JP3044611B2 - Construction method and material of upper subbase with mixed incineration ash - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road construction method and a road material, and more particularly to a method of treating general incinerated ash by mixing general incinerated ash, preventing elution of harmful components, and asphalt. The present invention relates to an upper roadbed construction method and an upper roadbed material capable of effectively utilizing waste materials and the like.

[0002]

2. Description of the Related Art Conventionally, incineration ash produced by incineration of general waste has been treated by burying it in landfills. However, incineration ash of certain types of industrial waste and general household waste that has not been sufficiently separated have been used. Harmful components such as dioxin are eluted in the incineration ash of the products, and may cause pollution, which has become a social problem in recent years. Therefore, means for preventing leakage of harmful components and the like by disposing a water-impermeable sheet below ground in a landfill has been proposed.

[0003]

However, some people question whether or not the means for arranging the water-impermeable sheet underground can completely prevent the leakage of harmful components. Due to the opposition of local residents, the government and municipalities have not been able to reclaim landfills and have found no other effective disposal method of the above incinerated ash, and are in a clogged state. It is a big social issue that we can't afford to keep. It has also been proposed to solidify the incinerated ash with cement or pack it in a container.However, in order to stack these materials, a large site is required, and because of the corrosion or damage of the container, or Harmful components may leak from the cement, which is difficult to achieve. The present invention has been made in view of such circumstances, and an object of the present invention is to treat (dispose) incinerated ash, prevent leakage of harmful components, and effectively utilize asphalt waste material, which is industrial waste. It is an object of the present invention to provide an upper subbase construction method and an upper subbase material capable of measuring the following. The use of asphalt waste for the upper roadbed has already been proposed by the present inventors. JP-A-8-226101
This is the method of construction of the upper roadbed and the material of the upper roadbed.

[0004]

