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2020

Civil and Environmental Engineering

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Articles 1 - 30 of 657

Full-Text Articles in Engineering

A Review Of Different Aspects Of Applying Asphalt And Bituminous Mixes Under A Railway Track, Kazem Jadidi, Morteza Esmaeili, Mehdi Kalantari, Moses Karakouzian Dec 2020

A Review Of Different Aspects Of Applying Asphalt And Bituminous Mixes Under A Railway Track, Kazem Jadidi, Morteza Esmaeili, Mehdi Kalantari, Moses Karakouzian

Civil and Environmental Engineering and Construction Faculty Research

Asphalt is a common material that is used extensively for roadways. Furthermore, bituminous mixes have been used in railways, both as asphalt and as mortar. Different agencies and research institutes have investigated and suggested various applications. These studies indicate the benefits of bituminous material under railways, such as improving a substructure’s stiffness and bearing capacity; enhancing its dynamic characteristics and response, especially under high-speed train loads; waterproofing the subgrade; protecting the top layers against fine contamination. These potential applications can improve the overall track structure performance and lead to minimizing settlement under heavy loads. They can also guarantee an appropriate …

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A Review Of Different Aspects Of Applying Asphalt And Bituminous Mixes Under A Railway Track, Kazem Jadidi, Morteza Esmaeili, Mehdi Kalantari, Mehdi Khalili Dec 2020

A Review Of Different Aspects Of Applying Asphalt And Bituminous Mixes Under A Railway Track, Kazem Jadidi, Morteza Esmaeili, Mehdi Kalantari, Mehdi Khalili

Civil and Environmental Engineering and Construction Faculty Research

Asphalt is a common material that is used extensively for roadways. Furthermore, bituminous mixes have been used in railways, both as asphalt and as mortar. Different agencies and research institutes have investigated and suggested various applications. These studies indicate the benefits of bituminous material under railways, such as improving a substructure’s stiffness and bearing capacity; enhancing its dynamic characteristics and response, especially under high-speed train loads; waterproofing the subgrade; protecting the top layers against fine contamination. These potential applications can improve the overall track structure performance and lead to minimizing settlement under heavy loads. They can also guarantee an appropriate …

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River & Estuary Observation Network: Refinement Of Stage Height Sensor Subsystem For Low Cost And High Reliability, W. D. Kirkey, C. B. Fuller, P. O'Brien, P. J. Kirkey, Ahmed Mahmoud, Andrew Ernest, Javier Guerrero Dec 2020

River & Estuary Observation Network: Refinement Of Stage Height Sensor Subsystem For Low Cost And High Reliability, W. D. Kirkey, C. B. Fuller, P. O'Brien, P. J. Kirkey, Ahmed Mahmoud, Andrew Ernest, Javier Guerrero

Civil Engineering Faculty Publications and Presentations

A system comprised of software and on-site measurements is presented for accurately obtaining water stage data from vented or non-vented submersible pressure sensors installed at autonomous stream gauging stations. The system accounts for pressure sensor offset errors, water density, and local gravitational acceleration to produce a stage height reading which is accurate to either ±0.01 ft (±3 mm) or to the accuracy limit of the sensor, whichever is greater. A 2nd order polynomial expression for determination of water density from temperature and salinity is developed and found to be sufficiently accurate for this purpose. Simulated stage measurements performed in the …

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Effect Of Temperature On Early‐Age Properties Of Self‐Consolidating Concrete Equivalent Mortar, Nima Farzadnia, Jing Pan, Kamal Khayat, Eric Wirquin Dec 2020

Effect Of Temperature On Early‐Age Properties Of Self‐Consolidating Concrete Equivalent Mortar, Nima Farzadnia, Jing Pan, Kamal Khayat, Eric Wirquin

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this study, the effect of ambient temperature during casting on fresh properties, hydration kinetics, and early‐age compressive strength of self-consolidating concrete (SCC) was evaluated. Concrete equivalent mortars (CEMs) with water‐to‐binder ratios of 0.41 and 0.45 were cast based on SCC mixture designs for building and infrastructure construction and precast applications. The CEMs were prepared at temperatures ranging from 8 to 36°C. Superplasticizer (SP) and air‐entraining agent (AEA) demand were evaluated for the CEM mixtures made with different supplementary cementing material (SCM) and limestone filler types. Test results showed that the ambient temperature can significantly affect the SP and AEA …

