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Articles 151 - 180 of 699
Full-Text Articles in Civil and Environmental Engineering
Optimization Of Concrete Pavement Design To Truck Platoon Loading, Mohsen Talebsafa
Optimization Of Concrete Pavement Design To Truck Platoon Loading, Mohsen Talebsafa
Civil Engineering Dissertations - Archive
Transportation is the major contributor toward economic growth and development. In the United States, more than 90% of commodities are transported through the roadway system. Due to the high demand for transportation of goods, there is a high demand in the road freight industry for innovative solutions, and new technologies to improve the sustainability and efficiency of transportation. Truck platooning is one of the most recent technologies with great potential to make road freight safer, cleaner, and more efficient. This technology uses connectivity technologies and automated driving systems to interconnect two or more trucks in a convoy. These automation technologies …
Evaluation Of Surface Asphalt Mixes Containing Recycled Asphalt Materials In North-East Texas Using Accelerated Pavement Testing, Ana Maria Coca
Evaluation Of Surface Asphalt Mixes Containing Recycled Asphalt Materials In North-East Texas Using Accelerated Pavement Testing, Ana Maria Coca
Civil Engineering Dissertations - Archive
Reclaimed asphalt pavement (RAP) and Reclaimed Asphalt Shingles (RAS) has proved to be an effective alternative to virgin materials in HMA production. Despite that recycling asphalt creates a cycle that optimizes the use of natural resources and sustains the pavement industry, State transportation departments have limited the maximum amount of RAP used in surface layers because of the variability concerns and lack of guidance provided. Even though at the moment, the United Stated recycles more RAP than Europe does in terms of percentage of the total RAP extracted from old pavements, it still lags Japan and other countries. A special …
Reuse Of Recycled Plastic For Plastic Road Design, Tahsina Islam
Reuse Of Recycled Plastic For Plastic Road Design, Tahsina Islam
Civil Engineering Dissertations - Archive
The ever-increasing volume of traffic and the volatility of daily and seasonal temperatures that are being experienced globally make it essential that the quality and durability of roads are improved. Modifiers can improve the engineering properties of the asphalt mix in these situations. Perhaps plastics are the most promising of all types of modifiers. Since the disposal of plastic waste is a major concern for the environment, recycling of these waste materials is highly desired. The recycling and reuse of plastic waste is a prime example of sustainable waste management. It reduces the buildup of waste in landfills, thereby reducing …
Utilizing Load Tests And Site Investigation Data To Predict Design Load Capacities For Drilled Shafts In Different Geologic Formations, Hosam Salman
Civil Engineering Dissertations - Archive
Precise predictions of the design capacities of drilled shafts on weak rock formations is vital for a better design of foundations. Irregularities in rock formations due to weathering cause discrepancies in actual bearing capacities and evaluating the bearing capacity typically requires frequent in-situ testing, using load test shafts at smaller intervals, which is time consuming and expensive. The typical design in Texas currently utilizes in-situ design charts that are developed based on Texas Cone Penetrometer (TCP) blow counts. This approach is found to have limitations related to maximum number of blows, rock characterization, and difficulty in incorporating influential parameters. Problematic …
Environmental And Health Implications Of Mine Tailing-Based Construction Materials In Developing Communities: Current Practices And Ways Forward, Jose Raul Velasquez Vasquez
Environmental And Health Implications Of Mine Tailing-Based Construction Materials In Developing Communities: Current Practices And Ways Forward, Jose Raul Velasquez Vasquez
Civil Engineering Theses - Archive
For many years, artisanal and small-scale mining (ASM) communities around the world have been developing strategies to reduce contaminated mine tailings produced by mineral processing operations. These mine tailings are the by-product of the physical and chemical processes required to extract metals that humans require every day. The strategies developed by these communities cover a wide range of solutions, such as better practices in mineral processing activities as well as alternative technologies that help reduce the environmental impact of mining. Specifically, the recycling of mine tailings to produce construction materials has been of interest to researchers and communities. The use …
