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Articles 211 - 240 of 302
Full-Text Articles in Civil Engineering
A Decision Support System Tool For Dynamic Pricing Of Managed Lanes, Maryam Zabihi
A Decision Support System Tool For Dynamic Pricing Of Managed Lanes, Maryam Zabihi
Civil Engineering Dissertations - Archive
Congestion pricing and managed lanes (ML) have been recently gaining interest around the country as a congestion management tool and as a means of revenue generation for facility maintenance and expansion as well repayment of highway construction debts. Congestion pricing in MLs entails one of several strategies, including time of day pricing, dynamic pricing based on predicted/anticipated traffic conditions, and real-time dynamic pricing based on actual traffic conditions. The overall goal of this study has been to develop a Decision Support System (DSS) tool based on drivers’ revealed willingness to pay (WTP) values. This should determine more effective dynamic toll …
Evaluation Of Structural Capacity Of Epoxy-Coated Concrete Pipes And Its Interaction With Soil, Elmira Riahi
Evaluation Of Structural Capacity Of Epoxy-Coated Concrete Pipes And Its Interaction With Soil, Elmira Riahi
Civil Engineering Dissertations - Archive
Rehabilitation of concrete structures by using synthetic resins such as epoxy is increasing worldwide. Understanding the structural behavior of the resultant composite structure and the interaction between the coating and concrete can be beneficial in predicting performance of the rehabilitated structure. However, very little is known about the strength of the epoxy-coated concrete. This researcher conducted laboratory experiments designed to evaluate epoxy coated concrete specimens under different load configurations with an emphasis on its stress-strain characteristics. The tests include uniaxial compression cylindrical specimens, three-point and four-point bending and tests on beam specimens and three-edge bearing tests on concrete pipe specimens. …
Improving Hydrologic Prediction For Large Urban Areas Through Stochastic Analysis Of Scale-Dependent Runoff Response, Advanced Sensing And High-Resolution Modeling, Amir Norouzi
Civil Engineering Dissertations - Archive
Due to urbanization and climate change, large urban areas such as the DallasFort Worth Metroplex (DFW) area is vulnerable not only to river flooding but also flash flooding. Due to the nonstationarities involved, projecting how the changes in land cover and climate may modify flood frequency in large urban areas is a challenge. Part I of this work develops a simple spatial stochastic model for rainfall-to-areal runoff in urban areas, evaluates climatological mean and variance of mean areal runoff (MAR) over a range of catchment scales, translates them into runoff frequency as a proxy for flood frequency, and assesses its …
Sustainability Assessment Of Recycled Asphalt Mixtures In Texas, Reza Saeedzadeh
Sustainability Assessment Of Recycled Asphalt Mixtures In Texas, Reza Saeedzadeh
Civil Engineering Dissertations - Archive
The pavement practitioners use more recycled materials in asphalt mixtures in order to compensate for the high price of petroleum products and save the limited resources of virgin materials. Reclaimed Asphalt Pavement (RAP) and Recycled Asphalt Shingles (RAS) have been in wide use in asphalt mixtures for several decades. Public perception on the utilization of recycled materials is that the mixtures become more cost effective and more environmental friendly. This is true when the initial stage of construction of pavements is assessed. However, a mixture that costs less and/or burdens the environment less at the beginning may require more frequent …
Strengthening Of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (Cfrp), Tariq Al Jaafreh
Strengthening Of Lightweight Reinforced Concrete Beams Using Carbon Fiber Reinforced Polymers (Cfrp), Tariq Al Jaafreh
Civil Engineering Dissertations - Archive
This research aimed to investigate the effect of utilizing “Fiber Reinforced Polymer” (FRP) on the light weight concrete beams. The main hypothesis is that such utilization of the FRP will lead to strengthened lightweight beams. The research that has been done on this relationship is somewhat broad in the scope and have mostly focused on the normal-weight concrete. However, only few studies that have considered the light weight concrete. Eight Beams were tested in this research under four point bending test. Two beams were taken as a control beams without any external bonding of Carbon Fiber Reinforced polymer. Another two …
Enhanced Seismic Performance Of Special Truss Moment Frames And Staggered Truss Framing System For Seismically Active Areas, Sanputt Simasathien
