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Why Is Concrete Better?

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Old 03-05-2012, 11:43 AM   #1
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Question Why Is Concrete Better?

So one of my local tracks is being redone as I type this. They plan to open late this month. Their former track surface was your typical street style asphalt. It worked, but traction was always an issue for me. They are redoing the track with either 60', 700', or the full 1/4 mile in concrete. I have been told concrete provides better traction, but I am curious as to the reasons behind this - any links or info would be great. Thanks!
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Old 03-05-2012, 11:45 AM   #2
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I have heard the same and I have a few good Ideas why but I am sure some experts will chime in and you will get your answer.

But def a good question for the forum!
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Old 03-05-2012, 11:55 AM   #3
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asphalt moves if you hook. concrete is alot more stable
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Old 03-05-2012, 12:20 PM   #4
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Concrete holds rubber better than asphalt. Rubber from burnouts, etc gets laid down and makes for better traction but, if you get out of the "groove" on a concrete track, where there is no rubber, traction is worse than asphalt. So, stay in your lane and go straight. Hope this makes sense.
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Old 03-05-2012, 12:53 PM   #5
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Several benefits, the largest being it's stability, it is far more rigid even compared to an asphalt pavement designed for it. Have you ever noticed in high traffic areas - typically approaching a stop light - you get rutting and a ripple effect in the pavement? This is the asphalt actually moving between layers (e.g., base, binder, top)

As a Civil Engineer I design roads all the time, there are several different grades of asphalt with different types types of coefficients of friction use for a top coarse - typically a type 7 or type 6 if it isn't a superpave type. Depending on the concrete mix and how it was finished it can also have a different coefficient of friction which can be dialed in for a more aggressive friction type. We typically use a coefficient of friction to analysis the necessary degree of superelevation (banked slope on a turn) and the necessary distance for stopping - usually designed for wet conditions and bald tires in mind.
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Old 03-05-2012, 12:56 PM   #6
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^^^ pretty good read.
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Old 03-05-2012, 04:21 PM   #7
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Quote:
Originally Posted by BanditTA View Post
Several benefits, the largest being it's stability, it is far more rigid even compared to an asphalt pavement designed for it. Have you ever noticed in high traffic areas - typically approaching a stop light - you get rutting and a ripple effect in the pavement? This is the asphalt actually moving between layers (e.g., base, binder, top)

As a Civil Engineer I design roads all the time, there are several different grades of asphalt with different types types of coefficients of friction use for a top coarse - typically a type 7 or type 6 if it isn't a superpave type. Depending on the concrete mix and how it was finished it can also have a different coefficient of friction which can be dialed in for a more aggressive friction type. We typically use a coefficient of friction to analysis the necessary degree of superelevation (banked slope on a turn) and the necessary distance for stopping - usually designed for wet conditions and bald tires in mind.
Couldn't say it better
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Old 03-05-2012, 05:22 PM   #8
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You must be talking Cecil County Dragway
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Old 03-05-2012, 05:31 PM   #9
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Thanks for the info, guys!


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Originally Posted by Doug G View Post
You must be talking Cecil County Dragway
Yes sir. Can't wait 'til it opens!
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Old 03-05-2012, 07:35 PM   #10
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Gotta get my LY6 clone to the machine shop and then it won't be long (I hope)

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Due to our resurfacing project the track will be closed for approximately 2 or 3 more weeks. We are hoping to be open by March 30th.
http://www.cecilcountydragway.com/index.shtml
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Old 03-06-2012, 08:19 AM   #11
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Quote:
Originally Posted by Doug G View Post
Gotta get my LY6 clone to the machine shop and then it won't be long (I hope)



http://www.cecilcountydragway.com/index.shtml
Yep, I was talking to Jim (the owner) over on Yellow Bullet. Can't wait.
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Old 03-09-2012, 04:26 AM   #12
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More pics are up on YB
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Old 03-09-2012, 08:15 AM   #13
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.

I read a story years ago about the difference.
They had close up photo's and showed that concrete had a much higher contact area.
Even with the naked eye you can see there is more air gaps between the tiny pebbles.
It's even more evident when they do the magnification comparison.

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