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Re: Lateral Pressure

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ACI 347 gives formulas for lateral pressure on formwork, depending upon rate 
of placement and based on a set of assumed parameters.  As a maximum, the 
equivalent fluid pressure (EFP) need not exceed 150 pcf.  For mixes outside 
the given parameters, the wet unit weight is to be used as the EFP.  Thus 
regardless of the fluidity of the mix, it appears that 150 pcf EFP can 
conservatively be used for normal weight concrete.