Enhanced Seismic Performance Of Special Truss Moment Frames And Staggered Truss Framing System For Seismically Active Areas, Sanputt Simasathien
Civil Engineering Dissertations - Archive
Due to their ability to achieve large column-free floor spaces, special truss moment frames (STMFs) and staggered truss frames (STFs) are unique valuable options for structural engineers. However, although STMFs and STFs offer a wide range of structural, architectural, and economical benefits, limited research data is available on the seismic performance of these systems. STMF system is a relatively new type of steel framing system for use in high seismic areas. STMFs dissipate earthquake energy through ductile special segments located near the mid-span of the truss girders, while the other members outside the special segment, including truss members, columns, and …
Investigation Of Strength-Enhancement Mechanism And Size Effect On Ultimate Shear Strength Of Steel Fiber-Reinforced Concrete (Sfrc) Slender Beams, Mohammad Reza Zarrinpour
Investigation Of Strength-Enhancement Mechanism And Size Effect On Ultimate Shear Strength Of Steel Fiber-Reinforced Concrete (Sfrc) Slender Beams, Mohammad Reza Zarrinpour
Civil Engineering Dissertations - Archive
This research study consists of two separate phases. In the first phase, an experimental study was conducted to identify the shear-enhancement and failure mechanisms behind the ultimate shear strength of steel fiber-reinforced concrete (SFRC) slender beams by utilizing the full field deformation measuring capability of digital image correlation (DIC) technology. A total of 12 large-scale simply supported SFRC and RC beams with a range of heights including 12 in. (305 mm), 18 in. (457 mm), 24 in. (610 mm), 36 in. (915 mm), and 48 in. (1220 mm) were tested under monotonic point load. The greater shear strength in SFRC …
Improving Water Quality Forecasting Using Data Assimilation, Hamideh Riazi
Improving Water Quality Forecasting Using Data Assimilation, Hamideh Riazi
Civil Engineering Dissertations - Archive
Population growth increases agricultural, industrial and human activities which threaten the quality of water resources, especially water supply sources such as lakes and reservoirs. In potentially high-impact situations such as algal blooms, active measures such as controlled release from reservoirs may be necessary. To minimize release while meeting the water quality requirements, accurate short-range water quality forecast is necessary. Because watershed water quality models have a large number of state variables most of which are never observed, their initial conditions (IC) are subject to large uncertainties which may propagate into large forecast errors. In this research, a data assimilation (DA) …
Thermo-Hydro-Mechanical Behavior Of Unsaturated Clayey Soils Via Thermo/Suction-Controlled Ring Shear Testing, Jairo Edmundo Yepes Heredia
Thermo-Hydro-Mechanical Behavior Of Unsaturated Clayey Soils Via Thermo/Suction-Controlled Ring Shear Testing, Jairo Edmundo Yepes Heredia
Civil Engineering Dissertations - Archive
There is a lot of geotechnical infrastructure made of compacted soil, or resting on unsaturated ground, which involves a wide range of deformations. Calculation of foundation settlement, for instance, requires a good estimation of soil stiffness at relatively small strains. Analysis of natural and engineered earth slopes, embankments, and soil bearing capacity, on the other hand, requires good estimations of shear strength, from peak to residual. Besides, despite the critical importance of the thermo-mechanical behavior of unsaturated soils in many geotechnical applications, the effect of relatively high temperature on shear strength and stiffness properties of unsaturated soils is not yet …
Enhanced Shrinkage Characterization Of Clayey Soils, Raju Acharya
Enhanced Shrinkage Characterization Of Clayey Soils, Raju Acharya
Civil Engineering Dissertations - Archive
Surficial slope failure is a common problem experienced by most of the compacted earth dams in Texas and several other southern states in USA as a result of desiccation or shrinkage induced cracking of the surficial soils. Cracking of the soil occurs when the tensile stress exceeds the tensile strength during drying process. Tensile stress increases with an increase in shrinkage strain and thus soil chemical admixtures can reduce the tensile stress by reducing the shrinkage potential of soil. Inclusion of such admixtures invariably affects the tensile strength. Yet there are not many test methods that could be utilized for …
