Investigating The Rapid Curing Possibility Of Geopolymer Concrete,
2019
Louisiana Tech University
Investigating The Rapid Curing Possibility Of Geopolymer Concrete, Ashlesh Banjara
Master's Theses
Recent studies of heat-cured fly ash based green geopolymer concrete have shown its suitability for fabrication of structural members. Fabrication of these structural members requires continuous moderate heating (145°F) for 24 hrs, and an oven essential, for a large member can quickly turn into an energy guzzler, potentially eliminating the green credentials of the product. The proposed research involves the development of a frontal polymerization (FP) method that achieves rapid curing of geopolymer at ambient condition after short-term heat application. Initial work shows thermal FP in geopolymer is a possibility and might be a solution to the problem. The process …
Effects On Strength And Corrosive Characteristics Of Hardened Cement Paste Using Rice Husk And Sugarcane Bagasse,
2019
Louisiana Tech University
Effects On Strength And Corrosive Characteristics Of Hardened Cement Paste Using Rice Husk And Sugarcane Bagasse, Travis D. Garrett
Master's Theses
Cement is one of the most used building materials in the world. The production of ordinary Portland cement contributes to the release of harmful greenhouse gasses. In an effort to reduce these emissions, different materials are being evaluated for their use as partial replacements for ordinary Portland cement. Rice husk and sugarcane bagasse are agricultural waste products and large amounts of these are currently landfilled, making them inexpensive and available. When combusted at high temperatures they form rice husk ash and sugarcane bagasse ash that have pozzolanic characteristics. The high silicon dioxide in these products makes them good options to …
Total Fume Emissions And Emission Factors Applicable To Gas Metal Arc Welding,
2019
LSU New Orleans
Total Fume Emissions And Emission Factors Applicable To Gas Metal Arc Welding, Nayara De Souza
LSU New Orleans Theses and Dissertations
Welding is a common industrial practice that has the potential to emit air pollutants. Emission factors are useful indicators to help in the understanding of the extent of pollution from a process and managing them to reduce or minimize health impacts. The objective of this thesis is to determine emission factors applicable to the gas metal arc welding (GMAW), under varying current and voltage conditions. The most used base metals and an electrode for the shipbuilding industry were considered. A weld fume chamber was used to achieve the project goals along with standard sampling and analytical procedures. Three test runs …
Development Of Traffic Live Load Models For Bridge Superstructure Rating With Rbdo And Best Selection Approach,
2019
Wayne State University
Development Of Traffic Live Load Models For Bridge Superstructure Rating With Rbdo And Best Selection Approach, Sasan Siavashi, Christopher D. Eamon
Civil and Environmental Engineering Faculty Research Publications
Reliability-based design optimization (RBDO) is frequently used to determine optimal structural geometry and material characteristics that can best meet performance goals while considering uncertainties. In this study, the effectiveness of RBDO to develop a rating load model for a set of bridge structures is explored, as well as the use of an alternate Best Selection procedure that requires substantially less computational effort. The specific problem investigated is the development of a vehicular load model for use in bridge rating, where the objective of the optimization is to minimize the variation in reliability index across different girder types and bridge geometries. …
Numerical Modeling Of Wave Dynamics And Sediment Transport Near The Mississippi Birdfoot Delta And Barataria Estuary,
2019
Louisiana State University and Agricultural and Mechanical College
Numerical Modeling Of Wave Dynamics And Sediment Transport Near The Mississippi Birdfoot Delta And Barataria Estuary, Soroush Sorourian
LSU Doctoral Dissertations
The Barataria Basin is a large estuarine system in Southeastern Louisiana, connected to the Gulf of Mexico through a number of inlets, the most important of which is the Barataria Pass. This research examines, during April-June 2010 including both cold front passage and calm summer-time wind regimes, the wave dynamics in this basin and in its major inlets, morphological evolution near the Barataria Pass, and the budgeting and dispersal of the Mississippi River sediment in the birdfoot delta region. An unstructured grid, terrain following, high resolution coupled FVCOM-SWAVE-SED model is employed and validated in this study. The numerical model results …
