Obtenção de emulsões asfálticas convencionais e modificadas com argilas e nanoargilas
The increasing demand for asphalt leads to the development of techniques that can improve the quality of products and increase the useful working life of pavements. Consequently, there is a growing application of asphalt emulsions, which are produced from a mixture of petroleum asphalt cement (CAP)...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15850 |
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| Resumo: | The increasing demand for asphalt leads to the development of techniques that can
improve the quality of products and increase the useful working life of pavements.
Consequently, there is a growing application of asphalt emulsions, which are produced from a
mixture of petroleum asphalt cement (CAP) with an aqueous phase. The main advantage of
asphalt emulsions is its cold application, reducing energy costs. Conventional emulsions are
obtained using asphalt, water, solvent, and additives. The modified asphalt emulsion is
developed by adding a modifying agent to conventional emulsions. These modifiers can be
natural fibers, waste polymers, nanomaterials. In this work modified asphalt emulsion were
obtained using organoclays. First, it was prepared a conventional asphalt emulsion with the
following mass proportion: 50% of 50/70 penetration grade CAP, 0.6% of additives and 3%
of emulsifier, 20% of solvent and 26.4% of water. It was used bentonite and vermiculite (1%
and 4%) to obtain the modified asphalt emulsion. Bentonite and vermiculite were added in its
raw state and as an organoclay form and as an organoclay-acid form, resulting in 26
experimental runs. The methodology described by Qian et al. (2011), with modifications, was
used to obtain the organoclay and the organoclay-acid form. infrared spectroscopy (IR)) were
used to characterize the clays and nanoclays. The emulsions were prepared in a colloidal mill,
using 30 minutes and 1 hour as mixing time. After, the emulsions were characterized. The
following tests were performed, in accordance with the Brazilian specifications (DNER-
369/97): sieve analysis, Saybolt Furol viscosity, pH determination, density, settlement and
storage stability, residue by evaporation, and penetration of residue. Finally, it can be
concluded that the use of nanoclays as asphalt modifiers represent a viable alternative to the
road paving industry |
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