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 Collection: UNT Theses and Dissertations
From Associates to Antagonists: the United States, Great Britain, the First World War, and the Origins of War Plan Red, 1914-1919

From Associates to Antagonists: the United States, Great Britain, the First World War, and the Origins of War Plan Red, 1914-1919

Date: May 2012
Creator: Gleason, Mark C.
Description: American military plans for a war with the British Empire, first discussed in 1919, have received varied treatment since their declassification. the most common theme among historians in their appraisals of WAR PLAN RED is that of an oddity. Lack of a detailed study of Anglo-American relations in the immediate post-First World War years makes a right understanding of the difficult relationship between the United States and Britain after the War problematic. As a result of divergent aims and policies, the United States and Great Britain did not find the diplomatic and social unity so many on both sides of the Atlantic aspired to during and immediately after the First World War. Instead, United States’ civil and military organizations came to see the British Empire as a fierce and potentially dangerous rival, worthy of suspicion, and planned accordingly. Less than a year after the end of the War, internal debates and notes discussed and circulated between the most influential members of the United States Government, coalesced around a premise that became the rationale for WAR PLAN RED. Ample evidence reveals that contrary to the common narrative of “Anglo-American” and “Atlanticist” historians of the past century, the First World War did ...
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Effect of Age on Likelihood to Test for Hiv

Effect of Age on Likelihood to Test for Hiv

Date: May 2012
Creator: Dreyer, Katherine
Description: HIV/AIDS can affect individuals of any age. Efforts to educate those considered to be most at-risk, based on the age at which the most individuals are infected, are ongoing and public. Less work and mainstream education outreach, however, is being directed at an older population, who can be more likely to contract HIV, is more susceptible to the effects of HIV, and more likely to develop AIDS, than younger persons. Guided by the Health Belief Model theory, research was conducted to determine what, if any, relationship existed between age of an individual and the possibility that an HIV test will be sought. Factors of gender, education, ethnicity and marital status were included in analyses. the research indicated that as age increased, likelihood for getting an HIV test decreased. Overall, most individuals had not been tested for HIV. the implications of an aged and aging population with HIV include a need for coordinated service delivery, increased education and outreach.
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A Global Stochastic Modeling Framework to Simulate and Visualize Epidemics

A Global Stochastic Modeling Framework to Simulate and Visualize Epidemics

Date: May 2012
Creator: Indrakanti, Saratchandra
Description: Epidemics have caused major human and monetary losses through the course of human civilization. It is very important that epidemiologists and public health personnel are prepared to handle an impending infectious disease outbreak. the ever-changing demographics, evolving infrastructural resources of geographic regions, emerging and re-emerging diseases, compel the use of simulation to predict disease dynamics. By the means of simulation, public health personnel and epidemiologists can predict the disease dynamics, population groups at risk and their geographic locations beforehand, so that they are prepared to respond in case of an epidemic outbreak. As a consequence of the large numbers of individuals and inter-personal interactions involved in simulating infectious disease spread in a region such as a county, sizeable amounts of data may be produced that have to be analyzed. Methods to visualize this data would be effective in facilitating people from diverse disciplines understand and analyze the simulation. This thesis proposes a framework to simulate and visualize the spread of an infectious disease in a population of a region such as a county. As real-world populations have a non-homogeneous demographic and spatial distribution, this framework models the spread of an infectious disease based on population of and geographic distance between ...
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Alterations in Fatty Acid Amide Hydrolase (Faah) Transcript Levels and Activity Lead to Changes in the Abiotic Stress Susceptibility of Arabidopsis Thaliana

Alterations in Fatty Acid Amide Hydrolase (Faah) Transcript Levels and Activity Lead to Changes in the Abiotic Stress Susceptibility of Arabidopsis Thaliana

