Categorization And Experimental Evaluation Of Anchorage Systems For Fiber-Reinforced Polymer Laminates Bonded To Reinforced Concrete Structures,
2011
Missouri University of Science and Technology
Categorization And Experimental Evaluation Of Anchorage Systems For Fiber-Reinforced Polymer Laminates Bonded To Reinforced Concrete Structures, Stephen V. Grelle
Masters Theses
"While externally-bonded fiber-reinforced polymer (FRP) composites are commonly used for the strengthening of structurally deficient reinforced concrete (RC) members, the topic of anchoring FRP to concrete to achieve higher design strengths has not been addressed. Many innovative systems have been developed to anchor FRP to concrete, but the research involving these anchorage systems is not centralized and is therefore difficult to access. Additionally, systematic testing procedures for evaluating the strength of an anchorage system have not been widely used. To aid in the organization of anchorage system research and facilitate a better understanding of anchorage system behavior, a categorization system …
Laboratory Studies Of Compatibility Of Tamper Detection Materials With Improvised Explosive Device Crater Repairs,
2011
Missouri University of Science and Technology
Laboratory Studies Of Compatibility Of Tamper Detection Materials With Improvised Explosive Device Crater Repairs, Levi Anthony Smith
Masters Theses
"Past methods for road repairs of craters caused by improvised explosive devices (IEDs) on main supply routes (MSRs) and alternative supply routes (ASRs) in Iraq and Afghanistan have been problematic. Traditional temporary and permanent solutions have proven deficient by being easily penetrable or by exposing troops for long periods of time. The use of a pre-blended rapid hardening cementitious material for lED crater repair has solved issues such as quick placement of the repair and high strength of the repair within an hour of placement. However, there are still issues with IEDs being hidden in repairs tampered by or replicated …
Modeling Extreme Traffic Loading On Bridges Using Kernel Density Estimators,
2011
University College Dublin
Modeling Extreme Traffic Loading On Bridges Using Kernel Density Estimators, Cathal Leahy, Eugene J. Obrien, Bernard Enright
Conference papers
Kernel density estimators are a non-parametric method of estimating the probability density function of sample data. In this paper, the method is applied to find characteristic maximum daily truck weights on highway bridges. The results are then compared with the conventional approach
Monitoring And Improving The Effectiveness Of Quality Control And Quality Assurance In Road Construction At Al-Ain Municipality,
2011
United Arab Emirates University
Monitoring And Improving The Effectiveness Of Quality Control And Quality Assurance In Road Construction At Al-Ain Municipality, Mohammed Muftah Sultan Al Aryani
Theses
A good roads network has an important bearing on the economic growth of the country. Construction of quality roads, which is considered a primary objective of any highway agencies and contractors, requires concerted efforts on many fronts. Over the past several years, agencies have been working with the construction industry to implement Quality Assurance/Quality Control activities (QA/QC) in an effort to improve the quality of highway construction. They are used as a mean to describe the materials, workmanship, and other general requirements for the project that the highway agencies expect from the contractors. Good specifications should be easy to understand …
Installation And Performance Evaluation Of Coaxial Cable Sensors For Crack And Corrosion Detection,
2011
Missouri University of Science and Technology
Installation And Performance Evaluation Of Coaxial Cable Sensors For Crack And Corrosion Detection, Iana Muchaidze
Masters Theses
"Even under service loads, reinforced concrete (RC) structures can develop cracks that result in excessive deflection of the structures and provide passages for moisture to corrode steel reinforcement. It is thus critical to develop a simple, cost-effective tool for real-time crack monitoring and associated corrosion detection that may affect the engineering maintenance of RC structures. The objectives of this study include: (1) to develop a die-cut manufacturing process of coaxial cables with spiral outer conductors, (2) to quantify the sensing properties of a miniaturized topology-based crack sensor, (3) to investigate the effectiveness of various sensor installation procedures in RC applications, …
Bond Strength Of High-Volume Fly Ash Concrete,
2011
Missouri University of Science and Technology
Bond Strength Of High-Volume Fly Ash Concrete, Michael Hayse Wolfe
Masters Theses
"Concrete is the most consumed man-made material in the world. Unfortunately, due to the production of cement, concrete has a large carbon footprint. Replacement of cement with fly ash, an industrial waste product, offers a sustainable alternative. The goal of this research was to explore the feasibility of using high-volume fly ash (HVFA) concrete for structural applications by testing the material's reinforcement bond properties. A series of pull-out tests and beam splice tests were performed on specimens with a 70 percent fly ash replacement of cement and then compared to identical tests performed on control specimens cast from a 100 …
Driven Pile Load Test Data For Load And Resistance Factor Design In Missouri,
2011
Missouri University of Science and Technology
Driven Pile Load Test Data For Load And Resistance Factor Design In Missouri, Joseph Ronson Cravens
Masters Theses
"The Missouri Department of Transportation (MoDOT) has recently migrated from allowable stress design (ASD) to load and resistance factor design (LRFD) of driven piles. This transition was initiated when the Federal Highway Administration (FHWA) issued a policy stating that all new bridge designs shall be designed in accordance with the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications to eliminate the difference in design methodologies for bridge superstructures and bridge substructures. However, the resistance factors for driven piles specified in the AASHTO LRFD specifications are based on nationwide pile data, consisting of a wide range …
