Asphalt penetration number
Asphalt Penetration Testing, Penetrometers and Needles
Description: Link to Active This link will always route to the current Active version of the standard. Penetration Grading The penetration grading system was developed in the early s to characterize the consistency of semi-solid asphalts. Chipseal involves spraying the road surface with asphalt emulsion followed by a layer of crushed rock, gravel or crushed slag. Michael Hogan ''Morro Creek'', ed.