A New Geothermal Bridge De-Icing System With Attached Hydronic Heating Loops: Field Tests, Numerical Modeling, And Economic Assessment, Omid Habibzadeh Bigdarvish
A New Geothermal Bridge De-Icing System With Attached Hydronic Heating Loops: Field Tests, Numerical Modeling, And Economic Assessment, Omid Habibzadeh Bigdarvish
Civil Engineering Dissertations - Archive
Each year, ice and snow adversely impact U.S. transportation infrastructure during the cold season, causing an extensive impact on the U.S. economy. Bridges are key elements in the transportation network and the most vulnerable sections of the road to ice and snow. Conventional snow and ice removal system (CSRS) is proven not to be a satisfactory solution as it causes induced damages and issues, such as accelerating bridge deck corrosion, safety issues, travel delays, and environmental damages. Thus, the geothermal heat pump de-icing system (GHDS) is introduced as a sustainable solution for bridge deck de-icing, which utilizes renewable geothermal energy …
Further Development Of Ultra-High-Performance Fiber Reinforced Concrete (Uhp-Frc): 3d Printing, Sifcon, Alternative Fibers, Shrinkage Crack Control, High Temperature, And Lightweight, Bhupendra Raj Acharya
Further Development Of Ultra-High-Performance Fiber Reinforced Concrete (Uhp-Frc): 3d Printing, Sifcon, Alternative Fibers, Shrinkage Crack Control, High Temperature, And Lightweight, Bhupendra Raj Acharya
Civil Engineering Theses - Archive
Introduction of artificial intelligence (AI) and machine learning in manufacturing industry also in every service industry, decreasing conventional skilled workforce and stagnated construction industry, probability and past statistics of the accident at the construction sites and difficulty in quality control has led the researchers to think of the solution and alternatives of the conventional construction. A new construction paradigm, known as 3-D concrete printing or additive manufacturing of concrete (AMC) provides such a solution. This research focuses on a preliminary study in 3d printed ultra-high-performance fiber-reinforced concrete (UHP-FRC) and, has developed a novel mix that has balanced extrude-ability and buildability. …
Reusing Of Recycled Plastic As Pavement Base And Sub-Base Materials, Tanvir Imtiaz
Reusing Of Recycled Plastic As Pavement Base And Sub-Base Materials, Tanvir Imtiaz
Civil Engineering Dissertations - Archive
A large percentage of waste materials is recycled back into the same product from which they originated. In spite of considerable progress in recycling waste materials generated in urban environments, the materials are sometimes not able to be recycled into the same product due to their quality or technical requirements and are as a result dumped or incinerated. Recycling concrete aggregate (RCCA) and recycled waste plastics are examples of recycled materials that can be used as an alternative to natural aggregates during the construction of newer structures as well as demolition of existing structures like buildings, bridges, and pavements. Materials …
Causes Of Driver Distraction And Incidents At Signalized Intersections, Zannatulferdous Labony
Causes Of Driver Distraction And Incidents At Signalized Intersections, Zannatulferdous Labony
Civil Engineering Dissertations - Archive
Driver distraction causes a major portion of motor vehicle crashes because distractions turn the driver’s attention away from driving the driving task, Intersections represent high risk environments because many conflict points within the intersection exist. At intersections with signalized traffic control, drivers may be more likely to become distracted than at other intersections. While distraction during the red indication may not seem to be a significant concern, this study investigates the role distraction plays in crashes at signalized intersections. Using the SHRP2 naturalistic driving study data, this study focuses on investigating the frequency and types of driver distraction, the causes …
Development Of Non-Prestressed Uhp-Frc Girders For Long-Span Bridges With Dcsr Design Concept And Collapse Assessment Of Smfs With Calibrated Rc And Uhp-Frc Columns Based On Full-Scale Experiments, Seyed Missagh Shamshiri Guilvayi
Development Of Non-Prestressed Uhp-Frc Girders For Long-Span Bridges With Dcsr Design Concept And Collapse Assessment Of Smfs With Calibrated Rc And Uhp-Frc Columns Based On Full-Scale Experiments, Seyed Missagh Shamshiri Guilvayi
Civil Engineering Dissertations - Archive
