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2014

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Articles 601 - 630 of 735

Full-Text Articles in Civil Engineering

Development Of A Database And Selection Model For Optimum Retaining Wall Construction, Cost And Production, Fernando Pizarro Quintanar Jan 2014

Development Of A Database And Selection Model For Optimum Retaining Wall Construction, Cost And Production, Fernando Pizarro Quintanar

Civil Engineering Theses - Archive

Retaining walls are earth retention elements that result essential in the majority of the construction projects for the overall project performance, as well as its budget and schedule. These elements constitute a key role in urban development, industrial facilities and civil projects as evidenced by the more than 170 million of square feet being constructed per year in the United States. The current market conditions, as well as the advances in the technology and knowledge associated to these elements, determine the need for accurate decision making processes that lead to optimum retaining walls in terms of applicability, cost and production …

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Adsorption Of Metals In Flu-Gas Desulfurization Wastewater By Iron-Impergnated Activated Carbon, Manjira Kudaravalli Jan 2014

Adsorption Of Metals In Flu-Gas Desulfurization Wastewater By Iron-Impergnated Activated Carbon, Manjira Kudaravalli

Civil Engineering Theses - Archive

The combustion of coal releases flue gases into the atmosphere. The flue gas has very high concentrations of Sox. Flue gas desulfurization technologies are installed in almost all the coal fired power plants to treat the flue gas and to reduce the sulfur dioxide emissions. Sulfur dioxide emissions cause serious impacts on environment and also the human health. Studies on the FGD technologies reveal that, wet FGD technology is used more extensively to treat the Flue gas, as it cost efficient and also the reduction efficiencies are very high. Despite the treatment process available for treating the FGD wastewater, achieving …

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Effects Of Corn Mill Waste On Municipal Solid Waste Degradation In Bioreactor Landfills, Dipta Mitra Joy Jan 2014

Effects Of Corn Mill Waste On Municipal Solid Waste Degradation In Bioreactor Landfills, Dipta Mitra Joy

Civil Engineering Theses - Archive

The Enhanced Leachate Recirculation (ELR) landfills is a sustainable disposal system of waste which facilitates faster degradation of waste, more gas generation in a short period of time, rapid waste stabilization along with energy recovery. The decomposition of waste largely depends on heterogeneity of landfilled waste composition, leachate recirculation, rainfall, and several other factors like recirculate leachate composition, ambient temperature etc. Various researches have been conducted on landfill behavior subjected to various waste composition and conditions.Corn Mill Waste, a crop residue and a refuse from corn milling industries, is a major source of crop waste in US. A significant amount …

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Settlement Analysis Of Drilled Shaft Foundation On Natural And Lime-Treated Compressible Clayey Soil, Abdusemed Kemal Ali Jan 2014

Settlement Analysis Of Drilled Shaft Foundation On Natural And Lime-Treated Compressible Clayey Soil, Abdusemed Kemal Ali

Civil Engineering Theses - Archive

Drilled shaft foundations are primarily used to support structures such as bridge piers, buildings, and transmission towers. The main advantage of a drilled shaft foundation is that it transfers loads to the stronger subsoil layers or rock strata lying underneath, giving maximum bearing capacity to the overlying structure.This goal of this research is to load bearing capacity of a drilled shaft on both treated and untreated compressible soil. In this study, both analytical and numerical studies were conducted to investigate the effect of lime treatment on the settlement of the drilled shaft. Extensive literature study was conducted on analysis of …

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Variability Of As-Constructed Properties Of Hma And Their Relation To Pay Factors And Rutting Resistance: A Case Study, Rosario Tripiana Martinez Jan 2014

Variability Of As-Constructed Properties Of Hma And Their Relation To Pay Factors And Rutting Resistance: A Case Study, Rosario Tripiana Martinez

Civil Engineering Theses - Archive

During the last decade, Texas has under gone a huge reconstruction of its major and strategic highways in order to improve transportation and prepare for future population and traffic growth. The population is estimated to increase by 50% for 2035 for the North Texas Area.Some of those highway reconstruction projects have asphalt pavements, and they utilize significant quantities of asphalt concrete. This study compiles the test results of As-Constructed properties for asphalt mixes for four different projects built in Texas. This data was statistically analyzed to obtain information on the variability of As-Constructed properties and study the effect of the …