Comprehensive Neural Network Forecasting System For Ground Level Ozone In Multiple Regions, Gautam Raghavendra Eapi
Comprehensive Neural Network Forecasting System For Ground Level Ozone In Multiple Regions, Gautam Raghavendra Eapi
Civil Engineering Dissertations - Archive
A comprehensive neural network daily maximum 8 hour-ozone forecasting model was developed based on five years of data (2010-2014) collected from 50 monitoring sites from the Dallas Fort Worth, Houston-Galveston-Brazoria, Los Angeles, San Joaquin and San Diego regions. This work represents the first neural network developed to forecast ozone in multiple regions, as well as multiple sites in the same region. Previous studies have developed separate neural network models to forecast ozone at each location. Two stages of feature selection were applied to reduce input vector dimension and redundancy. These are Piecewise Linear Orthonormal Floating Search (PLOFS), and Karhunen - …
Development And Validation Of Tdr Based Sensors For Thermal Conductivity And Soil Suction Measurements, Nan Zhang
Civil Engineering Dissertations - Archive
Simultaneous measurement of soil thermal conductivity, moisture content, dry density and soil suction is a challenging issue and very important to the design of geothermal related structures such as geothermal energy piles (GEP), ground source heat pump (GSHP) systems borehole thermal energy storage (BTES) systems, etc. The measurement of these properties is mainly done in laboratory conditions which can be time consuming. Hence, an attempt is made in this research to determine a new field sensor that can provide these properties about time frame. TDR technique had been used successfully to measure soil moisture content and dry density by analyzing …
A Unified Swcc-Clay Mineralogy Based Framework For Predicting Swell Behavior Of Expansive Soils, Alejandro Hernan Pino Bravo
A Unified Swcc-Clay Mineralogy Based Framework For Predicting Swell Behavior Of Expansive Soils, Alejandro Hernan Pino Bravo
Civil Engineering Dissertations - Archive
Expansive soils are spread over different climatic zones around the world with varying mineralogical content and microstructure, making the soil to absorb moisture between their mineral layers and therefore undergo volume changes. This behavior generates swell and shrinkage surface movements which affect the integrity of infrastructure built on them. A practice currently employed correlates swell-shrink behavior to soil index parameters, however, variable soil mineralogy limits this approach, which generates poor soil swell characterization. Thus, characterizing efforts must be emphasized on identification of real parameters governing the swell/shrink behavior, such as mineralogy, variation of suction with moisture content and pore distribution. …
The Strength Of Horizontal Shear Reinforcement With Limited Development, Regina Nyambura Waweru
The Strength Of Horizontal Shear Reinforcement With Limited Development, Regina Nyambura Waweru
Civil Engineering Dissertations - Archive
In order for the composite action between the precast beam and the cast-in-place deck to be effective, sufficient horizontal (interface) shear strength needs to be provided at the interface of the two concrete elements to prevent slip. Horizontal shear strength is provided by three main components: the protrusions on the crack faces (cohesion/aggregate interlock), friction between the faces resulting from the normal compressive stress, and the dowel action of the reinforcing bars. AASHTO LRFD equation assumes that all reinforcement crossing the interface would be fully developed on both sides of the interface at ultimate shear strength. This study examines if …
Enhanced Viscoelastic Modeling Of Hot Mix Asphalt, Tito P. Nyamuhokya
Enhanced Viscoelastic Modeling Of Hot Mix Asphalt, Tito P. Nyamuhokya
Civil Engineering Dissertations - Archive
The primary objective of this research is to investigate the relationships between Compressive (CDM) and Tensile Dynamic Moduli (TDM) of Hot Mix Asphalt (HMA) and develop a material model that predicts tensile dynamic modulus from known compressive dynamic modulus. Moreover, the research develops an enhanced visco-hyper-elastic Finite element model that incorporates both CDM and computed TDM to predict the structural response of a perpetual pavement structure subjected to wheel loading. In the laboratory, the Compressive and Tensile Dynamic Modulus parallel to the direction of compaction and Tensile dynamic modulus perpendicular to the direction of compaction were determined at different temperature …
Development Of A Simplified Flexible Pavement Design Protocol For New York State Department Of Transportation Based On Aashto Me Pavement Design Guide, Ali Qays Abdullah
