JPH0229801B2 - HOSOGOZAINOSEIZOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a paving mixture used for paving roads.

(Prior Art and Background) Asphalt concrete, which uses asphalt as a binder, is widely used as a road surface paving material. Asphalt concrete is generally solid at room temperature, so it is heated to a temperature of 100-odd degrees to over 200 degrees before use. However, asphalt concrete becomes brittle and even liquefies when exposed to high temperatures, resulting in poor stability.

Therefore, heated asphalt composite materials are now being used that use modified asphalt mixed with rubber, thermoplastic resin, etc. as a binder to improve the stability of the composite material. This composite material maintains its stability even when heated, but like asphalt concrete, it must be heated during construction, which affects workability.

On the other hand, room-temperature paving composite materials, which can be constructed at room temperature, are also widely used. This composite material uses an asphalt emulsion made by emulsifying asphalt with a surfactant, and cutback asphalt containing a solvent as a binder, and after paving, it obtains stability by waiting for the water and solvent to volatilize. be. However, this composite material requires solvents such as water and solvents, so it is several steps inferior in stability and has poor storage stability.
Usage is limited.

(Problems to be Solved by the Invention) The present invention solves the disadvantages of workability due to the heating of heated asphalt mixture, which is commonly used, and the poor storage stability due to the use of a solvent for room-temperature paving mixture. The present invention aims to provide a method for producing a paving composite material that has the excellent properties of a heated asphalt composite material and the easy workability of a room-temperature paving composite material.

[Structure of the invention]

(Means for Solving the Problems) The present invention has its constituent elements, such as kneading aggregate and a binder that is a mixture of liquid asphalt with rubber and thermoplastic resin, and coating the aggregate with the binder. By kneading mineral oil with a polarity different from that of the rubber contained in the rubber, and forming a layer of mineral oil around the binder coating. Solve problems.

(Function) The binder which is a component of the present invention, which is a mixture of liquid asphalt with rubber and thermoplastic resin, has the same composition as the binder of the heated asphalt mixture. Since this binder is a semi-solid material with adhesive strength, a considerable amount of labor is required to pave the composite material using this binder firmly at room temperature.

Mineral oil plays an important role in improving workability. Mineral oil has good compatibility with asphalt, which is the binder base material. In order to ensure workability, mineral oil is incompatible with the binder and coated around the binder coated with aggregates, which makes it easier to slip. It is better to incorporate and integrate them in terms of stability.

A combination of binder and mineral oil meets both of these requirements.

Mineral oils having a polarity different from that of the rubber contained in the binder are selected and combined.
If there is a difference in polarity value, there will be a difference in solubility coefficient, and compatibility is low, so mineral oil forms a layer of mineral oil around the binder coated with aggregate, making it difficult to dissolve into the binder, and causing a surface film. Since it is in a formed state, it is easy to slip and workability can be ensured. When used for paving, compaction causes forced friction, and the mineral oil layer around each aggregate is destroyed. Mineral oil is compatible with asphalt, so it is forcibly incorporated into the binder and becomes one piece.

(Example) Next, embodiments of the present invention will be described.

First, crushed stone and sand as aggregates heated to 120°C to 130°C are put into a mixer in the required amount, and a filler such as calcium carbonate is also put into the mixer.
After that, the binder shown in the recipe table is heated to 80°C to 150°C and put into a mixer, and the whole is mixed. At this time, the surface of the aggregate is covered with a binder layer impregnated with filler or the like. After this, mineral oil is further added to the mixer and mixed, and the binder coating on the surface of the aggregate is coated with mineral oil to form a mineral oil layer around the binder coating.

In this example, the composition of the binder and the mixture as a mixture are as follows.

Binder composition Liquid asphalt 60-80 parts Rubber 10-30 parts Thermoplastic resin (petroleum resin) 10-30 parts Compound of road crushed stone (JIS A5001) 70-95 parts Sand 0-20 parts Filler 5-10 parts Binder: 3 to 6 parts Mineral oil: 0.3 to 1 part Here, the rubber and mineral oil contained in the binder are combined with a difference in polarity. Specifically, rubbers with high polarity such as SBR, nitrile rubber, and chloroprene have high polarity, so paraffin base oil with low polarity, such as paraffin base oil, is used, and ethylene propylene rubber, isobutylene isoprene rubber, natural rubber, etc. have low polarity. Therefore, for example, an aroma base oil with a high polarity value is used.

The drawing shows an example of a paving composite material manufactured according to the present invention, in which a filler 2 is placed around the aggregate 1.
This shows a paving composite material coated with a binder 3 containing mineral oil and a mineral oil layer 4 formed around it.

(Effects of the Invention) Since the present invention is made as described above, that is, in the paving composite material produced by this manufacturing method, a binder coating is formed around the aggregate, and this coating is formed around this coating. Since it is provided with a mineral oil layer having a polarity different from that of the rubber contained in the binder, it has the following advantages.

If there is a difference in the polarity value of the rubber contained in the binder and the polarity value of the mineral oil, the compatibility between the binder and the mineral oil layer will be low, and the mineral oil will form a surface film around the binder coating. Each layer is slippery and easy to work with.

When the mineral oil layer provided around the binder coating is used for paving, it is forcibly rubbed and destroyed by rolling pressure, and is forcibly incorporated into the binder, so it can be used at room temperature.

Since the binder contains thermoplastic resin and rubber, it has good stability as a paving material.

Since no solvent is used, storage stability is good.

Overall, it has the excellent properties of heated asphalt mix and the convenience of room-temperature pavement mix.

[Brief explanation of drawings]

The drawing is an explanatory diagram showing an example of a paving composite material manufactured by the manufacturing method of the present invention, in which 1 is aggregate, 2 is filler, 3 is binder coating, and 4 is mineral oil.

Claims (1)

[Claims] 1. After kneading aggregate and a binder that is a mixture of liquid asphalt with rubber and thermoplastic resin, and coating the aggregate with the binder, mineral oil with a polarity different from that of the rubber contained in the binder is mixed. 1. A method for producing a paving composite material, characterized in that a layer of mineral oil is provided around a binder coating.