JPH09176643A - Agent for granulating water-containing soil and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a granulating agent which is used for granulating water- contg. soil into fine granules having prescribed granular sizes and enough strengths and is suitable in reusing water-contg. soil as a resource, e.g. as a substitute for sand, and to provide a method for granulating water-contg. soil using the same. SOLUTION: This granulating agent comprising water glass, an acidic substance, a hydraulic material, and, if necessary, a polyvalent metal compd. is used for granulating water-contg. soil. An example of the acidic substance is polyacrylic acid and/or its partial salt. An example of the hydraulic material is cement. An example of the metal compd. is calcium chloride dihydrate. After water-contg. soil is mixed with water glass, the acidic substance, and the metal compd. and granulated, the hydraulic material is added to the resultant granules. Thus water-contg. soil is converted into fine granules having prescribed granular sizes and enough strengths.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a particle-forming agent and a particle-forming method for hydrous soil, and more specifically, it is intended to granulate hydrous soil and reuse it as a resource such as a substitute for sand. In this case, the present invention relates to a suitable particle forming agent and a particle forming method.

[0002]

2. Description of the Related Art Generally, for example, in excavation work employing a muddy water shield method or the like, excavated soil generated during excavation is discharged to the outside together with the excavated muddy water by supplying excavated muddy water to an excavation hole. The generated soil is reused after the soil is separated, and the rest is discarded as mud. Accordingly, the muddy water is a slurry containing a large amount of water together with the clay. And the above-mentioned muddy water must be treated as industrial waste. Therefore, after carrying out solid-liquid separation by dewatering and pressing the muddy water so that it can be transported, sludge obtained as a dehydrated cake or the like, that is, by mixing a water-absorbent resin, cement or the like with water-containing soil. It is being made into particles. Examples of such a processing method include, for example, Japanese Patent Laid-Open Nos. 64-51198 and 1-1391.
Japanese Patent Publication No. 98 discloses a reforming method of mixing a water-soluble soil with a water-soluble synthetic polymer having cohesive property, a hydroxide such as magnesium, calcium, or aluminum, and a hydraulic cement. . The reforming method is a method for reuse.

[0003]

However, in the above-mentioned conventional method of forming particles, the particle size of the granulated material obtained by granulating the water-containing soil becomes relatively large. Further, the strength of the granulated product after being solidified by hydraulic cement is also relatively low. Therefore, there is a problem that the granular material cannot be effectively utilized (reused) as a resource such as a substitute for sand. For this reason, there is a strong demand for a particle formation method capable of reusing the water-containing soil.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to make water-containing soil into particles so that the water-containing soil after particle formation has a predetermined particle size, and
An object of the present invention is to provide a particle forming agent and a particle forming method which are suitable for making particles into particles having sufficient strength and reusing them as a resource such as a substitute for sand.

[0005]

Means for Solving the Problems In order to achieve the above-mentioned object, the inventors of the present application have made extensive studies on a particle-forming agent and a particle-forming method for hydrous soil. As a result, water glass, an acidic substance, and by granulating the hydrous soil using a particleifying agent consisting of a hydraulic substance, the hydrous soil after granulation has a predetermined particle size, and sufficient strength. The present invention has been completed by discovering that it can be effectively used as, for example, a substitute for sand, etc. by being made finer into particles.

[0006] That is, in order to solve the above problems, the water-containing soil particle-forming agent of the invention of claim 1 is
It is characterized by being composed of an acidic substance and a hydraulic substance. In order to solve the above-mentioned problems, the water-containing soil particle forming agent according to claim 2 is the same as the water-containing soil particle forming agent according to claim 1, wherein the acidic substance is a polycarboxylic acid and / or a partial salt thereof. It is characterized by being. In order to solve the above-mentioned problems, the water-containing soil particle forming agent of the invention of claim 3 is characterized in that the water-containing soil particle forming agent of claim 1 or 2 further comprises a polyvalent metal compound. There is.

