Made available in DSpace on 2014-12-17T14:06:57Z (GMT). No. of bitstreams: 1
MariaLLOS.pdf: 1560615 bytes, checksum: 3380ba58cfe3314d3e58ae0d9f253793 (MD5)
Previous issue date: 2008-08-25 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / Current environmental concerns include the excessive consumption and inefficient use of non-renewable natural resources. The construction industry is considered one of the largest consumers of natural raw materials, significantly contributing to the environmental degradation of the planet. The use of calcareous quarry (RPPC) and porcelain tile polishing residues (RPP) as partial replacements of the cement in mortars is an interesting alternative to minimize the exploration of considerably large amounts of natural resources. The present study aimed at investigating the properties of fresh and hardened mortars produced using residues to replace cement. The residues used were fully characterized to determine their specific mass, unitary mass, particle size distribution and morphology, and composition. The
performance of the mortars was compared to that of reference compositions, prepared without residues. A total of 18 compositions were prepared, 16 using residues and 2 reference ones. The mortars were prepared using Portland CP II F 32 cement, CH I hydrated lime, river sand and tap water. The compositions of the mortars were 1:1:6 and 1:0.5:4.5 (vol%), and water to cement ratios of 1.87 and 1.45 were used, respectively. The mortars in the fresh state were evaluated by consistency index, water retention, density of mass and incorporated air content tests. In their hardened state, the mortars were evaluated by apparent mass density, modulus of elasticity, flexural tensile strength, compressive strength and water absorption by capillarity. The mortars were also analyzed by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and fluorescence. Finally, they were classified according to NBR 13281 standards. The mortars prepared using residues partially replacing the cement exhibited lower modulus of elasticity compared to the reference compositions, thus improving the performance in their intended use. On the downside, the water absorption by capillarity was affected by the presence of residues and both the tensile and compressive
strength were reduced. However, from the overall standpoint, the replacement of cement by calcareous quarry or porcelain tile polishing residues did not result in significant changes in the properties of the mortars. Therefore, compositions containing these residues can be used in the construction industry / A preocupa??o ambiental diz respeito, entre outras coisas, ao consumo excessivo ou ineficiente de recursos naturais n?o-renov?veis (LEITE, 2001). A ind?stria da constru??o civil
? considerada como a maior consumidora de mat?rias-primas naturais, contribuindo assim, de maneira relevante, para uma maior degrada??o do meio ambiente. A utiliza??o do res?duo de
pedreira de rocha calc?ria (RPPC) e res?duo do polimento do porcelanato (RPP), em substitui??o parcial do cimento, pode ser um caminho alternativo para minimiza??o deste problema. Esta pesquisa teve como objetivo estudar as propriedades no estado fresco e endurecido das argamassas mistas produzidas com res?duos (RPPC e RPP), comparando o desempenho das mesmas com as argamassas de refer?ncia. Na produ??o dessas argamassas se utilizou o cimento Portland CP II F 32, cal hidratada CH I, areia de rio e ?gua da concession?ria local. Os res?duos utilizados foram caracterizados quanto a massa espec?fica, massa unit?ria, granulometria a laser,microscopia eletr?nica de varredura, difratometria de raios-X e fluoresc?ncia de raios-X. Os tra?os utilizados foram 1:1:6 e 1:0,5:4,5, ambos em volume, com a rela??o ?gua/cimento fixada, respectivamente, em 1,87 e 1,45. Foram produzidas 18 composi??es de argamassas, 16 utilizando RPPC e RPP e 02 composi??es convencionais que serviram de refer?ncia. Com as argamassas no estado fresco, foram realizados os ensaios de ?ndice de consist?ncia, reten??o de ?gua, densidade de massa e teor de ar incorporado. J? no estado endurecido, os ensaios realizados foram: densidade de massa aparente, m?dulo de elasticidade, resist?ncia ? tra??o na flex?o, resist?ncia ? compress?o e absor??o de ?gua por capilaridade. As argamassas foram analisadas por microscopia eletr?nica de varredura, espectroscopia de raios-X por energia dispersiva (EDS), difra??o de raios-X e fluoresc?ncia de raios-X. Al?m disso, foram classificadas quanto aos padr?es estabelecidos pela NBR 13281 (ABNT, 2005). Os resultados encontrados mostram que as argamassas formuladas com res?duos n?o sofreram altera??es significativas no que se refere ao ?ndice de consist?ncia, reten??o de ?gua, densidade de massa no estado fresco, teor de ar incorporado e densidade de massa aparente no estado endurecido. J? em rela??o ao m?dulo de elasticidade a presen?a dos res?duos na mistura ocasionou a diminui??o do mesmo, melhorando assim o desempenho da argamassa. Por?m, a resist?ncia ? tra??o na flex?o e ? resist?ncia ? compress?o, al?m da absor??o de ?gua por capilaridade, tiveram o seu desempenho comprometidos
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12711 |
| Date | 25 August 2008 |
| Creators | Santos, Maria Luiza Lopes de Oliveira |
| Contributors | CPF:15724520800, http://lattes.cnpq.br/0022988322449627, Melo, Dulce Maria de Ara?jo, CPF:06117988320, http://lattes.cnpq.br/3318871716111536, Marinho, ?rika Pinto, CPF:02381892443, http://lattes.cnpq.br/1192938961586608, Barreto, Alexandro Di?genes, CPF:79059050444, http://lattes.cnpq.br/7824794714646180, Almeida, Maria das Vit?rias Vieira de, CPF:52402444487, http://lattes.cnpq.br/7590200701773198, Melo, Marcus Ant?nio de Freitas, Martinelli, Ant?nio Eduardo |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
Page generated in 0.0188 seconds