JPH0543289A - Regenerated asphalt paving material - Google Patents

Abstract

PURPOSE:To obtain the regenerated asphalt paving material which is free from fludizing deformation phenomena at a time of high temperature and little in abrasion phenomena at a time of low temperature and difficult cause flash phenomena and fluidization phenomena. CONSTITUTION:A regenerative additive having 0.1-100 pts.wt. fiber for 100 pts.wt. petroleum-based softening agent is added to the asphalt pavement waste material. Thereby malthene fraction is replenished to a paving asphalt mixture. Aged and deteriorated asphalt is restored close to the original chemical compositional component and also resistance properties for fluidization are held.

Description

Detailed Description of the Invention

[0001]

The present invention relates to high-quality pavement, simple pavement,
Recycled asphalt pavement material for bridge surface pavement and airport pavement.

[0002]

2. Description of the Related Art In recent years, waste asphalt pavement materials that have deteriorated or become unnecessary have been recycled as resources and energy have been saved. Recycling of such asphalt pavement waste is roughly divided into a central plant system and a road system. The central plant method is a method of regenerating in a conventional type plant,
After the waste materials are accumulated in the stockyard, they are crushed or crushed in a crushing facility to be crushed and classified, and a new aggregate or strain is stored.
This is to add and mix supplementary materials such as asphalt and regeneration additives. In addition, the on-road method cuts part or all of the asphalt mixture of the existing pavement at the site, and added supplementary materials such as aggregates, straight asphalt and reclaimed additives that are lacking in this cutting waste material and mixed. The material is laid out immediately on site and compacted. However, regardless of which method is used, when a recycled asphalt mixture containing straight-line asphalt or a regeneration additive is used as an asphalt mixture for paving, if the vehicle is repeatedly subjected to repeated traffic loads, the original asphalt will be used. The durability is inferior to that of the mixture, and the road surface is deformed because the flow deformation phenomenon and the wear phenomenon are likely to occur, and it is difficult to maintain a flat road surface state for a long time. The reason for this is that in the asphalt of an asphalt mixture which is an existing pavement waste material, the marten fraction (which consists of a polar fraction, an aroma fraction and a saturated fraction of n-pentane-soluble component) in the asphalt is oxidized. Alternatively, it is polymerized to obtain asphaltene (insoluble in n-pentane).
This is because the chemical composition of the asphalt in the aged waste material asphalt mixture is relatively insufficient as compared to the original straight asphalt in terms of chemical composition. A decrease in penetration, an elongation and a softening point, and an increase in 60 ° C. viscosity are observed in comparison with asphalt. In order to regenerate an aged asphalt mixture having such physical properties, when a low-viscosity regeneration additive containing mainly martens fraction is added, a flow deformation phenomenon occurs at high temperature as compared to the new asphalt mixture, and at low temperature. A wear phenomenon easily occurs. Also, the addition of straight asphalt for regeneration requires a large addition to restore the physical properties of the original straight asphalt, resulting in excess asphalt in the regenerated asphalt mixture. As a result, there is a problem that a flash phenomenon and a flow phenomenon easily occur.

[0003]

The problem to be solved is that the recycled asphalt pavement material is liable to cause flow deformation phenomenon at high temperature and wear phenomenon at low temperature, and to be regenerated, it is necessary to add recycled additive or straightening agent. If the amount of asphalt is excessive, flash phenomenon and flow phenomenon will occur easily.

[0004]

According to the present invention, a pavement asphalt mixture is prepared by adding a regeneration additive having 0.1 to 100 parts by weight of fibers to 100% by weight of a petroleum softener to an asphalt pavement waste material. It was possible to restore deteriorated asphalt close to the original chemical composition by supplementing with martens fraction, and to impart flow resistance by the fiber.

[0005]

EXAMPLE An example of the present invention will be described below. As a regeneration additive for a regenerated asphalt mixture, it comprises the following two components, a petroleum-based softener and a fiber. (1) The petroleum-based softening agent is a distillate obtained by separating a low boiling point fraction from crude oil by a room temperature distillation column and distilling heavy crude oil remaining at the bottom of the room temperature distillation column under reduced pressure. Are classified into paraffinic petroleum-based softeners, naphthene-based petroleum-based softeners, and aromatic petroleum-based softeners, all of which can be used in the present invention.
Such petroleum-based softener has a chemical composition component close to that of the marten fraction in asphalt. (2) Fibers are classified into organic fibers and inorganic fibers.
Organic natural fibers include cellulosic fibers, hemp, cotton, etc., and organic synthetic fibers include acrylic, polyester, vinylon, polypropylene, polyethylene, etc., and engineering resin types include aramid, novoloid, etc. Inorganic natural fibers include sepiolite and rock wool
Inorganic artificial fibers such as aluminum and asbestos include metals (aluminum, stainless steel, steel, etc.), glass, ceramics (tyranno, alumina, etc.) and carbon (pitch, PAN, etc.).

Then, 0.1 to 100 parts by weight of fiber is gradually added to 100 parts by weight of a predetermined amount of the petroleum-based softening agent heated and dissolved, and kneaded to obtain a regenerated additive. By using the regenerated additive thus obtained by the central plant reclaiming method, the road reclaiming method, etc., a reclaimed asphalt pavement material having durability and fluidity resistance can be obtained.

[0007]

According to the present invention described in detail above, by adding a fibrous regeneration additive having 0.1 to 100 parts by weight of fibers to 100 parts by weight of a petroleum-based softener to an asphalt pavement waste material. Since the martens fraction is sufficiently added to the waste asphalt pavement material, the deteriorated asphalt can be restored to its original chemical composition. In addition, the addition of fibers increases the viscosity of the asphalt mixture and the entanglement of the fibers increases the gripping force of the aggregate, resulting in extremely high resistance to flow, embrittlement and abrasion, forming a durable asphalt pavement. Has the effect of being able to.

Claims (1)

[Claims] 1. A recycled asphalt pavement material, wherein a recycled additive having 0.1 to 100 parts by weight of fibers is added to a waste asphalt pavement material with respect to 100 parts by weight of a petroleum softener.