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Articles 6631 - 6660 of 11810
Full-Text Articles in Engineering
A Refined Approach To Identifying And Quantifying Clay And Non -Clay Minerals In Expansive Soils, Spoorthi Reballi
A Refined Approach To Identifying And Quantifying Clay And Non -Clay Minerals In Expansive Soils, Spoorthi Reballi
Civil Engineering Theses - Archive
Expansive soils exhibit substantial swelling and shrinkage due to moisture fluctuations. Predicting this volume change behavior of expansive soils has been a major challenge to the engineers in the past few years. One of the factors which play a vital role in understanding the behavior of the expansive soils is mineralogy. Chittoori (2008) had developed three models to quantify the clay minerals using Microsoft Excel Solver, Regression Equations and Artificial Neural networks. The major assumption is that the soil has only three mineral Montmorillonite, Kaolinite and Illite. But the amorphous contents like quartz and feldspar were not taken in to …
Comparison Of Prestressed Concrete Girders With Debonded Strands And Harped Strands, Carmen Diaz-Caneja Nieto
Comparison Of Prestressed Concrete Girders With Debonded Strands And Harped Strands, Carmen Diaz-Caneja Nieto
Civil Engineering Theses - Archive
TxDOT standards follow a design that uses depressed strands for the prestressed concrete I-Girders. A new design criteria using debonded strands for prestressed concrete girders that is widely used in Europe is being introduced in Texas. This new design has been proven to be effective and faster to construct since the strands don't need to be harped. The Lyndon B. Johnson (LBJ) Express construction project was located on I-35 and I-635 in North Dallas Texas and required placement of approximately 7,000 girders to complete this extensive project. A typical girder utilized in this project is the Tx54 with a span …
The Impact Of Lime Dosage On Odor Reduction Of Biosolids, Arash Abri
The Impact Of Lime Dosage On Odor Reduction Of Biosolids, Arash Abri
Civil Engineering Theses - Archive
The amount of boisolids production is increasing due to developing cities and the mitigation of biosolids odorants is a key role to have a successful biosolids land application program. The objective of this study is to investigate the effect of lime stabilization on odor reduction of bio-solids and determine the optimum percentage of lime for each major odor compound and the overall target lime dose in terms of priority and importance of odorants. the Village Creek Water Reclamation Facility (VCWRF) was chosen to supply limed dewatered solids because of having complaints about the odor of biosolids in neighborhood. 5%, 10%, …
Group Resistance Of Recycled Plastic Pin In Sustainable Slope Stabilization, Mohammad Rezaul Haque Bhuiyan
Group Resistance Of Recycled Plastic Pin In Sustainable Slope Stabilization, Mohammad Rezaul Haque Bhuiyan
Civil Engineering Theses - Archive
Slope failure is a common phenomenon in areas with slope constructed on high plasticity clay and shallow slope failure is predominant in North Texas. The cumulative maintenance cost of minor slides is equal or greater than major landslides. But, cost associated with post failure maintenance can be reduced significantly if an appropriate stabilization method is adopted. Thus, selection of appropriate and economically viable slope stabilization method has got great importance for the geotechnical engineers. Recently, a new approach of shallow slope stabilization technique is introduced using Recycled Plastic Pin (RPP). RPP used in shallow slope stabilization should pass beyond the …
Role Of Coarse Soil Fraction On Resilient Moduli Properties Of Clayey Soil, Chatuphat Savigamin
Role Of Coarse Soil Fraction On Resilient Moduli Properties Of Clayey Soil, Chatuphat Savigamin
Civil Engineering Theses - Archive
As one of the major methods of soil stabilization used in the present, mechanical stabilization improves a native soil by admixing a coarse and/or fine material. This method of soil stabilization aims to reach a composition in which coarser particles form the skeleton and the surrounding space is filled with fine grains. As a result, higher soil strength can be achieved. To study the soil strength improvement behavior, resilient modulus and unconfined compressive strength are used as evaluation parameters in this research. Since the present research focuses on subgrade soils, Dallas clay was selected as a reference clayey soil representing …
Comparison Of The Installation Of Strand With Steel Bar Tendons In Anchored Drilled Shaft Wall, Inigo Azofra Arrizabalaga
Comparison Of The Installation Of Strand With Steel Bar Tendons In Anchored Drilled Shaft Wall, Inigo Azofra Arrizabalaga
Civil Engineering Theses - Archive
Anchored drilled shaft walls are common in construction nowadays in the U.S. The use of either strand tendons or steel bar tendons as anchors in construction is approved. However, there is no information from a construction standpoint, of what type of tendon fits better depending on the field conditions or the project requirements. Nor is there any study reflecting the construction process and sequence of this type of retaining wall depending on the type of tendon. This research will evaluate different consequences of the selection of the type of tendon. It will analyze the design aspects, construction scheduling, construction costs, …
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 …
Development And Validation Of The Structural Health Evaluation (SheTm) Program, Steven Worley
Development And Validation Of The Structural Health Evaluation (SheTm) Program, Steven Worley
Electronic Theses and Dissertations
No abstract provided.
Study On Surface Permeability Of Concrete Under Immersion, Jun Liu, Feng Xing, Biqin Dong, Hongyan Ma, Dong Pan
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 …
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 …
Context-Aware Mobile Augmented Reality Visualization In Construction Engineering Education, Arezoo Shirazi
Context-Aware Mobile Augmented Reality Visualization In Construction Engineering Education, Arezoo Shirazi
Electronic Theses and Dissertations
Recent studies suggest that the number of students pursuing science, technology, engineering, and mathematics (STEM) degrees has been generally decreasing. An extensive body of research cites the lack of motivation and engagement in the learning process as a major underlying reason of this decline. It has been discussed that if properly implemented, instructional technology can enhance student engagement and the quality of learning. Therefore, the main goal of this research is to implement and assess effectiveness of augmented reality (AR)-based pedagogical tools on student learning. For this purpose, two sets of experiments were designed and implemented in two different construction …
Characterization Of Dynamic Structures Using Parametric And Non-Parametric System Identification Methods, Ayad Al Rumaithi
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 …
Structural Health Monitoring Using Novel Sensing Technologies And Data Analysis Methods, Seyedmasoud Malekzadeh
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. …
Equity And Fairness In Transport Planning: The State Of Play, Sarah Rock, Aoife Ahern Prof., Brian Caulfield Dr.
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 …