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Evaluation Of The Performance Of Steel Fiber Reinforced Concrete Pipes Produced By Packerhead Method, Abdelaziz Mohsen Jan 2014

Evaluation Of The Performance Of Steel Fiber Reinforced Concrete Pipes Produced By Packerhead Method, Abdelaziz Mohsen

Civil Engineering Theses - Archive

This research aimed at evaluating the use of Dramix RC 65/35 CN steel fiber as an alternative to the conventional reinforcement in concrete pipes. The performance of steel fiber reinforced concrete pipes produced by Packerhead pipe production machine was evaluated through an experimental testing of steel fiber reinforced concrete pipes with diameters from 18 to 36 in and different steel fiber dosages.Three-edge bearing tests were carried out according to the ASTM C497 to determine the strength class of each case of pipes. For more detailed image of the tested pipes' performance, load-deflection data were acquired and plots were made to …

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Rainfall Induced Distress In Low Volume Pavements, Mahsa Hedayati Jan 2014

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 …

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Development Of A Simplified Analytical Method To Estimate The Seismic Response Of Reinforced Concrete Frames With Solid Masonry Infills, Austin Reese Jan 2014

Development Of A Simplified Analytical Method To Estimate The Seismic Response Of Reinforced Concrete Frames With Solid Masonry Infills, Austin Reese

Civil Engineering Theses - Archive

This thesis discusses the analysis of the lateral force-vs-drift relation of reinforced concrete (RC) frames with masonry infill panels under in-plane lateral loads. Such structures have been the topic of several studies due to their recurring catastrophic failures during seismic events. Due to the large number of variables that can affect their seismic performance and lead to various possible failure mechanisms there is no widely accepted method for the assessment of the structural behavior of infilled frames under seismic loads. A parametric study was performed here using detailed analytical models which provided insight to the influence of the various design …

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Enhancing Effectiveness Of Aashto Type Prestressed Concrete Bridge Girder Through Fiber Reinforced Polymer Strengthening, Farzia Haque Jan 2014

Enhancing Effectiveness Of Aashto Type Prestressed Concrete Bridge Girder Through Fiber Reinforced Polymer Strengthening, Farzia Haque

Civil Engineering Theses - Archive

Fiber-reinforced polymers (FRP) are newly used materials by structuralengineers compared to concrete, steel, and wood. One area in which FRP is being used more and more is the strengthening of structurally deficient concrete bridges. FRP strengthening of the bridge girder improves flexural, shear, corrosion, seismic, and impact resistance. ACI 440 committee report outlined design procedure for flexure, shear, axial force, and combined axial and bending forces based on the available research, which are considered to be conservative and also pointed out the areas that still require research. Besides experimental, analytical, and field tests finite element analysis of FRP strengthened structural …

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Evaluation Of Physico-Mechanical Properties Of Clayey Soils Using Electrical Resistivity Imaging Technique, Golam Kibria Jan 2014

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 …

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Pavement Performance Monitoring Using Dynamic Cone Penetrometer And Geogauge During Construction, Ahmed Nawal Ahsan Jan 2014

Pavement Performance Monitoring Using Dynamic Cone Penetrometer And Geogauge During Construction, Ahmed Nawal Ahsan

Civil Engineering Theses - Archive

Proper design life of road network system requires adequate quality control measures during the construction process to ensure proper material quality and sufficient strength in between the materials. Laboratory tests are often time consuming and sometimes, are not practical while the construction work is going on, in-situ techniques can efficiently evaluate the material properties through simple and less time consuming procedures. Dynamic Cone Penetrometer and Geogauge can play a vital role as an in-situ testing equipment because both have the potential to measure the change in material properties through field tests being performed in the field. Both in-situ techniques was …

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Development And Validation Of The Structural Health Evaluation (SheTm) Program, Steven Worley Jan 2014

Development And Validation Of The Structural Health Evaluation (SheTm) Program, Steven Worley

Electronic Theses and Dissertations

No abstract provided.

