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High-temperature anti-rutting modified asphalt and preparation method thereof

A modified asphalt, anti-rutting technology, applied in building insulation materials, building components, buildings, etc., can solve the problems of easy formation of rutting, sticky asphalt materials, etc., to prolong service life, good dispersion, and reduce high temperature sensitivity sexual effect

Active Publication Date: 2019-06-14
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a high-temperature anti-rutting modified asphalt and its preparation method, which solves the problem that existing asphalt materials are easily sticky at high temperatures and easily form ruts. The present invention The asphalt material is endowed with phase change heat absorption characteristics, so that when the external environment temperature rises on the modified asphalt pavement, the polymer undergoes crystallization-amorphous phase transition and absorbs a large amount of heat, which reduces the high temperature sensitivity of asphalt and effectively improves its high temperature resistance. Rutting ability and rheological stability

Method used

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  • High-temperature anti-rutting modified asphalt and preparation method thereof
  • High-temperature anti-rutting modified asphalt and preparation method thereof
  • High-temperature anti-rutting modified asphalt and preparation method thereof

Examples

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Effect test

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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Abstract

The invention provides high-temperature anti-rutting modified asphalt and a preparation method thereof. Two kinds of crystalline polymers are used for preparing modified asphalt with the phase changeheat absorption effects. The modified asphalt is concretely prepared from the following raw materials in parts by weight: 65 to 100 parts of substrate asphalt, 0 to 10 parts of polyethylene and 0 to 10 parts of polyethylene glycol, wherein the contents of the polyethylene and the polyethylene glycol cannot be zero at the same time; the polyethylene and the polyethylene glycol are jointly phase change materials; the crystal-amorphous phase change heat suction characteristics are given to the modified asphalt; by changing the relative content of the polyethylene and the polyethylene glycol, thecontrollable regulation of the phase change window temperature of the modified asphalt is realized; the high-temperature sensitivity of the asphalt is reduced; the polyethylene is a framework material, the occurrence of macroscopical deformation during the phase change of the material can be prevented; the high-temperature anti-rutting capability and the rheological stability of the modified asphalt are obviously improved; the service life of the asphalt pavement is effectively prolonged. The preparation method is simple; the control is easy; the raw materials are simple and can be easily obtained; the industrialized production is easy; good application prospects are realized.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L95/00C08L23/06C08L71/02
Inventor 夏天陈文强夏小超陈翔李又兵
Owner CHONGQING UNIV OF TECH
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