Properties of Foamed Asphalt for Warm Mix Asphalt Applications (2015) / Chapter Skim
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Pages 74-77
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74 HMA is a well-established paving material with over 100 years of proven performance. High temperatures [275°F (135°C)
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75 • For most binders, FI decreased with water content; that is, at higher water contents, the area under the ER versus time curve was smaller due to the instability of the binder. • For most binders, SAI decreased with water content; that is, larger bubbles with a faster foam collapse (larger k-value)
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From page 76... ...
76 • WMA mixtures produced at 1.0% foaming water content had better workability and coatability characteristics as compared to the control HMA, while WMA mixtures foamed at higher foaming water contents (i.e., 2.0% and 3.0%) had equivalent or worse characteristics as compared to the control HMA when mixed and compacted at the same temperatures.
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From page 77... ...
77 Figure 5-1. Final recommended foamed asphalt mix design method.
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