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Articles 181 - 210 of 325
Full-Text Articles in Civil Engineering
Development Of Finite Element Model For Analysis Of Prestressed Concrete Cylinder Pipe-Embedded Cylinder Pipe With Experimental Comparison, Sangit Rauniyar
Development Of Finite Element Model For Analysis Of Prestressed Concrete Cylinder Pipe-Embedded Cylinder Pipe With Experimental Comparison, Sangit Rauniyar
Civil Engineering Theses - Archive
Prestressed Concrete Cylinder Pipe (PCCP) is a composite pipe that consists ofconcrete and steel, which has layers of concrete core, steel cylinder, prestressing wire andmortar coating. PCCP is generally constructed of two types; a steel cylinder lined with aconcrete core and a steel cylinder embedded in a concrete core. The former type is calledPCCP-Lined Cylinder Pipe (PCCP-LCP) and the latter type is called PCCP-Embedded CylinderPipe (PCCP-ECP). The scope of this paper is limited to PCCP-ECP.PCCP-ECP is a composite material with complex stress phenomenon due to prestressand interaction between different layers of components. A three dimensional non-linear finiteelement model is generated …
Durability Studies Of Controlled Low Strength Material Using Native Soils As Fine Aggregates, Durga Praveen Reddy Vanga
Durability Studies Of Controlled Low Strength Material Using Native Soils As Fine Aggregates, Durga Praveen Reddy Vanga
Civil Engineering Theses - Archive
Controlled Low Strength Material using native soils as fine aggregates is an effective option in addressing issues relating to strength requirements, sustainability, and project cost. Using native soil in the place of conventional aggregate will greatly reduce the overall project costs and will enhance the sustainability of the project as it eliminates dumping of excavated material in a landfill. CLSM mixes, designed for the particular flowing characteristics as well as the compressive strength should maintain targeted engineering properties throughout its design life period to minimize long term maintenance cost. Though CLSMs do meet the short term strength requirements, their long-term …
Quantification And Geostatistical Mapping Of Soluble Sulfates In Soils Along A Pipe Line Alignment, Justin David Thomey
Quantification And Geostatistical Mapping Of Soluble Sulfates In Soils Along A Pipe Line Alignment, Justin David Thomey
Civil Engineering Theses - Archive
Sulfate induced heave is a growing concern for civil engineering projects utilizing calcium based soil stabilizers. Therefore, addressing sulfate concentrations in soils is vital to the success of a civil engineering project. Pavement, foundations, tunnels, embankments, pipe lines, etc. are all susceptible to sulfate induced heave if the appropriate conditions and constituents are present. The work presented here within focuses on the soluble sulfate testing completed on six (6) different geologic formations within the Integrated Pipe Line (IPL) alignment of North Texas. The testing and analyses were conducted to identify problematic zones and quantify sulfate values in order to prevent …
Finite Element Modeling Of Prestressed Girder Strengthening Using Fiber Reinforced Polymer And Codal Comparison, Muruganandam Mohanamurthy
Finite Element Modeling Of Prestressed Girder Strengthening Using Fiber Reinforced Polymer And Codal Comparison, Muruganandam Mohanamurthy
Civil Engineering Theses - Archive
Fiber Reinforced Polymer (FRP) composite materials provide effective and potentially economic solution for rehabilitating and upgrading the existing reinforced and precast concrete bridge structures that have suffered deterioration. Each year, there are a significant number of damaged bridges, mainly due to structural failure, reinforcing steel corrosion or vehicle collision. Using FRP materials has many advantages over other strengthening methods. This study consists of reviewing relevant guidelines, codes, standard practices and manufacturer's specifications that deals with FRP strengthening of damaged concrete bridges based on both U.S and international sources. Based on literature review, the available design guidelines are summarized and compared. …
Evaluating The Performance Of Controlled Low Strength Materials (Clsms) Prepared Using Sulfate Spiked High Plasticity Clay, Sadikshya Poudel
Evaluating The Performance Of Controlled Low Strength Materials (Clsms) Prepared Using Sulfate Spiked High Plasticity Clay, Sadikshya Poudel
Civil Engineering Theses - Archive
