Crushing strength of brick and block

The compressive strength of each prepared brick / block was analysed at the age of 3, 7, 14 and 28 days using a compressive test machine by applying a crushing load.  

Brick / Blocks of thickness 75 mm or more when tested for compressive strength shall comply with the following

  1. The average crushing strength of 10 bricks shall be not less than 7.0 N/mm2
  2. The average crushing strength of 10 blocks shall be not less than 2.8 N/mm2  
                (The coefficient of variation for the sample shall not exceed 20%)

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