Rationale

Add ASTM C1231/C1231M Practice for Use of Unbonded Caps in Determination of Compressive Strength of Hardened Cylindrical Concrete Specimens to Referenced Documents Section 2.1. Revise Section 10.8 to add C1231/C1231M as an approved capping method. Revise Note 14 to include C1231/C1231M and provide specific guidance for measuring steel retainers.