According to the above construction, the water-containing soil (hereinafter referred to as "particles") after being made into particles has a predetermined particle size, and
The particles are refined into particles having sufficient strength (hereinafter, simply referred to as refinement). As a result, the above-mentioned particulate matter can be effectively utilized as a substitute for sand, for example.
That is, the particulate matter can be reused as a resource. In addition, since the particulate matter can be reused, environmental protection, resource saving, and life extension of the disposal site can be achieved and the disposal cost of the water-containing soil can be reduced.

Further, in order to solve the above-mentioned problems, the method for granulating water-containing soil according to a fourth aspect of the present invention comprises mixing water glass and an acidic substance into the water-containing soil, granulating the mixture, and then The feature is that a hydraulic substance is added to the granules. In order to solve the above-mentioned problems, the method for granulating water-containing soil according to the invention of claim 5 comprises mixing water glass, an acidic substance and a polyvalent metal compound into the water-containing soil and granulating the mixture, The feature is that a hydraulic substance is added to the granules.

According to the above method, it is possible to make the particles into fine particles. As a result, the above-mentioned particulate matter can be effectively utilized as a substitute for sand, for example. That is, the particulate matter can be reused as a resource.
In addition, since the particulate matter can be reused, environmental protection, resource saving, and life extension of the disposal site can be achieved and the disposal cost of the water-containing soil can be reduced.

The present invention will be described in detail below. The hydrous soil suitable for being granulated by the granulating agent and the granulating method according to the present invention is mainly composed of clay or silt, and for example, excavation work adopting an underground continuous wall method, a mud shield method, etc. Sludge obtained as a dehydrated cake after separation of soil generated during excavation in soil into sediment and muddy water and solid-liquid separation by dewatering pressing the muddy water, etc .; Muddy water generated during construction work The sludge (construction sludge) obtained as a sediment by leaving it standing in a sedimentation tank; excavated soil, soft soil, and the like. And the above-mentioned hydrous soil is JIS A 1
203 (water content test method), "(water
(g) / solid content (g)) × 100 ”, the water content ratio is 20% to
It is preferably within the range of 250%. Water content (hereinafter referred to as water content) is used for water-containing soil with a water content ratio exceeding 250%.
Therefore, the amount of the particle-forming agent must be used in a large amount, and the cost of the particle-forming agent becomes high, which is not preferable. Incidentally, the water-containing soil having a large amount of water may be subjected to solid-liquid separation again to reduce the amount of water. The source of the water-containing soil is not limited to the above examples. Furthermore, the water-containing soil may contain bentonite and the like in addition to clay and silt.

The water glass according to the present invention may be any of No. 1 water glass, No. 2 water glass, No. 3 water glass, and a mixture thereof, and is not particularly limited. The amount of the above-mentioned water glass used with respect to 100 parts by weight of the water-containing soil is preferably in the range of 0.2 parts by weight to 30 parts by weight. If the amount of water glass used is less than 0.2 parts by weight, it will not be possible to make the particles into fine particles, which is not preferable.
Further, even if the amount of water glass used is more than 30 parts by weight, the effect is almost the same as when it is used within the above range. Therefore, the water glass used in excess is wasted, which is not preferable.

The acidic substance according to the present invention may be any substance capable of neutralizing water glass, for example, a substance which itself exhibits acidity; a substance containing an acidic group; And the like. Specific examples of the acidic substance include relatively low molecular weight organic acids such as acetic acid and citric acid, and partial salts thereof; inorganic acids such as sulfuric acid and hydrochloric acid; glyoxal which produces acetic acid by hydrolysis; Examples thereof include, but are not particularly limited to, a relatively high molecular weight organic acid having a carboxyl group and a partial salt thereof obtained by (co) polymerizing acrylic acid, maleic acid and the like. Of these, relatively high molecular weight organic acids containing carboxyl groups and /
Or a partial salt thereof is more preferable, and polyacrylic acid and / or a partial salt thereof is particularly preferable.