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An Assessment Of Research Trends On Fiscal Policy, Shabir Hussain Khahro, Shoail Farooq, Tauha Hussain Ali Dr, Nafees Ahmed Memon Dr, Qasim Hussain Khahro Dec 2020

An Assessment Of Research Trends On Fiscal Policy, Shabir Hussain Khahro, Shoail Farooq, Tauha Hussain Ali Dr, Nafees Ahmed Memon Dr, Qasim Hussain Khahro

Library Philosophy and Practice (e-journal)

Fiscal policy has been a topic of research interest for researchers. It plays a very important role in the economic growth of any country. Fiscal policy does not only achieve economic development, but eliminates the hindrances that assist economic stability. Based on the significance of the term. This paper evaluates the research output of the term fiscal policy since 1970 in different fields using the Scopus database. The data was collected from the Scopus database and were analyzed using Microsoft Excel to analyze the research trends on fiscal policy. It is concluded that fiscal policy has been a topic of …

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Effective Early Treatment Of Microcystis Exponential Growth And Microcystin Production With Hydrogen Peroxide And Hydroxyapatite, Ian Struewing, Nathan Sienkiewicz, Chiqian Zhang, Nicholas Dugan, Jingrang Lu Dec 2020

Effective Early Treatment Of Microcystis Exponential Growth And Microcystin Production With Hydrogen Peroxide And Hydroxyapatite, Ian Struewing, Nathan Sienkiewicz, Chiqian Zhang, Nicholas Dugan, Jingrang Lu

Faculty Publications

: Mitigating cyanotoxin production is essential to protecting aquatic ecosystems and public health. However, current harmful cyanobacterial bloom (HCB) control strategies have significant shortcomings. Because predicting HCBs is difficult, current HCB control strategies are employed when heavy HCBs have already occurred. Our pilot study developed an effective HCB prediction approach that is employed before exponential cyanobacterial growth and massive cyanotoxin pro‐ duction can occur. We used a quantitative polymerase chain reaction (qPCR) assay targeting the toxin‐encoding gene mcyA to signal the timing of treatment. When control measures were applied at an early growth stage or one week before the exponential …

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Bibliometric Survey On Effect Of Climate Factors On Spread Of Coronavirus (Covid-19), Seema Patil, Jay Makwana, Manish Attri Dec 2020

Bibliometric Survey On Effect Of Climate Factors On Spread Of Coronavirus (Covid-19), Seema Patil, Jay Makwana, Manish Attri

Library Philosophy and Practice (e-journal)

The new SARS-CoV-2 COVID-19 has spread quickly around the globe since it was first reported in Wuhan city of China, in December 2019 subsequent to being contracted from a zoonotic source. The main focus of this bibliometric survey is to recognize the few studies which have upheld the epidemiological hypothesis that the effect of climatic factors is playing a crucial role in the spreading of COVID-19. The analysis is done on the basis of 412 documents such as journals, articles, editorials, short surveys and some review papers. The United States contributes to the maximum number of publications followed by the …

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Bibliometric Survey On Effects Of Climate Change On Incidences Of Infectious Diseases, Seema Harshad Patil, Yatharth Jain, Vedant Marathe Dec 2020

Bibliometric Survey On Effects Of Climate Change On Incidences Of Infectious Diseases, Seema Harshad Patil, Yatharth Jain, Vedant Marathe

Library Philosophy and Practice (e-journal)

For understanding the influx of Infectious Diseases, research of climate change and its effects pertaining to the diseases is important. The motive of this bibliometric survey is to understand the research which has been carried out regarding the aforementioned topics. This paper summarizes the research in the 21st Century from 2001 to present. We conducted this analysis using tools such as Gephi, Researchgate, Scopus, ScienceScape, Google Scholar and Mapchart. This Bibliometric Survey on “Effects of Climate Change on Infectious Diseases” showed that maximum publications are articles. These publications are from conferences and journals related to Environmental Science. The United States …

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State Of The Art In Composition, Fabrication, Characterization, And Modeling Methods Of Cement-Based Thermoelectric Materials For Low-Temperature Applications, Xiaoli Liu, Ruchita Jani, Esther Orisakwee, Conrad Johnston, Piotr Chudzinski, Ming Qu, Brian Norton, Niall Holmes Dr., Jorge Kohanoff, Lorenzo Stella, Hongxi Yin, Kazuaki Yazawa Dec 2020

