ASTM C67 Testing of Brick and Structural Clay Tile

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ASTM C67 Testing of Brick and Structural Clay Tile

ASTM C67 covers procedures for testing brick and structural clay tile, including modulus of rupture and compressive strength. Full-size bricks, tiles, or solid masonry units can be used as test specimens.


ASTM C67 tests include:

  • modulus of rupture
  • compressive strength
  • absorption
  • saturation coefficient
  • effect of freezing and thawing
  • florescence
  • initial rate of absorption and determination of weight
  • measurements for size, warpage, length change, and void area

Testing procedure

When testing with ASTM C67, choose specimens that are representative of the entire unit and free of dirt, mud, mortar, or other foreign materials unassociated with the manufacturing process. Next, prepare your specimens according to the standard. For measuring the modulus of rupture, compressive strength, abrasion resistance, and absorption determination for bricks, at least ten individual bricks shall be selected for lots of 1,000,000 or less. For the weight determination and for compressive strength and absorption tests of structural clay tiles, at least five tiles should be tested from each lot of 250 tons (226.8 Mg) or fraction thereof.

For the flexural test or modulus of rupture, apply a load in the direction of the depth of the unit using a testing machine. The rate of loading should not exceed 2,000 lbf (8,896 N)/min. For the compressive strength test, test your brick specimens flatwise. Apply the load up to one half of the expected maximum load, at any convenient rate, after which, adjust the controls of the machine so that the remaining load is applied at a uniform rate.

An electromechanical universal testing machine can be used for testing for flexural and compressive strength. Give one of our application engineers a call today for help with creating the best budget and testing plan according to ASTM C67.