Steady-State Creep of Asphalt Concrete
2. Materials and Methods
2.2. Asphalt Concrete
2.3. Sample Preparation
3. Results and Discussion
3.1. Creep Curve
3.2. Steady-State Creep
3.3. Defining Relations for Steady-State Creep of Asphalt Concrete at Complex Stressed Condition
- For creep curve stage II, the asphalt concrete deformation occurred at a constant rate. The strain rate for this stage is dependent on the stress, and this dependence is satisfactorily described by a power function. The stress has a great influence on the strain rate where the increase of stress by one order increases the strain rate approximately by four orders;
- The dependences were constructed for the start point, end point, and the duration of the stage of steady-state creep on the stress. The stress also impacts greatly on the specified time characteristics, where the increase of stress by one order increases these characteristics for 4.3–4.5 orders;
- The values of viscosity for asphalt concrete were determined at various stresses. The dependence was defined for viscosity on the stress and can also be satisfactorily described by a power function. In particular, the increase of stress by one order reduces the viscosity by three orders;
- Assuming that asphalt concrete is an incompressible material, then the stress deviator is proportional to the strain rate deviator. Hence, there is a functional relationship between the stress intensity and the strain rate intensity, which does not depend on the type of stress condition. The defining relations were formulated for the steady-state creep of asphalt concrete under complex stressed conditions.
Conflicts of Interest
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|Indicator||Measurement Unit||Requirements of ST RK 1373||Value|
|Penetration, 25 °С, 100 gr, 5 s||0.1 mm||101–130||104|
|Penetration Index PI||-||−1.0, … ,+1.0||−0.34|
|Tensility at temperature:||cm||-||-|
|Dynamic viscosity, 60 °С||Pa·s||≥120||175.0|
|Indicator||Measurement Unit||Requirements of ST RK 1284 ||Value|
|Fraction 5–10 mm||Fraction 10–20 mm|
|Elongated particle content||%||≤25||13||9|
|Clay particle content||%||≤1.0||0.3||0.2|
|Indicator||Measurement Unit||Requirements of ST RK 1225||Value|
|Voids in mineral aggregate||%||≤19||14|
|Air void content in asphalt concrete||%||2.5–5.0||3.8|
|Compression strength at temperature||MPa||-||-|
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Iskakbayev, A.; Teltayev, B.; Oliviero Rossi, C. Steady-State Creep of Asphalt Concrete. Appl. Sci. 2017, 7, 142. https://doi.org/10.3390/app7020142
Iskakbayev A, Teltayev B, Oliviero Rossi C. Steady-State Creep of Asphalt Concrete. Applied Sciences. 2017; 7(2):142. https://doi.org/10.3390/app7020142Chicago/Turabian Style
Iskakbayev, Alibai, Bagdat Teltayev, and Cesare Oliviero Rossi. 2017. "Steady-State Creep of Asphalt Concrete" Applied Sciences 7, no. 2: 142. https://doi.org/10.3390/app7020142