Development Of A Simplified Flexible Pavement Design Protocol For New York State Department Of Transportation Based On Aashto Me Pavement Design Guide, Ali Qays Abdullah
Civil Engineering Dissertations - Archive
New York State Department of Transportation (NYSDOT) has used the AASHTO 1993 Design Guide for the design of new flexible pavement structures for more than three decades. The AASHTO 1993 Guide is based on the empirical relationships developed for the data collected in the AASHO Road Test in the early 1960's. A newer pavement design method, called the Mechanistic-Empirical Pavement Design Guide (MEPDG) was developed by the National Cooperative Highway Research Program to provide a more efficient and accurate design method and based on sound engineering principles. The MEPDG models have been incorporated in the AASHTOWare Pavement ME 2.1 software …
Quantitative Non-Destructive Evaluation Of Rebar Diameter And Corrosion Damage In Concrete Using Ground Penetrating Radar, Md Istiaque Hasan
Quantitative Non-Destructive Evaluation Of Rebar Diameter And Corrosion Damage In Concrete Using Ground Penetrating Radar, Md Istiaque Hasan
Civil Engineering Dissertations - Archive
The purpose of this study is to develop new methods for quantitative estimation of rebar diameter and loss of area of rebar due to corrosion using Ground Penetrating Radar (GPR). The existing methods of determining the rebar diameter using GPR are not accurate and the existing methods for evaluating corrosion using GPR are qualitative. The study included in this dissertation uses a 2.6 GHz antenna to estimate the diameter of rebar using two different approaches. The approaches use digital image processing of GPR ragargrams and maximum normalized reflection amplitude form the rebar to estimate the diameter. A novel method to …
Discrete Element Modeling Of Geogrid Reinforced Granular Media, Asheesh Pradhan
Discrete Element Modeling Of Geogrid Reinforced Granular Media, Asheesh Pradhan
Civil Engineering Dissertations - Archive
Geogrids have proven to be economical solution in improving ground conditions for construction in foundations, retaining walls, railway tracks, and pavements. Hence researchers have started studying the geogrid reinforcement in detail to understand the working of geogrid and parameters affecting it. Following the advent of faster computers and efficient algorithms researcher have started using discrete element method (DEM) to study geogrid reinforcement since DEM provides particulate level of interaction and understanding and is the closest resemblance of the physical phenomenon. However, the research works are widely spread lacking comprehensive review of factors that can affect such models. This research studies …
Rainfall Induced Distress In Low Volume Pavements, Mahsa Hedayati
Rainfall Induced Distress In Low Volume Pavements, Mahsa Hedayati
Civil Engineering Dissertations - Archive
Annual expenses of distresses caused by volume change of expansive soils induce significant financial burden on maintenance authorities. The problems occur as the expansive soils within the unsaturated zone of the soil experience variation in moisture content. Swelling and shrinkage of the soils causes structural cracks, malfunction of piping and irrigation systems and loss of support for ground slabs. Due to their low stiffness, light loading and extensive construction, pavements are particularly vulnerable to the effects of expansive soils. Accurate understanding of behavior of expansive subgrade, interaction of subgrade pavement structure and incorporation of the results in design processes can …
Development Of Linear Regression Model For Predicting Water Quality Parameters From Anaerobic Treatment Of Vinasse, Shammi Rahman
Development Of Linear Regression Model For Predicting Water Quality Parameters From Anaerobic Treatment Of Vinasse, Shammi Rahman
Civil Engineering Dissertations - Archive
One of the most prominent biofuels today is ethanol. The production of ethanol from biomass, whether from sugar crops, starch crops, dairy products, or cellulosic materials, results in the production of a high-strength liquid waste called vinasse. Approximately 12 liters of vinasse are produced for every 1 liter of ethanol. Vinasse is high in solids and organic content, with biochemical oxygen demand (BOD) ranging from 30 to 40 g/L, and a low pH, typically from 3-5. Traditionally, in countries such as India, Brazil, and other Latin American countries, vinasse has been disposed of by applying it as a fertilizer on …
Effect Of Enhanced Leachate Recirculated (Elr) Landfill Operation And Gas Extraction On Greenhouse Gas Emission, Sonia Samir
