May 20th, 2021 Zoom meeting

May 20, 2021
12:00 PM - 1:00 PM

Zoom Meeting

We hope you'll join us for a Zoom lunch meeting on Thursday, May 20, 2021.
Time: 12pm - 1pm

Attendee Registration Link:

Attendees interested in receiving a certificate of attendance will need to provide their name, and email address during registration. Certificates will be emailed to attendees about 1 week after the presentation.

Topic: Low Compressive Strength Test Results
Compressive strength tests are used for concrete acceptance based on criteria defined in ACI 318 and ACI 301. Tests results not meeting these criteria are referred to as low strengths. This presentation covers the “low strengths” topic in detail and provides answers to questions such as: what is considered a strength test and what is not, what the minimum frequency of testing is, what the acceptance criteria for strength tests are, and how to investigate strength tests not meeting the acceptance requirements. In addition, steps needed by a concrete supplier, in case acceptance criteria are not met, will also be discussed. To better understand discussed concepts, the presentation will use statistical concepts and numerical examples. A list of reading resources will be provided for those interested to study it in more detail.

Topics covered in this presentation include:
• Definitions related to strength testing
• Methods of sampling, fabrication, handling and curing strength test specimens
• Acceptance criteria for strength tests
• Interpretation of strength test results not meeting acceptance requirements
• Investigation of non-compliant concrete
• Addressing low strength concrete issues in production

Speaker: Sureka Sumanasooriya, PhD

Sureka Sumanasooriya, PhD, is an Engineer at the American Concrete Institute. Her role at ACI is to provide technical and administrative support to ACI's Technical Committees. She received her BSc in Civil Engineering from University of Peradeniya, Sri Lanka, and her PhD in Civil and Environmental Engineering from Clarkson University, NY. She worked as an Instructor in the Civil and Environmental Engineering Department at Clarkson University before joining the ACI Engineering Department in 2018.

This presentation is part of ACI’s Chapter Talks program. We will have a raffle for ACI-IL members. The winner will be able to choose between an ACI individual membership ($259 value), ACI collection of concrete codes, specifications, and practices ($859 value), ACI university all-access digital subscription ($299 value), or ACI concrete repair digital subscription ($249 value).