GB/T 44357-2024 in English
VALIDTest methods of evaluation of performance grades for petroleum asphalt
- Issued on:2024-08-23
- Implemented on:2025-03-01
- File Format:PDF
- Delivery:Via email within 8 business days
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《GB/T 44357-2024石油沥青性能等级评价试验方法》由TC280（全国石油产品和润滑剂标准化技术委员会）归口，TC280SC4（全国石油产品和润滑剂标准化技术委员会石油沥青分会）执行，主管部门为国家标准委。
Introduction
Analysis of Standard Technical Framework
| Test method | Core parameters | Applicable aging stage | Temperature range |
|---|---|---|---|
| RTFOT | Mass change rate, needle penetration ratio | Short-term aging | 163℃/180℃ |
| PAV | Pressure aging index | Long-term aging | 90-110℃ |
| DSR | G*/sinδ | Original/Aged | 3-88℃ |
In-depth interpretation of key test methods
1. Rotating Thin Film Heat Aging (RTFOT)
Simulates the short-term aging of asphalt during the mixing process. The standard test conditions are 163℃×85min, and modified asphalt can be tested at 180℃. The main evaluation indicators include:
- Mass change rate ≤±1.0%
- Residual penetration ratio ≥50%
2. Pressure aging test (PAV)
Typical application case:After PAV aging of a PG76-22 modified asphalt at 100℃/2.1MPa, the DSR fatigue factor G*sinδ increased from 1.2kPa of the original asphalt to 4.8kPa, showing significant aging characteristics.
Technology evolution analysis
This standard incorporates the MSCR test into the specification system for the first time, and evaluates the delayed elastic recovery ability of asphalt through the dual stress levels of 0.1kPa/3.2kPa, replacing the single indicator of traditional DSR. The comparison data shows:
| Asphalt type | Jnr3.2(kPa-1) | Recovery rate(%) |
|---|---|---|
| SBS modified | 0.12 | 85.2 |
| Base asphalt | 2.35 | 12.6 |
Implementation suggestions
- PG grading test should follow the progressive test process of original-RTFOT-PAV
- DSR test needs to be regularly calibrated with standard silicone oil, the deviation should be ≤0.1℃
- BBR specimen demoulding temperature should be controlled within the test temperature + 10℃ range
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