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Previous issue date: 2012-08-03 / The main objective of this research was the development and characterization of conventional
and modified cationic asphalt emulsions. The asphalt emulsions were developed by using the
Petroleum Asphalt Cement (CAP 50-70) from Fazenda Bel?m (Petrobras -Aracati-Ce). The
first step in this research was the development of the oil phase (asphalt + solvent) and the
aqueous phase (water + emulsifying agent + acid + additives), separately. During the
experiments for the obtaining of the conventional asphalt emulsion, the concentration of each
constituent was evaluated. For the obtaining of the oil phase, kerosene was used as solvent at
15 and 20 wt.%. For the development of the aqueous phase, the emulsifying agent was used at
0.3 and 3.0 wt.%, whereas the acid and the additive were set at 0.3 wt.%. The percentage of
asphalt in the asphalt emulsion was varied in 50, 55, and 60 wt.% and the heating temperature
was set at 120 ?C. The aqueous phase in the asphalt emulsion was varied from 16.4 to 34.1
wt.% and the heating temperature was set at 60 ?C. After the obtaining of the oil and the
aqueous phases, they were added at a colloidal mill, remaining under constant stirring and
heating during 15 minutes. Each asphalt emulsion was evaluated considering: sieve analysis,
Saybolt Furol viscosity, pH determination, settlement and storage stability, residue by
evaporation, and penetration of residue. After the characterization of conventional emulsions,
it was chosen the one that presented all properties in accordance with Brazilian specifications
(DNER-EM 369/97). This emulsion was used for the development of all modified asphalt
emulsions. Three polymeric industrial residues were used as modifier agents: one from a
clothing button industry (cutouts of clothing buttons) and two from a footwear industry
(cutouts of sandals and tennis shoes soles), all industries located at Rio Grande do Norte State
(Brazil).The polymeric residues were added into the asphalt emulsion (1 to 6 wt.%) and the
same characterization rehearsals were accomplished. After characterization, it were developed
the cold-mix asphalts. It was used the Marshall mix design. For cold-mix asphalt using the
conventional emulsion, it was used 5, 6 and 7 wt.% asphalt emulsion. The conventional
mixtures presented stability values according Brazilian specification (DNER-369/97). For
mixtures containing asphalt modified emulsions, it was observed that the best results were
obtained with emulsions modified by button residue / Neste trabalho desenvolveu-se e caracterizou-se emuls?es asf?lticas cati?nicas
convencionais e modificadas. As emuls?es asf?lticas convencionais foram obtidas utilizandose
como mat?ria-prima o Cimento Asf?ltico de Petr?leo (CAP 50-70), oriundo da Fazenda
Bel?m (PETROBRAS-Aracati-CE), cedido pela LUBNOR-Lubrificantes e Derivados de
Petr?leo do Nordeste (Fortaleza-CE). A pesquisa foi iniciada com o desenvolvimento da fase
?leo (asfalto + solvente) e da fase aquosa (?gua + emulsificante + ?cido + aditivo),
separadamente. Para a obten??o da emuls?o asf?ltica convencional, a concentra??o de cada
constituinte foi avaliada. Para a fase ?leo, o asfalto foi utilizado nas concentra??es de 50, 55 e
60 %, e o solvente (querosene) nas concentra??es de 15 e 20 %. A temperatura de
aquecimento desta fase foi de 120 ?C. Para o desenvolvimento da fase aquosa, o emulsificante
foi utilizado nas concentra??es de 0,3 e 3,0 %, enquanto que o ?cido e o aditivo foram
utilizados apenas na concentra??o de 0,3 %. A concentra??o de ?gua variou de 16,4 a 34,1 %
e a temperatura de aquecimento da fase aquosa foi de 60 ?C. Ap?s o preparo de ambas as
fases, estas foram introduzidas no moinho coloidal, onde permaneceram em aquecimento e
em sistema de refluxo, durante 15 minutos. Ap?s a obten??o de cada emuls?o asf?ltica, foram
feitos os seguintes ensaios de caracteriza??o: peneiramento, viscosidade Saybolt Furol, pH,
sedimenta??o, adesividade, res?duo por evapora??o e penetra??o. Ap?s a caracteriza??o das
emuls?es asf?lticas convencionais, escolheu-se a emuls?o que apresentou resultados de
acordo com a especifica??o (DNER-EM 369/97) para, em seguida, desenvolver as emuls?es
asf?lticas modificadas. As emuls?es asf?lticas foram modificadas atrav?s da adi??o de
res?duos polim?ricos provenientes da ind?stria de bot?es e de cal?ados (sand?lia e t?nis),
localizadas no Rio Grande do Norte. Os res?duos polim?ricos foram adicionados na emuls?o
asf?ltica de 1 a 6 %. Ap?s a obten??o das emuls?es asf?lticas modificadas foram feitos os
ensaios de caracteriza??o. Conclu?da tais etapas, continuou-se a pesquisa com o
desenvolvimento de misturas asf?lticas a frio. O m?todo Marshall foi utilizado como m?todo
de dosagem destas misturas. De acordo com os resultados obtidos, conclui-se que foi poss?vel
determinar uma composi??o de emuls?o asf?ltica convencional que atendesse a alguns
requisitos presentes na especifica??o (DNER-EM 369/97). Quanto ?s misturas asf?lticas a
frio, utilizando as emuls?es convencionais, conclui-se que, para os teores de emuls?o
utilizados (5, 6 e 7 %), estas apresentaram valores de estabilidade acima do recomendado na
especifica??o. Para as misturas asf?lticas a frio, que utilizaram as emuls?es modificadas, os
melhores resultados de estabilidade foram obtidos com a emuls?o modificada com res?duo de
bot?o
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15921 |
| Date | 03 August 2012 |
| Creators | Lima, Cristian Kelly Morais de |
| Contributors | CPF:07286937391, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4783139Z0&dataRevisao=null, Leite, Ricardo Henrique de Lima, CPF:52264343400, http://lattes.cnpq.br/3801476460958779, Barbosa Sobrinho, Ariosvaldo Alves, CPF:23702338420, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4703687T7, Silva, Moacir Guilhermino da, CPF:08792690491, http://lattes.cnpq.br/7019484280783049, Barros Neto, Eduardo Lins de, CPF:59545844434, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4798645D3, Moura, Maria Carlenise Paiva de Alencar, Dantas, Tereza Neuma de Castro |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Qu?mica, UFRN, BR, Pesquisa e Desenvolvimento de Tecnologias Regionais |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | Portuguese |
| 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 |
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