the steel reinforcement corrosion and the concrete's resistivity. It is widely …

Go to article

Quantifying Spatiotemporal Patterns Of Past And Future Urban Trends In El Paso, Tx And Their Impact On Electricity Consumption Using Nlcd Data And The Ca-Markov Model, Joanne Michelle Moyer Jan 2020

Quantifying Spatiotemporal Patterns Of Past And Future Urban Trends In El Paso, Tx And Their Impact On Electricity Consumption Using Nlcd Data And The Ca-Markov Model, Joanne Michelle Moyer

Open Access Theses & Dissertations

As cities continue to grow, their urban form continues to evolve over. Understanding this evolution allows for planners, engineers, and decision makers to plan for a sustainable community. Change analysis was conducted for El Paso, Texas county to determine the areas of growth within the past 15-years (2001-2016). The results indicate that growth has primarily occurred within the city of El Paso, in particular Districts 5 (east side), 1 (west side), and 4 (northeast), with District 5 experiencing substantial growth. Developed sub-categories medium and High intensity experienced the fastest growth, which represents single-family housing and compact/commercial areas. However, landscape metrics …

Go to article

Life Cycle Studies To Evaluate The Physiological And Biochemical Effects Of Copper Oxide And Surface-Coated Titanium Dioxide Nanoparticles On Green Onion (Allium Fistulosum) And Carrot (Daucus Carota L.) Plants: Insights Utilizing Two-Photon Microscopy And Spectroscopy, Yi Wang Jan 2020

Life Cycle Studies To Evaluate The Physiological And Biochemical Effects Of Copper Oxide And Surface-Coated Titanium Dioxide Nanoparticles On Green Onion (Allium Fistulosum) And Carrot (Daucus Carota L.) Plants: Insights Utilizing Two-Photon Microscopy And Spectroscopy, Yi Wang

Open Access Theses & Dissertations

With the recent increase of nanomaterial production, nano copper oxide (nCuO) and surface-modified titanium dioxide nanoparticles (nTiO2) are among the most widely applied nanoparticles in industry and daily lives. Their use has resulted in accumulation in soils as a consequence of their direct or indirect release. Hence, these NPs may raise a potential risk to crops cultivated in soils. Moreover, the physiological effects of nCuO on green onion (Allium fistulosum) and surface-coated nTiO2 on full-grown carrot (Daucus carota L.) are still unknown. Green onion is characterized by its high content of the antioxidant allicin, and carrot is a worldwide economic …

Go to article

Performance Measure Methodology Of Project Management Practices In Local Government Agencies, Johanes Johanes Makahaube Jan 2020

Performance Measure Methodology Of Project Management Practices In Local Government Agencies, Johanes Johanes Makahaube

Open Access Theses & Dissertations

Local government agencies have adopted project management practices to deliver public work projects. The agencies need to measure project management performance to ensure the consistency, control, and monitoring of the project delivery process. However, local government agencies have not adopted a systematic method to measure the organization's project-management performance. At present, there is a gap regarding methods to measure project management performance in delivering construction projects. This study aims to assist local government agencies in improving their project management processes by implementing a comprehensive methodology to assess project management's performance. This dissertation is organized into three major chapter-papers: the first …

Go to article

Performane Characterization Of Stabilized Materials In Pavement Foundations, Mohammad Rashidi Jan 2020

Performane Characterization Of Stabilized Materials In Pavement Foundations, Mohammad Rashidi

Open Access Theses & Dissertations

Cementitious Stabilization has been widely used to improve the strength and durability of granular materials for the construction and rehabilitation of pavement structures. Improved mechanical properties and durability of the stabilized materials combined with relatively low cost makes it an attractive method for design engineers. Although this technique appears simple and straight forward, engineering properties of individual soils and aggregates may alter widely due to heterogeneity in soil composition, difference in micro structure among soils, heterogeneity of geologic deposits and differences in chemical interactions of water with soil particles. These differences necessitate the comprehensive study in order to provide the …

Go to article

A New Type Of Crumb Rubber Asphalt Mixture: A Dry Process Design And Performance Evaluation, Feng Ma, Jiasheng Dai, Zhen Fu, Jenny Liu, Wenhao Dong, Zhen Huang Jan 2020