The above-mentioned polyacrylic acid and / or its partial salt also includes a copolymer containing acrylic acid as a main component. The copolymerization component when polyacrylic acid is a copolymer is not particularly limited. Examples of the partial salt of polyacrylic acid include alkali metal salts such as sodium salt and potassium salt; ammonium salt; amine salt and the like, but are not particularly limited.

The neutralization rate of polyacrylic acid is not particularly limited, but is preferably 70% or less, more preferably 40% or less, and further preferably 20% or less. When the neutralization rate of polyacrylic acid exceeds 70%, it may not be possible to make the particulate material into fine particles. Of the polyacrylic acid and / or polyacrylate having a neutralization ratio of 70% or less, polyacrylic acid which is a complete acid type is most preferable.

The weight average molecular weight (Mw) of polyacrylic acid and / or its partial salt (hereinafter referred to as polyacrylic acid (salt)) is preferably in the range of 50,000 to 5,000,000,
The range of 00,000 to 1,500,000 is more preferable. And
Weight average molecular weight (Mw) is 500,000-1,200,000, and
Most preferred is polyacrylic acid (salt) having a neutralization ratio of 40% or less. Weight average molecular weight (Mw) of polyacrylic acid (salt) is 50,0
If it is less than 00, it is not possible to make the particles finer, which is not preferable. If the weight average molecular weight (Mw) of the polyacrylic acid (salt) exceeds 5,000,000, mixing the particles of polyacrylic acid (salt) with water-containing soil will result in a thickening effect and the two must be mixed uniformly. In addition, mixing polyacrylic acid (salt) in the form of an aqueous solution with water-containing soil is not preferred because the viscosity of the aqueous solution becomes too high and the two cannot be uniformly mixed.

When the polyacrylic acid (salt) is used in the form of an aqueous solution, the viscosity of the aqueous solution is preferably in the range of 5 cP (centipoise) to 5,000 cP, more preferably in the range of 10 cP to 1,000 cP. When the viscosity of the aqueous solution is less than 5 cP, it is not preferable because the granulated material cannot be made finer. On the other hand, if the viscosity of the aqueous solution exceeds 5,000 cP, the aqueous solution cannot be uniformly mixed with the hydrous soil, and the granules cannot be made finer, which is not preferable. Incidentally, depending on the weight average molecular weight (Mw) of the polyacrylic acid (salt) to be used, in order to set the viscosity of the aqueous solution within the above range, the concentration of the aqueous solution is set to 0.5.
In the range of 50% to 50% by weight, preferably 1.0 to 15%
It may be set within the range of weight%.

When polyacrylic acid (salt) is used as particles, the particle size of the particles is preferably in the range of 0.01 mm to 2 mm, more preferably in the range of 0.02 mm to 1 mm, and even more preferably 0.1.
More preferably, it is in the range of 05 mm to 0.5 mm. Particle size 2mm
If it exceeds, the amount used must be increased in order to make the granules finer, resulting in an increase in cost, which is not preferable. Further, when the particle size is less than 0.01 mm, dust is likely to be generated when handling polyacrylic acid (salt), and the polyacrylic acid (salt) is likely to absorb moisture. Therefore, workability is reduced, and when added to hydrous soil, flour is generated and the amount of use must be increased in order to reduce the grain size.

The amount of the acidic substance used with respect to 100 parts by weight of the water-containing soil depends on the kind of the acidic substance used, but is preferably within the range of 0.1 parts by weight to 10 parts by weight. When the amount of the acidic substance used is less than 0.1 part by weight, it is not possible to make the particles into fine particles, which is not preferable. Further, even if the amount of the acidic substance used is more than 10 parts by weight, the effect is almost the same as when used in the above range. Therefore, an excessively used acidic substance is wasted, which is not preferable. still,
The above-mentioned amount used when the acidic substance is used in the state of an aqueous solution indicates the amount (pure content) of the acidic substance in the aqueous solution.

