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Articles 391 - 420 of 677
Full-Text Articles in Civil Engineering
Concrete Chloride Ingress: Effect Of Frp Type, Layers And Epoxy, Vinod Reddy Kamagani Kuntla
Concrete Chloride Ingress: Effect Of Frp Type, Layers And Epoxy, Vinod Reddy Kamagani Kuntla
Civil Engineering Theses - Archive
The main objective of this research is to reduce the chloride ingress in concrete due to the effects of Fiber Reinforced Polymer (FRP) type, layers and Epoxy. It has been established from previous researches that FRP wrap used to retrofit concrete structures offer a high resistance to chemical solutions but in this case study different variables like FRP, layers of FRP and only epoxy are used to know the resistance of concrete structures to chemical solutions. The ACI 318-11 Code allows for a reduction of clear cover depth if an equivalent clear cover depth can be establish. The FRP used …
Development And Validation Of Tdr Based Sensors For Thermal Conductivity And Soil Suction Measurements, Nan Zhang
Civil Engineering Dissertations - Archive
Simultaneous measurement of soil thermal conductivity, moisture content, dry density and soil suction is a challenging issue and very important to the design of geothermal related structures such as geothermal energy piles (GEP), ground source heat pump (GSHP) systems borehole thermal energy storage (BTES) systems, etc. The measurement of these properties is mainly done in laboratory conditions which can be time consuming. Hence, an attempt is made in this research to determine a new field sensor that can provide these properties about time frame. TDR technique had been used successfully to measure soil moisture content and dry density by analyzing …
Performance Of Full-Scale Ultra-High Performance Fiber-Reinforced Concrete Column Subjected To Extreme Earthquake-Type Loading And Effect Of Surface Preparation On The Cohesion And Friction Factors Of The Aashto Interface Shear Equation, Guillermo Palacios
Civil Engineering Theses - Archive
Buildings in areas of high seismicity may be subjected to large axial stresses as well as severe earthquake loading. In order to protect the integrity of these buildings, concrete columns must possess high compressive strength and adequate ductility. While the use of high strength concrete (HSC) may appear as an attractive alternative and can reduce the section size of first story columns, its increase in strength leads to an increase in brittleness compared to that of normal strength concrete. For that reason, HSC requires a large amount of transverse reinforcement to maintain adequate ductility, which leads to severe congestion in …
Predicting Horizontal Pressure In 2-Stage Mse Structures, Thomas Patrick Taylor
Predicting Horizontal Pressure In 2-Stage Mse Structures, Thomas Patrick Taylor
Civil Engineering Theses - Archive
Mechanically Stabilized Earth (MSE) structures have been successfully used in the United States as embankment support structures for heavy highway transportation projects since 1972. On project sites that have poor foundations and where large settlements are predicated a variation of MSE called 2-Stage MSE is utilized. As the name suggests, 2-Stage structures are constructed in two stages. Stage-1 consists of constructing a flexible faced MSE structure and Stage-2 consists of attaching a veneer to the face of the Stage-1 structure. The Stage-1 and Stage-2 structures are separated by a short distance forming a cavity that is filled with granular material. …
Experimental Evaluation Of Frp Strengthened Concrete Bridge Girders, Rakesh B. Jayanna
Experimental Evaluation Of Frp Strengthened Concrete Bridge Girders, Rakesh B. Jayanna
Civil Engineering Theses - Archive
This report presents the details of research study on the use of Carbon Fiber Reinforced Polymers (CFRP) sheets to strengthen the Pre-stressed concrete TxDOT Tx-28 bridge girders in flexure and shear. Four girders were subjected to destructive test in this research. First girder as control specimen without any CFRP applied on it, Second and third girders were flexural strengthened for one and two layers of CFRP and the forth girder is shear strengthened with one layer CFRP. Experimental phases along with the comparison of test results in terms of flexural and shear capacity of bridge girders, strains and deflections are …
A Unified Swcc-Clay Mineralogy Based Framework For Predicting Swell Behavior Of Expansive Soils, Alejandro Hernan Pino Bravo
