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Articles 451 - 480 of 2167
Full-Text Articles in Civil and Environmental Engineering
Skilled Labor Challenges And Automation In The Construction Industry, Olugbenro Ogunrinde, Rapheal Ojelabi, Opeyemi Oyeyipo
Skilled Labor Challenges And Automation In The Construction Industry, Olugbenro Ogunrinde, Rapheal Ojelabi, Opeyemi Oyeyipo
Mountain Plains Business Conference
The construction industry remains one of the most labor-intensive industries worldwide, creating an average gross domestic product (GDP) of 8% for the global economy and helping reduce unemployment. However, the last few years have brought a plague of skilled labor shortage and retirement, the most recent pandemic also playing a part in hastening retirement due to the present age cohort (baby boomers). Therefore, the need to begin to source viable alternatives to mitigate these issues that could be catastrophic is critical. One possible option is automation, but the industry remains lethargic toward innovation adoption and its use. Past and present …
Upcycling Steel Slag In Producing Eco-Efficient Iron–Calcium Phosphate Cement, Yue Ma, Yunlong Luo, Hongyan Ma, Xintao Zhou, Zhongqiu Luo
Upcycling Steel Slag In Producing Eco-Efficient Iron–Calcium Phosphate Cement, Yue Ma, Yunlong Luo, Hongyan Ma, Xintao Zhou, Zhongqiu Luo
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In the present study, steel slag powder (SSP) was utilized as the raw material to prepare iron-calcium phosphate cement (ICPC) by reacting with ammonium dihydrogen phosphate (ADP). The influences of the raw materials (SSP/ADP) mass ratios ranging from 2.0 to 7.0 on the properties and microstructures of ICPC pastes were investigated. The compressive strengths of ICPC pastes at all ages firstly increased and then decreased with the increase of SSP/ADP, and the SSP/ADP of 6.0 gave the highest strength. Crystalline mundrabillaite and amorphous phases [i.e. Fe(OH)3, Al(OH)3 and H4SiO4] were formed as the …
Homogenous Flow Performance Of Steel Fiber-Reinforced Self-Consolidating Concrete For Repair Applications: Developing A New Empirical Set-Up, Naimeh Nouri, Masoud Hosseinpoor, Ammar Yahia, Kamal Khayat
Homogenous Flow Performance Of Steel Fiber-Reinforced Self-Consolidating Concrete For Repair Applications: Developing A New Empirical Set-Up, Naimeh Nouri, Masoud Hosseinpoor, Ammar Yahia, Kamal Khayat
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
In this study, a new empirical Square-Box test was employed to evaluate the homogeneous flow performance of fiber-reinforced self-consolidating concrete (FR-SCC) under confined-flow conditions that are typical of repair applications. The Square-Box set-up consisted of a closed-circuit box, providing 2.4-m flow distance and a closed-surface cross section of 100-mm width and 200-mm height, equipped with 0 and 4 rows of reinforcing bar grids with 45-mm clear spacing. The flow performance was assessed in terms of dynamic stability and passing ability. The investigated mixtures were considered as diphasic suspensions of fiber-coarse aggregate (F-A > 5 mm) in suspending mortars containing particles finer …
Synergistic Effect Of Shrinkage Mitigating Materials On Rheological Properties Of Flowable And Thixotropic Cement Paste, Kamran Aghaee, Ricarda Sposito, Kamal Khayat
Synergistic Effect Of Shrinkage Mitigating Materials On Rheological Properties Of Flowable And Thixotropic Cement Paste, Kamran Aghaee, Ricarda Sposito, Kamal Khayat
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
This study investigates the effect of individual and combined additions of CaO-based expansive agent (EA), shrinkage reducing admixture (SRA), and super absorbent polymer (SAP) on key characteristics of flowable cement paste mixtures proportioned with a water-to-cement ratio of 0.40. Of special interest is the effectiveness of these admixtures to mitigate shrinkage of cementitious materials for 3D printing. Static and dynamic yield stress, plastic and apparent viscosities, and thixotropy were evaluated at 20-min intervals up to 90 min. Compressive strength development and autogenous shrinkage were also determined. A factorial design approach was developed to evaluate the synergetic effects of the shrinkage …
Spiral Deployment Of Optical Fiber Sensors For Distributed Strain Measurement In Seven-Wire Twisted Steel Cables, Post-Tensioned Against Precast Concrete Bars, Yanping Zhu, Genda Chen