The polyvalent metal compound according to the present invention includes
A water-soluble compound is preferable, and specifically, for example, calcium chloride (anhydride, dihydrate, hexahydrate), calcium acetate (anhydrous salt, monohydrate, dihydrate), aluminum sulfate, aluminum chloride, Examples of the compound include ferrous chloride, ferric chloride, and polyaluminum chloride, but are not particularly limited. Of these, calcium chloride / dihydrate is particularly preferable.

The amount of the polyvalent metal compound used with respect to 100 parts by weight of the water-containing soil depends on the kind of the polyvalent metal compound or the acidic substance used, but is preferably within the range of 0.1 parts by weight to 10 parts by weight. When the amount of the polyvalent metal compound used is less than 0.1 part by weight, it is not possible to make the particles into fine particles, which is not preferable. Also, the amount of polyvalent metal compound used should be 10
Even if the amount is more than the weight part, the effect is almost the same as that in the case of using within the above range. Therefore, the polyvalent metal compound used in excess is wasted, which is not preferable.

Examples of the hydraulic material according to the present invention include, but are not limited to, cement, quick lime, gypsum, and mixtures thereof. Of these, cement is more preferable.

As the above-mentioned cement, various known cements can be adopted. Specific examples of the cement include Portland cement such as ordinary Portland cement, early-strength Portland cement, and ultra-high-strength Portland cement; blast furnace cement; alumina cement; calcium cement; and fly ash cement. However, there is no particular limitation.
These cements may use only one kind,
Two or more of them may be used by appropriately mixing.

The amount of the above-mentioned hydraulic substance used with respect to 100 parts by weight of the water-containing soil depends on the type of the hydraulic substance or acidic substance used, but is preferably within the range of 1 part by weight to 35 parts by weight.
More preferably, it is within the range of 25 parts by weight to 25 parts by weight. If the amount of the hydraulic material used is less than 1 part by weight, the strength of the particulate material (described later) becomes insufficient, which is not preferable. Further, even when the amount of the hydraulic substance used is more than 35 parts by weight, the effect is almost the same as when the hydraulic substance is used within the above range. Therefore, the hydraulic substance used in excess is wasted, which is not preferable.

As described above, the particle forming agent according to the present invention comprises water glass, an acidic substance, a hydraulic substance, and, if necessary, a polyvalent metal compound. Next, a particle-forming method for particle-forming the water-containing soil using the above-mentioned particle-forming agent will be described below.

First, the water glass, the acidic substance, and, if necessary, the polyvalent metal compound are mixed with the water-containing soil. As a mixer used when mixing water glass, an acidic substance and a polyvalent metal compound in a water-containing soil, a device capable of stirring and mixing these mixtures without kneading is preferable, for example, a so-called planetary motion type. Alternatively, a biaxial type device in which the stirring blade is formed in a rod shape, a fishhook shape, or the like is suitable so that the mixture can be stirred while applying a shearing force. In other words, the stirring blade has a shape that expands in a direction as perpendicular as possible to the moving direction of the mixture that moves by stirring and mixing, and can suppress coarsening of the particle diameter due to kneading, and also to the stirring blade and the inner wall of the device. It is desirable because it can prevent the mixture from adhering.

As such an apparatus, for example, a planetary forced mixer (planetary mixer) and the like can be mentioned. By using the mixer described above to mix hydrous soil, water glass, acidic substances and polyvalent metal compounds, and by using the shearing force generated by the stirring blade, the mixture has a particle size of 0.1 mm.
It can be finely pulverized (granulated) into particles in the range of ˜50 mm, preferably in the range of 0.3 mm to 10 mm. The method of mixing the water-containing soil, the water glass, the acidic substance and the polyvalent metal compound, the order of mixing and the like are not particularly limited.

