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  1. EricU

    Why specify 3,000 lb concrete but only require 2,500 lb

    I am a Civil PE in Northern California and we have always specified on our plans the following; Use 3,000lb concrete, f'c = 2,500 used for design therefore no special inspection required. A friend recently asked me if we are only designing using a compression strength of 2,500 lbs., then why...

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