Make plans to join us for our 2024 Round Robin Testing Events which bring together area laboratories and concrete producers for the opportunity to audit their testing procedures by anonymously comparing results with their peers.  As an industry, it is important that we maintain the highest standards of testing and these events help bring awareness, education, and increased visibility to proper procedure while highlighting the variability of concrete
cylinder tests.

For 2024 we will host 6 Round Robins throughout the Carolinas. All companies are invited to participate at any location that is in their market or service area. Companies are encouraged to send individuals or 1-2 people who can work as partners.

Schedule & Day of Needs

All individuals testing will need to bring their own testing materials and arrive on site by 10:30am. Concrete will be batched at 10:45am and the event will end by 12 noon and will include lunch.

Each participant must:

  • Sample the concrete from the same batch and conduct the following tests: air content,
    slump, unit weight and temperature. all ASTM/ACI procedures and rules apply.
  • Provide their own testing equipment and cylinder molds
  • Make six 4” x 8” cylinders
  • Remit their test results on the data reporting form within 24 hours of 28-day breaks

Sign Up

As a reminder, there is no charge to participate, and the events are open to all laboratories and producers in the Carolinas. These events are great opportunities to connect with other industry professionals while supporting the industry! Sign Up via the link below for all locations you wish to participate at – confirmation emails will be sent to the main contact included with the form submission.


Results will be presented at the CRMCA Fall Workshop and on a Virtual Round Robin Results Webinar on November 20. All results will be submitted and represented via a randomly generated number to ensure confidentiality of all participants.

Sign Up Today!



April 9, 2024
Knight’s Redi-Mix
480 Hodge Road Building One Summerville, SC 29483

April 23, 2024
Carolina Sunrock LLC
5043 Unicon Dr, Wake Forest, NC 27587

May 8, 2024
S & W Ready Mix Concrete Company
5312 Holly Shelter Road, Castle Hayne NC 28429

May 21, 2024
Thomas Concrete Inc.
2442 Mt. Pisgah Cemetery Road, Conway SC 29526

May 30, 2024
Concrete Supply Co.
3823 Raleigh Street, Charlotte NC 28206

August 27, 2024
Thomas Concrete Inc.
719 Worley Road, Greenville SC 29609