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Articles 1711 - 1740 of 4477

Full-Text Articles in Construction Engineering and Management

Optimizing The Self-Healing Efficiency Of Hydrogel Encapsulated Bacteria In Concrete, Ricardo Hungria Apr 2022

Optimizing The Self-Healing Efficiency Of Hydrogel Encapsulated Bacteria In Concrete, Ricardo Hungria

LSU Master's Theses

Calcium carbonate precipitation through microbial means is a promising pathway for concrete self-healing technologies, mainly for its microcrack sealing attributes. The main goal of this project was to study and optimize the crack healing efficiency of hydrogel encapsulated bacteria in concrete. To achieve this purpose, Bacillus pseudiformus was implemented as the bacteria strain at a concentration of 108 cells/ml. This bacterium strain along with yeast extract was combined along with three different mineral precursors corresponding to magnesium acetate, calcium lactate, and sodium lactate. All these three precursors were evaluated at two concentrations (67.76 mM/l and 75 mM/l). For each …

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The Professional Constructor, Full Issue, Volume 47, Number 01 Apr 2022

The Professional Constructor, Full Issue, Volume 47, Number 01

The Professional Constructor

No abstract provided.

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Reducing Early-Age Shrinkage Cracks Of Bridge Decks And Rails, Soumitra Das, George Morcous, Jiong Hu Apr 2022

Reducing Early-Age Shrinkage Cracks Of Bridge Decks And Rails, Soumitra Das, George Morcous, Jiong Hu

UNL Student Research Days Posters, Graduate

Early-age shrinkage cracking of concrete bridge decks and rails accelerates the penetration of water and chemicals which leads to reinforcement corrosion, delamination, and eventually spalling. All this results in shorter service life, road closure, and costly repair. Development of Low-cement concrete(LCC) mix to reduce early age shrinkage crack through aggregate grading optimization was done in this research work. This approach also reduces concrete cost ($15-$20/cyd) (15–25%) and its carbon footprint (≈15%).

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Building Services Engineering March/April 2022 Apr 2022

Building Services Engineering March/April 2022

Building Services Engineering

No abstract provided.

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Impacts Of Pandemic-Induced Material Price Escalation On Construction Estimation And Bidding, Chancellor G. Giessinger Apr 2022

Impacts Of Pandemic-Induced Material Price Escalation On Construction Estimation And Bidding, Chancellor G. Giessinger

Construction Management

The COVID-19 pandemic introduced new severe supply chain bottlenecks in the construction industry. These bottlenecks reduced the availability of a wide variety of critical construction materials, which created a scarcity that has raised material prices at an unprecedented rate and extended lead times for some materials by months. This poses new challenges for contractors with pressure from owners to deliver ongoing contracts with fixed, pre-pandemic contract pricing and for estimators seeking to bid new projects with unforeseeable future material pricing. The objective of this research to focus on contractors operating within the state of California and their primary challenges in …

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Design And Evaluation Of A Prototype Low-Damage Beam-Column Connection For Mass Timber Moment Frames, Samuel D. Richmann Mar 2022

Design And Evaluation Of A Prototype Low-Damage Beam-Column Connection For Mass Timber Moment Frames, Samuel D. Richmann

Civil and Environmental Engineering Master's Project Reports

A moment-resisting, beam-column connection for mass timber moment frames was developed, designed and tested. The design was intended to limit damage to the timber members by creation of a ductile failure mechanism in steel U-shaped flexural plates (UFPs). Using design equations developed by previous research on UFPs by Baird, et al. (2014) as well as accepted design practices from the NDS and AISC, the components were sized to eliminate failure in the timber. The connection was tested using a quasi-static lateral displacement method following the procedure outlined in section K2.4b of AISC 341-16. A vertical load was placed on the …

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Life Cycle Integration Of Building Information Modeling In Infrastructure Projects, Xingzhou Guo, Chi Tian, Jinwu Xiao, Yunfeng Chen, Jiansong Zhang Mar 2022

Life Cycle Integration Of Building Information Modeling In Infrastructure Projects, Xingzhou Guo, Chi Tian, Jinwu Xiao, Yunfeng Chen, Jiansong Zhang

Purdue Road School

No abstract provided.

