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Articles 601 - 630 of 677
Full-Text Articles in Civil Engineering
Building Pressure Tests Of Fiber-Reinforced Foam-Based Lightweight Concrete Precast Wall Panels, Francheska Enid Seijo
Building Pressure Tests Of Fiber-Reinforced Foam-Based Lightweight Concrete Precast Wall Panels, Francheska Enid Seijo
Civil Engineering Theses - Archive
Instrumentation and procedures for building pressure tests were designed as a means of providing new wind pressure test methods for full-scale building models. Fiber-reinforced foam-based lightweight concrete precast wall panels were studied in this investigation. Three (3) full-scale prototype buildings were tested for this purpose. To determine the material properties and design parameters for this targeted 90 pcf (1,446 kg/m3) cellular lightweight concrete and to gain overall knowledge of its behavior, some tests such as compressive strength test, pull-out strength test, and flexural strength test were performed. The wind pressure tests performed provided results for strength, maximum wind pressure the …
Subsurface Investigations Using High Resolution Resistivity, Dharmateja Maganti
Subsurface Investigations Using High Resolution Resistivity, Dharmateja Maganti
Civil Engineering Theses - Archive
Electrical resistivity imaging has been proved to be well suited to produce images of subsurface conditionsbecause of the ability of the technique for detecting resistive features and discriminating subtle resistivity variations in the soil media. Electrical resistivity imaging survey was performed at E. Center Development in Duncanville, Texas. The survey was conducted using SuperSting R8/IP Multi-channel Resistivity Imaging System to image the subsurface structure. Both 2-D and 3-D electrical resistivity imaging tests were conducted using dipole-dipole array at 2 feet, 5 feet and 20 feet electrode spacing. Earth Imager 2D and Earth Imager 3D software's were then used to invert …
Life Cycle Assessment Of Bio-Material Stabilized Expansive Soils, Ranjith Samuel Rosenberk
Life Cycle Assessment Of Bio-Material Stabilized Expansive Soils, Ranjith Samuel Rosenberk
Civil Engineering Dissertations - Archive
Pavement cracking is one of the major maintenance works that requires millions of dollars in repair costs annually. Pavement cracks are formed due to moisture and temperature fluctuations in the soil. Stabilization of pavement shoulder subsoil with the addition of compost material was studied for preventing pavement cracks. Eight different compost materials with three major feed stock sources such as biosolids, wood waste, and animal manure were investigated in this research. Compost treatment studies were performed at four different test sites located in various regions of the state of Texas. Laboratory experiments were conducted completed compost manufactured topsoil's (CMTs) to …
Effects Of Calcium-Based Treatment On Organic Soil Behavior, Srujan Rao Chikyala
Effects Of Calcium-Based Treatment On Organic Soil Behavior, Srujan Rao Chikyala
Civil Engineering Theses - Archive
Organic soils are found in many places around the world. Organic soils undergo large secondary settlements depending on the amount of organic matter present in the soil Organic soil is a mixture of finely divided particles of organic matter, in some instances visible fragments of partly decayed vegetable matter and shells are also present in the organic matter. In order to reduce the secondary settlements caused by organic matter, soil is treated with different stabilizing agents. The difficulties associated with organic soils arise when they are treated with cement or lime stabilizers, as organic matter inhibits cementitious reactions responsible for …
Impact Of Lateral Swell Pressure On Retaining Structure Design Using Expansive Cohesive Backfill, Mark G. Thomas
Impact Of Lateral Swell Pressure On Retaining Structure Design Using Expansive Cohesive Backfill, Mark G. Thomas
Civil Engineering Theses - Archive
Since cohesive soils are difficult to drain once becoming saturated, in order to reduce lateral earth pressures exerted by saturated cohesive soils on retaining structures, retaining wall designs most always specify use of drainable granular backfill. However, costs for the importation of granular backfill materials continues to increase due to depletion of these materials in certain areas, and to the ever-increasing costs for material transportation, largely related to increased labor and fuel prices. These factors, together with the costs of removing replaced cohesive materials, and coupled with resource and environmental conservation concerns, are driving efforts to develop reasonable and prudent …
