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Re: fast Atlanta track

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  • Re: fast Atlanta track

    Dear Biomch-L-ers:

    Here is some extra information following Serge Van Sint Jan's

    I am not sure what the "official" thickness of the Mondo layer was
    for the Atlanta track, but I have a little "souvenir" piece of the Atlanta
    track's Mondo in my grubby little hands right here in my office, and it
    measures about 8 mm.

    The underlying layer in Atlanta generally was not concrete. Let me
    explain. In most of the track the underlying layer was asphalt, but very
    compacted. (Phil Henson tells me that the asphalt had 95% compaction, which
    is very high; many asphalting companies will say that they are unable to
    achieve that degree of compaction. I suppose that this high degree of
    compaction is achieved through the use of heavier steamrollers!? I am not
    sure what the normal degree of compaction for asphalt is --70%??) The high
    degree of compaction in the Altanta asphalt made it harder than normal
    asphalt, and was a contributing factor to the overall hardness of the track.

    The exceptions to this type of construction in Atlanta were the long
    jump and pole vault runways, in which there was no asphalt. In these areas
    the base was concrete, and the Mondo was laid directly on top of the
    concrete. Phil Henson tells me that in these areas the layer of Mondo was
    thicker than in the rest of the track. Presumably, to a certain extent the
    thicker Mondo layer helped to compensate for the extra hardness of the
    concrete underlayer. It is not clear why the engineers followed this
    different type of construction in the long jump and pole vault areas. (No,
    I have no idea what part of the track my souvenir Mondo sample came from.)

    A correction to my previous message: I said that the "rubber-like
    surface (Tartan, Rekortan, Mondo, etc.) is poured on top of the asphalt".
    Well, that is true for Tartan and Rekortan, but not for Mondo. Mondo is
    poured at the factory, and later glued onto the asphalt (or cement) base at
    the track site.

    Jesus Dapena
    Jesus Dapena
    Department of Kinesiology
    Indiana University

    Bloomington, IN 47405, USA