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ASTM C31 states that for acceptance testing for specified compressive strength, cylinders shall be 6×12 inches, or when specified:

A. 2×4 inches
B. 3×6 inches
C. 4×8 inches
D. 5×10 inches

Answer :

Final answer:

In the ASTM C31 standard for testing compressive strength, the usually specified cylinders size is 6x12 inch. However, when a different size is specified, the correct one would be 4x8 inch.

Explanation:

The ASTM C31 standard refers to making and curing concrete test specimens in the field. For compressive strength tests, the cylinders are typically specified to be 6x12 inches. When other dimensions are specified, the correct one according to ASTM C31 would be the 4×8 inch cylinders, not 2x4, 3x6, or 5x10 inches.

The test is to assess the solidity of materials under squeezing pressures.

The concrete's ultimate compressive strength is generally 20 × 10⁶ N/m², thus the blocks are unlikely to shatter or corrode, given the compression levels they are subjected to during this testing procedure. However, because its ultimate shear strength is merely 2 × 10⁶ N/m², care should be taken as fragments may detach under informational stress

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