Over the last few years, cities and suburbs has become larger and densely populated. Earlier road sides of these area were covered by mostly vegetation and natural surfaces. But now it is replacing by impermeable infrastructures day by day. The absence of this natural surfaces and man-made obstructions have let cities with the challenge of increasing runoff volume during rainy season resulting serious water logging. Due to this water logging, pavement is facing serious hydraulic pressure specially, during moving of wheel load. This sustained water on pavement has a hazardous impact on flexible pavement resulting the stripping of bitumen and destroys the bond between aggregate and bitumen. Bangladesh is situated in the zone of sub-tropical monsoon climate. The annual rainfall varies from 1429 to 4338 millimeters (BMD, 2014). To remove these huge volume of rainfall water, adequate drainage system along with drainage maintenance system is necessary. But improper drainage and maintenance system let cities with the challenge of water logging.
The main purpose of this study is an attempt to provide provision for increasing the volume of surface runoff using Permeable pavement. Permeable pavement is a solution which permits fluids to pass freely through it and control the amount of run-off from the surrounding surface areas. The overall benefits of permeable pavements may include improved storm water drainage, skid resistance, reduction of mud spray to drivers as well as a potential for noise reduction. In addition, the main aim of the study is to achieve a permeable pavement using proper gradation criteria and to compare its performance in terms of Marshall Stability and Water sensitivity. Another attempt has been tried to compare the permeability between dense graded bituminous pavement & permeable bituminous pavement using CRMB.
From the study, it has been found that the stability and the moisture susceptibility of Permeable Pavement has increased using CRMB rather than Neat Bitumen. So, CRMB should be used for increasing the stability of pavement as like as to reduce the moisture damage. The permeability of Permeable Pavement is much better than dense graded pavement both prepared using CRMB. For dense graded pavement, the co-efficient of permeability is approximately zero. Whereas for Permeable Pavement, it has increased to 0.42 cm/sec.
Contributors: Tohur, R., & Amin, J.