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dc.contributor.advisorSuárez, O. Marcelo
dc.contributor.authorGarcía-Berrios, Nitza M.
dc.date.accessioned2018-11-21T15:42:00Z
dc.date.available2018-11-21T15:42:00Z
dc.date.issued2015
dc.identifier.urihttps://hdl.handle.net/20.500.11801/1486
dc.description.abstractThe decision making process in modern construction industry is challenging when recycle materials are required. One such approach is the replacement of cement by fly ash. Unfortunately, this replacement lowers concrete’s compressive strength at its early age. To counterbalance this loss, nanosilica is being utilized. The relationships among different components upon concrete fabrication require a design of experiments with mixtures to model concrete compressive strength. A single criteria optimization strategy was adopted to recommend mixture combinations that maximize the compressive strength. The results serve as a guide to control the additions of these mineral admixtures to design a material that withstands a desired level of compressive strength. The second stage of this work encompasses the use of a multiple-criteria optimization method to optimize several concrete performance measures simultaneously, namely concrete density, porosity, and compressive strength. This approach allows recommending mixtures that contain the mineral admixtures, in addition of conventional mixtures.en_US
dc.description.abstractEl proceso de toma de decisiones en la industria de la construcción actual es complejo cuando se requieren materiales reciclables. Un enfoque de este tipo es el reemplazo de cemento por ‘fly ash’. Desafortunadamente, éste reemplazo reduce la resistencia a compresión del concreto durante su edad temprana. Para contrarrestar esta pérdida, sílica nano-estructurada está siendo utilizada. La relación entre diferentes componentes en la fabricación de concreto requiere un diseño experimental con mezclas para modelar la resistencia a compresión del concreto. Una estrategia de optimización de un solo criterio fue adoptada para recomendar combinaciones de mezclas que maximicen la resistencia a compresión. Los resultados sirven como guía para controlar las adiciones de estos aditivos minerales para así diseñar un material que soporte cierto nivel de resistencia a compresión. La segunda etapa de este trabajo incluye el uso de una metodología de optimización multi-criterio para optimizar ciertas medidas de desempeño del concreto simultáneamente, llamadas densidad, porosidad, y resistencia a compresión. Este enfoque permite recomendar mezclas que contienen los aditivos minerales, además de las mezclas convencionales.en_US
dc.description.sponsorshipThis work was supported by the National Science Foundation under Grants No. HRD 0833112 & 1345156 (CREST program). Additional support was provided by the US Department of Education through Grant No. P120A120097 (MSEIP program).en_US
dc.language.isoEnglishen_US
dc.subjectFly ashen
dc.subjectConcrete’s compressive strengthen
dc.subjectnanosilicaen
dc.titleEffect of fly ash and nanosilica on concrete compressive strength at early ageen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c)2015 Nitza M. García-Berriosen_US
dc.contributor.committeeCabrera, Mauricio
dc.contributor.committeeDávila, Saylisse
dc.contributor.committeeTorres, Wandaliz
dc.contributor.representativeMégret, Rémi
thesis.degree.levelM.S.en_US
thesis.degree.disciplineIndustrial Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Industrial Engineeringen_US
dc.description.graduationSemesterSpring (2nd semester)en_US
dc.description.graduationYear2015en_US


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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a graduate degree at UPR-Mayagüez.

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