State Of The Art In Composition, Fabrication, Characterization, And Modeling Methods Of Cement-Based Thermoelectric Materials For Low-Temperature Applications, Xiaoli Liu, Ruchita Jani, Esther Orisakwee, Conrad Johnston, Piotr Chudzinski, Ming Qu, Brian Norton, Niall Holmes Dr., Jorge Kohanoff, Lorenzo Stella, Hongxi Yin, Kazuaki Yazawa

Articles

The worldwide energy crisis and environmental deterioration are probably humanity’s greatest challenges. Thermoelectricity, which allows for the mutual conversion between thermal and electrical energy, has become a promising technology to alleviate this challenge. Increasingly more research focuses on how to fabricate and apply thermoelectric materials for harvesting energy and regulating the indoor thermal environment. However, only a few studies have focused on cementitious materials with thermoelectric potential. Thermoelectric cement is a composite material in which particular additives can enhance the thermoelectric performance of ordinary cement. By potentially replacing traditional construction materials with thermoelectric cement in building applications, electricity could be …

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Brazil, Big Hydro, And A Beautiful Monster: “Green” Energy Generation In The Xingu River Basin, Ian F. Hirons Dec 2020

Brazil, Big Hydro, And A Beautiful Monster: “Green” Energy Generation In The Xingu River Basin, Ian F. Hirons

Student Works

Brazil is quickly becoming an influential actor on the world stage of geopolitics. The nation has achieved global economic and environmental recognition due to the extensive development of its hydrological resources in the form of hydroelectric power plants. As the world’s second greatest generator of hydroelectricity, Brazil has proven a staunch adherence to building dams in the large-scale. Though these dams have brought electricity to millions of people across the country, the socio-ecological toll inflicted by their construction has been devastating to natural biomes and local inhabitants. This article traces Brazil’s proclivity for large-scale hydropower to four motivational categories often …

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Loup Public Power District Fishing Pier & Parking Lot, Tyler Ruwe Dec 2020

Loup Public Power District Fishing Pier & Parking Lot, Tyler Ruwe

Honors Theses

This project was performed in fulfillment of the Civil Engineering Senior Design class (CIVE 489H). The goal of this project was to design an ADA compliant fishing pier and parking lot for the Loup Public Power District in Columbus, Nebraska. The fishing pier and parking lot will be located near the northeast corner of Lake North. A four-member team was formed to delegate the workload to accomplish this design project. I, Tyler Ruwe, served as the team’s project manager and structural engineering lead. Other disciplines of this design project included work involved in geotechnical, water resources, environmental, and transportation engineering. …

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Ccfss Technical Bulletin Fall 2020, Vol. 21, Number 3, Wei-Wen Yu Center For Cold-Formed Steel Structures Dec 2020

Ccfss Technical Bulletin Fall 2020, Vol. 21, Number 3, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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Benefits Of Pre-Construction Analysis: Cet Senior Capstone Expands Understanding Of An Urban Refuge At Gallopnyc Sunrise Stables, Aalaa Mohammed Dec 2020

Benefits Of Pre-Construction Analysis: Cet Senior Capstone Expands Understanding Of An Urban Refuge At Gallopnyc Sunrise Stables, Aalaa Mohammed

Publications and Research

For any construction project, there exists a phase of planning known as “pre-construction.” This initial phase of the project provides a definition of the project, identification of potential issues, planning and scheduling, scope, cost estimation, and analysis of needs for the job. My research analyzes a pre-construction case study conducted for Gallop NYC’s Stable in Howard Beach, Queens. The findings suggest that the practice of construction planning is effective in order to avoid delays in construction itself and ensure successful project completion. Supporting literature examines some of the best practices for pre-construction analysis. These include but are not limited to: …

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Bio-Binder—Innovative Asphalt Technology, Amir Tabakovic Dec 2020

Bio-Binder—Innovative Asphalt Technology, Amir Tabakovic

Articles

The global road network spans 16.3 million km [1], of which 5 million km is in the EU. These road networks fulfil major economic and social goals by facilitating the movement of goods and people throughout the EU, and are therefore of the utmost importance to the economic and social life of the EU [2]. National governments invest heavily in their road networks, e.g., in 2014, EUR 53.33 billion was invested in the development and maintenance of the EU road network [3]. Each year, the world produces 1.6 trillion tonnes of asphalt [4], of which 218 million tonnes is produced …

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Hydraulic And Mineralogical Characterization Of Organoclay Before And After Reaction With Non-Aqueous Phase Liquid (Napl), Mostafa Afzalian Dec 2020

