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Prior to performing compressive #strength #tests on #concrete specimens, it’s important to understand options for preparing the ends of compressive strength samples.

Proper end preparation ensures that the ends of the test samples have smooth, parallel bearing surfaces perpendicular to the applied axial load to assure uniform distribution of forces during testing.

ASTM C607 is a method using molten sulfur to form bonded caps. ASTM C1231 specifies the procedure to use unbonded neoprene pads in metal retaining rings.

No matter which method you choose, specific criteria should comply with ASTM C39 specifications for planeness and perpendicularity of specimens.

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