The work presented here is divided in two parts. This summary includes two paragraphs, each summarizing the topics presented in this dissertation. Ultra-high-performance fiber-reinforced concrete (UHP-FRC) is an emerging material and revolutionarily utilize its mechanical properties can offer a new way to design conventional precast prestressed concrete girders. Its ultra-high compressive strength (> 20 ksi) accompanying by exceptional compressive ductility with a maximum useable compressive strain of 0.015–0.03 allow designers to use higher amount of reinforcement. Current design codes (ACI 318 Building Code and AASHTO LRFD Bridge Design Specifications), limits the maximum useable compressive strain, εcu, to 0.003 for conventional …
Development Of A Model To Prioritize Inspection And Condition Assessment Of Gravity Sanitary Sewer Systems, Karthikeyan Loganathan
Development Of A Model To Prioritize Inspection And Condition Assessment Of Gravity Sanitary Sewer Systems, Karthikeyan Loganathan
Civil Engineering Dissertations - Archive
Underground utilities and wastewater collection systems deteriorate over time demanding utility owners to involve in continuous revisions and development of their asset management frameworks to maintain the functionality of their assets. In any asset management framework, inspection of an asset and respective condition assessment plays a vital role in successful operation and maintenance of systems. In the United States, closed-circuit television (CCTV) is the commonly used device for inspecting the inner environment of sewer pipes, which considering the large length of pipe inventory in a city, is a relatively expensive and time-consuming process. Therefore, inspection of every individual sanitary sewer …
Structural Performance Of Distressed Cast-In-Place Concrete Bridge Retaining Wall, Karzan Ms Habeeb
Structural Performance Of Distressed Cast-In-Place Concrete Bridge Retaining Wall, Karzan Ms Habeeb
Civil Engineering Dissertations - Archive
Cast-In-Place (CIP) concrete retaining walls have been used in the United States widely in the 20th century. CIP concrete walls have additionally proven to be structurally rigid and cost-effective for low backfill height. This type of wall is also sustainable with design service life of 75 years (TxDOT 2014). However, during service, the wall undergoes distressed movements, structural deficiency, and stability related problems. CIP cantilever concrete retaining walls often do not perform as expected, and the walls are affected by construction and/or structural deficiency, which sometimes leads to failure. The current study was inspired by distressed CIP walls located on …
Modeling Of Hydrogen Sulfide Generation And Rates Of Microbial Induced Concrete Corrosion In Manhole Shafts, Sunakshi Hada
Modeling Of Hydrogen Sulfide Generation And Rates Of Microbial Induced Concrete Corrosion In Manhole Shafts, Sunakshi Hada
Civil Engineering Dissertations - Archive
Manhole shafts can undergo infrastructure failure due to microbially induced concrete corrosion (MICC). Deterioration of the sewer systems by MICC process occurs due to the volatilization of hydrogen sulfide into the gas phase. The volatized hydrogen sulfide gas reacts with oxygen to form sulfuric acid, resulting in concrete corrosion. If optimum conditions are present, 24 mm of concrete loss can occur in 31 months, and the cost of fixing can range from $10-$30 per square foot. Also, if the manholes are not properly maintained, they can cause serious safety hazards, such as manhole lids falling through the structure, streets giving …
Effectiveness Of Recycled Plastic Pin For Improving Bearing Capacity Of Embankment Over Soft Soil, Md Azijul Islam
Effectiveness Of Recycled Plastic Pin For Improving Bearing Capacity Of Embankment Over Soft Soil, Md Azijul Islam
Civil Engineering Dissertations - Archive
Construction of embankment over soft foundation soils is incredibly a challenging task due to the risk of bearing failure and excessive settlement of foundation soil. Most of the available conventional methods for addressing these problems are either expensive or time-consuming or both. Therefore, research has been striving to develop a sustainable alternative to the current conventional methods. A noble approach to improve the soft foundation soil could be the use of Recycled Plastic Pins (RPP) in combination with geosynthetics. The load transfer efficiency of a geosynthetic-reinforced and RPP supported embankment is influenced by interactions among embankment fill, geosynthetics, and foundation …
Development And Comparison Of Prediction Models For Sanitary Sewer Pipes Condition Assessment Using Multinomial Logistic Regression And Artificial Neural Network., Daniel Ogaro Atambo
Development And Comparison Of Prediction Models For Sanitary Sewer Pipes Condition Assessment Using Multinomial Logistic Regression And Artificial Neural Network., Daniel Ogaro Atambo
Civil Engineering Dissertations - Archive
