Water-damage-resistant recycled aggregate asphalt concrete and preparation method thereof
An asphalt concrete and recycled aggregate technology, applied in the field of asphalt concrete materials, can solve the problems of poor water damage resistance of recycled aggregate asphalt concrete and insufficient recycling of waste plastics, so as to reduce the risk of rain-load damage and improve the resistance to The effect of exfoliation and easy industrial operation
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Embodiment 1
[0028] Heat 70# base asphalt to a molten state at 150°C, then add modified PET additive equivalent to 1% of the asphalt mass, and stir for 5 minutes to obtain PET modified asphalt.
[0029] Quantitatively weigh 52g PET modified asphalt, 397.28g recycled coarse aggregate, 510.64g natural fine aggregate and 38g natural mineral powder. According to the designed mixing ratio, the PET modified asphalt, aggregate and mineral powder kept heated and melted, were mixed at 150°C to obtain water damage-resistant recycled aggregate asphalt concrete.
[0030] In order to fully understand the performance of the recycled aggregate asphalt concrete, the physical properties of 1wt% PET modified asphalt and its mixture were tested according to the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTJE20-2011).
[0031] The softening point of 1wt% PET modified asphalt is 47.4°C, the penetration at 25°C is 65dmm, and the Brookfield rotational viscosity at 135°C is 0.49Pa...
Embodiment 2
[0033] Example 2 is basically the same as Example 1, except that the modified PET additive is added in an amount of 2wt% in the recycled aggregate asphalt concrete.
[0034] Under the same test conditions, the softening point of 2wt% PET modified asphalt is 47.8°C, the penetration at 25°C is 65dmm, and the Brookfield rotational viscosity at 135°C is 0.51Pa·s. The residual ratio of soaked Marshall stability of recycled aggregate asphalt concrete is 93.6%, the freeze-thaw splitting strength ratio is 85.7%, and the splitting tensile strength is 1.16MPa, which fully meets the relevant requirements of "Technical Specifications for Construction of Highway Asphalt Pavement". It can be seen that, compared with Example 1, increasing the amount of modified PET additives within a certain range will not significantly improve the water damage resistance of recycled aggregate asphalt concrete, but the ability to resist damage is somewhat improved. promote.
Embodiment 3
[0036]Example 3 is basically the same as Example 1, except that the modified PET additive is added in an amount of 3wt% in the recycled aggregate asphalt concrete.
[0037] Under the same test conditions, the softening point of 3wt% PET modified asphalt was 48.1°C, the penetration at 25°C was 63dmm, and the Brookfield rotational viscosity at 135°C was 0.55Pa·s. The residual ratio of soaked Marshall stability of recycled aggregate asphalt concrete is 94.0%, the freeze-thaw splitting strength ratio is 86.9%, and the splitting tensile strength is 1.33MPa, which fully meets the relevant requirements of "Technical Specifications for Highway Asphalt Pavement Construction". It can be seen that, compared with Example 2, continuing to increase the amount of modified PET additives will not continue to significantly improve the water damage resistance of recycled aggregate asphalt concrete, but its resistance to damage is still improved .
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