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Effects Of Surface Treatments On National Bridge Inventory Condition Ratings For Concrete Bridge Decks In Utah, John Taani De Leon 2018 Brigham Young University

Effects Of Surface Treatments On National Bridge Inventory Condition Ratings For Concrete Bridge Decks In Utah, John Taani De Leon

All Theses and Dissertations

Although the application of surface treatments on bridge decks is expected to positively impact bridge deck condition, the effectiveness of specific surface treatments on extending bridge deck life has not yet been quantified on Utah bridge decks. Therefore, the objectives of this research were to develop and analyze deterioration curves for bare concrete bridge decks and decks with specific treatments commonly used in Utah. The scope of this study was determined by the types and extent of electronically available data, including selected static inventory information; maintenance, rehabilitation, and reconstruction histories; and National Bridge Inventory (NBI) condition ratings for the bridge ...


Reinforcing Bar Splice Performance In Masonry With Self-Consolidating Grout, Aaron Brent Roper 2018 Brigham Young University

Reinforcing Bar Splice Performance In Masonry With Self-Consolidating Grout, Aaron Brent Roper

All Theses and Dissertations

The use of self-consolidating grout in reinforced masonry construction provides various advantages such as reduced labor, faster construction, decreased noise pollution and better structural response. This is a relatively new building material however, and little research on self-consolidating grout's structural properties has been conducted. The purpose of this study was to analyze the performance or bond capacity of steel reinforcing bar splices in masonry with self-consolidating grout. Twelve masonry panels approximately 40 in. wide and 32 in. tall consisting of Type S mortar and concrete masonry units grouted with self-consolidating grout and No. 5 steel reinforcing bars were constructed ...


Measuring And Calculating Current Atmospheric Phosphorous And Nitrogen Loadings On Utah Lake Using Field Samples, Laboratory Methods, And Statistical Analysis: Implication For Water Quality Issues, Jacob Milton Olsen 2018 Brigham Young University

Measuring And Calculating Current Atmospheric Phosphorous And Nitrogen Loadings On Utah Lake Using Field Samples, Laboratory Methods, And Statistical Analysis: Implication For Water Quality Issues, Jacob Milton Olsen

All Theses and Dissertations

Atmospheric nutrient loading and transport though precipitation and dry deposition is one of the least understood yet one of the most important pathways of nutrient transport into many lakes. These nutrients, phosphorus and nitrogen, are essential for aquatic life and often play major roles in algae blooms that occur in lakes and reservoirs. Often heavy algal growth intensifies a variety of water quality problems. Utah Lake may be even more susceptible to atmospheric deposition due to its large surface area to volume ratio and proximity to Great Basin dust sources. In this study, eight months of atmospheric deposition data were ...


Chloride Concentration And Blow-Through Analysis For Concrete Bridge Decks Rehabilitated Using Hydro-Demolition, Elizabeth Ashleigh Roper 2018 Brigham Young University

Chloride Concentration And Blow-Through Analysis For Concrete Bridge Decks Rehabilitated Using Hydro-Demolition, Elizabeth Ashleigh Roper

All Theses and Dissertations

The objectives of this research were 1) to investigate the effects of hydrodemolition treatment timing on chloride concentration profiles in concrete bridge decks for depths of concrete removal below the top mat of reinforcing steel and 2) to investigate factors that influence the occurrence of blow-throughs in concrete bridge decks when hydrodemolition is used. The research results are intended to provide engineers with guidance about the latest timing of hydrodemolition that can maintain a chloride concentration level below 2.0 lb of chloride per cubic yard of concrete at the levels of both the top and bottom mats of reinforcing ...


Artificial Recharge Of Groundwater As A Management Tool For The Kabul Basin, Afghanistan, Mohammad Farid Masoom 2018 Louisiana State University

Artificial Recharge Of Groundwater As A Management Tool For The Kabul Basin, Afghanistan, Mohammad Farid Masoom

LSU Master's Theses

Decades of war and political instability, consecutive droughts, population increase and displacement, caused serious infrastructural damages to water resources of Afghanistan. The main source of water supply for people in Afghanistan is groundwater. However, over-exploitation of groundwater has led to groundwater level declines in most parts of the country. Kabul, the largest city of Afghanistan, is the capital city with a population of 4.5 million and the fifth fastest-growing city in the world. The city has observed groundwater level declines of 5-10 meters (m) since 1980. Decline of about 30 m has also been observed in one of the ...


