JPH0640582Y2 - Granulated elastic type bituminous material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a granulated elastic type bituminous material. More specifically, it has a tensile amount of 3 mm or more at low temperature (-10 ° C), which is a relatively large amount of bituminous material mixed with rubber, high molecular weight polymer, etc. The present invention relates to a granulated elastic type bituminous material suitable for use as a binding material for wear-resistant pavement, crack repair, elastic pavement, etc. in cold regions.

A typical example of elastic type bituminous material that has a tensile amount of 3 mm or more at low temperature (-10 ° C) is heat-injection type joint material. Heat-injection type joints are used for joints in cement concrete and asphalt pavements, and for sealing and repairing cracks. And, the heat-injection type joint material has excellent bonding property and watertightness, there is no flow and flush in summer, it does not become brittle at low temperature in winter, and it has excellent bonding property, elongation and watertightness. Is requested. Therefore, the heat-injection type joint material is made by mixing a bituminous material with a relatively large amount of rubber, a polymer, and the like. The biggest problem with the heat-injection type jointing material is that the shape of the product is relatively large (30 x 30 x 5 cm), so it is difficult to melt when heated and melted, and it is difficult to handle. That is, since it takes too much time to heat and melt in this state, the plate-shaped solid matter is divided into appropriate sizes and then heat-melted in the field. Since it does not break even if shocked at room temperature, it has been devised to cut it in various ways, but it is difficult to cut because it is sticky, and it is difficult to handle even if it is cut. Even if cut into a suitable size, it takes a long time to melt because it is not a small piece, and the heating time becomes long. Along with this, heat deterioration, decomposition, etc. of the mixed rubber, high molecular weight polymer, etc. occur, which may result in deterioration of quality. Further, there is a problem that the heating and melting work is too labor intensive.

In addition, recently, a heating mixture using a heat-conducting pouring joint material or a material having the same properties as that of a binder, abrasion-resistant pavement in cold regions, abrasion-resistant pavement, crack-resistant thin layer pavement,
It is used or is about to be used for special pavement and special maintenance and repair of pavement such as level difference correction, various crack repairs, pavement of stepless joints on bridge surface, etc. In this case, too, there are problems that the heating, melting takes too much time, labor and cost, and that the quality may deteriorate during heating and melting.

The present invention solves such a problem, and an elastic material having a tensile amount of 3 mm or more at a low temperature (−10 ° C.) prepared by mixing a relatively large amount of rubber and a high molecular weight polymer with a bituminous material. Type bituminous material is formed into granules, and its surface is coated with a non-adhesive to make it easier to handle, shorten the heating and melting time, and reduce the time, labor, and cost during heating and melting. It is intended to provide a granular elastic type bituminous material which can save a great amount and prevent quality deterioration.

And this invention has a tensile amount of 3mm at low temperature (-10 ℃).
The above is a granulated elastic bituminous material characterized in that the elastic type bituminous material is formed into granules, and the surface thereof is covered with powder particles of an inorganic substance, an organic substance or the like, or a non-adhesive substance such as a filler. It is a thing.

The elastic type bituminous material referred to in the present invention is as follows.

It is a mixture of bituminous material with a relatively large amount of rubber, high molecular weight polymer, etc., and has thermoplasticity. For example, the heat-injection type joint material described in the cement concrete pavement guide issued by the Japan Road Association. The flow of the test items stipulated in the quality standard (flow test at 60 ° C) is 5 mm or less, and the tensile amount (tensile test at -10 ° C) is 3 mm or more.

Therefore, the elastic-type bituminous material includes both the low-elasticity type and the high-elasticity type which are specified in the quality standard of the heat-injection type joint material for the cement concrete pavement described above. Moreover, even if there are some items that fall under the test items of this quality standard, those that meet the above requirements for flow and tensile amount are included. Also, those having intermediate properties between the low elasticity type and the high elasticity type are included. In addition, there is a federal standard SS-S-1401B "heat-injection type sealing material for concrete pavement and asphalt pavement" in the standard of injection joint material, but those which pass this are also included. Furthermore,
Even commercialized products other than injection joint materials include bituminous materials in which a relatively large amount of rubber, high molecular weight polymer, etc. are mixed and which satisfy the requirements of thermoplasticity, the above flow and tensile amount. . The bituminous material referred to here is asphalt, tar, etc., but asphalt is generally used. The rubber includes natural rubber, synthetic rubber, rubber powder (including vulcanized, unvulcanized, and partially vulcanized), regenerated rubber, rubber-like block copolymer, liquid rubber and the like. When the bituminous material is asphalt, for example, polyethylene, ethylene vinyl acetate copolymer, ethylene olefin copolymer, ethylene acrylate copolymer, polyacrylate, acrylate copolymer, styrene Examples include butadiene-block copolymers and styrene-isoprene block copolymers.

