JPH1060469A - Composition for one powder type slow-hardening back-filling material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable effective utilization of powdery industrial waste embarrassing in its disposition as a back-filling material having a prescribed viscosity and bleeding percentage after being kneaded with water without damage to the moisture-absorbing function of the smectite type clay mineral, even when it is premixed, developing a prescribed strength after hardening, being formulated promptly on site with no occurrence of formulation miss by the worker. SOLUTION: A smectite type clay mineral, for example, bentonite, a siliceous powder, a powdery industrial waste, for example, blast-furnace slag, a powder of waste concrete, ash of fluid-bed boiler, sewage sludge molten stag, garbage incineration molten slag, a thickener and a retarding admixture are uniformly formulated in a prescribed proportion. The blast-furnace slag may be displaced with cement or a mixture thereof with blast furnace slag, or may be displaced with a combination of blast furnace slag with fly ash.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backfill material or a seawall which is injected into a gap between a pipe body and a ground when the pipe body is laid underground by a propulsion method and also has a sliding material function.・
One-powder type gradual hardening backing material suitable for ground improvement such as quay foundation ground improvement, synthetic steel pipe pile method, continuous wall method, deep ground improvement, and other backfill materials injected into civil engineering sites It is about things.

[0002]

2. Description of the Related Art The applicant of the present invention has a function of both a lubricating material and a backfill material to reduce the frictional resistance between the ground and the pipe body during the propulsion method, and to reduce the friction between the pipe body and the ground body. A patent application was filed for a "self-hardening lubricating material" that can prevent land subsidence caused by a gap between the two (Japanese Patent Application Laid-Open No. 62-265395). This self-hardening lubricating material is composed of bentonite, a super absorbent resin and / or
Or, in 1 m ³ of a lubricating material for propulsion method composed of methyl cellulose and water, 50 to 250 kg of cement, 20 to 40 wt% of main chemical composition Al ₂ O ₃ , 30 to 50 wt% of CaO, 10 to 30 wt of SO ₃ % Containing 2%
15 kg and 1 to 10 kg of a setting retarder are added.

[0003] This self-hardening lubricant has the following properties. That is, the flow time of the JA funnel is 12 seconds or less without largely deviating from the fluidity of the conventional sliding material. Slip resistance is small, and 0.03 kgf /, considering the frictional resistance between the pipe body and the ground, until the propulsion method is completed.
Maintain a shear strength of not more than cm ² . 90 days after injection, same strength as the ground, generally 1-2kg
The strength becomes f / cm ² or more. The bleeding rate is 5% or less for the integration of the pipe body and the ground. Then, the self-hardening lubricant is prepared by mixing bentonite with a superabsorbent resin and / or methylcellulose and water at a construction site to prepare bentonite muddy water. And kneading them uniformly with a mixer.

[0004]

However, in order to prepare this self-hardening lubricating material, it takes a long time to prepare several or more kinds of materials, and if the operator is immature, there is a possibility that a mixing mistake may occur. . For this reason, it is conceivable that the powdered material excluding water is preliminarily mixed and premixed, but when the powdered material is premixed, bentonite becomes calcium hydroxide formed by hydration of cement. And, in the presence of calcium ions, its water absorbing function, that is, the swelling function is suppressed, and even when preparing a sliding material by kneading with water at the time of construction, proper viscosity is not obtained in the sliding material, and bleeding becomes excessive. Therefore, premixing of the self-hardening lubricant has not been attempted so far.

On the other hand, in the industry, a large amount of powdery industrial waste is generated which is difficult to dispose of concrete waste material powder, fluidized bed boiler ash, sewage sludge melting slag, refuse incineration ash melting slag, and the like. Is desired.