Simplified Approach For Structural Evaluation Of Flexible Pavements At The Network Level, Karthikeyan Loganathan 2018 University of Texas at Tyler

Simplified Approach For Structural Evaluation Of Flexible Pavements At The Network Level, Karthikeyan Loganathan

Civil Engineering Theses

Currently, there is no simple procedure available to identify structurally weak pavement sections using Falling Weight Deflectometer (FWD) data at the network level (e.g., city, state or province). A simple method is needed to determine the structural condition of pavement sections that can be directly implemented and automated in the current pavement databases. The method needs to be simple enough to be used with a network level FWD database for the purpose of numerically ranking pavement sections at the network level from good to poor. Backcalculation has been utilized to obtain layer moduli and determine overlay (new added surface ...


Construction Techniques For Electrically Conductive Heated Pavement Systems, Hesham Abdualla, Halil Ceylan, Kristen S. Cetin, Sunghwan Kim, Peter C. Taylor, Mani Mina, Bora Cetin, Kasthurirangan Gopalakrishnan, Sajed Sadati 2018 Iowa State University

Construction Techniques For Electrically Conductive Heated Pavement Systems, Hesham Abdualla, Halil Ceylan, Kristen S. Cetin, Sunghwan Kim, Peter C. Taylor, Mani Mina, Bora Cetin, Kasthurirangan Gopalakrishnan, Sajed Sadati

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Ice and snow accumulation on airport paved surfaces has the potential to cause fatal accidents and monetary loss due to flight delays and cancellations. Traditional de-icing methods involving the application of chemicals or salt and employing large machines can create negative environmental and structural impact on airport infrastructure systems. These methods are also considered to be labor intensive and a safety hazard, especially in congested areas such as aprons. Heated pavement systems using electrically conductive concrete (ECON) have been proposed as a promising alternative technology for preventing ice accumulation and mitigating the adverse effects of using traditional snow removal methods ...


Hydrology And Phosphorus Model For Agricultural Watershed: Swat Simulation Of Discharge And Nutrient Flux In The Medway Creek Watershed, Omar EL Abusanina 2018 The University of Western Ontario

Hydrology And Phosphorus Model For Agricultural Watershed: Swat Simulation Of Discharge And Nutrient Flux In The Medway Creek Watershed, Omar El Abusanina

Electronic Thesis and Dissertation Repository

High nutrient concentrations in surface water have been a serious concern that impacts water quality and ecology. High Phosphorus levels in Medway Creek indicate the presence of a pollution source in the watershed that needs to be identified and quantified. To investigate this issue, the Soil and Water Assessment Tool (SWAT) program has been used in this study with the Geographic Information System (GIS) to model the Medway Creek watershed and assess stream flow and nutrient flux. In this research, the SWAT model has been built, calibrated, and validated using two independent observed data sets to evaluate the SWAT efficiency ...


Operational Impact Of Shadow Evacuation On Regional Road Networks During Short-Notice Emergency Evacuations, Efe Emre Tuncer 2018 Louisiana State University

Operational Impact Of Shadow Evacuation On Regional Road Networks During Short-Notice Emergency Evacuations, Efe Emre Tuncer

LSU Master's Theses

As part of evacuation planning, development of effective tactical and operational strategies are essential to safely and efficiently mobilize the public away from the threat. Evacuations are classified by the time between notification and the anticipated arrival of the threat which can be categorized as short, or no-notice emergencies. Emergencies involve the computation of the time required to evacuate the area of risk, which is the time to clear a radius of up to about 10-miles around the nuclear power plant, known as the emergency planning zone (EPZ). These evacuation time estimates (ETE) also account for the evacuation of the ...


Capacitance-Based Wireless Strain Sensor Development, Jong-Hyun Jeong, Jian Xu, Hongki Jo, Jian Li, Xiangxiong Kong, William Collins, Caroline Bennett, Simon Laflamme 2018 University of Arizona

Capacitance-Based Wireless Strain Sensor Development, Jong-Hyun Jeong, Jian Xu, Hongki Jo, Jian Li, Xiangxiong Kong, William Collins, Caroline Bennett, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

A capacitance based large-area electronics strain sensor, termed soft elastomeric capacitor (SEC) has shown various advantages in infrastructure sensing. The ability to cover large area enables to reflect mesoscale structural deformation, highly stretchable, easy to fabricate and low-cost feature allow full-scale field application for civil structure. As continuing efforts to realize full-scale civil infrastructure monitoring, in this study, new sensor board has been developed to implement the capacitive strain sensing capability into wireless sensor networks. The SEC has extremely low-level capacitance changes as responses to structural deformation; hence it requires high-gain and low-noise performance. For these requirements, AC (alternating current ...