Effect Of Enhanced Leachate Recirculated (Elr) Landfill Operation And Gas Extraction On Greenhouse Gas Emission, Sonia Samir
Civil Engineering Dissertations - Archive
The bioreactor/ enhanced leachate recirculated (ELR) landfill operation with the addition of moisture/ leachate to the landfill, accelerate the process of landfill waste decomposition; and increase the generation of LFG over a shorter period of time. Since emissions from the landfills are directly related to the gas generation, the increase in gas generation might also increase the emission from the landfill. On the contrary, the presence of gas extraction is suggested to mitigate the fugitive emissions from the landfills. Therefore, the motivation of the current study was to evaluate the effect of ELR operation as well as the gas extraction …
Estimation Of Optimum Compaction Level For Bioreactor Landfill Operation, Dipak Tiwari
Estimation Of Optimum Compaction Level For Bioreactor Landfill Operation, Dipak Tiwari
Civil Engineering Dissertations - Archive
The effect of compaction on the degradation of MSW is important for the successful operation of bioreactor landfill. It has been a general tendency to compact working face solid waste as much as possible to gain more space. Previous studies has shown moisture content, moisture recirculation and ambient temperature were important components for degradation. There was a limitation on the compaction effect on degradation. Although several studies were conducted in the past to find the hydraulic conductivity of the waste, there was lack of work to find the optimum compaction to achieve sufficient flow inside the landfill and thus to …
Spatial Variability Models And Prediction Analysis Of Soil Properties Using Geostatistics, Tejo Vikash Bheemasetti
Spatial Variability Models And Prediction Analysis Of Soil Properties Using Geostatistics, Tejo Vikash Bheemasetti
Civil Engineering Dissertations - Archive
Soils are composed of solid, water and air phases whose characteristics are highly variable. The interactions of these phases in the soil matrix can lead to different types of topographical formations and characteristics. Due to the uncertainty and complex interactions among these phases, studies on soils have always been a challenging problem for engineers. These variations and uncertainties make it necessary for engineers to adopt new techniques and methods to analyze soil properties in order to determine or interpret their generalized behaviors and patterns. Existing research in variability analysis tends to focus on the distribution of the soil properties, reliability-based …
Evaluation Of Lightweight Geofoam For Mitigating Bridge Approach Slab Settlements, Pinit Ruttanaporamakul
Evaluation Of Lightweight Geofoam For Mitigating Bridge Approach Slab Settlements, Pinit Ruttanaporamakul
Civil Engineering Dissertations - Archive
The bump at the end of a bridge infrastructure is one of the frequent problems found in Texas and other states. Transportation agencies spend millions of dollars annually to repair the bump problem. The major cause of the problem is the settlement of backfill materials and foundation soils, as well as the erosion of backfill. Research was undertaken at the University of Texas at Arlington to study the embankment located on US 67 over SH 174 in Johnson County, Cleburne, Texas. The embankment was reconstructed, replacing the top of existing fill soil with lightweight EPS 22 geofoam blocks to reduce …
Response Of Unsaturated Silty Sand Over A Wider Range Of Suction States Using A Novel Double-Walled Triaxial Testing System, Ujwalkumar Dashrath Patil
Response Of Unsaturated Silty Sand Over A Wider Range Of Suction States Using A Novel Double-Walled Triaxial Testing System, Ujwalkumar Dashrath Patil
Civil Engineering Dissertations - Archive
In recent decades, the state-of-the-art of our understanding of unsaturated soil performance has been considerably enhanced by incorporating novel and advanced features to the conventional testing devices such as direct shear device, ring shear device, triaxial device and true triaxial device. The novel suction-controlled triaxial system used in this research is fully automated and has enhanced features such as volume change device and double-walled cell to monitor the volume change accurately during all the stages of unsaturated triaxial test. Despite the sophistication, such devices can help in testing mechanical behavior of unsaturated soils only up to matric suction (s) value …
Numerical Modeling Of Ground Movements Associated With Trenchless Box Jacking Technique, Babak Haji Mohammad Hasan Mamaqani
Numerical Modeling Of Ground Movements Associated With Trenchless Box Jacking Technique, Babak Haji Mohammad Hasan Mamaqani
