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Article . 2020
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Foamed Bitumen Characterization Techniques

Authors: Campagnoli, Sandra Ximena; Estupiñan Escalante, Enrique; Soto Vargas, Javier;

Foamed Bitumen Characterization Techniques

Abstract

En la estabilización de suelos y en el reciclaje de pavimentos, se ha considerado que larelación de expansión y la vida media defnen relativamente bien la calidad de las espumas de asfalto.Sin embargo, al aplicar la tecnología de los asfaltos espumados a la fabricación de mezclas tibias,se ha visto que estas propiedades no resultan sufcientes para caracterizar la espuma y asegurarel cubrimiento completo de los agregados por el asfalto, una adecuada trabajabilidad y facilidad decompactación de la mezcla, así como un comportamiento apropiado de la mezcla en servicio. Estehecho ha motivado estudios concluyentes en la necesidad de establecer, además de la relación deexpansión y de la vida media, la curva de colapso y la distribución de tamaños de las burbujas en unaespuma de asfalto. Varios de estos estudios también recomiendan técnicas más seguras y confablespara la medida de las propiedades de la espuma. En este artículo, se resumen las técnicas que seestán explorando en los laboratorios de la Escuela Colombiana de Ingeniería Julio Garavito para caracterizar espumas de asfalto fabricadas en planta de laboratorio WLB-10S. Tales técnicas incluyenmedidas invasivas como la varilla graduada y el ensayo de colapso de la espuma de asfalto y no invasivas como el procesamiento de imágenes y el uso sensores infrarrojos. También, para mostrar el potencial de cada técnica, se presentan algunos resultados de las medidas obtenidas con su aplicación.

In soil stabilization and pavement recycling, the expansion ratio and half-life parametershave been considered to defne foamed bitumen quality relatively well. However, when applyingfoamed bitumen technology in the production of warm mixtures, these properties are determinedto be insufcient to characterize the foam and guarantee complete aggregate coverage from thebitumen, adequate workability, and easy mixture compaction, together with appropriate mixturebehavior in service. This has led to conclusive studies on the need to establish, along with the expansion and half-life relation, the collapse curve and bubble size distribution in foamed bitumen.Several studies also recommend safer and more reliable techniques for measuring foam properties.Additionally, we summarize the techniques currently being explored by the testing laboratories atthe Julio Garavito Colombian School of Engineering to characterize foamed bitumen produced inthe WLB-10S laboratory foamed bitumen plant. These techniques include invasive measures, suchas the calibrated dipstick and the foamed bitumen collapse test, along with non-invasive measures,such as image processing and using infrared sensors. Finally, the paper denotes the potential of eachtechnique by revealing some results from the measurements obtained through their application.

Country
Colombia
Related Organizations
Keywords

relación de expansión, Warm Mixtures, Asfalto espumado, mezclas asfalticas tibias, Foam Bubbles, burbujas de espuma, curva de colapso, Collapse Curve, Foamed Bitumen, Expansion Ratio, vida media, Half-Life

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green