An object of the present invention is to provide a one-powder type slowly hardening backing material composition which does not impair the moisture absorption function of a smectite type clay mineral even when premixed. Another object of the present invention is to obtain a predetermined viscosity after kneading with water,
An object of the present invention is to provide a one-powder type slowly hardening backing material composition which becomes a backing material having a small bleeding rate and exhibits a predetermined strength after curing. Another object of the present invention is to provide a one-powder type slowly hardening backing material composition that can be quickly compounded at a construction site and does not cause a compounding error by an operator. Still another object of the present invention is to provide a one-powder type slowly hardening backing material composition that can effectively utilize powdered industrial waste.

[0007]

The invention according to claim 1 is
A one-powder type slowly hardening backing material composition prepared by uniformly mixing a smectite type clay mineral, concrete waste powder, siliceous powder, blast furnace slag, cement, a thickener, and a setting retarder in a predetermined ratio. It is. The invention according to claim 2 is a one-powder type stiffness prepared by uniformly mixing a smectite-type clay mineral, a concrete waste powder, a siliceous powder, a blast furnace slag, a thickener, and a setting retarder in a predetermined ratio. It is a composition for backfill material. The invention according to claim 3 is a powder prepared by uniformly mixing a smectite-type clay mineral, a concrete waste powder, a siliceous powder, a blast furnace slag, a fly ash, a thickener, and a setting retarder in a predetermined ratio. It is a composition for a mold-graded backfill material. The invention according to claim 4 is a powder prepared by uniformly mixing a smectite-type clay mineral, a fluidized-bed boiler ash, a siliceous powder, a blast furnace slag, a cement, a thickener, and a setting retarder in a predetermined ratio. It is a composition for a mold-graded backfill material. The invention according to claim 5 is a one-powder type slurry prepared by uniformly mixing a smectite-type clay mineral, a fluidized-bed boiler ash, a siliceous powder, a blast furnace slag, a thickener, and a setting retarder in a predetermined ratio. A composition for a hard backfill material.

According to a sixth aspect of the present invention, a smectite type clay mineral, a fluidized bed boiler ash, a siliceous powder, a blast furnace slag, a fly ash, a thickener, and a setting retarder are uniformly mixed at a predetermined ratio. The composition for a one-powder type gradually hardening backing material is provided. The invention according to claim 7 is a one-powder type stiffness prepared by uniformly mixing a smectite-type clay mineral, sewage sludge molten slag, siliceous powder, cement, a thickener and a setting retarder at a predetermined ratio. It is a composition for backfill material. Claim 8
The invention according to the invention is a one-powder type stiffness prepared by uniformly mixing a smectite type clay mineral, sewage sludge molten slag, siliceous powder, cement, blast furnace slag, a thickener and a setting retarder in a predetermined ratio. It is a composition for backfill material. The invention according to claim 9 is a one-powder type slurry prepared by uniformly mixing a smectite-type clay mineral, refuse incineration ash molten slag, siliceous powder, cement, a thickener, and a setting retarder at a predetermined ratio. A composition for a hard backfill material. According to a tenth aspect of the present invention, a smectite-type clay mineral, refuse incineration ash molten slag, siliceous powder, cement, blast furnace slag, a thickener, and a setting retarder are uniformly mixed at a predetermined ratio. It is a powder type slowly hardening backing material composition. In the invention according to any one of claims 1 to 10, even if premixed, the moisture absorption function of the smectite-type clay mineral is not impaired, and becomes a backfill material having a predetermined viscosity and bleeding rate after kneading with water, and after curing. It exhibits a predetermined strength and can be quickly compounded at the construction site, so that there is no mistake in compounding by workers. In addition, by using concrete waste powder, fluidized bed boiler ash, sewage sludge melting slag, garbage incineration ash melting slag,
It is possible to use powdery industrial waste that is in need of disposal.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The composition for a one-powder type gradually hardening backing material according to claim 1 comprises 5-2,000 parts by weight of concrete waste material powder and 5-5-2 parts by weight based on 100 parts by weight of smectite type clay mineral. 2000 parts by weight of siliceous powder, 5 to 200 parts
0 parts by weight of blast furnace slag, 3 to 800 parts by weight of cement, 2 to 1000 parts by weight of thickener, 0.2 to 1000 parts by weight
Contains parts by weight set retarder. The composition for a one-powder type slow-hardening backing material according to claim 2 comprises 5 to 1500 parts by weight of a concrete waste material powder and 3 to 1500 parts by weight of a siliceous substance based on 100 parts by weight of a smectite-type clay mineral. Powder and 5
It contains 1500 parts by weight of blast furnace slag, 2 to 800 parts by weight of a thickener, and 0.2 to 800 parts by weight of a setting retarder. The composition for a one-powder type slowly hardening backing material according to claim 3 has 100
5 to 200 parts by weight of the smectite-type clay mineral
0 parts by weight of concrete waste powder, 5 to 2000 parts by weight of siliceous powder, 5 to 2000 parts by weight of blast furnace slag, 5 to 2000 parts by weight of fly ash, 2 to 10 parts by weight
It contains 00 parts by weight of a thickening agent and 0.2 to 1000 parts by weight of a setting retarder.

