JPS5944442B2 - Manufacturing method for new asphalt mixture - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for producing a new asphalt mixture.

In recent years, the uses of asphalt mixture have become diverse.

Various uses have been proposed, including not only road paving (but also for general household use).

In view of these circumstances, an object of the present invention is to provide a method for producing a new asphalt mixture that can be relatively easily used for various purposes.

In the method for producing asphalt mixture according to the present invention,
First, a conventional asphalt mix is created by mixing new asphalt with new aggregates of various sizes, and then brought to a predetermined temperature.

The asphalt mixture thus heated is separated by applying physical force in the presence of water.

For example, water is heated to a predetermined temperature, hot asphalt mixture is added to it, and then the asphalt mixture is separated using physical force.

It is also possible to separate the asphalt mixture by applying physical force while spraying water on the hot asphalt mixture.

Other methods can also be adopted. As a means for applying physical force, any conventionally commonly used means may be used, so no particular explanation will be given.

Now, when the conventional asphalt mixture is heated and separated at high temperature in the presence of water as described above, the new asphalt mixture according to the present invention is made of a large number of aggregates with an asphalt coating on the entire surface. It will be done.

These aggregates usually do not adhere to each other and are independent and loose.

Although these new asphalt mixes can be used for a variety of purposes even if they contain a mixture of different particle sizes, the range of applications can be further expanded by sorting the aggregate into several pieces of roughly the same size.

For example, it is possible to use a sieve to sort into four types of particle sizes and use each particle size separately, or to use a mixture of the four types at an appropriate blending ratio.

In short, the asphalt mixture made by the method of the present invention can be mixed freely in various ways depending on the purpose, so there is a lot of room for choice.

A major feature of the present invention is that a new asphalt mixture is used as a raw material.

There is a significant technical difference between using a new asphalt mixture as a raw material and using waste asphalt mixture as a raw material.

When performing asphalt pavement with high precision, it is necessary to accurately grasp the composition content, and it has recently become a practical requirement to examine the content of the composition very severely. Asphalt mixture and waste asphalt mixture cannot be equated.

Since it is usually not possible to identify the site from which waste asphalt mixture was collected, it is often unclear what its specific composition is.

Of course, the approximate composition is known, but the exact composition cannot be determined.

If the waste asphalt mixture that should be treated on-site is analyzed in detail, the manufacturing cost will increase significantly, making it no longer a realistic treatment method.

In addition, the volatile content of waste asphalt mixture evaporates during use as pavement, and the original composition often changes. However, volatile components evaporate, making it difficult to determine the exact composition.

Therefore, in the case of recycled products from waste asphalt mixture, additives are always required, but the problem is the amount to be added.

Analyzing the amount added is extremely difficult and requires advanced technical judgment, but on the other hand, when new asphalt mix is used as a raw material, problems such as those seen in waste asphalt mix as mentioned above can be avoided. will all be resolved.

In other words, a desired asphalt mixture can be manufactured under strict compositional control.

This makes it possible to eliminate the need for additives.

In addition, such asphalt mixtures have an asphalt coating on the surface of each aggregate, and each aggregate is separated from each other. There is no need for a surge bin to keep warm.

Therefore, the asphalt mixture according to the present invention has the great advantage that it can be intensively treated in large quantities in one plant, left as it is for a considerable period of time after treatment, and used as needed.

For example, a large amount of asphalt mixture is manufactured at one large plant IC, and then it is left in the natural environment for a considerable period of time, and then transported to multiple sites as needed and installed at each site. It is possible.

In short, the degree of freedom when using asphalt mixture material is greatly increased.

In this specification, asphalt is merely used as a representative example of a bituminous material for convenience.

Furthermore, water refers not only to water at low temperatures, but also water at any temperature, including high temperatures.

A more specific example will be explained.

First, conventionally known continuous asphalt mixing plants (for example, "Asphalt Pavement Guidelines" edited by the Japan Road Association)
1975 edition)” Sold by Maruzen Co., Ltd. (November 1975)
(published on May 25th) (see pages 76 onwards), a conventional asphalt mixture was made and heated to approximately 90°C.

Sufficient water at about 90° C. was added to the asphalt mixture at that temperature.

Then, in the presence of sufficient water, the asphalt mixture was separated using a screw crusher.

As a result, a thin asphalt film was formed on the surface of the aggregate.

After that, when the aggregates were left to dry naturally, they did not adhere to each other at room temperature (they became disjointed) despite having an asphalt coating on the surface.

When this new asphalt mixture was heated again to a target temperature of 160°C and used for paving, it was found to have sufficient strength.

Claims (1)

[Claims] 1 New asphalt and various new aggregates are mixed and heated to create a conventional high-temperature asphalt mix, and the asphalt mix is separated from each other by applying physical force at high temperatures and in the presence of water. At the same time, a method for producing a new asphalt mixture characterized by providing an asphalt coating on the entire surface of each aggregate.