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Shear Behavior Of High Strength Self-Consolidating Concrete In Nu Bridge Girders, Alexander Michael Griffin Jan 2014

Shear Behavior Of High Strength Self-Consolidating Concrete In Nu Bridge Girders, Alexander Michael Griffin

Masters Theses

"As the nation's infrastructure continues to age, advanced concrete technologies have been developed to both reduce a structure's costs and increase its life expectancy. Since the early 1990's, self-consolidating concrete (SCC) has been one of these technologies. Many, however, have been reluctant to implement SCC in highway girders due to the mixture constituents. One of these concerns is the reduced content and size of the coarse aggregate. These differences in the concrete potentially hinder SCC's mechanical properties and shear resistance. Additionally, for high strength concretes (HSC) with weaker aggregates, shear cracks tend to propagate through the coarse aggregate, reducing the …

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Study On Surface Permeability Of Concrete Under Immersion, Jun Liu, Feng Xing, Biqin Dong, Hongyan Ma, Dong Pan Jan 2014

Study On Surface Permeability Of Concrete Under Immersion, Jun Liu, Feng Xing, Biqin Dong, Hongyan Ma, Dong Pan

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this paper, concrete specimens are immersed in ultrapure water, to study the evolutions of surface permeability, pore structure and paste microstructure following the prolonging of immersion period. According to the results, after 30-day immersion, the surface permeability of concrete becomes higher as compared with the value before immersion. However, further immersion makes the surface permeability decrease, so that the value measured after 150-day immersion is only half that measured after 30-day immersion. The early increase in surface permeability should be mainly attributed to the leaching of calcium hydroxide, while the later decrease to the refinement of pore structure due …

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Testing And Strengthening Bridge Connections, Christopher Higgins, Peter Dusicka, Michael Scott Jan 2014

Testing And Strengthening Bridge Connections, Christopher Higgins, Peter Dusicka, Michael Scott

TREC Project Briefs

Researchers evaluate and improve the strength of gusset plate connections, essential pieces in bridge design that can fail due to buckling.

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Public Private Partnership Pitfalls In Toll Roads, Mahran Maher Zatar Jan 2014

Public Private Partnership Pitfalls In Toll Roads, Mahran Maher Zatar

Civil Engineering Theses - Archive

Public-Private Partnership (PPP) has been one of the most effective concepts in developing infrastructure projects. By bringing in creative skills and management efficiency from business practice, private companies can potentially improve efficiency and productivity in implementation of major capital projects and provide an effective approach to meet project objectives. The main idea behind the partnership in toll roads delivery is putting together the strengths of both public and private sectors in order to provide services in the most cost-effective manner, on time, and with the highest quality. However, the criteria on which governments judge the "success" of PPP projects is …

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Development Of Linear Regression Model For Predicting Water Quality Parameters From Anaerobic Treatment Of Vinasse, Shammi Rahman Jan 2014

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 …

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An Investigation Of Durability And Reliability Of Hdpe Pipe For Large Diameter Water Transmission Applications, Divyashree Jan 2014

An Investigation Of Durability And Reliability Of Hdpe Pipe For Large Diameter Water Transmission Applications, Divyashree

Civil Engineering Theses - Archive

The drinking water infrastructure in the North America requires a durable and reliable water transmission pipe material. Thus, it is important to study pipe performance, so that water utilities can benefit from cost-effective and efficient pipe installations and longer design life. All pipe materials deteriorate overtime and every pipe has unique properties with advantages and limitations. During a pipe's life cycle, failures occur due to numerous factors such as age, loading conditions, environmental conditions, installation quality, manufacturing procedures, operation and maintenance strategies and so on. The fatigue performance under cyclic loading in conducted, since very limited information is available on …

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Comparison Of Deflection Measurement Methods Of Large Diameter Steel Pipes With Control Low Strength Material, Saman Farrokhi Gozarchi Jan 2014

Comparison Of Deflection Measurement Methods Of Large Diameter Steel Pipes With Control Low Strength Material, Saman Farrokhi Gozarchi