A Unified Swcc-Clay Mineralogy Based Framework For Predicting Swell Behavior Of Expansive Soils, Alejandro Hernan Pino Bravo
Civil Engineering Dissertations - Archive
Expansive soils are spread over different climatic zones around the world with varying mineralogical content and microstructure, making the soil to absorb moisture between their mineral layers and therefore undergo volume changes. This behavior generates swell and shrinkage surface movements which affect the integrity of infrastructure built on them. A practice currently employed correlates swell-shrink behavior to soil index parameters, however, variable soil mineralogy limits this approach, which generates poor soil swell characterization. Thus, characterizing efforts must be emphasized on identification of real parameters governing the swell/shrink behavior, such as mineralogy, variation of suction with moisture content and pore distribution. …
The Strength Of Horizontal Shear Reinforcement With Limited Development, Regina Nyambura Waweru
The Strength Of Horizontal Shear Reinforcement With Limited Development, Regina Nyambura Waweru
Civil Engineering Dissertations - Archive
In order for the composite action between the precast beam and the cast-in-place deck to be effective, sufficient horizontal (interface) shear strength needs to be provided at the interface of the two concrete elements to prevent slip. Horizontal shear strength is provided by three main components: the protrusions on the crack faces (cohesion/aggregate interlock), friction between the faces resulting from the normal compressive stress, and the dowel action of the reinforcing bars. AASHTO LRFD equation assumes that all reinforcement crossing the interface would be fully developed on both sides of the interface at ultimate shear strength. This study examines if …
Repair Of Impact-Damaged Prestressed Concrete Bridge Girder Using Glass Frp Rebar, Maria Angeles De La Flor Montero
Repair Of Impact-Damaged Prestressed Concrete Bridge Girder Using Glass Frp Rebar, Maria Angeles De La Flor Montero
Civil Engineering Theses - Archive
Overpass girders are risked by the impact of the traffic, over height vehicle, travelling under the structure, creating a hazard for the drivers over and under the bridge.When a bridge girder is damaged the repair solution adopted has to meet the following criteria:- Safety. The repaired structure has to provide a minimum level of service to guarantee the safety of the traffic during the life of the structure. - Repair time. To minimize the risk and the inconvenience for the traffic the repair time has to be minimum.- Economy. The adopted solution has not only to fulfill the previous requirements, …
Enhanced Viscoelastic Modeling Of Hot Mix Asphalt, Tito P. Nyamuhokya
Enhanced Viscoelastic Modeling Of Hot Mix Asphalt, Tito P. Nyamuhokya
Civil Engineering Dissertations - Archive
The primary objective of this research is to investigate the relationships between Compressive (CDM) and Tensile Dynamic Moduli (TDM) of Hot Mix Asphalt (HMA) and develop a material model that predicts tensile dynamic modulus from known compressive dynamic modulus. Moreover, the research develops an enhanced visco-hyper-elastic Finite element model that incorporates both CDM and computed TDM to predict the structural response of a perpetual pavement structure subjected to wheel loading. In the laboratory, the Compressive and Tensile Dynamic Modulus parallel to the direction of compaction and Tensile dynamic modulus perpendicular to the direction of compaction were determined at different temperature …
Effect Of Termite Gut Microbe Tav5 On Methane Production From Municipal Solid Waste Degradation, Hoda Rahimi
Effect Of Termite Gut Microbe Tav5 On Methane Production From Municipal Solid Waste Degradation, Hoda Rahimi
Civil Engineering Theses - Archive
Methane from anaerobic processes is being increasingly utilized as an alternative energy source in developed countries, via large projects that extract methane from landfills or wastewater treatment plants. Anaerobic degradation of organic material (biomass) involves decomposition by bacteria under humid conditions without any oxygen. Organic carbon deposited in landfills is converted by microbes to carbon dioxide (CO2) and methane (CH4). If the methane is not captured, it contributes to climate change (25 times more effectively than CO2 on a per-mass basis). If the methane is captured, it can be used as a renewable energy resource. Lignocellulose comprises a significant portion …
