internal curing: benefits, current state, & directions2018/07/11 · internal curing: benefits,...
TRANSCRIPT
NCC Meeting April 21st , 2015 Slide 1 of 52
Approach
Corrosion
App. Diffusion
Resistivity
Formation Factor
Pore Solution
Curing/Leaching
Temperature
Freeze-Thaw
Deg of Saturation
Sorption
Salt Reaction
Purdue UniversitySchool of Civil Engineering
Internal Curing: Benefits, Current State, & Directions
Prepared by
Jason Weiss, [email protected]
Prepared for
NCC 2015
NCC Meeting April 21st , 2015 Slide 2 of 52
Approach
Corrosion
App. Diffusion
Resistivity
Formation Factor
Pore Solution
Curing/Leaching
Temperature
Freeze-Thaw
Deg of Saturation
Sorption
Salt Reaction
Internal Curing – The Bullet
• Lots of research oninternal curing:– Reduce the potential
for cracking– Reduce chloride
ingress and delay corrosion
– Improve construction robustness (plastic cracking, thermal cracking etc)
– Simple technology (replace some of fine aggregate with fine lightweight aggregate)
NCC Meeting April 21st , 2015 Slide 3 of 52
Approach
Corrosion
App. Diffusion
Resistivity
Formation Factor
Pore Solution
Curing/Leaching
Temperature
Freeze-Thaw
Deg of Saturation
Sorption
Salt Reaction
Internal and External Curing
NCC Meeting April 21st , 2015 Slide 4 of 52
Approach
Corrosion
App. Diffusion
Resistivity
Formation Factor
Pore Solution
Curing/Leaching
Temperature
Freeze-Thaw
Deg of Saturation
Sorption
Salt Reaction
Comments on What I Heard this AM
• FLWA better than CLWA (InDOT; CoDOT)• Technically spacing without too much extra
water is the reason for this • Expanded clay, shale, slate, slag all have
shown potential to use (ASTM 1761)• Value in decks, repairs … a lot of research
is already done and ready• INDOT, NYDOT – benefits of ICHPC• CRCP pavement research in progress and
we are focused on curl with what we think are some innovative measures
NCC Meeting April 21st , 2015 Slide 5 of 52
Approach
Corrosion
App. Diffusion
Resistivity
Formation Factor
Pore Solution
Curing/Leaching
Temperature
Freeze-Thaw
Deg of Saturation
Sorption
Salt Reaction
General IC observations
• Similar or higher strength (increased hyd)• Reduced Chloride Diffusion (Note the IC
will be higher Cs at surface lower D)• Lower modulus … this is good• Freeze thaw shows good performance• SUBSTANTIAL REDUCTIONS IN
CRACKING AND WARPING• New testing for aggregate moisture content
(Centrifuge) and desorption (simple test)• Reduced corrosion, reduced corrosion at
cracks (This is a game changer)
NCC Meeting April 21st , 2015 Slide 6 of 52
Approach
Corrosion
App. Diffusion
Resistivity
Formation Factor
Pore Solution
Curing/Leaching
Temperature
Freeze-Thaw
Deg of Saturation
Sorption
Salt Reaction
2010 – 2 bridges; 2013 – 4 ICHPC 2014 – 1/2; 2015 1 INDOT; 3 County
4
2
1
3
5
Special Thanks
Tommy Nantung
Tony Zander and the team
Ron Walker
Contractors
Ready Mix Producers
Ryan Hekensiefken, Javier CastroTim Barrett and Albert MillerCameron Wilson, Nate Todd
NCC Meeting April 21st , 2015 Slide 7 of 52
Approach
Corrosion
App. Diffusion
Resistivity
Formation Factor
Pore Solution
Curing/Leaching
Temperature
Freeze-Thaw
Deg of Saturation
Sorption
Salt Reaction
Service Life Improvement
Service Life 60+6 to 100+6 years
Class C 18+6 years
For Reference to Steve’s TalkRCPT 1500 C 56 DaySLM also performed
NCC Meeting April 21st , 2015 Slide 8 of 52
Approach
Corrosion
App. Diffusion
Resistivity
Formation Factor
Pore Solution
Curing/Leaching
Temperature
Freeze-Thaw
Deg of Saturation
Sorption
Salt Reaction
Current State From My Perspective
• Proven Technology – Reduces cracking and ICHPC is ‘golden’ … ready, set, implement
• Requires training of contractors, inspectors• Right now specification is the ‘Cadillac’
There are also ‘Chevettes’ as well (recipe)• Centrifuge test provides moisture/spreadsheets• Glad to help ‘implement’ and track• ESCSI training modules on line; papers • May benefit from the ‘summary book’ on how to • ICHPC … really beneficial 5% gets you 300%• SAP may be coming …. Will be interesting • Would like to develop a system to track