Estudo de misturas asfálticas mornas em revestimentos de pavimentos para redução de emissão de poluentes e de consumo energético. / Study of warm mixes asphalt as a pavement surface for reducing polluants emissions and energy consumption.

AUTOR(ES)

Rosângela dos Santos Motta

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

30/05/2011

RESUMO

In the last years there has been an increasing concern for the environment. In this context, warm mixes asphalt was developed with positive impact not only on the environmental pollution, but also on the energy consumption, due to the reduction of mixing and compaction temperatures. This work compares the behavior of warm mixes asphalts (with surfactant additive) with similar hot mixes asphalt (conventional ones), through compaction and mechanical properties, as well as additional tests, in laboratory. The results indicate that it is not necessary to change the conventional asphalt mix design for warm mixes, and also that the optimum asphalt content in the warm mixes should be maintained similar to the hot mixes. However, the results are dependent on the asphalt type, the asphalt content, and the level of mixing and compaction temperature reduction. The temperature control and the magnitude of its reduction are essential for the final quality of the warm mix in this technology. Besides, two test tracks were monitored, where there were no additional difficulties during the mixing procedure and in the construction site. The results of the field control and the evaluation of the pavement surface in the warm mix test tracks were similar to the hot mix techniques. Pollutants emissions (priority PAH on the particulate matter) from warm and hot mixes asphalt mixes were analyzed, in the laboratory, in the mixing plant and in the field, during one of the test tracks construction. The results demonstrated that there was a reduction of about three times on the total amount of these pollutants with the warm mixes. Visually, it was also verified that there was a large reduction of asphalt fumes with the warm mix in the field. Finally, it was estimated that there are significant energy savings when reducing drying and heating temperatures of the aggregates in the mixing plant with warm mixes. Thus, this work shows, through the physical and mechanical properties evaluated in the laboratory and in the field, that the quality of warm mixes is similar to the hot mixes, with the benefits of reducing pollutant emissions and saving energy.

ASSUNTO(S)

asphalt mixes energia (redução) energy (reduction) misturas asfálticas misturas mornas pavimentação paving polluants (reduction) poluentes (redução) warm mixes asphalt

Documentos Relacionados

• Estudo de misturas asfálticas de módulo elevado para camadas estruturais de pavimentos
• Secagem de caqui em condições controladas : efeito sobre a qualidade do produto e consumo energetico.
• Propriedades mecânicas de misturas asfálticas mornas com adição de zeólitas sintetizadas
• Misturas asfálticas mornas : verificação da fadiga e do módulo complexo
• Características funcionais e mecânicas de misturas asfálticas para revestimento de pavimentos aeroportuários