Sanitary sewer pipes infrastructure system in good condition is essential in providing safe conveyance of the wastewater from homes, businesses, and industries to the wastewater treatment plants. For sanitary sewer pipes to deliver the wastewater to the treatment plants, they must be in good condition. Most of the water utilities have aged sanitary sewer pipes. Water utilities inspect sewer pipes to decide which segments of the sanitary sewer pipes need rehabilitation or replacement. The process of inspecting the sewer pipes is described as condition assessment. This condition assessment process is costly and necessitates developing a model that predicts the condition …
Performance Of Recycled Plastic Pins For Increasing Bearing Capacity Of Foundation Soil, Faria Fahim Badhon
Performance Of Recycled Plastic Pins For Increasing Bearing Capacity Of Foundation Soil, Faria Fahim Badhon
Civil Engineering Dissertations - Archive
Mechanically Stabilized Earth (MSE) walls constructed on unsuitable foundation soil are prone to large deformation and bearing capacity failure. A variety of techniques can be applied to address this issue, such as removal and replacement of existing soil with competent soil, staged construction, dynamic compaction, stone columns, geosynthetic reinforcement. One common traditional approach followed by Texas Department of Transportation (TxDOT) for the improvement of unsuitable foundation soil is removal of the in-situ soil and replacement with suitable fill material. However, this method can be time-consuming and expensive. A pile-supported system in combination with geosynthetic reinforcement can provide a sustainable solution …
Modeling Capacity: Multiple Weaving Areas, Sheida Khademi
Modeling Capacity: Multiple Weaving Areas, Sheida Khademi
Civil Engineering Dissertations - Archive
Systematic, well-designed research provides the most effective approach to the solution of many problems facing highway administrators and engineers. Traffic congestion on freeway systems is one significant concern in urban areas throughout the U.S.A. In this era, building new freeways to reduce congestion is less feasible due to the high capital and social costs. Thus, the effective management and operation of existing freeway facilities has become a preferred approach to reduce traffic congestion. A weaving section is a common design on major highway facilities that always has been an interest to researchers. Weaving areas are characterized by frequent lane changes, …
Mechanical Response Of Chemically Treated Sulfate-Rich Clay Under Multiple Triaxial Stress Path, Azadeh Asghariastaneh
Mechanical Response Of Chemically Treated Sulfate-Rich Clay Under Multiple Triaxial Stress Path, Azadeh Asghariastaneh
Civil Engineering Dissertations - Archive
Expansive clayey soils, which are abundant in arid and semi-arid areas, including the state of Texas, can lead to excessive distress in pavements, foundations, embankments, earth retaining systems and other civil infrastructure that is either made of or supported by this type of soils. Calcium-based stabilizers, such as lime, cement and fly ash, have become popular soil stabilizers due to their ready availability and relatively low cost; however, myriad cases of failures of pavements and foundation built over sulfate-rich treated clay have led researchers to search for more efficient substitutes for calcium-based stabilizers. A very limited number of studies, however, …
Photocatalytic And Photochemical Decomposition Of Various Per- And Polyfluoroalkyl Substances (Pfas) In Water, Nusrat Chowdhury
Photocatalytic And Photochemical Decomposition Of Various Per- And Polyfluoroalkyl Substances (Pfas) In Water, Nusrat Chowdhury
Civil Engineering Dissertations - Archive
Per- and polyfluoroalkyl substances (PFAS) are anthropogenic compounds comprised of a perfluoroalkyl backbone and a terminal functional group. Their detrimental health effects of in humans, like other halogenated chemicals, have been well documented and thus the frequent occurrence of PFAS in the water environment is a recent global concern. After US Environmental Protection Agency (EPA) released a drinking water health advisory for the two most detected long chain PFAS (such as perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS)), industrial production and application of short chain PFAS continues to rise. Feasible and sensible treatment strategies are in dire need for environmental …
Vistas: Vocational Immersive Storytelling Training And Support Framework For Augmenting Work Performance, Sanika Doolani
Vistas: Vocational Immersive Storytelling Training And Support Framework For Augmenting Work Performance, Sanika Doolani
Civil Engineering Theses - Archive
