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Articles 5971 - 6000 of 39790

Full-Text Articles in Civil and Environmental Engineering

Flexural Testing Of Precast Reinforced Concrete Bridge Slabs, Evaluation Of Deterioration And Strengthening Applications, Alyssa Leaman Dec 2022

Flexural Testing Of Precast Reinforced Concrete Bridge Slabs, Evaluation Of Deterioration And Strengthening Applications, Alyssa Leaman

All Theses

This thesis investigates the strength of flat precast concrete slabs that were taken from decommissioned South Carolina bridges. The specimens tested spanned 14 ft (4.3 m) or 15 ft (4.6 m), were 5 ft (1.5 m) or 5.5 ft (1.7 m) wide, and 8.25 in (210 mm) thick. In South Carolina, there are approximately 3000 similar bridges that use these slab members. Testing was conducted to determine the flexural capacity of “typical” slabs and the residual strength of slabs having visible deterioration of both the rebar and the concrete. For the slabs that were load rated below the new standards, …

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Deicer Salt-Scaling Resistance Of Concrete Using Recycled Concrete Aggregates Pretreated By Silica Fume Slurry, Hossein Sasanipour, Farhad Aslani, Javad Taherinezhad Dec 2022

Deicer Salt-Scaling Resistance Of Concrete Using Recycled Concrete Aggregates Pretreated By Silica Fume Slurry, Hossein Sasanipour, Farhad Aslani, Javad Taherinezhad

Research outputs 2022 to 2026

Highlights: - Salt-scaling resistance in the presence of recycled concrete aggregates, - A strong bond between RCAs and new mortar was obtained after a freeze-thaw test, - Pulse velocity after exposure to freezing-thawing cycles negligibly decreased, - The scaling rate increased with the increase in the water–cement ratio, - The electrical resistivity of concrete after exposure to cycles has been investigated. Concrete wastes such as recycled concrete aggregates (RCA) make up a significant part of construction and demolition waste (C&DW) which can be used to minimize usage of natural aggregates and reduce carbon footprint. This paper studies the salt-scaling resistance …

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Evaluation Of Relationship Between Sulfate Content And Electrical Resistivity, Zobair Ahmed Dec 2022

Evaluation Of Relationship Between Sulfate Content And Electrical Resistivity, Zobair Ahmed

Civil Engineering Theses - Archive

Texas soils typically have sulfate content due to certain geologic formation types. Soil sulfate needs to be identified and quantified to minimize damage to infrastructure caused by sulfate-induced heave. Electrical Resistivity Imaging can identify the presence of sulfate content in the soil. Electrical Resistivity Imaging (ERI) is a non-destructive and fast way of obtaining continuous soil substructure profiles. Moisture fluctuations and soil heterogeneities can be found using an ERI approach. As a result, ERI is growing in popularity as a tool in geotechnical engineering, yet at the moment, it only offers qualitative data. It can be challenging to determine quantitative …

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Evaluating The Influence Of A Droplet Spraying/Misting System To Enhance Ammonia Volatilization From A Leachate Storage Pond: A Case Study At The Three Rivers Solid Waste Authority, Kaitlen Drafts, Suzie Boxman, Scott Ribes, Mike Terry, Bryan Staley, Joseph Flora, Nicole Berge Dec 2022

Evaluating The Influence Of A Droplet Spraying/Misting System To Enhance Ammonia Volatilization From A Leachate Storage Pond: A Case Study At The Three Rivers Solid Waste Authority, Kaitlen Drafts, Suzie Boxman, Scott Ribes, Mike Terry, Bryan Staley, Joseph Flora, Nicole Berge

Faculty Publications

The Three Rivers Solid Waste Authority (TRSWA) operates a MSW landfill outside Jackson, South Carolina (USA) at which leachate ammonia concentrations are of concern. The landfill operates a droplet spraying/misting system (known as the Lilypad system) in their pond to enhance both leachate evaporation and, possibly, ammonia volatilization. The overall goals of this study were to determine the fate of nitrogen in the pond and to ultimately quantify the role the Lilypad system plays in enhancing ammonia removal. To accomplish the study goals, an empirical model based on collected leachate and mist samples, climatological data, and pond hy-draulic data was …