Civil Engineering Dissertations - Archive
The Trenchless Technology (TT) is defined as a family of methods used to install, renew, replace or renovate new pipe/box or existing pipe/box underground with little or no surface disruption. TT is divided into two main categories including Trenchless Construction Methods (TCMs) and Trenchless Renewal Methods (TRMs). TCMs are used to install new utilities and pipes underground while TRMs are used to renew, renovate and replace an existing utility or pipe. Box jacking (BJ) is a TCM used to install rectangular box culverts under existing facilities such as highways and railroads. In this method, box culverts are pushed through the …
Evaluation Of Physico-Mechanical Properties Of Clayey Soils Using Electrical Resistivity Imaging Technique, Golam Kibria
Evaluation Of Physico-Mechanical Properties Of Clayey Soils Using Electrical Resistivity Imaging Technique, Golam Kibria
Civil Engineering Dissertations - Archive
Resistivity imaging (RI) is a promising approach to obtaining continuous profile of soil subsurface. This method offers simple technique to identify moisture variation and heterogeneity of the investigated area. However, at present, only qualitative information of subsurface can be obtained using RI. A study on the quantification of geotechnical properties has become important for rigorous use of this method in the evaluation of geohazard potential and construction quality control of landfill liner system. Several studies have been performed to describe electrical resistivity of soil as a function of pore fluid conductivity and surface conductance. However, characterization tests on pore water …
Development Of Statistical Models For Predicting Leachate Parameters From Simulated Landfills, Arpita Hetal Bhatt
Development Of Statistical Models For Predicting Leachate Parameters From Simulated Landfills, Arpita Hetal Bhatt
Civil Engineering Dissertations - Archive
Leachate generation and management is recognized as one of the greatest problems associated with environmentally sound operation of landfills, as leachate can cause major pollution problems to surrounding soil, ground water, and surface waters. There are many landfills, especially in developing parts of the world like India, Bangladesh, Africa, and Latin America, where open dump systems are used for final disposal of solid waste rather than engineered landfills. In the near future, regulations in developing countries will likely require installation of liner systems, leachate collection systems, and treatment operations. A major requirement for successful leachate treatment is quantifying its typical …
Staged Construction Modeling Of Large Diameter Steel Pipes Using 3-D Nonlinear Finite Element Analysis, Mojtaba Salehi Dezfooli
Staged Construction Modeling Of Large Diameter Steel Pipes Using 3-D Nonlinear Finite Element Analysis, Mojtaba Salehi Dezfooli
Civil Engineering Dissertations - Archive
This study investigates the performance of large diameter steel pipes during stage construction. Using this study, metal pipes are designed utilizing existing native soil for embedment around the pipe rather than imported materials. This indeed, translates into a considerable amount of cost saving and advances in designing pipeline. This model is used for peer review/ designing of a 242 km (150 miles) pipeline project, Integrated Pipeline (IPL), that transports approximately hundreds of millions of gallons from Lake Palestine, 137 km (85 miles) southeast of Dallas, to Lake Benbrook, Tarrant County, Texas. The IPL project supplies water to more than1.8 million …
A Comparative Study Of Carbon Nanotubes And Granular Activated Carbon: Physicochemical Properties And Adsorption Capacities, Roja Haritha Gangupomu
A Comparative Study Of Carbon Nanotubes And Granular Activated Carbon: Physicochemical Properties And Adsorption Capacities, Roja Haritha Gangupomu
Civil Engineering Dissertations - Archive
Adsorption technologies with activated carbon have proven their prominence in wide variety of industrial applications for the removal of pollutants from gaseous streams for generations. Nanoadsorbents due to their unique structure and the presence of high-energy binding sites can enhance adsorption of pollutants, particularly for hazardous pollutants difficult to control using conventional sorbents like activated carbon and can help industries in their struggle for greener technologies. The objective of this study was to characterize raw and purified CNTs and compare their physical and chemical properties to commercially available granular activated carbon (GAC). The CNT purification process was done in two …