Feasibility Investigation of Superhydrophobic Engineered Asphalt Concrete for Roadway Winter Maintenance Ali Arabzadeh 1 , Therin Young 2 Halil Ceylan 1 , Sriram Sundrarajan 2 Sunghwan Kim 1 and Kasthurirangan Gopalakrishnan 1 1 Dept. of Civil, Construction and Environmental Engineering (CCEE) 2 Dept. of Mechanical Engineering (ME) Program for Sustainable Pavement Engineering and Research (PROSPER) Institute for Transportation (InTrans), Iowa State University (ISU) 2015 Mid-Continent Transportation Research Symposium Gateway Hotel and Conference Center, Ames, IA, August 19–20, 2015
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Feasibility Investigation of Superhydrophobic Engineered Asphalt
Concrete for Roadway Winter Maintenance
Ali Arabzadeh1, Therin Young2
Halil Ceylan1, Sriram Sundrarajan2
Sunghwan Kim1 and Kasthurirangan Gopalakrishnan1
1Dept. of Civil, Construction and Environmental Engineering (CCEE)2Dept. of Mechanical Engineering (ME)
Program for Sustainable Pavement Engineering and Research (PROSPER)Institute for Transportation (InTrans), Iowa State University (ISU)
2015 Mid-Continent Transportation Research Symposium Gateway Hotel and Conference Center, Ames, IA, August 19–20, 2015
ACKNOWLEDGEMENTS
• Iowa State University • FAA and PEGASAS
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OUTLINE
• Background• Methodology• Results• Conclusions
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BACKGROUND
• Each year billions of dollars are spent for: Snow and ice removals Weather damage to roadways Revenue lost to closed businesses
• 76,300 flight cancellations in 2014 Leaving millions of travelers in lurch Costing airlines and airports millions
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• Problems Associated with Ice Formation and Snow Accumulation on Roadways and Runways
BACKGROUND
5
www.beaumontenterprise.com
www.vosizneias.com Courtesy: CNN
www.warbird-central.com
• Ice and Snow Removal on other Outdoor Structures
Note: 1Ave stands for the average and 2SE stands for the standard error
2-way ANOVASources PPTFE (%) 0.016
Spray time 0.0002˂ 0.05˂ 0.05
Confidence interval of 95%
RESULTS
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• Measurement of Coefficient of Friction
y = 0.2532x - 4.0642R² = 0.9955
0
1
2
3
4
5
6
7
8
9
15 20 25 30 35 40 45 50
Fric
tion
forc
e (m
N)
Normal force (mN)
0.19 0.
20
0.16
0.16
0.19
0.26
0.19
0.23
0.15
0.23
0.23
0.27
0.17
0.26
0.24
0.24
0.21
0.21
0.21
0.21
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
3 6 9 12
Coe
ffici
ent o
f fric
tion
Spray time (seconds)
10% 20% 30% 40% Control
2-way ANOVASources PPTFE (%) 0.001
Spray time 0.0001
Confidence interval of 95%
˂ 0.05˂ 0.05
µ𝑘𝑘= 0.25
OUTLINE
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• Background• Methodology• Results• Conclusions
CONCLUSIONS
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• LBL method for PTFE deposition seems to be a promising method
• Micro-tribometer is an appropriate device for measuring the coefficient of friction
• Spray time significantly affects the superhydrophobicity and skid resistance of the coated asphalt concrete samples
CONCLUSIONS
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• In the context of micro-texture, PTFE results in obtaining comparable or higher skid resistance in the nano-coated asphalt concrete at a certain spray time
• In the context of macro-texture, shape, distribution and angularity of the coarse aggregate are the main contributors to improving the skid resistance