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Erosion And Resuspension Of Cohesive Sediments In Coastal Louisiana, Laith Qasem Shamaileh Dec 2022

Erosion And Resuspension Of Cohesive Sediments In Coastal Louisiana, Laith Qasem Shamaileh

LSU New Orleans Theses and Dissertations

The research presented in this study is motivated by the need to improve the predictions of cohesive sediment erosion and subsequent transport. In addition, the knowledge of the geotechnical engineering soil properties related to the erosion of sediments in coastal Louisiana has broad implications as these properties are used in transport models guiding the current restoration efforts. The erosion measuring device used in the study is the Cheng-Han Tasi and Wilbert Lick Shaker. Previous studies have been conducted before using the Shaker, but challenges with the calibration of the shear stress hampered the resuspension results produced by the Shaker. Therefore, …

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Numerical Simulation Of Hydrodynamic Forces On Riverine And Coastal Bridges Subjected To Extreme Weather Events, Fahad Pervaiz Dec 2022

Numerical Simulation Of Hydrodynamic Forces On Riverine And Coastal Bridges Subjected To Extreme Weather Events, Fahad Pervaiz

Civil Engineering Dissertations - Archive

ABSTRACT: Recent bridge failures due to hurricane-generated storm surges and riverine flood events have highlighted the vulnerability of bridge infrastructure to extreme hydrodynamic loading. In addition to posing an immediate risk to human life, bridge failures can hinder evacuation planning and emergency response efforts. Changes in flood frequency and intensity due to climate change and urbanization may alter the hydrodynamic conditions along urban streams, further stressing bridge infrastructure designed based on historical flow conditions. As a result, quantifying the structural response and stability of bridges under current and future hydrodynamic conditions is crucial to improving transportation safety and efficiency. This …

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Microplastic Risk Characterization Of Plastic Road, Md Shams Razi Shopnil Dec 2022

Microplastic Risk Characterization Of Plastic Road, Md Shams Razi Shopnil

Civil Engineering Dissertations - Archive

In recent past, the act of waste recycling has been diversified in manifolds across the world leading to evolution of newer recycling technique and fresh recycled product. Albeit plastic is one of those waste materials which is getting extremely difficult to get substantially recycled because of its record-breaking production, consumption, and its wide range of variations in properties ultimately leading to substandard recycling status of plastics globally. This seemingly poor status of waste plastics recycling against the gargantuan amount of fresh plastic products being added to consumer stream gives rise to a menacing one directional problem: Plastic Pollution, which is …

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Reuse Of Recycled Plastic For Subgrade Treatment, Jerin Tasnim Dec 2022

Reuse Of Recycled Plastic For Subgrade Treatment, Jerin Tasnim

Civil Engineering Theses - Archive

Disposal of solid waste becomes a global issue due to it contains a large amount of non- degradable polymers and may lead to many environmental issues. With the scarcity of space for landfilling and due to ever increasing cost, finding ways to handle these wastes without endangering the environment is crucial. One of these methods is to use plastic wastes as one of the pavement materials. In this study, a new method of subgrade soil stabilization of pavement is proposed where soil will be stabilized by mixing only plastic with soil for the treatment of subgrade. In order to demonstrate …

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Field Monitoring Of Joint-Less Curved Integral Abutment Bridge In Nebraska, Ramin Ziaei, Yusuf Alhowaidi, Chungwook Sim, Jongwan Eun, Seunghee Kim, Chung Rak Song Dec 2022

Field Monitoring Of Joint-Less Curved Integral Abutment Bridge In Nebraska, Ramin Ziaei, Yusuf Alhowaidi, Chungwook Sim, Jongwan Eun, Seunghee Kim, Chung Rak Song

Nebraska Department of Transportation: Research Reports

The research objective of this project is to study the behavior of the curved full integral abutment bridge designed in Nebraska through field monitoring and numerical simulation to 1) understand and model the complex short-term and long-term behavior of curved integral abutment bridges, 2) evaluate if the details provided in Nebraska (pile embedment over 4 ft into the abutment) can be expanded for wider design and construction practices (longer spans and larger curvature for curved bridges), and 3) better maintain existing full curved integral bridges in Nebraska based on the findings of this study (revise and optimize design, if needed). …

