| January 17, 2012 | ||
| 11:30 am | to | 1:00 pm |
ACI San DiegoChapter –January 17, 2012 Program
“CONCRETE WITH REDUCED SHRINKAGE, CRACKING, AND CURLING.”
Presented by: Dave Flax- The Euclid Chemical Company
Presentation Outline:
This presentation will cover a great many topics that affect the shrinkage, cracking, and curling of concrete. Typical concrete shrinks about 0.06%. In this presentation the emphasis for the concrete mix design will be on reducing the shrinkage to 0.04%, 0.02% or even 0.00% by the use of the proper coarse aggregate size & quantity and by the use of shrinkage reducing & shrinkage compensating admixtures. We will cover how to write a spec to achieve these low shrinkage percentages.
But if we don’t want cracks and curling, getting the mix design right is only the beginning. We will also look at what happens after the concrete is placed including the use of an evaporation retarder, proper curing, joint layout, sawcutting, etc.
There are many tests that are typically run on the concrete at the jobsite and in the weeks following, but none of them tell us right there at the job site in real time if concrete is likely to shrink, crack, and curl. We will cover the one job site test method that will provide that critical information immediately.
Biographical sketch:
The presenter: Dave Flax of The Euclid Chemical Company has a Civil Engineering Degree from RPIand over 35 years experience as a field engineer, a contractor, and a researcher with the Corps of Engineers. He has earned his CDTand CCPR from CSI. He has specialized in concrete and has had dozens of articles published. He was awarded the Extra Yard Award by the SCCP for his 30+ years of service to the concrete industry. He is on a number of national organization committees including the “Methods and Materials”, “Guide Specifications”, and “Repair of Construction Defects” committees. He has spoken on this topic and others at The World of Concrete and numerous organizations.