A kind of high temperature anti-rutting modified asphalt and its preparation method

Abstract

The invention provides a high-temperature anti-rutting modified asphalt and a preparation method thereof. Two kinds of crystalline polymers are used to prepare the modified asphalt with phase change heat absorption effect, which specifically includes the following raw materials in parts by weight: base asphalt 65~100 parts, 0-10 parts of polyethylene, and 0-10 parts of polyethylene glycol, and the polyethylene and polyethylene glycol cannot be zero at the same time. Among them, polyethylene glycol and polyethylene are phase change materials at the same time, which endows the modified asphalt material with crystalline-amorphous phase change endothermic properties, and realizes the phase change window of modified asphalt by changing the relative content of polyethylene glycol and polyethylene glycol The controllable adjustment of temperature reduces the high-temperature sensitivity of asphalt; polyethylene is used as a skeleton material to prevent macroscopic deformation of the material when it undergoes phase transition, significantly improves its high-temperature anti-rutting ability and rheological stability, and effectively prolongs the life of asphalt pavement. service life. The preparation method of the invention is simple and easy to control, the raw materials are simple and easy to obtain, easy to industrialized production, and has good application prospect.

Description

technical field

[0001] The invention belongs to the technical field of preparation of road engineering materials, and in particular relates to a high-temperature anti-rutting modified asphalt and a preparation method thereof. Background technique

[0002] By the end of 2018, my country's expressway mileage had exceeded 140,000 kilometers, ranking first in the world. Asphalt pavement accounts for more than 90% of highway pavement. As a temperature-sensitive viscoelastic material, asphalt has high viscosity at high temperature and is prone to permanent deformation when subjected to a large load. The continuous high temperature caused by global warming, the emergence of channelized traffic, and the continuous long longitudinal slope of mountainous expressways slow down the driving speed and prolong the load action time, resulting in many asphalt pavements appearing rutting, congestion, Problems such as cracks and road subsidence. Among them, the increase of heavy vehicles an...

Examples

Embodiment 1

[0029] A high-temperature anti-rutting modified asphalt is composed of the following raw materials in parts by weight: 100 parts of 70# base asphalt, 10 parts of polyethylene (HDPE), and 0 parts of polyethylene glycol (PEG-800). Among them, the molecular weight range of polyethylene is 10 4 ~10 5 g / mol, melt flow rate > 0.4 g / 10 min at 190°C.

[0030]The preparation method of the high-temperature anti-rutting modified asphalt comprises the following steps:

[0031] (1) Heat 70# base asphalt to 100°C to soften it;

[0032] (2) Add polyethylene to 70# base asphalt to obtain a mixture. After heating to 180°C, turn on the constant temperature and low-speed stirring, the stirring speed is 500rpm, and the stirring time is 30min;

[0033] (3) At the same temperature, the mixture described in step 2) was further subjected to high-speed shearing at a shearing speed of 5000 rpm and a shearing time of 2 hours to obtain the high-temperature anti-rutting modified asphalt.

Embodiment 2

[0035] A high-temperature anti-rutting modified asphalt is composed of the following raw materials in parts by weight: 100 parts of 90# base asphalt, 10 parts of polyethylene (HDPE), and 5 parts of polyethylene glycol (PEG-800). Among them, the molecular weight range of polyethylene is 10 4 ~10 5 g / mol, melt flow rate > 0.4 g / 10 min at 190°C.

[0036] The preparation method of the high-temperature anti-rutting modified asphalt comprises the following steps:

[0037] (1) Heat 90# base asphalt to 100°C for softening;

[0038] (2) Add polyethylene glycol and polyethylene to 90# base asphalt, after heating to 180°C, start constant temperature and low-speed stirring, the stirring speed is 500rpm, and the stirring time is 30min;

[0039] (3) At the same temperature, the asphalt was further subjected to high-speed shearing, the shearing speed was 5000 rpm, and the shearing time was 2 hours, to obtain the high-temperature anti-rutting modified asphalt.

Embodiment 3

[0041] A high-temperature anti-rutting modified asphalt is composed of the following raw materials in parts by weight: 100 parts of 70# base asphalt, 10 parts of polyethylene (HDPE), and 10 parts of polyethylene glycol (PEG-800). Among them, the molecular weight range of polyethylene is 10 4 ~10 5 g / mol, melt flow rate > 0.4 g / 10 min at 190°C.

