ASTM C1781/C1781M-18e1 PDF Download

The ASTM C1781/C1781M-18e1 standard provides a method for determining the field surface infiltration rate of permeable unit pavement systems. This test method is applicable for new systems to assess their acceptance and for conducting tests over multiple years to monitor any reduction in infiltration rate, indicating the need for remedial maintenance.

The infiltration rate obtained through this method is specific to the localized area of the pavement where the test is conducted. To assess the overall surface infiltration rate of the entire permeable pavement, testing must be performed at multiple locations, and the results should be averaged.

The standard highlights that the minimum acceptable infiltration rate is typically determined by the design engineer or municipality and may be influenced by the design precipitation event.

Additionally, this test method can be used to demonstrate the infiltration rate of a specific permeable unit pavement system when the drainage joints are filled with the specified aggregate for that system.

The standard also includes explanatory notes, which should not be considered as requirements of the test method. It is worth noting that for in-place pervious concrete, Test Method C1701/C1701M should be used, as it provides similar results but does not incorporate the provisions for positioning and securing the test ring to a discontinuous surface outlined in this standard.