Non-Linear Finite Element Dynamic Analysis Of Tapered Hollow Steel Poles For Passive Base Isolation, Tri Le
Non-Linear Finite Element Dynamic Analysis Of Tapered Hollow Steel Poles For Passive Base Isolation, Tri Le
Civil Engineering Dissertations - Archive
Long tapered poles are commonly used to support Closed Circuit Television (CCTV) Cameras for security and traffic monitoring. Images received from CCTV are normally distorted depending on the wind induced vibration characteristics of the forcing function. To reduce image distortion, three approaches are integrated to optimize the process, which are: (1) development of equations for pole's frequency of vibration in terms of its geometric variables; (2) development of a mechanical damping device to isolate the pole's vibration from that of the camera; and (3) development of an electrical image processing device for image corrections. The identification of a pole's natural …
Dynamic Properties Of Compacted Soils Using Resonant Column With Self-Contained Bender Elements, Roshnara Mohammad
Dynamic Properties Of Compacted Soils Using Resonant Column With Self-Contained Bender Elements, Roshnara Mohammad
Civil Engineering Theses - Archive
A comprehensive series of resonant column and bender elements tests were simultaneously performed in the developed RC/BE apparatus. RC/BE tests were conducted on compacted specimens of poorly graded sand (SP) and high plasticity clay (CH) prepared at different moisture contents (17.7, 22.1, 25.5, 30.2% by weight for clay, and 5, 10, 15, 20% by weight for sand) and under different confining pressures (0, 2.5, 5.0, and 10.0 psi, or 0, 17.2, 34.4, 69.0 kPa) in order to assess the influence of key environmental factors, such as compaction induced suction and confining pressure, on small-strain stiffness properties of unsaturated soils, such …
Clay Mineralogy Effects On Long-Term Performance Of Chemically Treated Expansive Clays, Bhaskar Chandra Srinivas Chittoori
Clay Mineralogy Effects On Long-Term Performance Of Chemically Treated Expansive Clays, Bhaskar Chandra Srinivas Chittoori
Civil Engineering Dissertations - Archive
Stabilization of expansive soils using chemical additives such as cement and lime had been in use for several decades and these treatments provide riding comforts to travelers. However, many state Departments of Transportation (DOTs) in the United States have had problems with subgrade failure even after stabilization with chemical additives due to a loss of stabilizer over time, or a stabilizer being ineffective in some soils while other soils with the same index properties respond well to that stabilizer. These problems are attributed to the limitations of the current procedures of stabilization for pavement subsoil layers. One such limitation is …
Construction Cost Of Underground Infrastructure, Seyed Behnam Hashemi
Construction Cost Of Underground Infrastructure, Seyed Behnam Hashemi
Civil Engineering Theses - Archive
Renewal of aging underground infrastructure is a major challenge that municipalities inNorth America face every day. Traditional replacement or renewal of these underground utilitiesuses open-cut excavation methods that can be disruptive to everyday life of citizens andexpensive, particularly in built-up areas and in projects with difficult ground and site conditions. Incontrast, trenchless technologies use innovative methods, materials, and equipment that requireminimum surface excavation to renew and construct aging underground infrastructure. Thesenew methods are considered to be more safe, cost-effective, efficient and productive thanconventional open-cut projects. However, to select trenchless technologies in utility design,consulting engineers and utility owners need to compare …
Adsorption Curve Fits For Landfill Vocs On Bituminous Coal Based And Coconut Shell Based Activated Carbon, Annaprabha Athappan
Adsorption Curve Fits For Landfill Vocs On Bituminous Coal Based And Coconut Shell Based Activated Carbon, Annaprabha Athappan
Civil Engineering Theses - Archive
This study explores adsorption as a method of controlling hazardous gas emissions from Municipal Solid Waste Landfills (MSWL). In particular, the hazardous air pollutants (HAPs) para, meta, and ortho-xylene, ethylbenzene and methyl ethyl ketone are selected for experimental study. Activated carbon is a good adsorbent and well known for its high surface area. Among the many varieties of activated carbon, bituminous coal based activated carbon (BPL) and coconut shell based activated carbon (OVC) are compared in this study. Each experiment was conducted in a vial with a known amount of carbon in it. The pollutant concentration remaining in the vial …
