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- Creators: Neithalath, Narayanan
Description
Alkali-activated aluminosilicates, commonly known as "geopolymers", are being increasingly studied as a potential replacement for Portland cement. These binders use an alkaline activator, typically alkali silicates, alkali hydroxides or a combination of both along with a silica-and-alumina rich material, such as fly ash or slag, to form a final product with properties comparable to or better than those of ordinary Portland cement. The kinetics of alkali activation is highly dependent on the chemical composition of the binder material and the activator concentration. The influence of binder composition (slag, fly ash or both), different levels of alkalinity, expressed using the ratios of Na2O-to-binders (n) and activator SiO2-to-Na2O ratios (Ms), on the early age behavior in sodium silicate solution (waterglass) activated fly ash-slag blended systems is discussed in this thesis. Optimal binder composition and the n values are selected based on the setting times. Higher activator alkalinity (n value) is required when the amount of slag in the fly ash-slag blended mixtures is reduced. Isothermal calorimetry is performed to evaluate the early age hydration process and to understand the reaction kinetics of the alkali activated systems. The differences in the calorimetric signatures between waterglass activated slag and fly ash-slag blends facilitate an understanding of the impact of the binder composition on the reaction rates. Kinetic modeling is used to quantify the differences in reaction kinetics using the Exponential as well as the Knudsen method. The influence of temperature on the reaction kinetics of activated slag and fly ash-slag blends based on the hydration parameters are discussed. Very high compressive strengths can be obtained both at early ages as well as later ages (more than 70 MPa) with waterglass activated slag mortars. Compressive strength decreases with the increase in the fly ash content. A qualitative evidence of leaching is presented through the electrical conductivity changes in the saturating solution. The impact of leaching and the strength loss is found to be generally higher for the mixtures made using a higher activator Ms and a higher n value. Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR-FTIR) is used to obtain information about the reaction products.
ContributorsChithiraputhiran, Sundara Raman (Author) / Neithalath, Narayanan (Thesis advisor) / Rajan, Subramaniyam D (Committee member) / Mobasher, Barzin (Committee member) / Arizona State University (Publisher)
Created2012
Description
The alkali activation of aluminosilicate materials as binder systems derived from industrial byproducts have been extensively studied due to the advantages they offer in terms enhanced material properties, while increasing sustainability by the reuse of industrial waste and byproducts and reducing the adverse impacts of OPC production. Fly ash and ground granulated blast furnace slag are commonly used for their content of soluble silica and aluminate species that can undergo dissolution, polymerization with the alkali, condensation on particle surfaces and solidification. The following topics are the focus of this thesis: (i) the use of microwave assisted thermal processing, in addition to heat-curing as a means of alkali activation and (ii) the relative effects of alkali cations (K or Na) in the activator (powder activators) on the mechanical properties and chemical structure of these systems. Unsuitable curing conditions instigate carbonation, which in turn lowers the pH of the system causing significant reductions in the rate of fly ash activation and mechanical strength development. This study explores the effects of sealing the samples during the curing process, which effectively traps the free water in the system, and allows for increased aluminosilicate activation. The use of microwave-curing in lieu of thermal-curing is also studied in order to reduce energy consumption and for its ability to provide fast volumetric heating. Potassium-based powder activators dry blended into the slag binder system is shown to be effective in obtaining very high compressive strengths under moist curing conditions (greater than 70 MPa), whereas sodium-based powder activation is much weaker (around 25 MPa). Compressive strength decreases when fly ash is introduced into the system. Isothermal calorimetry is used to evaluate the early hydration process, and to understand the reaction kinetics of the alkali powder activated systems. A qualitative evidence of the alkali-hydroxide concentration of the paste pore solution through the use of electrical conductivity measurements is also presented, with the results indicating the ion concentration of alkali is more prevalent in the pore solution of potassium-based systems. The use of advanced spectroscopic and thermal analysis techniques to distinguish the influence of studied parameters is also discussed.