A New Technique For The Estimation Of The Elastic Moduli Of Pavement Layers From Light Weight Deflectometer Data, Nickey Akbariyeh
A New Technique For The Estimation Of The Elastic Moduli Of Pavement Layers From Light Weight Deflectometer Data, Nickey Akbariyeh
Civil Engineering Theses - Archive
This study developed a method to estimate the elastic moduli of a flexible pavement system from Light Weight Deflectometer deflection data. The forward method (simple equations) can be easily programmed into the data acquisition device of the Light Weight Deflectometers. The equations can be of a primary assistance in the evaluation of the flexible pavement structures. The method is simple and it eliminates the need for the backcalculation procedure after the LWD test. The pavement systems considered in this study are composed of 2 to 4 inches of the asphalt concrete wearing layer and 4 to 8 inches of compacted …
Potential Applicability Of Stress Wave Velocity Method On Pavement Base Materials As A Non-Destructive Testing Technique, Masrur Mahedi
Potential Applicability Of Stress Wave Velocity Method On Pavement Base Materials As A Non-Destructive Testing Technique, Masrur Mahedi
Civil Engineering Theses - Archive
Aggregates derived from natural sources have been used traditionally as the pavement base materials. But in recent times, the extraction of these natural aggregates has be-come more labor intensive and costly due to resource depletion and environmental concerns. Thus, the uses of recycled aggregates as the supplementary of natural aggregates are increasing considerably in pavement construction. Use of recycled aggregates such as recycled crushed concrete (RCA) and recycled asphalt pavement (RAP) reduces the rate of natural resource depletion, construction debris and cost. Although recycled aggregates could be used as a viable alternative of conventional base materials, strength characteristics and product …
Fatigue Life Assessment Of A Critical Field Welded Connection On A Temporary Railway Bridge Span, Curtis Heinsen
Fatigue Life Assessment Of A Critical Field Welded Connection On A Temporary Railway Bridge Span, Curtis Heinsen
Civil Engineering Theses - Archive
There is a need in the railway industry for a flexible solution to the problem of service interruptions due to impacts on railway bridges from highway and other vehicle traffic. One such solution is the placement of a temporary span that can be used on multiple substructure types and configurations and can be quickly assembled from a kit of available parts. In order to minimize the erection time and maximize the span flexibility such a span could utilize welded connections in place of bolted connections throughout the structure. These connections would be vulnerable to fatigue failure which has been shown …
Factors Influencing The Microbial Calcium Carbonate Precipitation Performance In Sands, Naga Venkata Prasanna Kumar Velpuri
Factors Influencing The Microbial Calcium Carbonate Precipitation Performance In Sands, Naga Venkata Prasanna Kumar Velpuri
Civil Engineering Theses - Archive
Microbial induced calcium carbonate precipitation is relatively a new ground improvement technique for geotechnical engineers. This technique uses non-pathogenic organisms that are found naturally in soil environment to cement sand particles together at their contacts. This thesis describes the influence of various factors on cementation of MICP-treated soil catalyzed by bacteria and urease from an experimental study. Some of these factors include number of nutrient cycles, concentration of calcium chloride solutions, number of injections and particle size. Finally the objective of my research is to have a better understanding about the effects of various parameters on the biological cementation. Ottawa …
Testing, Analysis And Classification Of No-Dig Manhole Rehabilitation Materials, Alimohammad Entezarmahdi
Testing, Analysis And Classification Of No-Dig Manhole Rehabilitation Materials, Alimohammad Entezarmahdi
Civil Engineering Theses - Archive
Gravity flow wastewater collection systems are comprised of sewer pipes and manholes. Failure of a manhole may have catastrophic consequences such as developing a sinkhole in the street and roadway, and at a minimum, wastewater flow will be blocked and stream of the manhole will backup causing a sanitary sewer overflow (SSO). Improving structural conditions of a manhole is critical to minimize these types of failures. This thesis considers the impact of several lining materials including cement mortar, epoxy, polyurethane, cured-in-place composites, and a multi- layer structure material on increasing the structural capabilities of deteriorated manholes. The tasks included in …
