ASTM C1781/C1781M-21 PDF Download

The ASTM C1781/C1781M-21 standard is a test method that is used to determine the surface infiltration rate of permeable unit pavement systems. This standard specifically applies to permeable unit pavement systems that are surfaced with solid interlocking concrete paving units, concrete grid paving units, or clay paving brick.

The standard provides guidance on how to test the field surface infiltration rate of these types of permeable pavements. It also includes a note which states that if the pavement is made of pervious concrete, a different test method (ASTM C1701/C1701M) should be used, which is functionally identical to this standard but does not include the provisions for positioning and securing the test ring to a discontinuous surface.

It should be noted that the explanatory notes provided within the test method are not considered as requirements of the standard. These notes are meant to provide additional information and clarification.