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Articles 421 - 450 of 677
Full-Text Articles in Civil Engineering
Condition Assessment Of Fiber Reinforced Polymer Strengthening Of Bridge Components, Hemachand Pallempati
Condition Assessment Of Fiber Reinforced Polymer Strengthening Of Bridge Components, Hemachand Pallempati
Civil Engineering Theses - Archive
Fiber Reinforced Polymers (FRP) is a newly developed composite type of material which have many advantages over conventional materials (concrete and steel) like light weight, non-corrosive nature, design flexibility and quick installation. Due to its superior thermo-mechanical properties, it has emerged as one of the best economical method to strengthen and repair reinforced concrete bridges that were damaged each year due to various reasons like structural deterioration over time, fire accidents, corrosion of steel reinforcement and over height vehicle collision. This research aims to evaluate the long term performance of FRP strengthened bridge components with the help of Pull-Off tests. …
Development Of A Database And Selection Model For Optimum Retaining Wall Construction, Cost And Production, Fernando Pizarro Quintanar
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 …
Adsorption Of Metals In Flu-Gas Desulfurization Wastewater By Iron-Impergnated Activated Carbon, Manjira Kudaravalli
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 …
Effects Of Corn Mill Waste On Municipal Solid Waste Degradation In Bioreactor Landfills, Dipta Mitra Joy
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 …
Settlement Analysis Of Drilled Shaft Foundation On Natural And Lime-Treated Compressible Clayey Soil, Abdusemed Kemal Ali
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 …
Variability Of As-Constructed Properties Of Hma And Their Relation To Pay Factors And Rutting Resistance: A Case Study, Rosario Tripiana Martinez
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 …
Evaluation Of The Performance Of Steel Fiber Reinforced Concrete Pipes Produced By Packerhead Method, Abdelaziz Mohsen
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 …
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 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 …
Enhancing Effectiveness Of Aashto Type Prestressed Concrete Bridge Girder Through Fiber Reinforced Polymer Strengthening, Farzia Haque
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 …
Pavement Performance Monitoring Using Dynamic Cone Penetrometer And Geogauge During Construction, Ahmed Nawal Ahsan
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 …
Public Private Partnership Pitfalls In Toll Roads, Mahran Maher Zatar
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 …
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 …
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 …
Comparison Of Deflection Measurement Methods Of Large Diameter Steel Pipes With Control Low Strength Material, Saman Farrokhi Gozarchi
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 …
Comparative Analysis Of Flood Frequency Based On Radar-Based Precipitation Data And Precipitation Trends, Simeon Andrew Benson
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 …
Strength And Stiffness Characteristics Of Lime Stabilized Soil In A Flexible Pavement Design, Andrew James Domke
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 …
Long-Term Effects Of Synthetic Fibers On Concrete Pipes, Sasan Farrokhi Gozarchi
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 …
Transformation Of, In, And By Learning In A Service-Learning Faculty Fellows Program, Mary Cazzell, Shirley Theriot, Joan M. Blakey, Melanie L. Sattler
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 …
Investigation Of An Association Between Childhood Leukemia Incidences And Airports In Texas, Sala. Nanyanzi Senkayi, Melanie L. Sattler, Nancy Rowe, Victoria Chen
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 …
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 …
Stiffness Response Of Chemically Stabilized Sulfate Rich Soil Via Resonant Column Test, Miftah Semane
Stiffness Response Of Chemically Stabilized Sulfate Rich Soil Via Resonant Column Test, Miftah Semane
Civil Engineering Theses - Archive
Stabilization of expansive soils using lime and cement additives have been used by practitioners over the last few years. However, recent heaving and premature pavement failures in lime and cement-treated subgrades containing sulfates led to questioning the validity of calcium based stabilization. When expansive soils containing sulfates are treated with calcium-based stabilizers, the calcium from the stabilizer reacts with soil sulfates and alumina to form the expansive mineral Ettringite.A series of resonant column (RC) tests (ASTM D 4015-92) was conducted on several chemically stabilized specimens of high-plasticity, sulfate-rich expansive clay from Sherman, Texas. Test results were used to assess 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 …
Non-Destructive Sasw Evaluation Of Controlled Low Strength Material As A Pipeline Bedding Material, Rathna Phanindra Mothkuri
Non-Destructive Sasw Evaluation Of Controlled Low Strength Material As A Pipeline Bedding Material, Rathna Phanindra Mothkuri
Civil Engineering Theses - Archive
Evaluation of stiffness properties of subsurface soil layers provides vital insight into the performance of a geotechnical entity. Stiffness properties can be determined by both field and laboratory tests. Owing to their advantages over laboratory tests, the field tests are often given priority. non-destructive seismic method Spectral Analysis of Surface Waves (SASW) has been implemented in the current research to investigate the stiffness properties of buried materials.The SASW technique works on the principle of wave propagation. The surface wave velocity obtained through the test is used to determine the shear modulus, and thus the stiffness, of the geotechnical entity. In …
Sensible Heat Balance And Heat-Pulse Method Applicability To In Situ Soil-Water Evaporation, Andrew C. Trautz, Kathleen M. Smits, Paul Schulte, Tissa H. Illangasekare
Sensible Heat Balance And Heat-Pulse Method Applicability To In Situ Soil-Water Evaporation, Andrew C. Trautz, Kathleen M. Smits, Paul Schulte, Tissa H. Illangasekare
Civil Engineering Faculty Publications - Archive
A combined heat-pulse and sensible heat balance method can be used to determine evaporation using temperature measurements and thermal property estimations. The objective of this study was to investigate the applicability of the combined heat-pulse and sensible heat balance method by comparing laboratory experimental data to both an analytical and a multiphase heat and mass transfer model. A bench-scale laboratory experiment was performed to measure soil thermal and hydraulic properties at fine spatial and temporal resolutions. Comparisons of experimental and numerical results confirmed the applicability of the heat-pulse and sensible heat balance methods to determine evaporation rates. Results showed close …