Assessing Control Strategies For Ground Level Ozone, Neelesh Vijay Sule
Assessing Control Strategies For Ground Level Ozone, Neelesh Vijay Sule
Civil Engineering Dissertations - Archive
Developing cost effective control strategies for ozone has been a challenge to air quality modelers. Conventionally, the control strategies are applied across-the board to the region. The main aim of this research was to develop a Decision-Making Framework (DMF) for evaluating and optimizing the selection of ozone control strategies. Conventional across-the-board reductions conduct emission reductions uniformly throughout the region and throughout the day. By contrast, this dissertation studied targeted reductions, in which emission sources of various types are reduced at various times and locations. The proposed DMF comprised of four phases: (1) Initialization, (2) Mining, (3) Metamodeling, and (4) Optimization. …
Measured And Theoretical Response Of Perpetual Pavement Structures, Miguel M. Portillo
Measured And Theoretical Response Of Perpetual Pavement Structures, Miguel M. Portillo
Civil Engineering Theses - Archive
The Kansas Perpetual Pavement experiment includes the construction of four pavement sections on the US-75 highway designed according to the perpetual pavement concept. The sections were instrumented with strain gauges and pressures cells to measure strains and stress at the bottom of the base layer and at the top of the subbase layer. Pavement response measurements were carried out in seven occasions between July 2005 and October 2007 with a loaded truck. Measured values obtained show that longitudinal and transverse values were almost always below the average endurance limit of 70 microstrains. The measurements also showed that temperature and vehicle …
Statistical Approach To The Development Of A Microscale Model For Estimating Exhaust Emissions Of Light Duty Gasoline Vehicles, Benjamin Nmai Afotey
Statistical Approach To The Development Of A Microscale Model For Estimating Exhaust Emissions Of Light Duty Gasoline Vehicles, Benjamin Nmai Afotey
Civil Engineering Dissertations - Archive
Today, air pollution is taking a growing toll on human health, the environment and the economy, despite decades of efforts to combat it. Although it was once a primary urban phenomenon in industrialized countries, today air pollution has spread worldwide. Mobile, industrial and natural sources constitute the major sources of air pollution. Around the world, major cities in industrialized countries have in recent times been battling air pollution from mobile sources. Beijing, New Delhi, Dallas/ Fort Worth and Los Angeles are no exceptions.Pronounced interest has focused on mobile source (vehicle exhaust) emissions in recent decades. A rapid increase in the …
Multi-Criteria Assessment For Supporting Freeway Operations And Management Systems, Auttawit Upayokin
Multi-Criteria Assessment For Supporting Freeway Operations And Management Systems, Auttawit Upayokin
Civil Engineering Dissertations - Archive
Freeway traffic congestion represents an increasing concern for urban areas throughout the United States. In addition, faced with limited roadway expansion alternatives, transportation agencies are considering investment in traffic management centers (TMCs) as a more viable way to operate and manage freeways effectively. The TMCs' responsibilities include monitoring roadway conditions using the various data collection strategies and determining performance measures for freeway operations. At the same time, traffic engineers at the TMCs may react to the traffic congestion problems by implementing operational strategies. In order to provide reliable decision support for TMC freeway operations and management systems, this dissertation aims …
Capacity Of Two-Sided Type C On Freeway With Four Lanes, Shadi Ghasemi-Majd
Capacity Of Two-Sided Type C On Freeway With Four Lanes, Shadi Ghasemi-Majd
Civil Engineering Theses - Archive
Weaving segments are categorized based on weaving length, configuration, number of lanes, free flow speed and weaving ratio. All these parameters affect weaving capacity. One of the objectives of this research was to extend Phong Thanh Vo's dissertation and study the relation between weaving capacity of two-sided type C on freeways with four lanes and any potential variables (mainalane demand, entrance ramp demand, exit ramp demand and weaving ratio). Micro-simulation has been used in order to analyze different capacity scenarios and the VISSIM calibrated model by Vo was used. Also, the effect of each of the VISSIM calibration parameters on …