Durability Assessment Of Soft Elastomeric Capacitor Skin For Shm Of Wind Turbine Blades, Austin Downey, Anna Laura Pisello, Elena Fortunati, Claudia Fabiani, Francesca Luzi, Luigi Torre, Filippo Ubertini, Simon Laflamme 2018 Iowa State University

Durability Assessment Of Soft Elastomeric Capacitor Skin For Shm Of Wind Turbine Blades, Austin Downey, Anna Laura Pisello, Elena Fortunati, Claudia Fabiani, Francesca Luzi, Luigi Torre, Filippo Ubertini, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Renewable energy production has become a key research driver during the last decade. Wind energy represents a ready technology for large-scale implementation in locations all around the world. While important research is conducted to optimize wind energy production efficiency, a critical issue consists of monitoring the structural integrity and functionality of these large structures during their operational life cycle. This paper investigates the durability of a soft elastomeric capacitor strain sensing membrane, designed for structural health monitoring of wind turbines, when exposed to aggressive environmental conditions. The sensor is a capacitor made of three thin layers of an SEBS polymer ...


Dense Capacitive Sensor Array For Monitoring Distortion-Induced Fatigue Cracks In Steel Bridges, Xiangxiong Kong, Jian Li, William Collins, Caroline Bennett, Hongki Jo, Jong-Hyun Jeong, Simon Laflamme 2018 University of Kansas

Dense Capacitive Sensor Array For Monitoring Distortion-Induced Fatigue Cracks In Steel Bridges, Xiangxiong Kong, Jian Li, William Collins, Caroline Bennett, Hongki Jo, Jong-Hyun Jeong, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Distortion-induced fatigue cracks caused by differential deflections between adjacent girders are common issues for steel girder bridges built prior to the mid-1980s in the United States. Monitoring these fatigue cracks is essential to ensure bridge structural integrity. Despite various level of success of crack monitoring methods over the past decades, monitoring distortion-induced fatigue cracks is still challenging due to the complex structural joint layout and unpredictable crack propagation paths. Previously, the authors proposed soft elastomeric capacitor (SEC), a large-size flexible capacitive strain sensor, for monitoring in-plane fatigue cracks. The crack growth can be robustly identified by extracting the crack growth ...


Crack Detection In Rc Structural Components Using A Collaborative Data Fusion Approach Based On Smart Concrete And Large-Area Sensors, Austin Downey, Antonella D'Alessandro, Filippo Ubertini, Simon Laflamme 2018 Iowa State University

Crack Detection In Rc Structural Components Using A Collaborative Data Fusion Approach Based On Smart Concrete And Large-Area Sensors, Austin Downey, Antonella D'Alessandro, Filippo Ubertini, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Recent advances in the fields of nanocomposite technologies have enabled the development of highly scalable, low-cost sensing solution for civil infrastructures. This includes two sensing technologies, recently proposed by the authors, engineered for their high scalability, low-cost and mechanical simplicity. The first sensor consists of a smart-cementitious material doped with multi-wall carbon nanotubes, which has been demonstrated to be suitable for monitoring its own deformations (strain) and damage state (cracks). Integrated to a structure, this smart cementitious material can be used for detecting damage or strain through the monitoring of its electrical properties. The second sensing technology consists of a ...


Strain Monitoring In Masonry Structures Using Smart Bricks, Andrea Meoni, Antonella D'Alessandro, Austin Downey, Simon Laflamme, Filippo Ubertini 2018 University of Perugia

Strain Monitoring In Masonry Structures Using Smart Bricks, Andrea Meoni, Antonella D'Alessandro, Austin Downey, Simon Laflamme, Filippo Ubertini

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

Monitoring a building’s structural performance is critical for the identification of incipient damages and the optimization of maintenance programs. The characteristics and spatial deployment of any sensing system plays an essential role in the reliability of the monitored data and, therefore, on the actual capability of the monitoring system to reveal early-stage structural damage. A promising strategy for enhancing the quality of a structural health monitoring system is the use of sensors fabricated using materials exhibiting similar mechanical properties and durability as those of the construction materials. Based on this philosophy, the authors have recently proposed the concept of ...


