Abstract
AbstractThe adsorption of asphalt on aggregate surfaces was studied by several experimental methods by the Bureau of Mines. The adsorption rate of asphalt on an aggregate surface was found by flowing asphalt through a column of aggregate and measuring the decrease in flow rate. Photomicrographs revealed a striated structure in the asphalt region near the asphalt–substrate interface. The photomicrographs suggest that, as asphalt molecules are adsorbed on substrates, the postulated large, sheet‐like molecules are aligned perpendicular to the interface. Perpendicular orientation of asphalt molecules near the interfacial region is also supported by evidence of dipole fields produced by the alignment of the asphalt dipoles. Contact angle measurements of 1‐bromonaphthalene on asphalt surface in prior contact to a mica surface further supports interfacial structuring. A multilayer adsorption mechanism, with preferred orientation of asphalt molecules on the aggregate surface, is proposed as an explanation of the observations.
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