The Effect Of Displacement Control Loading Histories On Genral Connecting Surfaces Using Finite Element Analysis, Sanjog Chandrakant Sabnis
The Effect Of Displacement Control Loading Histories On Genral Connecting Surfaces Using Finite Element Analysis, Sanjog Chandrakant Sabnis
Civil Engineering Theses - Archive
Displacement loading history provided by the AISC Seismic Provision 2002 is commonly used for experimental testing and analytical modeling of beam-to-column steel connection to stimulate the seismic effect. However, the basis for the above loading history is not documented in the literature. Thus, this study developed 25 cyclic load cases by varying the frequency and magnitude of the AISC-2002 loading within a predefined envelops. The 25 load cases are obtained from five different load sets in which the concept of uniform and non-uniform frequencies and amplitude are utilized. All the load cases are limited to the displacement equivalent to the …
Clay Mineral Quantification Using Gravemetric Analysis, Sarwenaj Ashraf
Clay Mineral Quantification Using Gravemetric Analysis, Sarwenaj Ashraf
Civil Engineering Theses - Archive
The current procedure used by the Texas Department of Transportation (TxDOT) to determine the type of stabilizer is based mainly on the Plasticity Index (PI) and the gradation of the soil. This method of stabilization does not always work because two soils with the same PIs can have very different shrink/swell potential, plastic limits or liquid limits, hence their behavior may be very different. This is mainly due to the fact that two soils that have the same PI can have very different clay mineral composition. Montmorillonite and kaolinite are the clay minerals that cause swelling/shrinking in soils.Chittoori (2008) had …
Studies On Field Stabilization Methods To Prevent Surficial Slope Failures Of Earth Fill Dams, Venkata S. Dronamraju
Studies On Field Stabilization Methods To Prevent Surficial Slope Failures Of Earth Fill Dams, Venkata S. Dronamraju
Civil Engineering Dissertations - Archive
Surficial failures are occurring frequently on the slopes of earthfill dams which are predominantly rainfall induced. Desiccation cracks form on the slope surface during dry environment which accelerates infiltration during rainfall. Infiltration causes increase of pore water pressures and saturation of soil mass in top layer resulting in surficial failures. Numerous surficial failures occurred on the slope of earthfill dams maintained by The United States Army Corps. of Engineers. The current research is undertaken at the University of Texas at Arlington with an objective of exploring the best field stabilization method to mitigate these surficial failures.Two sites, Joe Pool Dam …
Novel Stabilization Methods For Sulfate And Non-Sulfate Soils, Chakkrit Sirivitmaitrie
Novel Stabilization Methods For Sulfate And Non-Sulfate Soils, Chakkrit Sirivitmaitrie
Civil Engineering Dissertations - Archive
Expansive soils are commonly found in arid and semi-arid climate zone. These soils typically exhibit moderate to high plasticity, low to moderate strength, and high swell and shrinkage characteristic which in turn result in more swelling problems when the soil absorbs water. Both low strength characteristic and volumetric movements weaken the subgrade soils that they may lead to structural distress on road pavements. This research project was conducted at the City of Arlington, Texas. Soils in Arlington are known to be highly expansive. The expansive soils consist of both sulfate-rich soils and non-sulfate soils. This research project was conducted to …
Trends Of Vehicular Emissions For Clean Air Associates Precombustion Retrofit Device, Jaya Vani Nagireddi
Trends Of Vehicular Emissions For Clean Air Associates Precombustion Retrofit Device, Jaya Vani Nagireddi
Civil Engineering Theses - Archive
The research study objective was to find if there was any reduction in onboard exhaust emissions from a light duty passenger car (2007 Dodge Charger) with a Clean Air Catalytic Converter manufactured by Clean Air Associates, Inc. The research was conducted by the Civil and Environmental Engineering Department, University of Texas at Arlington as part of the North Central Texas Council of Governments Aftermarket Technology and Fuel Additive Research Program. Initially, emissions of pollutants were measured without the Clean Air Associates' retrofit device, called Baseline testing. A Horiba OBS-1300 On-Board System measured concentrations of the pollutants NOx, CO, CO2 and …
