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Acoustic and Strength Characterization of Concrete and Wood- Based Composites Comprised of Micronized Rubber Powder

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Acoustic and Strength Characterization of Concrete and Wood- Based Composites Comprised of Micronized Rubber Powder Mississippi State University Scholars Junction Theses and Dissertations Theses and Dissertations 5-1-2019 Acoustic and Strength Characterization of Concrete and Wood- Based Composites Comprised of Micronized Rubber Powder John Cole Follow this and additional works at: https://scholarsjunction.msstate.edu/td Recommended Citation Cole, John, "Acoustic and Strength Characterization of Concrete and Wood-Based Composites Comprised of Micronized Rubber Powder" (2019). Theses and Dissertations. 364. https://scholarsjunction.msstate.edu/td/364 This Dissertation - Open Access is brought to you for free and open access by the Theses and Dissertations at Scholars Junction. It has been accepted for inclusion in Theses and Dissertations by an authorized administrator of Scholars Junction. For more information, please contact [email protected]. Template B v3.0 (beta): Created by J. Nail 06/2015 Acoustic and strength characterization of concrete and wood-based composites comprised of micronized rubber powder By TITLE PAGE John Cole A Dissertation Submitted to the Faculty of Mississippi State University in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in Forest Resources in the Department of Sustainable Bioproducts Mississippi State, Mississippi May 2019 Copyright by COPYRIGHT PAGE John Cole 2019 Acoustic and strength characterization of concrete and wood-based composites comprised of micronized rubber powder By APPROVAL PAGE John Cole Approved: ____________________________________ Jason Tyler Street (Major Professor) ____________________________________ Hyungsuk Lim (Committee Member) ____________________________________ R. Dan Seale (Committee Member) ____________________________________ Rubin Shmulsky (Committee Member) ____________________________________ H. Michael Barnes (Graduate Coordinator) ____________________________________ George Hopper Dean College of Forest Resources Name: John Cole ABSTRACT Date of Degree: May 3, 2019 Institution: Mississippi State University Major Field: Forest Resources Major Professor: Jason Tyler Street Title of Study: Acoustic and strength characterization of concrete and wood-based composites comprised of micronized rubber powder Pages in Study 132 Candidate for Degree of Doctor of Philosophy More than one billion vehicle tires reach the end of their useful service life annually. Less than a quarter of rubber waste is reused or recycled in some way. Interest has grown in working to discover means by which to incorporate rubber tire waste into construction materials. This study sought to delve into the use of micronized rubber powder (MRP) as an acoustic agent within particleboard and concrete. In addition, work was conducted to characterize the effect that MRP has on the strength and flexural properties of concrete. Furthermore, research sought to provide insight into how pine biomass, a forest products industry waste, would interact with MRP in concrete as it relates to strength and acoustic properties. As expected, particleboard that contained MRP resulted in lower strength but higher flexibility. Acoustic testing revealed that there was minimal sound absorption improvement at some frequencies and less absorption at low and high frequencies. Sound transmission loss was slightly improved by the addition of MRP to the particleboard. Adding pine biomass and MRP to concrete yielded much lower compressive strength as compared to plain concrete. Visual inspection of the sound absorption coefficient curves over the full range of test frequencies identified limited, if any, advantage for the addition of MRP or biomass. Some ranges of frequencies offered minimal improvement. There appeared to be no appreciable sound absorption advantage to adding MRP, pine biomass, or the combination of the two into concrete mix proportions. Modulus of rigidity was decreased as compared to plain concrete when MRP, pine biomass, or a combination of both were incorporated into the concrete mixture as volume replacement for aggregate. Visual observation revealed that flexural failure for the MRP or pine beams were less sudden and less catastrophic than the plain concrete samples. Modulus of elasticity was decreased as compared to plain concrete when MRP, pine biomass, or a combination of both were incorporated into the concrete mixture as volume replacement for aggregate. The more flexible and ductile concrete produced with MRP and biomass provides a combination of properties that serve to lessen the propagation of cracks throughout the specimen. DEDICATION I dedicate this work to my wife, Victoria (Tori) Taylor Cole, for all of her love and support. ii ACKNOWLEDGEMENTS I would first of all like to thank the Lord for providing me with the strength and endurance to accomplish this task and the opportunity to pursue it. Without His leadership, guidance, and provision I would not have been able to complete this project or degree. I want to thank my advisor, Dr. Jason Street, for his direction throughout the course of this project. He provided the knowledge and expertise that was required and helped me think through the challenges that I faced along the way. I would also like to thank him for the opportunity that he made available to me to pursue this graduate degree, especially given the unique challenges of my situation. My wife, Tori, was instrumental in helping me to press on with this project. When I was frustrated and tired, she encouraged me and gave me the support I needed to carry on. I greatly appreciate her for taking care of the kids and the duties around the house when I was busy in the office or in Starkville mixing concrete or testing samples. She picked up the slack and there is no way this degree or project would have been completed without her care and support. I thank our four children for all of the encouragement they gave me over the last several years. They were always inquisitive and eager to hear about my progress. iii I would like to thank my family for the support that they gave me and for the interest that they showed. I knew that they would be there for an encouraging word when I needed it. Dr. Cody Blake, and his wife Carrie, deserve a big thanks for helping me out several times during my work at Mississippi State University. Without Dr. Blake, I likely would not have discovered the opportunity to begin work in the Department of Sustainable Bioproducts with Dr. Street. The faculty and administration of the University of Tennessee at Martin Department of Agriculture, Geosciences, & Natural Resources were instrumental in the completion of these projects. Their encouragement to pursue a PhD were the push I needed to get started and the fuel to carry on. Several of my colleagues, including Dr. Sandy Mehlhorn, Dr. Paula Gale, and Dr. Rachna Tewari, were there to provide help and encouragement all along the way. In addition, the University of Tennessee at Martin Engineering department also provided valuable assistance and use of concrete testing equipment. Thanks to Lehigh Technologies of Tucker, GA USA for providing the Micronized Rubber Powder (MRP) that was utilized in the research projects. iv TABLE OF CONTENTS DEDICATION .................................................................................................................... ii ACKNOWLEDGEMENTS ............................................................................................... iii LIST OF TABLES ........................................................................................................... viii LIST OF FIGURES ............................................................................................................ x CHAPTER I. INTRODUCTION ................................................................................................1 Review of Literature and Previous Research ........................................................1 Significance of Research .......................................................................................3 Objectives ..............................................................................................................3 II. ACOUSTIC AND STRENGTH CHARACTERIZATION OF PARTICLEBOARD AND MICRONIZED RUBBER POWDER COMPOSITES ..........................................................................................5 Abstract ..................................................................................................................5 Keywords .........................................................................................................6 Introduction ...........................................................................................................6 Literature Review ............................................................................................6 Significance of Study ....................................................................................10 Objectives ......................................................................................................10 Materials and Methods ........................................................................................11 Materials ........................................................................................................11 Sample Preparation ........................................................................................12 Physical Properties Testing ...........................................................................15 Mechanical Properties Testing ......................................................................15
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