A kind of high permeability anti-aging modifier and preparation method thereof

Abstract

The invention is applied to the field of road engineering materials, and discloses a high-permeability anti-aging modifier which is prepared from the following raw materials in parts by mass: 35-45 parts of a light component, 4-6 parts of a permeation promoting component, 20-25 parts of a plastification component, 4-5 parts of a tolerance component, 5-10 parts of an anti-aging component, 4-8 parts of water and 18-25 parts of an SBS component. The permeation effect of the high-permeability anti-aging modifier on aged asphalt is improved by virtue of polarization treatment of the light component, the regeneration effect is improved, meanwhile secondary aging of regenerated alphabet in the mixing and service process, and moreover the adhesion and toughness property of alphabet is improved. The Marshall stability of an anti-aging regenerated alphabet mixed material is up to 12KN, the flexural-tensile strain of the anti-aging regenerated alphabet mixed material is up to 2568mu epsilon, the anti-aging property of the anti-aging regenerated alphabet mixed material is remarkably improved, and application of a high-volume regenerated alphabet mixed material in a road surface layer structure is possible.

Description

technical field [0001] The invention is applied to the field of road engineering materials, and in particular relates to a preparation method of an anti-aging modifier for heat regeneration of asphalt pavement, and its application (for preparing heat regeneration mixture). Background technique [0002] With the rapid development of my country's infrastructure construction in recent decades, a large number of urban roads and intercity expressways have been built since the 1990s, making my country's total mileage per kilometer rank first in the world, and the national expressway network has basically been completed. The domestic asphalt pavement paved in the early stage has entered the stage of maintenance, repair and renovation. It is estimated that during the national "13th Five-Year Plan" period, more than 41% of the total mileage of asphalt roads in my country will need to be renovated, and the waste asphalt mixture produced will be It has reached 3.6 billion tons, and the ...

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Problems solved by technology

[0003] Although the current cold recycling method increases the utilization rate of waste asphalt mixture, the waste asphalt concrete is used as black material, and the aged asphalt in it has not been reused. The mechanical properties, road performance and durability of the prepared recycled pavement Poor, short service life, can only be used on low-grade road pavement or grassroots, and the cost of recycling after 3-4 years is greatly increased, which limits its popularization and application

Therefore, thermal regeneration technology is favored by more relevant departments. Generally, the regeneration agent is used in petroleum by-products rich in aromatics, vegetable oil, industrial and domestic waste oil, and can improve the softening point and penetration of aged asphalt. Partial performance recovery, but this regenerant has no significant compatibility with aged asphalt. During the regeneration construction and mixing process, it is easily volatilized by the influence of high temperature, resulting in poor regeneration effect. The effect of ultraviolet light, etc., causes thermal degradation and oxidation reaction of light components, accelerates the aging of recycled asphalt, and seriously affects the durability of pavement

At the same time, the amount of waste asphalt used in hot-mix regeneration is high, and the gradation is unstable. Different mixing conditions make the gradation of the mixture different, resulting in the actual distribution of the prepared mixture aggregate, resulting in a large difference in the performance of the mixture. , which is quite different from the expected effect, and there are problems such as insufficient stability and poor durability.

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