Modifiers adjust selected binder properties. The catalogue profiles cover polymer-modified paving binders described by PG grades. A PG designation alone does not prove modification; specify the polymer system and required tests. Rubber-modified and other systems can be reviewed separately. Review the requested performance profile together with evidence of the specified modification and compatibility with the mix design. Include the application, required grade and any ageing or deformation tests in the enquiry; a similar grade name is not enough to establish equivalence.
Reference limits from the SRNT catalogue, not measured batch results or a COA. Availability, the applicable standard edition and contractual limits are confirmed for each enquiry.
| Property / condition | Unit | Reference limit | Test method |
|---|---|---|---|
| PAVEMENT DESIGN TEMPERATURES | |||
| Average 7-day maximum pavement temperature | °C | 76 | Grade designation |
| Minimum pavement design temperature | °C | -22 | Grade designation |
| ORIGINAL BINDER | |||
| Flash point (Cleveland open cup) | °C | ≥230 | AASHTO T48 |
| Rotational viscosity at 135°C | Pa·s | ≤3.00 | AASHTO T316 |
| DSR, G*/sinδ at 76°C, 10 rad/s | kPa | ≥1.00 | AASHTO T315 |
| AFTER RTFO AGING | |||
| Mass change (absolute value) | mass % | ≤1.00 | AASHTO T240 |
| DSR, G*/sinδ at 76°C, 10 rad/s | kPa | ≥2.20 | AASHTO T315 |
| AFTER PAV AGING OF RTFO RESIDUE | |||
| PAV conditioning temperature¹ | °C | 100 / 110 | AASHTO R28 |
| DSR, G*·sinδ at 31°C, 10 rad/s | kPa | ≤5000 | AASHTO T315 |
| BBR creep stiffness, S at -12°C, 60 s | MPa | ≤300 | AASHTO T313 |
| BBR m-value at -12°C, 60 s | - | ≥0.300 | AASHTO T313 |
| Physical hardening at -12°C, 24 h | - | Report | AASHTO T313 |
| Direct tension² at -12°C, 1 mm/min | % strain | ≥1.0 | AASHTO T314 |
¹ PAV conditioning follows the specified climatic protocol; 110°C may be required for desert climates.
² Where permitted by the contract specification, direct tension can replace the stiffness limit when S is 300-600 MPa; the m-value requirement still applies.
Polymer modification must be confirmed in the product documentation. Elastic recovery, separation stability and M332 / MSCR traffic requirements follow the project specification; no universal extra limit is assumed here.
The contract standard and edition govern acceptance. DSR: dynamic shear rheometer. BBR: bending beam rheometer. RTFO: rolling thin-film oven. PAV: pressure aging vessel.
