New Jeddah circuit

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ringo
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Re: New Jeddah circuit

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Given it's the hot middle east, I am sure the oil would dry out quickly.
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AriaanGert
AriaanGert
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Re: New Jeddah circuit

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ringo wrote:
Sat Nov 27, 2021 3:52 am
Given it's the hot middle east, I am sure the oil would dry out quickly.
I thought is oil in ground everywhere in that region. Not dried out yet.

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Mogster
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Re: New Jeddah circuit

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Surely the 35°C daytime air temperature and reliable sunshine will dry the oil off.

pb6797
pb6797
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Re: New Jeddah circuit

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Cured, or dried? I was under the impression that while asphalt will dry in a few days it takes several months to fully cure and achieve full strength. Can you water blast asphalt that is only dry and hasn't had time to cure, or will you just rip chunks of it up?

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siskue2005
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Re: New Jeddah circuit

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pb6797 wrote:
Sat Nov 27, 2021 4:42 pm
Cured, or dried? I was under the impression that while asphalt will dry in a few days it takes several months to fully cure and achieve full strength. Can you water blast asphalt that is only dry and hasn't had time to cure, or will you just rip chunks of it up?
Old photo from october
Image
they had already laid the asphalt in September
so I don't think it will be a problem

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Wouter
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Re: New Jeddah circuit

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siskue2005 wrote:
Sat Nov 27, 2021 6:07 pm
pb6797 wrote:
Sat Nov 27, 2021 4:42 pm
Cured, or dried? I was under the impression that while asphalt will dry in a few days it takes several months to fully cure and achieve full strength. Can you water blast asphalt that is only dry and hasn't had time to cure, or will you just rip chunks of it up?
Old photo from october
https://pbs.twimg.com/media/FDA_qbcWQAE ... name=small
they had already laid the asphalt in September
so I don't think it will be a problem
That was the first very small piece of track that was provided with the first layer.
The last part was only paved last week.

Wouter wrote:
Fri Nov 26, 2021 4:18 pm
GT: The latest info from AMuS:
“For Jeddah, the last layer of asphalt was laid last week !! Tilke thinks the track will be fine, :shock:
but everything else will look tentative. "

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f1jcw
f1jcw
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Re: New Jeddah circuit

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siskue2005 wrote:
Sat Nov 27, 2021 6:07 pm
pb6797 wrote:
Sat Nov 27, 2021 4:42 pm
Cured, or dried? I was under the impression that while asphalt will dry in a few days it takes several months to fully cure and achieve full strength. Can you water blast asphalt that is only dry and hasn't had time to cure, or will you just rip chunks of it up?
Old photo from october
https://pbs.twimg.com/media/FDA_qbcWQAE ... name=small
they had already laid the asphalt in September
so I don't think it will be a problem
No walls there, I prefer it

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ringo
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Re: New Jeddah circuit

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The cars are very light. I do not think they will cause any major damage. Usually asphalt takes years of abuse by heavy trucks and traffic as well as rainfall snow etc.
20 super light cars driving over the track on soft tyres for a weekend should not be a problem I think.
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NathanOlder
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Re: New Jeddah circuit

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ringo wrote:
Sat Nov 27, 2021 9:42 pm
The cars are very light. I do not think they will cause any major damage. Usually asphalt takes years of abuse by heavy trucks and traffic as well as rainfall snow etc.
20 super light cars driving over the track on soft tyres for a weekend should not be a problem I think.
Don't be so sure, year after year the MotoGP riders complain about track surfaces on tracks they share with F1 races. The F1 cars put ripples in the surface where they move the asphalt. Don't forget 200+mph with tonnes of downforce and heavy braking on surfaces that get very very hot in the summer sun.

Edit ; here are some exxamples

https://the-race.com/motogp/is-qatars-f ... or-motogp/

https://www.racefans.net/2017/09/07/mot ... cks-bumpy/
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SiLo
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Re: New Jeddah circuit

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The sand in the region will help in massively absorbing and carrying away any of the oils that remain on the surface of the track.
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PlatinumZealot
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Re: New Jeddah circuit

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These places tend to have a high amount of crushed granite in the asphalt too. Very grippy.
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dans79
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Re: New Jeddah circuit

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For all we know, they might plan on chemically cleaning the track before the weekend arrives!
183 103 103 7

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dans79
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Re: New Jeddah circuit

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I found this paper that discusses a method of curing a track faster!
http://ascpro0.ascweb.org/archives/cd/2 ... 002016.pdf
Although there is not a proper method to effectively measure the cure rate of fresh HMA pavement, it is generally
agreed hardening normally last 12 months after paving (Chen and Huang, 2000). While ordinary vehicles can be
driven at reasonable speed on a fresh HMA surface, no race cars or motorcycles should be run on the newly paved
surface. It was recommended minimum cure time of 60 day is necessary after paving, depending on temperature,
thickness, mix type and other conditions.
Note that motorcycles are as damaging as any race car due to the high
power/tire footprint ratio, which causes bike tires to cut through the surface more easily than a wider car tire. In
cold areas in Canada, it is recommend that the track surface be allowed a full winter of cure time. To reduce the
cure time, hydrated lime was spread after HMA was placed and rolled. The application rate for the hydrated lime
was 80 to 100 grams/m2 of pavement surface area.
The hydrated lime should meet the requirements in ASTM 0207:
Specifications for Hydrated Lime for Masonry Purposes. Mete-R-Matic XL top dresser, with an extra-large capacity
hopper, was used to apply hydrated lime. This equipment has been known for its uniform application of top
dressing and its simple, easy-to-use design. Other similar equipment can also be used. Application rate can be set
and go with confidence that each pass will be the same as the last. The hydrated lime should be brushed into the
surface with hard brushes so that the lime gets into the open pores of the mix where it will react with liquid asphalt
cement to help dry it out.
Rubber tired rollers were used to draw excess asphalt cement from the surface. This
rolling took place for several days after paving was complete. The applied hydrated lime was consistently rolled
into the asphalt pavement surface with multiple passes of light, unballasted, rubber-tired rollers. The hydrated lime
application and rolling process was repeated, as necessary, to achieve a uniform “off-white” surface color condition.


The pavement stiffness was significantly improved by this operation. As a result, the race car track was opened
approximately one week after the completion of paving, approximately six months earlier than originally scheduled.

Figures 10 and 11 show the hydrated lime was uniformly spread onto the surface of the asphalt pavement and the
tire mark made to test the strength and stiffness of the fresh pavement. The circle in the middle of the picture shows the tire mark left by the strength test, turning the front wheel of a fully loaded 18 thousand pounds truck several
times on the newly paved surface. The lime-modified pavement successfully passed the strength test.
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pb6797
pb6797
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Re: New Jeddah circuit

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Wow, thank you for that. Sounds like they may have to get out there to finish off the surface. Could be pretty tight, one week is mentioned in that paper and they will have had just a week after finishing the last bit of the circuit.

If the track has wild variations in grip, texture, smoothness etc. as it settles down that could make this weekend even more unpredictable. All good fun,

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_cerber1
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Re: New Jeddah circuit

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