Impact Of Signal Timing Information On Safety And Efficiency Of Signalized Intersections,
2011
University of Nebraska at Lincoln
Impact Of Signal Timing Information On Safety And Efficiency Of Signalized Intersections, Anuj Sharma
Department of Civil and Environmental Engineering: Faculty Publications
Signalized intersections are provided in traffic networks to improve the safety and efficiency of vehicular and pedestrian movement. There are various measures under education, enforcement and engineering headings that are being attempted to improve safety and efficiency of operations at a signalized intersection. Provision of signal countdown timer, a timer showing the remaining red and green time in a phase, is one such measure and is commonly adopted in India. However, studies on effects of countdown timer under Indian traffic conditions are very scarce. Traffic heterogeneity and lack of lane discipline makes transferability of models developed in other countries (with …
Role Of Information On Probability Of Traffic Conflict On The Onset Of Yellow,
2011
University of Nebraska - Lincoln
Role Of Information On Probability Of Traffic Conflict On The Onset Of Yellow, Nathaniel P. Burnett, Anuj Sharma
Department of Civil and Environmental Engineering: Faculty Publications
This paper examines the effect of information provided to drivers through advance warning flashers (AWFs) on driver’s probability of conflict at the onset of yellow at a high-speed intersection. AWFs are specifically designed to minimize the number of vehicles trapped in their respective dilemma zones at the onset of yellow. A probit modeling technique was used to establish dilemma zone boundaries. Based on the dilemma zone boundaries probability of a perceived conflict curves was computed and compared against actual conflicts observed at each of the studied intersections. The comparison between the actual and theoretical probability of conflict curves generated a …
Role Of Information On Probability Of Traffic Conflict On The Onset Of Yellow,
2011
University of Nebraska - Lincoln
Role Of Information On Probability Of Traffic Conflict On The Onset Of Yellow, Nathaniel P. Burnett, Anuj Sharma
Department of Civil and Environmental Engineering: Faculty Publications
This paper examines the effect of information provided to drivers through advance warning flashers (AWFs) on driver’s probability of conflict at the onset of yellow at a high-speed intersection. AWFs are specifically designed to minimize the number of vehicles trapped in their respective dilemma zones at the onset of yellow. A probit modeling technique was used to establish dilemma zone boundaries. Based on the dilemma zone boundaries probability of a perceived conflict curves was computed and compared against actual conflicts observed at each of the studied intersections. The comparison between the actual and theoretical probability of conflict curves generated a …
Robust Statistical Methods For Non-Normal Quality Assurance Data Analysis In Transportation Projects,
2011
University of Kentucky
Robust Statistical Methods For Non-Normal Quality Assurance Data Analysis In Transportation Projects, Mohammad Moin Uddin
University of Kentucky Doctoral Dissertations
The American Association of Highway and Transportation Officials (AASHTO) and Federal Highway Administration (FHWA) require the use of the statistically based quality assurance (QA) specifications for construction materials. As a result, many of the state highway agencies (SHAs) have implemented the use of a QA specification for highway construction. For these statistically based QA specifications, quality characteristics of most construction materials are assumed normally distributed, however, the normality assumption can be violated in several forms. Distribution of data can be skewed, kurtosis induced, or bimodal. If the process shows evidence of a significant departure from normality, then the quality measures …
Steel Beams Strengthened With Ultra High Modulus Cfrp Laminates,
2011
University of Kentucky
Steel Beams Strengthened With Ultra High Modulus Cfrp Laminates, Nisal Abheetha Peiris
University of Kentucky Doctoral Dissertations
Advanced composites have become one of the most popular methods of repairing and/or strengthening civil infrastructure in the past couple of decades. While the use of Fiber Reinforced Polymer laminates and sheets for the repair and strengthening of reinforced concrete structures is well established, research on the application of FRP composites to steel structures has been limited. The use of FRP material for the repair and rehabilitation of steel members has numerous benefits over the traditional methods of bolting or welding of steel plates. Carbon FRPs (CFRPs) have been preferred over other FRP material for strengthening of steel structures since …
Bs News January/February,
2011
Technological University Dublin
The Effect Of Loose Mix Aging On The Performance Properties Of Warm Asphalts,
2011
University of Kentucky
The Effect Of Loose Mix Aging On The Performance Properties Of Warm Asphalts, Thomas Martin Clements
University of Kentucky Master's Theses
Recent improvements in warm mix asphalt technologies have spurred an aggressive adoption of these new practices within the asphalt paving industry. Concerns have arisen among federal and state agencies about the effects of this line of products on the performance of asphalt pavements. An investigation of the effects of lowering mixing, aging and compactions temperatures while varying the loose mix aging time was performed. Hamburg Wheel Tracking, Flow Number, Dynamic Modulus and Fracture Energy testing were used to evaluate mechanistic properties of the materials.
