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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
EVALUATION OF CLEANING
METHODS FOR PERVIOUS
CONCRETE PAVEMENT
Mbaki Onyango, Ph.D.
University of Tennessee at Chattanooga
August 5, 2015
ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Charles Sanford, M.Sc. Chem. Eng.; Tricia A. Thomas Ph.D.; Frank Jones,
Ph.D. PE; and Brent Rollins.
Other Authors
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Outline
Introduction
Project description
Laboratory tests
Results and Analysis
Conclusions and Recommendations
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Introduction
Pervious pavements allow water to percolate through and charge the ground water table.
Void content 20-40%
UTC analyzed debris found in pervious pavements and cleaning methods.
Sweeping
Pressure washing
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Benefits of Pervious Pavements
Recharge the ground water table with water from precipitation.
On safety, pervious pavements reduce hydroplaning.
Increased surface friction/skid resistance.
Pavement noise reduction.
Excellent insulator when used in walls.
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Project Description - Finley Stadium
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Laboratory Testing
Cores: 4in. wetted core drill bit, air dried and stored in the refrigerator.
Modified falling head infiltration rate test on:
Original, swept cores and pressure washed cores
Standard sieve analysis (ASTM C136)
Atterberg limits (ASTM D4318)
Organics test (UW Lab, 2004)
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Results and Analysis
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Statistical comparison of the samples
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Original un-cleaned samples:
Post Sweep
Post Sweep: Post Pressure
Wash
Sample p-Value
Statistically
Different?
Sample p-Value
Statistically
Different?
A 7.7E-07 Yes
A 4.5E-05 Yes
B 3.2E-07 Yes
B 1.4E-06 Yes
C 1.4E-01 No
C 1.3E-05 Yes
E 3.3E-07 Yes
E 2.3E-08 Yes
F 4.9E-02 Yes
F 8.4E-07 Yes
ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Conclusions and recommendations
The debris that clogged the samples was mainly non-cohesive material passing No. 40 sieve.
Depth of clogged voids was found to be about 1 in.
Not all the clogged material was from the surroundings some was brought in by other means.
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Conclusions and recommendations
On average, sweeping increased infiltration rate by average of 144%.
About 1 g. (0.0022 lb.) of material was removed per sample ~ 0.3 lb/ft2 of debris.
Pressure washing, on average increased infiltration rate by average of 288%.
It removed about 8.6 g (0.019 lb.) of debris from the samples ~2.5 lb/ft2.
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
Conclusions and recommendations
Sand, salts and deicing materials were not used on this site.
Sweeping removed some debris from the sample, pressure washing removed significant amount of debris from the samples.
Organic materials were tested to be <5% and soil from the garden around 30%
Clogging debris should not be expected to decompose.
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ISSAEST, Fairbanks, AK, USA, August 2-5, 2015
References 3-Co. Web. 11 Apr. 2013.
<http://www.3-co.com/Pro/Contractors/Special_Concrete/pervious.htm>.
Chopra, Manoj, Sai Kakuturu, Craig Ballock, Joshua Spence, and Marty Wanielista. (2010) "Effect of Rejuvenation Methods on the Infiltration Rates of Pervious Concrete Pavements." Journal of Hydrologic Engineering 15.6: 426. Print.
Coughlin, J. P., Chelsea D. Campbell, and David C. Mays. (2012) Infiltration and Clogging by Sand and Clay in a Pervious Concrete Pavement System. Journal of Hydrologic Engineering 17: 28-73. Print.
Deo, Omkar, Milani Sumanasooriya, and Narayanan Neithalath. (2010) Permeability Reduction in Pervious Concretes Due to Clogging: Experiments and Modeling. Journal of Materials in Civil Engineering: 741-51. Print.
Finley Stadium. n.d. Web. 27 Feb. 2015.
<http://www.perviouspavement.org/downloads/FinleyStadium.pdf>
FPP Industries - Flexible Porous Pavements - Frequently Asked Questions." FPP Industries - Flexible Porous Pavements - Frequently Asked Questions. Web. 11 Apr. 2013. <http://www.porouspavements.com.au/faq.html>.
Haselbach, Liv M. (2009) The Potential for Clay Clogging of Pervious Concrete under Extreme Conditions. Journal of Hydrologic Engineering 67-69. Print.
Kayhanian, Masoud, Dane Anderson, John T. Harvey, David Jones, and Balasingam Muhunthan. (2012) Permeability Measurement and Scan Imaging to Assess Clogging of Pervious Concrete Pavements in Parking Lots. Journal of Environmental Management 95.1: 114-23. Print.
Mata, Luis A., and Michael L. Leming. (2012) Vertical Distribution of Sediments in Pervious Concrete Pavement Systems. ACI Materials Journal 109: 149-55. Print.
Sanford Charles, (2014) A Study on The Debris Found in a Pervious Concrete Sample Master’s Thesis submitted to the University of Tennessee at Chattanooga. May 2014.
USDA (United States Department of Agriculture), Soil Conservation Service. Soil Survey of Hamilton County, TN. USDA. N.p., n.d. Web. 11 Apr. 2013.
Sriravindrarajah, R., HM Do, LD Nguyen, and Y. Aoki. (2011) Effect of Clogging on the Water Permeability of Pervious Concrete. Incorporating Sustainable Practice in Mechanics of Structures and Materials: 873-76. Print.
Tennis, Paul D., Michael L. Leming, and David J. Akers. (2004) Pervious Concrete Pavement. Portland Cement Association. Print.
The Environmental Solution, "Chattanooga Chooses Pervious for Finley." Pervious Concrete: Web. 11 Apr. 2013. <http://www.secement.org/PDFs/aFinley%20Stadium%20-%20Case%20Study.pdf>.
UW Lab "Organic Matter." Sept. 2004. Web. 11 Apr. 2013.
<http://uwlab.soils.wisc.edu/files/procedures/organic_matter.pdf>.
Vancura, Mary E., Kevin MacDonald, and Lev Khazanovich. (2012) Location and Depth of Pervious Concrete Clogging Material before and after Void Maintenance with Common Municipal Utility Vehicles. Journal of Transportation Engineering 138: 332-38. Print.
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