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
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