[0010] The composition for a one-powder type slow-hardening backing material according to claim 4 comprises 5 to 1500 parts by weight of a fluidized bed boiler ash and 3 to 1 parts by weight based on 100 parts by weight of a smectite type clay mineral.
500 parts by weight of siliceous powder, 5 to 1500 parts by weight of blast furnace slag, 3 to 800 parts by weight of cement, 2 to 8 parts
It contains 00 parts by weight of a thickener and 0.2 to 800 parts by weight of a setting retarder. The composition for a one-powder type slow-hardening backing material according to claim 5, comprising 100 parts by weight of a smectite-type clay mineral, 5 to 2000 parts by weight of a fluidized-bed boiler ash, and 5 to 2 parts by weight.
000 parts by weight of siliceous powder, 5 to 2000 parts by weight of blast furnace slag, 2 to 800 parts by weight of thickener, 0.2 to
Contains 800 parts by weight set retarder. The composition for a one-powder type slow-hardening backing material according to claim 6, comprising 5 to 1500 parts by weight of a fluidized-bed boiler ash and 5 to 1500 parts by weight of silicic acid based on 100 parts by weight of a smectite-type clay mineral. Powder and
5 to 1500 parts by weight of blast furnace slag, 5 to 1500 parts by weight of fly ash, and 2 to 800 parts by weight of a thickener,
It contains 0.2-800 parts by weight of a set retarder.

[0011] The one-powder type gradually hardening backing material composition according to claim 7 is characterized in that, based on 100 parts by weight of smectite type clay mineral, 5 to 2000 parts by weight of sewage sludge molten slag;
2000 parts by weight of siliceous powder, 3 to 800 parts by weight of cement, 2 to 1000 parts by weight of thickener, 0.2 to
Contains 800 parts by weight set retarder. The composition for a one-powder type slow-hardening backing material according to claim 8, wherein the sewage sludge molten slag and the silicate are contained in an amount of 5 to 1500 parts by weight based on 100 parts by weight of the smectite-type clay mineral. 3 to 800 parts by weight of cement, 5 to 1500 parts by weight of blast furnace slag, 2 to 800 parts by weight of thickener,
It contains 2 to 800 parts by weight of a set retarder. The composition for a one-powder type slow-hardening backing material according to claim 9, comprising 5 to 2000 parts by weight of refuse incineration ash molten slag and 5 to 2000 parts by weight of silica based on 100 parts by weight of smectite type clay mineral. Acidity powder, 3 to 800 parts by weight cement, 2 to 1000 parts
Parts by weight of a thickening agent and from 0.2 to 800 parts by weight of a setting retarder. The composition for a one-powder type slow-hardening backing material according to claim 10, comprising 5 to 1500 parts by weight of refuse incineration ash molten slag and 100 parts by weight of smectite-type clay mineral.
To 1500 parts by weight of siliceous powder, 3 to 800 parts by weight of cement, 5 to 1500 parts by weight of blast furnace slag,
１０００1000 parts by weight thickener and 0.2-800 parts by weight set retarder.

