TRB WEBINAR PROGRAM Internal Curing of Concrete Pavements Thursday, February 16, 2017 2:00-3:30 PM ET
The Transportation Research Board has met the standards and requirements of the Registered Continuing Education Providers Program. Credit earned on completion of this program will be reported to RCEP. A certificate of completion will be issued to participants that have registered and attended the entire session. As such, it does not include content that may be deemed or construed to be an approval or endorsement by RCEP .
Purpose Discuss the internal curing of pavements, the process by which the curing water comes from the aggregates within the concrete. The presenters will discuss the concepts of internal curing, practical applications, mixture design, construction, and quality control. Learning Objectives At the end of this webinar, you will be able to: • Understand the fundamentals of internally cured concrete pavements and their applications. • Understand the materials used for internally cured pavement applications including mixture design and properties of IC concrete. • Understand the process of construction of internally cured concrete pavements.
PDH Certificate Information • This webinar is valued at 1.5 Professional Development Hours (PDH) • Instructions on retrieving your certificate will be found in your webinar reminder and follow-up emails • You must register and attend as an individual to receive a PDH certificate • TRB will report your hours within one week Questions? Contact Reggie Gillum at RGillum@nas.edu •
All Attendees Are Muted
Questions and Answers • Please type your questions into your webinar control panel • We will read your questions out loud, and answer as many as time allows
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Panelists Presentations http://onlinepubs.trb.org/onlinepubs/webinars/170216.pdf After the webinar, you will receive a follow-up email containing a link to the recording
Today’s Participants • Sam Tyson, Federal Highway Administration, sam.tyson@dot.gov • Jason Weiss, Oregon State University, jason.weiss@oregonstate.edu • Dennis Morian, Quality Engineering Solutions, dmorian@qespavements.com • Steven Gillen, Illinois Tollway, sgillen@getipass.com
Get Involved with TRB • Getting involved is free! • Join a Standing Committee (http://bit.ly/2jYRrF6 ) – AFD50 (Design and Rehabilitation of Concrete Pavements), AFH50 (Concrete Pavement Construction and Rehabilitation), and AFD70 (Pavement Rehabilitation) • Become a Friend of a Committee (http://bit.ly/TRBcommittees) – Best way to become a member – Ultimate networking opportunity • For more information: www.mytrb.com – Create your account – Update your profile 97 th TRB Annual Meeting: January 7-11, 2018
Internal Curing for Concrete Pavements Transportation Research Board Webinar 2:00 PM – 3:30 PM Thursday, February 16, 2017 Sam Tyson, P.E. Concrete Pavement Engineer FHWA Office of Asset Management, Pavements, and Construction
Internal Curing for Concrete Pavements TRB Committee/Webinar Sponsors – • AFD50 – Design and Rehabilitation of Concrete Pavements • AFH50 – Concrete Pavement Construction and Rehabilitation
Internal Curing for Concrete Pavements Background : FHWA Publication – Internal Curing for Concrete Pavements FHWA-HIF-16-006, July 2016 https://www.fhwa.dot.gov/pavement/concrete/pubs/hif16006.pdf and numerous references cited in that document.