Modeling Unsaturated Soil Response Under Suction-Controlled Multi-Axial Stress States, Arthit Laikram
Modeling Unsaturated Soil Response Under Suction-Controlled Multi-Axial Stress States, Arthit Laikram
Civil Engineering Dissertations - Archive
In this research work, a novel suction-controlled true triaxial testing apparatus has been developed to test 3-in (7.5-cm) side, cubical specimens of unsaturated soil under controlled-suction states for a wide range of stress paths that are not easily achievable in a conventional cylindrical apparatus. The equipment is a mixed-boundary type of device, with the specimen seated on top of a high-air-entry ceramic disk and between five flexible (latex) membranes on the remaining sides of the cube. The new cell is an upgraded, more elaborate version of the one previously reported by Hoyos (1998), featuring two independent pore-air and pore-water pressure …
Ductile Lightweight Concrete For Lightweight Structural Application, Ake Piyamaikongdech
Ductile Lightweight Concrete For Lightweight Structural Application, Ake Piyamaikongdech
Civil Engineering Theses - Archive
This study developed a ductile concrete for precast wall systems which are capable of resisting high wind in excess of 500 mph. The developed concrete mix design consists of sand, cement, glass fiber, and a foaming agent to produce lightweight concrete in the range of 87 pcf (1392 kg/m3) to 90 pcf (1440 kg/m3). A comprehensive testing program for evaluation of the developed concrete material was undertaken. The mix designs were prepared both in the laboratory and in the mix truck with drum capacity of 27 ft3 (0.77 m3), and 177.6 ft3 (5 m3), respectively. The large concrete batches using …
The Effect Of Temperature On Fiber Composite Bridge Decks, Mahesh Gajula Nagabhushanam
The Effect Of Temperature On Fiber Composite Bridge Decks, Mahesh Gajula Nagabhushanam
Civil Engineering Theses - Archive
The use of Fiber composite honeycomb structure's as bridge decks gained importance, because of its low light weight and ease of installation. In this study, The Fiber composite bridge decks were subjected to thermal gradients. The Fiber composite bridge decks were fabricated in sizes of 2 feet x 8 feet x .5 feet and 4 feet x 8 feet x .5 feet specimens by Kansas structural composites Inc. The program consisted of 3 specimens of size 2 feet x 8 feet x .5 feet with ribs oriented along longitudinal direction, 3 specimens of size 2 feet x 8 feet x …
Deep Mixing Technology For Mitigation Of Swell-Shrink Behavior Of Expansive Soils Of Moderate To Deep Active Depths, Raja Sekhar Madhyannapu
Deep Mixing Technology For Mitigation Of Swell-Shrink Behavior Of Expansive Soils Of Moderate To Deep Active Depths, Raja Sekhar Madhyannapu
Civil Engineering Dissertations - Archive
Expansive soils are well known for their cyclic shrink-swell behavior due to seasonal related moisture changes. These cyclic movements of expansive soils are due to physico-chemical changes at particle level that are dependent on mineralogical composition of these soils. The subsoil depths susceptible to moisture changes are known as active zones and based on previous studies vary from shallow to deep depths. Movements from these active depths reflect to the surface and cause considerable damages to overlying infrastructures. These damages are slow and time dependent as the in situ moisture fluctuations are slow and continue with time. Since the current …
Comparison Of Distributed Versus Lumped Hydrologic Simulation Models Using Stationary And Moving Storm Events Applied To Small Synthetic Rectangular Basins And An Actual Watershed Basin, Michael Jay Shultz
Civil Engineering Dissertations - Archive
The purpose of this investigation is to compare simulations using several artificial rectangular basins and a real drainage basin for distributed and lumped hydrologic models via results obtained with the U.S. Geological Survey Modular Modeling System (MMS). Impervious watershed conditions were assumed for each simulation. A critical objective of this investigation is to assess the performance of a physically-simple lumped model compared to a more physically-complex distributed model for various storm events. Knowledge gained from this investigation may be applied to the practical problem of determining when either a distributed or lumped model may be expected to function well given …