In the first to third aspects, the preferable content of the concrete waste material powder is 20 to 800 parts by weight. The preferred content of the siliceous powder is 50 in claims 1 to 10.
１０００1000 parts by weight. The preferred content of the fluidized-bed boiler ash in claims 4 to 6 is 20 to 800 parts by weight. In claims 7 and 8, the preferred content of the sewage sludge molten slag is 10 to 800 parts by weight. In Claims 9 and 10, the preferable content of the refuse incineration ash molten slag is 20 to 800 parts by weight. Claims 1 to 6, 8 and 10
The preferred content of blast furnace slag is 100 to 100
0 parts by weight. In claims 1, 4, 7 to 10, the preferred content of cement is 50 to 500 parts by weight. In claims 3 and 6, the preferred content of fly ash is 100 to 1000 parts by weight. In Claims 1 to 10, the preferred content of the thickener is 5 to 500 parts by weight. The preferred content of the setting retarder in claims 1 to 10 is 2 to 500 parts by weight.

Concrete waste powder, fluidized bed boiler ash,
If the sewage sludge molten slag and the refuse incinerated ash molten slag are less than the above lower limit, the utilization of industrial waste is not sufficient, and if the sewage sludge molten slag is more than the above upper limit, there is a problem that strength developability decreases.
If the siliceous powder is less than the above lower limit, the swelling of the smectite-type clay mineral will be impaired, and if it exceeds the above upper limit, it will be difficult to obtain an appropriate viscosity. If the blast furnace slag is less than the lower limit, the swelling of the smectite-type clay mineral is impaired,
Exceeding the above upper limit causes a problem that it is difficult to obtain an appropriate viscosity. If the cement is less than the above lower limit, the strength development becomes insufficient, and if it exceeds the above upper limit, the swelling of the smectite type clay mineral is impaired. If the fly ash deviates from the above range, a problem arises in which appropriate viscosity cannot be obtained as a backfill material. If the thickener is less than the above lower limit, material separation is liable to occur, and if it exceeds the above upper limit, handling deteriorates and becomes uneconomical. If the setting retarder is less than the above lower limit value, it is difficult to obtain gradual hardening, and if it exceeds the above upper limit value, there occurs a problem that a proper curing time is deviated.

Each of the materials will be described in detail through the composition for a slowly hardening backing material according to any one of the first to tenth aspects. In addition, the composition for a gradual hardening backfill material of the present invention is prepared by uniformly mixing the respective fine powder materials. Examples of the smectite-type clay mineral of the present invention include layered silicates such as bentonite, montmorillonite, beidellite, nontronite, saponite, iron saponite, hectorite, and various types of exchangeability of Na ions, Ca ions, etc. between layers. Powders containing cations may be mentioned. The above-mentioned layered silicates may be used alone or in combination. This smectite-type clay mineral has the property of taking in water between layers and swelling.
The smectite-type clay mineral is used to obtain a backing material having a desired viscosity.

The concrete waste material powder, fluidized bed boiler ash, sewage sludge melting slag, and refuse incineration ash melting slag, which are the industrial wastes of the present invention, each have a Blaine value (specific surface area) of 1000 to 6000 cm ² / g, preferably. Is 20
A powder of 00 to 4500 cm ² / g is used. When these powders are used in place of silica sand, the particle size is 0.01
１．０1.0 mm, preferably 0.05-0.6 mm. Further, the shrinkage reducing agent has a particle size of 0.6 mm or less,
Preferably, one having a thickness of 0.3 mm or less is used.

The siliceous powder of the present invention includes powdered silica,
Silica sand for castings, silicate clay, and the like. As the blast furnace slag of the present invention, blast furnace slag fine powder for concrete (JI
(SA6206-1995) are preferred. As the cement of the present invention, (A) Portland cement such as ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement, moderate heat Portland cement, etc., (a) blast furnace cement, fly ash cement, mixed cement such as silica cement (C) low heat Portland cement, (d) cement using an admixture for mass concrete, (e) soil stabilizing cement, (f) silica fume cement, and the like. The above cements (A) to (F) may be used alone or in combination of two or more.
Cement is used to develop the strength of the backfill after hardening.