Hydraulic And Mineralogical Characterization Of Organoclay Before And After Reaction With Non-Aqueous Phase Liquid (Napl), Mostafa Afzalian

Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research

Sediment capping—a method used to stabilize and remediate contaminated subaqueous sediment in lakes or river shores by covering the contaminant with multiple layered materials— is a more effective, economic, and durable in situ treatment compared to ex situ methods such as dredging. The caps are typically composed of porous geomaterials such as gravels, sands, Reactive Core Mat (RCM), including reactive soils (e.g., organoclay) and geosynthetics (e.g., geotextiles). The designed caps are regarded as water-permeable so as not to disturb the sediment; however, the caps become unsaturated state because of trapped gas generated from the decomposition of organic matter. Most of …

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Quality Control In Concrete Pavement: Early Detection Of Near-Surface Honeycombing With Gpr, Theresa Mccabe Dec 2020

Quality Control In Concrete Pavement: Early Detection Of Near-Surface Honeycombing With Gpr, Theresa Mccabe

Durham School of Architectural Engineering and Construction: Dissertations, Thesis, and Student Research

This thesis presents utilization of Ground Penetrating Radar (GPR) for the assessment of highway pavements to gain a better understanding of this NDE method’s capabilities in terms of early detection of consolidation-caused air voids in brittle materials. The objectives are to first, determine the earliest time during the dormant, setting, and early hardening periods of concrete’s set that GPR can be used to detect shallow air voids. Secondly, the change in dielectric constant will be tracked over the first 24 hours of concrete setting in order to quantify the impact of the dielectric constant assumptions in early detection. Two different …

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Ccfss Technical Bulletin Fall 2020, Vol. 21, Number 2, Wei-Wen Yu Center For Cold-Formed Steel Structures Dec 2020

Ccfss Technical Bulletin Fall 2020, Vol. 21, Number 2, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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Ccfss Technical Bulletin Fall 2020, Vol. 21, Number 1, Wei-Wen Yu Center For Cold-Formed Steel Structures Dec 2020

Ccfss Technical Bulletin Fall 2020, Vol. 21, Number 1, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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Carbon Sequestration By Reforesting Legacy Grasslands On Coal Mining Sites, James F. Fox, J. Elliott Campbell, Peter M. Acton Dec 2020

Carbon Sequestration By Reforesting Legacy Grasslands On Coal Mining Sites, James F. Fox, J. Elliott Campbell, Peter M. Acton

Civil Engineering Faculty Publications

Future carbon management during energy production will rely on carbon capture and sequestration technology and carbon sequestration methods for offsetting non-capturable losses. The present study quantifies carbon sequestration via reforestation using measurements and modeling for recent and legacy surface coal mining grasslands that are re-restored through tree planting. This paper focuses on a case study of legacy coal mining sites in the southern Appalachia the United States. This five million-hectare region has a surface mining footprint of approximately 12% of the land area, and the reclamation method was primarily grassland. The results of the soil carbon sequestration rates for restored …

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Improving Tolerance Control On Modular Construction Project With 3d Laser Scanning And Bim: A Case Study Of Removable Floodwall Project, Huimin Li, Chengyi Zhang, Siyuan Song, Sevilay Demirkesen, Ruidong Chang Dec 2020

Improving Tolerance Control On Modular Construction Project With 3d Laser Scanning And Bim: A Case Study Of Removable Floodwall Project, Huimin Li, Chengyi Zhang, Siyuan Song, Sevilay Demirkesen, Ruidong Chang

Faculty Publications

Quality control is essential to a successful modular construction project and should be enhanced throughout the project from design to construction and installation. The current methods for analyzing the assembly quality of a removable floodwall heavily rely on manual inspection and contact-type measurements, which are time-consuming and costly. This study presents a systematic and practical approach to improve quality control of the prefabricated modular construction projects by integrating building information modeling (BIM) with three-dimensional (3D) laser scanning technology. The study starts with a thorough literature review of current quality control methods in modular construction. Firstly, the critical quality control procedure …

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Development Of A Self-Powered Weigh-In-Motion System, Athanassios Papagiannakis, Athanassios Papagiannakis, Samer Dessouky, Sara Ahmed, Reza Khalili, Gopal Vishwakarma Dec 2020

Development Of A Self-Powered Weigh-In-Motion System, Athanassios Papagiannakis, Athanassios Papagiannakis, Samer Dessouky, Sara Ahmed, Reza Khalili, Gopal Vishwakarma