Date: May 2012
Creator: Gonzalez, Gabriel
Description: N-Acylethanolamines (NAEs) are a class of bioactive lipids, and FAAH is one of the enzymes responsible for degrading NAEs in both plants and animals. in plants, FAAH appears to be closely associated with ABA, a phytohormone which has long been associated with plant stress responses, since the overexpression of FAAH in Arabidopsis results in ABA hypersensitivity. Therefore, it is reasonable to speculate that alterations in FAAH transcript levels will result in altered stress responses in plants. to investigate this hypothesis experiments were carried out in which wild type (WT), FAAH-overexpressing (OE), and T-DNA insertional FAAH knockouts of Arabidopsis (faah) were grown in MS media under stress conditions. the stress conditions tested included chilling stress, heavy metal stress induced by cadmium or copper, nutrient limitations induced by low phosphorus or low nitrogen, salt stress induced with NaCl, and osmotic stress induced with mannitol. the OE plants were consistently hypersensitive to all stress conditions in relation to wild type plants. Inactive FAAH overexpressors did not have the hypersensitivity to the salt and osmotic stress of the active OE plants and were instead tolerant to these stresses. FAAH2 (faah2) knockouts and FAAH 1 and 2 double knockouts (faah 1+2) were based on some ...
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Ota-quadrotor: An Object-tracking Autonomous Quadrotor for Real-time Detection and Recognition

Ota-quadrotor: An Object-tracking Autonomous Quadrotor for Real-time Detection and Recognition

Date: May 2012
Creator: Coelho, Gavin
Description: The field of robotics and mechatronics is advancing at an ever-increasing rate and we are starting to see robots making the transition from the factories to the workplace and homes as cost is reduced and they become more useful. In recent years quadrotors have become a popular unmanned air vehicle (UAV) platform. These UAVs or micro air vehicles (MAV) are being used for many new and exciting applications such as aerial monitoring of wildlife, disaster sites, riots and protests. They are also being used in the film industry, as they are significantly cheaper means of getting aerial footage. While quadrotors are not extremely expensive a good system can cost in the range of $3000 - $8000 and thus too costly as a research platform for many. There are a number of cheaper open source platforms. The ArduCopter is under constant development, has the largest community and is inexpensive making it an ideal platform to work with. The goal of this thesis was to implement video processing on a ground control station allowing for the ArduCopter to track moving objects. This was achieved by using the OpenCV video-processing library to implement object tracking and the MAVLink communication protocol, available on the ...
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Forgiveness and Loneliness: Stress and Anxiety’s Correlates in a Student and Clinical Hiv-positive Sample

Forgiveness and Loneliness: Stress and Anxiety’s Correlates in a Student and Clinical Hiv-positive Sample

Date: May 2012
Creator: Hill, Jonathan
Description: Persistent periods of stress exacerbate the symptoms of chronic illness. Additionally, loneliness is strongly correlated with stress and both state and trait anxiety. Prolonged periods of loneliness are linked with depression in both clinical and student samples. Forgiveness, a cognitive, emotional, and behavioral response to interpersonal or intrapersonal conflict, is important to social harmony. in this study I describe three studies that examine forgiveness, loneliness, stress, and anxiety in two populations, a student population and an HIV+ clinical population. Study 1 examined how the variables of forgiveness and loneliness are associated with perceived stress in a student sample of undergraduate students. Study 2 examined the same variables (forgiveness, loneliness, and perceived stress) in an HIV-positive clinical population. Finally, study 3 extends the model and examines the relationship of forgiveness and loneliness to variables related to stress, state and trait anxiety. for studies 2 and 3, 63 HIV-positive individuals participated in the cross-sectional correlational study. the data was analyzed in each study using hierarchical linear regression analysis. We also tested the models for the three studies to determine if forgiveness moderates the relationship between loneliness and state and trait anxiety. in study 1, using hierarchical linear regression analyses, I found that ...
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Mental Toughness: An Analysis of Sex, Race, and Mood