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Dynamic Analysis, Characterization, And Design Of Rigid-Flex Pcb Robotics, John Bell Dec 2022

Dynamic Analysis, Characterization, And Design Of Rigid-Flex Pcb Robotics, John Bell

All Dissertations

The era of space exploration is driven by and fuels large advances in technological progress.
Over the last decade, engineering practices for spacecraft, space structures, robotics, software and
hardware, manufacturing techniques, and the implementation of new and novel materials has been
revolutionized. Space exploration pushes the envelope in terms of technological capabilities and
robotic systems (rovers) become lighter, smaller, and more capable of sustaining damage. This
dissertation aids in the advancement of design knowledge for a class of rovers characterized by
their chassis architecture: rigid-flex printed circuit board (PCB) robotics. These rovers leverage
the printed circuit cards as the structural …

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Developing Distributed Real-Time Hybrid Simulation For Dynamic Response Evaluation Of Floating Wind Turbine, Hezha Lutfalla Sadraddin Dec 2022

Developing Distributed Real-Time Hybrid Simulation For Dynamic Response Evaluation Of Floating Wind Turbine, Hezha Lutfalla Sadraddin

Dissertations

Floating wind turbine (FWT) has a significant role in producing clean and sustainable energy in unlimited spaces with more steady wind and less cost. The design, construction, and safe operation of FWTs require a deep understanding of their dynamic responses under combined aerodynamic and hydrodynamic loads. Conventional FWT model experiments utilize wave tanks and wind tunnels. However, laboratory size and capacity and the scaling conflicts between the Froude and the Reynold numbers in these coupled wind-wave loading tests impose challenges to replicate dynamic responses of FWT. Alternatively, real-time hybrid simulation (RTHS), which combines numerical simulation and physical experiment of FWT …

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Development Of An Excel Model To Evaluate The Stability Of Slopes, Bradley Davis Dec 2022

Development Of An Excel Model To Evaluate The Stability Of Slopes, Bradley Davis

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

This objective of this study is to determine a method or tool for taking given slope stability parameters and quickly and effectively determining the factor of safety against sliding of fully softened slopes. This study evaluates the effects of soil and geometric parameters of common slopes, and models these properties in a hypothetical model. The methodology is based on a parametric analysis using the Spencer’s Method of Slices limit equilibrium analysis used in the computer program Slide2. A parametric analysis is performed to determine which soil and/or geometric properties have a high influence on slope stability. The parametric analysis is …

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Schematic Design And Peer Review Of Gayaza Medical Center And Walk-In Clinic, Abigail Coffing, Alexis Buhr Dec 2022

Schematic Design And Peer Review Of Gayaza Medical Center And Walk-In Clinic, Abigail Coffing, Alexis Buhr

Architectural Engineering

This report outlines the structural portion of the work done for the Gayaza Medical Center in Kampala, Uganda. This project was funded by HIINGA, an impact fund doing work in Eastern Africa, who tasked an interdisciplinary group of Cal Poly students with developing a preliminary design for the the medical center. The team consisted of Annebel van der Meulen (architecture), Abigail Coffing and Alexis Buhr (structural), and Arley Landis and Brett Shank (construction management). After completing the initial design, the structural team at Cal Poly rejoined the project the following quarter to do a peer analysis of the finalized structural …

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Scan4façade: Automated As-Is Façade Modeling Of Historic High-Rise Buildings Using Drones And Ai, Yuhan Jiang, Sisi Han, Yong Bai Dec 2022

Scan4façade: Automated As-Is Façade Modeling Of Historic High-Rise Buildings Using Drones And Ai, Yuhan Jiang, Sisi Han, Yong Bai

Civil and Environmental Engineering Faculty Research and Publications

This paper presents an automated as-is façade modeling method for existing and historic high-rise buildings, named Scan4Façade. To begin with, a camera drone with a spiral path is employed to capture building exterior images, and photogrammetry is used to conduct three-dimensional (3D) reconstruction and create mesh models for the scanned building façades. High-resolution façade orthoimages are then generated from mesh models and pixelwise segmented by an artificial intelligence (AI) model named U-net. A combined data augmentation strategy, including random flipping, rotation, resizing, perspective transformation, and color adjustment, is proposed for model training with a limited number of labels. As …