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Cognitive Attention And Its Application In Countermeasures On A Curve Section, Hongyue Wu, Yunfeng Chen, Junan Shen, Weinan Gao, Mohammad Ahad, Osahon Iroghama Mar 2022

Cognitive Attention And Its Application In Countermeasures On A Curve Section, Hongyue Wu, Yunfeng Chen, Junan Shen, Weinan Gao, Mohammad Ahad, Osahon Iroghama

Purdue Road School

No abstract provided.

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To Critically Review The Use Of Screencasts For Teaching Land Surveying, Eugen Niculae, Alain Chenaux Mar 2022

To Critically Review The Use Of Screencasts For Teaching Land Surveying, Eugen Niculae, Alain Chenaux

Conference papers

Screencasting tools allow for a screen capture of the actions on a computer screen with accompanying audio. This research initially reviews through the literature how screencasting has been used pedagogically and, through this primary research, the application of an existing screencast called Screencast-O-Matic and feedback from students from both Construction Management and Geospatial Surveying Undergraduate Programmes of TU Dublin, where and how it could be deployed for the surveying classes and fieldwork during the pandemic situation. This research occurred when all Irish third-level institutions lectures and tutorials moved online, and access to survey equipment for fieldwork was severely reduced. The …

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A United States Air Force Site Selection Methodology In A Contested Agile Combat Employment Environment, Zachary T. Moer Mar 2022

A United States Air Force Site Selection Methodology In A Contested Agile Combat Employment Environment, Zachary T. Moer

Theses and Dissertations

The United States Air Force’s (USAF) Agile Combat Employment (ACE) strategy relies on host country access and underlying local infrastructure to facilitate airpower. However, numerous factors, including peer-to-peer threats, complex geopolitics, and intricate supply chain management, often complicate site access and thwart site selection decisions. When shaping the battlespace for future conflict, strategists and planners face the difficult task of identifying optimal locations to conduct adaptive basing operations given these complicating factors. Multi-Criteria Decision Analysis (MCDA) can help strategists appropriately account for competing objectives and maintain a competitive advantage with theater adversaries. This thesis presents an MCDA model that evaluates …

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Current State Of The Workforce Demographics And Knowledge Transfer Strategies In The Southeast United States, Vivek Sharma, Dhaval Gajjar, Kapil Madathil, David Davis, Shreyas Patel Mar 2022

Current State Of The Workforce Demographics And Knowledge Transfer Strategies In The Southeast United States, Vivek Sharma, Dhaval Gajjar, Kapil Madathil, David Davis, Shreyas Patel

The Professional Constructor

The construction industry is a very diverse industry due to the unique nature of projects and expertise within various construction companies driven by multiple regional/national factors. The United States Department of Labor reported 44% of the current US employed population will be above 65 in eleven years by 2028, making workforce studies and knowledge transfer a key driver in leading construction business models. This study conducted an in-depth investigation in the southeast region of the US on the current state of workforce demographics and the need for knowledge transfer within the ranks of management coupled with trade personnel. The study …

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Perceptions Of Remote Work Within The Construction Industry Resulting From The Covid-19 Pandemic In The South Central United States, Sara B. Overturf, Ben Bigelow, Matthew Reyes Mar 2022

Perceptions Of Remote Work Within The Construction Industry Resulting From The Covid-19 Pandemic In The South Central United States, Sara B. Overturf, Ben Bigelow, Matthew Reyes

The Professional Constructor

Working remotely became increasingly popular over the previous two years, given organization’s need to rapidly adjust to changing conditions as a result of the Coronavirus. It allowed companies to more easily adapt to stay-at home orders and create a safer environment for their employees. While working remotely can have a positive impact on employees, there are also challenges to overcome for both employees and organizations. This study focused on understanding both the prevalence and implementation of remote work within the commercial Construction industry to face the professional challenges resulting from the Coronavirus. This paper provides insight into companies that have …

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Educating The Construction Client: Training Strategy For Buyers Of Commercial Design And Construction Services, Michael J. Emmer Mar 2022

Educating The Construction Client: Training Strategy For Buyers Of Commercial Design And Construction Services, Michael J. Emmer