Training and assessment of novice workers are the most vital part of any vocational industry. Innovations in science and technology have led to the creation of new industries and occupations, enhanced productivity and quality of work-life, and increased the potential for more people to participate in the workforce. However, these come at the risk and disadvantage of an increased cost of training and lack of proper training in industries, such as manufacturing. Recently, the use of Extended Reality (XR) systems has been on the rise to tackle various domains such as training, education, safety, etc. With the recent advances in …
Numerical Simulation Of Anchor Group Effects On Concrete Breakout Strength Within Steel Fiber Reinforced Concrete, Harjasdeep Singh Chauhan
Numerical Simulation Of Anchor Group Effects On Concrete Breakout Strength Within Steel Fiber Reinforced Concrete, Harjasdeep Singh Chauhan
Civil Engineering Theses - Archive
This study aims to investigate numerically, the effect of anchor groups on concrete breakout strength using nonlinear finite element analysis. Steel headed studs were cast in place within concrete of different amounts of steel fibers. Different proportions of steel fibers (0%, 0.5%, 1%, 1.5%) were utilized within steel fiber reinforced concrete (SFRC) for the numerical simulation. The physical properties of SFRC were modelled with respect to its composite compressive and tensile strength obtained from the experiments. The analysis was conducted on the concrete breakout strength of anchor bolts within SFRC. A good agreement was achieved between the numerical and the …
Effect Of Modified Moisture Barrier In Mitigating Pavement Distresses Due To Expansive Subgrade, Pratibha Pandey
Effect Of Modified Moisture Barrier In Mitigating Pavement Distresses Due To Expansive Subgrade, Pratibha Pandey
Civil Engineering Dissertations - Archive
Surficial distresses in roadways of Texas are very common due to presence of high plastic clayey soil in the subgrade. Increased sensitivity of high plastic clay towards seasonal moisture change results in repeated swelling and shrinkage, and ultimately the development of pavement cracks. Annual expenses of such distresses impose huge financial liability to maintenance authorities. Studies have indicated rainwater intrusion into underlying expansive subgrade soil coupled with inadequate drainage as the main cause of pavement damage in semi-arid regions. The inability of drainage layer to laterally drain the excess moisture may lead to moisture accumulation within the base layer which …
Evaluation And Retrofitting Of Prestressed Concrete Girder Bridge With Excessive Vibration, Ikram Hasan Efaz
Evaluation And Retrofitting Of Prestressed Concrete Girder Bridge With Excessive Vibration, Ikram Hasan Efaz
Civil Engineering Dissertations - Archive
Vibration of a highway bridges is a serviceability issue according to American Association of State Highway and Transportation Officials (AASHTO). Though vibration is one of the primary reasons of bridge deck cracking, AASHTO only has a deflection limit to counterpart vibration which is not adequate according to many researchers. For instance, SH-75 SB Bridge over Wilson Creek in McKinney, Texas was observed to have excessive vibration and cracking on the concrete deck. To evaluate the condition of the bridge, Ground Penetrating Radar (GPR) and Impact Echo (IE) were used on the deck as Non-Destructive Evaluation (NDE) methods. A diagnostic load …
Effect Of Sludge Content On Different Types Of Food Waste Degradation In Anaerobic Digester, Mumtahina Binte Latif
Effect Of Sludge Content On Different Types Of Food Waste Degradation In Anaerobic Digester, Mumtahina Binte Latif
Civil Engineering Theses - Archive
Food waste (FW) is the second-largest component in landfills which impacts environments adversely by generating excessive leachate and greenhouse gas. Generally, conventional anaerobic digester and composting can be used for FW disposal. However, the former is highly expensive while the latter is energy inefficient. In contrast, household or community level underground anaerobic digester offers a cost-efficient solution as well as retrieves valuable energy from FW. The addition of nutrients such as sludge to organic waste especially FW accelerates the production of energy by limiting volatile fatty acid (VFA) accumulation. The objective of the current study is to find out the …
An Analytical, Numerical, And Experimental Study Of Automated Damage Assessment For Concrete Structures, Sanggoo Kang
An Analytical, Numerical, And Experimental Study Of Automated Damage Assessment For Concrete Structures, Sanggoo Kang
Civil Engineering Dissertations - Archive
This dissertation presents the automated damage assessment studies for concrete structure. Three major studies are performed to: 1) understand the theoretical wave scattering model to evaluate the internal vertical crack, 2) to validate the theoretical wave scattering model through FE simulations with experimental measurements, and 3) to advance practical automated crack evaluation (ACE) system for vertical crack and delamination detection. Firstly, singular integral solutions are studied to investigate scattering of Rayleigh waves by subsurface cracks. Defining a wave scattering model by objects, such as cracks, still can be quite a challenge. The model’s analytical solution uses five different numerical integration …