A New Type Of Crumb Rubber Asphalt Mixture: A Dry Process Design And Performance Evaluation, Feng Ma, Jiasheng Dai, Zhen Fu, Jenny Liu, Wenhao Dong, Zhen Huang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

To obtain a crumb rubber asphalt mixture with excellent performance, this study combined trans-polyoctenamer rubber (TOR), crumb rubber, and other additives to establish a new type of crumb rubber (CRT). The objective of this study was to design and evaluate the road performance of the new type of crumb rubber asphalt mixture (CRTAM) with a skeleton dense texture through a dry process. First, the skeleton intrusion compact volume method was used to optimize the grading of coarse and fine aggregates, and the design of the CRTAM gradation was carried out through the same and unequal volume replacement grading method. Then, …

Go to article

The Effects Of Covid-19 On Productivity In Project Management: A Case Study, Emily Lynne Gonzalez Jan 2020

The Effects Of Covid-19 On Productivity In Project Management: A Case Study, Emily Lynne Gonzalez

Construction Management

The COVID-19 pandemic has affected many aspects of the construction industry and one of the main aspects that has been affected is productivity. Monitoring productivity on a job is important because it allows us to identify areas that take up the most time and thus gives us the opportunity to allocate resources effectively. Due to safety regulations and new protocols being put in place, the productivity levels on every job has changed. Whether its out in the field or in the office, workplace productivity has certainly been affected by COVID-19. This case study focuses on how the pandemic has affected …

Go to article

Seismic Performance Of Mechanically Spliced Bridge Columns Through Analytical Studies, Mathew Ray Lavoy Jan 2020

Seismic Performance Of Mechanically Spliced Bridge Columns Through Analytical Studies, Mathew Ray Lavoy

Electronic Theses and Dissertations

Reinforcement continuity in concrete members is traditionally achieved through lap splicing. Mechanical bar splices are an alternative to traditional lap splices. Mechanical bar splices utilize mechanical devices known as bar coupler to connect the ends of reinforcing bars. Bar couplers are common in accelerated bridge construction applications at non-critical members but are not allowed in the plastic hinge region of bridge columns probably due to a lack of knowledge on how they affect seismic performance of columns. A comprehensive analytical study was carried out to determine how bar couplers used at the base of bridge columns affect: 1) column lateral …

Go to article

Prevention Of Harmful Algal Blooms By The Mitigation Of Phosphorus Nutrient Loading Via Filtration By Steel Wool And Activated Carbon, Samantha Zidd, Sara Kidd, Ronald Simpson Jan 2020

Prevention Of Harmful Algal Blooms By The Mitigation Of Phosphorus Nutrient Loading Via Filtration By Steel Wool And Activated Carbon, Samantha Zidd, Sara Kidd, Ronald Simpson

Williams Honors College, Honors Research Projects

Harmful Algal Blooms (HABs) are a devastating ecological and economic consequence of the abundance of nutrient-rich agricultural runoff entering aquatic ecosystems (Baker et al. 2014). Bioavailable phosphorus from synthetic fertilizers is one of the major nutrients contributing to this global issue. Preliminary studies indicate that dissolved phosphorus can be removed from an aqueous environment when passed through a composite mixture of granular steel wool particles and activated carbon (Erickson, Gulliver, and Weiss (2007). Further research was conducted using higher quality concentration measurements to determine what grades of steel wool (0000, 000, 00) and types of activated carbon (GAC, PAC, EAC) …

Go to article

Implementation Of Real-Time Decision Support Technology At Akron Water Reclamation Facility, Hunter Durbin Jan 2020

Implementation Of Real-Time Decision Support Technology At Akron Water Reclamation Facility, Hunter Durbin

Williams Honors College, Honors Research Projects

Advances in computer science, data analytics, hardware, and software are changing the way that sewer collection systems are able to operate. By combining these technologies into something called a Real-Time Decision Support System (RTDSS), operators of sewer collection systems can make operational decisions supported by data being recorded throughout the sewer system in real-time. A RTDSS has the potential to optimize the available capacity of a sewer collection system at a lower cost compared to traditional construction solutions. The City of Akron is in the process of implementing a RTDSS in their sewer collection system. This report analyzes how the …

