SUPERPAVE Digest 196
Topics covered in this issue include:
6) need opinions on Voids Total Mix
by
9) Re: need opinions on Voids Total Mix
by "Christopher Bacchi" <>
12) Re: need opinions on Voids Total Mix
by
13) Re:need opinions on Voids Total Mix
by "Richard L. Bradbury" <>
15) Re: need opinions on Voids Total Mix
by
· To:
· Subject: need opinions on Voids Total Mix
· From:
· Date: Fri, 18 Jun 1999 11:11:31 EDT
Hypothetically, lets choose a 19.0 mm SUPERPAVE mix to be placed at a depth
of 50 mm to 100 mm in a pavement structure designed for 0.3 to 3.0 Mill
ESAL's. Let's also assume that all field conditions are ideal and that all
rolling is performed correctly (this is a BIG assumption).
In Your opinion, which of the following voids criteria would give you
a better HMA product?
#1 VTM = 3.5% (% passing #200 = 5.0%)
#2 VTM = 4.5% (% passing #200 = 4.4%)
Please assume the mixes are exactly the same with the exception of the %
passing the #200 sieve.
I would really appreciate anyone's opinion on this matter.
Thank you
Mike S. (202-635-3716)
Fort Myer (Washington DC)
· To:
· Subject: Re: need opinions on Voids Total Mix
· From: "Christopher Bacchi" <>
· Date: Fri, 18 Jun 1999 13:38:15 -0400
We feel that the 4.5% void mix would be better. It should be less likely to
rut and should also be somewhat stiffer due to less 200 material....
Chris Bacchi
NCDOT
· To:
· Subject: Re: need opinions on Voids Total Mix
· From:
· Date: Fri, 18 Jun 1999 13:40:15 -0500
My vote is for option 2.
You may find that option 1 is more workable. We expect 94% roadway density with
1% total average variance and none over 2% variance from density.
· To: ,
· Subject: Re:need opinions on Voids Total Mix
· From: "Richard L. Bradbury" <>
· Date: 18 Jun 1999 15:31:50 -0400
Theoretically, I say probably No. 2 is better. Realistically, I'm not sure you'd
see much difference on the road.
· To:
· Subject: Re: need opinions on Voids Total Mix
· From:
· Date: Fri, 18 Jun 1999 19:11:50 EDT
we just put down 1500 tons of 19mm with 4.5 design voids. Looks very open but
should resist rutting (fingers Crossed)
SUPERPAVE Digest 198
Topics covered in this issue include:
1) Re: need opinions on Voids Total Mix
by Douglas Coleman <>
· To:
· Subject: Re: need opinions on Voids Total Mix
· From: Douglas Coleman <>
· Date: Sun, 20 Jun 1999 08:08:00 -0500
I believe no. 1 may be best for your conditions however I would make sure the
fines / % ac is less than 1.2. This mixture can be compacted in the field
to lower voids, which will reduce the changes of striping, and because your
traffic volumes are low i do not believe rutting will be an issue.
SUPERPAVE Digest 199
Topics covered in this issue include:
1) Re: need opinions on Voids Total Mix
by
· To:
· Subject: Re: need opinions on Voids Total Mix
· From:
· Date: Mon, 21 Jun 1999 10:33:29 -0400
NYSDOT has chosen to go with 4.0% VTM, so we're right in
between your two options. Of course, most of our contractors would
prefer 3.5% since this would theoretically be easier to compact in
the field. However, the -200 content (fines/AC actually) needs to be
monitored carefully.
Milt LaSalle