Modified asphalt meeting PG 82-22 grade, and preparation method thereof

Abstract

The present invention discloses a modified asphalt and a preparation method thereof, wherein the modified asphalt comprises, by mass, 100 parts of 50# asphalt, 4-6 parts of a styrene-butadiene block copolymer, 0.5-3 parts of a component A, and 0.1-0.5 part of a stabilizer, wherein the component A is selected from polyethylene or polyphosphoric acid. The preparation method comprises: sequentially carrying out shear treatment and stirring development so as to obtain the modified asphalt. According to the present invention, the PG high temperature grade of the asphalt product is improved with the selection of the 50# asphalt, the high temperature performance of the modified asphalt is improved with the selection of the PE or polyphosphoric acid, the penetration degree of the obtained modified asphalt is low, the softening point of the obtained modified asphalt is high, the PG grade can achieve PG 82-22, the high temperature performance is good, and the high temperature rutting resistance is good.

Description

technical field

[0001] The invention belongs to the field of modified asphalt preparation, and in particular relates to a modified asphalt conforming to PG82-22 grade and a preparation method thereof. Background technique

[0002] At present, the early disease of the asphalt pavement of expressway in our country is rutting as the main form, especially on the expressway with heavy load, high temperature and channelized traffic. The maintenance cost of road milling and resurfacing caused by rutting is increasing at a high rate rate increases year by year.

[0003] Asphalt is a viscoelastic material. As the temperature increases, especially as the load action time and number of actions increase, asphalt gradually approaches the plastic body, and its stiffness modulus will be greatly reduced, and its resistance to deformation will drop sharply, resulting in rutting. Such as permanent deformation. In order to solve the rutting disease, the commonly used method is to modify the ...

Examples

Embodiment 1

[0045] Embodiment 1, prepare the modified asphalt of PG82-22 grade:

[0046] The preparation method of the modified bitumen conforming to PG82-22 grade specifically comprises the following steps:

[0047] 1) Raw material preparation: Weigh 100 parts of No. 50 bitumen, 4 parts of SBS, 3 parts of PE and 0.35 parts of stabilizer according to the parts by mass, and set aside;

[0048]2) Preparation of modified asphalt: heat No. 50 asphalt to 185°C; then slowly add SBS and PE into No. HMD stabilizer, and stirred and developed at 180°C and 1000rpm for 5 hours, kept stirring and gradually lowered the temperature, and prepared modified asphalt conforming to PG82-22.

Embodiment 2

[0049] Embodiment 2, prepare the modified asphalt of PG82-22 grade:

[0050] The preparation method of the modified bitumen conforming to PG82-22 grade specifically comprises the following steps:

[0051] 1) Raw material preparation: Weigh 100 parts of No. 50 bitumen, 5 parts of SBS, 1 part of PE and 0.4 part of stabilizer according to the parts by mass, and set aside;

[0052] 2) Preparation of modified asphalt: heat No. 50 asphalt to 185°C; then slowly add SBS and PE into No. Industrial-grade sulfur powder, and stirred at 180°C and 2000rpm for 4 hours, kept stirring and gradually lowered the temperature to prepare modified asphalt that meets PG82-22.

Embodiment 3

[0053] Embodiment 3, prepare the modified asphalt of PG82-22 grade:

[0054] The preparation method of the modified bitumen conforming to PG82-22 grade specifically comprises the following steps:

[0055] 1) Raw material preparation: Weigh 100 parts of No. 50 bitumen, 4 parts of SBS, 1 part of polyphosphoric acid and 0.3 part of stabilizer according to the parts by mass, and set aside;

[0056] 2) Preparation of modified asphalt: heat No. 50 asphalt to 185°C; then slowly add SBS to No. anhydride, and stirred at 180°C and 2000rpm for 4 hours, and finally, added polyphosphoric acid at 170°C, and kept stirring at 170°C for 2 hours, kept stirring and gradually lowered the temperature, and prepared modified asphalt conforming to PG82-22.

technical field

[0001] The invention belongs to the field of modified asphalt preparation, and in particular relates to a modified asphalt conforming to PG82-22 grade and a preparation method thereof. Background technique

[0002] At present, the early disease of the asphalt pavement of expressway in our country is rutting as the main form, especially on the expressway with heavy load, high temperature and channelized traffic. The maintenance cost of road milling and resurfacing caused by rutting is increasing at a high rate rate increases year by year.

[0003] Asphalt is a viscoelastic material. As the temperature increases, especially as the load action time and number of actions increase, asphalt gradually approaches the plastic body, and its stiffness modulus will be greatly reduced, and its resistance to deformation will drop sharply, resulting in rutting. Such as permanent deformation. In order to solve the rutting disease, the commonly used method is to modify the ...

Examples

Embodiment 1

[0045] Embodiment 1, prepare the modified asphalt of PG82-22 grade:

[0046] The preparation method of the modified bitumen conforming to PG82-22 grade specifically comprises the following steps:

[0047] 1) Raw material preparation: Weigh 100 parts of No. 50 bitumen, 4 parts of SBS, 3 parts of PE and 0.35 parts of stabilizer according to the parts by mass, and set aside;

[0048]2) Preparation of modified asphalt: heat No. 50 asphalt to 185°C; then slowly add SBS and PE into No. HMD stabilizer, and stirred and developed at 180°C and 1000rpm for 5 hours, kept stirring and gradually lowered the temperature, and prepared modified asphalt conforming to PG82-22.

Embodiment 2

[0049] Embodiment 2, prepare the modified asphalt of PG82-22 grade:

[0050] The preparation method of the modified bitumen conforming to PG82-22 grade specifically comprises the following steps:

[0051] 1) Raw material preparation: Weigh 100 parts of No. 50 bitumen, 5 parts of SBS, 1 part of PE and 0.4 part of stabilizer according to the parts by mass, and set aside;

[0052] 2) Preparation of modified asphalt: heat No. 50 asphalt to 185°C; then slowly add SBS and PE into No. Industrial-grade sulfur powder, and stirred at 180°C and 2000rpm for 4 hours, kept stirring and gradually lowered the temperature to prepare modified asphalt that meets PG82-22.

Embodiment 3

[0053] Embodiment 3, prepare the modified asphalt of PG82-22 grade:

[0054] The preparation method of the modified bitumen conforming to PG82-22 grade specifically comprises the following steps:

[0055] 1) Raw material preparation: Weigh 100 parts of No. 50 bitumen, 4 parts of SBS, 1 part of polyphosphoric acid and 0.3 part of stabilizer according to the parts by mass, and set aside;

[0056] 2) Preparation of modified asphalt: heat No. 50 asphalt to 185°C; then slowly add SBS to No. anhydride, and stirred at 180°C and 2000rpm for 4 hours, and finally, added polyphosphoric acid at 170°C, and kept stirring at 170°C for 2 hours, kept stirring and gradually lowered the temperature, and prepared modified asphalt conforming to PG82-22.

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