Spiral Deployment Of Optical Fiber Sensors For Distributed Strain Measurement In Seven-Wire Twisted Steel Cables, Post-Tensioned Against Precast Concrete Bars, Yanping Zhu, Genda Chen
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
On-time monitoring and condition assessments of steel cables provide mission-critical data for informed decision making, ensuring the structural safety of post-tensioned concrete structures. This study aimed to develop a spiral deployment scheme of distributed fiber optic sensors (DFOS) and to monitor/assess the post-tensioned force in seven-wire twisted steel cables, based on the pulse-pre-pump Brillouin optical time domain analysis. Each DFOS was placed in a spiral shape between two surface wires of a steel cable and glued to the steel cable by epoxy. Image observations were conducted to investigate the entireness and bonding condition between the optical fiber and the steel …
Characterizing And Modeling The Coupled Hydro-Mechanical Cyclic Behavior Of Unsaturated Soils Using Constant Water Content Oedometer And Direct Shear Tests, Beshoy Riad, Xiong Zhang
Characterizing And Modeling The Coupled Hydro-Mechanical Cyclic Behavior Of Unsaturated Soils Using Constant Water Content Oedometer And Direct Shear Tests, Beshoy Riad, Xiong Zhang
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Most transportation infrastructures are constructed on compacted soils that are typically unsaturated above the groundwater table. The soils are subjected to cyclic traffic loadings and seasonal wetting–drying cycles. Although problems associated with unsaturated soils are ubiquitous in the US, coupled hydro-mechanical analysis is rarely included in the design/analysis of transportation geosystems. This can be attributed to two main reasons: (a) there are no simple devices/methods which can be used to rapidly characterize stress–strain behavior for unsaturated soils, and (b) there is a lack of a constitutive model to study coupled hydro-mechanical cyclic behavior for unsaturated soils in a consistent way. …
Benefits And Drawbacks Of Using Multiple Shrinkage Mitigating Strategies On Performance Of Fiber-Reinforced Mortar, Kamran Aghaee, Kamal Khayat
Benefits And Drawbacks Of Using Multiple Shrinkage Mitigating Strategies On Performance Of Fiber-Reinforced Mortar, Kamran Aghaee, Kamal Khayat
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Shrinkage mitigating strategies have been successfully used to prevent concrete cracking. Numerous studies have demonstrated the efficiency of shrinkage mitigating materials (SMM), such as expansive agent (EA), shrinkage reducing admixture (SRA), and superabsorbent polymer (SAP) on reducing shrinkage and cracking; however, few studies have addressed the limitations of using these materials. In addition, the mechanism of negative effect on microstructure and mechanical properties when these materials are used at high contents or in combinations is not well defined. This study investigates the effect of CaO-based EA, SRA, and SAP on compressive strength development, fiber pull-out strength, and shrinkage of fiber-reinforced …
A Novel Iron Phosphate Cement Derived From Copper Smelting Slag And Its Early Age Hydration Mechanism, Yunlong Luo, Xintao Zhou, Zhongqiu Luo, Hongyan Ma, Yu Wei, Qin Liu
A Novel Iron Phosphate Cement Derived From Copper Smelting Slag And Its Early Age Hydration Mechanism, Yunlong Luo, Xintao Zhou, Zhongqiu Luo, Hongyan Ma, Yu Wei, Qin Liu
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Copper slag (CS), a by-product of copper smelting, is normally stockpiled, leading to wastes of resource and space as well as environment pollution. It has not been massively reutilized as a supplementary cementitious material in Portland cement due to its low reactivity. In the present study, CS is for the first time utilized as the base component to prepare an iron phosphate cement (IPC) by reacting with ammonium dihydrogen phosphate (ADP) at room temperature. The influence of the raw materials mass ratio (CS/ADP) on the microstructure and performance of IPC pastes are investigated. It is found that the compressive strength …
Studying Dynamic Pricing In Electrical Power Markets With Distributed Generation: Agent-Based Modeling And Reinforcement-Learning Approach, Gasser G. Ali, Islam H. El-Adaway, Charles Sims, J. Scott Holladay, Chien Fei Chen