Regression Model For Prioritization Of Corridors When Retiming Traffic Signals, Manjari G. Mittal
Regression Model For Prioritization Of Corridors When Retiming Traffic Signals, Manjari G. Mittal
Civil Engineering Theses - Archive
Traffic signals are used by transportation engineers to safely and efficiently manage vehicle, bicycle and pedestrian traffic on roadways. However, to maintain the effectiveness of traffic signals, traffic signals should be adjusted or retimed periodically to match the current traffic patterns. Traffic signal retiming is one of the most cost effective ways available to transportation engineers for reducing delays and mitigating congestion. A region may contain a large number of traffic signals all of which cannot be retimed at once due to limited availability of funds and other resources; only a subset of signals can be retimed at any given …
Vehicular Emissions Models Using Mobile6.2 And Field Data, Abhishek Yerramalla
Vehicular Emissions Models Using Mobile6.2 And Field Data, Abhishek Yerramalla
Civil Engineering Theses - Archive
Regression models to predict vehicular emissions for different categories of vehicles for different pollutants are presented in this thesis. Vehicular emissions are affected by numerous variables which, among others, include speed, temperature, acceleration, deceleration, driving behavior and meteorological data. Regression models are developed based on data obtained from Mobile 6.2 and on-board emissions measurements. The U.S. Department of Transportation (US DOT) conducted sensitivity analysis of Mobile6 where they evaluated different parameters used to find the emission factors, such as vehicle miles traveled, speed, humidity, etc. The sensitivity analysis investigated the overall Mobile6.2 model behavior for various conditions. In the analysis, …
Experimental And Field Monitoring Studies On Recycled Materials As Pavement Bases, Sunil Kumar Sirigiripet
Experimental And Field Monitoring Studies On Recycled Materials As Pavement Bases, Sunil Kumar Sirigiripet
Civil Engineering Theses - Archive
Natural aggregates derived from a variety of source rocks have been used as a road base material. But the extraction of natural aggregates resources is increasingly being constrained by urbanization, increased costs and environmental concerns. Thus, increased amounts of reclaimed materials are being used to supplement natural aggregates in road construction. Recycled Asphalt Pavement (RAP) material is one of the important recycled materials used in the present geotechnical applications. Many agencies are constantly seeking to reap the benefits of utilizing RAP. Main advantages of utilizing RAP include the preservation of the existing profile, conservation of asphalt and aggregate resources, conservation …
The Travel Behavior Of Minority Cohorts In Texas, Gustavo A. Jimenez Vera
The Travel Behavior Of Minority Cohorts In Texas, Gustavo A. Jimenez Vera
Civil Engineering Theses - Archive
Texas is changing dramatically; the most conservative population forecast indicates that Hispanics will account for 50% of the Texas population before 2035. Not only is the number of Hispanics on the rise in Texas, but also the foreign-born share has increased dramatically over the last 15 years. The State of Texas is now a majority minority state, and minority cohorts are expected to grow and become more than 65% of the Texas population before 2035. Transportation professionals in the State of Texas are wondering how these demographic changes will affect the transportation system. To gain an understanding of this, one …
Roadway Shallow Water Flow Modeling By Velocity Distribution, Chirakarn Sirivitmaitrie
Roadway Shallow Water Flow Modeling By Velocity Distribution, Chirakarn Sirivitmaitrie
Civil Engineering Dissertations - Archive
Manning's equation is a widely used method for determining flow discharge in a channel with unconfined gravity flow. The roughness value, n-value, is a critical factor for Manning equation to obtain the accurate amount of flow. A precise estimation of Manning "n" is difficult to obtain and varies by investigator justification and experience. Flow on a roadway is a type of open channel flow normally determined by Manning's equation. To ensure reliability and highway safety, the hydraulic geometry dimensions such as spread, depth and discharge must be accurately estimated. A Texas Department of Transportation Manning n-value research project collected data …