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Evaluating Pedestrian Service Of The New Super Diverging Diamond Interchange On Three Case Study Sites In Denver, Colorado, Muhammad Tahmidul Haq, Amirarsalan Mehrara Molan, Khaled Ksaibati Dec 2022

Evaluating Pedestrian Service Of The New Super Diverging Diamond Interchange On Three Case Study Sites In Denver, Colorado, Muhammad Tahmidul Haq, Amirarsalan Mehrara Molan, Khaled Ksaibati

Faculty and Student Publications

Ensuring safe and comfortable conditions for pedestrians necessitates specific strategies at intersections and service interchanges where traffic and pedestrians interact in complex ways with other modes of transportation. This study aims to investigate pedestrian performance at the new Super Diverging Diamond Interchange (Super DDI) using real-world locations (i.e., I-225 and Mississippi Ave, I-25 and 120th Ave, and I-25 and Hampden Ave in Denver, Colorado). Three alternative designs, typical DDI, and two versions of Super DDI were considered to make a reasonable comparison with the existing Conventional Diamond Interchange (CDI). A comprehensive series of simulation models (192 scenarios with 960 runs) …

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The Bridge Newsletter Winter 2022, Missouri University Of Science And Technology Dec 2022

The Bridge Newsletter Winter 2022, Missouri University Of Science And Technology

The Bridge Newsletter

-Missouri S&T CO2 research is rock solid
-Bringing circular economy to construction projects
-Ph.D. graduate wins Fellowship for solar farm protection research
-Rockne presents 2022 Mathes Lecture on ways to evolve engineering education
-Missouri S&T Ph.D. graduate wins $70,000 Laegeler Fellowship for solar farm protection research

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A Qualitative Multi-Disciplinary Analysis Of Employers’ Technology Competency Perceptions For Graduates Readiness To The Workforce, Marcel Maghiar, Christopher M. Brown Dec 2022

A Qualitative Multi-Disciplinary Analysis Of Employers’ Technology Competency Perceptions For Graduates Readiness To The Workforce, Marcel Maghiar, Christopher M. Brown

Civil Engineering & Construction: Faculty Publications

To fully prepare college graduates to function competently and productively in their career, it is important to examine employers’ views of technology competency and graduates’ readiness. Using a qualitative approach by interviewing employers in South-eastern United States across a range of fields, the authors describe the major functions and dimensions of technology competency, compare similarities and differences across the disciplines, and integrate the results to inform theory and pedagogy. The main purpose of this research is to investigate how well new graduates from selected disciplines can transfer technological skills, how they learned and/or used these skills during their program of …

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Influence Evaluation On Near-Road Concentrations Of Pm2.5 During Covid-19 Pandemic, Marcos Alan Banda Morales Dec 2022

Influence Evaluation On Near-Road Concentrations Of Pm2.5 During Covid-19 Pandemic, Marcos Alan Banda Morales

Open Access Theses & Dissertations

SARS-CoV-2, also known as COVID-19, was discovered in Wuhan, China in late 2019and spread rapidly worldwide in 2020. The COVID-19 pandemic and its quarantine periods influenced the number of people using their vehicles and the number of miles traveled, which correspondingly influenced the air quality of urban areas. The influence of the restrictions caused by the quarantine period on air quality differs from location to location. Previous research accounted for countries, but no research was done at the state level individually. This research attempts to evaluate the transportation-related air quality during the COVID-19 pandemic period using data from the Texas …

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Direct Potable Reuse Piloting: Optimizing Chloramination, Operationalizing Ultrafiltration, And Understanding Zero Liquid Discharge Options, Marcela Carolina Herrera Dec 2022

Direct Potable Reuse Piloting: Optimizing Chloramination, Operationalizing Ultrafiltration, And Understanding Zero Liquid Discharge Options, Marcela Carolina Herrera

Open Access Theses & Dissertations

A pilot study was deployed at the John T. Hickerson Water Reclamation facility to analyze the viability of high recovery direct potable water reuse (DPR), aiming for zero liquid discharge (ZLD). This pilot consists of a chloramination system and ultrafiltration (UF) as pretreatment for reserve osmosis (RO) followed by UV-peroxide, granular activated carbon (GAC), and concentrate-enhanced recovery reverse osmosis (CERRO). Stabilizing the chloramination and UF system was the first step to ensure efficiency during the downstream processes. The formation of monochloramine is essential for the mitigation of biofouling of the UF membranes. The formation of monochloramine occurs by specific liquid …