When large scale civil engineering projects such as Integrated PipeLine (IPL) are to be constructed, several factors play a significant role in the successful completion of the project on time and on budget. With pipeline construction, one of the important tasks is excavation, with excavation comes the hauling of the excess excavated trench material to the disposal site. The hauling of unwanted excavated dirt from the site and bringing in select backfill material that meets the project requirements not only adds to the overall cost of the project but also raises concerns about sustainability. Transport of unwanted excavated materials require …
Leachate Recirculation Modeling Using Vertical Wells In Bioreactor Landfills, Aminollah Ghorbanpourbabakandi
Leachate Recirculation Modeling Using Vertical Wells In Bioreactor Landfills, Aminollah Ghorbanpourbabakandi
Civil Engineering Theses - Archive
Municipal solid waste (MSW) is made up of household and commercial waste. Total MSW generated in USA in 2009 was 243 million tons and 54.3% of this waste generation was landfilled (EPA, 2009). MSW buried in landfills contribute a significant amount of gas (Landfill Gas or LFG) to atmosphere. The landfilled MSW is the third largest methane contributor to the atmosphere.One way to manage the LFG is the concept of bioreactor landfills. A bioreactor landfill is a controlled landfill where liquid and gas conditions are actively managed in order to accelerate or enhance biostabilization of MSW. Biostabilization of MSW is …
Testing And Design Life Analysis Of Polyurea Liner Materials, Siavash Ghasemi-Motlagh
Testing And Design Life Analysis Of Polyurea Liner Materials, Siavash Ghasemi-Motlagh
Civil Engineering Theses - Archive
Certainly, water pipes, as part of an underground infrastructure system, play a key role in maintaining quality of life, health, and wellbeing of human kind. As these potable water pipes reach the end of their useful life, they create high maintenance costs, loss of flow capacity, decreased water quality, and increased dissatisfaction.There are several different pipeline renewal techniques available for different applications, among which linings are most commonly used for the renewal of water pipes. Polyurea is a lining material applied to the interior surface of the deteriorated host pipe using spray-on technique. It is applied to structurally enhance the …
Improving Analysis Of Heavy To Extreme Precipitation Using Conditional Bias-Penalized Optimal Estimation, Ridwan Siddique
Improving Analysis Of Heavy To Extreme Precipitation Using Conditional Bias-Penalized Optimal Estimation, Ridwan Siddique
Civil Engineering Theses - Archive
Precipitation estimation is a very important topic from the societal perspective as heavy precipitation can cause flooding from which loss of lives and damage to properties can occur. In current practice, a number of spatial interpolation techniques are used for precipitation estimation using rain gauge data. Most of them are based on minimizing error variance but none of them consider Type-II conditional bias. As such, the existing techniques work well in the mid ranges of the precipitation distribution but tend to under- and overestimate large and small precipitation amounts, respectively. Conditional bias- penalized kriging (CBPK) adds a penalty term for …
Assessment Of Stress/Volume-Controlled Soil-Water Retention Properties Of Unsaturated Sandy Soils., Hailu Ayalew
Assessment Of Stress/Volume-Controlled Soil-Water Retention Properties Of Unsaturated Sandy Soils., Hailu Ayalew
Civil Engineering Theses - Archive
The main objectives of this work are to determine the effect of net normal stress and volume change on the soil-water retention properties of silty sand and clayey sand soils under stressed/volume-controlled conditions; to model soil-water retention parameters under stress/volume-controlled conditions; and to model the effect of higher net normal stress state on the soil-water retention characteristics of these two test soils based on the experimental test results. In order to investigate the effect of stress/volume change on the soil-water retention characteristics of these two test soils, two test methods were followed: the stress/volume-controlled soil-water characteristic test (Tempe pressure cell …
Improving Productivity Of Tunnel Boring Machines, Nicholas Jencopale
Improving Productivity Of Tunnel Boring Machines, Nicholas Jencopale
Civil Engineering Theses - Archive
