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Articles 61 - 90 of 331
Full-Text Articles in Civil and Environmental Engineering
Physical Characterization And Evaluation Of Energy Potential For Mined Waste From Irving Landfill, Vijay Kakara
Physical Characterization And Evaluation Of Energy Potential For Mined Waste From Irving Landfill, Vijay Kakara
Civil Engineering Theses - Archive
Historically landfills have been seen as the ultimate solution for storing waste at minimum cost. But, now it is a well-known fact that these deposits have numerous implications such as long term methane emissions, local pollution and many space-related issues etc. In most parts of the world, however, landfilling is the most common method to dispose waste. Even developed countries with recycling and waste treatment facilities have been no exception in landfilling. Therefore over the years, several old and operating landfills have been accumulated with an enormous amount of obsolete materials and products. To address such issues related to waste …
Driveability Of Recycled Plastic Pin (Rpp) In North Texas, Arif Mohammad Aziz
Driveability Of Recycled Plastic Pin (Rpp) In North Texas, Arif Mohammad Aziz
Civil Engineering Theses - Archive
The Recycled Plastic Pins (RPP) have been extensively used as an alternative to the conventional slope stabilization methods in stabilizing shallows slope failure in Texas, Missouri, Kansas, and Idaho in the United States. The RPP provides additional resistance along the potential slip surface when it is driven into the slope and increases the factor of safety. RPPs are fabricated from recycled plastics and waste materials (i.e. polymers, sawdust, and fly ash), and is nondegradable in nature. It is found to be very useful and beneficial engineering materials for civil engineering infrastructure projects. The cost-effectiveness of using any engineering material largely …
Effect Of Chicken Manure On Methane Production From Msw In Lab Scale Anaerobic Reactors, Md Tauhidul Islam
Effect Of Chicken Manure On Methane Production From Msw In Lab Scale Anaerobic Reactors, Md Tauhidul Islam
Civil Engineering Theses - Archive
One of the major problems of urbanization is the production of a huge amount of Municipal Solid Waste. The cities and metropolitan areas are generating more and more solid waste and these wastes are filling up the landfill rapidly. Creating new landfills after a few years is not a solution as there is not much space in urban areas. Moreover, making the landfills far away from cities is not economically viable as longer hauling distance increases the cost. In this scenario, Bioreactor landfill is a viable solution to this problem. Bioreactor landfills can save a lot of space and it …
Laboratory Testing And Finite Element Modeling Of Invert Removed Corrugated Metal Culvert Buried Under Shallow Cover, Hiramani Raj Chimauriya
Laboratory Testing And Finite Element Modeling Of Invert Removed Corrugated Metal Culvert Buried Under Shallow Cover, Hiramani Raj Chimauriya
Civil Engineering Theses - Archive
Ever since their advent in the 1800s, corrugated metal pipes (CMPs) have played a vital role in this nation’s infrastructure. The wide range of options on diameter and span have made these culverts more preferable over traditional concrete culverts. However, compared to concrete culverts, CMPs have a shorter design life and are only expected to last 10 to 30 years even under ideal conditions. Over the course of years, different open-cut and trenchless methods have been used to rehabilitate existing old and damaged culverts. In recent years, trenchless methods like sliplining, CIPP, spray-applied pipe linings, etc. have been gaining popularity …
Remaining Service Life Estimation And Probabilistic Analysis Of Reinforced Concrete Sewer Pipeline Systems, Pardis Moamaei
Remaining Service Life Estimation And Probabilistic Analysis Of Reinforced Concrete Sewer Pipeline Systems, Pardis Moamaei
Civil Engineering Theses - Archive
The serviceability and structural performance of reinforced concrete pipes could deteriorate for many reasons. The loss in structural capacity and other structural operations may drastically affect the surrounding environment, public health and the economy. This research is directed towards the estimation of remaining service life, and to evaluate the level of risk of failure of reinforced concrete sewer pipes (RCSP) that are subjected to continuing corrosion due to sulfide attack that in turn leads to loss of pipe thickness caused by excessive deterioration along the pipe’s interior wall. In order to estimate the remaining service life, reliability theory is used …
Analytical And Numerical Modeling Of Externally Heated Geothermal Bridge Deck, Mandakini Chowdhury
Analytical And Numerical Modeling Of Externally Heated Geothermal Bridge Deck, Mandakini Chowdhury
Civil Engineering Theses - Archive
Bridge icing is a severe safety concern for travel during winter months in the United States. Ice on bridges form quicker than roads, as the bridge is exposed to wind on all its surfaces. The underlying problem of bridge icing is loss of friction between the vehicle wheel and the pavement surface due to slippery nature of ice. Hence, the solution is to increase the friction between the above-mentioned surfaces. The most commonly adopted solution is application of sand, salt or other granular materials on the roadway. However, due to corrosive nature of the salts, the durability of the infrastructure …