The Critical Difference Seismic Design Can Make For A Reinforced Concrete Building Located In Oxford, Mississippi,
2019
University of Mississippi
The Critical Difference Seismic Design Can Make For A Reinforced Concrete Building Located In Oxford, Mississippi, Naim Daghmash
Honors Theses
The Senior Design course at the University of Mississippi requires the completion of a capstone project. One part of the capstone project is a complete structural design of the NOLA, an ongoing construction in the city of Oxford in Mississippi. The course requires the NOLA to be designed according to gravity loads, meaning the forces act in the downward direction towards the earth’s surface. Some loading mechanisms that could occur in a different direction than gravity are seismic loads, which are earthquake-generated loads. I was not required by my instructors to consider the effect of an earthquake on the structural …
A Comparative Study Of Insertion Loss Of Traffic Noise Barriers In Georgia,
2019
Kennesaw State University
A Comparative Study Of Insertion Loss Of Traffic Noise Barriers In Georgia, Pablo Giraldo, Jidong Yang
Master of Science in Civil Engineering Theses
In this paper, three types of traffic noise barriers, interlocking steel panels, precast concrete panels, and Paragon panel 23-T, were evaluated in terms of insertion loss. Field test was conducted for the noise barriers recently installed as part of the Northwest Express Project in Georgia. The noise insertion loss was measured as noise difference in A-weighted decibels (dBA) immediately before and after the barriers. The insertion loss was then evaluated by correlating with noise barrier types and other influential variables, including the separation distance of barriers from traffic, the level of traffic, wind speed, and pavement types. The results showed …
2019 05 6 Asce Golden Spike Ces W Eicholtz.Pdf,
2019
Howard University
2019 05 6 Asce Golden Spike Ces W Eicholtz.Pdf, Michael Oconnor
Department of Civil and Environmental Engineering Faculty Publications
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How Moisture Content Levels And Packing Density In Soil Affect Crude Oil Spreads,
2019
University of Mississippi
How Moisture Content Levels And Packing Density In Soil Affect Crude Oil Spreads, Shaylin N. Williams
Venture: The University of Mississippi Undergraduate Research Journal
Crude oil spills are one of the most destructive disasters that can occur, and they are extremely difficult to recover from. Many studies focus on what can be done to clean these crude oil spills, but more research should be focused on means of prevention. Currently, very little is known about how the moisture content levels and the packing efficiency of soil can affect an oil spill. These two factors alone can offer a variety of information to environmental agencies, manufacturers, and refineries. Through utilization of a chemical engineering lab, a recording mechanism, and ImagePro software, data was collected and …
Development Of Daily, Monthly, Inter-Annual, And Mean Annual Hydrological Models Based On A Unified Runoff Generation Framework,
2019
University of Central Florida
Development Of Daily, Monthly, Inter-Annual, And Mean Annual Hydrological Models Based On A Unified Runoff Generation Framework, Marwan Kheimi
Electronic Theses and Dissertations
The main goal of this dissertation develops a unified model structure for runoff generation based on observations from a large number of catchments. Furthermore, obtaining a comprehensive understanding of the physical controlling factors that control daily, monthly, and annual water balance models. Meanwhile, applying the developed Unified model on different climate conditions, and comparing it with different well-known models. The proposed model was compared with a similar timescale model (HyMOD, and abcd) and applied on 92 catchments from MOPEX dataset across the United States. The HyMOD and abcd are a well-known daily and monthly hydrological model used on a variety …
Enhancing Anaerobic Oxidation Of Methane In Landfill Cover Soil,
2019
University of Texas at Arlington
Enhancing Anaerobic Oxidation Of Methane In Landfill Cover Soil, Niloofar Parsaeifard
Civil Engineering Dissertations - Archive
Methane (CH4) is one of the major greenhouse gases (GHG) generated in landfills and has a global warming effect 28 times more than carbon dioxide (CO2). Therefore, decreasing methane emissions into the atmosphere from landfills is critically important. In the upper portions of a landfill cover, methane is exposed to oxygen and oxidized aerobically to carbon dioxide while passing through the cover soil; this lowers the overall contribution of the landfill to climate change. However, because of the low permeability of the landfill cover, no aerobic oxidation occurs in the bottom of the cover because oxygen cannot penetrate to those …
