Title: Concrete Q&A: Field- versus Standard-Cured Cylinders made from High-Strength Concrete
Publication: Concrete International
Appears on pages(s): 64
I’m a technician with a testing laboratory. On one of my projects, I understand that the specified strength is 10,000 psi (68.9 MPa), based on compressive tests of field-cured cylinders. For quality assurance, we are also testing standard-cured cylinders. The field-cured cylinders are consistently breaking at strengths that are 25 to 35% lower than the standard-cured specimens. Why such a difference in strength?