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Previous issue date: 2015-04-10 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Neste trabalho, foi desenvolvido um bloco solo-cimento com material de mudan?a de fase (MMF), denominado ?material inteligente? por se adequar a temperaturas definidas. Inicialmente, as propriedades f?sicas e qu?micas, e a morfologia do solo argiloso do semi-?rido do estado do RN, sem adi??o de areia e com adi??o de 10% de areia, foram analisadas; como tamb?m as de um outro solo argiloso da regi?o do Alentejo, em Portugal, ao qual foi adicionado 30% de areia 04 para adequ?-lo as normas da ABNT e ter as mesmas caracter?sticas do solo local. Para estudar o desempenho da argamassa para fabrica??o do bloco solo-cimento, e as suas propriedades t?rmicas, porcentagens de 0%, 3% e 5%, em peso, de parafina n-eicosano, com ponto de fus?o de 37?C; e de parafina 120/130F, com ponto de fus?o de 50.3?C, foram adicionadas ao solo argiloso do RN. Para o solo argiloso de Portugal, foram adicionadas apenas 5%, em peso, de parafina sasolwas e n-eicosano. Ap?s a mistura dos constituintes em massa (cimento, ?gua, MMFs, e os solos argilosos), a argamassa foi prensada numa prensa manual sob press?o de 2MPa, a fim de estabilizar e dar forma ao bloco. Ao t?rmino da cura, foram realizados os ensaios de resist?ncia mec?nica por compress?o simples, absor??o de ?gua, DSC e TG. A condutividade t?rmica foi medida por um equipamento modelo KD2Pro que inclui uma fonte de calor linear e uma temperatura elementar de medi??o com uma resolu??o de 0,001oC. Para os ensaios de perdas de massa em fun??o do tempo e da temperatura, os blocos solo-cimento foram colocados no interior de uma c?mara quente instrumentada com 10 termopares, sendo 4 inseridos no bloco solo-cimento de refer?ncia e no bloco solo-cimento com 5% de MMFs, ligados a um data logger modelo Agilent 34970a com aquisi??o de dados de 20 canais de medi??o de tens?o AC, DC, resist?ncia, frequ?ncia, per?odo e temperatura direta com termopar programado para fazer uma leitura a cada 30 segundos. Os blocos solo-cimento com MMFs produzidos apresentaram resist?ncia mec?nica os valores obtido, superiores aos normativos pela ABNT, taxa de porosidade em torno de 10% e boas propriedades t?rmicas. At? aproximadamente 100?C, n?o foram verificadas perdas de massa nos blocos com MMFs. / The production of materials such as soil cement blocks from a raw material abundant, as the soil is a strong tool for the eventual solution of an emerging global problem, the increased demand for large sections of the population for better conditions villas. Meeting these needs within the current patterns of consumption can be translated by the economic application of soil cement blocks with MMFs in homes by offering good mechanical strength, thermal comfort and ease in obtaining. This work has as main objective the production of soil cement blocks with good mechanical and thermal properties. To this material was developed as follows: starting from the study of physical and chemical properties and morphology of the clayey soils of semiarid (Brazil) and Alentejo (Portugal). Initially, there is the semi-arid soil that was made without and with addition of 10% sand, 04, and then the clay soil Aletenjo which was produced without and with addition of 30% also with sand 04. For both clay soil studied, sand was added to adjust them to the recommended standards of ABNT in the manufacture of soil cement block. The performance of the mortars with addition MMFs, paraffin to manufacture soil cement blocks, percentages by weight of nparaffin, eicosane, 37 ? C melting point paraffin, and 120/ 130F, melting point 50 , 3c and paraffin sasolwax melting point 57?C, were added to the constituents of the mortar, the MMFs are called "smart" materials for adju
sting the right set temperature. Then two mortars were produced, one with the clayey soils in Brazil (9 wt% cement; 9.63 wt% water, 0%, 3% and 5% w MMFs) and the other with clay soil Alentejo (9 wt% cement, 10 wt% water, 0% to 5% MMFs). After mixing the mortar was compressed with a manual press capacity 2MPa pressure in order to stabilize and to form soil cement blocks. Finishing the production process, with the cure of the material. In the final product were carried out the mechanical resistance and thermal properties (compressive, specific heat, latent heat, conductivity, strength and thermal capacity, immersion and capillary water) in addition, the material was characterized by fluorescence, SEM, DSC, TG. And the tests were performed in clayey soil: X-ray fluorescence, bulk density, true density, particle size, screening, sedimentation and Proctor test. With the trials were possible to produce soil cement blocks with good mechanical strength and thermal properties.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/20375 |
| Date | 10 April 2015 |
| Creators | Dantas, Valter Bezerra |
| Contributors | 05012180410, http://lattes.cnpq.br/9858094266525225, Nascimento, Rubens Maribondo do, 80732810400, http://lattes.cnpq.br/8671649752936793, Silva, Angelus Giuseppe Pereira da, 30814111491, http://lattes.cnpq.br/1435330862718379, Silva, Ariadne de Souza, 00735940401, http://lattes.cnpq.br/5623381698478389, Holanda, Jos? Nilson Fran?a de, 46635580468, http://lattes.cnpq.br/5678722013385478, Gomes, Uilame Umbelino |
| Publisher | Universidade Federal do Rio Grande do Norte, PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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