Performance Of Concrete Slabs With Embedded Hydronic Loops For Geothermally Based Bridge De-Icing Applications,
2019
University of Texas at Arlington
Performance Of Concrete Slabs With Embedded Hydronic Loops For Geothermally Based Bridge De-Icing Applications, Mark Hurley
Civil Engineering Theses - Archive
Geothermal energy has always been available as a renewable thermal reserve, however, only recently has it been unlocked as a potential source of energy to de-ice bridges and roadways. The ability to efficiently extract the geothermal reserves has been accomplished with the advent of new technology. Each progressing year, the refinement of technology has led to a reduction in the input required to achieve a desired output. For the case of bridge de-icing, the extracted input of thermal energy must exceed the required demands to permit de-icing. The conventional approach to de-icing (using chemicals, salt, and sand) works as a …
Service Life Prediction And Risk Analysis Of Reinforced Concrete Gravity Flow Pipes Using Reliability Theory,
2019
University of Texas at Arlington
Service Life Prediction And Risk Analysis Of Reinforced Concrete Gravity Flow Pipes Using Reliability Theory, Khaled Saleh Abuhishmeh
Civil Engineering Theses - Archive
Reinforced concrete pipes are susceptible to different types of deteriorations that threaten their structural capacity and serviceability. Failure of these structures or losing parts of their operational capabilities may cause undesirable consequences that affect the surrounding environment, public health and the economy. The main objectives of this research are to estimate the service life, and to evaluate the level of risk of reinforced concrete sewer pipes (RCP) that are under persistent chemical deterioration caused by the sulfide attack that leads to excessive erosion along the pipe’s interior wall. In order to estimate the service life, reliability theory is used by …
Flexural Behavior Of Preflex Sfrc-Encased Steel Joist Composite Beams,
2019
University of Texas at Arlington
Flexural Behavior Of Preflex Sfrc-Encased Steel Joist Composite Beams, Nancy Thazhampallatu Varughese
Civil Engineering Theses - Archive
This research investigates the behavior of encased steel composite beams within steel fiber reinforced concrete (SFRC) in straight and preflex beams, using nonlinear analysis. ABAQUS FEA software has been adopted. Composite steel beams encased in fiber reinforced concrete are analyzed and a comparison is made with available experimental results. Good agreement with the experimental results is observed. Upwards camber of the steel section is introduced on the steel joist. It’s found that the preflex section can increase the ultimate load capacity by 10% and decrease midspan displacement by 13% of the same beams without the preflex steel section. Steel fiber …
Experimental Investigation Of Concrete Breakout Strength Of Anchors In Shear Within Fiber Reinforced Concrete,
2019
University of Texas at Arlington
Experimental Investigation Of Concrete Breakout Strength Of Anchors In Shear Within Fiber Reinforced Concrete, Mohammad Akram Khanfar
Civil Engineering Theses - Archive
This study investigates the effects of Polypropylene fibers on the concrete breakout strength of cast in place anchors in shear under different loading rates. The steel headed anchors were cast within concrete specimens of different amounts of Polypropylene fibers. Four differing mixtures were produced using, 0, 0.5, 1, and 1.5% fibers by volume of the mixture. Their physical properties were calculated through testing at the Civil Engineering Laboratory Building. In total, 16 cylindrical specimens, 4” in diameter and 8” in height, and 6 beam specimens, 6”x6”x20” were produced and tested. After 28 days of curing, the specimens were tested for …
Effect Of Termite Gut Microorganism Tav5 Ratios On Lignin Degradation And Methane Generation From Paper, Yard, And Wood Waste,
2019
University of Texas at Arlington
Effect Of Termite Gut Microorganism Tav5 Ratios On Lignin Degradation And Methane Generation From Paper, Yard, And Wood Waste, Hoda Rahimi
Civil Engineering Dissertations - Archive
Methane from anaerobic processes is being increasingly utilized as an alternative energy source in developed countries, via large projects that extract methane from landfills or wastewater treatment plants. Anaerobic degradation of organic material (biomass) involves decomposition by bacteria under humid conditions without any oxygen. Organic carbon deposited in landfills is converted by microbes to carbon dioxide (CO2) and methane (CH4). If the methane is not captured, it contributes to climate change (28 times more effectively than CO2 on a per-mass basis). If the methane is captured, it can be used as a renewable energy resource. Lignocellulose comprises a significant portion …
