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RE: Concrete slump

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One additional factor that can influence slump in pumped concrete is that
batched aggregates and sand are frequently considered as 'saturated surface
dry' (ssd) in the mix design.  High line pressure can readily
super-saturate aggregates and sand reducing the free water available to
mix.   Temperature and addmix constituents are certainly factors.  Larger
lines will reduce contact friction and heat.