Characterization Of Msw And Plastic Waste Volume Estimation During Covid-19 Pandemic, Sehneela Sara Aurpa
Characterization Of Msw And Plastic Waste Volume Estimation During Covid-19 Pandemic, Sehneela Sara Aurpa
Civil Engineering Theses - Archive
COVID-19 has appeared and shook all aspects of our life. Starting from panic buying prior lockdown to the availability of vaccine, the whole world has gone through a pandemic situation which bounded people to live a life that never seemed normal before. Lockdown and risk of spreading disease forced people to stay at home and generate more waste, especially plastic waste. The effect on municipal solid waste characteristics due to this shift in the way of living is assessed in this study. In this study, municipal solid waste was collected from the working face of Irving Hunter Ferrell landfill. Waste …
Feasibility Assessment Of Production Of Liquid Organic Fertilizer (Lof) From Food Waste For Sustainable Waste Management, Shadman Sakib
Feasibility Assessment Of Production Of Liquid Organic Fertilizer (Lof) From Food Waste For Sustainable Waste Management, Shadman Sakib
Civil Engineering Theses - Archive
The increasing volume of food waste is responsible for the generation of potent greenhouse gases and is resulting in the wastage of valuable resources. In all regions of the world, the percentage of food waste in municipal solid waste is greater. Due to the lack of waste segregation at collection points and modern waste disposal methods in developing countries, organic waste is piling up in the dumpsites and landfills. Besides due to poor harvest and post-harvest procedures and inefficient supply chain, almost 55% of the cultivated crops do not even reach the consumers and get wasted. On the other hand, …
A Comprehensive Framework To Mitigate Surficial Slope Failures, Burak Boluk
A Comprehensive Framework To Mitigate Surficial Slope Failures, Burak Boluk
Civil Engineering Dissertations - Archive
Each year, numerous highway and dam slopes that are built with high plasticity clays experience shallow slope failures. Besides the high maintenance and repair costs, these failures negatively impact the public life by interrupting the traffic flow and causing serious safety hazards. The development of desiccation cracks due to weathering cycles deteriorates hydro-mechanical properties of soil, increases water infiltration, and ultimately results in surficial slope failure. Several slope rehabilitation methods have been developed to stabilize clayey soil slope sections affected by surficial failures. Lime stabilization is an effective treatment method that generally reduces the swell-shrink potential of expansive soil and …
Pavement Temperature Response To Cold Fronts: A Model Column Study In A Freezer Box, Taryn Dilorenzo
Pavement Temperature Response To Cold Fronts: A Model Column Study In A Freezer Box, Taryn Dilorenzo
Civil Engineering Theses - Archive
The correlation of meteorological data and pavement conditions is crucial for winter pavement maintenance, this is the main reason that it is so important to understand in what ways pavement responds to cold fronts as well as when the formation of ice on a pavement surface can be expected. The pavement surface and its underlying subsurface layers combine to create a system with the behavior of the surface being influenced by both the air temperature above it, as well as the temperature and thermodynamic processes occurring in the sublayers below it. Both the pavement surface as well as the sublayers …
Flexural Strengthening Of Two-Way Slabs Using Cfrp External Laminates, Shams Abbas Naqvi
Flexural Strengthening Of Two-Way Slabs Using Cfrp External Laminates, Shams Abbas Naqvi
Civil Engineering Theses - Archive
Deterioration of reinforced concrete structures with time is a common phenomenon, which often leads to reduction in the load carrying capacity. To meet the coding requirements, strengthening of these structures is of utmost importance. Composite materials, such as Carbon Fiber Reinforced Polymers (CFRP), have shown effective results in external strengthening of these structures. However, premature delamination of CFRPs can decrease their efficiency. Recently, pre-saturated CFRP (PS-CFRP), a new type of CFRP pre-impregnated with epoxy resin, was introduced. Previous research has shown that PS-CFRP has shown improved results as compared to regular CFRP (R-CFRP) for strengthening beams and columns. However, no …