Development Of The Duplicate Shear Test For Asphalt Mixtures, Mohammadreza Khajeh Hosseini
Development Of The Duplicate Shear Test For Asphalt Mixtures, Mohammadreza Khajeh Hosseini
Civil Engineering Theses - Archive
Permanent shear deformation is the main cause of rutting in asphalt concrete layers. Therefore, the determination of the shear properties of asphalt mixtures is helpful for predicting the rutting in asphalt pavement structures and for the identification of poor performing asphalt mixtures. The objective of this study was to develop a new test device to replicate similar loading conditions and constraints of the Superpave Shear Tester (SST). The new device, named the Double Shear Tester (DST), determines the mechanical average of the shear properties and responses of two specimens instead of that of a single specimen as in the SST …
Is Service-Learning Worth It?: A Mixed-Methods Study Of Faculty’S Service-Learning Experiences, Joan M. Blakey, Shirley Theriot, Mary Cazzell, Melanie L. Sattler
Is Service-Learning Worth It?: A Mixed-Methods Study Of Faculty’S Service-Learning Experiences, Joan M. Blakey, Shirley Theriot, Mary Cazzell, Melanie L. Sattler
Civil Engineering Faculty Publications - Archive
Service-learning benefits students, communities, institutions of higher learning, and faculty. Most studies have focused on the impact of service-learning on students; however, there is a dearth of mixed-methods research examining faculty use of service-learning. Using a two-phase, exploratory, mixed-methods design, the purpose of this study was to understand the factors that influenced 24 faculty fellows’ engagement with service-learning. The qualitative component examined four faculty’s in-depth experiences with service-learning to understand the meaning they assigned to those experiences and to identify key themes that affected engagement. The quantitative phase of the study explored the extent to which 20 additional faculty fellows’ …
Development Of A Simplified Flexible Pavement Design Protocol For New York State Department Of Transportation Based On Aashto Me Pavement Design Guide, Ali Qays Abdullah
Development Of A Simplified Flexible Pavement Design Protocol For New York State Department Of Transportation Based On Aashto Me Pavement Design Guide, Ali Qays Abdullah
Civil Engineering Dissertations - Archive
New York State Department of Transportation (NYSDOT) has used the AASHTO 1993 Design Guide for the design of new flexible pavement structures for more than three decades. The AASHTO 1993 Guide is based on the empirical relationships developed for the data collected in the AASHO Road Test in the early 1960's. A newer pavement design method, called the Mechanistic-Empirical Pavement Design Guide (MEPDG) was developed by the National Cooperative Highway Research Program to provide a more efficient and accurate design method and based on sound engineering principles. The MEPDG models have been incorporated in the AASHTOWare Pavement ME 2.1 software …
Properties Of Microcement Mortar With Nano Particles, Narasimha Reddy Alimeneti
Properties Of Microcement Mortar With Nano Particles, Narasimha Reddy Alimeneti
Civil Engineering Theses - Archive
Carbon nanotubes (CNT) and Carbon nanofibers (CNF) are one of the toughest and stiffest materials in the world presently with extreme properties yet to be discovered in terms of elastic modulus and tensile strength. Due to the advanced properties of these materials they are being used in almost all fields of science at nanolevel and are being used in construction industry recently for improvement of material properties. Microcement is fine ground cement which as half the particle size of ordinary Portland cement. In this research the behavior of cement mortar of micro cement with the addition of nanoparticles is studied.Due …
Effect Of Preformed Chloramines And Chlorine To Ammonia Ratio On The Formation Of N-Nitrosodimethylamine (Ndma) In Trwd East Texas Raw Water Delivery System, Khidir Hamad
Civil Engineering Theses - Archive
