Clogging effects of portland cement pervious concrete

Defining clogging potential for permeable concrete

“…Coarse sand particles did not significantly reduce permeability as these large particles did not enter surface pores (Coughlin et al, 2012;Deo et al, 2010). However, Schaefer et al (2011) and Tong (2011) found that sand caused significant reductions in permeability, while finegrained silty clay produced almost no effect as it washed through the sample with no concentration in the pore structure. Combinations of silty clay and sand caused the highest permeability reductions, with complete clogging after a small number of cycles.…”

“…Permeable concrete, also known as pervious concrete, is used to alleviate local flooding in urban areas as it allows water to flow through normally impermeable infrastructure. However, permeable concrete exhibits loss of performance over time due to clogging caused by a build-up of sediment particles on the surface or within the pore structure (Deo et al, 2010;Yong et al, 2013;Mata and Leming, 2012;Coughlin et al, 2012;Tong, 2011). Predicting the effect of clogging on the long-term performance of permeable concrete is challenging and there is currently no reliable means of characterising clogging potential to enable performance comparison between different pavement systems.…”

Introduction to ASCE Monograph-Permeable Pavements in Cold Climates

“…Fine aggregate generally remains near the surface of permeable pavements and can be easily removed through vacuuming (Mata 2012). Vacuuming of sand particles is most effective if performed when the pavement is dry (Tong 2011).…”

Laboratory Evaluations of Long-Term Hydraulic Performance and Maintenance Requirements for Pervious Concrete Mixes: A Case Study in Southern Brazil

“…It has been well established that pervious concrete systems are prone to clogging if not adequately protected from oncoming soils or debris especially fine soils such as silts or clays. There have been numerous studies on clogging of pervious concrete both in the laboratory and the field (Haselbach 2010, Tong 2011, Mata 2008, Delatte et al 2008, Haselbach and Werner 2015, Kevern 2011.…”

“…Flat aggregate has not been used very extensively for pervious concrete. In addition, much of the local soil is a clayey silt mix with sand and small gravel which would tend to be a prime soil for clogging (Haselbach 2010, Tong 2011, Mata 2008. In Porto Alegre the typical maintenance procedure for cleaning local streets is manual sweeping.…”