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Appendix B 4.2 Cone and Quartering

After mixing, the mix is placed onto a splitting tray (Figure B 3). If the mixing bowl can be up‑ended on to the tray so as to leave the mix in a conical shape then no further mixing of the mix is required. If the mix is transferred from the mixer to the splitting tray by scoops then the whole mix needs to be quickly formed into a cone (avoiding segregation).

Figure B 3: Tools for splitting mix into sub-samples

Splitting of the mix is done using a flat steel plate. The mix is divided into ‘roughly’ four equal portions.

Having split out the four portions, these are then scooped (using a square-mouthed high-sided scoop) into trays for conditioning. The conditioning trays should be between 100 and 200 mm in diameter and the use of a lid is optional.

It is important to split the mixes and place the portions back in the oven quickly in order to conserve the temperature of the asphalt mix.

If additional samples are required for other purposes then three of the samples should be marked as the standard quality indicator samples. These samples should be monitored closely to ensure compliance with the standards. Additional samples may be manufactured for other purposes and it is the responsibility of the supervising authority to determine what practices need to be adopted.