Tarrant Regional Water District (TRWD) pumps untreated raw water from Richland Chambers and Cedar Creek reservoirs in East Texas to provide water to several customer cities including Arlington and Fort Worth. TRWD adds chloramines to the pipeline to combat biofilm growth, that reduces pipeline capacity and increases pumping costs, and to control zebra mussels, that clog intake structure screens and the pump wet wells. However, addition of chloramines leads to the formation of N-nitrosodimethylamine (NDMA), a potent carcinogen, by reaction of chloramines with nitrogenous organic precursors possibly present in the raw water. NDMA formation presents a challenge to TRWD because …
Fate Of Bulk Hypochlorite Solutions In Two Water Treatment Facilities, Anna Breytus
Fate Of Bulk Hypochlorite Solutions In Two Water Treatment Facilities, Anna Breytus
Civil Engineering Theses - Archive
Measurement of oxyhalides in various strength hypochlorite solutions has been an issue of importance in the last decade, especially in view of the current aim of Homeland Security to reduce the usage of chlorine gas. Hypochlorite solutions have a potential of introducing disinfection by-products when used for water treatment. Previous works have shown the possibility of high levels of chlorate and perchlorate in high strength hypochlorite solutions. Perchlorate is an endocrine disruptor that inhibits iodide intake by the thyroid, thus reducing the production of essential thyroid hormones. Chlorate also has several adverse effects on the blood and thyroid systems. Perchlorate …
Quantitative Non-Destructive Evaluation Of Rebar Diameter And Corrosion Damage In Concrete Using Ground Penetrating Radar, Md Istiaque Hasan
Quantitative Non-Destructive Evaluation Of Rebar Diameter And Corrosion Damage In Concrete Using Ground Penetrating Radar, Md Istiaque Hasan
Civil Engineering Dissertations - Archive
The purpose of this study is to develop new methods for quantitative estimation of rebar diameter and loss of area of rebar due to corrosion using Ground Penetrating Radar (GPR). The existing methods of determining the rebar diameter using GPR are not accurate and the existing methods for evaluating corrosion using GPR are qualitative. The study included in this dissertation uses a 2.6 GHz antenna to estimate the diameter of rebar using two different approaches. The approaches use digital image processing of GPR ragargrams and maximum normalized reflection amplitude form the rebar to estimate the diameter. A novel method to …
Discrete Element Modeling Of Geogrid Reinforced Granular Media, Asheesh Pradhan
Discrete Element Modeling Of Geogrid Reinforced Granular Media, Asheesh Pradhan
Civil Engineering Dissertations - Archive
Geogrids have proven to be economical solution in improving ground conditions for construction in foundations, retaining walls, railway tracks, and pavements. Hence researchers have started studying the geogrid reinforcement in detail to understand the working of geogrid and parameters affecting it. Following the advent of faster computers and efficient algorithms researcher have started using discrete element method (DEM) to study geogrid reinforcement since DEM provides particulate level of interaction and understanding and is the closest resemblance of the physical phenomenon. However, the research works are widely spread lacking comprehensive review of factors that can affect such models. This research studies …
Study Of The Effect Of Wind Speed On Evaporation From Soil Through Integrated Modeling Of The Atmospheric Boundary Layer And Shallow Subsurface, Hossein Davarzani, Kathleen Smits, Ryan M. T Tolene, Tissa Illangasekare
Study Of The Effect Of Wind Speed On Evaporation From Soil Through Integrated Modeling Of The Atmospheric Boundary Layer And Shallow Subsurface, Hossein Davarzani, Kathleen Smits, Ryan M. T Tolene, Tissa Illangasekare
Civil Engineering Faculty Publications - Archive
In an effort to develop methods based on integrating the subsurface to the atmospheric boundary layer to estimate evaporation, we developed a model based on the coupling of Navier-Stokes free flow and Darcy flow in porous medium. The model was tested using experimental data to study the effect of wind speed on evaporation. The model consists of the coupled equations of mass conservation for two-phase flow in porous medium with single-phase flow in the free-flow domain under nonisothermal, nonequilibrium phase change conditions. In this model, the evaporation rate and soil surface temperature and relative humidity at the interface come directly …
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, …