[0042] The preparation method of the above-mentioned high-temperature anti-rutting modified asphalt comprises the following steps:

[0043] (1) Heat 70# base asphalt to 100°C to soften it;

[0044] (2) Add polyethylene glycol and polyethylene to 70# base asphalt to obtain a mixture. After heating to 180°C, start stirring at a constant temperature and low speed. The stirring speed is 500rpm and the stirring time is 30min;

[0045] (3) At the same temperature, further perform high-speed shearing on the mixture described in step 2), the shearing speed is 5000 rpm, and the shearing time is 2 hours, to obtain the high-temperature anti-ru...

technical field

[0001] The invention belongs to the technical field of preparation of road engineering materials, and in particular relates to a high-temperature anti-rutting modified asphalt and a preparation method thereof. Background technique

[0002] By the end of 2018, my country's expressway mileage had exceeded 140,000 kilometers, ranking first in the world. Asphalt pavement accounts for more than 90% of highway pavement. As a temperature-sensitive viscoelastic material, asphalt has high viscosity at high temperature and is prone to permanent deformation when subjected to a large load. The continuous high temperature caused by global warming, the emergence of channelized traffic, and the continuous long longitudinal slope of mountainous expressways slow down the driving speed and prolong the load action time, resulting in many asphalt pavements appearing rutting, congestion, Problems such as cracks and road subsidence. Among them, the increase of heavy vehicles an...

Examples

Embodiment 1

[0029] A high-temperature anti-rutting modified asphalt is composed of the following raw materials in parts by weight: 100 parts of 70# base asphalt, 10 parts of polyethylene (HDPE), and 0 parts of polyethylene glycol (PEG-800). Among them, the molecular weight range of polyethylene is 10 4 ~10 5 g / mol, melt flow rate > 0.4 g / 10 min at 190°C.

[0030]The preparation method of the high-temperature anti-rutting modified asphalt comprises the following steps:

[0031] (1) Heat 70# base asphalt to 100°C to soften it;

[0032] (2) Add polyethylene to 70# base asphalt to obtain a mixture. After heating to 180°C, turn on the constant temperature and low-speed stirring, the stirring speed is 500rpm, and the stirring time is 30min;

[0033] (3) At the same temperature, the mixture described in step 2) was further subjected to high-speed shearing at a shearing speed of 5000 rpm and a shearing time of 2 hours to obtain the high-temperature anti-rutting modified asphalt.

Embodiment 2

[0035] A high-temperature anti-rutting modified asphalt is composed of the following raw materials in parts by weight: 100 parts of 90# base asphalt, 10 parts of polyethylene (HDPE), and 5 parts of polyethylene glycol (PEG-800). Among them, the molecular weight range of polyethylene is 10 4 ~10 5 g / mol, melt flow rate > 0.4 g / 10 min at 190°C.

[0036] The preparation method of the high-temperature anti-rutting modified asphalt comprises the following steps:

[0037] (1) Heat 90# base asphalt to 100°C for softening;

[0038] (2) Add polyethylene glycol and polyethylene to 90# base asphalt, after heating to 180°C, start constant temperature and low-speed stirring, the stirring speed is 500rpm, and the stirring time is 30min;

[0039] (3) At the same temperature, the asphalt was further subjected to high-speed shearing, the shearing speed was 5000 rpm, and the shearing time was 2 hours, to obtain the high-temperature anti-rutting modified asphalt.

Embodiment 3

[0041] A high-temperature anti-rutting modified asphalt is composed of the following raw materials in parts by weight: 100 parts of 70# base asphalt, 10 parts of polyethylene (HDPE), and 10 parts of polyethylene glycol (PEG-800). Among them, the molecular weight range of polyethylene is 10 4 ~10 5 g / mol, melt flow rate > 0.4 g / 10 min at 190°C.

[0042] The preparation method of the above-mentioned high-temperature anti-rutting modified asphalt comprises the following steps:

[0043] (1) Heat 70# base asphalt to 100°C to soften it;

[0044] (2) Add polyethylene glycol and polyethylene to 70# base asphalt to obtain a mixture. After heating to 180°C, start stirring at a constant temperature and low speed. The stirring speed is 500rpm and the stirring time is 30min;

[0045] (3) At the same temperature, further perform high-speed shearing on the mixture described in step 2), the shearing speed is 5000 rpm, and the shearing time is 2 hours, to obtain the high-temperature anti-ru...

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