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Mortar Type Parts by Volume of Portland Cement Parts By Volume of Lime M 1 0.25% S 1 over .25 to  .5 N 1 over .5 to 1.25 O 1 over 1.25 to 2.5   Mortar Type Average Compressive Strength at 28 Days Min. psi M 2500 S 1800 N 750 O 350