Next, a hydraulic substance is added to and mixed with the obtained granules. The mixer used for mixing the two is not particularly limited, but an apparatus capable of stirring and mixing the mixture of both without kneading is preferable. When mixing using such a mixer, the shearing force is not applied as much as the mixing method when mixing the water-containing soil and water glass, and the rotation speed of the stirring blade is compared. It is preferable to agitate so that the hydraulic substance adheres (sprays) to the surface of the granulated product while minimizing the amount. As a result, a finely granulated product in which the hydraulic substance is substantially uniformly attached to the surface of the granulated product is obtained. A part of the hydraulic substance may enter the inside of the granular material. Further, the method of mixing the granular material and the hydraulic substance is not particularly limited.

Then, the obtained finely granulated product is treated at room temperature for 3 minutes.
Leave for about 7 to 7 days. As a result, the hydraulic substance is cured, and the finely granulated product, that is, the granulated product has a predetermined (sufficient) strength. The strength of the particles is JIS A
9 measured according to 1211 (CBR test method)
0% Modified CBR (California Bearing Ratio) value is 5% ~
95%. The strength can be arbitrarily adjusted by the viscosity and the water content ratio of the water-containing soil, the addition amount of water glass, the acidic substance, the polyvalent metal compound, the cement, or the like. still,
The 90% modified CBR value indicates that the higher the value, the higher the strength.

Since the particle product obtained as described above has a predetermined particle size and sufficient strength, it can be used as a resource such as a substitute for sand without crushing or sieving. Can be reused. In other words, in civil engineering work that requires backfilling of the excavation hole, backfilling can be performed using the granulated material without separately preparing sand or the like. In addition, the above-mentioned particulate matter is a backfill material when backfilling a buried pipe or structure, a blocking layer material such as artificial sand, a vegetation base material for spraying the paste surface to process the paste surface, a soil improving material. It can be used as a roadbed material, a water retaining material, a water permeable material, a water quality improving material, and the like. Further, since the particulate matter can be reused, environmental protection, resource saving, and life extension of the disposal site can be achieved, and the disposal cost of the water-containing soil can be reduced.

[0030]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited thereto.

[Example 1] A water-containing soil was obtained by dewatering and pressing muddy water generated by excavation work employing the muddy water shield method. The water content of the hydrous soil was 84%. Then, as the mixer, a planetary mixer (M-20 type manufactured by Civil Engineering Testing Machines Co., Ltd.) equipped with hook-shaped stirring blades was used.

The mixer was charged with 5 kg of the above-mentioned water-containing soil,
While stirring the water-containing soil at 160 rpm, No. 3 water glass 50
g, weight average molecular weight (Mw) 800,000, neutralization rate 0%,
Add 25 g of particulate polyacrylic acid (acidic substance) with a particle size within the range of 0.05 mm to 0.25 mm and 25 g of calcium chloride / dihydrate (polyvalent metal compound) little by little to the water-containing soil.
Mix and atomize. The ratio of No. 3 water glass to the water-containing soil is 1.0% by weight. The ratio of polyacrylic acid to hydrous soil is 0.5% by weight. The ratio of calcium chloride / dihydrate to hydrous soil is 0.5% by weight.

Next, while stirring the obtained granules at 160 rpm, Portland cement 7 as a hydraulic substance was prepared.
50 g was added and mixed little by little to the granules. The proportion of Portland cement to the water-containing soil is 15% by weight.

By the above operation, a finely granulated product in which Portland cement was almost uniformly adhered to the surface of the granulated product was obtained. The obtained fine granules had a particle diameter in the range of 0.3 mm to 15 mm and an average particle diameter of 1 mm. Thereafter, the granulated product was allowed to stand at room temperature for 7 days. As a result, a particle product was obtained. The 90% modified CBR value of the granules was 30%. Table 1 shows the main grain-refining conditions and the grain size of the grain-refined product.

[Example 2] A finely divided product was obtained by the same procedure as in Example 1 except that calcium chloride / dihydrate was not used. The obtained finely divided product had a particle size in the range of 0.5 mm to 30 mm and an average particle size of 2 mm. Also, 90% of the particles are corrected
The CBR value was 12%. Main grain refining conditions, and
Table 1 shows the particle size and the like of the finely granulated product.

