LinkedIn Post and Discussion, March, 2022:
Jeb Tingle, Senior Scientific Technical Manager (SSTM)-U.S. Army Engineer Research and Development Center #adr #erdc
SUMMARY
PROCESS: Repairs were conducted by Army troops under contingency operating conditions at temperatures averaging 25º Fahrenheit (F) with NO ACCELERATING ADDITIVES. Under these conditions, the mixes were placed rather wet. We DID observe some MINOR shrinkage cracking on the surface. For this application, minor shrinkage cracking is acceptable. Again, the aspect of this concrete experiment is that a patch mix, while hydrating, generates a lot of heat. There were NO ACCELERATING ADDITIVES—the pavement did not exist. The pavement mixes were placed rather wet, then selectively heated up!Comments and replies to questions below:
Jeb Tingle
Neche I., Pavements, Materials, Transportation & Contracts Engineer:
Q: Were there cracks on the patched new surfaces?
JEB: A: We observed some minor shrinkage cracking on the surface, but for this application, minor shrinkage cracking is acceptable.
Neche:
A: Pavements, Materials, Transportation & Contracts Engineer
Thanks for providing these details!
Robert C., Senior Technical Product Specialist-Master Builders Solutions
Q: At what temperatures were the materials conditioned?
JEB: A: Repairs were conducted by Army troops under contingency operating conditions at temperatures averaging 25º Fahrenheit (F) with no accelerating additives. Under these conditions, the mixes were placed rather wet.
Alireza N., CE Technician
You can read endless documents about concrete curing and its exothermic effect, but it is fascinating seeing it in action.
John K., PE, PMP, LEED AP-BDC, Engineering Flight Commander
I’m a believer!
Ajay S., Director, Paving
Interesting! Looks like the product is based on CAC technology, similar to products for cold storage floors.
Blake B., CE Technician, Supervisor, Certified Instructor, Resiliency Trainer, Head of Training For Facility Manager, Site Senior
Interesting! Looks like the product is based on CAC technology, similar to products for cold storage floors. Was this done using the RADR process? This is very cool. I enjoyed teaching that at tyndall silverflag. Can say we never had snowing conditions.
Drilon D., QA/QC Leader / Civil Engineer
Photo of the day. 👍
Haroon R., President, Materials Engineering and Founder of a System for Real-time Monitoring of Concrete
Q: Noticed surface cracks probably due to premature exposure to cold weather?
JEB: A: Measured temperatures for the materials were 30º-35ºF, while the mix water ranged from 70º-85ºF, or close to that. Under these conditions, the mixes were placed rather wet, and during the process, we observed some minor shrinkage cracking on the surface. But, for this application, minor shrinkage cracking is acceptable.
Jon B., PhD, PE, Chief Technical Officer
Awesome!!!!
GEORGE C., World expert on pavement smoothness and intelligent construction:
Excellent “visual”, Jeb Tingle! The Transtec Group, Inc modeled the concrete heat of hydration and the risk for potential cracks in the Federal Highway Administration HIPERPAV software in the mid ’90s.
Downloads:
HYPERPAVE Software: Click on image above, or: www.linkedin.com/in/ACoAABQAdBEBfen_VdQZRPIY6wH1i6r2HYhivPo
The Latest HIPERPAV: Click on image below, or: : www.thetranstecgroup.com/hiperpav/download-hiperpav/ and the User’s manual: www.fhwa.dot.gov/publications/research/infrastructure/pavements/09048/manual.cfm
#Concrete #modeling #heat of hydration #stress and strain #cracking
L: HIPERPAV: www.thetranstecgroup.com/hiperpav/download-hiperpav/
R: USER’S MANUAL: www.fhwa.dot.gov/publications/research/infrastructure/pavements/09048/manual.cfm
For this LINKEDIN POST, please click on Jeb Tingle’s photo above, or go to: linkedin.com/feed/hashtag/?keywords=erdc&highlightedUpdateUrns=urn%3Ali%3Aactivity%3A6907364849970778112
#Concrete #modeling #heat of hydration #stress and strain #cracking