User Syndication Using Speech Rhythm, Faisal Z H Alnahhas
User Syndication Using Speech Rhythm, Faisal Z H Alnahhas
Civil Engineering Theses - Archive
In recent years we have seen a variety of approaches to increase security on computers and mobile devices including fingerprint, and facial recognition. Such techniques while effective are very expensive. Voice biometrics, specifically speech rhythm, is a method that has been drawing attention and growing in recent years. Unlike other methods, it requires little to no additional hardware installed on a device for it to work accurately. Speech rhythm utilizes the device's built-in microphone, and analyzes speakers based on features of their speech. In this work we leverage the existing hardware and simply add an efficient layer of software to …
Performance Of Concrete Slabs With Embedded Hydronic Loops For Geothermally Based Bridge De-Icing Applications, Mark Hurley
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, Khaled Saleh Abuhishmeh
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, Nancy Thazhampallatu Varughese
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, Mohammad Akram Khanfar
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 …
Investigation Of Gas- And Liquid-Phase Sewer Environmental Factors Leading To Microbially-Induced Concrete Corrosion, Aiswarya Acharath Mohanakrishnan
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 …
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, Vaibhav Dhamangaonkar
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 …
Experimental Investigation Of Concrete Breakout Strength Of Anchor In Tension Within Fiber Reinforced Concrete, Karthik Vidyaranya
Experimental Investigation Of Concrete Breakout Strength Of Anchor In Tension Within Fiber Reinforced Concrete, Karthik Vidyaranya
Civil Engineering Theses - Archive
This research investigates the effects of steel fibers on the concrete breakout of the cast-in-place headed stud anchors in tension. High strength anchors (F1554 G105) is used in this study for varying steel fiber dosage of 0.0%, 0.5% and 1.0% by volume fraction of concrete. The physical properties of steel fiber reinforced concrete were calculated through various test at the Civil Engineering laboratory Building. In total, 9-cylinder specimens of 4” diameter and 8” height, and 9 beam specimens, 6”x6”x20” were made and tested. After 28 days of curing, the specimens were tested for their compressive strength and modulus of rupture, …
Identification Of The Manageable Construction Rework Indicators And Related Successful Strategies, Piyush Taneja
Identification Of The Manageable Construction Rework Indicators And Related Successful Strategies, Piyush Taneja
Civil Engineering Theses - Archive
In construction projects whether small or large scale, in the design and construction phases, contractors and owners face numerous reworks which finally leads to schedule delays and cost overruns. Although studying the causes of the rework has been of interest of many scholars and researchers, they have mainly focused on identifying the entity-based rework indicators. It is pivotal to identify the key project, organizational, and human factors that lead to the rework. Therefore, this study investigated, identified, and prioritized the human, organization, and project-based manageable indicators of rework. In addition, successful strategies which lead to overcoming rework challenges were evaluated. …
Long Term Performance Monitoring Of Shallow Slope Stabilization Utilizing Recycled Plastic Pins, Cory Alan Rauss
Long Term Performance Monitoring Of Shallow Slope Stabilization Utilizing Recycled Plastic Pins, Cory Alan Rauss
Civil Engineering Theses - Archive
Shallow slope failures are prevalent within the North Texas region. As highway slopes are underlain with high plastic clayey soils that experience cyclic shrinking and swelling, the soils shear strength generally decreases as the soil softens, making the soil more susceptible to sloughing and landslides. The Texas Department of Transportation (TxDOT) generally executes a rapid repair method as an economical option for repairing the slope. This method includes the failed soil removal, replacement, and recompaction to rectify the slope surface. While economical initially, this rapid repair technique may potentially prove to be costly with repeated repairs as the method does …
Evaluation Of Best Practices For Implementation Of Slope Repair Methods In Texas, Milad Nabaei
Evaluation Of Best Practices For Implementation Of Slope Repair Methods In Texas, Milad Nabaei
Civil Engineering Theses - Archive
Embankment slope failures occur frequently in areas with extreme weather (frequent wetting and drying periods) and unstable soil conditions (high swelling potential clay) such as state of Texas. Despite all progresses in the geotechnical knowledge and the advancement of slope repair methods, still, many repaired slopes fail again after a period of time. The primary objectives of this study are to (1) Review and evaluate existing repair methods for shallow slope failures from the construction perspective, and (2) Recommend appropriate implementation procedures for successful implementation of slope repair methods. The research approach which has been followed to achieve the project …