Mental Toughness: An Analysis of Sex, Race, and Mood

Date: May 2012
Creator: Beck, Nicholas M.
Description: Mental toughness has become a focus for researchers as coaches, athletes, and others extol its influence in performance success. In this study I examined mental toughness among collegiate athletes, focusing on its potential relationship to different demographic variables and to the athletes’ mood. Two hundred seventy-two student-athletes representing 12 different sports from a southwestern NCAA Division I university, participated by completing the Sports Mental Toughness Questionnaire (SMTQ), the Brief Assessment of Mood (BAM), and providing demographic information. Analyses of variance (ANOVA) assessed differences in mental toughness scores by sex, race, scholarship status, and starting status. Significant differences in mental toughness emerged between Black – White, male – female, and full – partial – zero scholarship athletes. Pearson correlations showed mental toughness was significantly related to lower levels of anxiety, sadness, anger, confusion, fatigue, and total mood disturbance, and higher levels of vigor.
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Never Odd Or Even: Using Temporal Structures In Composing Music For Dance

Never Odd Or Even: Using Temporal Structures In Composing Music For Dance

Date: May 2012
Creator: Bernardo, Daniel
Description: This study engages the collaboration of dance and music, focusing primarily on experiences in the production of a large scale collaborative concert entitled Never Odd or Even. Famous historical collaborations offer archetypal collaborative models, the more unconventional of which are applied to the pieces of the concert. Issues and observations regarding cross-influence, project evolution, and application of the collaborative models are engaged to determine effective means of collaboration given different circumstances. The key focus of the study, the temporal relationship between music and dance, is explored in great detail to determine three models for relating time between music and dance. These temporal relationship models are applied to the pieces and evaluated on effectiveness and potential strengths when applied to dance.
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A Multiscalar Analysis of Buruli Ulcer in Ghana: Environmental and Behavioral Factors in Disease Prevalence

A Multiscalar Analysis of Buruli Ulcer in Ghana: Environmental and Behavioral Factors in Disease Prevalence

Date: May 2012
Creator: Ferring, David
Description: Buruli ulcer (BU), an infectious disease caused by Mycobacterium ulcerans, is the third most common mycobacterial disease after leprosy and tuberculosis and a WHO-defined neglected tropical disease. Despite years of research, the mode of transmission of BU remains unknown. This master’s thesis provides an integrated spatial analysis of disease dynamics in Ghana, West Africa, an area of comparatively high BU incidence. Within a case/matched control study design, environmental factors associated with BU infection and spatial behaviors are investigated to uncover possible links between individual daily activity spaces and terrains of risk across disturbed landscapes. This research relies upon archival and field-collected data and analyses conducted with geographical information systems (GIS).
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Spatial Analysis of Hiv/aids Survival in Dallas and Harris Counties, Texas

Spatial Analysis of Hiv/aids Survival in Dallas and Harris Counties, Texas

Date: May 2012
Creator: Heald, Stephanie
Description: More Texans are living with HIV infection than ever before. in fact, there has been a 6% increase annually, since 2002. This trend is not a result of increased HIV/AIDS incidence, but rather improving life expectancy of those living with HIV. Due to significant advances in HIV/AIDS testing, prevention, and treatment, individuals with HIV are living longer than ever before. However, throughout the state, the life expectancy of a person infected with HIV/AIDS varies spatially. This study investigates and attempts to explain the spatial distribution of HIV/AIDS survival rates by examining neighborhood socioeconomic characteristics. the results suggest that, contrary to expectation, the lowest survival rates occur, not in extreme poverty areas, but rather in moderate SES areas. Too rich to qualify for free treatments, but not rich enough to afford purchasing such treatments, the middle income living with HIV infection are caught between the cracks. the results provide important input for targeting public health interventions to improve HIV/AIDS survival.
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Analyzing Visitors’ Discourse, Attitudes, Perceptions, and Knowledge Acquisition in an Art Museum Tour After Using a 3D Virtual Environment

