JP2000257007A - Stabilized subgrade and pavement structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stabilized subgrade and pavement structure having a water holding property, effective in maintaining water environment, excellent in durability, and also effective in suppressing and effectively using industrial waste. SOLUTION: A stabilized subgrade 2 comprises mainly a subgrade soil, solidification agent, and completely burned bottom ash. Its composition is 3 to 30% in solidification agent by weight and 5 to 15% in completely bottom ash by weight relative to the subgrade soil. Also, it comprises a premixture in which the solidification agent is mixed with the completely burned bottom ash beforehand, and the mixing ratio of the solidification agent to the completely burned ash is 5:5 to 8:2. Thus, a pavement structure 1 contains the completely burned bottom ash in a permeable subgrade 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stabilized subgrade using completely incinerated ash, and more particularly to a pavement structure containing completely incinerated ash in a permeable roadbed, which is excellent in durability and water permeability. The present invention relates to a stabilized subgrade that has good performance, suppresses a heat phenomenon on a road surface, suppresses generation of industrial waste, and is effectively used.

[0002]

2. Description of the Related Art Conventionally, as a pavement structure, a pavement structure as shown in FIG. 2 is generally used in consideration of water environment conservation, traffic noise reduction, roadside environment and the like. This pavement structure has a multi-layered structure having a permeable base 3 made of recycled concrete crushed stones, a base layer 7 and a surface layer 6 on which a subgrade soil or an improved soil obtained by mixing a solidifying material or the like is laid on a subgrade 2 and then on the subgrade. Has become. This pavement structure, during rainfall,
The structure penetrates the surface layer 6 but is blocked by the base layer 7 and flows to the side.

[0003]

However, the pavement structure as described above is made of an improved soil in which the subgrade 2 or the base layer 7 is made of soil or an asphalt mixture having no water permeability, or soft soil is improved with a solidifying material or the like. Therefore, the water permeability was poor. Also, in summer, the surface layer 1 is heated, and asphalt softening occurs, so that there is a problem that a stable pavement structure cannot be obtained for a long period of time.

[0004] Therefore, the present invention and the like have a water-retaining property on the roadbed, are effective in preserving the water environment, suppress the heat phenomenon on the road surface, have excellent durability, and further suppress and effectively utilize industrial waste. In order to obtain a subgrade or pavement structure that is effective for
After various examinations, it has water retention by mixing completely incinerated ash into the subgrade 2 and furthermore, mixing completely incinerated ash into the permeable roadbed 3, and is effective in preserving the water environment. A subgrade roadbed that is excellent in performance and is also effective in suppressing and effectively utilizing industrial waste is obtained, and is also effective in preserving the water environment, heat phenomena on the road surface are suppressed, and durability is excellent. It has been found that a pavement structure that is effective in suppressing industrial waste and effectively utilizing it can be obtained.

Accordingly, a first object of the present invention is to have a water retention property, to be effective in preserving the water environment, to be excellent in durability, and to suppress and effectively utilize industrial waste. It is to provide an effective stabilized subgrade. The second problem to be solved by the present invention is effective in preserving the water environment, suppressing the heat phenomenon on the road surface,
It is an object of the present invention to provide a pavement structure which is excellent in durability and is effective for suppressing industrial waste and effective use thereof.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
The invention is achieved by the following inventions.

(1) A stabilized subgrade characterized by containing subgrade soil, solidified material and completely incinerated ash as main components. (2) The stabilized subgrade according to the above item 1, wherein the solidified material is 3 to 30% by weight and the completely incinerated ash is 5 to 15% by weight based on the subgrade soil. (3) The stabilized subgrade according to the above (1) or (2), comprising a premix in which the solidified material and the completely incinerated ash are previously mixed. (4) The stabilized subgrade as described in any one of (1) to (3) above, wherein the mixing ratio of the solidified material and the completely incinerated ash is 5: 5 to 8: 2. (5) The pavement structure according to any one of claims 1 to 4, wherein the permeable roadbed contains completely incinerated ash.