The Professional Constructor

Business owners can face a myriad of challenges when venturing into a new construction project. Most of the design and construction process is unfamiliar territory as compared to their customary business operations and owners face a wide assortment of issues when making the decision to build a new facility. Consequently, the majority of owners are entirely out of their business element when deciding to enter into the undertaking of a new building project. Since most of the risk with any given project rests with the Owner, better training and strategies for owners will lead to a higher likelihood of project …

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Using Flight Simulation As A Convenient Method For Uas Flight Assessment For Contractors, Colin Dees, Joseph M. Burgett Mar 2022

Using Flight Simulation As A Convenient Method For Uas Flight Assessment For Contractors, Colin Dees, Joseph M. Burgett

The Professional Constructor

Operating an unmanned aircraft system (UAS) for commercial purposes in the United States requires the pilot to pass the Federal Aviation Administration’s (FAA’s) knowledge exam to earn their UAS license. The exam does not include a practical component where flight proficiency is assessed. This represents a source of risk for contractors if flight proficiency is not evaluated in another way. The National Institute of Standards and Technology is a federal agency and has developed the Basic Maneuvering Test (BMT). It is the only nationally recognized UAS flight proficiency exam. While not required, the construction industry can benefit by using this …

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Critical Evaluation Of Construction Industry-Related Additive Manufacturing Research: A Scientometric Analysis, Tyler J. Brunjes Mar 2022

Critical Evaluation Of Construction Industry-Related Additive Manufacturing Research: A Scientometric Analysis, Tyler J. Brunjes

Theses and Dissertations

Review of construction-related AM literature is used to identify the advantages, challenges, and current trends of the research. Using a scientometric analysis of 522 bibliographic records, this research systematically analyzed construction related AM research to determine the key research areas and trends. Results showed that starting in 2015, the field has been growing at an exponential rate. Recent AM research focused on materials and reinforcement topics, which matched the most notable challenges of AM, which are material rheology, reinforcement, and lacking construction standards. This study provides an insight into AM research and identifies areas requiring more innovation before its commercial …

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Quantifying Project Complexity To Resource Project Managers, Jereme R. Henrard Mar 2022

Quantifying Project Complexity To Resource Project Managers, Jereme R. Henrard

Theses and Dissertations

This research develops a multi-criteria decision analysis model to quantify project complexity and inform decision-makers in resource-constrained organizations with the Tyndall Program Management Office (PMO) as a case study. The complexity score is used as a risk metric to determine the appropriate number of skilled or novice project managers to effectively manage the PMO portfolio to mitigate cost and schedule overruns. The research provides an innovative approach to consider manning levels at the PMO and other project management-focused organizations/sections.

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Investigation Into Engineering Change Order Costs And Appropriate Rules-Of-Thumb, Kaiana M. Miller Mar 2022

Investigation Into Engineering Change Order Costs And Appropriate Rules-Of-Thumb, Kaiana M. Miller

Theses and Dissertations

Engineering Change Orders (ECO) are technical requirements changes to existing contracts. To account for the potential increase in contract costs stemming from ECOs, current acquisition practice is to estimate a dollar value to hold in management reserve (MR) in case of ECO occurrence. Estimators often rely on rules-of-thumb when developing these estimates. Specifically, estimators use a 10% rule-of-thumb for estimating MR contract costs in the Development life cycle phase and a 5% rule-of-thumb for contracts in the Production or O&S life cycle phase. However, no empirical data supports or validates these 10% and 5% figures. Using a new data source, …

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Investigating Student Interest In The Addition Of A Construction Law Topics Course, Flint D. Merrill-Gehrke Mar 2022

Investigating Student Interest In The Addition Of A Construction Law Topics Course, Flint D. Merrill-Gehrke

Construction Management

In the Construction Management program, our goal is to prepare for the responsibilities imposed upon us during a construction project. A major responsibility among these is navigating the complex legal relationships inherent to a construction project. While Cal Poly offers one Construction Law course, students are underprepared for what they will face. This project is designed to gauge interest from the Cal Poly Construction Management student body in the addition of a Construction Law topics course. It also aims to understand if additional legal studies would better prepare students for their entrance into the industry. Students were asked to answer …