Analyzing Visitors’ Discourse, Attitudes, Perceptions, and Knowledge Acquisition in an Art Museum Tour After Using a 3D Virtual Environment

Date: May 2012
Creator: D’ Alba, Adriana
Description: The main purpose of this mixed methods research was to explore and analyze visitors’ overall experience while they attended a museum exhibition, and examine how this experience was affected by previously using a virtual 3dimensional representation of the museum itself. The research measured knowledge acquisition in a virtual museum, and compared this knowledge acquired between a virtual museum versus a real one, employing a series of questionnaires, unobtrusive observations, surveys, personal and group interviews related to the exhibition and the artist. A group of twenty-seven undergraduate students in their first semester at the College of Architecture and Design of the Autonomous University of the State of Mexico participated in the research, and were divided in two groups, one of which used a 3D virtual representation previous to the museum visit. Results show that participants who experienced the virtual museum concurred that using it was a positive experience that prepared them to go to the real museum because they knew already what they were going to find. Most of the participants who experienced the virtual museum exhibited an increased activity during their museum visit, either agreeing, being more participative, concurring and showing acceptance, asking questions, or even giving their opinion and ...
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Perceived Effects of a Mid-length Study Abroad Program

Perceived Effects of a Mid-length Study Abroad Program

Date: May 2012
Creator: Corbin, Jill K.
Description: The focus of the study was the University of Dallas’ Rome Program, a mid-length study abroad program on the university’s campus in Rome, Italy. The program is designed to provide participants with the opportunity to encounter firsthand Western tradition by integrating the core curriculum through classroom teachings and class excursions, thus solidifying the foundation of the participants’ undergraduate education. Beyond this purpose, the Rome Program does not operate from established goals and objectives for student experience. I consulted relevant research literature to construct a schema of domains of development appropriate to this qualitative study. These domains were intellectual development, global perspective, career development, and spiritual development. I interviewed 20 University of Dallas seniors who participated in the mid-length study abroad program between fall 2009 and spring 2011, using an extended, semi-structured interview protocol. The participants included 11 females and 9 males; 19 White and 1 Hispanic. The findings were supported by subsequent review by 4 of the interviewed students. I found generally strong but inconsistent support for student development in each of the domains. A number of sub-themes are reported. Through the interviews, an additional theme of personal development emerged and is reported. Although the findings generally support the conclusion ...
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Establishing Junior-level Colleges in Developing Nations: a Site Selection Process Using Data From Uganda

Establishing Junior-level Colleges in Developing Nations: a Site Selection Process Using Data From Uganda

Date: May 2012
Creator: Iaeger, Paula Irene
Description: This research synthesizes data and presents it using mapping software to help to identify potential site locations for community-centered higher education alternatives and more traditional junior-level colleges in Uganda. What factors can be used to quantify one site over another for the location of such an institution and if these factors can be isolated; why should they be used by local authorities? the variables are secured from the Southern and Eastern Africa Consortium for Monitoring Educational Quality (SACMEQ), Afrobarometer, census data, as well as technology reports and surveys. These variables are reduced, grouped and mapped to help determine the best location for a junior-level college. the use of local expert opinion on geopolitical, economic, and educational situations can be interfaced with the database data to identify potential sites for junior-level colleges with the potential to reduce the failure rate of such post-secondary school ventures. These data are analyzed in the context of reported higher education policies and outcomes from the national ministries, United Nations Educational, Scientific and Cultural Organization (UNESCO), quality assurances agencies in the region, the World Bank, and national datasets. the final product is a model and tool that can be used by local experts to better select ...
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Tactile Media: Factors Affecting the Adoption of Touchscreen Smartphones Among Consumers with Vision Loss

Tactile Media: Factors Affecting the Adoption of Touchscreen Smartphones Among Consumers with Vision Loss