ContributorsChowdhury, Ussala (Author) / Neithalath, Narayanan (Thesis advisor) / Rajan, Subramanium D. (Committee member) / Mobasher, Barzin (Committee member) / Arizona State University (Publisher)
Created2013
Description
This paper explains what factors influence mental health issues and what type of care is provided in various countries. The countries in this study will include the United States, Japan, Ethiopia and South Africa, all of which have varying degrees of ethnic diversity, economic status and understanding of mental health issues. It discusses the specific healthcare systems in each country, as well as the attitudes and problems associated with depression and schizophrenia, two prevalent mental health disorders. This paper examines the different ways that a diagnosis is reached for schizophrenia and major depression in these different countries, as well as what methods are used for treating individuals with these disorders. It will also examine the prominent notion that schizophrenia has better outcomes in developing countries than in places that have wider medical care available. It then discusses what treatments are available in each country, as well as social constructs that exist regarding those treatments in order to understand the ways that treatments can be expanded to improve outcomes. This paper will then examine the different outcomes of these mental health disorders that are common in each country, and conclude with ideas on how to make global mental health a reality.
ContributorsOlsen, Rachel Lindsay (Author) / Gaughan, Monica (Thesis director) / Wood, Reed (Committee member) / Barrett, The Honors College (Contributor) / School of Politics and Global Studies (Contributor) / School of Human Evolution and Social Change (Contributor) / Department of Psychology (Contributor)
Created2015-05
Description
This study examined associations between Latino parents' cultural orientation and their behaviors in support of their 9th grade adolescents in science (n= 104). Parents reported their orientation to mainstream U.S. and Latino culture, traditional cultural values, and immigration status. Adolescents reported how often their parents engaged with them in science related behaviors, such as general positive support in science, school involvement, teaching them things about science, discussing the future, and engaging in science-related co-activity. Results indicate that adolescent boys whose parents lack U.S. documentation are in greatest need of parent support in science.
ContributorsGastelum, Alexandra Nicole (Author) / Simpkins, Sandra (Thesis director) / Updegraff, Kimberly (Committee member) / Barrett, The Honors College (Contributor) / School of Politics and Global Studies (Contributor) / School of Social Transformation (Contributor)
Created2014-05
Description
If democracy is the best way to rule why then is it limited only to the political sphere? This question is central to economic democracy which is the theory that economic activities should be governed by democratic principles. In America, ESOPs are used for a variety of reasons, and I believe that they can be used for the development of democratic firms. My thesis looks at current ESOPs to see if they are democratic, and suggests how they can be used to develop democratic firms.
ContributorsHeth, Zachary Fredrick (Author) / Simhony, Avital (Thesis director) / Lennon, Tara (Committee member) / Barrett, The Honors College (Contributor) / Department of Chemistry and Biochemistry (Contributor) / School of Politics and Global Studies (Contributor) / School of Life Sciences (Contributor)
Created2014-05
Description
Time studies are an effective tool to analyze current production systems and propose improvements. The problem that motivated the project was that conducting time studies and observing the progression of components across the factory floor is a manual process. Four Industrial Engineering students worked with a manufacturing company to develop Computer Vision technology that would automate the data collection process for time studies. The team worked in an Agile environment to complete over 120 classification sets, create 8 strategy documents, and utilize Root Cause Analysis techniques to audit and validate the performance of the trained Computer Vision data models. In the future, there is an opportunity to continue developing this product and expand the team’s work scope to apply more engineering skills on the data collected to drive factory improvements.
Contributorsde Guzman, Lorenzo (Co-author) / Chmelnik, Nathan (Co-author) / Martz, Emma (Co-author) / Johnson, Katelyn (Co-author) / Ju, Feng (Thesis director) / Courter, Brandon (Committee member) / Industrial, Systems & Operations Engineering Prgm (Contributor, Contributor) / School of Politics and Global Studies (Contributor) / Industrial, Systems & Operations Engineering Prgm (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
DescriptionMy creative project is a brand new Barrett, The Honors course that examines the complex and evolving intersections between natural disasters, culture, and resilience in Italy.
