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Re: concrete placement near construction

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There are three publications worth looking at:

    Vibrations of Concrete Structures, ACI Publication SP-60, 1979, American 
Concrete Institute

    Vibration Problems in Geotechnical Engineering, ASCE, 1985, American 
Society of Civil Engineers

    Effects of Traffic Induced Vibrations on Bridge Deck Repairs, National 
Cooperative Highway Research Program (NCHRP) Synthesis 86, 1981, 
Transportation Research Board, (National Academy of Sciences)

The vibrations by themselves are not bad for the concrete, some reports noted 
above suggest they may be beneficial.  The problems would come from ground 
settlements induced by the vibrations.  The fact that piles are being driven 
suggests that ground settlement could be an issue.  The geotechnical engineer 
should be able to address this or the contractor could assume the risk.  
Either way, the publications noted above can be reviewed to address any 
concerns about damage to the concrete itself from the vibrations.

Alan Fisher
Manager, Temporary Structures Group
Cianbro Corporation
Portland, Maine


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