Internal Curing for Concrete Pavements Jason Weiss, Oregon State University Dennis Morian, Quality Engineering Solutions Steven Gillen, Illinois Tollway
Internal Curing for Concrete Pavements • Introduction and Background • Mixture Design • Quality Control • Emerging Potential Benefits • Pavement Applications
Samuel S. Tyson, P.E. Concrete Pavement Engineer Office of Asset Management, Pavements, and Construction Federal Highway Administration 1200 New Jersey Avenue, S.E. – E73-440 Washington, DC 20590 E-mail: sam.tyson@dot.gov Phone: 202-366-1326
INNOVATIVE SOLUTIONS TO COMPLEX PROBLEMS Internal Curing for Concrete Pavements Jason Weiss, Dennis Morian, Shree Rao 1 1 Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 1 of 36
Associated Technical Brief • This presentation was developed to accompany FHWA Tech Brief HIF-16-006 • It will discuss concepts of IC for concrete pavements including: mixture design, construction, and quality control Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 2 of 36
Outline for Today’s Talk • We want to discuss what internal curing is and where Internal Curing may have applications • Mixture Design • Quality Control • Emerging Potential Benefits – Reduce Joint Damage – Reduce ASR Damage (dilution/accomodation) – Reduced Built in Stress and Curing Times • Pavement Applications ASR = Alkali Silica Reaction Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 3 of 36
What is Internal Curing? • Internal curing water is simply water curing where the water is provided from inside the concrete • In the US this is typically done currently by placing water inside the porous LWA • This can also be done using superabsorbent polymers (SAP), absorptive fibers, or recycled concrete • However currently these technologies are not as readily available for use in pavements as is fine LWA LWA = Lightweight Aggregate SAP = Superabsorbent Polymer Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 4 of 36
External and Internal Curing Castro et al. 2009 Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 5 of 36
Where Has Internal Curing Been Used Bridge Decks - DiBella et al. 2011 Water Tanks - Bates et al. 2012 Patches - Barrett et al. 2014 Pavements - Friggle et al. 2011 Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 6 of 36
Outline for Today’s Talk • We want to discuss where Internal Curing may have applications • Mixture Design • Quality Control • Emerging Potential Benefits – Potential to Reduce Joint Damage – Potential to Reduce ASR Damage (dilution/accom.) – Reduced Built in Stress and Curing Times • Pavement Applications Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 7 of 36
How Is IC Concrete Made • Except for LWA, IC concrete mixture design generally is identical to that of conventional concrete with similar air content, water content, and coarse aggregate content. • Currently, IC in North America is typically achieved by replacing a portion of the conventional fine aggregate (i.e., sand) with a pre- wetted lightweight fine aggregate. IC = Internal Curing Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 8 of 36
Outline for Today’s Talk • We want to discuss where Internal Curing may have applications for • Mixture Design • Quality Control • Emerging Potential Benefits – Reduce Joint Damage – Reduce ASR Damage (dilution/accomodation) – Reduced Built in Stress and Curing Times • Pavement Applications Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 9 of 36
Mixture Design for Internal Curing • similarities and differences between the design of a conventional 6-bag mixture (water-to-cement ratio of 0.36 and 6 percent air) and an IC mixture • assumes 15% absorption of the FLWA • 7 lb of IC water for every 100 lb of cementititious materials. Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 10 of 36
Simple Mixture Proportioning • Convert an existing paving mixture or a bridge deck mixture to an IC Mixture IC Mixture Design Materials Weight SG (SSD) Volume, ft3 Cement 564 3.15 2.869 GGBFS 115 2.99 0.616 Fly Ash 0 2.64 0.000 Silica Fume 25 2.2 0.182 Sand 591 2.623 3.613 Lightweight Aggregate 413 1.750 3.780 Coarse Aggregate 1 1700 2.763 9.860 Internal Curing Properties Coarse Aggregate 2 0 2.763 0.000 LWA Absorption: 15.0% Water 258 1 4.135 LWA Desorption: 85.0% Air 0 0 1.755 Σ LWA Specific Gravity 1.750 3666 - 26.810 Cement Factor 704 Chemical Shrinkage: 0.065 Degree of Hydration 1 SSD LWA Replacement 413 SSD Sand Replaced 619 Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 11 of 36
Outline for Today’s Talk • We want to discuss where Internal Curing may have applications for • Mixture Design • Quality Control • Emerging Benefits – Potential to Reduce Joint Damage – Potential to Reduce ASR Damage (dilution/accom.) – Reduced Built in Stress and Curing Times • Pavement Applications Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 12 of 36
Measuring Aggregate Properties • Aggregate Moisture • Surface Moisture • Aggregate Absorp. • Specific Gravity (Relative Density) • Desorption • Spreadsheet and Step by Step Process (Miller et al 2014) Internal Curing for Pavements Prepared by Jason Weiss, Dennis Morian and Shree Rao Slide 13 of 36
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