Go to article

The Future Of Roundabouts In Northeast Ohio, Bret Baker Jan 2020

The Future Of Roundabouts In Northeast Ohio, Bret Baker

Williams Honors College, Honors Research Projects

For my honors project, I plan on doing a formal analysis of the type of intersection known as roundabouts. I want to approach the general topic of roundabouts and then focus on local roundabouts in Northeast Ohio. My analysis would include roundabouts currently in use, in the process of being constructed, as well as roundabout projects currently in design and future projects. I want to answer the questions, "What does the future of roundabouts look like in Northeast Ohio? Will there be more? Are they better than the traditional signalized or traffic sign intersections?" I will be using this information …

Go to article

Water Condensation Collection For Disaster Relief, Tyler Gaydosh Jan 2020

Water Condensation Collection For Disaster Relief, Tyler Gaydosh

Williams Honors College, Honors Research Projects

Numerous populations experience sudden, unexpected circumstances where drinking water supply may be compromised. Current leading response strategies include the delivery of disposable water bottles, a simple and effective way of meeting the demand of fresh drinking water. The lack of reusability results in problems with waste and cost. Any response to provide drinking water to a population in these circumstances must consider a prolonged crisis and these limitations: minimal delivery opportunities, power supply, and waste management (e.g., aftereffects of Hurricane Maria in Puerto Rico). A review of alternatives for water collection was done to determine a viable collection method that …

Go to article

Comparision Of Fillet-Welded Base Plate Fatigue Design For Highway Support Structures With Laboratory Research Tests, William Shea Jan 2020

Comparision Of Fillet-Welded Base Plate Fatigue Design For Highway Support Structures With Laboratory Research Tests, William Shea

Williams Honors College, Honors Research Projects

There are many types of vertical structures along highways that serve unique purposes. These structures include traffic signs for directing, warning, or regulating traffic, luminaires for distributing and directing light, traffic signals supporting equipment such as traffic lights, and combination structures including any combination of the aforementioned structures. Highway support structures are typically fabricated from steel or aluminum and are designed to the guidelines and specifications of the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals. The structures are connected to a foundation by anchor bolts through a welded base plate. Often a cause …

Go to article

Applications Of Ultra-High Performance Concrete, Zachary Plevny Jan 2020

Applications Of Ultra-High Performance Concrete, Zachary Plevny

Williams Honors College, Honors Research Projects

The main objective of this research paper is to determine the current applications of ultra-high performance concrete (UHPC). A second objective is to determine the reason UHPC is used in various applications. More than 17 bridges in the United States have been built with UHPC components. A handful of state departments of transportation have deployed UHPC components within their infrastructure, and many more are actively doing research and considering the use of UHPC. So, this is a relatively new material that is becoming more widely used. The following seven projects, which include UHPC components are discussed in detail: Mars Hill …

Go to article

Internet Of Things For Sustainable Mining, Abdul Salam Jan 2020

Internet Of Things For Sustainable Mining, Abdul Salam

Faculty Publications

The sustainable mining Internet of Things deals with the applications of IoT technology to the coupled needs of sustainable recovery of metals and a healthy environment for a thriving planet. In this chapter, the IoT architecture and technology is presented to support development of a digital mining platform emphasizing the exploration of rock–fluid–environment interactions to develop extraction methods with maximum economic benefit, while maintaining and preserving both water quantity and quality, soil, and, ultimately, human health. New perspectives are provided for IoT applications in developing new mineral resources, improved management of tailings, monitoring and mitigating contamination from mining. Moreover, tools …

Go to article

The Covid-19 Pandemic And Transportation Engineering, Chris Hendrickson,, Laurence Rilett Jan 2020

The Covid-19 Pandemic And Transportation Engineering, Chris Hendrickson,, Laurence Rilett

Department of Civil and Environmental Engineering: Faculty Publications

The COVID-19 pandemic has been an enormous global disruption with immense economic, environmental, and social impacts throughout the world. Only world wars and the flu pandemic of 1918 are comparable in the wide range of consequences, including fatalities, over a relatively short period of time. Unfortunately, we can expect other major disruptions to occur in the future. In this editorial, we intend to discern some lessons for the transportation engineering profession that can be learned from the current catastrophe that can help us prepare for future disruptions. We will ignore nontransportation aspects of the pandemic such as the development of …

