Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-11-22T20:18:43Z No. of bitstreams: 1 ZodinioLaurisaMonteiroSampaio_TESE.pdf: 4245538 bytes, checksum: 687e089323cb706bdb8dc70fe1aa7593 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-11-23T00:28:27Z (GMT) No. of bitstreams: 1 ZodinioLaurisaMonteiroSampaio_TESE.pdf: 4245538 bytes, checksum: 687e089323cb706bdb8dc70fe1aa7593 (MD5) / Made available in DSpace on 2017-11-23T00:28:27Z (GMT). No. of bitstreams: 1 ZodinioLaurisaMonteiroSampaio_TESE.pdf: 4245538 bytes, checksum: 687e089323cb706bdb8dc70fe1aa7593 (MD5) Previous issue date: 2017-04-25 / The high-energy demand involved in the construction industry and the increasing consumption of concrete made this material an ideal option for the recycling of by-products from various industries such as: porcelain polishing residue (PPR); tire rubber residue (TRR) and limestone residue (LSR). These residues often lack a treatment that contributes to the degradation of the environment. In this sense, the use of by-products that increases the volume of the concrete without damaging significantly its properties, can be a viable option in the production of low-cost and sustainable low-weight concrete (LWC). The main objective of this work was to analyze the mechanical and thermal behavior of structural lightweight concrete (SLWC) with low cement consumption, produced with expanded clay (EC) in replacement of the aggregate and with the addition of PPR, TRR and LSR to replace the small aggregate. For this purpose, a 2? factorial design was used for the choice of SLWC with the best performance in terms of consistency, mechanical properties and density. Subsequently, reductions of 10, 20 and 30% of cement were performed on SLWC that presented better combination of properties and waste consumption and were characterized by mechanical tests. The best SLWC mix resulting from the combination of mechanical properties and cement consumption was characterized by permeability, flexural strength, TG/DTA, XRF, SEM, thermal capacity, thermal conductivity and thermal diffusivity. The results showed that residues contents around 21% presented better combination of properties. By maintaining the amount of residue at optimum levels it was possible to produce a SLWC with good rheological, mechanical and thermal properties with minimum cement consumption. / A alta demanda energ?tica envolvida na ind?stria da constru??o civil e o crescente consumo do concreto, fez com que o concreto se tornasse a op??o ideal para a reciclagem de subprodutos de v?rias industrias tais como: res?duo de polimento de porcelanato PPR; res?duo de borracha de pneu (TRR) e res?duo de pedra calc?ria (LSR). Esses res?duos frequentemente carecem de um tratamento adequando o que acaba contribuindo para a degrada??o do meio ambiente. Nesse sentido, o uso de subprodutos que ir?o aumentar o volume do concreto sem prejudicar muito as propriedades, pode ser uma op??o bastante vi?vel na produ??o de Concretos leves (CL) de baixo custo e sustent?veis. O objetivo geral desse trabalho foi analisar o comportamento mec?nico e t?rmico de concretos leves estruturais (CLE) de baixo teor de cimento produzidos com argila expandida (AE) em substitui??o ao agregado gra?do e com adi??o de PPR, TRR e LSR em substitui??o a parte do agregado mi?do. Para tal foi usado inicialmente um planejamento fatorial 2? para a escolha dos CLE com melhor desempenho em termos de consist?ncia, propriedades mec?nicas e massa espec?fica real. Posteriormente foram realizadas redu??es de 10, 20 e 30% de cimento nos CLE que apresentaram melhores desempenhos e caracterizados atrav?s de ensaios mec?nicos. O melhor tra?o resultante da combina??o de propriedades mec?nicas com o consumo de cimento foi caracterizado mediante ensaios de: permeabilidade; resist?ncia ? flex?o; TG/DTA; FRX; MEV; capacidade t?rmica; condutividade t?rmica e difusividade t?rmica. Por fim. Os resultados mostraram que teores de res?duos em torno de 21% apresentaram melhor combina??o de propriedades. Mantendo os teores de res?duos em n?veis ?timos foi poss?vel produzir um CLE com boas propriedades reol?gicas, mec?nicas e t?rmicas com um consumo m?nimo de cimento.

