[Talk-us] surface=chipseal vs surface=asphalt

[Kerry Irons]

"Old chip seal" can look very much like asphalt if the organic portion has a relatively lower softening temperature such that the stones get mushed into the tar and make what seems like "asphalt in situ."  If the organic portion has a high softening temperature, the stones will remain more on the surface and you can obviously tell that the road was chip sealed.  The definition of high or low softening temperature will obviously depend on the local climate.  A chip seal formulation applied in upper Michigan that would never allow the stones to sink in would turn into a sticky mess if used in the desert southwest.


Kerry Irons
Adventure Cycling Association

-----Original Message-----
From: Mark Wagner <mark+osm at carnildo.com> 
Sent: Sunday, January 24, 2021 4:11 PM
To: talk-us at openstreetmap.org
Subject: Re: [Talk-us] surface=chipseal vs surface=asphalt

On Sat, 23 Jan 2021 19:20:35 -0500
Richard Welty <rwelty at averillpark.net> wrote:

> On 1/23/21 5:48 PM, Chuck Sanders wrote:
> > Chipseal, asphalt, and concrete are three very different paving 
> > materials, with very different characteristics and behavior.
> > 
> > From a road engineering perspective, being able to query our 
> > inventory database for exactly how much of each we have in a given 
> > area is absolutely critical.
> 
> > On Sat, Jan 23, 2021, 11:52 Mateusz Konieczny via Talk-us 
> > <talk-us at openstreetmap.org <mailto:talk-us at openstreetmap.org>>
> > wrote:  
> 
> >     Is it something considered as substantially different from 
> > regular asphalt concrete?
> > 
> >     Is surface=chipseal valid value or pointless duplicate of
> >     surface=asphalt?
> >  
> 
> i agree with Chuck. the town road in front of my house is chipseal, 
> not asphalt. they are distinctly different and not hard to tell apart 
> once you know what to look for.
> 
> riding a bicycle on fresh asphalt can be quite nice. riding a bicycle 
> on fresh chipseal is literally riding on a layer of fresh gravel 
> that's been dumped on top of fresh sealer. i avoid it.

How do you tell old chipseal from old asphalt?  There's a road near me that the county maintenance department says was chipsealed five years ago.  I haven't tried bicycling on it, but as a driver and pedestrian, I can't tell it from any other paved road of similar age.

--
Mark

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