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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 focuses on recent changes in Arizona eminent domain law regarding the question of whether a use be "truly public." In light of the landmark decision in Bailey v City of Mesa--often lauded as a great victory for proponents of private property rights-- a few sources will be reviewed to provide an indication of the extent redevelopment in Arizona has been affected by the decision. While the result in Bailey, precluding the City from taking the subject property may have been the correct outcome, the test to which the case now subjects any similar case involving redevelopment has made it unnecessarily difficult for political subdivisions of the state to carry out legislated redevelopment goals. The Bailey case only served to convolute the question of "public use" in the context of economic development, rather than create a workable body of law. In addition to providing a historical context and analyzing the effect of new interpretations on redevelopment generally, this paper will critique the Bailey decision in order to resolve the conflict that the decision created: that of the redevelopment goals of the state and municipalities and the authorized use of condemnation to achieve these goals with the judiciary's decision to greatly restrict the use of condemnation for the achievement of redevelopment goals. Arguably this conflict arose from a failure to fully understand the complexities of the use of the power of eminent domain for redevelopment purposes. Unaware of the need to use eminent domain in order to speed along and make possible economic redevelopment, overzealous proponents of property rights have reduced the issue to a narrow view of the state vs. the individual. Hopefully this paper can offer a more moderate and unbiased view of the use of eminent domain in light of the charge of the state and municipalities to facilitate economic growth.
ContributorsStern-Sapad, Zalman Badi (Author) / Birnbaum, Gary (Thesis director) / Braselton, James (Committee member) / Barrett, The Honors College (Contributor) / W. P. Carey School of Business (Contributor)
Created2015-05
Description
Abstract I sought out a project that would be able to intertwine the topics of business law and the business of sports. After reading and researching a few different options, one combination of law and sports that stood out to me was the frequent labor disputes between NHL owners and the players' union. The main goal of this project was to examine whether or not the lockouts that were instituted by National Hockey League owners during the labor disputes that occurred in 2004 and 2012 actually left the league with a better long term financial and social landscape. Through the examination of the stakeholders that were involved in each dispute and their resulting situations, I presented my answer to the above question. In order to properly study the overall situation, I also discussed the history of sports business, the history of the National Hockey League's business landscape, and collective bargaining in sports amongst other topics.
ContributorsNix, Eric Anthony (Author) / Eaton, John (Thesis director) / Kutz, Elana (Committee member) / Barrett, The Honors College (Contributor) / Department of Marketing (Contributor) / W. P. Carey School of Business (Contributor)
Created2015-05
Description
This thesis will focus on the organizational structures and leadership challenges within private law firms. It begins by explaining the different roles within the organizational structure. It will then discuss various other duties that are carried out by lawyers in addition to legal work. Through the use of qualitative methodology, including a review of scholarly literature and semi-formal interviews with private firm partners, this research mainly focuses on the challenges that exist in private law firms. The study concludes with possible solutions to address the discussed challenges in private law firms.
ContributorsKrikorian, Dikranouhi (Author) / Trujillo, Rhett (Thesis director) / Waldman, David (Committee member) / Barrett, The Honors College (Contributor) / W. P. Carey School of Business (Contributor) / Department of Management (Contributor)
Created2015-05
Description
Certain laws relating to self-defense were created known as "Stand Your Ground" laws. The public has interpreted these laws in ways that expand them beyond their original scope. To gain an understanding of self-defense laws, a look at the origins of self-defense is needed. Following the historical background, several cases will be examined that illustrate how the public has interpreted "Stand Your Ground" laws, and how these interpretations clash with elements of self-defense. Several philosophical principles including natural rights, the social contract, and some form of utilitarianism, will be discussed in relation to "Stand Your Ground" laws. A possible conclusion can be drawn that by misinterpreting "Stand Your Ground" laws, people compromise the philosophical ideals they hold, and infringe on other people's natural rights, break the social contract, and create societal unhappiness. Finally, some people are calling for reform of "Stand Your Ground" laws. These reforms focus on correcting public perception of "Stand Your Ground" laws.
