Upload time ：2022/4/14 15:22:56
Based on dynamic shear converter viscosity frequency oxidized asphalt sweeps, asphalt activity characteristics were investigated and yield coefficients were used to estimate potential optimal healing temperatures. After the fatigue healing experiment, the healing rate of asphalt at different temperatures was verified. After all, the optimum accumulation temperature of highway asphalt was established, and the healing time required for complete healing of asphalt was studied.
The study found that the irreversible and aged journey asphalt at the softening temperature is close to the Newtonian fluid state. At these temperatures, asphalt exhibits optimal fatigue and spontaneous damage, but aging of asphalt increases its optimal healing temperature;
The fatigue damage of modified asphalt can be completely recovered when the softening temperature is less than 20℃;
The journey asphalt and 90\\ 35SWH, the journey asphalt is heated at the softening temperature of 20℃, and the fatigue can be cured completely. Calculated according to the Wool and O'Connor model, the healing time corresponds to the time from asphalt healing to complete healing.
Secondly, a pipe bender is used to conduct a healing experiment on three-point bending fractures. Taking the strength growth rate as the healing principle, the 70\\354. journey oil asphalt mortar, 90\\35c. journey asphalt under different oxidized asphalt healing temperatures and different healing times are studied. slurry and SBS modified asphalt slurry, and the mechanism was analyzed.
The effect shows that when the temperature is slightly higher than that of asphalt mortar, 70\35 road asphalt mortar and 90\35S road asphalt mortar are the best quality of asphalt mortar self-healing, while SBS modified asphalt mortar reaches asphalt before self-healing temperature Has excellent self-healing skills. The self-healing mechanism of highway asphalt is different from that of modified asphalt: the self-healing mechanism of highway asphalt is mainly the viscosity of asphalt entering into cracks, and the modified SBS asphalt solution is the function of the loosening of asphalt molecules and the elastic recovery of SBS chains.
After all, three bending experiments were carried out on the asphalt mixture trabeculae with a dynamic analyzer. As a healing policy, the performance of 70\35 road asphalt oil mixture, 90\3535C road asphalt and modified SBS road asphalt material mixture was studied. Independent talent.
The experimental results show that the thermal induction of asphalt mortar is similar to that of asphalt mortar, and the thermal induction self-recovery of asphalt mixture of 70-35°C and asphalt mixture of 90-3535C-car asphalt is adjusted to the best temperature at a slightly higher softening point of asphalt. It is assumed that the softening temperature of the modified asphalt mixture is lower than that of the modified asphalt SBS modified asphalt; the asphalt mixture needs a longer self-healing time to achieve complete self-healing, this is because the asphalt It consists of the blockage of the mineral silt by the flow.If you have any other oxidized asphalt questions, please contact us for details or contact us directly.