November Meeting Recap
We had a ruckus crowd for our November meeting. One of our own, long time members Jeff Speck, PE, F. ACI; VP of Marketing for Big River Industries, give us a review of an Expanded Shale, Clay and Slate Institute (ESCSI) presentation on Improving the Performance of Concrete with Internal Curing. Jeff opened with some basics on concrete curing and discussed the difference between internal and external curing methods. He went into some detail on some of the challenges with external curing, like the reduced permeability of high performance concrete limiting water migration through the concrete and the need for longer duration curing times with increased SCM use.
Internal curing has demonstrated the ability to overcome some of the external curing challenges by providing internal water reservoirs in fresh concrete that can be used to replace water lost due to drying. The internal water reservoirs are in the form of a small amount of porous prewetted lightweight aggregate pieces mixed in the fresh concrete.
Jeff then launched into a detail discussion on why internal curing works and what benefits it has for the durable properties of concrete; more efficient and complete cement hydration, less shrinkage and/or cracking, reduced warping in slabs, and higher strengths. Specific project applications in Denver, New York, Texas, Indiana, and Illinois were summarized and discussed. Jeff closed with a review of the general body of knowledge that currently exists on the topic including the new ACI Document from ACI Technical Committees 308 & 213, ACI (308-2134)R-13 Report on Internally Cured Concrete Using Prewetted Absorptive Lightweight Aggregate.
Chapter Vice-President, Angela San Martin, closed with the Georgia Chapter Cup presentation and thanked everyone for their attendance and support, reminding everyone of our upcoming Christmas Meeting on December 19th.