The fly ash of the present invention is mainly composed of SiO ₂ or Al ₂ O ₃ which is generated in a thermal power plant using coal or the like.
Coal ash. It is more preferable that it is specified in JIS A6201.

Examples of the thickener of the present invention include methylcellulose, ethylcellulose, cellulose derivatives, soluble starch, pregelatinized starch, dextrin, acrylic polymers, and acrylic insoluble admixtures in water. These thickeners may be used alone or in combination of two or more. Thickeners are used to increase the stiffness of the backfill and reduce bleeding. Examples of the setting retarder of the present invention include ligninsulfonic acid or a salt thereof, oxycarboxylic acid or a salt thereof, polyvinyl alcohol, a polyol complex, celluloses, saccharides, phosphates, silicofluorides, zinc oxide, zinc chloride, and lead oxide. , Boron oxide, borax, magnesium halides such as magnesium chloride, and magnesium compounds such as magnesium nitrate. These set retarders may be used alone or in combination of two or more. Setting retarders retard the hydration of the cement and / or filler and increase the stiffness of the backing material.

In order to prepare the composition for a one-powder type slow-hardening backfill material of the present invention, each material is dry-mixed by a usual powder mixing apparatus such as a V-type mixer, a vertical mixer, a universal mixer or the like. In addition, in order to prepare a backing material using the one-powder type slow-hardening backing material composition of the present invention, the one-powder type slow-hardening backing material composition 1
It is prepared by mixing 30 to 500 parts by weight, preferably 100 to 400 parts by weight of water with respect to 00 parts by weight using a mixer.

[0020]

Next, examples of the present invention will be described together with comparative examples. <Example 1> With respect to 100 parts by weight of bentonite which is a smectite-type clay mineral, the Blaine value was 3200 cm ^2.
/ G concrete waste powder 50 parts by weight, siliceous powder 200 parts by weight, blast furnace slag 200 parts by weight, and ordinary Portland cement 50 parts by weight are collected in a container of a universal mixer, and a stirring blade is attached thereto. The mixture was first stirred at low speed for 10 minutes. Subsequently, 4 parts by weight of an acrylic insoluble admixture in water and 2 parts by weight of methylcellulose, which are thickeners, and 6 parts by weight of citric acid as a setting retarder were further added to this container, and the stirring speed was increased to 20 minutes. The mixture was stirred and mixed to prepare a one-powder type slowly hardening backing material composition, which was placed in a closed container.

Example 2 Instead of adding no cement, the concrete waste material powder was increased to 200 parts by weight and the siliceous powder was reduced to 100 parts by weight. 2 parts by weight of the agent and 2 parts by weight of methylcellulose, and 4 parts by weight of a setting retarder, citric acid, were added in the same manner as in Example 1 to prepare a one-powder type slowly hardening backing material composition. Was placed in a closed container.

Example 3 Instead of adding no cement, 100 parts by weight of fly ash was newly added, the amount of concrete waste powder was increased to 100 parts by weight, the amount of siliceous powder was reduced to 100 parts by weight, and the viscosity was increased. One-powder type slowly hardening backing was carried out in the same manner as in Example 1 except that 2 parts by weight of an acrylic insoluble admixture in water and 2 parts by weight of methylcellulose were added as well as 3 parts by weight of citric acid as a setting retarder. A composition for a filling material was prepared and placed in a closed container.

<Comparative Example 1> A one-powder type slowly hardening backing material composition was prepared in the same manner as in Example 1 except that the amount of cement was increased to 100 parts by weight instead of adding no concrete waste material powder. Placed in closed container.

