THESIS. EFFECTIVENESS OF BACK- FLUSHING FOR CLEANING POROUS PAVEMENTS. By- Nilesh Shirke. Fall 2006. Outline. Introduction Problem Statement Research Question Methodology Construction of a Model Detailed Procedure of Experiments Experiments and Results
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EFFECTIVENESS OF BACK- FLUSHING FOR CLEANING POROUS PAVEMENTS
By- Nilesh Shirke
Bean, Hunt, Bidelspach, & Smith, 2004; Leopold, Wolman, & Miller, 1964
James, W., & Langsdorff, H., 2003; Bachtle, 1974; Caltrans, 2004; Georgia concrete and products association, 2005, p. 2; Surface System Drainage Design, 2005
Georgia Stormwater Management Manual, 2002
The Urban Land Institute, 1992, p 6.
Adams, 2003; Bachtle, 1974; Field, 1982; Ferguson 1994; Magnus, 2000; Pratt 1997; The Pervious Company, 2005; Georgia Concrete and Products Association, 2005; Miller, 2005
Field, 1982; UNI-Group U.S.A., 1998; United States Environmental Protection Agency, 1999.
James & Langsdorff, 2003; The Urban Land Institute, 1981; United States Environmental Protection Agency, 1999; Siew-Ann et al., 2003; Georgia Stormwater Management Manual, 2002
Georgia Stormwater Management Manual, 2002, p 37
When water is flushed through the pavement from bottom to the top with enough pressure, it removes the debris particles trapped in the pores of porous concrete layer.
- Cement-600 lbs, Aggregates 3/8”-2900 lbs, Water-242 lbs
A three feet long and 8” diameter pipe for construction of filter layers, stone layer of the pavement in it.
Calculation of permeability:
k = QL / Ath
k (back-flush)- k (clogged) / k (Initial) – k (clogged)
High Porous Concrete - 895.59 psi
Low Porous Concrete - 1164 psi
Cu = D60/D10 &
Cc = (D30*D30) / (D60*D10)
D30 = 0.8
Alpha = 0.05
Error Degrees of Freedom 64
Error Mean Square 198.7347
Number of Means 2 3 4
Critical Range 8.1301265 9.7646019 10.734814
***Means with the same letter are not significantly different.
SNK Grouping Mean N Pressure