Tunneling with tunnel boring machines (TBMs) is one of the most mechanized and sophisticated processes within the construction industry. However, there are risks when venturing down several hundred feet where the conditions cannot be accurately determined in advance. Months and years of planning, engineering, profiling, researching, and scheduling go into a typical tunneling project before any ground breaking event. This thesis will discuss in detail the growing technologies of the tunneling process using tunnel boring machines (TBM). First, some background information on tunneling and the use of a TBM will be provided to introduce the process and the industry being …
Corrosion Potentials Of Lightweight Concrete Wrapped With Fiber Reinforced Polymers (Frp), Eric Goucher
Corrosion Potentials Of Lightweight Concrete Wrapped With Fiber Reinforced Polymers (Frp), Eric Goucher
Civil Engineering Theses - Archive
The purpose of this research was to investigate the effects of Fiber Reinforced Polymer wraps on corrosion protection of lightweight concrete. Many studies have been undertaken for normal density concrete, but there are very few studies regarding lightweight concrete and externally bonded FRP wraps. This experiment involved the use of an accelerated corrosion test to determine the corrosion protection that FRP would afford lightweight concrete, while making a comparison with a similarly proportioned normalweight mix. 42 cylinders were subject to a constant 12 V power from a DC Power Supply while being immersed in a 5% NaCl for a period …
Structural And Material Performance Of Rubberized And Hybrid Concrete Pipes, Mohammad Mohammadagha
Structural And Material Performance Of Rubberized And Hybrid Concrete Pipes, Mohammad Mohammadagha
Civil Engineering Theses - Archive
This study investigates how the combination of steel fiber, crumb rubber, synthetic fiber, and conventional steel cage will improve the ductility of regular concrete pipes and thin-walled semi-rigid concrete pipes. In this study, pipes with four different concrete mixtures were produced and tested: (1) Steel Bar Reinforced Concrete Pipe (SBRCP), (2) Crumb Rubber Reinforced Concrete Pipe (CRRCP), (3) Steel Fiber Reinforced Concrete Pipe (SFRCP), and (4) Synthetic Fiber Reinforced Concrete Pipe (SNFRCP). This study investigates how the variation of the fiber volume fraction and crumb rubber content in concrete mix affects the behavior of pipes with diameters ranging from 24in. …
Ensemble Streamflow Forecasting For The Upper Trinity River Basin In Texas, Manabendra Saharia
Ensemble Streamflow Forecasting For The Upper Trinity River Basin In Texas, Manabendra Saharia
Civil Engineering Theses - Archive
By allowing for routine use of longer-lead quantitative precipitation forecast (QPF) in hydrologic prediction, ensemble forecasting offers hope for extending the lead time for short-range streamflow forecasting. In this work, this potential is assessed by comparatively evaluating ensemble streamflow hindcasts forced by Day 1-3 QPF with those forced by Day 1 QPF for five headwater basins in the Upper Trinity River Basin in North Texas. The hindcasts are generated for a 7-year period of 2004 to 2010 using the Hydrologic Ensemble Forecast Service (HEFS), which operates on the Community Hydrologic Prediction System (CHPS) of the National Weather Service (NWS). HEFS …
The Relation Between Freeway Average Speed And Speed Noise, Bahar Zarin
The Relation Between Freeway Average Speed And Speed Noise, Bahar Zarin
Civil Engineering Theses - Archive
A significant amount of energy could be saved by applying traffic management policies. Many factors affect the fuel consumption rate, and the most important traffic-related ones include variables such as speed, number of stops, the speed noise, and the acceleration noise. Fuel consumption models for both urban and highway traffic are used to evaluate the effect of these factors. Previous literature shows the speed and the acceleration of the individual vehicles as well as the aero-dynamic effects are the most considered parameters in highway fuel consumption models. However, the existing models are based on the average or cruising speed and …
Effect Of Suction On Dynamic Properties Of Unsaturated Soils At Mid- To High-Shear Strain Amplitudes, Alejandro Hernan Pino Bravo
Effect Of Suction On Dynamic Properties Of Unsaturated Soils At Mid- To High-Shear Strain Amplitudes, Alejandro Hernan Pino Bravo
Civil Engineering Theses - Archive
This paper presents the results from an experimental study that has been designed to assess the effect of the suction and net mean stress on the dynamic properties of poorly graded sand with silt subjected to small- to mid-shear strains. The practical implication of this study includes determining the effect on soil stiffness properties of increased matric suction (transpiration of water) at different net mean stresses (or depths) in the field. The engineering analysis of earth structures subjected to static and non-static loading under unsaturated conditions requires knowing the relevant parameters of the soil, such as shear wave velocity, shear …