<Comparative Example 2> Instead of adding concrete waste powder and cement, fly ash 200 was newly added.
Parts by weight, 0.2 parts by weight of slaked lime and 4 parts by weight of a hydraulic substance, the siliceous powder was reduced to 100 parts by weight, the blast furnace slag was reduced to 196 parts by weight, and acrylic water as a thickener was added. A one-powder type slowly hardening backing material composition was prepared in the same manner as in Example 1 except that 2 parts by weight of an inseparable admixture and 3 parts by weight of citric acid as a setting retarder were further added. Placed in closed container.

In the composition for the one-powder type slowly hardening backing material of Example 1, 1782 parts by weight of water was added, and in the composition for the one-powder type slowly hardening backing material of Example 2, 1778 parts by weight of water was used. In addition, 1772 parts by weight of water was used for the one-powder type gradually hardening backing material composition of Example 3, and 17
86 parts by weight of water and 1768 parts by weight of water were added to the one-powder type slowly hardening backing material composition of Comparative Example 2 and mixed.
Various backfill materials were prepared. The composition is shown in Table 1.

[0026]

[Table 1]

(Note) In Table 1, thickener A indicates an acrylic insoluble admixture in water, and thickener B indicates methylcellulose.

<Physical Properties of Backfill Material and Strength after Curing> Using the gradually hardened backfill materials of Examples 1 to 3 and Comparative Examples 1 and 2,
The viscosity, bleeding rate, and strength after curing were measured. Table 2 shows the results. The viscosity was measured with a rotational viscometer. The bleeding rate is JSCE-F5
22-1994, "Poured mortar test method for prepacked concrete". Regarding the strength, for those that are relatively soft, a vane test (in-situ vane shear test according to JGS 1411-1995) was performed by the soil survey method, and the shear strength was determined. Was added. In addition, those cured to a certain degree were subjected to a uniaxial compression test based on the provisions of JIS A1216T “Uniaxial compression test method for soil”, and the symbol “q _u ” was added in Table 2. The age of the specimen is 10 days, 3 days
0 day, 50 days, 70 days, 90 days, 110 days and 130 days.

[0029]

[Table 2]

The following was found from Table 2. The compositions for the one-powder type slow-hardening backing material of the present invention prepared from Examples 1 to 3 using powdered industrial wastes were compared in terms of viscosity, bleeding rate and strength without using powdered industrial wastes. It was almost equivalent to the specimens of Examples 1 and 2, and showed sufficient performance as a backfill material.

Example 4 A 100% by weight of bentonite which is a smectite type clay mineral has a Blaine value of 2
50 parts by weight of 560 cm ² / g fluidized bed boiler ash, 200 parts by weight of siliceous powder, 200 parts by weight of blast furnace slag, and 50 parts by weight of ordinary Portland cement are collected in a vessel of a universal mixer, and the stirring blades are collected. Attach, first at low speed 1
Stirred for 0 minutes. Subsequently, 4 parts by weight of an acrylic insoluble admixture in water and 2 parts by weight of methylcellulose, which are thickeners, and 6 parts by weight of citric acid as a setting retarder were further added to this container, and the stirring speed was increased to 20 minutes. The mixture was stirred and mixed to prepare a one-powder type slowly hardening backing material composition, which was placed in a closed container.

<Example 5> Instead of adding cement, the fluidized bed boiler ash was increased to 200 parts by weight, and the siliceous powder was reduced to 100 parts by weight. 2 parts by weight of admixture and methyl cellulose 2
In the same manner as in Example 4 except that 4 parts by weight of citric acid as a setting retarder was further added, a one-powder type slowly hardening backing material composition was prepared and placed in a closed container.

<Example 6> Instead of adding no cement, 100 parts by weight of fly ash was newly added, the fluidized bed boiler ash was increased to 100 parts by weight, and the siliceous powder was added in an amount of 1 part.
Example 4 except that the amount was reduced to 00 parts by weight, and 2 parts by weight of an acrylic insoluble admixture in water and 2 parts by weight of methylcellulose, which were thickeners, and 3 parts by weight of citric acid as a setting retarder were further added. In the same manner, a one-powder type slowly hardening backing material composition was prepared and placed in a closed container.

