Tolerances, test frequencies for finished asphalt and conformity assessment

7 Tolerances, test frequencies for finished asphalt and conformity assessment 

For tolerances from the target composition and test frequencies for conformity assessment, see Section 5.4.1.6. 

OGFCs may also be placed to reduce the tyre-pavement interface noise and may also be placed to reduce the occurrence and severity of reflective cracking. 

The mix design is based on the volumetric properties of the mix and particularly on air voids (void content) and the presence of stone-on-stone contact. The specimens are compacted by a gyratory compactor or another compactor providing equivalent compacted density. 

According to ASTM D 6932 (2008), the binder content of an OGFC mixture typically ranges from 5% to 7% when paving grade bitumen is used, from 6% to 8% when modified bitumen is used or from 8% to 10.5% when bitumen-rubber is used. 

---