Characterization of Quarry By-Products as a Partial Replacement of Cement in Cementitious Composites

dc.contributor.authorNguyen, Tu-Nam N.en
dc.contributor.committeechairBrand, Alexander S.en
dc.contributor.committeememberCase, Scott W.en
dc.contributor.committeememberCaddick, Mark J.en
dc.contributor.departmentCivil and Environmental Engineeringen
dc.date.accessioned2023-08-22T08:00:51Zen
dc.date.available2023-08-22T08:00:51Zen
dc.date.issued2023-08-21en
dc.description.abstractConcrete is the most widely used man-made material in the world. Its versatility, strength, and relative ease of construction allow it to be used in the majority of civil infrastructure. However, concrete production plays a significant role in greenhouse gas emissions, accounting for around 8% of CO2 emissions worldwide. This thesis aims to reduce the demand for cement in concrete construction, thus reducing the carbon footprint of the concrete, by focusing on classifying and determining the effectiveness of seven different quarry by-products as partial replacements of cement. Several methods were utilized in this study to characterize the quarry by-products: particle size distribution, helium pycnometry, X-Ray diffraction, X-Ray fluorescence, scanning electron microscopy, and a modified ASTM C1897 Method A that utilizes isothermal calorimetry and thermogravimetric analysis. These various methods allowed for the determination of the physical properties (e.g., gradation, specific gravity, and morphology) and the chemical properties (e.g., mineralogy and reactivity in a cementitious system). The quarry by-products were classified as four granites, two limestones, and one greenstone. These quarry by-products were found to be non-pozzolanic and non-hydraulic. However, there are indications that there may be reactions with the various clays and feldspars in the quarry by-products with calcium hydroxide, which suggests a degree of reactivity that is not necessarily pozzolanic or hydraulic.en
dc.description.abstractgeneralConcrete is the most widely used man-made material in the world. Its versatility, strength, and relative ease of construction allow it to be used in the majority of civil infrastructure. However, concrete production plays a significant role in greenhouse gas emissions, accounting for around 8% of CO2 emissions worldwide. This thesis aims to reduce the demand for cement in concrete construction, thus reducing the carbon footprint of the concrete, by focusing on classifying and determining the effectiveness of seven different quarry by-products as partial replacements of cement. Several methods were utilized in this study to determine the physical properties (e.g., gradation, specific gravity, and morphology) and the chemical properties (e.g., mineralogy and reactivity in a cementitious solution) of the materials. The quarry by-products were classified as four granites, two limestones, and one greenstone. In general, these quarry by-products were not found to be reactive as a supplementary cementitious material, although the data may suggest some degree of reactivity between calcium hydroxide and the clays and/or feldspars in the quarry by-products.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:38298en
dc.identifier.urihttp://hdl.handle.net/10919/116075en
dc.language.isoenen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectQuarry By-Productsen
dc.subjectCementen
dc.subjectSupplementary Cementitious Materialsen
dc.subjectMineral Filleren
dc.subjectParticle Size Distributionen
dc.subjectHelium Pycnometryen
dc.subjectX-Ray Diffractionen
dc.subjectX-Ray Fluorescenceen
dc.subjectScanning Electron Microscopyen
dc.subjectIsothermal Calorimetryen
dc.subjectThermogravimetric Analysisen
dc.titleCharacterization of Quarry By-Products as a Partial Replacement of Cement in Cementitious Compositesen
dc.typeThesisen
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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