Active Standard: C918 / C918M - 07
In 2012, Practice C1768/C1768M was adopted as a replacement for Test Method C684. The new practice includes two methods for accelerated curing: the warm-water method (24-hr duration)and the autogenous curing method (48-hr duration). In Practice C1768/C1768M, it is stated that if accelerated curing is used in conjunction with Test Method C918/C918M, the temperature history of the instrumented companion specimens is to be recorded so that the maturity index at the time of strength testing can be determined. the purpose of this revision is to add reference to the Practice C1768/C1768M, as is appropriate. Other changes are proposed to bring the standard up to date.
Keywordscompressive strength; early-age strength; maturity; potential strength; projected strength;
Ballot Item Approved as C918/C918M-2013 and Pending Publication