ContributorsSmith, Geramya Joseph (Author) / Sigler, Mary (Thesis director) / Stanford, Michael (Committee member) / Kader, David (Committee member) / Barrett, The Honors College (Contributor) / Sandra Day O'Connor College of Law (Contributor) / W. P. Carey School of Business (Contributor)
Created2013-05
Description
Volume depletion can lead to migraines, dizziness, and significant decreases in a subject's ability to physically perform. A major cause of volume depletion is dehydration, or loss in fluids due to an imbalance in fluid intake to fluid excretion. Because proper levels of hydration are necessary in order to maintain both short and long term health, the ability to monitor hydration levels is growing in clinical demand. Although devices capable of monitoring hydration level exist, these devices are expensive, invasive, or inaccurate and do not offer a continuous mode of measurement. The ideal hydration monitor for consumer use needs to be characterized by its portability, affordability, and accuracy. Also, this device would need to be noninvasive and offer continuous hydration monitoring in order to accurately assess fluctuations in hydration data throughout a specified time period. One particular method for hydration monitoring that fits the majority of these criteria is known as bioelectric impedance analysis (BIA). Although current devices using BIA do not provide acceptable levels of accuracy, portability, or continuity in data collection, BIA could potentially be modified to fit many, if not all, desired customer specifications. The analysis presented here assesses the viability of using BIA as a new standard in hydration level measurement. The analysis uses data collected from 22 subjects using an existing device that employs BIA. A regression derived for estimating TBW based on the parameters of age, weight, height, sex, and impedance is presented. Using impedance data collected for each subject, a regression was also derived for estimating impedance based on the factors of age, weight, height, and sex. The derived regression was then used to calculate a new impedance value for each subject, and these new impedance values were used to estimate TBW. Through a paired-t test between the TBW values derived by using the direct measurements versus the calculated measurements of impedance, the two samples were found to be comparable. Considerations for BIA as a noninvasive measurement of hydration are discussed.
ContributorsTenorio, Jorge Antonio (Author) / LaBelle, Jeffrey (Thesis director) / Pizziconi, Vincent (Committee member) / Spano, Mark (Committee member) / Barrett, The Honors College (Contributor) / W. P. Carey School of Business (Contributor) / Harrington Bioengineering Program (Contributor)
Created2013-05
Description
Modern Americans ignorantly live under a blanket of unread terms, conditions, and binding contracts. Often, these contracts (mostly associated with products and services) come and go with little effect. Periodically, the products or services cause the consumer harm, leading them to seek repair. The consumer then realizes that all the fine print they failed to read makes an impactful legal difference. This paper analyzes the work of Professor Radin through her book, Boilerplate. It goes on to explore many other arguments presented by contract theorists and makes substantial claims regarding the dangers of boilerplate (unread terms and conditions).
ContributorsBecker, Alexander Daniel (Author) / Koretz, Lora (Thesis director) / Calleros, Charles (Committee member) / Barrett, The Honors College (Contributor) / W. P. Carey School of Business (Contributor) / Department of English (Contributor)
Created2015-05
Description
My thesis explores the role that implicit gender bias plays in the courtroom. From personal experience, I have seen the way that gender has been a factor in the courtroom as a result of both competing in and coaching Mock Trial. As a competitor, my gender was always a factor in that I was told that I couldn't do something because I am female. As a coach, I found myself reinforcing these ideas of gender because that was what I was taught, even though I didn't agree with them. I decided to explore the role of gender in the courtroom using Mock Trial as a framework to study how implicit gender biases is present. As a result of my research, I argue that implicit gender bias is present in the courtroom, and that these biases create barriers for female success. I have conducted research based on a variety of sources, beginning with looking at the role women have historically played in the courtroom to current issues facing women attorneys today. I have researched the role of implicit gender bias and studied how these biases impact women and hinder their success. I conducted research through distribution of the coach survey and analyzed the responses. From these finding I have concluded that implicit gender bias is a factor in the courtroom and that these biases tend to negatively affect women competitors. I conclude that that more research and studies need to be done to make individuals aware of how implicit gender bias functions in the courtroom and how coaches in Mock Trial may be contributing to the reinforcement of these biases.
ContributorsDuarte Luna, Ariana Maria (Author) / Stoff, Laurie (Thesis director) / Amazeen, Nia (Committee member) / Department of Psychology (Contributor) / W. P. Carey School of Business (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05
Description
The objective of this research study is to assess the effectiveness of a poster-based messaging campaign and engineering-based activities for middle school and high school students to encourage students to explore and to pursue chemical engineering. Additionally, presentations are incorporated into both methods to provide context and improve understanding of the presented poster material or activity. Pre-assessments and post-assessments are the quantitative method of measuring effectiveness. For the poster campaign, ASU juniors and seniors participated in the poster campaign by producing socially relevant messages about their research or aspirations to address relevant chemical engineering problems. For the engineering-based activity, high school students participated in an Ira A. Fulton Schools of Engineering program "Young Engineers Shape the World" in which the students participated in six-hour event learning about four engineering disciplines, and the chemical engineering presentation and activity was conducted in one of the sessions. Pre-assessments were given at the beginning of the event, and the post-assessments were provided towards the end of the event. This honors thesis project will analyze the collected data.
ContributorsBueno, Daniel Tolentino (Author) / Ganesh, Tirupalavanam (Thesis director) / Parker, Hope (Committee member) / Chemical Engineering Program (Contributor) / School of Historical, Philosophical and Religious Studies (Contributor) / W. P. Carey School of Business (Contributor) / Barrett, The Honors College (Contributor)
Created2017-05