Barrett, The Honors College Thesis/Creative Project Collection
Barrett, The Honors College at Arizona State University proudly showcases the work of undergraduate honors students by sharing this collection exclusively with the ASU community.
Barrett accepts high performing, academically engaged undergraduate students and works with them in collaboration with all of the other academic units at Arizona State University. All Barrett students complete a thesis or creative project which is an opportunity to explore an intellectual interest and produce an original piece of scholarly research. The thesis or creative project is supervised and defended in front of a faculty committee. Students are able to engage with professors who are nationally recognized in their fields and committed to working with honors students. Completing a Barrett thesis or creative project is an opportunity for undergraduate honors students to contribute to the ASU academic community in a meaningful way.
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- All Subjects: Concrete
- All Subjects: Engineers Without Borders
- Creators: Civil, Environmental and Sustainable Eng Program
Effects of Aggregate Packing Density on the Mechanical Properties of Ultra-High Performance Concrete
Description
Cement is a remarkable construction material that allows for the formation of complex geometric forms while still providing adequate strength properties to be used as a structural material. This research focuses on Ultra-High Performance Concrete (UHPC) which is a specialized class of cementitious material that exhibits exceptional strength and durability properties when compared to standard concrete. UHPC achieves these properties through a combination of high cement content, high particle packing density, low water-to-cement ratio, and the additional of special admixtures such as superplasticizer. These components all serve the purpose of increasing UHPC strength and mechanical properties by helping achieve much high material densities than other forms of concrete.
In this study, aggregate material evaluation and testing was conducted for use in the mix design of the UHPC mixes that were carried out and tested. Each mix employed the same general UHPC mixture design with the only difference being the aggregate proportions of #4, #8, and #10 nominal size aggregates. The purpose of using a UHPC mix design that was independent of aggregate proportioning was to evaluate the effects of varying aggregate particle packing densities. Increased particle packing density of UHPC provide improved mechanical performance by decreasing the distance between particle within cured UHPC, thereby producing significant increases in compressive strength, tensile strength, durability, and service life of UHPC when compared to standard concrete. For this study, particle packing densities of 0.509, 0.521, 0.540, and 0.552 were employed and evaluated on the basis of compressive strength and tensile strength to determine the optimum UHPC mix design.
In this study, aggregate material evaluation and testing was conducted for use in the mix design of the UHPC mixes that were carried out and tested. Each mix employed the same general UHPC mixture design with the only difference being the aggregate proportions of #4, #8, and #10 nominal size aggregates. The purpose of using a UHPC mix design that was independent of aggregate proportioning was to evaluate the effects of varying aggregate particle packing densities. Increased particle packing density of UHPC provide improved mechanical performance by decreasing the distance between particle within cured UHPC, thereby producing significant increases in compressive strength, tensile strength, durability, and service life of UHPC when compared to standard concrete. For this study, particle packing densities of 0.509, 0.521, 0.540, and 0.552 were employed and evaluated on the basis of compressive strength and tensile strength to determine the optimum UHPC mix design.
ContributorsThornburg, Cody Michael (Author) / Neithalath, Narayanan (Thesis director) / Rajan, Subramaniam (Committee member) / Civil, Environmental and Sustainable Eng Program (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
Volunteering can lead to many positive outcomes on individuals in terms of social, psychological, and professional development. This study sought to understand the process and mindset of volunteers and how their experience affects attitudes towards environment. The purpose of this study is to analyze the attitude change of volunteers toward the environment, culture, and community after volunteering at a community of a background different than theirs. In this study, the volunteer setting is in Shonto, a Native American community in the Navajo Nation, Arizona. This study utilized a qualitative research approach. A total of 12 participants were interviewed in this study. All participants were members of Engineers Without Borders (EWB) at Arizona State University and have traveled to Shonto. Questions were asked to participants about their experiences with EWB and their volunteering experiences in Shonto. The main findings were categorized into four themes: 1) motivations; 2) preconceived perceptions and exposure; 3) collaboration and connection; and 4) commonality and reflection. The findings can be described as a process that participants go through in their entire volunteering experience. The first two themes occur before individuals volunteer and the last two themes occur after. First, individuals develop certain motivations to volunteer. Then, the preconceived perceptions of individuals were analyzed, and it was presumed that these perceptions were a result of their upbringing and exposure, or lack thereof, to the community they volunteer at. The last two themes occur after the individuals have volunteered. Individuals are able to collaborate and form a connection with the community, which influences their awareness and their ability to reflect on their experiences. These last two themes are important because they indicate the change of perceptions that volunteers perceive. These findings connect the motivations that volunteers have all the way to their attitude changes after volunteering. Further, findings demonstrate that the preconceived perceptions are influenced by an individual’s upbringing or exposure, but these misconceptions are changed after volunteering experience, which supports contact theory. Through these findings the study contributes to the existing literature on voluntourism. This study is applicable to organizations and tour operators who offer volunteer tourism programs and work with communities of different backgrounds. It can provide individuals an insight to other volunteering experiences.
ContributorsRoman, Brian (Author) / Nyaupane, Gyan (Thesis director) / Legg, Eric (Committee member) / Civil, Environmental and Sustainable Eng Program (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2020-05