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A Case Study In Design, Construction, And Operation Of A Meromictic Solar Pond In Texas, Usa, Bianca Paola Meneses Brassea Dec 2022

A Case Study In Design, Construction, And Operation Of A Meromictic Solar Pond In Texas, Usa, Bianca Paola Meneses Brassea

Open Access Theses & Dissertations

Over the last four decades, meromictic solar ponds have been the subject of limnological studies and engineering research. A case of practical interest is the salinity gradient solar pond (SGSP). SGSP science and technologies have been systemically advanced in El Paso, Texas. This dissertation aims to share lessons learned in designing, constructing, and operating the El Paso Solar Pond, a NaCl-based solar pond that achieved high-temperature performance over two decades, commencing in 1984. Many of the practical lessons learned have not been published and are thus not readily available in archival journals, and this contribution provides a remedy. The value …

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Identifying Particulate Matter Spatial Variation In The El Paso Del Norte Region Using Land-Use Regression Modeling And Data Obtained From A Network Of Low-Cost Sensors, Leonardo Demetrio Vazquez-Raygoza Dec 2022

Identifying Particulate Matter Spatial Variation In The El Paso Del Norte Region Using Land-Use Regression Modeling And Data Obtained From A Network Of Low-Cost Sensors, Leonardo Demetrio Vazquez-Raygoza

Open Access Theses & Dissertations

The emergence and rise in popularity of low-cost sensors for atmospheric observation aresetting a new precedent in identifying emission hotspots and providing high-resolution spatial and temporal data. Furthermore, low-cost sensors are becoming popular among institutions and the public, allowing community scientists to become more involved in air quality monitoring. However, concerns about the accuracy and precision of low-cost sensors have been questioned. Most recent research has focused on the utility of real-time monitoring and calibration requirements for these sensors. A low-cost monitoring project has deployed sensors in the El Paso del Norte region in low and high annual average daily …

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Continuous Moisture Measurement During Pavement Foundation Construction: Laboratory Measurements, Isaac Esteban Zuniga Dec 2022

Continuous Moisture Measurement During Pavement Foundation Construction: Laboratory Measurements, Isaac Esteban Zuniga

Open Access Theses & Dissertations

Moisture content directly affects all properties of subgrade materials. A rapid, continuous, and accurate technique to determine moisture content during subgrade construction is the next step needed to improve the mechanistic-based quality of pavement foundations. In this study, six geomaterials were compacted to standard/modified proctor specifications and subjected to laboratory measurements to study the variations in their electromagnetic and electric properties with moisture content. The relationships between the seismic modulus, unconfined compressive strength, lightweight deflectometer, and moisture content for the same geomaterials were also established. Large-scale replicate specimens were also compacted and subjected to numerous measurements. The dielectric constant measured …

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Prague 2023 Summer Program Project Case Study, Jack T. Sampson Dec 2022

Prague 2023 Summer Program Project Case Study, Jack T. Sampson

Construction Management

The Prague 2023 Summer Program is a Construction Management based program that allows students to travel abroad to the Czech Republic and increase their Construction Management knowledge. The eight-week program is hybrid and split between four weeks in Prague followed by four weeks of virtual learning. This program contributes to nine units that include: CM-426 International Construction Studies, CM-463 Senior Project, and CM-450 Integrated Project Design and Program Management. The main purposes of this case study were to (1) find and evaluate a construction project to be used for the Prague 2023 Summer Program and (2) create an assignment schedule …

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The Current State Of Autonomous Construction Robots And The Challenges Of Adoption, Philip Lang Hu Dec 2022

The Current State Of Autonomous Construction Robots And The Challenges Of Adoption, Philip Lang Hu