Investigation Of Gas- And Liquid-Phase Sewer Environmental Factors Leading To Microbially-Induced Concrete Corrosion,
2019
University of Texas at Arlington
Investigation Of Gas- And Liquid-Phase Sewer Environmental Factors Leading To Microbially-Induced Concrete Corrosion, Aiswarya Acharath Mohanakrishnan
Civil Engineering Theses - Archive
Sewer systems are a principal element of infrastructure in modern cities, accounting for massive amounts of public investments made over many decades and can be considered as an asset of the nation. Many concrete manholes in the sewer system are deteriorating due to the attack of sulfuric acid produced by microorganisms in a process termed as Microbial Induced Concrete Corrosion (MICC). The life span of concrete sewer elements significantly reduces from 100 years to 30–50 years, in extreme cases even down to 10 years. The primary aim of this study is to enhance the understanding of the correlation between gas-phase …
Analysis Of Hydrodynamic And Bathymetric Gradients In Canaveral National Seashore Following Living Shoreline And Oyster Restorations,
2019
University of Central Florida
Analysis Of Hydrodynamic And Bathymetric Gradients In Canaveral National Seashore Following Living Shoreline And Oyster Restorations, David Spiering
Electronic Theses and Dissertations
Coastal vulnerability has been gaining recognition as a critical issue, especially with the increasing predictions of sea level rise. Susceptibility to extreme events, eutrophication, and shoreline modification has left many coastal regions in a degraded state. Shoreline protection has traditionally taken the form of seawalls and offshore breakwaters which can be detrimental to both the local ecosystems and adjoining shorelines. The objective of this thesis is to analyze the hydrodynamic and bathymetric variation that occurs within Mosquito Lagoon, Florida following living shoreline and oyster reef restorations. The shoreline sites were sampled using a Before-After-Control-Impact (BACI) design and data were analyzed …
Use Of Ultra-High-Performance Fiber-Reinforced Concrete (Uhp-Frc) For Fast And Sustainable Repair Of Pavement And A New Sustainable Structural Member With Ultra-High-Performance Fiber-Reinforced Concrete (Uhp-Frc) And Fiber-Reinforced Polymer (Frp) Reinforcement,
2019
University of Texas at Arlington
Use Of Ultra-High-Performance Fiber-Reinforced Concrete (Uhp-Frc) For Fast And Sustainable Repair Of Pavement And A New Sustainable Structural Member With Ultra-High-Performance Fiber-Reinforced Concrete (Uhp-Frc) And Fiber-Reinforced Polymer (Frp) Reinforcement, Ashish Karmacharya
Civil Engineering Theses - Archive
The first part of this research presents a new methodology, which enables streets, roads, highways, bridges, and airfields to use an advanced fiber-reinforced concrete material, which can delay or prevent the deterioration of these transportation infrastructure when subjected to traffic and environmental loadings. The major problem of concrete is its considerable deterioration and limited service life due to its brittleness and limited durability. As a result, it requires frequent repair and eventual replacement, which consumes more natural resources. Ultra-high-performance fiber-reinforced concrete (UHP-FRC) introduces significant enhancement in the sustainability of concrete structures due to its dense microstructure and damage-tolerance characteristics. These …
Identification Of Legal And Policy Barriers To Timely Post-Disaster Reconstruction And Strategy Development For Effective Recovery Processes In United States,
2019
University of Texas at Arlington
Identification Of Legal And Policy Barriers To Timely Post-Disaster Reconstruction And Strategy Development For Effective Recovery Processes In United States, Vaibhav Dhamangaonkar
Civil Engineering Theses - Archive
Communities resilient to disasters have the ability to return to the normal state quickly and with the least possible delay; however, the causes of delays in the post-disaster recovery phase remain an important concern. Yet, different scholars have studied the long-term post disaster recovery process, barriers in the long-term disaster reconstruction have been studied rarely. This study fills the major gap in the research by identifying barriers in post disaster reconstruction and best practice to increase the speed of the recovery. In this regard, an in-depth review of more than one-hundred scholarly papers in this area was performed, policies and …