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Impact Of Covid-19 On Sense Of Community / Student Engagement, Aaron Sauer, Richard Gebken, Richard Bruce Mar 2022

Impact Of Covid-19 On Sense Of Community / Student Engagement, Aaron Sauer, Richard Gebken, Richard Bruce

The Professional Constructor

The spring of 2020 was a time of unprecedented change for higher education institutions. The COVID-19 pandemic forced schools to re-think instructional delivery and the undergraduate experience as they implemented measures to protect students, faculty, and staff. Unraveling the impact of the pandemic on higher education will take many years. This study investigated how the institutional response in the return to campus following the pandemic influenced sense of community, a component of student engagement. A previously developed instrument was delivered at two construction management programs in the U.S. Midwest before and after the pandemic. The two schools were similar in …

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Sustainable Building Techniques In Levi’S Stadium: A Case Study, Sean Zweigle Mar 2022

Sustainable Building Techniques In Levi’S Stadium: A Case Study, Sean Zweigle

Construction Management

This study aimed to analyze the sustainability of Levi’s Stadium in Santa Clara, California through an analysis of its Leadership in Energy and Environmental Design or LEED certification. Levi’s Stadium was the first professional sports stadium to receive LEED Gold certification in 2014, at a time where a focus on green building practices was becoming an industry standard. This analysis aims to determine what avenues the project team employed to ensure certification, including various standout features and strategies. Additionally, the study investigates the scorecard used to award points towards LEED certification, highlighting categories emphasized in design and construction and those …

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A Case Study Comparing Panelization And Modularization Construction Methods, Tuukka Juhani Jaakkola Mar 2022

A Case Study Comparing Panelization And Modularization Construction Methods, Tuukka Juhani Jaakkola

Construction Management

Construction industry is notoriously inefficient industry with a lot of room for improvement. Construction companies are constantly looking to increase their efficiency. NCC Finland decided to explore the method of modular construction as part of the efforts to increase production. NCC also happened to build a similarly sized project with the more traditional method of panelization and tilt-up construction. This Case study explores the experience of NCC as the general contractor of both projects. The aim is to understand the differences of the challenges and benefits experienced by the team from NCC. The findings show that Modular construction offers wide …

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The Development And Evaluation Of A New Trench Safety Equipment, Joshua D. Clesi Mar 2022

The Development And Evaluation Of A New Trench Safety Equipment, Joshua D. Clesi

Construction Management

One of the most dangerous works in construction is trench work and excavation. Fatalities that range from permanent injuries to death happen to construction workers every day, not having a lot of alternatives to prevent unfortunate incidents such as cave-ins and shoring failures. What this paper is proposing is a new invention that may solve this ongoing problem with trench safety. The idea is a crane-like lift attached to the back of a pick-up truck that will vertically lift people out of the trenches in a matter of seconds before shoring collapses or the trench caves in. This project primarily …

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Analysis Of The Potential Structure Of A Peer Mentorship Program For The Construction Management Department At Cal Poly, Slo, Jane C. Runte Mar 2022

Analysis Of The Potential Structure Of A Peer Mentorship Program For The Construction Management Department At Cal Poly, Slo, Jane C. Runte

Construction Management

The Construction Management Department at Cal Poly, SLO has no structured peer mentorship program as of 2022. The department has attempted to implement a peer mentoring program in the past but none with longevity. This paper analyzes data collected from the students of the CM Department through a qualitative and quantitative survey regarding the need and structure of a peer mentorship program to begin again. The survey’s main goal was to gain an understanding of whether or not the students think the department should implement a peer mentorship program and the structure that the student body would find most beneficial …

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Creating A Demolition Topic Course, Eli Jeremiah Lipton Mar 2022

Creating A Demolition Topic Course, Eli Jeremiah Lipton

Construction Management

Demolition is as old as construction itself and has always played an integral role in the construction process. That is, however, not the reality of the Construction Management (CM) program at California Polytechnic State University (Cal Poly). The current curriculum covers a wide range of topics and prepares students to be able to join any residential, commercial, and heavy civil projects. These projects all have something in common, the demolition process. Undergraduates are not prepared with the basic demolition knowledge to be successful in the industry. Demolition is overlooked at Cal Poly and is not a primary focus in any …

