JPS58219261A - Cutback-type composition for adding to regenerated paving material - Google Patents

Abstract

PURPOSE:To provide the titled composition which can be used as an additive to an asphalt mixture without limitation on the aging degree of the mixture, and also can be used for the preparation of regenerated asphalt mixture at normal temperature, by compounding a petroleum-type softener with a surface active agent and a petroleum-type solvent, etc. CONSTITUTION:100pts.wt. of a heated and molten petroleum-type softener, preferably a material having a composition similar to the maltene fraction of asphalt, is mixed with a small amount (e.g. 0.1-3pts.wt.) of a surface active agent (e.g. aliphatic monoamine). After cooling the mixture (e.g. at <=120 deg.C), 3- 50pts.wt. of a petroleum-type solvent and 0-50pts.wt. of a halogenated hydrocarbon solvent (e.g. methylene chloride) are added to the mixture and mixed by stirring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutback type recycled additive compact for paving recycled asphalt mixtures intended for high-grade pavements, simple pavements, bridge pavements, airport pavements, and the like.

In recent years, with the trend toward resource and energy conservation, recycling of aged or unnecessary waste asphalt mixtures has been reconsidered.

The asphalt in the asphalt mixture, which is old pavement waste from existing construction, contains maltene fraction (
Refers to a substance consisting of a polar fraction, an aromatic fraction, and a saturated fraction that are soluble in n-pentane. ) is oxidized or converted to asphaltone (insoluble matter in n-pentane), and as a result, the maltene fraction in the asphalt mixture becomes relatively insufficient compared to the original asphalt in terms of chemical composition. This may result in deterioration of physical properties or deterioration of stress relaxation performance. Therefore, by adding a regenerating additive material having physical properties close to those of the maltene fraction to the asphalt mixture, the asphalt can be recovered and regenerated to have physical properties close to those of the original asphalt.

There are two main types of regeneration for asphalt mixtures: central plant methods and on-road methods.

The central plant method is a method of recycling in a special or conventional type of plant, in which the waste asphalt mixture is accumulated in a stockyard, then shredded by crushing equipment or thermal crushing, and classified. Add and mix supplementary materials such as new aggregate, straight asphalt and recycled additives.

In addition, the on-road method involves cutting part or all of the asphalt mixture from the existing pavement on site, and supplementing the cutting waste alone or with missing aggregate, strained asphalt, asphalt mixture, recycled additives, etc. The materials are added, mixed, and then laid and compacted.

However, in the central plant method and on-road method that use recycled additives, when producing a recycled asphalt mixture, supplementary materials such as straight asphalt and recycled additives are heated and melted and passed through a nozzle. Since it is used after its viscosity has been reduced to a level that allows it to be spread and to form a film with aggregate, it has the drawback of requiring extra fuel and processes to heat the supplementary material.

The present invention was made to solve the above-mentioned drawbacks, and its purpose is to be able to be used in a wide range of applications regardless of the degree of aging of the asphalt mixture, which is waste material, and to
An object of the present invention is to provide a cutback type recycled additive composition for paving that can be used at room temperature by heating and bending the recycled additive as a supplementary material when producing a recycled asphalt mixture.

In order to achieve the above object, the present invention provides a petroleum-based softener 1
It is characterized by adding and mixing 3 to 50 parts by weight of a petroleum solvent, 0 to 50 parts by weight of a halogenated hydrocarbon, and a small amount of a surfactant to 00 parts by weight.

The cutback type reclaimed additive composition for pavement according to the present invention will be explained below. Use as wood.

1 Petroleum-based softeners are distilled oils obtained by separating low-boiling fractions from crude oil through an atmospheric distillation column, and distilling the heavy crude oil remaining at the bottom of the atmospheric distillation column under reduced pressure. is the type of crude oil,
They are classified into paraffinic softeners, naphthenic softeners, and aromatic softeners depending on the treatment process and formulation, but all of these can be used in the present invention.

Among the petroleum softeners, it is preferable to use one having a chemical composition close to that of the maltene fraction in asphalt.

Alternatively, a petroleum softener to which rubber or resin has been added may be used.

2. As the petroleum solvent, common solvents such as kerosene and other light oils obtained by fractional distillation of petroleum crude oil, naphtha, kijiroll and doluol can be used.

3. As the halogenated hydrocarbon solvent, chlorinated hydrocarbons such as methylene chloride, perchloroether, perchlorethylene, dichloride ethane, trichloride ethane, dichloride propane, and trichlorethylene ethylene can be used.

4. Surfactants include aliphatic monoamines, aliphatic diamines, aliphatic triamines, and aliphatic amides.

Use quaternary ammonium salt etc.

The present invention, which consists of such components, consists of the following composition. That is, 3 to 50 parts by weight of petroleum solvent and 0 to 5 parts by weight of halogenated hydrocarbon solvent per 100 parts by weight of petroleum softener.
Add and mix 50 parts by weight and a small amount of surfactant, for example (11-3 parts by weight).

Next, each embodiment of the present invention will be described in detail.