Date: May 2012
Creator: Bradley, Sapora L.
Description: Touchscreen technology is on the rise as the new standard in smartphone design. But, the usability of touchscreen is hindered for consumers that lack the physical ability to navigate such devices. Two focus groups were conducted in order to identify specific uses and gratifications that people with visual impairments had when using mobile phones. Additional questions were presented to the participants to determine if touchscreen technology limited access to communication and entertainment. The responses revealed an upward trend in touchscreen smartphone adoption among the participants. These users chose to adopt touchscreen smartphones that had built-in and downloadable assistive features which contributed to user-friendly designs.
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My Whine, Your Wine

My Whine, Your Wine

Date: December 2011
Creator: Abbott, Shannon Marie
Description: Grapes hold the flavors of the lands where they grow, and when you make wine from them, those flavors of the land come through. Tasting wine from a place you've been can bring you back to that place with aromas and notes indicative of that place. A bottle of wine changes every day, and how it will taste depends on the moment you choose to release it from the glass walls. I have a vested interest in wine, because it is a living thing. I am compelled to make wine because its characteristics are like personality traits. Although some of those characteristics are harsh at times, I appreciate them all. Each trait plays an important role in the balance, the overall personality. Like my own personality flaws, wine's harsh tones can smooth over time. My relationship with wine is constantly evolving, with every new varietal, vintage, batch and blend. Believe me, after some of the jobs I had before my first day at Su Vino, I cherish every moment of my winemaking career. My Whine, Your Wine is the story of how it all started.
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The Chopin Etudes: a Study Guide for Teaching and Learning Opus 10 and Opus 25

The Chopin Etudes: a Study Guide for Teaching and Learning Opus 10 and Opus 25

Access: Use of this item is restricted to the UNT Community.
Date: December 2011
Creator: Kim, Min Joung
Description: The etudes of Chopin are masterworks of the piano literature and are designed to go beyond mere technical exercises; moreover, each etude represents not only a technical study but also has a distinct musical character. Alarmingly, the current trend seems to be to assign the Chopin etudes at an increasingly young age to students who are not yet equipped either technically or musically to handle them. As Chopin’s pupil, Carl Mikuli, commented in the preface to his Chopin edition, the etudes were meant for “more advanced students.” If Chopin had intended his etudes for students at an intermediate level, he would have assigned them to most of his students; however, only a limited number of students had his permission to work on their master’s etudes. As a teacher, I have always felt the need to devise a systematic teaching plan to guide students to handle the challenges of these pieces both physically and musically. This study examines the repertoire which might help prepare a student to learn the etudes without overstraining his/her muscular and mental ability. Rooted in Chopin’s teaching and his recommendation of the pieces to learn before tackling the etudes themselves, this pedagogical study guide intends to help ...
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Reducing Undesirable Behavior with Stimulus Control

Reducing Undesirable Behavior with Stimulus Control

Date: May 2012
Creator: Davison, Matthew Alan
Description: The present experiment investigated the application of Green and Swets (1966) signal-detection theory to undesirable behavior as a method of reducing unwanted behaviors using reinforcement and extinction. This experiment investigated the use of this stimulus control technique to reduce undesirable behaviors using a multiple-baseline design. Once the cue for a target behavior was established and maintained, the use of the verbal cue was reduced in frequency and the rate of unprompted undesirable behavior was recorded. Generalization was tested across multiple people. Data for this experiment showed that undesirable behavior could be reduced by altering the stimulus control that maintained it.
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The Relationship Between Cardiorespiratory Fitness and Bmi, Depressive Symptoms, and School Absences Among a Racial/ethnically Diverse Sample of Early Adolescents

The Relationship Between Cardiorespiratory Fitness and Bmi, Depressive Symptoms, and School Absences Among a Racial/ethnically Diverse Sample of Early Adolescents