Construction Management

Autonomous construction robotics is a field of technology that has not traditionally garnered much attention from the mainstream construction industry. The technology has remained relatively under the radar amidst an industry which has yet to experience a fundamental shift in the last several decades. While many industries have found a way to integrate robotics into their everyday functions, the construction industry has yet to standardize the use of robotics on jobsites. Driven by the recent pandemic and subsequent labor shortage, construction robots are now optimally positioned to demonstrate the benefits of flexibility, worker safety, and enhanced productivity and efficiency they …

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The Growing Trends In Prefabricated Commercial Construction In The Bay Area, Conner Edgar Dec 2022

The Growing Trends In Prefabricated Commercial Construction In The Bay Area, Conner Edgar

Construction Management

With the rise in demand for building greener and more efficient buildings, commercial construction companies, in the San Francisco Bay Area, are constantly finding new methods to keep up with new trends. Prefabricated construction has grown exponentially as a building method over the last decade in the commercial construction industry and continues to evolve and become more efficient. Many companies are resorting to prefabricated construction as it decreases time, expenses, and even the amount of waste on construction jobsites. It is important to realize what the future will hold for prefabricated construction while gaining knowledge of the benefits and disadvantages …

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Reality Capture Course Content: Exposing The Next Generation Of Builders To Technology Moving The Industry Forward, Maxwell S. Eisner Dec 2022

Reality Capture Course Content: Exposing The Next Generation Of Builders To Technology Moving The Industry Forward, Maxwell S. Eisner

Construction Management

This paper discusses the development and execution of lecture and laboratory educational content regarding reality capture technology and workflows. These educational modules were created to cover different use cases for reality capture technology that are currently being used in the construction industry. They also show how reality capture plays a role in the larger virtual design in construction (BIM) process. Importantly, these labs were designed to be completed with the LiDAR scanner on a typical iPhone, which has lowered the barrier to entry for reality capture education and use in industry. While the initial teaching of these courses was done …

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Bilingual Advantages To The Construction Industry, Miguel A. Duran Jr. Dec 2022

Bilingual Advantages To The Construction Industry, Miguel A. Duran Jr.

Construction Management

The purpose of this paper is to analyze and emphasize the importance of the Spanish language within the construction industry to construction management students at Cal Poly. Knowledge within another language is also used at an advantage in the industry as it increases one’s value through this key skill, and aids effective team communication on a project. Furthermore, the construction industry is filled with subcontractor’s majority being of Latin-based descent. Though this key skill is not required by companies, this skill can help verbal communication barriers which occur on a project when most subcontractors only speak the Spanish language. Verbal …

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Site Development Feasibility Study, Andy A. Tenekjian Dec 2022

Site Development Feasibility Study, Andy A. Tenekjian

Construction Management

A feasibility study in the world of construction is deemed as a preliminary due diligence process in which key components of a project are addressed to determine if the project is viable or not. These components are related to time and money, and the end goal of a feasibility study is to determine if the initial investment of time and money is worth the amount of future financial return. What deems a project successful in the preliminary stage is up for interpretation. Each developer and investor have their own return on investment threshold in a multi-family project like the one …

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Pull Planning Workshop - Central California Valley, Thomas A. Camargo Dec 2022

Pull Planning Workshop - Central California Valley, Thomas A. Camargo

Construction Management

Lean scheduling and pull planning are both excellent methods of scheduling and sequencing a project. It has made huge impacts on scheduling for general contractors in southern and northern region of California. However, Central California has not been able to see the benefits and impacts of these scheduling tools because of the regions lack of use of lean scheduling and pull planning. Lean scheduling is a technique that encourages communication and collaboration between the project stakeholders. Pull planning offers project stakeholders a chance to rally together and collaborate. These pull planning sessions are useful for sequencing work to meet milestones …

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Construction Management Outreach Event With The Pedrozzi Foundation, Jennifer Padilla Dec 2022

Construction Management Outreach Event With The Pedrozzi Foundation, Jennifer Padilla

Construction Management

The construction industry today continues to be a male-dominated field, often lacking diversity. The lack of diversity and inclusion is attributed to the lack of equitable access to the industry. As a result of continued efforts promoting diversity and inclusion, in August 2022, the construction industry reached an all-time high, with 14% of all construction workers in the U.S. being women. This construction management outreach event, in partnership with the Pedrozzi Foundation, was created to expose young scholars to the topic of construction management. At the event, students and their parents were exposed to the topic of construction management, learning …

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