Example 3 In place of the calcium chloride dihydrate used in Example 1, calcium acetate dihydrate as a polyvalent metal compound was used in an amount of 0.5% by weight based on the water-containing soil. By performing the same operation as in Example 1, a finely granulated product was obtained. The obtained finely divided product had a particle size in the range of 0.5 mm to 20 mm and an average particle size of 2 mm. In addition, 90% modified CBR value of granules is 25%
Met. Table 1 shows the main grain-refining conditions and the grain size of the grain-refined product.

Example 4 Instead of the polyacrylic acid used in Example 1, the weight average molecular weight (Mw) was 1,400,0.
00, the same as in Example 1 except that 0.5% by weight of particulate polyacrylic acid having a neutralization rate of 0% and a particle diameter within the range of 0.1 mm to 0.45 mm was used with respect to the water-containing soil. By performing the operation, a finely granulated product was obtained. The obtained fine granules have a particle size in the range of 1.0 mm to 25 mm and an average particle size of 3 mm.
Met. Also, the 90% modified CBR value of the granulated product is 28
%Met. Table 2 shows the main fine-graining conditions and the grain size of the fine-grained product.

Example 5 Instead of the polyacrylic acid used in Example 1, the weight average molecular weight (Mw) was 800,00.
0, polyacrylic acid (sodium) with a neutralization rate of 40%
The same operation as in Example 1 was carried out except that 0.5% by weight of the 5% by weight aqueous solution of 5% by weight was used to obtain a finely granulated product. The viscosity of the above aqueous solution was 350 cP. The obtained fine granules had a particle size in the range of 0.3 mm to 50 mm and an average particle size of 2 mm. The 90% -corrected CBR value of the particles was 22%. Table 2 shows the main fine-graining conditions and the grain size of the fine-grained product.

Example 6 Instead of the polyacrylic acid used in Example 1, the weight average molecular weight (Mw) was 800,00.
A finely divided product was obtained by performing the same operation as in Example 1 except that a 5 wt% aqueous solution of polyacrylic acid having a neutralization rate of 0% was used in an amount of 0.5 wt% with respect to the water-containing soil. Obtained. The viscosity of the aqueous solution was 40 cP. The obtained fine granules had a particle diameter in the range of 0.5 mm to 10 mm and an average particle diameter of 1 mm. Also, 90% modified CB of particles
The R. value was 34%. Table 2 shows the main fine-graining conditions and the grain size of the fine-grained product.

Example 7 Into the same mixer as in Example 1, 5 kg of water-containing soil having a water content of 178% was charged, and while stirring the water-containing soil at 160 rpm, 50 g of No. 3 water glass.
And 40% by weight aqueous solution of glyoxal as an acidic substance were gradually added to and mixed with the water-containing soil to form fine particles. The ratio of No. 3 water glass to the water-containing soil is 1.0% by weight. The ratio of glyoxal to hydrous soil is 0.8% by weight.

Next, while stirring the obtained granules at 160 rpm, 750 g of Portland cement was gradually added to and mixed with the granules. The proportion of Portland cement to the water-containing soil is 15% by weight.

By the above operation, a finely granulated product in which Portland cement was almost uniformly attached to the surface of the granulated product was obtained. The obtained finely divided product had a particle size in the range of 0.5 mm to 30 mm and an average particle size of 2 mm. Thereafter, the granulated product was allowed to stand at room temperature for 7 days. As a result, a particle product was obtained. The 90% modified CBR value of the granules was 12%. Table 3 shows the main fine-graining conditions and the grain size of the fine-grained product.

