JP4640666B2 - Waste backfill material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backfill material made of waste, and more particularly to a backfill material made of waste with improved slurry flow characteristics and the like.
[0002]
[Prior art]
In recent years, as environmental regulations become stricter, more advanced treatment of waste and harmful substances has been demanded in addition to municipal waste and industrial waste. In addition, from the viewpoint of global environmental issues, resource retention, and difficulty in locating a disposal site, there is a tendency to recycle safely and effectively rather than simply disposing of waste and hazardous materials. Increasingly, many proposals have been made.
[0003]
For example, in order to reuse waste and hazardous materials as aggregates that are likely to be used safely and in large quantities, municipal waste incineration ash and earth and sand contaminated with hazardous materials are melted to treat hazardous materials. A melt processing method has been proposed, in which it is decomposed during the melting process or is stably contained in the melt.
[0004]
Similarly, ash (hereinafter referred to as PS ash) formed by incinerating sludge discharged from a paper mill is a waste material that is expected to be used as a ground material. In order to produce a backfill material by mixing and slurrying PS ash, cement and water as in the past, the flowability is high because the particle size portion corresponding to the portion is large and the particle size is too uniform. The situation was significantly worsened, and it was difficult to pump with the pump during construction.
[0005]
On the other hand, clay produced in the washing process when mountain sand is produced (hereinafter referred to as washed clay) has a high moisture content, so it can be used alone as a versatile backfill. In fact, it is difficult to effectively use waste that has become indispensable.
[0006]
Under the circumstances as described above, improvement measures for actively reusing PS ash and washed clay have been eagerly desired, and new development for expanding applications has been demanded.
[0007]
[Problems to be solved by the invention]
In view of the present situation described above, the present invention proposes an improvement measure for expanding the reuse of PS ash and washed clay, and improves the fluidity and gas permeability of the slurry necessary as a backfill material. It provides backfill material consisting of improved waste.
[0008]
[Means for Solving the Problems]
The backfill material made of waste in the invention of claim 1 is a backfill material obtained by mixing PS ash, cement and water into a slurry, and washing clay is added to a slurry containing 350 to 600 kg of PS ash per 1 m ^3. It is characterized by being added, and as a backfill material, desired fluidity is ensured to expand applications.
[0009]
The backfill material made of waste in the invention described in claim 2 is characterized in that in the backfill material made of waste in the invention of claim 1, the particle size of the slurry to which the washing clay is added is adjusted. In addition to the above functions, the fluidity is further improved.
[0010]
The backfill material made of waste in the invention according to claim 3 is the backfill material made of waste in the invention according to claim 1 or 2, wherein the foaming material is added to the slurry to which the washing clay is added. In addition to the above functions, voids are added to the slurry to increase the gas permeability of the backfill material.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The backfill material made of waste according to the present invention is basically a backfill material made by mixing PS ash, cement and water into a slurry, and adding a washing clay to the slurry made of PS ash, specifically, It is characterized by adjusting the particle size of the slurry to which the washing clay has been added, and further by adding a foaming material. The desired fluidity is ensured as a backfill material to expand the application.
[0012]
Hereinafter, embodiments of the present invention and test results thereof will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a schematic diagram for constructing a backfill material comprising waste according to the present invention. A PS ash slurry 1 of a backfill material constructed according to the present invention comprises PS ash 2 and cleaning as shown in the figure. It is constituted by blending clay 3, cement (type B blast furnace) 4 and water 5.
[0014]
In the blending adjustment, first, the PS ash 2 is slurried, the washing clay 3 is added thereto, and the particle size thereof is adjusted, and then the cement (type B blast furnace) 4 and water 5 are added. . Through the above steps, PS ash 2 is configured as a backfill material.
[0015]
The PS ash slurry after the addition of the cleaning clay 3 shows a flow value suitable for pumping as shown in the experimental results described later, and achieves the desired fluidization as a backfill material. .
[0016]
In addition, the present inventors have confirmed that the density can be adjusted by adding a foaming material to the PS ash slurry 1, but by using this as a backfill material, the PS ash can be adjusted. Improves the properties of backfill material consisting of slurry.
[0017]
That is, reducing the density of the PS ash slurry 1 forms voids inside the PS ash slurry 1, so that by adding a foaming material to the PS ash slurry 1, many voids are formed inside the PS ash slurry 1. The gas permeation characteristics required for the backfill material can be adjusted as appropriate.
[0018]
The above improvement effect is verified by the results of the experiments shown in FIGS. 2 and 3 and clarifies the effective function of the backfill material made of waste according to the present invention.
[0019]
2 shows various blending states of PS ash 2, washed clay 3, cement (type B blast furnace B) 4, and water 5 constituting the PS ash slurry 1. The characteristics are measured as 1-8.
[0020]
