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Key Words: porous asphalt,top-coat for porous asphalt,voids blocking,drainage function,surface free energy

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The functional effect of top-coat system for porous asphalt

Masaru OHMICHI,Osamu NAKAGAWA,Hiroshi YAMANOKUCHI,Teruhiko MARUYAMA

The studies made so far on the top-coat system with MMA type resin for porous asphalt have proven the effect of the system on improvement of permeability of porous asphalt and its capability for reducing deposition blocking up the voids. This effectiveness simply attributed to the difference of tackiness between asphalt binder and MMA type resin. However it was hypothesized that this effect would be developed by the difference in surface free energy ($B&C(Bs) between top-coat materials and asphalt binders.Therefore some porous mixes were prepared using different binders having different$B&C(Bs values, then the changes in permeability were measured by repeatedly filling the voids with slurry, and the effects of$B&C(Bs of the binder were examined$B!%(B

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