Bitumen / Filler Interactions

Bitumen / filler interactions Current understanding and perspectives Didier Lesueur - [email_address] Chemo-Mechanics of Bituminous Materials – Washington DC – Jan. 10th, 2010

Content ,[object Object],[object Object],[object Object],[object Object]

Definitions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Particle sizes of typical mineral fillers W: Limestone D: Dolomite M: Melaphyre B: Basalt CAL: Hydrated Lime from Grabowski et al., Proc. Mairepav6, 2009 CAL M D B W

Dry compacted porosity of mineral fillers (Rigden air voids - EN 1097-4) L: Limestone D: Dolomite M: Melaphyre B: Basalt CAL: Hydrated Lime from Grabowski et al., Proc. Mairepav6, 2009

Stiffening effect measured by delta Ring&Ball (EN 13179-1) L: Limestone D: Dolomite M: Melaphyre B: Basalt CAL: Hydrated Lime from Grabowski et al., Proc. Mairepav6, 2009 CAL: too stiff to measure!!

Stiffening effect correlated with Rigden air voids from Vansteenkiste + Vanelstraete, AAPT, 2008 L D M B

The stiffening effect of mineral filler: A volume fraction effect ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The stiffening effect of mineral filler: The Einstein equation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The stiffening effect of mineral filler ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The stiffening effect of mineral filler from Quemada, Rheol. Acta 16, 1977 linear (Einstein) maximum packing

The stiffening effect of mineral filler from Heukelom + Wijga, AAPT, 1971 ,[object Object],[object Object],[object Object],[object Object]

The stiffening effect of various fillers from Lesueur, Adv. Colloid Interface Sci. 145, 2009 [  ] above the usual 2.5-5 value

Why do fillers have these intrinsic viscosities? Table data from Landau + Lifschitz, Fluid Mechanics, 1958 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],a b

Why do hydrated lime stiffen more than mineral fillers? ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Why do hydrated lime behave differently than usual mineral fillers? mineral filler hydrated lime 35% air voids 65% air voids

What is the effect of particle size? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

What is the effect of particle size? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusions and perspectives: Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Conclusions and perspectives: Research needs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Bitumen / Filler Interactions

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