Civil Engineering Theses - Archive

This study investigates the structural integrity of large diameter (108 inch) steel pipes with mortar lining embedded with Controlled Low Strength Material (CLSM) during installation. Field tests were carried out in the prove-out section of line J which is a 2 mile (3.21 km) section of an Integrated Pipeline network (IPL) that will ultimately run a length of 150 mile (241.4 km) from Lake Palestine to Lake Benbrook. The prove-out is a section of line J that was used for experimental research for the use of CLSM as an embedment material and calibrate Finite Element Method (FEM) model for the …

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Comparative Analysis Of Flood Frequency Based On Radar-Based Precipitation Data And Precipitation Trends, Simeon Andrew Benson Jan 2014

Comparative Analysis Of Flood Frequency Based On Radar-Based Precipitation Data And Precipitation Trends, Simeon Andrew Benson

Civil Engineering Theses - Archive

This study utilizes radar-based precipitation data from the National Weather Service West Gulf River Forecast Center to extract the depth-area-duration relationships via the U.S. Army Corps of Engineers' software HEC-MetVue. Extreme storms from 1997-2013 were analyzed to determine the characteristics for synthetic design storms. Design storms of 10, 25, 50 and 100 year return periods were developed and simulated using the U.S. Army Corps of Engineers' hydrologic modeling tool, HEC-HMS. Finally, flood frequency analysis using the existing method was carried out for comparison and hydrologic impact assessment. The depth-area-duration curves produced were converted to areal-reduction factors for comparison with Technical …

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Strength And Stiffness Characteristics Of Lime Stabilized Soil In A Flexible Pavement Design, Andrew James Domke Jan 2014

Strength And Stiffness Characteristics Of Lime Stabilized Soil In A Flexible Pavement Design, Andrew James Domke

Civil Engineering Theses - Archive

Lime treatment has proven to be a useful tool for stabilizing expansive soils. Expansive soils cause major damage to flexible and rigid pavements every year, since seasonal changes in soil moisture creates cyclical changes in the forces acting on a pavement. The use of lime to stabilize soil can reduce the soil's swell potential and add strength and stiffness to a pavement's subgrade. Due to the improved physical properties, lime stabilized soil (LSS) can be considered as part of the structural pavement layers. Utilizing LSS as a subbase in the pavement structure can reduce the thickness of the more expensive …

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Long-Term Effects Of Synthetic Fibers On Concrete Pipes, Sasan Farrokhi Gozarchi Jan 2014

Long-Term Effects Of Synthetic Fibers On Concrete Pipes, Sasan Farrokhi Gozarchi

Civil Engineering Theses - Archive

The studies undertaken by this research were to evaluate the long-term performance and durability of synthetic fiber-reinforced concrete pipes. The target long-term performance is for 9000 hours. Two sets of pipes 8 ft. (2400 mm) long with inside diameters of 24 in. (600 mm) and 36 in. (1200 mm) were manufactured, with a wall thickness of 3 and 4 in., respectively. The pipes were produced based on ASTM C76, for a Class III type with a Wall B. The two set of pipes included RCP's (as control) and SYN-FRCP's. The SYN-FRCP's had several fiber dosages ranging from 6 lb/yd3 (3.5 …

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Characterization Of Dynamic Structures Using Parametric And Non-Parametric System Identification Methods, Ayad Al Rumaithi Jan 2014

Characterization Of Dynamic Structures Using Parametric And Non-Parametric System Identification Methods, Ayad Al Rumaithi

Electronic Theses and Dissertations

The effects of soil-foundation-structure (SFS) interaction and extreme loading on structural behaviors are important issues in structural dynamics. System identification is an important technique to characterize linear and nonlinear dynamic structures. The identification methods are usually classified into the parametric and non-parametric approaches based on how to model dynamic systems. The objective of this study is to characterize the dynamic behaviors of two realistic civil engineering structures in SFS configuration and subjected to impact loading by comparing different parametric and non-parametric identification results. First, SFS building models were studied to investigate the effects of the foundation types on the structural …

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Structural Health Monitoring Using Novel Sensing Technologies And Data Analysis Methods, Seyedmasoud Malekzadeh Jan 2014

Structural Health Monitoring Using Novel Sensing Technologies And Data Analysis Methods, Seyedmasoud Malekzadeh