Go to article

Experimental Study On The Characteristics Of Formation And Dissociation Of Co2 Hydrates In Porous Media, Amin Hosseini Zadeh, Ijung Kim, Seunghee Kim Jan 2020

Experimental Study On The Characteristics Of Formation And Dissociation Of Co2 Hydrates In Porous Media, Amin Hosseini Zadeh, Ijung Kim, Seunghee Kim

Department of Civil and Environmental Engineering: Faculty Publications

Geologic carbon sequestration (GCS) has pursued as a feasible strategy to store the large amount of CO2 to curb its emission to the atmosphere in an effort to mitigate the greenhouse effects. CO2 hydrate, which can form when the pressure and temperature satisfy its stability condition, can provide a self-trapping mechanism for an offshore CO2 geologic storage. For example, direct sequestration of CO2 in the form of hydrate cystals an be achieved in the storage zone an potentially provide a secondary caprock. These application, however, require a thorough understanding of the formation and dissociation of CO …

Go to article

Evaluation And Modeling Of Electrodialysis For High-Recovery Brackish Water Desalination, Shahrouz Jafarzade Ghadimi Jan 2020

Evaluation And Modeling Of Electrodialysis For High-Recovery Brackish Water Desalination, Shahrouz Jafarzade Ghadimi

Open Access Theses & Dissertations

This research investigates the feasibility of desalination of brackish water with electrodialysis (ED), using laboratory testing and mathematical modeling. Several experiments were performed to characterize ion-specific transport and to evaluate tradeoffs between salinity removal and specific energy consumption. A 200 cm2 Ameridia ED stack was used to perform desalination experiments with real brackish groundwater from the Kay Bailey Hutchison desalination plant in El Paso, Texas, and the results showed limiting current density of 160 A/m2 for 5 cm/s. A higher conductivity reduction was observed for flow velocity of 5 cm/s compared to 13 cm/s. Ion transport selectivity (based on relative …

Go to article

Impact Of Increased Precipitation On Midwestern Construction, Monica Feltman Jan 2020

Impact Of Increased Precipitation On Midwestern Construction, Monica Feltman

Williams Honors College, Honors Research Projects

This paper presents the current impact of increased precipitation in the Midwest on the construction industry. Mainly, the impact on jobsite safety, increasing insurance rates, and the resulting changes in design codes, or lack thereof. The goal of this independent research is to gather a better understanding of the influence of these changes, because only then can one accurately seek to combat their harmful effects. As a vital element of the global economy, the construction industry must be conscious of their changing relationship with the environment around them. Therefore, understanding the affects of harmful climate change, will increase awareness of …

Go to article

A Survey Of Education In Civil Engineering, Tyler Fuller Jan 2020

A Survey Of Education In Civil Engineering, Tyler Fuller

Williams Honors College, Honors Research Projects

This paper provides an overview of the current education requirements in the field of civil engineering. This is achieved through means of an anonymous survey sent to civil engineering academics and data gathered from the published curricula of ten existing civil engineering programs. These ten programs were selected by means of a random number generator from the list of institutions the survey was sent to. Such an overview is important for gauging the effectiveness of civil engineering education for current and future students.

Go to article

Steel Bridge Truss Analysis, Alastair Seed Jan 2020

Steel Bridge Truss Analysis, Alastair Seed

Williams Honors College, Honors Research Projects

The purpose of this project is to conduct a study comparing the effectiveness of different cross frame orientations in lowering the deflection of the main stringers of a bridge. Three different orientations of cross frames were researched; vertical, angled with the superstructure webbing, and halfway-angled. All of these were studied when the stringers were placed directly under the superstructure and when the superstructure was placed outside of the stringers. Analysis was performed in a program called SAP 2000 to find the deflections along the stringers under different loading conditions. The results showed that when the superstructure was oriented over the …

Go to article

Bs News January/February Jan 2020

Bs News January/February

Building Services Engineering

No abstract provided.

