The following results were obtained for an asphalt binder. Determine if the binder meets the Superpave specifications for the following. Justify your answer. a) Rutting; b) Fatigue cracking and c) Low-Temp. cracking
The following results were obtained for an asphalt binder. Determine if the binder meets the Superpave specifications for the following. Justify your answer. a) Rutting; b) Fatigue cracking and c) Low-Temp. cracking
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
The following results were obtained for an asphalt binder. Determine if the binder meets the Superpave
specifications for the following. Justify your answer.
a) Rutting; b) Fatigue cracking and c) Low-Temp. cracking
Transcribed Image Text:### Rheological and Mechanical Properties of Asphalt Binders
This table presents the rheological and mechanical properties of asphalt binders at different aging stages: Original Binder, Short Term Aged Binder, and Long Term Aged Binder.
#### Rheological Properties:
1. **G* (kPa):**
- Original Binder: 0.98
- Short Term Aged Binder: 1.8
- Long Term Aged Binder: 6100
2. **Phase Angle (°):**
- Original Binder: 75
- Short Term Aged Binder: 60
- Long Term Aged Binder: 55
#### Mechanical Properties (BBR Test):
1. **S (MPa):**
- Original Binder: 280
- Short Term Aged Binder: 410
- Long Term Aged Binder: 590
2. **m (Slope of Log Creep Stiffness vs. Log Time):**
- Original Binder: 0.63
- Short Term Aged Binder: 0.55
- Long Term Aged Binder: 0.31
#### Mechanical Properties (DTT Test):
1. **Failure Strain (%):**
- Original Binder: 2.6
- Short Term Aged Binder: 1.9
- Long Term Aged Binder: 1.1
### Explanation:
- **G***: Complex modulus, indicating stiffness.
- **Phase Angle**: Indicator of viscoelastic behavior; higher values suggest more viscous behavior.
- **BBR (Bending Beam Rheometer)**:
- **S**: Stiffness at low temperatures; higher values indicate more stiffness.
- **m**: Rate of change of stiffness; lower values indicate slower rate of stiffness increase.
- **DTT (Direct Tension Test)**:
- **Failure Strain**: Indicates binder's ability to deform before cracking; higher values suggest better ductility.
This table is a useful tool for understanding how asphalt binders change with aging, impacting their performance in paving applications.
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To determine -
If the binder meets the Superpave specifications for the following
a) Rutting
b) Fatigue cracking and
c) Low-Temp. cracking
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