Bitmac directly onto geotextile??

[Dave_L]

Well this is a first for me, never seen this before!!

[lemoncurd1702]

What was the geo supposed to achieve.

[henpecked]

What was the geo supposed to achieve.

It's in case the road layout changes, they can just push it into its new position.

[GB_Groundworks]

There is a technique where geo textile is laid into hot rolled asphalt as it's laid

I once found a video and asked about it the gaffer knew about it, it's not in this case though but thought I'd add to the convo

http://youtu.be/aHVQNMxVhEI

http://youtu.be/7Vq5xWer5F8



Edited By GB_Groundworks on 1387149499

[Tony McC]

Yeh, there *is* a methodology which involves embedding a geo-grid within the blacktop, but placing a geo-textile between sub-base and the surfacing will achieve nothing more than creating a slip membrane, as Henpecked has suggested.

If I had to guess as to its intended purpose, I'll bet some fresh-outta-college highways engineer thought it would act as a weed barrier. I've seen Terram 2000 used within the sub-base as a barrier to Japanese Knot Weed and it seemed to work - well it did until the JKW emerged at the edge of the pavement!

It does make you wonder how hot was the blacktop when there's no sign of melting on the geo-textile. 190°C??? I think not!

[tarmal & Co]

Surprised it didn't melt I have seen woven geo textile in areas where there is a lot of mares tails weeds growing, laid out under the tarmac.

[Dave_L]

But weeds etc will grow up through terram!