Made available in DSpace on 2014-12-17T14:07:22Z (GMT). No. of bitstreams: 1 FranciscoASJ_TESE.pdf: 8792658 bytes, checksum: 82015e9b1bc788b7c608317086cdc276 (MD5) Previous issue date: 2014-05-30 / Researches have shown that the introduction of rubber in concrete improves the features of its deformability, as well as contributes to environmental disposal of waste generated in the tire retreading process. Furthermore, there is a high availability of limestone within RN and CE country. Ignorance about this stone, does not allow its wide use as aggregate, leaving, this abundant supply idle. A composite of limestone gravel, with proportions of tire rubber waste which could be used as concrete would be an alternative to concrete for low applications. Therefore, this research aims to evaluate the characteristics of concrete containing limestone gravel and proportions of little aggregate replacement (sand) by tire rubber waste. To this goal, the material components of the concrete were characterized, concrete specimens with limestone gravel were made, from the dash 1.0: 2.5: 3.5, varying the water/cement ratio, and inserting a commercial plasticizer, without a proportion of residue, known as reference. From this, concrete with and without the presence of the additive in the same proportions were chosen, as well as these with the use of granite gravel, for being the most used. Selected the references, to these, replacements of little aggregate (sand) were added replaced by rubber waste from the tire retreading process, treated with 1M NaOH in proportions from 5.0 to 20.0 % by mass, cured and exposed to the semiarid environment. The results indicate the possibility of using limestone gravel in the concrete composition with workability correction using plasticizer. There was a decrease in the mechanical properties of the concrete with increments of waste rubber, but there is an improvement in toughness and deformability of the composite, which makes it interesting for the construction of non-structural concrete floors, as well as, the rubber waste delayed the hardening process, continuing to gain resistance after 28 days / Pesquisas t?m mostrado que a introdu??o de borracha no concreto melhoram as caracter?sticas de deformabilidade deste, assim como, contribuem para destina??o ambiental de res?duos gerados no processo de recauchutagem de pneus. Somado a isto, existe uma alta disponibilidade de rocha calc?ria no interior do RN e do CE. O n?o conhecimento desta pedra, n?o possibilita sua ampla utiliza??o como agregado, deixando, esta farta oferta ociosa. Um comp?sito de brita do tipo calc?ria, com propor??es de res?duo de borracha de pneu que pudesse ser utilizado como concreto seria uma alternativa para concretos destinados a baixas solicita??es. Logo, este trabalho possui como objetivo a avalia??o das carater?sticas de concretos contendo brita calc?ria e propor??es de substitui??o do agregado mi?do (areia) por res?duo de borracha de pneus. Para tanto, caracterizou-se os materiais componentes do concreto, confeccionou-se corpos de prova de concretos com brita calc?ria, a partir do tra?o 1,0: 2,5: 3,5, variando-se a rela??o ?gua/cimento, e inserindo-se um plastificante comercial, sem a propor??o de res?duo, chamados de refer?ncia. A partir deste, foram escolhidos nas mesmas propor??es concretos com e sem a presen?a do aditivo, assim como, estes com a utiliza??o da brita gran?tica, por ser a mais utilizada. Escolhidas as refer?ncias, a estas foram acrescidas substitui??es de parte do agregado mi?do (areia) por res?duo de borracha de pneu proveniente do processo de recauchutagem, tratados com NaOH 1 M, nas propor??es de 5,0 a 20,0 % em massa, curados e expostos ao ambiente semi?rido. Os resultados indicam a possibilidade de utiliza??o da brita calc?ria na composi??o do concreto com corre??o da trabalhabilidade utilizando-se plastificante. Observou-se uma diminui??o nas propriedades mec?nicas dos concretos com incrementos de res?duo de borracha, por?m existe uma melhora de tenacidade, e deformabilidade do comp?sito, o que o torna interessante para a constru??o de pisos de concretos n?o estruturais, assim como, o res?duo retardou o processo de endurecimento, continuando o concreto a ganhar resist?ncia, ap?s os 28 dias