Laboratory And Field Study Of A Liquid Ionic Soil Stabilizer, Sandesh Gautam
Laboratory And Field Study Of A Liquid Ionic Soil Stabilizer, Sandesh Gautam
Civil Engineering Theses - Archive
Chemical stabilization of expansive soil has been practiced for quite a time now. The use of lime/cement stabilization as a traditional method has been well acknowledged, understood and standard guidelines for practice have been developed. However, owing to certain demerits like high production and application cost, environmental impact, durability issues and most importantly incompatibility with high-sulfate soil leading to excessive heaving and swell, there is need to develop alternatives to these stabilizers. Non-traditional stabilizers like ionic soil stabilizer have been used by manufacturers in the past and claimed to effectively reduce the swell-shrink behavior of expansive soil. Undocumented results, the …
Structural Safety Of Bridge Decks With Variable Rebar Cover, Prem Egade
Structural Safety Of Bridge Decks With Variable Rebar Cover, Prem Egade
Civil Engineering Theses - Archive
Construction defects are common and are difficult to avoid completely. This arises due to improper workmanship, inspection, drawing and specification. On bridge decks, achieving the desired cover is necessary since inadequacy can cause accelerated corrosion in steel and for the most part spalling and delamination which ultimately led to failure. Tolerance provided by different standards and specification also restrict the amount of rebar. So, construction is more focused on increasing cover undermining the loss of strength as consequence. The objective of this research is to check the safety of decks by analyzing bridges for reduction in capacity due to cover …
Field Swcc Modeling And Soil Water Storage Evaluation Through Geophysical Testing, Linkan Sarker
Field Swcc Modeling And Soil Water Storage Evaluation Through Geophysical Testing, Linkan Sarker
Civil Engineering Theses - Archive
Evapotranspiration (ET) landfill cover is an emerging final cover system and offers several benefits over conventional landfill closure system. It is a cost-effective green solution for the sustainability of a landfill as its performance enhances with time compared to the conventional solution where low hydraulic conductivity soil barrier deteriorates with time. ET cover system relies on the water store-release principle and its performance depends on the site-specific factors such as on-site climatological conditions, soil hydraulic properties and native vegetation. To effectively monitor the performance of this type of cover system, its unsaturated behavior, field capacity, available moisture for plant growth, …
A Calibration Chamber For Thermo-Hydro-Mechanical Studies Of Soil Behavior Via Resonant Column Testing, Daniel R. C. Green
A Calibration Chamber For Thermo-Hydro-Mechanical Studies Of Soil Behavior Via Resonant Column Testing, Daniel R. C. Green
Civil Engineering Theses - Archive
Abstract A Calibration Chamber for Thermo-hydro-mechanical Studies of Soil Behavior via Resonant Column Testing Daniel R. C. Green The University of Texas at Arlington, 2018 Supervising Professor: Dr. Laureano Hoyos A considerable portion of the emerging geothermal infrastructure in the country is located in earthquake prone areas while being supported and/or surrounded by soil deposits located well above the groundwater table. Geotechnical earthquake research in the country, however, continues to be mostly focused on soil response under saturated conditions, especially soil liquefaction phenomena, while most of the work on dynamic response of compacted soils has not taken suction or thermal …
An Investigation Of Water Pipeline Renewal Practices, Abbas Abed Salman
An Investigation Of Water Pipeline Renewal Practices, Abbas Abed Salman
Civil Engineering Theses - Archive
Globally, the use of trenchless technologies is gradually increasing due to the growing need to replace and renew aging utility infrastructure and the need for more flexible solutions for the installation of new pipes. In the United States of America, the American Society of Civil Engineers (ASCE) in 2017 assessed that America’s infrastructure is close to failing. It faces an annual shortfall of at least $11 billion to replace the aging facilities that are near the end of their useful lives. In this research, surveys and interviews of professionals working in trenchless technologies for the North American Society for Trenchless …
Determination Of Root Length Of Evapotranspiration Cover Using Electrical Resistivity Imaging Technique, Fouzia Hossain Oyshi
Determination Of Root Length Of Evapotranspiration Cover Using Electrical Resistivity Imaging Technique, Fouzia Hossain Oyshi
Civil Engineering Theses - Archive
Evapotranspiration (ET) covers are receiving an increasing amount of attention for use at waste disposal sites. Instead of using barrier layers like conventional covers, percolation in ET cover system is minimized by water balance components which store the water prior to its transpiration through vegetation or evaporation from the soil surface. Vegetation for an ET cover must be suitable for its particular locality and have well-developed root systems, since they promote transpiration and contribute to the long-term performance of the cover. They pull water out of the cover soil and release it into the environment, thereby decreasing the percolation of …