Date: May 2012
Creator: Garza, Mariana
Description: The current study examined the relationship between cardiorespiratory fitness on differences by sex, race/ethnicity, and SES on BMI, depressive symptoms, and school absences among adolescents. a cross-sectional study was conducted in a north Texas school district, which included 609 Caucasian/Whites, 293 Hispanic/Latinos, and 113 African-American/Black adolescents (10-14 years). Main results of the study showed that that cardiorespiratory fitness was the largest predictor of BMI, followed by race/ethnicity, and then sex. Cardiorespiratory fitness among adolescents was inversely associated with BMI. the relationship between cardiorespiratory fitness on BMI appeared to be more salient for non-Hispanic white females and non-Hispanic black females in that the former group had lower BMI scores than the latter group when cardiorespiratory fitness was taken into account; however, results showed that non-Hispanic white females and non-Hispanic black females had similar cardiorespiratory fitness level. Other results showed that SES and sex predicted depressive symptoms in that low SES females endorsed more depressive symptoms relative to high SES males; however, this relationship was non-existent when cardiorespiratory fitness was entered into the model. Additionally, findings indicated that BMI and depressive symptoms equally predicted school absences in that adolescents who had a higher BMI and endorsed more depressive symptoms had more school ...
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Factors Associated with Behavioral Intention to Disclose Personal Information on Geosocial Networking Applications

Factors Associated with Behavioral Intention to Disclose Personal Information on Geosocial Networking Applications

Date: May 2012
Creator: Cox, Trissa
Description: Information privacy is a major concern for consumers adopting emerging technologies dependent on location-based services. This study sought to determine whether a relationship exists among factors of personalization, locatability, perceived playfulness, privacy concern and behavioral intention to disclose personal information for individuals using location-based, geosocial networking applications. Questionnaire responses from undergraduate students at a 4-year university provide insight into these relationships. Multiple regression results indicated that there was a statistically significant relationship between the four significant predictor variables and the dependent variable. Analysis of beta weights, structure coefficients, and commonality analysis shed light on the variance attributable to the predictor variables of the study. Findings provide understanding of the specific factors examined in the study and have implications for consumers, businesses, application designers, and policymakers. The results from this study contribute to an understanding of technology acceptance theory and offer insight into competing beliefs that may affect an individual’s behavioral intention to disclose personal information. Knowledge gained form the study may be useful for overcoming challenges related to consumer adoption of location-based services that require disclosure of personal information.
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Road Debris

Road Debris

Access: Use of this item is restricted to the UNT Community.
Date: May 2012
Creator: Dewoody, Dale W.
Description: This dissertation comprises two parts: Part I, which discusses the growing trend in project books in contemporary poetry, and Part II, a collection of poems titled, Road Debris. There is an increasing trend in the number of project books, which are collections of poetry unified in both thematic and formal ways. the individual poems in a project book share overt connections which allow the book to work on many different levels, blending elements of fiction and non-fiction or sharing a specific theme or speaker. While these books have the advantage of being easily memorable, which might gain poets an edge in book contests, there are also many risks involved. the main issue surrounding project books is if the individual poems can justify the book, or do they seem too repetitive or forced. As more poets, especially newer ones, try to use the project book as a shortcut to publication, it can result in poorly written poems forced to fit into a particular concept. By examining three successful cotemporary project books—The Quick of It, by Eamon Grennan; Incident Light, by H. L. Hix; and Romey’s Order by Astory Riley—this essay discusses how these books work in order to understand the potential ...
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Rapid Prototyping and Design of a Fast Random Number Generator