<Comparative Example 3> A one-powder type slowly hardening backing material composition was prepared in the same manner as in Example 4 except that the amount of cement was increased to 100 parts by weight instead of adding the fluidized bed boiler ash. Was placed in a closed container.

Comparative Example 4 Instead of adding fluidized bed boiler ash and cement, 200 parts by weight of fly ash, 0.2 part by weight of slaked lime and 4 parts by weight of a hydraulic substance were added, and a siliceous powder was added. 100 parts by weight, blast furnace slag to 196 parts by weight, 2 parts by weight of an acrylic insoluble admixture in water as a thickener, and 3 parts by weight of citric acid as a setting retarder Prepared a one-powder type slowly hardening backing material composition in the same manner as in Example 4, and placed this in a closed container.

1780 parts by weight of water was used for the one-powder type slowly hardening backing material composition of Example 4, and 1768 parts by weight of water was used for the one-powder type slowly hardening backing material composition of Example 5. 1768 parts by weight of water was used for the composition for the one-powder type slow-hardening backing material of Example 6, and 17
86 parts by weight of water and 1768 parts by weight of water were further added to the one-powder type slowly hardening backing material composition of Comparative Example 4 and mixed.
Various backfill materials were prepared. The composition is shown in Table 3.

[0037]

[Table 3]

<Physical Properties of Backfill Material and Strength after Curing> Using the gradually hardening backfill materials of Examples 4 to 6 and Comparative Examples 3 and 4,
The viscosity, bleeding rate, and strength after curing were measured. Table 4 shows the results.

[0039]

[Table 4]

The following was found from Table 4. The compositions for the one-powder type slow-hardening backing material of the present invention prepared from Examples 4 to 6 using powdery industrial wastes were compared in terms of viscosity, bleeding rate and strength without using powdery industrial wastes. It was almost equivalent to the specimens of Examples 3 and 4, and showed sufficient performance as a backfill material.

Example 7 A Blaine value of 3 per 100 parts by weight of bentonite which is a smectite-type clay mineral was used.
200 parts by weight of sewage sludge molten slag of 230 cm ² / g, 200 parts by weight of siliceous powder, and 100 parts by weight of ordinary Portland cement were collected in a container of a universal mixer, and a stirring blade was attached. Stirred for minutes. Subsequently, 4 parts by weight of an acrylic insoluble admixture in water and 2 parts by weight of methylcellulose, which are thickeners, and 6 parts by weight of citric acid as a setting retarder were further added to this container, and the stirring speed was increased to 20 minutes. The mixture was stirred and mixed to prepare a one-powder type slowly hardening backing material composition, which was placed in a closed container.

<Example 8> A one-powder type slowly hardening backing material composition was prepared in the same manner as in Example 7 except that 100 parts by weight of blast furnace slag was newly added, and this was placed in a closed container.

<Example 9> A one-powder type slowly hardening backing material composition was prepared in the same manner as in Example 7 except that sewage sludge molten slag was not added and 200 parts by weight of refuse incineration ash molten slag was newly added. Was prepared and placed in a closed container.

<Example 10> Instead of adding sewage sludge molten slag, 100 parts by weight of garbage incinerated ash molten slag was newly added, and 100 parts by weight of blast furnace slag was further added, except that blast furnace slag was added. A powdery slow-hardening backing material composition was prepared and placed in a closed container.

<Comparative Example 5> A one-powder type slowly hardening backing material composition was prepared in the same manner as in Example 7, except that 200 parts by weight of blast furnace slag was newly added instead of adding sewage sludge molten slag. This was placed in a closed container.

1788 parts by weight of water was added to the one-powder type slowly hardening backing material composition of Example 7, and 1786 parts by weight of water was used to the one-powder type slowly hardening backing material composition of Example 8. The composition for the one-powder type slow-hardening backing material of Example 9 contained 1788 parts by weight of water, and the composition for the one-powder-type slow-hardening backing material of Example 10 contained 1
786 parts by weight of water and 1786 parts by weight of water were added to the one-powder type slowly hardening backing material composition of Comparative Example 5, and mixed.
Five types of backfill materials were prepared. Table 5 shows the composition.