Lrfd Pullout Resistance Factor Calibration For Soil Nails Incorporating Survival Analysis And Plaxis 2d, Brett Devries
Lrfd Pullout Resistance Factor Calibration For Soil Nails Incorporating Survival Analysis And Plaxis 2d, Brett Devries
Civil Engineering Theses - Archive
The use of soil nail walls (SNWs) in the United States has increased since their introduction in the mid-1970's, to where currently the analysis, design and construction are commonly performed (Lazarte, 2011). These SNW designs were mostly based on ASD methods and LRFD-based methodologies were lacking until the 1998 FHWA manual on SNW design (Byrne, Cotton, Porterfield, Wolschlag and Ueblacker, 1998), which provided uncalibrated resistance factors developed from ASD safety factors. As a result, little improvement was made toward a more efficient design, until fully calibrated LRFD pullout resistance factors were provided in the NCHRP Report 701 (Lazarte, 2011). These …
Enhancing Selective Decomposition Of Ibuprofen Onto Porous Tio₂ Nanoparticles, Abolfazl Zakersalehi
Enhancing Selective Decomposition Of Ibuprofen Onto Porous Tio₂ Nanoparticles, Abolfazl Zakersalehi
Civil Engineering Theses - Archive
Advanced oxidation technologies have gained tremendous attention for water treatment purposes after demonstration of insufficient efficiency of conventional systems for removal of many emerging chemicals of concern. Among AOTs, a TiO2-UV system is one of the most promising approaches due to its green properties and its effectiveness in generation of extremely oxidizing species such as hydroxyl radicals. However it has been demonstrated that non-selectivity of HRs in decomposition of organic compounds results in parallel decomposing of naturally abundant organic matter (NOM) along with toxic target contaminant, which significantly decreases the decomposition rate of target contaminants. Despite a great amount of …
Large Diameter Steel Pipe Field Test Using Controlled Low Strength Material And Staged Construction Modeling Using 3-D Nonlinear Finite Element Analysis, Franciele Bellaver
Large Diameter Steel Pipe Field Test Using Controlled Low Strength Material And Staged Construction Modeling Using 3-D Nonlinear Finite Element Analysis, Franciele Bellaver
Civil Engineering Theses - Archive
Using finite element methods and field tests, an extensive study on selected steel pipes is devised for the Integrated Pipeline Project in Dallas-Fort Worth, Texas. The project integrates Tarrant Regional Water District (TRWD) existing pipelines to the Dallas system along 150 miles. Field test of buried pipes, monitoring the pipe in different trench conditions is extremely valuable in predicting the displacement of the pipe during construction stages and during its lifetime. The field instrumentation monitors the circular displacements and strains of a buried steel pipe with an outside diameter (O.D.) of 84 in. and 0.375 in. thickness in three different …
Performance Evaluation And Finite Element Analysis Of Fiber Reinforced Precast Concrete Underground Structures, Ashley Wilson
Performance Evaluation And Finite Element Analysis Of Fiber Reinforced Precast Concrete Underground Structures, Ashley Wilson
Civil Engineering Theses - Archive
This study aimed at evaluating the performance of BASF Synthetic and Steel fibers as alternative reinforcements in concrete pipes. A total of 93 synthetic fiber and 60 steel fiber reinforced pipes were produced and tested based on the ASTM C497 in order to have a benchmark for comparison with conventionally reinforced concrete pipes. Three production sites with different production equipment were used in different geographical locations in the United States. Standard ASTM C76 diameters of up to 36 in. with "Wall-B" and "Wall-C" were used in this study for both synthetic and steel fibers. Vertical and horizontal load-deformation plots for …
Engineering Behavior Of Lime Treated High Sulfate Soils, Ahmed Hassan Mohamed Gaily
Engineering Behavior Of Lime Treated High Sulfate Soils, Ahmed Hassan Mohamed Gaily
Civil Engineering Theses - Archive
Regardless of increased knowledge and awareness of sulfate heave, the Texas Department of Transportation (TxDOT) continues to experience pavement failures during and immediately after construction on transportation infrastructures intended to last at least 20 years. Failures are predominantly observed in sites where high sulfate soils of 8,000 ppm or higher levels. Many of these failures are attributed to sulfate-induced heave where an expansive mineral called Ettringite is formed from calcium-based stabilizers (lime or cement) reacting with water, clay, and sulfates. The reactions responsible for Ettringite formation are extremely complex which make generalizations concerning the rate and magnitude of heaving in …