Concrete Breakout Strength Of Post-Installed Anchors Within Fiber Reinforced Concrete, Travis Michael Pechacek
Concrete Breakout Strength Of Post-Installed Anchors Within Fiber Reinforced Concrete, Travis Michael Pechacek
Civil Engineering Theses - Archive
This study investigates the effects of Polypropylene fibers on the concrete breakout of post-installed screw anchor bolts. Concrete anchors were installed within concrete specimens of differing 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 (CELB). 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 their compressive and tensile strengths, as well as …
Evaluation Of The Seasonal Variation In Hydraulic Conductivity For An Evapotranspiration Cover System, Lucas Hoyos Cadavid
Evaluation Of The Seasonal Variation In Hydraulic Conductivity For An Evapotranspiration Cover System, Lucas Hoyos Cadavid
Civil Engineering Theses - Archive
The purpose of landfill cover systems is to minimize, and if possible prevent the interaction of the environment with the buried waste mass. In this effort, one of the most prevalent parameters to control is the percolation of rainfall through the cover system into the waste mass. In addition to this, if the cover system utilizes an evapotranspiration or water balance cover, understanding this parameter becomes especially important. This type of system relies on the ability of the soil to retain moisture and the natural process through which vegetation transports water from its roots to the atmosphere. Consequently, the percolation …
Impacts Of Geotechnical Aspects In Tunneling Design And Construction, Mohammad Haadi Sadaghiani
Impacts Of Geotechnical Aspects In Tunneling Design And Construction, Mohammad Haadi Sadaghiani
Civil Engineering Theses - Archive
In tunneling project, different type of methods is conducted to do the project. Knowing geotechnical aspects of tunnel project is unavoidable and crucial in early stage of project especially before contract to have efficient and more accurate design and prevent cost overruns, reduce bid price and reduce project risks. However, all that geotechnical information should be based on standard guidelines such as Geotechnical Baseline Report (GBR) to help owner how to provide those geotechnical data in bid contract and use it as a guideline in contract to prevent future claim or disputes. The main objective of this thesis is about …
Effect Of Fine Grained Soil In The Strength Of Cement Treated Flex-Base Materials, Sita Timsina
Effect Of Fine Grained Soil In The Strength Of Cement Treated Flex-Base Materials, Sita Timsina
Civil Engineering Theses - Archive
The recycled materials such as, Recycled Crushed Concrete Aggregates (RCCA) and Reclaimed Asphalt Pavement (RAP) treated with cement has been widely used as the alternative granular base in pavement construction in different states in USA due to the depletion of natural resources of virgin aggregates. While a number of factors drive the use of these recycled materials, the two primary factors are economic savings and environmental benefits. In the flexible pavement systems, the base layer contributes to the structural capacity of the pavement systems, so, the quality performance of this layer is essential. However, presence of fine particles in the …
Diagnosis And Quantification Of Post-Disaster Construction Material Cost Fluctuations, Niloufar Khodahemmati
Diagnosis And Quantification Of Post-Disaster Construction Material Cost Fluctuations, Niloufar Khodahemmati
Civil Engineering Theses - Archive
The post-disaster survival of cities and communities depend on their capabilities to rapidly reconstruct damages. Temporary increase in construction costs following natural disasters, also known as “demand surge,” impedes the rapid post-disaster reconstruction process. The existing methods for quantifying the post-disaster construction cost escalations do not consider seasonal patterns and inflation of costs under normal condition. Therefore, it is not clear whether the quantified construction cost increases are due to a disaster or merely associated with seasonal patterns and inflation. The objective of this study is to (1) create an approach to statistically quantify the post-disaster construction material cost fluctuations …
Evaluation Of Beams And Columns Strengthening With Pre-Saturated And Regular Cfrp, Preeti Pandey
Evaluation Of Beams And Columns Strengthening With Pre-Saturated And Regular Cfrp, Preeti Pandey
Civil Engineering Theses - Archive
Structural members such as columns and beams are often subjected to reduced capacity due to errors in design or construction or often due to deterioration with time. The effect of reduction in capacity due to environmental and loading conditions are often the causes for deterioration or complete failure of structures. The main objective of this study is to deliver the effect of using Pre-Saturated Carbon Fiber Reinforced Polymer (CFRP) over regular CFRP Laminates, as an external strengthening material for strength and confinement of these deteriorated structures. The hypothesis was the use of Pre-Saturated CFRP over conventional regular CFRP Wet layup …