[0008] The stabilized subgrade according to the present invention is characterized by comprising subgrade soil, a solidified material and completely incinerated ash as main components, and by incorporating completely incinerated ash, water retention is obtained. In addition, it is effective in preserving the water environment, is excellent in durability, and is effective in suppressing industrial waste and effectively utilizing it. In the present invention, it is preferable that the solidification material is 3 to 30% by weight and the completely incinerated ash is 5 to 15% by weight with respect to the subgrade soil, since the above-mentioned effect is maximized.

In the present invention, by using a premix in which the solidified material and the completely incinerated ash are mixed in advance, scattering of the completely incinerated ash during construction is suppressed, and the workability is simple and easy. Mixing ratio of solidified material and complete incineration ash is 5: 5 to 8:
The effect is maximized by being 2. Furthermore, in the present invention, by including completely incinerated ash in the permeable roadbed, it is effective in preserving the water environment, the heat phenomenon on the road surface is suppressed, the durability is excellent, and furthermore, industrial waste is suppressed and effectively used. Thus, a pavement structure that is effective for the vehicle can be obtained.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments.

The stabilized subgrade according to the present invention is mainly characterized by subgrade soil, solidified material and completely incinerated ash.
As the subgrade soil, any of clay soil and high water content soil can be used. The solidifying material used in the present invention is not particularly limited, and examples thereof include cement, cement-based solidifying material (Eustabilizer, trade name, manufactured by Ube Mitsubishi Cement Co., Ltd.), slaked lime, quick lime, and the like. Eustavirers are preferred.

The completely incinerated ash used in the present invention is F
J-Light (trade name, complete incineration ash of papermaking sludge, manufactured by Shinryo Seisakusho Co., Ltd.) is preferable. FJ Wright uses 850 incineration ash, which is industrial waste papermaking sludge, for 30 to 40 minutes.
It is a completely incinerated ash that has been reburned in a high-temperature atmosphere of up to 900 ° C. and is in a fine powder state having a whiteness of 55 to 65%, which has lost unburned carbon, that is, a completely inorganic ceramic. FJ Light is
No harmful substances are detected in the dissolution test, and they do not react with acids or alkalis, and are extremely chemically stable. FJ light is porous and lightweight, has excellent water absorption, and has a high water retention. Furthermore, it has the property that it is hard to be muddy even if it absorbs and retains water.

The completely incinerated ash used in the present invention can be used for a part of a pavement structure.
As shown in the partial perspective view of FIG. 1, an improved soil in which a solidified material or the like is mixed with the bottom soil or the soil is laid on the subgrade, and a water-permeable roadbed 3 made of recycled concrete crushed stone or the like is successively placed thereon, It has a permeable layer 4 made of an asphalt mixture, a cushion layer 5 on which crushed stone is laid, and a surface layer 6, and is used for this subgrade. In this subgrade, the solidified material and the completely incinerated ash are mixed into the soil to form the stabilized subgrade 2. As a result, a roadbed having excellent water permeability and water retention and excellent durability is formed. Further, in the present invention, completely incinerated ash can be mixed into the water permeable roadbed 3 and used, whereby a roadbed excellent in water permeability can be obtained. Combining such a water-permeable roadbed 3 and the stabilized roadbed 2 is effective in preserving the water environment, suppressing the heat phenomenon on the road surface, and obtaining the pavement structure 1 having excellent durability.

In the stabilized subgrade 2 of the present invention, it is preferable to mix 3 to 30% by weight of solidified material and 5 to 15% by weight of completely incinerated ash to the subgrade soil. When the amount is less than 3% by weight, there is no soil improvement effect, and when the amount of the solidified material exceeds 30% by weight, it is economically disadvantageous. If the total incineration ash is less than 5% by weight of the subgrade soil, the strength is weak and not practical, and if it exceeds 15% by weight, uneven mixing and unevenness in the strength will occur, resulting in poor construction efficiency. No further increase in strength does not increase.

In the present invention, it is possible to use a premix in which the solidified material and the completely incinerated ash are mixed in advance, and the mixing ratio of the solidified material and the completely incinerated ash is 5: 5 to 8: 2. . When the mixing ratio between the solidified material and the completely incinerated ash is other than 5: 5 to 8: 2, the strength decreases particularly when the amount of the completely incinerated ash increases.
The premix is preferably in the range of 3 to 30% by weight based on the subgrade soil.