Example 8 The same mixer as that of Example 1 was charged with 5 kg of water-containing soil having a water content of 200%, and 500 g of No. 3 water glass while stirring the water-containing soil at 160 rpm.
And 250 g of particulate polyacrylic acid having a weight average molecular weight (Mw) of 800,000, a neutralization ratio of 0%, and a particle size of 0.05 mm to 0.25 mm, and 250 g of calcium chloride / dihydrate. It was added and mixed little by little to the soil to make it finer. The ratio of No. 3 water glass to the water-containing soil is 10.0% by weight. The ratio of polyacrylic acid to the water-containing soil is 5% by weight. The ratio of calcium chloride / dihydrate to the water-containing soil is 5% by weight.

Next, 750 g of Portland cement was added to and mixed with the granules little by little while stirring the granules obtained at 160 rpm. The proportion of Portland cement to the water-containing soil is 15% by weight.

Fine granules were obtained by the above operation. The resulting finely granulated product had a particle diameter within the range of 0.5 mm to 25 mm and an average particle diameter of 1 mm. In addition, 90
The% modified CBR value was 34%. Table 3 shows the main fine-graining conditions and the grain size of the fine-grained product.

Example 9 Instead of the polyacrylic acid used in Example 1, the weight average molecular weight (Mw) was 800,00.
0, the neutralization rate was 40%, the procedure of Example 1 except that 0.5% by weight of particulate polyacrylic acid (sodium) having a particle diameter within the range of 0.05 mm to 0.25 mm was used with respect to the water-containing soil. By performing the same operation as above, a fine-grained product was obtained. The obtained fine granules had a particle diameter in the range of 0.5 mm to 20 mm and an average particle diameter of 1 mm. Also, 90% of the particles are corrected
The CBR value was 28%. Main grain refining conditions, and
Table 3 shows the particle size of the finely granulated product.

Example 10 Instead of the polyacrylic acid used in Example 1, the weight average molecular weight (Mw) was 800,0.
00, 0.5% by weight of a 10% by weight aqueous solution of polyacrylic acid with a neutralization rate of 0% was used for the hydrous soil, and the amount of Portland cement used for the hydrous soil was 15% by weight.
Was changed to 3% by weight, and the same operation as in Example 1 was performed to obtain a finely granulated product. The viscosity of the aqueous solution was 600 cP. The obtained fine granules had a particle diameter in the range of 0.5 mm to 8 mm and an average particle diameter of 1 mm. In addition, 90% modified CBR value of granules is 9%
Met. Table 4 shows the main fine-graining conditions and the grain size of the fine-grained product.

Example 11 In place of the water-containing soil used in Example 1, 5 kg of water-containing soil having a water content ratio of 50% was used, and instead of the polyacrylic acid used in the same Example, the weight average molecular weight (Mw ) Is 800,000, and the neutralization rate is 0%.
A finely granulated product was obtained by performing the same operation as in Example 1 except that 0.5% by weight was used and the amount of Portland cement used with respect to the water-containing soil was changed from 15% by weight to 25% by weight. The viscosity of the aqueous solution was 600 cP. The obtained fine granules had a particle diameter in the range of 0.5 mm to 5 mm and an average particle diameter of 1 mm. The 90% -corrected CBR value of the particles was 75%. Table 4 shows the main fine-graining conditions and the grain size of the fine-grained product.

Comparative Example 1 Instead of the polyacrylic acid used in Example 1, a weight average molecular weight (Mw) was 30,000,
0.5% by weight of particulate polyacrylic acid with a neutralization rate of 0% and a particle size within the range of 0.05 mm to 0.25 mm with respect to the water-containing soil
The same operation as in Example 1 was performed except that it was used.
However, a finely divided product could not be obtained. Table 4 shows the main conditions for grain refining.

Comparative Example 2 Instead of the polyacrylic acid used in Example 1, the weight average molecular weight (Mw) was 800,00.
0, the neutralization rate was 100%, the same as in Example 1 except that 0.5% by weight of particulate sodium polyacrylate having a particle diameter in the range of 0.05 mm to 0.25 mm was used with respect to the water-containing soil. The operation was performed. However, a finely divided product could not be obtained. Table 5 shows the main grain refining conditions.