Particulate Organic Carbon Fate And Transport In A Lowland, Temperate Watershed,
2011
University of Kentucky
Particulate Organic Carbon Fate And Transport In A Lowland, Temperate Watershed, William Isaac Ford Iii
University of Kentucky Master's Theses
Small lowland agricultural systems promote conditions where benthic biological communities can thrive. These biogeochemical processes have significant impacts on terrestrial ecosystem processes including POC flux and fate, nutrient balances, water quality budges, and aquatic biological functioning. Limited information is available on coupled biological and hydrologic processes in fluvial systems. This study investigates the mixture of biological and hydrologic processes in the benthic layer in order to understand POC cycling in the South Elkhorn system. Further, comprehensive modeling of POC flux in lowland systems has not been performed previously and the behavior of potentially controlling variables, such as hydrologic forcing and …
Postcyclic Behavior Of Low-Plasticity Silt,
2011
Missouri University of Science and Technology
Postcyclic Behavior Of Low-Plasticity Silt, Shuying Wang
Doctoral Dissertations
"Liquefaction of low-plasticity silt has been reported during earthquakes in the recent past. Excess pore pressure builds up due to the dynamic loading and then dissipates. The postcyclic behavior of low-plasticity silt was investigated in this research for materials obtained from the Mississippi River Valley. The experimental program involved specimen preparation using a slurry consolidation approach. A special technique was developed for specimen movement, reducing the testing program time by half. Both static and cyclic triaxial tests were conducted to confirm the ability to prepare replica specimens. In order to characterize the monotonic behavior, triaxial tests were conducted to determine …
Micropile Response To Combined Loading,
2011
Missouri University of Science and Technology
Micropile Response To Combined Loading, Kyle Allen Kershaw
Doctoral Dissertations
"The familiarity and acceptance of micropiles by engineers, contractors, and owners has greatly expanded in recent years such that they are routinely considered on many projects. However, research regarding the behavior of micropiles has lagged behind. The goal of this research project was to address some of the fundamental gaps that were not addressed in engineering practice and require further study and testing. Specifically, this research studied the behavior of micropile foundations subjected to simultaneous axial and lateral (combined) loading, including an assessment of the impact of axial load on lateral behavior of micropiles. This research project consisted of three …
Design Mentoring Tool,
2011
Purdue University - Main Campus
Design Mentoring Tool, Bob Mccullouch, Walter Land
JTRP Technical Reports
In 2004 a design engineer on-line mentoring tool was developed and implemented The purpose of the tool was to assist senior engineers mentoring new engineers to the INDOT design process and improve their technical competency. This approach saves senior engineers time while developing a consistent mentoring approach and standardizing technical knowledge in road and bridge design. It is a self-guided tool that utilizes multi-media and web-based technologies, trains engineers in the design process and provides resources to use for developing plans and specifications. Available resources include INDOT design practices, design standards, design memos, specification and construction standards, procedures, and check …
A Method For Calibration Of Speed-Flow Curves In Hcm 2010 And Determination Of Highway Capacity,
2011
Missouri University of Science and Technology
A Method For Calibration Of Speed-Flow Curves In Hcm 2010 And Determination Of Highway Capacity, Seyed Hadii Khazraee Khoshroozi
Masters Theses
"This study proposes a method for calibration of speed-flow curves in a format suggested by the Highway Capacity Manual (HCM) 2010 and applies it to two sites in Missouri: a work zone on I-44 around Pacific, and a basic freeway segment on I-270 in St. Louis. The three-regime model proposed is based on the two-regime (free-flow and transition) uncongested relationship suggested by the HCM 2010, complemented with a third regime representing congested conditions. Further, this study proposes a systematic approach based on regression analysis to determine capacity i.e., the break-point (intersection) between the transition and congested regimes. The proposed method …
"Long" Carbon Fiber Reinforced Concrete For Impact And Blast Resistance,
2011
Missouri University of Science and Technology
"Long" Carbon Fiber Reinforced Concrete For Impact And Blast Resistance, Benjamin Paul Gliha
Masters Theses
"One of the most commonly used materials for protective structures and construction is traditional reinforced concrete. However, in a blast, conventional reinforced concrete (RC) is susceptible to significant spalling (small to medium size chunks of concrete detaching from the original member). The force of the blast turns spalled concrete into projectiles, resulting in secondary fragmentation and the majority of loss of life. Furthermore, the concrete debris makes for difficult and uncertain footing. Both phenomena endanger personnel and complicate post-blast recovery efforts. A very promising but barely explored change to conventional RC construction is the addition of "long" carbon fibers (fibers …
