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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…