Data

This report describes the development of a novel weigh-in-motion (WIM) system that utilizes piezoelectric elements for sensing load and powering an ultra-low power microcontroller unit (MCU) that serves as its data acquisition system. A system of 4 piezoelectric (PZT) stacks serves as the energy harvester, while load sensing is done via a set of 4 PZT elements connected in parallel. Two alternative MCUs were considered, with various data handling capabilities and power consumption requirements. These MCUs have very short “wake-up” times allowing vehicle sensing without the need for inductive loops commonly used in conventional WIM systems. Special electric circuits were …

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Development Of A Self-Powered Weigh-In-Motion System, Athanassios Papagiannakis, Sarah Ahmed, Samer Dessouky, Reza Khalili, Gopal Vishwakarma Dec 2020

Development Of A Self-Powered Weigh-In-Motion System, Athanassios Papagiannakis, Sarah Ahmed, Samer Dessouky, Reza Khalili, Gopal Vishwakarma

Publications

This report describes the development of a novel weigh-in-motion (WIM) system that utilizes piezoelectric elements for sensing load and powering an ultra-low power microcontroller unit (MCU) that serves as its data acquisition system. A system of 4 piezoelectric (PZT) stacks serves as the energy harvester, while load sensing is done via a set of 4 PZT elements connected in parallel. Two alternative MCUs were considered, with various data handling capabilities and power consumption requirements. These MCUs have very short “wake-up” times allowing vehicle sensing without the need for inductive loops commonly used in conventional WIM systems. Special electric circuits were …

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A One‐Dimensional Model For Turbulent Mixing In The Benthic Biolayer Of Stream And Coastal Sediments, Stanley B. Grant, Jesus D. Gomez‐Velez, Marco Ghisalberti, Ian Guymer, Fulvio Boano, Kevin Roche, Judson Harvey Dec 2020

A One‐Dimensional Model For Turbulent Mixing In The Benthic Biolayer Of Stream And Coastal Sediments, Stanley B. Grant, Jesus D. Gomez‐Velez, Marco Ghisalberti, Ian Guymer, Fulvio Boano, Kevin Roche, Judson Harvey

Civil Engineering Faculty Publications and Presentations

In this paper, we develop and validate a rigorous modeling framework, based on Duhamel's Theorem, for the unsteady one‐dimensional vertical transport of a solute across a flat sediment‐water interface (SWI) and through the benthic biolayer of a turbulent stream. The modeling framework is novel in capturing the two‐way coupling between evolving solute concentrations above and below the SWI and in allowing for a depth‐varying diffusivity. Three diffusivity profiles within the sediment (constant, exponentially decaying, and a hybrid model) are evaluated against an extensive set of previously published laboratory measurements of turbulent mass transfer across the SWI. The exponential diffusivity profile …

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Wei-Wen Yu Center For Cold-Formed Steel Structures (1990-2020), Roger A. Laboube, Wei-Wen Yu Dec 2020

Wei-Wen Yu Center For Cold-Formed Steel Structures (1990-2020), Roger A. Laboube, Wei-Wen Yu

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

Final Report: Wei-Wen Yu Center For Cold-Formed Steel Structures

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Innovative Approach To Repair Corroded Steel Piles Using Ultra-High Performance Concrete, Binod Shrestha, Ahmed Gheni, Mohanad M. Abdulazeez, Mohamed Elgawady Dec 2020

Innovative Approach To Repair Corroded Steel Piles Using Ultra-High Performance Concrete, Binod Shrestha, Ahmed Gheni, Mohanad M. Abdulazeez, Mohamed Elgawady

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Steel H-piles are a common structural system in existing bridges. Many steel H-piles have been corroded as a result of severe weather and acid/alkaline salt exposures, causing a reduction in the axial load capacity. This paper experimentally investigates the use of ultra-high performance concrete (UHPC) encasement as a novel repair method for corroded steel H-pile. UHPC displays better tensile strength, early compressive strength, workability, and durability compared with conventional concrete. The proposed repair is used to bridge the corroded section in H-pile using either a cast-in-place or precast UHPC elements. A series of push-out tests was conducted on eight full-scale …

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Improved Virus Isoelectric Point Estimation By Exclusion Of Known And Predicted Genome-Binding Regions, Joe Heffron, Brooke Mayer Dec 2020

Improved Virus Isoelectric Point Estimation By Exclusion Of Known And Predicted Genome-Binding Regions, Joe Heffron, Brooke Mayer