[0016]

EXAMPLES The present invention will be described in more detail with reference to examples of the present invention, but the present invention is not limited to these examples.

[Example 1] Using wet soil (water content 73%) as a base material, Eustaviller (trade name of cement-based solidifying material, manufactured by Ube Mitsubishi Cement Co., Ltd.) and FJ light (papermaking sludge reburned) (Commercial name of complete incinerated ash obtained from Shinryo Seisakusho Co., Ltd.) was added in the amount shown in Table 1. The obtained stabilized soil was tested for the items shown in Table 1. Table 1 shows the obtained values.

[0018]

[Table 1]

As is clear from Table 1, as the amount of Eustavir added increases from 5% to 10% of FJ light, the CBR value increases in proportion to the addition amount.
% To 15%, the CBR value gradually increases. Fifteen
%, Uneven mixing occurs and the strength varies.

Example 2 Using the same material as the base material, Eustaviller and FJ Wright used in Example 1, first, FJ Wright and Eustabira were used at 20:80, respectively.
A premix was prepared in a ratio of 50:50, 80:20. This was added to the substrate in the amount shown in Table 1,
The obtained stabilized soil was tested for the items shown in Table 2. Table 2 shows the obtained values.

[0021]

[Table 2]

As can be seen from Table 2, the premix has a ratio of FJ light: Eustabilizer of 20: 80-5.
At 0:50, an excellent CBR value is obtained, and a stabilized soil with improved strength is obtained. Also, when the amount of the premix added is 3 to 30%, an excellent CBR value can be obtained.

[Embodiment 3] A stabilized subgrade and a permeable subbase of the pavement structure shown in FIG. 1 and the stabilized soil produced in Examples 1 and 2 are used for the stabilized subgrade and the permeable subbase. Then, the pavement structure was constructed. Sample 1 was mixed with the stabilized subgrade, Sample 2 was mixed with the permeable subgrade, and Sample 3 was mixed with both the stabilized subgrade and the permeable subgrade. Evaluation was made as shown in Table 3.

[0024]

[Table 3]

[0025]

The stabilized subgrade according to the present invention is composed of subgrade soil, solidified material and completely incinerated ash as main components. It is effective for environmental preservation, has excellent durability, and is effective for controlling industrial waste and effective use. In the present invention, it is preferable that the solidification material is 3 to 30% by weight and the completely incinerated ash is 5 to 15% by weight with respect to the subgrade soil, since the above-mentioned effect is maximized.

In the present invention, by using a premix in which the solidified material and the completely incinerated ash are mixed in advance, scattering of the completely incinerated ash during construction is suppressed, and the workability is simple and easy. Mixing ratio of solidified material and complete incineration ash is 5: 5 to 8:
The effect is maximized by being 2. Furthermore, in the present invention, by including completely incinerated ash in the permeable roadbed, it is effective in preserving the water environment, the heat phenomenon on the road surface is suppressed, the durability is excellent, and furthermore, industrial waste is suppressed and effectively used. Thus, a pavement structure that is effective for the vehicle can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a pavement structure used in the present invention.

FIG. 2 is a partial perspective view showing a conventional pavement structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pavement structure 2 Stabilized subgrade 3 Permeable roadbed 4 Permeable layer 5 Cushion layer 6 Surface layer 7 Base layer 8 Drainage 9 Rainfall

Claims (5)

[Claims] 1. A stabilized subgrade comprising a subgrade soil, a solidified material and completely incinerated ash as main components. 2. The method according to claim 1, wherein the solidified material is 3 to 30% by weight and the completely incinerated ash is 5 to 15% by weight based on the subgrade soil.
The stabilized subgrade according to 1. 3. The stabilized subgrade according to claim 1, wherein the subgrade is made of a premix in which a solidified material and completely incinerated ash are mixed in advance. 4. The mixing ratio between the solidified material and the completely incinerated ash is 5: 5.
The stabilized subgrade according to any one of claims 1 to 3, wherein the ratio is 8: 2. 5. The pavement structure according to claim 1, wherein the permeable roadbed contains completely incinerated ash.