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Project Alluvion – City of West Des Moines
Project Alluvion
American Concrete Pavement Association
November 30, 2016
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Project Alluvion – City of West Des Moines
Introductions
Andy Denker – CTI Jeremy Huntsman – HR Green
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Project Alluvion – City of West Des Moines
Project Alluvion
City of West Des Moines CTI Elder Corp J&K Construction Bolton & Menk McClure Engineering MSA Shive-Hattery HR Green Civil Design Advantage
Iowa State University Purdue University Oregon State University Louisiana Transportation Research Center CP Tech Center Iowa Concrete Paving Association Minnesota Dept. of Transportation Iowa Dept. of Transportation Logan Contracting
Project Participants / Consultants / Contractors
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Project Alluvion – City of West Des Moines
Project Alluvion
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Project Alluvion – City of West Des Moines
Data Center and Concrete? Test Section New/Existing Pavement Traffic Volumes Dataset
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Project Alluvion – City of West Des Moines
And Your Point Is?Current Concrete Issues Chemical Attack Freeze/Thaw Saturation
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Project Alluvion – City of West Des Moines
Concrete Mix Calcium Oxychloride Increase Fly Ash to 33% Reduce Reaction of Salts with Calcium Hydroxide
Air – Minimum of 6% Behind Paver W/C ratio – 0.40 Target, 0.42 Maximum 400 lbs Cement Minimum During Cold Weather
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Project Alluvion – City of West Des Moines
Testing and Results
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Project Alluvion – City of West Des Moines
Resistance to Chemical De-IcersSoak tests 56 day cure Soak in 4%
MgCl2 at 40ºF
High FA (MQMC) DOT (QMC)
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Project Alluvion – City of West Des Moines
Air and DurabilitySuper Air MeterRapid Air Test
Image: Gudimettla
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Project Alluvion – City of West Des Moines
Air and DurabilityResults
• Air content—good• 5.6-8.2% in front of paver (conventional—higher)• All cores: 5.8% and up
• SAM/spacing factor
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Project Alluvion – City of West Des Moines
Air and Durability
• Freeze/thaw resistance (ASTM C666)• Durability factor – all above 75% indicating a good
F/T resistance• Correlate with air structure
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Project Alluvion – City of West Des Moines
Permeability
Resistivity TestResults
• 7 & 28 days• Similar results for M-QMC and reg. QMC
• 56 & 91 days• M-QMC showing continuous improvement, higher
resistivity than reg. QMC• Significant improvement over C4
Image: Proceq
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Project Alluvion – City of West Des Moines
Permeability
Resistivity of Core Samples:Higher resistivity =less permeable,greater durability
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Project Alluvion – City of West Des Moines
WorkabilityBox Test
• Results: excellent
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Project Alluvion – City of West Des Moines
Workability
Vibrating Kelly Bell• All results in good range for slipform
paving (VKelly index: 0.69-1.10 in/√s; recommended: 0.6-1.1 in/√s)
• Higher index: possible correlation with curb collapse
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Project Alluvion – City of West Des Moines
Project Alluvion
Construction Collaboration Issues before paving Aggregates Pricing Previous experience Test section Fly ash Availability
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Project Alluvion – City of West Des Moines
Project Alluvion
Construction Adjustments made first day Actual workability Air loss Water W/C discussion Power settings Temperamental mix
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Project Alluvion – City of West Des Moines
QUESTIONS FROM THE AUDIENCEAsk away…
