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Usually.5MPa but it is better to check project specification.
Standard mixing is 1 bag cement 2 bucket of gravel 3 bucket of sand
10mpa to 15 mpa for concrete strenght
3000 psi grout strength of Hollow blocks after minimum 28 days
base on the standard it should be class AA 1 cement 11/2 sand and 3 gravel or agrregates.
ALL YOU NEED IS 1:3 MIXTURE AND BE SURE THE CEMENT GROUT IS WELL MIX TO AVOID VACUUM.