A Novel Laser And Video-Based Displacement Transducer To Monitor Bridge Deflections, Miguel A. Vicente, Dorys C. Gonzalez, Jesus Minquez, Thomas Schumacher 2018 University of Burgos

A Novel Laser And Video-Based Displacement Transducer To Monitor Bridge Deflections, Miguel A. Vicente, Dorys C. Gonzalez, Jesus Minquez, Thomas Schumacher

Civil and Environmental Engineering Faculty Publications and Presentations

The measurement of static vertical deflections on bridges continues to be a first-level technological challenge. These data are of great interest, especially for the case of long-term bridge monitoring; in fact, they are perhaps more valuable than any other measurable parameter. This is because material degradation processes and changes of the mechanical properties of the structure due to aging (for example creep and shrinkage in concrete bridges) have a direct impact on the exhibited static vertical deflections. This paper introduces and evaluates an approach to monitor displacements and rotations of structures using a novel laser and video-based displacement transducer (LVBDT ...


Functional Trait Differences Between Native Bunchgrasses And The Invasive Grass Bromus Tectorum, Huiqin H.E., Thomas A. Monaco, Thomas A. Jones 2018 Yibin University

Functional Trait Differences Between Native Bunchgrasses And The Invasive Grass Bromus Tectorum, Huiqin H.E., Thomas A. Monaco, Thomas A. Jones

Forage and Range Research Laboratory Publications

We conducted 30- and 60-d greenhouse experiments to compare functional traits of Bromus tectorum (invasive annual grass) and four perennial bunchgrasses under well-watered or drought conditions. Even under drought, B. tectorum experienced significantly less stress (i.e., higher xylem pressure potential and greater shoot water content, water use per day and water-use efficiency) and biomass production than the perennial grasses after 30 d. However, after 60 d, its superiority was reduced under infrequent watering. Differences among perennial grasses were more pronounced for physiological traits under infrequent watering and for morphological traits under frequent watering. Elymus multisetus (fastgrowing species) had a ...


Hydrodynamic And Water Quality Modeling Of The Tigris River System In Iraq Using Ce-Qual-W2, Muhanned Al Murib 2018 Portland State University

Hydrodynamic And Water Quality Modeling Of The Tigris River System In Iraq Using Ce-Qual-W2, Muhanned Al Murib

Dissertations and Theses

The Tigris River is one of two primary rivers in Iraq and is, along with the Euphrates, the main source for drinking and irrigation water in the country. The Tigris River originates in the Taurus Mountains in Turkey, and is 1850 km long. The majority of the river, 1418 km lie within Iraq. The river passes through, and is the primary drinking water source for, major cities such as Mosul, Baeji, Samarra, Baghdad (the capital), and Kut. The Tigris River joints the Euphrates River in Qurna city within Basra province to form the Shatt Al-Arab River which eventually discharges into ...


The Subject Librarian Newsletter, Engineering And Computer Science, Spring 2018, Buenaventura "Ven" Basco 2018 University of Central Florida

The Subject Librarian Newsletter, Engineering And Computer Science, Spring 2018, Buenaventura "Ven" Basco

Libraries' Newsletters

No abstract provided.


Microwave Materials Characterization And Imaging For Structural Health Monitoring, Reza Zoughi 2018 Missouri University of Science and Technology

Microwave Materials Characterization And Imaging For Structural Health Monitoring, Reza Zoughi

Archived Webinars

The relatively small wavelengths and large bandwidths associated with microwave signals make them great candidates for inspection of construction materials and structures, and for materials characterization and imaging. Signals at these frequencies readily penetrate inside of dielectric materials and composites and interact with their materials characteristics and inner structures. Water molecule is dipolar and possesses a relatively large complex dielectric constant, which is also highly sensitive to the presence of ions that increase its electrical conductivity. Consequently, chemical and physical changes in construction materials affect their complex dielectric constant. This can be measured, and through analytical and empirical dielectric mixing ...


Performance Evaluation Of A Semi-Active Cladding Connection For Multi-Hazard Mitigation, Yongqiang Gong, Liang Cao, Laura Micheli, Simon Laflamme 2018 Iowa State University

Performance Evaluation Of A Semi-Active Cladding Connection For Multi-Hazard Mitigation, Yongqiang Gong, Liang Cao, Laura Micheli, Simon Laflamme

Civil, Construction and Environmental Engineering Conference Presentations and Proceedings

A novel semi-active damping device termed Variable Friction Cladding Connection (VFCC) has been previously proposed to leverage cladding systems for the mitigation of natural and man-made hazards. The VFCC is a semi-active friction damper that connects cladding elements to the structural system. The friction force is generated by sliding plates and varied using an actuator through a system of adjustable toggles. The dynamics of the device has been previously characterized in a laboratory environment. In this paper, the performance of the VFCC at mitigating non-simultaneous multi-hazard excitations that includes wind and seismic loads is investigated on a simulated benchmark building ...


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