Mix ratio for filling blocks

Postby russ01 » Sun Aug 02, 2009 6:02 pm

I have foundation walls built from 12"x16"x8" to hold a 12'x14' wooden shed. I want to fill the block with concrete. I'm mixing my own concrete but dont know how strong to make the mix. What ratio of sand, cement, water should i use for the mix for filling the block?

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