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Articles 151 - 180 of 331
Full-Text Articles in Civil and Environmental Engineering
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, …
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 …
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 …
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 …
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 …
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 …