Means for Solving the Problems The present invention has been made to achieve the above object, and the present invention has the following constitution. A Granulated material having a particle size of about 5 mm or less, which is obtained by mixing at least incineration ash of general waste, asphalt emulsion, and appropriate water, drying and crushing, crushed asphalt waste material having a particle size of 40 mm or less, and general recycled crushed stone And, cement, and water that does not scatter the cement, after mixing by a central plant method using a mixing plant fixed in place, transport the mixture to the construction site, and to construct Construction method of upper subgrade using mixed incineration ash. B In the method for constructing an upper roadbed according to the above A, the weight ratio of the granular material, the crushed asphalt waste material, and the general recycled crushed stone to the total amount of the granular material is 5 to 30%, and the asphalt waste material is 30 to 7 crushed pieces
A method of constructing an upper roadbed using a mixture of incinerated ash having a weight ratio of 0% to 20% to 40% for the general recycled crushed stone and 5 to 50% by weight of the asphalt emulsion to the total amount of the incinerated ash and the asphalt emulsion. C Granulated material having a particle size of about 5 mm or less, which is obtained by mixing at least incineration ash of general waste, asphalt emulsion and appropriate water, drying and crushing, crushed asphalt waste material having a particle size of 40 mm or less, and general recycled crushed stone And an upper roadbed material obtained by mixing at least a cement and water to such an extent that the cement is not scattered, and mixing them by a central plant method using a mixing plant fixed at a predetermined place. D In the upper roadbed material according to C, the weight ratio of the granular material, the crushed asphalt waste material, and the general recycled crushed stone to the total amount of 5 to 3 is as follows.
0%, the crushed material of the asphalt waste material is 30 to 70%,
An upper roadbed material in which the general recycled crushed stone is 20 to 40% and the asphalt emulsion has a weight ratio of 5 to 50% with respect to the total amount of incinerated ash and asphalt emulsion. E In the method for constructing an upper subgrade described in the above item A or B, in addition to incinerated ash, asphalt emulsion and water, a small amount of cement and / or lime is added to the granular material and mixed. Construction method of upper subgrade using incineration ash. F. The upper roadbed material according to the above item C or D, wherein the granular material is mixed with a small amount of cement and / or lime in addition to incineration ash, asphalt emulsion and water during the production thereof. material. Here, "crushed asphalt waste material" is referred to as asphalt recycled aggregate, and "crushed asphalt waste material having a particle size of 40 mm or less" is a size of about 40 mm square that falls from a sieve. It means asphalt recycled aggregate. The “general reclaimed crushed stone” is a crushed material of a roadbed, and is called a roadbed regenerated aggregate.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an asphalt emulsion is added to the incineration ash of general waste, an appropriate amount of water is further added and mixed well, and the mixture is dried to such an extent that it can be crushed. After crushing by 5mm
A granular material is produced by sieving with a coarse sieve. That is, the material that has passed through the sieve and dropped down is the granular material. It is desirable to remove incineration ash in advance when large incineration residues are mixed. Also, as incineration ash, incineration ash from household waste, incineration ash from industrial waste, or a mixture thereof, or incineration ash after removing substances that may leak harmful components from waste, etc. It is possible, but it is desirable that harmful components be within the range permitted by waste disposal laws. The more asphalt emulsion, the better to prevent the elution of harmful components, the better,
If the weight ratio of the asphalt emulsion to the total amount of the incineration ash and the asphalt emulsion is more than 50%, the asphalt emulsion becomes a dumpling and is hard to be crushed and granulated, so that it is not more than 50%. The amount of water to be added to the incineration ash and asphalt emulsion during the production of the granular material is determined by taking into account this fact, because if it is increased, it is easy to mix, but the drying time becomes longer.
In addition, when manufacturing the granular material, a small amount (1 to 5%) of lime, cement, or the like may be added to the above material as needed. The time required for drying the mixed material varies depending on the amount of asphalt emulsion, the amount of water added, and the total amount of the mixture, but is about several days for natural drying. Means such as ventilation drying are also conceivable. The granular material produced in this way can be stored, so that it can be conveniently stored until the result of the dissolution test of harmful components is known. Said granular material;
Crushed asphalt waste material with a particle size of 40 mm or less (recycled asphalt aggregate) and general recycled crushed stone (recycled roadbed aggregate)
And the cement and water that does not scatter the cement,
When mixed by the central plant method, it becomes the upper subbase material of the present invention, and when the mixture is transported to the construction site and executed, the upper subbase construction method of the present invention is achieved. The mixing ratio of each material is
The weight ratio to the total amount of the granular material, the crushed asphalt waste material and the general recycled crushed stone ranges from 5 to 30% for the granular material, 30 to 70% for the crushed asphalt waste material, and 20 to 40% for the general recycled crushed stone. However, it is desirable that the value be determined so as to satisfy the standard value of the Asphalt Pavement Outline of the Japan Road Association and to enable economical production. Note that the central plant method is a method that uses a mixing plant fixed at a predetermined place and is a method corresponding to an on-road mixing method of mixing at a construction site.

[0006]

【Example】

[Example 1] The incineration ash 10 of general waste, the asphalt emulsion 5 and the water 5 were mixed well in a weight ratio, then dried naturally for 3 days, crushed, sieved, and sieved to a size of about 5 mm. The passed granular material, asphalt recycled aggregate, and roadbed recycled aggregate were mixed by a central plant system, and the recycled cement bitumen stabilization treatment was performed according to the Japan Road Association's Road Recycling Roadbed Construction Technical Guideline (draft). That is, the weight ratio of each material to the total weight of the granular material, the asphalt recycled aggregate, and the roadbed recycled aggregate is 5 or 10% for the granular material, 70% for the asphalt recycled aggregate, and 20 or 25 for the recycled roadbed aggregate. Table 1 shows the test results in the case of%. Table 1 also shows the results of a tamping test for determining the optimum water content and the optimum amount of additive.