Next, an embodiment of the present invention will be described with reference to the drawings. First
FIG. 2, FIG. 3 and FIG. 3 are sectional views showing an embodiment of the granular type elastic bituminous material of the present invention. First
The figure shows a crushed stone in the grain shape, FIG. 2 shows a columnar particle diameter, and FIG. 3 shows a spherical particle diameter.

In the figure, (1) is one particle of the granulated elastic type bituminous material of the present invention. (2) is an elastic type bituminous material particle, (3) is a non-adhesive substance such as an inorganic or organic powder particle, a filler, etc. There is.

Granulation of the elastic type bituminous material may employ a suitable method such as crushing or granulation.

Although various methods are adopted as the crushing method, for example, the freeze crushing method is effective. The freeze crushing method is
This is a method in which a plate-shaped molded product of an elastic type bituminous material is cooled and crushed in a freezer. At that time, it is desirable that the temperature of the freezer is at least -20 ° C or lower. Temperature is about -35 ° C
When it is below, crushing becomes extremely easy. Alternatively, it may be crushed by cooling with liquid nitrogen or the like. The crushing can be performed through an appropriate crusher or the like. The frozen crushed product has a shape similar to coarse-grained rubber powder or crushed stone, and various shapes can be mixed together.

Although various methods are adopted as the granulation method, for example, a method of extruding an elastic type bituminous material into a rod shape by an extruder and cutting the extruded material into short pieces. An elastic type bituminous material that has been heated and melted is dropped into water, and further rotated to granulate.

The material granulated by crushing, granulation, etc. is coated with powder particles of inorganic or organic material, non-adhesive material such as filler, but may be coated during the granulation step.

The shape of the elastic type bituminous material particles (2) may be various shapes without requiring a specific shape. However, the size is preferably small. In order to facilitate handling and facilitate heating and melting, for example, in the case of crushed stone particles, it is preferable that the size of crushed stone No. 6 (particle diameter 13 mm to 5 mm) is smaller than this. The same applies to other shapes.

Non-adhesive substances (hereinafter, simply referred to as non-adhesive substances) (3) such as inorganic or organic powder particles and fillers are as follows.

For example, stone powder, slaked lime, cement, fly ash, clay, diatomaceous earth, talc, glass powder, silica powder, crushed stone dust, mica powder, incinerated ash, coal powder, asbestos powder, wood powder, rubber powder, synthetic resin powder, Examples include plastic powder, ceramic powder, and short fibers.

The non-adhesive material (3) is adhered to the surface of the elastic type bituminous material particles (2) in order to prevent the aggregation of the elastic type bituminous material particles (2) due to the adhesion of each other. Since the elastic type bituminous material has adhesiveness, it can be coated by utilizing the adhesiveness of the surface of the elastic type bituminous material particles (2), but it can also be coated with water or synthetic resin,
It can be coated by using an emulsion such as rubber, latex, or an aqueous solution of a water-soluble polymer substance. When using water, it is advisable to use a surfactant, a dispersant and the like together. When using water, it is advisable to disperse part of the non-sticky material.

To give a few examples, the freeze-crushed elastic type bituminous material particles (2) can be easily coated by spray-mixing the non-adhesive material (3). In addition, the bituminous material melted by heating can be coated in parallel with granulation by dropping the non-adhesive (3) into the dispersed water. Similarly, in the case of extrusion, coating can be performed concurrently with granulation.

Since the surface of the granulated elastic type bituminous material of the present invention is coated with a non-adhesive material, the particles do not adhere to each other at room temperature, and thus they are easy to handle and can be packed in bags, boxes, cans, drums. It can be packed in various ways such as stuffing.

When it is melted in a heating and melting pot, it can be used as it is because it has a small grain shape, and it does not require the labor and time required to cut it into small pieces unlike conventional injection joint fillers. Further, since the heating and melting time can be remarkably shortened, deterioration of quality due to heating can be prevented. Further, since the non-adhesive substance on the surface is in a small amount, it has a practical advantage that it does not adversely affect the physical properties and workability even if it is mixed in the heat-melted elastic type bituminous material.

[Brief description of drawings]

1, 2 and 3 are sectional views showing an outline of an embodiment of the granular type elastic bituminous material of the present invention. FIG. 1 shows particles having a shape similar to crushed stone, FIG. 2 is a sectional view of particles having a cylindrical shape, and FIG. 3 is a sectional view of particles having a spherical shape. In the figure, (1) is a granular elastic type bituminous material of the present invention, (2) is an elastic type bituminous material particle, and (3) is a non-adhesive.

Claims (1)

[Scope of utility model registration request] 1. An elastic type bituminous material having a tensile amount of 3 mm or more at a low temperature (-10 ° C.) is formed into a granular form, and the surface thereof is coated with a non-adhesive substance such as an inorganic or organic powdery grain or a filler. A granular elastic type bituminous material characterized by the following.