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Re: Running on tarmac vs concrete [jaretj] [ In reply to ]
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Yep, both surfaces are sufficiently hard enough that there’s no difference when it comes to running, neither will deform.
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Re: Running on tarmac vs concrete [zedzded] [ In reply to ]
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In general I would agree that most days there would be no difference between asphalt and concrete pavement. However, in the right conditions the asphalt binder may soften and it may not be a largely discernable difference while running over a 3 hr run that many strides even on the slightest of pavement difference could have a cumulative effect.

During compaction of asphalt generally anything below 140 degrees the asphalt is cooled. So let's say on a hot day with full sun on a IM course it is entirely possible that the binder has started to soften.
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