Foamed Bitumen Characterization Techniques
Abstract
In soil stabilization and pavement recycling, the expansion ratio and half-life parameters
have been considered to defne foamed bitumen quality relatively well. However, when applying
foamed bitumen technology in the production of warm mixtures, these properties are determined
to be insufcient to characterize the foam and guarantee complete aggregate coverage from the
bitumen, adequate workability, and easy mixture compaction, together with appropriate mixture
behavior 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 at
the Julio Garavito Colombian School of Engineering to characterize foamed bitumen produced in
the WLB-10S laboratory foamed bitumen plant. These techniques include invasive measures, such
as 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 each
technique by revealing some results from the measurements obtained through their application.
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