[0047]

[Table 5]

<Physical Properties of Backfill Material and Strength after Curing> Using the slow-hardening backfill materials of Examples 7 to 10 and Comparative Example 5, the viscosity, bleeding ratio, and strength after curing were measured. Table 6 shows the results.

[0049]

[Table 6]

The following was found from Table 6. The composition for the one-powder type slow-hardening backing material of the present invention prepared from Examples 7 to 10 using powdered industrial wastes was compared in terms of viscosity, bleeding rate and strength without using powdered industrial wastes. It was almost equivalent to the specimen of Example 5, and showed sufficient performance as a backfill material.

[0051]

As described above, the one-powder type slowly hardening backing material composition of the present invention does not impair the water absorption function of the smectite-type clay mineral even if it is premixed. Does not need to be separately prepared, can be quickly compounded at the construction site, and the adverse effect on the construction of the gradual backing material can be minimized. Also, even if the worker is immature, there is no possibility of mis-mixing. In addition, when injected around the pipe body during the propulsion of the pipe body in the propulsion method, the function as a lubricating material is maintained during the propulsion period, and after the propulsion, sufficient strength is exhibited as the backfill material as it is.
Further, with such a function, in a large-scale civil engineering work, integration of construction sections can be realized, and since there is no hardening of an overlap portion, a decrease in work efficiency can be prevented. In addition, since the industrial waste in powder form can be effectively used, it is a gospel for the industry that was in need of disposing of such industrial waste.

Claims (10)

[Claims] 1. A one-powder type hardened backing prepared by uniformly mixing a smectite type clay mineral, concrete waste powder, siliceous powder, blast furnace slag, cement, thickener and setting retarder in a predetermined ratio. Composition for filling material. 2. A one-powder type gradually hardening backing material prepared by uniformly mixing a smectite type clay mineral, concrete waste powder, siliceous powder, blast furnace slag, a thickener, and a setting retarder in a predetermined ratio. Composition. 3. A one-powder type stiffness prepared by uniformly mixing a smectite type clay mineral, a concrete waste powder, a siliceous powder, a blast furnace slag, a fly ash, a thickener and a setting retarder in a predetermined ratio. Composition for backfill material. 4. A one-powder type stiffness prepared by uniformly mixing a smectite type clay mineral, a fluidized bed boiler ash, a siliceous powder, a blast furnace slag, a cement, a thickener and a setting retarder in a predetermined ratio. Composition for backfill material. 5. A one-powder type gradually hardened backfill prepared by uniformly mixing a smectite type clay mineral, a fluidized bed boiler ash, a siliceous powder, a blast furnace slag, a thickener and a setting retarder in a predetermined ratio. Material composition. 6. A one-powder type slurry prepared by uniformly mixing a smectite-type clay mineral, a fluidized-bed boiler ash, a siliceous powder, a blast furnace slag, a fly ash, a thickener and a setting retarder in a predetermined ratio. A composition for a hard backfill material. 7. A one-powder type gradually hardening backing material prepared by uniformly mixing a smectite type clay mineral, a sewage sludge molten slag, a siliceous powder, a cement, a thickener and a setting retarder in a predetermined ratio. Composition. 8. A one-powder type stiffness prepared by uniformly mixing a smectite-type clay mineral, sewage sludge molten slag, siliceous powder, cement, blast furnace slag, a thickener and a setting retarder in a predetermined ratio. Composition for backfill material. 9. A one-powder type gradually hardened backfill prepared by uniformly mixing a smectite type clay mineral, refuse incineration ash molten slag, siliceous powder, cement, a thickener and a setting retarder in a predetermined ratio. Material composition. 10. A one-powder type slurry prepared by uniformly mixing a smectite-type clay mineral, refuse incineration ash molten slag, siliceous powder, cement, blast furnace slag, a thickener and a setting retarder in a predetermined ratio. A composition for a hard backfill material.