Record Display for the EPA National Library Catalog


Main Title Flow Resistivity and Porosity Testing of Surface Materials.
Author Brown, Ron ; Lee, Mark C. ; Sutherland., Louis C. ;
CORP Author Wyle Research, El Segundo, Calif.;Environmental Protection Agency, Washington, D.C.
Year Published 1975
Report Number WRC-75-8; EPA-68-01-2449;
Stock Number PB-253 299
Additional Subjects Construction materials ; Porosimeters ; Flow measurement ; Bituminous concretes ; Gravel ; Soils ; Sands ;
Library Call Number Additional Info Location Last
NTIS  PB-253 299 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 39p
Flow resistivity and porosity measurements have been performed on a variety of ground surface materials using a forced airflow apparatus and a microglass-bead-calibrated porosity instrument. It is found that the flow resistivity ranges from over 1,000,000 cgs rayls/cm for concrete down to less than 100 for sand and gravel. The porosity ranges from 0.4 for dry soil to less than 0.01 for concrete. Based on these measurements, the normal absorption coefficient for a 200 Hz acoustic wave is less than 0.2 for all of the materials tested except gravel, the value of which is approximately 0.4. For standard asphalt utilized for surface pavement, for instance, the estimated normal absorption coefficient is found to be less than 0.01.