METHODS

1: Four locations on an existing pervious concrete sidewalk at Sloan Hall (A, B, C,D) were chosen for surface infiltration

testing under various ambient weather temperature conditions using ASTM C1701 with one gallon of water for each test

(prewetting, alpha (α), and beta (β)). Testing stopped for a while at locations A and B due to clogging from the neighboring

landscape bed restricting flow. Later these two areas were readily cleaned with power washing, and testing resumed.

2: Buckets of water were left out prior to testing to have the water reach ambient temperature. Water, air, and surface

temperatures were noted in addition to the infiltration times.

3: The surface infiltration rates were compared to earlier rates (2014) and to temperature variations.

Temperature related climatic impacts on the surface infiltration rates of pervious concrete

1: Large pervious concrete placement installed in the summer of 2012 (Sloan)

Acknowledgements: The authors are grateful for

funding provided by the US Department of

Transportation through the Center for

Environmentally Sustainable Transportation in Cold

Climates (CESTiCC), and the Washington State

Department of Ecology Husseman Fund. Thanks

also go out to the many students that helped in the

testing. The authors’ are appreciative of the

investment from Facility Services at WSU for placing

and maintaining these installations.

Reference: Werner, B. and Haselbach, L. (2016)

Temperature and testing impacts on surface

infiltration rates of pervious concrete, Under Review

Summary of A, B, C and D for 2015-2016 tests

TABLE 2 Comparison of Slab to New Core Surface Infiltration Rates: UFRGS

2: Surface Infiltration Rates versus Temperature and Time and Recorded Results

SUMMARY: It was found that there is no statistical correlation between

infiltration rates and temperature. Although it was observed in some cases there

were lower infiltration rates during periods of lower temperatures, the overall

impact of clogging from sources of runon, atmospheric deposition and other

inputs far outweigh reduced infiltration rates during lower temperatures.

However it is recommended that if infiltration testing is performed during times

of higher temperatures, that these rates be used conservatively as rates can

decrease during winter months.

During the course of testing it was observed that for the majority of the testing

infiltration rates became slower while running the beta (β) test. This is likely due

to fines and other debris being dislodged and carried into the substructure of the

pervious concrete surface. Because of this it is the authors’ recommendation that

a second infiltration test be performed after a prewetting test and initial

infiltration test to determine the true infiltration characteristics of a pervious

concrete placement.

Average β Average β Average β Average β

15-Apr-14 N/A 7.8 N/A 30.2 N/A 503.4 N/A 1126.5 N/A 1802.6 N/A

7-Jan-15 10:30 AM 7.5 2.2 40.6 35.4 67.0 53.5 461.3 287.3 516.7 453.3

15-Jan-15 10:30 AM 1.5 0.6 44.9 54.0 44.3 38.8 344.1 322.0 468.1 491.5

29-Jan-15 10:30 AM 5.5 3.3 20.6 20.4 96.1 88.5 436.5 406.0 583.6 583.6

5-Feb-15 10:30 AM 11.3 7.4 20.3 N/A 45.3 40.1 318.8 291.8 568.0 533.6

12-Feb-15 10:30 AM 15.0 8.8 N/A N/A 36.2 20.7 434.6 424.5 468.1 491.5

19-Feb-15 10:30 AM 14.6 5.4 N/A N/A 70.2 69.2 444.7 444.7 593.1 602.5

26-Feb-15 10:30 AM 3.7 4.9 N/A N/A 21.1 15.6 246.5 270.7 363.0 373.5

5-Mar-15 10:50 AM 19.0 3.1 N/A N/A 52.2 44.5 219.7 219.7 359.2 359.2

12-Mar-15 11:15 AM 15.2 10.6 N/A N/A 42.0 35.4 271.2 259.4 492.9 466.9

16-Apr-15 10:30 AM 19.5 9.2 N/A N/A N/A N/A 252.0 212.2 335.2 311.3

8-May-15 10:30 AM 20.9 21.7 N/A N/A N/A N/A 187.9 181.3 305.3 283.0

22-May-15 10:30 AM 25.3 17.7 N/A N/A N/A N/A 178.5 158.3 275.0 233.5

11-Jun-15 12:15 PM 27.9 27.8 N/A N/A N/A N/A 210.2 177.9 278.5 255.8

2-Oct-15 2:00 PM 17.2 19.6 348.9 316.6 305.1 270.7 140.7 127.1 154.6 139.4

4-Jan-16 1:00 PM 2.7 4.2 428.8 366.2 181.6 174.5 148.5 113.9 147.4 140.4

12-Jan-16 2:30 PM 6.0 3.9 377.3 373.5 172.3 166.8 143.2 140.4 110.2 93.4

28-Jan-16 3:00 PM 6.4 4.9 381.2 381.2 182.9 171.3 153.7 151.8 166.0 141.5

ADate Time

Air

Temperature

(⁰C)

Water

Temperature

(⁰C)

Locations Cleaned Locations Not Cleaned

Infiltration Rates at Each Location (cm/hr)

B C D

Brandon Werner, Liv Haselbach

3: Correlation Plots For Temperature and Testing versus Infiltration Rates

Correlation plot of infiltration rates versus water

temperature

Correlation plot of infiltration rates between α and β

tests

Slope is 1.05 and R2 is 0.97

ABSTRACT: Pervious concrete helps infiltrate our stormwater and ice melt, is this infiltration rate significantly impacted with higher viscosities of water during colder events?

PERVIOUS CONCRETE AT WSU - PULLMAN

Sloan Hall SidewalkValley Playfields Center Veterinary Medicine Circle Valley Playfields East PACCAR Building Community Hall Sidewalk