Electronic Theses and Dissertations

The main objective of this research is to explore, investigate and develop the new data analysis techniques along with novel sensing technologies for structural health monitoring applications. The study has three main parts. First, a systematic comparative evaluation of some of the most common and promising methods is carried out along with a combined method proposed in this study for mitigating drawbacks of some of the techniques. Secondly, nonparametric methods are evaluated on a real life movable bridge. Finally, a hybrid approach for non-parametric and parametric method is proposed and demonstrated for more in depth understanding of the structural performance. …

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Equity And Fairness In Transport Planning: The State Of Play, Sarah Rock, Aoife Ahern Prof., Brian Caulfield Dr. Jan 2014

Equity And Fairness In Transport Planning: The State Of Play, Sarah Rock, Aoife Ahern Prof., Brian Caulfield Dr.

Conference Papers

This paper explores the concept of equity, or fairness, in transport. As a pillar of sustainable development, social equity is an important objective of transport planning. The provision of transport infrastructure can have significant equity impacts on society through the distribution of costs and benefits. In recent years, there has been an increase in research interest in transportation related equity issues. The paper outlines the primary theoretical traditions that relate to equity and transport equity, and how equity concerns are currently addressed and evaluated in academia and in practice. Recent research has attempted to establish stronger principles from which to …

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Alternative Funding Mechanisms For State Transportation Systems In Predominantly Rural States, John E. Anderson, Eric Thompson Jan 2014

Alternative Funding Mechanisms For State Transportation Systems In Predominantly Rural States, John E. Anderson, Eric Thompson

Bureau of Business Research Publications

The Transportation Research Board of the National Academies has identified a number of research needs related to alternative transportation finance systems. Alternatives are needed because motor fuels taxes are proving to be insufficient to fund operation and maintenance costs of the transportation system. The long-term trend is likely to be continuing use of motor fuel taxes, supplemented by, or transitioning to, use-based fees. Current research in progress in this area is focused on designing variable fees that will internalize congestion externalities in urban areas. These approaches are particularly well suited to highly urbanized areas, but other approaches may be required …

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Transformation Of, In, And By Learning In A Service-Learning Faculty Fellows Program, Mary Cazzell, Shirley Theriot, Joan M. Blakey, Melanie L. Sattler Jan 2014

Transformation Of, In, And By Learning In A Service-Learning Faculty Fellows Program, Mary Cazzell, Shirley Theriot, Joan M. Blakey, Melanie L. Sattler

Civil Engineering Faculty Publications - Archive

Transformative learning is the most desired core outcome in adult education. The qualitative study examined critical reflections for professional transformation related to development and implementation of service-learning courses or projects from four university faculty members during enrollment in a Service-Learning Faculty Fellows program and post-servicelearning implementation. Reflective questions related to faculty perceptions of student learning, service-learning as pedagogy, and their own learning— transformation of, in, and by learning, respectively. Content analyses of faculty reflections resulted in three categories of transformation based on three preservice-learning and three post-servicelearning descriptive themes: (1) transformation of student learning from anticipatory integration to conflicts between …

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Investigation Of An Association Between Childhood Leukemia Incidences And Airports In Texas, Sala. Nanyanzi Senkayi, Melanie L. Sattler, Nancy Rowe, Victoria Chen Jan 2014

Investigation Of An Association Between Childhood Leukemia Incidences And Airports In Texas, Sala. Nanyanzi Senkayi, Melanie L. Sattler, Nancy Rowe, Victoria Chen

Civil Engineering Faculty Publications - Archive

As worldwide demand for air travel increases, emissions from airports will likely also increase. Airport emissions pose a concern due to lack of information about their quantity and impacts on human health and the environment. This research aimed to address the question of whether there is an association between childhood leukemia cases and airport emissions in Texas. Rather than looking at the impacts of a single airport on the surrounding community, this study looks at all airports in the state of Texas, and 2 134 incidences of childhood leukemia (children age 9 and under) state–wide over a 10–year period. The …

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Effect Of Enhanced Leachate Recirculated (Elr) Landfill Operation And Gas Extraction On Greenhouse Gas Emission, Sonia Samir Jan 2014

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 …

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Estimation Of Optimum Compaction Level For Bioreactor Landfill Operation, Dipak Tiwari Jan 2014

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 …

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