Studying Dynamic Pricing In Electrical Power Markets With Distributed Generation: Agent-Based Modeling And Reinforcement-Learning Approach, Gasser G. Ali, Islam H. El-Adaway, Charles Sims, J. Scott Holladay, Chien Fei Chen
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Distributed generation (DG) refers to small-scale generation resources that are located at or near end-consumers, such as photovoltaic (PV) solar systems. DG systems have become increasingly popular in recent years owing to their economic efficiency, reliability, and sustainability. However, the increasing adoption of DG is creating new obstacles for system operators due to the uncertainty in forecasting future demand. One concern is the possibility of facing a utility death spiral as a feedback loop between, on the one hand, the increasing adoption of DG and increasing electricity rates to cover generation and transmission overheads with, on the other hand, reduced …
The Professional Constructor, Full Issue, Volume 47, Number 02
The Professional Constructor, Full Issue, Volume 47, Number 02
The Professional Constructor
No abstract provided.
Artificial Intelligence In Civil Infrastructure Health Monitoring—Historical Perspectives, Current Trends, And Future Visions, Tarutal Ghosh Mondal, Genda Chen
Artificial Intelligence In Civil Infrastructure Health Monitoring—Historical Perspectives, Current Trends, And Future Visions, Tarutal Ghosh Mondal, Genda Chen
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Over the past 2 decades, the use of artificial intelligence (AI) has exponentially increased toward complete automation of structural inspection and assessment tasks. This trend will continue to rise in image processing as unmanned aerial systems (UAS) and the internet of things (IoT) markets are expected to expand at a compound annual growth rate of 57.5% and 26%, respectively, from 2021 to 2028. This paper aims to catalog the milestone development work, summarize the current research trends, and envision a few future research directions in the innovative application of AI in civil infrastructure health monitoring. A blow-by-blow account of the …
Wastewater-Informed Public Health Intervention Playbook
Wastewater-Informed Public Health Intervention Playbook
Sustain Magazine
As the SARS-CoV-2 pandemic quickly spread from country to country and continent to continent in 2020, governments and scientists needed a way to track COVID-19 through populations in order to position public health interventions in the most impactful locations. Having a decision-based risk framework may help to guide policy creation that could minimize or prevent possible outbreaks and surges of infection within communities. The University of Louisville in partnership with Louisville’s Department of Public Health and Wellness tested this strategy in 2021 and 2022. This Wastewater-Informed Public Health Intervention Playbook describes the decisions and actions of that academic and public …
Common Ground Newsletter Fall 2022, Missouri University Of Science And Technology
Common Ground Newsletter Fall 2022, Missouri University Of Science And Technology
Common Ground
- Summer camps returned in person
Flexural Strength Of Innovative Thin-Walled Composite Cold-Formed Steel/Pe-Ecc Beams, Ahmed Sheta, Xing Ma, Yan Zhuge, Mohamed Elgawady, Julie Mills, Elsayed Abd-Elaal
Flexural Strength Of Innovative Thin-Walled Composite Cold-Formed Steel/Pe-Ecc Beams, Ahmed Sheta, Xing Ma, Yan Zhuge, Mohamed Elgawady, Julie Mills, Elsayed Abd-Elaal
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
A detailed experimental investigation on the flexural behaviour of an innovative precast composite element combining cold-formed steel (CFS) and engineered cementitious composites (ECC) is presented in this paper. Bonding ECC to the lightweight thin-walled CFS sections enhanced the buckling, bearing, and torsional properties of the composite sections. The proposed composite system will be used as precast flexural members in framed structures with large spans or as a rehabilitation approach for corroded cold-formed and hot-rolled steel flexural members. Simply supported beams with comparatively long spans with span-to-depth ratios of 6.83 and 13.48 were installed back-to-back and tested under a 4-point loading …
