| 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 ;
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB-253 299 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
39p |
| Abstract |
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. |
| NTIS Title Notes |
Research rept.. |
| PUB Date Free Form |
May 75 |
| Category Codes |
13C; 14B; 50C |
| NTIS Prices |
PC A03/MF A01 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
326618922 |
| Origin |
NTIS |
| Type |
CAT |
