Compressive strength testing of cores is often used to determine if provided concrete meets the stated specifications. Test results are never perfect, however these are used to accept or reject materials. From a quality control perspective, the consumer’s risk is if the test results indicate the material is good, but the true state of the material is not acceptable. The alternative situation is known as the producer’s risk, where the test results are not good, although the true state of the material is acceptable. The decision process must balance the risks of both the producer and consumer. Also, there are requirements and guidelines provided in ACI 318-11, “Building Code Requirements for Structural Concrete and Commentary,” and ACI 214.4R-10, “Guide for Obtaining Cores and Interpreting Compressive Strength Results.”

This presentation, Getting to the Core of Core Testing, was presented by Dr. Michael Bartlett, FACI, at the ACI Spring 2011 Convention. A free ACI Web Session of this presentation is available at the ACI Web Sessions page at