Table 4 Factors and their levels.
Factor | Abbreviation | Unit | Range of variation | |||||
|---|---|---|---|---|---|---|---|---|
Level 1 | Level 2 | Level 3 | Level 4 | Level 5 | Level 6 | |||
Crumb rubber content | CRC | % | 0 | 10 | 20 | – | – | – |
Binder content | BC | % | 4 | 4.5 | 5 | – | – | – |
Temperature | T | °C | − 20 | − 15 | − 10 | − 5 | 0 | 5 |
Normalized notch offset | γ | % | 0 | 30 | 47 | – | – | – |
Aggregate type | AT | – | Limestone | Siliceous | – | – | – | – |
Nominal maximum aggregate size | NMAS | mm | 19 | 25 | – | – | – | – |