Comparative Application Of Two Nanoparticles In Cement Mortar, Vinoth Mohanam
Comparative Application Of Two Nanoparticles In Cement Mortar, Vinoth Mohanam
Civil Engineering Theses - Archive
Carbon Nanotubes (CNTs) and Carbon Nanofibers (CNFs) are two of the most promising advanced materials in the construction industry due to their excellent material properties. In this study, their application in cement mortar is studied comparatively as possible choice for concrete repair. CNT and CNF have very high aspect ratio due to which the Van der Wal forces between the CNT and CNF tend to agglomerate; thus forming bundles. In order to achieve proper dispersion, ultrasonic energy was used to disperse the CNT and CNF in the aqueous solution. The mechanical properties such as compressive strength and flexural strength of …
The Effects Of Climate, Soil, And Vegetation On The Design Of Water Balance Covers For Solid Waste Landfills In Texas, Salman Baig
The Effects Of Climate, Soil, And Vegetation On The Design Of Water Balance Covers For Solid Waste Landfills In Texas, Salman Baig
Civil Engineering Theses - Archive
The purpose of this study is to determine the effects of climate, soil, and vegetation on the design of water balance (WB) covers for solid waste landfills in Texas. This study was conducted using water balance software (UNSAT-H model) that considers unsaturated soil hydraulics and plant water uptake. To date, limited research has been conducted for WB covers in Texas. Texas is located in the central region of the United States and encounters approximately nine distinct 5 inch precipitation increments or ranges, unlike any other state in the United States. Texas includes various climate regions and is a favorable choice …
Effect Of Saline Water On Landfill Gas Generation Of Municipal Solid Waste, Yogavathani Sivanesan
Effect Of Saline Water On Landfill Gas Generation Of Municipal Solid Waste, Yogavathani Sivanesan
Civil Engineering Theses - Archive
The Enhanced Leachate Recirculation (ELR) landfills operation results in rapid waste stabilization, waste decomposition and increased rate of gas generation. However, operating landfill as an ELR landfill requires availability of sufficient amount of fresh water in close proximity to the landfill facility. In coastal regions, where fresh water supplies may be scarce, available saline water may be considered for ELR operation. However, the effects of saline water on the decomposition solid waste and landfill gas generation are unknown and need to be investigated., The objectives of the current research are to investigate the effects of adding and/or recirculating saline water …
Identifying Issues Impacting Productivity Of Box Jacking Projects, Bhaumi Bhavan Chaurasia
Identifying Issues Impacting Productivity Of Box Jacking Projects, Bhaumi Bhavan Chaurasia
Civil Engineering Theses - Archive
Jacking is a trenchless construction technique used for installing underground pipeline system. Jacking method is more widely used for upgrading under capacity culverts and drainage structures under roads and railroad tracks. Also, this method is used for installing underground pipelines such as watermains, sewers etc.in populated and developed urban areas. In this method, culverts (segments) are installed through the ground from an entry shaft to an exit shaft. During the excavation and spoil removal processes, workers are required to be inside the pipe, this is essentially what separates pipe jacking trenchless construction method from microtunneling technology. The minimum recommended diameter …
Effect Of Nano Zero Valent Iron On Degradation Of Municipal Solid Waste In Bioreactor Landfills, Meenakshi Gangopadhyay
Effect Of Nano Zero Valent Iron On Degradation Of Municipal Solid Waste In Bioreactor Landfills, Meenakshi Gangopadhyay
Civil Engineering Theses - Archive
Nanotechnology has substantial potential for reducing contamination, toxicity and overall human health hazards and environmental risks. In recent times, nano zero valent iron has proved to be effective in contaminant reduction and pollution control. Iron is an important micronutrient for the microbes involved in the anaerobic decomposition of solid waste in bioreactor landfills. Landfill leachate sometimes contains toxic compounds which nano zero valent iron has proven to be very effective in removing, particularly chlorinated organics, heavy metals, and odorous sulfides. Iron can also potentially increase landfill methane generation by removing long chain fatty acids and sulfides that inhibit methanogenesis.nZVI materials …