[Table 1] (Note 1) Here, the fact that the amount of asphalt emulsion is 0% means that the amount of asphalt emulsion further added to the granular material, asphalt regenerated aggregate and general reclaimed crushed stone is 0%. As can be seen from Table 1, the uniaxial compressive strength and the residual strength ratio satisfy the standard values of the stabilized cement bitumen stabilization treatment in both cases of 5% and 10% of the granular material, and have flexibility and rigidity. It can be used as an upper roadbed. The amount of cement added is also about 2%, and an economical production of a regenerated cement bitumen stabilizing mixture is possible. The harmful components and the like contained in the incineration ash are preliminarily covered with the asphalt emulsion and are therefore hardly eluted, so that it is considered that the stabilized cement bitumen mixture has little effect on the environment. Before using granular materials in the upper subgrade, it is necessary to perform a dissolution test for harmful components to confirm that the tolerance satisfies the allowable value prescribed by the law on waste disposal. It is convenient because it can be stored as it is. Tables 2 and 3 show the sieving test (JISA110) of incinerated ash and asphalt recycled aggregate, respectively.
The result of 2) is shown. FIG. 1 shows a particle size curve diagram of the granular material.

[Table 2]

[Table 3]

Example 2 The incineration ash 10 of general waste, the asphalt emulsion 1 and the water 9 were mixed well in a weight ratio, then dried naturally for 3 days, crushed and sieved.
The granular material that has passed through a sieve of about 5 mm, asphalt recycled aggregate, and roadbed recycled aggregate are mixed by the central plant method, and the recycled cement bitumen stabilization treatment is performed according to the Japan Road Association's Road Recycling Roadbed Construction Technical Guideline (draft). Was done. That is, the weight ratio of each material to the total weight of the granular material, the asphalt recycled aggregate, and the roadbed recycled aggregate is 5% for the granular material.
Table 4 shows the test results when the asphalt recycled aggregate was 70% and the roadbed recycled aggregate was 20 or 25%.
Shown in Table 4 also shows the results of a tamping test for determining the optimum water content and the optimum amount of additive.

[Table 4] (Note 2) Here, the fact that the amount of asphalt emulsion is 0% means that the amount of asphalt emulsion further added to the granular material, asphalt regenerated aggregate and general reclaimed crushed stone is 0%. In Example 2, as compared with Example 1, the amount of asphalt emulsion added to the incineration ash was reduced to one fifth, and the amount of water was increased by the reduced amount so that the total amount of each material was not changed. As can be seen from Table 4, the unconfined compressive strength and residual strength ratio satisfy the standard values of the stabilized cement bitumen stabilization treatment in both cases of 5% and 10% of the granular material. It has rigidity and can be used as an upper roadbed. As in the case of Example 1, the amount of cement added is also about 2%, and an economical production of a recycled cement bitumen stabilizing mixture is possible. As in the case of Example 1, the harmful components and the like contained in the incineration ash are coated on the asphalt emulsion and are hardly eluted. Therefore, it is considered that the stabilized cement bitumen mixture has little effect on the environment. The granular material is convenient because it can be stored as it is until the dissolution test.
The asphalt emulsion used in the production of the granular material is smaller than that in Example 1, but it is necessary to slightly increase the optimum amount of added cement. Table 5 shows the results of the incineration ash sieving test (JISA1102). FIG. 2 shows a particle size curve diagram of the granular material.

[Table 5]

Example 3 The weight ratio of the asphalt emulsion to the total amount of the incinerated ash and the asphalt emulsion as the granular material is 5 to 50%, and the total amount of the granular material, the asphalt recycled aggregate and the roadbed recycled aggregate The weight ratio is as follows: 30% of granular material, 30% of asphalt recycled aggregate, and 40% of recycled roadbed aggregate, and furthermore, 1.5 to 6% by weight of recycled cement based on the total amount of these materials. The cement bitumen-stabilized mixture also satisfies the standard values for both the unconfined compressive strength and residual strength, and can be used as an upper subgrade. However, the larger the amount of asphalt emulsion added during the production of the granular material, the more preferable it is for preventing elution of harmful components.
%, The incinerated ash solidifies in a dumpling shape, making it difficult to crush (crush).