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The Preconstruction Of Sustainable Housing In Muhanga, Rwanda, Rachael Worstman Mar 2022

The Preconstruction Of Sustainable Housing In Muhanga, Rwanda, Rachael Worstman

Construction Management

This project involved the designing and building process of a sustainable, environmentally sound housing option designed for the people of Muhanga, Rwanda. This project was initially inspired by the Earthships built in New Mexico. During the design process the Earthships' design and materials used was evaluated, then altered to better suit Rwanda based on the available natural resources and needs of the people. Rwandans have endured a traumatic history and still experiences struggle today. An example of this is the anti-thatching campaign in 2011 that left thousands of people homeless as they were forced out of their unsafe homes. One …

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Living Off The Grid With Renewable Energy: A Case Study, Jake Reid O'Balle Mar 2022

Living Off The Grid With Renewable Energy: A Case Study, Jake Reid O'Balle

Construction Management

The trend towards green, sustainable living is on the rise and the benefits are continuing to make noise in the world of homeowners. In this project, the benefits of renewable energy and consumer preferences were analyzed and applied to off-grid living in the form of a case study. It was found that the majority of homebuyers are concerned about the environment and wanted an environmentally friendly home but are not willing to pay more in order to achieve these desires. This information spurred the need for a detailed assessment of the feasibility of sustainable off-grid living. After conducting extensive research, …

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Introduction To A Demolition Topics Course, Scott Martin Mar 2022

Introduction To A Demolition Topics Course, Scott Martin

Construction Management

The California Polytechnic State University (Cal Poly) Construction Management (CM) program was created to allow graduates the opportunity to work effectively in practically every part of the construction industry. The curriculum covers a wide range of topics and prepares students with the ability to join various projects, such as residential, commercial, and heavy civil projects. What these projects all have in common, a topic almost entirely ignored at Cal Poly but nonetheless very important and relevant, is demolition in the construction industry. By offering a course focused entirely on the demolition process, principles, and safety, students will be better prepared …

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The Integration Of Virtual Reality In The Commercial Construction Industry, Justin T. Gin Mar 2022

The Integration Of Virtual Reality In The Commercial Construction Industry, Justin T. Gin

Construction Management

Virtual reality has recently been spreading throughout the commercial construction industry rapidly. Some of its capabilities are safety training, helping spot Americans with Disabilities Act (ADA) issues, logistics planning, and virtual walkthroughs. Many construction companies were starting to utilize virtual reality's advantages until COVID-19 hit. The initial wave of COVID slowed down construction in general as well as the need or use of virtual reality. Now, some companies are worried about the health risks and implementation issues that virtual reality headsets might bring while other companies are optimistic about the future of virtual reality. This report will explore the different …

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Gnss Construction Surveying, Jake C. Carter Mar 2022

Gnss Construction Surveying, Jake C. Carter

Construction Management

This Senior Project examines world of cutting-edge surveying technology which will be implemented into Cal Poly’s Construction Management 239 Construction Surveying course. It creates a field exercise for student learning that mimics the application the of Global Navigation Satellite Systems (GNSS) and how they are used in the construction industry. The new exercise includes the use of GNSS receivers, base hubs, field computers, and a Topcon MAGNET Field application. From the research phase to the training/learning phase to the implementation of the assignment into the course this project embodied the “Learn-By-Doing” philosophy. This project was successful in demonstrating how GNSS …

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Sustainability Within Asphalt And Concrete Paving Systems, Matthew Clapp Mar 2022

Sustainability Within Asphalt And Concrete Paving Systems, Matthew Clapp

Construction Management

The construction industry is continually determining ways to make the building process more streamlined, cost efficient and, more recently, sustainable. As the commercial construction industry becomes more structured, industry leaders are looking for new ways to make installation of materials and cleanup more environmentally friendly. Construction is responsible for a large portion of the overall harm toward the environment. Although the commercial sector has made great strides toward this effort in the last fifty years with programs such as LEED, there is still much to be taken into consideration. The goal of this research is to analyze the current trends …

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