Some New Insights For Inferring Diapycnal (Irreversible) Diffusivity In Stably Stratified Turbulence, Amrapalli Garanaik, Subhas Karan Venayagamoorthy
Some New Insights For Inferring Diapycnal (Irreversible) Diffusivity In Stably Stratified Turbulence, Amrapalli Garanaik, Subhas Karan Venayagamoorthy
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
New insight for inferring diapycnal diffusivity in stably stratified turbulent flows is obtained based on physical scaling arguments and tested using high-resolution direct numerical simulation data. It is shown that the irreversible diapycnal diffusivity can be decomposed into a diapycnal length scale that represents an inner scale of turbulence and a diapycnal velocity scale. Furthermore, it is shown that the diapycnal length scale and velocity scale can be related to the measurable Ellison length scale (LE) that represents outer scale of turbulence and vertical turbulent velocity scale (w ′) through a turbulent Froude number scaling analysis. The turbulent Froude number …
Investigation On Chloride Binding Capacity And Stability Of Friedel's Salt In Graphene Oxide Reinforced Cement Paste, Wu Jian Long, Xuanhan Zhang, Gan Lin Feng, Jing Xie, Feng Xing, Biqin Dong, Jinrui Zhang, Kamal Khayat
Investigation On Chloride Binding Capacity And Stability Of Friedel's Salt In Graphene Oxide Reinforced Cement Paste, Wu Jian Long, Xuanhan Zhang, Gan Lin Feng, Jing Xie, Feng Xing, Biqin Dong, Jinrui Zhang, Kamal Khayat
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
Chloride binding capacity is one of the important factors affecting chloride induced rebar corrosion in reinforced concrete structures. Moreover, the stability of Friedel's salt will also affect the chloride binding capacity of cement-based materials. This study investigates the effect of graphene oxide (GO) on the chloride binding capacity of cement paste and stability of Friedel's salt under different pH conditions. Experiments of X-ray diffraction (XRD), Thermogravimetric analyzer (TGA), Scanning electron microscope (SEM) and Energy dispersive spectroscopy (EDS) were performed to analyze the phase assemblage, micro morphology, element ratio and the enhanced mechanisms. Results showed that the 0.2 wt% GO addition …
Best Practices For Reducing Construction Accidents Involving Hispanic Construction Workers, Michael E. Asuquo, Khalid Siddiqi
Best Practices For Reducing Construction Accidents Involving Hispanic Construction Workers, Michael E. Asuquo, Khalid Siddiqi
The Professional Constructor
The objective of this study was to determine best practices for reducing accidents among Hispanic construction workers. It was hypothesized that language barrier between the Hispanics and American workers contributed immensely to high rate of construction accidents on industrial projects. Accident case studies and questionnaire survey were both used. Data was collected through semi-structured interviews with Hispanic workers involved in industrial construction projects in Metro Atlanta. Findings from the study concluded that most accidents involving Hispanic workers were caused due to lack of communication from supervisors, ignorance of workers on work procedures, lack of equipment training, and worker negligence. Language …
Construction Management Internship: A Key Opportunity For Assessment And Continuous Curriculum Improvement, James S. Vaux, Bree Dority, Dana E. Vaux
Construction Management Internship: A Key Opportunity For Assessment And Continuous Curriculum Improvement, James S. Vaux, Bree Dority, Dana E. Vaux
The Professional Constructor
The internship is an integral part of most Construction Management curricula. Studies have noted the importance and reciprocal value of internships for the student, the employer, and the academic program. However, to date, no studies have specifically outlined the value internships provide to the CM program for assessment and evaluation. This paper examines the value of the CM internship as an indirect measure to assess and incorporate change into program curricula. With 10 years of qualitative and quantitative data collected from CM student interns, industry employers, and university internship supervisors, this study supports that CM internships are a valuable tool …
Building Services Engineering September/October 2022
Building Services Engineering September/October 2022
Building Services Engineering
No abstract provided.