First, in the first example, 0.5 parts by weight of unsaturated tallow triamine as a surfactant was added and mixed to 100 parts by weight of a heated and melted petroleum aromatic softener, and then 12 parts by weight of unsaturated tallow triamine was added as a surfactant.
After cooling to below 0°C, add 20 parts by weight of kerosene as a petroleum solvent and stir to dissolve. Add 5 parts by weight of perchlorethylene as a halogenated hydrocarbon solvent and stir thoroughly to make it uniform. In this way, a cut bank type recycled additive composition for pavement according to the present invention is obtained.

Then, an asphalt mixture having a fine particle size composition, which is waste material from existing pavements, was heated and crushed in a drying oven at 170°C, and the above-mentioned cut bank type recycled additive composition for pavement was mixed to make an old asphalt mixture. obtain. The physical properties of the recycled asphalt mixture obtained as in Part B are shown in the table below.
Shown in 1.

In the second example, 0.5 parts by weight of unsaturated tallow diamine as a surfactant was added to 100 parts by weight of a heat-melted petroleum-based aromatic softener containing 70 parts of synthetic rubber latex in terms of solid content. 25 parts by weight of naphtha as a petroleum solvent was added, stirred and dissolved, and 7 parts by weight of ethane dichloride was added as a halogenated hydrocarbon solvent. By thoroughly stirring and making the mixture uniform, the cutback type recycled additive composition for pavement according to the present invention is obtained.

Then, a recycled asphalt mixture is obtained in the same manner as in the first example using this cut bank type recycled additive composition for pavement. The physical properties of the recycled asphalt mixture thus obtained are shown in Table 1 below.

In the third example, 0.0 parts by weight of a quaternary ammonium salt as a surfactant was added to 100 parts by weight of a heat-melted petroleum-based aromatic softener containing 5 parts of ethylene-vinyl acetate copolymer resin.
After adding 5 parts by weight, uniformly dissolving and cooling to 120°C or below, adding 30 parts by weight of kerosene as a petroleum solvent and stirring to make it uniform, the cantback type recycled additive composition for pavement according to the present invention is prepared. get something

Then, a recycled asphalt mixture is obtained in the same manner as in the first example using this cutback type recycled additive composition for pavement. The physical properties of the recycled asphalt mixture thus obtained are shown in Table 1 below.

The test method for the recycled asphalt mixture was in accordance with the Asphalt Pavement Guidelines published June 13, 1980, and the test specimens were cured indoors for one week before testing. In addition, in the comparative example shown in Table 1, a petroleum-based aromatic softener as a pavement recycling additive was heated and dissolved to 130°C, and a fine-grained mixture of scrap wood was prepared in the same manner as in the first example. This is a recycled asphalt mixture obtained by mixing with an asphalt mixture having

Table 1 As mentioned above, according to the cant bank type recycled additive composition for pavement according to the present invention, for 100 parts by weight of petroleum softener,
By adding and mixing 3 to 50 parts by weight of a petroleum solvent, 0 to 50 parts by weight of a non-logenated hydrocarbon solvent, and a small amount of surfactant, the cant bank type recycled additive for pavement of the present invention can be used at room temperature. Since a recycled asphalt mixture can be obtained using the composition, the heating process of the recycled additive composition can be omitted during the manufacturing process of the recycled asphalt mixture or during the construction process, which has a significant effect on saving equipment and fuel. do.

In addition, as can be seen from the comparison of physical properties between each example and comparative example shown in Table 1, sufficient maltene fraction is added to the reclaimed asphalt mixture from waste materials, making it possible to create a recycled asphalt mixture suitable for paving. I wonder if there are any effects that can be obtained (
In addition, since the cutback type recycled additive composition for pavement contains a surfactant, it can be applied to asphalt mixtures cut from existing pavements, as well as asphalt mixtures from waste materials that have become wet due to rain, etc. The same effect as described above can also be obtained.

Patent applicant: Toa Road Industry Co., Ltd. Agent: Patent attorney: Takashi Kanekura Second procedural amendment c
Form) October 2611, 1981 Kazuo Wakasugi, Commissioner of the Patent Office1, Indication of the case: Patent Application No. 100757, filed in 19822, Title of the invention: Cutback type recycled additive composition for pavement 3, Person making the amendment Relationship with A1: Patent applicant 4, agent 5, date of amendment order: September 28, 1980. Furthermore, the KN'N method for recycled asphalt mixtures is based on the Asphalt Paving Guidelines issued on June 13, 1988. It is a method according to
The specimen was kept indoors for one week and then tested.

In addition, in the comparative example shown in Table 1, a petroleum-based aromatic softener as a pavement regeneration additive was heated to 130°C and then mixed with fine particles, which is waste material, in the same manner as in the first example. This is a recycled asphalt compound obtained by mixing with an asphalt mixture having

Table-1

Claims (1)

[Claims] 1. 3 parts of petroleum solvent per 100 parts by weight of petroleum softener
1. A cantbank-type regenerating additive composition for pavement, which is characterized in that it is mixed with ~50 parts by weight of a halogenated hydrocarbon solvent, and a small amount of a surfactant.