Page 6 - PACA - Catalog of Courses

In Person - AIA Presentations (continued)
Expect Concrete Compressive Strength
Test Results Less than Specified (1 CEU)
(Course ConCyl24)
Professionals recognize that individual
compressive strength test results can be lower
than the specified strength, f′ c. While there are
numerous reasons this might occur, one important
reason is: the standards for acceptance criteria
used in the United States are based on statistical
concepts that permit a low-test result, and it
is standard practice for concrete producers to
design concrete mixtures based on a probability
of about 10% that an individual strength test may
be less than f′ c. This is done such that the owner
benefits from an economical and sustainable
concrete mixture that complies with the ACI
318-19 and represents limited risk to structural
performance considering the use of safety and
resistance factors in design.
For More Information
The Pennsylvania Aggregates and Concrete Association (PACA) is committed to advancing knowledge and
expertise in the aggregates, cement, and concrete industries. Through our educational opportunities, we aim
to support designers, specifiers, contractors, and industry professionals with the tools they need to build
stronger, more sustainable communities.
For more information about courses, resources, or upcoming opportunities, please contact:
Susan Armstrong, Director of Specifications and Sustainability
susan@pacaweb.org
570.428.2338
pacaweb.org