Rapid Prototyping and Design of a Fast Random Number Generator

Date: May 2012
Creator: Franco, Juan
Description: Information in the form of online multimedia, bank accounts, or password usage for diverse applications needs some form of security. the core feature of many security systems is the generation of true random or pseudorandom numbers. Hence reliable generators of such numbers are indispensable. the fundamental hurdle is that digital computers cannot generate truly random numbers because the states and transitions of digital systems are well understood and predictable. Nothing in a digital computer happens truly randomly. Digital computers are sequential machines that perform a current state and move to the next state in a deterministic fashion. to generate any secure hash or encrypted word a random number is needed. But since computers are not random, random sequences are commonly used. Random sequences are algorithms that generate a pattern of values that appear to be random but after some time start repeating. This thesis implements a digital random number generator using MATLAB, FGPA prototyping, and custom silicon design. This random number generator is able to use a truly random CMOS source to generate the random number. Statistical benchmarks are used to test the results and to show that the design works. Thus the proposed random number generator will be useful ...
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Fractures for Clarinet and Computer

Fractures for Clarinet and Computer

Date: May 2012
Creator: Dixon, Gregory Hart
Description: Fractures for Clarinet and Computer is a piece for live interactive performance using custom software designed in Max/MSP. the work explores musical borrowing and transformation of music from works such as Tchaikovsky’s Fifth Symphony, Gershwin’s Rhapsody in Blue, and several fragments from synthesizer recordings of the late 1960’s and early 1970’s. the dissertation focuses on both the musical aesthetics that informed the creation of the work and the software programming that enables live sampling and harmonization systems as well as flexible control of global parameters.
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The Argei: Sex, War, and Crucifixion in Rome and the Ancient Near East

The Argei: Sex, War, and Crucifixion in Rome and the Ancient Near East

Date: May 2012
Creator: Ewin, Kristan Foust
Description: The purpose of the Roman Argei ceremony, during which the Vestal Virgins harvested made and paraded rush puppets only to throw them into the Tiber, is widely debated. Modern historians supply three main reasons for the purpose of the Argei: an agrarian act, a scapegoat, and finally as an offering averting deceased spirits or Lares. I suggest that the ceremony also related to war and the spectacle of displaying war casualties. I compare the ancient Near East and Rome and connect the element of war and husbandry and claim that the Argei paralleled the sacred marriage. in addition to an agricultural and purification rite, these rituals may have served as sympathetic magic for pre- and inter-war periods. As of yet, no author has proposed the Argei as a ceremony related to war. By looking at the Argei holistically I open the door for a new direction of inquiry on the Argei ceremony, fertility cults in the Near East and in Rome, and on the execution of war criminals.The Argei and new year’s sacred marriage both occurred during the initiation of campaign and spring planting and harvest season. Both in the ancient Near East and in Rome, animal victims were sacrificed ...
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Effects of Rebar Temperature and Water to Cement Ratio on Rebar-Concrete Bond Strength of Concrete Containing Fly Ash

Effects of Rebar Temperature and Water to Cement Ratio on Rebar-Concrete Bond Strength of Concrete Containing Fly Ash

Date: May 2010
Creator: Pati, Ardeep Ranjan
Description: This research presents the results on an experimental investigation to identify the effects of rebar temperature, fly ash and water to cement ratio on concrete porosity in continuously reinforced concrete pavements (CRCP). Samples were cast and analyzed using pullout tests. Water to cement ratio (w/c) and rebar temperature had a significant influence on the rebar-concrete bond strength. The 28-day shear strength measurements showed an increase in rebar-concrete bond strength as the water to cement ratio (w/c) was reduced from 0.50 to 0.40 for both fly ash containing and non fly ash control samples. There was a reduction in the peak pullout load as the rebar surface temperature increased from 77o F to 150o F for the cast samples. A heated rebar experiment was performed simulating a rebar exposed to hot summer days and the rebar cooling curves were plotted for the rebar temperatures of 180o F - 120o F. Fourier transform infrared spectroscopy was performed to show the moisture content of cement samples at the rebar-concrete interface. Mercury intrusion porosimetry test results on one batch of samples were used for pore size distribution analysis. An in-depth analysis of the morphological characteristics of the rebar-concrete interface and the observation of pores ...
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