Laboratory Evaluation of Clogging Potential of Porous Asphalt Mixtures

Abstract

A laboratory test to assess the clogging potential of porous asphalt mixtures is useful as part of a rational design procedure of using these mixtures for construction of pavement surface friction courses. Two prerequisites for the laboratory assessment are ( a) the ability to measure an engineering parameter indicative of the mixture’s drainage capacity, and ( b) the availability of a repeatable procedure of introducing materials into the mixture to create clogging. A laboratory clogging test to cause deterioration in the drainage capacity of typical porous mixtures is described here. Monitoring of the changes in drainage capacity during the test is made possible by the use of recently developed equipment to measure permeability. The proposed clogging test procedure was applied to evaluate four porous asphalt mixtures. Test results suggest that the procedure was able to ( a) produce significant degrees of deterioration in the drainage capacities of the mixtures, and ( b) differentiate the different behaviors of the four mixes under the clogging treatment of the test.

Development of Test Equipment for Evaluating Hydraulic Conductivity of Permeable Block Pavements

“…As these pollutants are being trapped within the joints and layers of the permeable pavement, the drainage performance of the pavement is at risk of failure, until it finally reaches an unacceptable level [6,9,12]. To better understand the clogging and filtration processes within permeable pavements, many studies have been conducted to assess the long-term hydraulic capacity through field and laboratory experiments [6,[13][14][15][16][17][18][19].…”

“…Using the equipment shown in Figure 3, Fwa et al [13,14] conducted laboratory tests to assess the drainage properties of different pavement materials including porous asphalt mixtures, following the principles of the falling head permeability test. The authors [6] also conducted field infiltration tests on four sites using the "fitted tank", depicted in Figure 1d.…”

“…Using the equipment shown in Figure 3, Fwa et al [13,14] conducted laboratory tests to assess the drainage properties of different pavement materials including porous asphalt mixtures, following the principles of the falling head permeability test. For standard permeability tests on soils, the soil is normally assumed to exhibit laminar flow, and thus Darcy's law can be applied to evaluate the hydraulic conductivity.…”

Stormwater Quality Benefits of a Permeable Friction Course

“…Particles from the roadway are collected in the pores of the pavement as runoff flows through the overlay. The particles are generally sand or debris from tires (Fwa et al, 1999). It is recommended that PFC is used on high-speed roadways since the tires create pressure and suction that has a cleaning effect which slows the clogging of the pores (Pagotto et al, 2000).…”

Laboratory and Field Evaluation of Porous Asphalt Mixes

“…Functionality of PAC mixtures includes properties related to drainability and surface friction. Drainability and noise reduction effectiveness are the main functional properties of PAC mixtures that justify using these mixtures as surface layers in asphalt pavements (Fwa et al 1999;Masad et al 2004). However, raveling is the distress most frequently reported as the cause of failure in PAC mixtures (Isenring et al 1990;Sprinkel et al 2015).…”