Experiment No. In 1 and 2, only the cement and washed clay are mixed with water without using PS ash slurry for reference experiments, and the change in properties is confirmed by changing the composition by changing the amount of cement. .
[0021]
Experiment No. In 3-6, it is a case where PS ash is reduced and washing clay is increased while making the amount of cement constant.
[0022]
On the other hand, experiment No. In Experiment No. 7, experiment no. Compared with up to 6, the amount of cement changed in the same manner was increased and at the same time water and PS ash were increased. In No. 8, in order to observe the characteristics when a surfactant (OFA) is added, the blend is reduced to about 1/2 of the washed clay, water, and PS ash.
[0023]
FIG. 3 shows measurement results for each formulation shown in FIG. 2, and shows experimental results for density, flow value, and strength expression.
[0024]
Experiment No. 1 and 2, the density is close to 1.4, the flow value by the P funnel test is 15 or 16.2 , and the strength on the 28th is 0.12 N / mm ² and the amount of cement is increased. It increases to 0.29 N / mm ² .
[0025]
In addition, experiment number No. related to the characteristics of the backfill material according to the present invention. 3 indicates that PS ash slurry is poor in fluidity so that measurement with a P funnel is impossible, and is unsuitable for pumping.
[0026]
However, as the washing clay is increased while gradually reducing the PS ash, the fluidity is improved. In the composition of 5, 13.3 seconds can be measured with a P funnel. Furthermore, the experiment number No. in which the ratio of PS ash and washed clay is changed to be approximately the same amount. In the composition of 6, the strength on the 28th is 0.23 N / mm ^2, and a sufficient strength as a backfill material can be confirmed.
[0027]
In addition, experiment number No. In the formulation of No. 7, the experiment was carried out by increasing the amount of cement and the amount of PS ash. However, the fluidity measured by the P funnel was sufficient, and the strength on the 28th was decreasing to 0.16 N / mm ^2. Even so, there is no problem as the strength of soil quality after backfilling.
[0028]
In addition, experiment no. 8 is a characteristic when surfactant (OFA) is added at about 0.75 kg / m ^3. As a result, although the fluidity is slightly deteriorated, the density is 0.846. Experiment No. No. in which the ratio of PS ash to washed clay was almost the same and no surfactant (OFA) was added. The density at 7 is reduced to about 2/3 compared to 1.367.
[0029]
This means that voids are added to the slurry, and as the backfilling material, the gas permeability is increased to improve the soil quality after backfilling, and a surfactant (OFA) is added. The addition becomes an effective means as the backfill material according to the present invention.
[0030]
Even if a surfactant (OFA) is added, the expression strength after 28 days has been confirmed to be sufficiently strong at 0.13 N / mm ² , so there is no problem with quality. Is in the situation.
[0031]
As confirmed by the above experiments, the waste backfill material according to the present invention exhibits the desired fluidity as the backfill material, and at the same time, there is no problem in its strength development. It is apparent that the gas permeability is increased by adding the foam material as described above.
[0032]
Therefore, the waste backfill material according to the present invention is a backfill material obtained by mixing PS ash with cement and water to form a slurry. It is characterized by adjusting the particle size of the slurry to which clay is added or adding a foaming material to the slurry. This ensures the desired fluidity and gas permeability as the backfill material, so PS ash And the use of washed clay, it has made a great contribution to the reuse of waste.
[0033]
As described above, the present invention has been described in detail on the basis of the embodiment. However, the waste backfill material according to the present invention is not limited to the above embodiment, and does not depart from the spirit of the present invention. Of course, various changes can be made.
[0034]
【The invention's effect】
The backfill material comprising the waste according to claim 1 is a backfill material obtained by mixing PS ash, cement and water into a slurry, and adding cleaning clay to a slurry containing 350 to 600 kg of PS ash per 1 m ^3. As a backfill material, the desired fluidity is ensured, and the effect of expanding the use of PS ash and washed clay as waste is exhibited.
[0035]
The backfill material made of waste according to claim 2 is characterized in that, in the backfill material made of waste in the invention according to claim 1, the particle size of the slurry to which the washing clay is added is adjusted, In addition to the effect, it exhibits the effect of further improving the fluidity.
[0036]
The backfill material made of waste in the invention according to claim 3 is the backfill material made of waste in the invention according to claim 1 or 2, wherein the foaming material is added to the slurry to which the washing clay is added. In addition to the above-described effects, it exhibits the effect of increasing the gas permeability of the backfill material by adding voids to the slurry.
[Brief description of the drawings]
FIG. 1 is a schematic diagram for constructing a backfill material composed of waste according to the present invention. FIG. 2 is a composition diagram for confirming characteristics of a backfill material composed of waste. Experiment number number results for backfill material consisting of

Claims (3)

A waste material comprising a slurry made by mixing incineration ash of paper sludge, cement and water into a slurry, wherein a washing clay is added to a slurry containing 350 to 600 kg of incineration ash of paper sludge per m ³ Backfill material consisting of.   The backfill material made of waste according to claim 1, wherein the slurry to which the washing clay is added is adjusted in particle size.   The backfilling material comprising a waste according to claim 1 or 2, wherein the foaming material is added to the slurry to which the washing clay is added.

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