ContributorsNavia, Bianca Christine (Author) / Dal Martello, Chiara (Thesis director) / Vitullo, Juliann (Committee member) / School of Politics and Global Studies (Contributor, Contributor) / School of International Letters and Cultures (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2020-12
Description
Over the last 30 years, the public has become somewhat less willing to accept the “feminist” label. However, most Americans indicate support for general feminist ideals. In fact, many of these ideals have become so prevalent in American culture that they are not considered feminist anymore. This thesis will examine the reason behind this disparity and analyze where public opinion began to shift. The disparity between the definition of feminism and the definition perceived by the public will be explored along with the idea that the American people still want and need a “feminist movement,” but that its current state is not resonating with the majority of the public.
ContributorsKasle, Lauren Jessica (Author) / Lennon, Tara (Thesis director) / Woodall, Gina (Committee member) / School of Public Affairs (Contributor) / School of Life Sciences (Contributor) / School of Politics and Global Studies (Contributor, Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
This thesis explores the power of food to transcend cultural and racial borders and to act as a common ground, bringing people of all different backgrounds together. Through globalization, there is an increased movement of people from their homeland to different regions around the world and with this migration comes the spread of their culture and cuisine to new areas. This spreading of culture often creates friction and tension amongst other cultures, however as this thesis argues, with increased diversity, there is the great potential for greater interaction with other cultures and therefore greater appreciation. The key aspect of this thesis is the ways in which food can be used as a tool to overcome racial barriers and serve as a means of positive expression of a culture. I hope to show that by engaging with a culture through its cuisine, one can arguably build a greater appreciation for that culture and therefore lower their preconceived notions and stereotypes.
ContributorsZayanderoudi, Rana Patricia (Author) / Talebi, Shahla (Thesis director) / Eaton, John (Committee member) / School of Politics and Global Studies (Contributor) / Economics Program in CLAS (Contributor) / Department of Management and Entrepreneurship (Contributor) / Dean, W.P. Carey School of Business (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
By volunteering with a microfinance program in the historic coastal town of Saint-Louis, Senegal in the fall of 2016, I became embedded within the Senegalese culture and gained a unique perspective on the loan process. Coordinated by the for-profit organization, Projects Abroad, the microfinance office aimed to help women and Talibés (young men studying the Quran) gain financial independence through small-scale sustainable entrepreneurship while simultaneously providing its volunteers with meaningful experiences.
The purpose of my thesis is to examine the interactions among the Senegalese staff, international volunteers, and Senegalese loan participants, and the ways in which their constantly evolving reactionary relationships impacted the program. The paper provides a context of Saint-Louis, Senegal as well as the Projects Abroad Organization and outlines the loan process prior to examining the daily activities of the program. I highlight important factors such as religion, education, gender roles, and saving techniques in order to show how juxtaposing values and traditions played key roles in the program’s evolution. Ultimately, I argue that the heterogeneity of values, norms, and expectations among those participating in the program created both obstacles and opportunities for program implementation and the ways in which to gauge its success.
By sharing my personal observations and experiences, I hope to provide the reader with a greater understanding of the complexities of intercultural communication in the microfinance arena. In the words of the American economist and philosopher Tyler Cowen, “Real cultural diversity results from the interchange of ideas, products, and influences, not from the insular development of a single national style.”
The purpose of my thesis is to examine the interactions among the Senegalese staff, international volunteers, and Senegalese loan participants, and the ways in which their constantly evolving reactionary relationships impacted the program. The paper provides a context of Saint-Louis, Senegal as well as the Projects Abroad Organization and outlines the loan process prior to examining the daily activities of the program. I highlight important factors such as religion, education, gender roles, and saving techniques in order to show how juxtaposing values and traditions played key roles in the program’s evolution. Ultimately, I argue that the heterogeneity of values, norms, and expectations among those participating in the program created both obstacles and opportunities for program implementation and the ways in which to gauge its success.
By sharing my personal observations and experiences, I hope to provide the reader with a greater understanding of the complexities of intercultural communication in the microfinance arena. In the words of the American economist and philosopher Tyler Cowen, “Real cultural diversity results from the interchange of ideas, products, and influences, not from the insular development of a single national style.”
ContributorsDavis, Claire Mello (Author) / Sivak, Henry (Thesis director) / Haines, Chad (Committee member) / School of Politics and Global Studies (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05