An Investigation Of Pipe Jacking Loads In Trenchless Technology, Saeed Rahjoo
An Investigation Of Pipe Jacking Loads In Trenchless Technology, Saeed Rahjoo
Civil Engineering Theses - Archive
Pipe jacking is a trenchless technology method of installing pipes under existing facilities such as roads and railroads. Predicting jacking forces is important for planning, design, and construction phases of these projects. The jacking forces dictate shaft or pit locations, thrust block or backstop design, jacking equipment, use of intermediate jacking stations, and pipe bearing capacity. Calculating jacking forces depends on several site and project parameters such as soil and site conditions, lubrication, size of overcut, and steering corrections. Excessive jacking forces can damage the pipe and destabilize the drive shaft, which may stop project progress. There are different methods …
Performance Of Large Diameter Polyvinyl Chloride (Pvc) Pipes In Water Applications, Pradip P. Deshmukh
Performance Of Large Diameter Polyvinyl Chloride (Pvc) Pipes In Water Applications, Pradip P. Deshmukh
Civil Engineering Theses - Archive
Polyvinyl chloride (PVC) pipes with diameters greater than 24" make up a small fraction of water utilities. Most of the research done on PVC pipes in water utilities focuses on diameters less than 24". Therefore, this thesis focuses on PVC water main pipelines with a diameter greater than 24" in an attempt to understand their performance in the water management facilities. This thesis had several objectives, such as to evaluate 24" and larger diameter PVC pipes in water transmission and distribution applications, calculate failure rate per hundred miles of PVC pipes at water utilities, categorize age of PVC pipelines with …
Qualitative Evaluation Of Transportation Construction Related Social Costs And Their Impacts On The Local Community, Amanda Ferguson
Qualitative Evaluation Of Transportation Construction Related Social Costs And Their Impacts On The Local Community, Amanda Ferguson
Civil Engineering Theses - Archive
Although construction is valuable after completion, it can cause many disturbances throughout the duration of the project. These negative impacts, such as economic losses and annoyances, which face the community surrounding a construction project, are referred to as social costs. They are the inconveniences that confront the general public and take many forms such as traffic delays and congestion, decreased revenue, increased accidents, and air and noise pollution. Social costs negatively affect the surrounding environment and everyday quality of life. Social costs are often not incorporated into construction design, planning or budgets. This can be attributed to the complexity of …
Application Of Ellipse For Horizontal Alignment, Farzin Maniei
Application Of Ellipse For Horizontal Alignment, Farzin Maniei
Civil Engineering Theses - Archive
In highway design, horizontal alignments provide directional transition of roadways. Three categories of horizontal transition curves are simple circular curves, compound circular curves, and spiral circular curves. Compound and spiral curves, as alternatives to a simple circular curve, are often more costly since they are longer in length and require additional right-of-way. These costs differences are amplified at higher design speed. This study presents calculations associated with using a single elliptical arc in lieu of compound or spiral curves in situations where the use of simple circular curves is not prudent due to driver safety and comfort considerations. The study …
Performance Comparison Of High Density Polyethylene Pipe, Chandan Venkatesh
Performance Comparison Of High Density Polyethylene Pipe, Chandan Venkatesh
Civil Engineering Theses - Archive
The current and forecasted major challenge faced by water utilities is delivering potable water efficiently with minimum loss to end users. Water pipe failure has negative impact not only local communities but also on the nation's economy. The American Water Works Association (AWWA) has estimated that it will cost over $250 billion to replace and renew the nation's water pipes over the next 20 years. According to the 2009 American Society of Civil Engineers (ASCE) Report Card, seven billion gallons of water are lost in this country every day!Every pipe has unique properties with advantages and limitations. During a pipe's …