Hydraulic and drainage properties play an important role in the serviceability of a permeable block pavement system. A serious impediment to its performance is the accumulation of sediments over time. The deposition of these particles in block pavement joints reduces infiltration rate and drainage capacity, which, in the long run, decreases the system’s life span. In this study, laboratory experiments were conducted in order to investigate the influence of particle deposition on the hydraulic conductivity of a type of block pavement system, permeable stone paver, without maintenance or cleaning. Coefficients of permeability before and after addition of fine particles were evaluated using a developed permeability equipment with constant head frame. Three gradations of silica sand were used to simulate road clogging particles. An equivalent of eight years of sediment loading was applied to three identical permeable pavement samples. Laboratory test results showed an average of 77% reduction on the permeability due to particle accumulation.

With interconnecting voids, porous asphalt provides drainage of rainwater in vertical and lateral direction during rainfall. In addtition, it also offers remarkable advantages compare to traditional asphalt: reduce vehicle splash and spray behind, reduce night time surface glare in wet season and increase tire-pavement friction...On the other hand, the following aspects are recognized as disavantages: reduced performance, winter maintenance issues and high construction cost. For flexible pavement, dynamic modulus master curve is an important parameter in the mechanistic-empirical pavement design guide. In this study, the results of experiment of dynamic modulus test of porous asphalt are discussed for understanding well about the viscoelastic characteristics of porous asphalt.