Title:
Concrete Q & A: Standards for 7-Day and 28-Day Strength-Test Results
Author(s):
Publication:
Concrete International
Volume:
25
Issue:
3
Appears on pages(s):
132
Keywords:
DOI:
Date:
3/1/2003
Abstract:
We test concrete cylinders for compressive strength. Most specifications that we see require a compressive strength of 3000 psi (20.7 MPa) and testing at 7 and 28 days. What ACI standard stipulates the percent of the specified compressive strength that the cylinder must meet in order to pass the compressive strength test at both the 7- and 28-day ages?