Go to article

Right-Hook Crash Scenario: Effects Of Environmental Factors On Driver's Visual Attention And Crash Risk, Mafruhatul Jannat, Hagai Tapiro, Christopher Monsere, David Hurwitz Jan 2020

Right-Hook Crash Scenario: Effects Of Environmental Factors On Driver's Visual Attention And Crash Risk, Mafruhatul Jannat, Hagai Tapiro, Christopher Monsere, David Hurwitz

Civil and Environmental Engineering Faculty Publications and Presentations

A right-hook (RH) crash is a common type of bicycle–motor vehicle crash that occurs between a right-turning vehicle and through-moving bicycle at an intersection in right-hand driving countries. Despite the frequency and severity of this crash type, no significant driver-performance based evidence of the causes of RH crashes at signalized intersections was found in the literature. This study examined the driver’s visual attention in a right-turning scenario at signalized intersections with bicycle lanes but no exclusive right-turning lanes while interacting with a bicyclist to develop an understanding of RH crash causality. Fifty-one participants in 21 simulated road scenarios performed a …

Go to article

Can The Integration Of Bim And Gis Enhance Information Management For Large Scale Linear Infrastructure Projects?, Bim Tudublin, Brendan Kennedy Jan 2020

Can The Integration Of Bim And Gis Enhance Information Management For Large Scale Linear Infrastructure Projects?, Bim Tudublin, Brendan Kennedy

Capstone Reports

The integration of BIM and GIS is the subject of considerable research, particularly as the two coalesce for the purpose of information management. Large scale infrastructure projects require best practice in terms of how information is managed given the volume of information generated throughout the project lifecycle and the numerous parties requiring access to project content. This paper investigates whether the integration of BIM and GIS can enhance information management on large scale linear infrastructure projects. The research comprised a literature review and interviews with a number of BIM/GIS professionals actively working on linear infrastructure projects across the world. Some …

Go to article

Evaluation Of An Interview-Based Internship Class In The Construction Management Curriculum: A Case Study Of The University Of Nebraska-Lincoln, Ali Karji, Stuart Bernstein, Mohammadsoroush Tafazzoli, Arash Arash Taghinezhad, Arefeh Mohammadi Jan 2020

Evaluation Of An Interview-Based Internship Class In The Construction Management Curriculum: A Case Study Of The University Of Nebraska-Lincoln, Ali Karji, Stuart Bernstein, Mohammadsoroush Tafazzoli, Arash Arash Taghinezhad, Arefeh Mohammadi

Department of Construction Engineering and Management: Faculty Publications

Internships have been shown to be impactful tools to connect students’ learning in academia with real-world industrial needs. To help the students to get more out of their internship experience, some universities provide a summer internship class in which students do class assignments based on their experiences during their internship. There have been numerous studies on the benefits of internships. However, the benefits of a potential internship class for students in construction management (CM) programs at universities have not yet been investigated. This paper demonstrates the structure of an interview-based internship class and investigates its effectiveness. We have focused on …

Go to article

Field Assessment Of Interreplicate Variability From Eight Electromagnetic Soil Moisture Sensors, Tsz Him Lo, Daran Rudnick, Jasreman Singh, Hope Njuki Nakabuye, Abia Katimbo, Derek M. Heeren, Yufeng Ge Jan 2020

Field Assessment Of Interreplicate Variability From Eight Electromagnetic Soil Moisture Sensors, Tsz Him Lo, Daran Rudnick, Jasreman Singh, Hope Njuki Nakabuye, Abia Katimbo, Derek M. Heeren, Yufeng Ge

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Interreplicate variability—the spread in output values among units of the same sensor subjected to essentially the same condition—can be a major source of uncertainty in sensor data. To investigate the interreplicate variability among eight electromagnetic soil moisture sensors through a field study, eight units of TDR315, CS616, CS655, HydraProbe2, EC5, 5TE, and Teros12 were installed at a depth of 0.30 m within 3 m of each other, whereas three units of AquaSpy Vector Probe were installed within 3 m of each other. The magnitude of interreplicate variability in volumetric water content (θv) was generally similar between a static …

Go to article

First Prev Next Last