Servicios Personalizados
Revista
Articulo
Indicadores
Citado por SciELO
Accesos
Links relacionados
Citado por Google
Similares en SciELO
Similares en Google
Compartir
DYNA
versión impresa ISSN 0012-7353versión On-line ISSN 2346-2183
Resumen
ALVAREZ, ALLEX E.; MACIAS, NELKIN y FUENTES, LUIS G.. ANALYSIS OF CONNECTED AIR VOIDS IN WARM MIX ASPHALT. Dyna rev.fac.nac.minas [online]. 2012, vol.79, n.172, pp.29-37. ISSN 0012-7353.
Warm mix asphalt mixtures (WMA) are asphalt mixtures produced at reduced temperatures, as compared to conventional hot mix asphalt (HMA). Temperature reductions in the order of 10 to 50 °C are possible through the incorporation of diverse WMA-type additives. However, different aspects, including the mixture internal structure of WMA, are still an object of research. Consequently, this paper focuses on the assessment of the internal structure of WMA (computed in terms of the connected air voids (CAV) characteristics), fabricated using three WMA additives: Asphamin®, Sasobit®, and Evotherm®. The CAV content corresponds to the fraction of air voids (AV) forming connected paths in a compacted specimen and is better related to the asphalt mixture response (e.g., permeability) than the total AV content. The CAV analysis was based on X-ray computed tomography scanning and subsequent image analysis. Corresponding results suggest the need for additional research to further characterize field compacted mixtures, produced at densification levels comparable to those achieved in the laboratory. In addition, the inclusion of WMA additives and corresponding temperature reductions did not substantially affect the internal structure of gyratory-compacted specimens (115 mm in height) produced for laboratory mixture evaluation.
Palabras clave : warm mix asphalt (WMA); connected air voids (CAV); X-ray computed tomography (X-ray CT); internal structure; hot mix asphalt (HMA).