Design methodology and clogging investigation of 2-layered pervious concrete (2L-PC) for pavement applications

ABSTRACT

Conventional Pervious Concrete (CPC) addresses flash flooding and urban heat island effect. However, the major problems observed in CPC pavements include ‘clogging’ and ‘ravelling’ reduces its functionality. This study proposes a new method of preparing pervious concrete (PC) to limit clogging and ravelling, which is referred to as two-layered pervious concrete (2L-PC). Several combinations of top and bottom layers with different aggregate sizes were studied initially using AutoCAD to identify the combination, resulting in a minimum of 20% interface porosity. The selected combinations were investigated for basic properties, flow, and clogging behaviour. A well-defined relationship between density and porosity was found, which was in the domain of CPC. The average permeability, clogging, and rejuvenation potential varied in the range 0.16–0.75 cm/s, 63.74–93.88% and 57.82–80.13%, respectively. It was observed that, 2L-PC with 4.75 mm (Top) – 9.5 mm (Bottom) had higher permeability, lower clogging potential, and higher rejuvenation potential. It was found that on an average, 53–59% of clogging materials were restrained from entering into the pore structure and at least 60% of their original permeability was recovered by all the samples post-rejuvenation, which make the material clogging resistant and well suitable for porous pavement applications.

KEYWORDS:

• 2-layered pervious concrete (2L-PC)
• permeability
• clogging potential
• rejuvenation potential

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors acknowledge the funding support from IIT Bhubaneswar vide project No. SP 100.