The incinerated ash used in the present invention preferably has a harmful component within a range permitted by laws relating to waste disposal. In each of the above embodiments, about 1 to 5% of lime or cement may be mixed with the granular material in addition to incineration ash and asphalt emulsion during production. Although some embodiments of the present invention have been described above, the present invention is not limited to such embodiments at all, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention. It is.

[0010]

Since the present invention is configured as described above, the following effects can be obtained. According to the method of constructing the upper roadbed and the upper roadbed material according to claims 1 to 6,
A large amount of incineration ash, which had previously been difficult to dispose of, can be disposed of in large quantities, and since the incineration ash is covered with asphalt emulsion, elution of harmful components can be prevented, and asphalt waste material, which is industrial waste, can be effectively used. Can be achieved. Further, the granular material obtained by solidifying the incinerated ash with an asphalt emulsion or the like can be stored in that state, so that it can be conveniently stored until a result of a harmful component elution test is obtained or transported to a central plant. Claims 5 and 6
According to the upper roadbed construction method and upper roadbed material described, lime and cement are mixed at the time of the production of granular material, so when the proportion of incinerated ash in the upper roadbed is large,
The tendency of the uniaxial compressive strength to decrease can be improved.

[Brief description of the drawings]

FIG. 1 is a particle size curve diagram of incinerated ash used in Examples of the present invention.

FIG. 2 is a particle size curve diagram of incineration ash used in another embodiment of the present invention.

Claims (6)

(57) [Claims] An incinerated ash of general waste, an asphalt emulsion, and at least an appropriate water are mixed, dried and crushed to obtain a granular material having a particle diameter of about 5 mm or less, and a crushed asphalt waste material having a particle diameter of 40 mm or less. , General recycled crushed stone, cement, and water to the extent that the cement does not scatter, after mixing in a central plant method using a mixing plant fixed in place, transport the mixture to the construction site, Construction method of upper subgrade using mixed incineration ash. 2. The method according to claim 1, wherein the weight ratio of the granular material to the total amount of the crushed asphalt waste material and the general recycled crushed stone is 5 to 30%. The incineration wherein the asphalt waste material crushed material is 30 to 70%, the general recycled crushed stone is 20 to 40%, and the asphalt emulsion has a weight ratio of 5 to 50% to the total amount of incinerated ash and asphalt emulsion. Construction method of upper subgrade using ash. 3. A granular material having a particle size of about 5 mm or less, which is obtained by mixing at least incineration ash of general waste, asphalt emulsion, and appropriate water, drying and crushing the same, and a crushed asphalt waste material having a particle size of 40 mm or less. An upper roadbed material comprising at least a general recycled crushed stone, cement, and water to such an extent that the cement is not scattered, and mixing them by a central plant method using a mixing plant fixed at a predetermined place. 4. The upper subbase material according to claim 3, wherein
The weight ratio of the granular material, the crushed asphalt waste material, and the general recycled crushed stone to the total amount is 5 to 30% for the granular material, and 30 for the crushed asphalt waste material.
An upper roadbed material in which the weight ratio of the asphalt emulsion to the total amount of the incinerated ash and the asphalt emulsion is 5 to 50%, and the general recycled crushed stone is 20 to 40%. 5. The method according to claim 1, wherein a small amount of cement and / or lime is added to the granular material in addition to incinerated ash, asphalt emulsion and water during the production. Construction method of upper subgrade using mixed incineration ash. 6. The upper roadbed material according to claim 3, wherein said granular material is mixed with a small amount of cement and / or lime in addition to incineration ash, asphalt emulsion and water during its production. Upper subbase material.