Civil and Environmental Engineering Faculty Research and Publications

Knowledge of the isoelectric points (pIs) of viruses is beneficial for predicting virus behavior in environmental transport and physical/chemical treatment applications. However, the empirically measured pIs of many viruses have thus far defied simple explanation, let alone prediction, based on the ionizable amino acid composition of the virus capsid. Here, we suggest an approach for predicting the pI of nonenveloped viruses by excluding capsid regions that stabilize the virus polynucleotide via electrostatic interactions. This method was applied first to viruses with known polynucleotide-binding regions (PBRs) and/or three-dimensional (3D) structures. Then, PBRs were predicted in a group of 32 unique viral …

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Seismic Performance Of Chevron-Configured Special Concentrically Braced Frames With Yielding Beams, Hayato Asada, Andrew D. Sen, Tao Li, Jeffrey W. Berman, Dawn E. Lehman, Charles W. Roeder Dec 2020

Seismic Performance Of Chevron-Configured Special Concentrically Braced Frames With Yielding Beams, Hayato Asada, Andrew D. Sen, Tao Li, Jeffrey W. Berman, Dawn E. Lehman, Charles W. Roeder

Civil and Environmental Engineering Faculty Research and Publications

Current seismic design requirements for special concentrically braced frames (SCBFs) in chevron configurations require that the beams supporting the braces be designed to resist the demands resulting from the simultaneous yielding of the tension brace and degraded, post-buckling strength of the compression brace. Recent research, including large-scale experiments and detailed finite-element analyses, has demonstrated that limited beam yielding is not detrimental to chevron braced frame behavior and actually increases the story drift at which the braces fracture. These findings have resulted in new expressions for computing beam demands in chevron SCBFs that reduce the demand in the tension brace to …

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Leading Change During The Convergence Of An Epidemic And A Pandemic, Sarah Oerther, Daniel B. Oerther Dec 2020

Leading Change During The Convergence Of An Epidemic And A Pandemic, Sarah Oerther, Daniel B. Oerther

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

As the first wave of COVID-19 cases spread around the globe in early 2020, the healthcare community adopted a medical model that emphasized the use of resources to mitigate viral spread (Oerther & Watson, 2020). Schools, churches, and businesses shutdown, and healthcare facilities – from outpatient clinics to inpatient elective surgeries – were closed or cancelled. Even long-term care facilities, such as nursing homes, limited access of visitors to patients in an attempt at mitigation. And for six months, the healthcare community focused almost exclusively on a medical response to COVID-19, securing stockpiles of ventilators and fast-tracking vaccine development.

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Robust Maximum Coverage Facility Location Problem With Drones Considering Uncertainties In Battery Availability And Consumption, Darshan Chauhan, Avinash Unnikrishnan, Miguel Figliozzi, Stephen D. Boyles Dec 2020

Robust Maximum Coverage Facility Location Problem With Drones Considering Uncertainties In Battery Availability And Consumption, Darshan Chauhan, Avinash Unnikrishnan, Miguel Figliozzi, Stephen D. Boyles

Civil and Environmental Engineering Faculty Publications and Presentations

Given a set of spatially distributed demand for a specific commodity, potential facility locations, and drones, an agency is tasked with locating a prespecified number of facilities and assigning drones to them to serve the demand while respecting drone range constraints. The agency seeks to maximize the demand served while considering uncertainties in initial battery availability and battery consumption. The facilities have a limited supply of the commodity being distributed and also act as a launching site for drones. Drones undertake one-to-one trips (from located facility to demand location and back) until their available battery energy is exhausted. This paper …

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Bond Behavior Between Steel Fiber Reinforced Polymer (Srp) And Concrete, Xingxing Zou, Lesley Sneed Dec 2020

Bond Behavior Between Steel Fiber Reinforced Polymer (Srp) And Concrete, Xingxing Zou, Lesley Sneed

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Steel fiber reinforced polymer (SRP) composite materials, which consist of continuous unidirectional steel wires (cords) embedded in a polymeric matrix, have recently emerged as an effective solution for strengthening of reinforced concrete (RC) structures. SRP is bonded to the surface of RC structures by the same matrix to provide external reinforcement. Interfacial debonding between the SRP and concrete is a primary concern in this type of application. This study aimed to investigate the bond characteristics between SRP and concrete determined by single-lap direct shear tests with different composite bonded lengths and fiber sheet densities (cord spacings). Specimens with medium density …

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