Comparative Example 3 Instead of the polyacrylic acid used in Example 1, the weight average molecular weight (Mw) was 800,00.
The same operation as in Example 1 was carried out except that 0% and 0.5% by weight of a 5% by weight aqueous solution of sodium polyacrylate having a neutralization rate of 100% were used with respect to the water-containing soil. The viscosity of the aqueous solution was 600 cP. However, a finely divided product could not be obtained. Table 5 shows the main grain refining conditions.

[Comparative Example 4] Instead of the water-containing soil used in Example 1, 5 kg of water-containing soil having a water content ratio of 300% was used, and the amount of No. 3 water glass used for the water-containing soil was changed.
Change the amount of polyacrylic acid used from 1.0% to 30% by weight.
Example except that the amount of calcium chloride / dihydrate used was changed from 0.5% by weight to 10% by weight, and the amount of Portland cement used was changed from 15% by weight to 35% by weight. The same operation as the operation of 1 was performed. However, a finely divided product could not be obtained. Table 5 shows the main grain refining conditions.

[0053]

[Table 1]

[0054]

[Table 2]

[0055]

[Table 3]

[0056]

[Table 4]

[0057]

[Table 5]

[0058]

As described above, the particle-forming agent for hydrous soil according to claim 1 of the present invention is composed of water glass, an acidic substance, and a hydraulic substance. As described above, the particulate agent for hydrous soil according to claim 2 of the present invention is configured such that the acidic substance is a polycarboxylic acid and / or a partial salt thereof. The particle agent for hydrous soil according to claim 3 of the present invention,
As described above, the polyvalent metal compound is further included.

As a result, the hydrous soil after granulation is refined into particles having a predetermined particle size and sufficient strength, so that the hydrous soil is effective as a resource such as a substitute for sand. The effect is that it can be utilized (reused) for. In addition, since the particulate matter can be reused, environmental conservation, resource saving, and life extension of the disposal site can be achieved, and at the same time, the disposal cost of the water-containing soil can be reduced.

Further, the method for granulating hydrous soil according to claim 4 of the present invention is as described above, in which water glass and an acidic substance are mixed with hydrous soil, the mixture is granulated, and then the granules are formed. This is a method of adding a hydraulic substance. Claim 5 of the present invention
The method for particle formation of the water-containing soil described above, as described above, mixes water glass, an acidic substance, and a polyvalent metal compound in the water-containing soil,
It is a method of granulating the mixture and then adding a hydraulic substance to the granulated product.

As a result, the hydrous soil after granulation can be refined into particles having a predetermined particle size and sufficient strength, so that the hydrous soil can be used as a resource such as a substitute for sand. As an effect, it can be effectively used (reused). In addition, since the particulate matter can be reused, environmental conservation, resource saving, and life extension of the disposal site can be achieved, and at the same time, the disposal cost of the water-containing soil can be reduced.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location E02F 7/00 E02F 7/00 D E21D 9/12 E21D 9/12 Z // C09K 103: 00 (72) Invention Naoyuki Shirane, 1-1-1 Koraibashi, Chuo-ku, Osaka-shi, Osaka

Claims (5)

[Claims] 1. A particle agent for hydrous soil, comprising water glass, an acidic substance, and a hydraulic substance. 2. The particle agent for hydrous soil according to claim 1, wherein the acidic substance is a polycarboxylic acid and / or a partial salt thereof. 3. The particulate agent for hydrous soil according to claim 1, further comprising a polyvalent metal compound. 4. A method for granulating water-containing soil, which comprises mixing water glass and an acidic substance into water-containing soil, granulating the mixture, and then adding a hydraulic substance to the granules. 5. Granulation of a water-containing soil, which comprises mixing water glass, an acidic substance and a polyvalent metal compound in the water-containing soil, granulating the mixture, and then adding a hydraulic substance to the granulated product. Method.