Stick Built Vs. Precut Wall Framing For New Home Construction: A Comparison Of Framing Labor Hours, Waste Hauls, And Purchase Orders, Eric A. Holt, Mark Laliberte, Tristan Grant, Jordan Dentz
Stick Built Vs. Precut Wall Framing For New Home Construction: A Comparison Of Framing Labor Hours, Waste Hauls, And Purchase Orders, Eric A. Holt, Mark Laliberte, Tristan Grant, Jordan Dentz
The Professional Constructor
Due to many trends in the construction industry (material cost increase, labor shortages, supply chain issues, pandemic, market demand outpacing supply), the homebuilding industry is looking for alternative ways to frame homes. In response to the National Housing Endowment (NHE) Request for Proposal, the researchers reviewed the literature on the housing market’s current state regarding the scale and scope of the skilled construction framers shortage and the current market share of single-family framing method; stick-built vs. precut framing packages. Working with industry partners, the team analyzed time studies for multiple new home builds. It was found that precut wall framing …
Total Cost Of Ownership Of Battery-Powered Vs. Hardwired Sensor Faucets In Commercial And Educational Construction Projects, Marie Patterson, Blake Wentz
Total Cost Of Ownership Of Battery-Powered Vs. Hardwired Sensor Faucets In Commercial And Educational Construction Projects, Marie Patterson, Blake Wentz
The Professional Constructor
Owners who are pursing the construction of a new commercial building are becoming increasingly more interested in the sustainability, energy efficiency and life cycle costs of their proposed project. These owners are asking designers and construction companies to develop innovative strategies to lower their utility use and total cost in their projects. One area of opportunity to meet this owner need is the decision to use sensor lavatory faucets that are either battery-powered or hardwired.Several construction projects of various types and locations were analyzed to determine the total cost of ownership of both types of sensor faucets over a 12-year …
Between Resiliency And Adaptation, Catherine Joseph
Between Resiliency And Adaptation, Catherine Joseph
IntAR Interventions Adaptive Reuse
No abstract provided.
Water As Medium Adapting Water Towers, Inge Donné, Bie Plevoets
Water As Medium Adapting Water Towers, Inge Donné, Bie Plevoets
IntAR Interventions Adaptive Reuse
No abstract provided.
A Metropolitan Park Of Water, Renzo Lecardane, Paola La Scala
A Metropolitan Park Of Water, Renzo Lecardane, Paola La Scala
IntAR Interventions Adaptive Reuse
No abstract provided.
Environmental Identity The São Paulo Rivers Case, Anne Schraidber
Environmental Identity The São Paulo Rivers Case, Anne Schraidber
IntAR Interventions Adaptive Reuse
No abstract provided.
T-House Water As Medium In Interventions And Adaptive Reuse, Katherine Bambrick Ambroziak, Brian Ambroziak
T-House Water As Medium In Interventions And Adaptive Reuse, Katherine Bambrick Ambroziak, Brian Ambroziak
IntAR Interventions Adaptive Reuse
No abstract provided.
The Blue Line Reusing Traditional Rural Water Management Systems, Francesco Garofalo
The Blue Line Reusing Traditional Rural Water Management Systems, Francesco Garofalo
IntAR Interventions Adaptive Reuse
No abstract provided.
The Hammam Of Erbil Citadel A Confluence Of Past, Present, And Future, Ahmed Abbas, Karen Lens
The Hammam Of Erbil Citadel A Confluence Of Past, Present, And Future, Ahmed Abbas, Karen Lens
IntAR Interventions Adaptive Reuse
No abstract provided.
(Re)Made By Water Obsolescence, Urban Nomadism And The New World Mall, Bangkok, Gregory Marinic
(Re)Made By Water Obsolescence, Urban Nomadism And The New World Mall, Bangkok, Gregory Marinic
IntAR Interventions Adaptive Reuse
No abstract provided.
The Oyster Blocks Project Subaqueous Interventions For Non-Humans, Michael Leighton Beaman
The Oyster Blocks Project Subaqueous Interventions For Non-Humans, Michael Leighton Beaman
IntAR Interventions Adaptive Reuse
No abstract provided.