JP2001303056A - Soil texture and soil conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To artificially reproduce a mechanism that a plant release the electric charge by the adsorbed and adherent water for a short time. SOLUTION: The soil texture and soil conditioner includes at inorganic metal salts, for example, sodium chloride, potassium chloride, magnesium chloride and calcium chloride in addition to citric acid and manifests the function to weaken the electric charge of the adsorbed and adherent water on the soil particles, the function to convert the adsorbed and adherent water having weakened electric charge to free water and the function to form and develop needle crystals. The soil modified with the soil conditioner according to this invention solidifies as the soil particles construct the card-house structure. In the resultant solid soil, the space in the card-house structure forms ultramicroporus pores of the angstrom level having spaces communicating to each other thereby giving continuously porous bodies of markedly increased water permeability and air permeability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for controlling the soil quality of a target soil.
The present invention relates to a soil conditioner, particularly a soil condition / soil conditioner capable of forming a stable solidified ground irrespective of the target soil and the type and properties of the soil.

[0002]

2. Description of the Related Art It can be said that soil is a mixture of small particles containing silica and aluminum as main components, other trace elements, and humic substances mixed therein. Soil changes to various different physical properties, such as sludge and slurry, depending on the change in the amount of water in the soil. The water contained in the soil, the water present on the solid surface such as soil particles and the gaps formed by the soil particles is called soil water. Soil water includes water that cannot move freely due to binding with soil particles (adsorbed water), water that is maintained by capillary force (adhered water), and water that can move freely by gravity (free water). Depending on the condition, there is a difference in the utilization of plants and the difficulty of water transfer.

When soil is hardened using cement, soil having a small humus content and a large grain size, such as masa soil and mountain soil, is solidified by directly mixing the soil and the cement. However, there is a problem that soil containing a large amount of humus, small-particle soil, and oil-containing soil cannot be hardened easily with cement alone.

[0004]

The humus is one of the factors that hinder the stable solidification of cement. Humus is a kind of sugar, and the reason why it does not harden when mixed with cement in these soils is for the same reason that adding a little sugar to ready-mixed concrete does not harden. The humus that has dissolved into the surface of the soil particles in the soil is called humic acid and is a polymer compound that is undergoing decomposition.

[0005] Since humus is a substance that is undergoing decomposition,
Although the properties are not constant, it dissolves in the attached water around the soil particles and acts to prevent direct contact between calcium ions, which should be the main reactant of the cement setting reaction, and the soil particles. It also has a negative effect on the setting reaction and hinders the solidification, making it impossible to stably solidify the cement.

[0006] In addition, the fact that the soil particles are as small as clay particles is one of the factors that hinder the stable solidification of cement. The other reason that the solidification of cement is hindered is that the smaller the particle size of the soil particles is, the larger the specific surface area of the particles is, and the electric force is exerted. This is because calcium ions cannot enter between the particles. Thus, it is difficult to firmly solidify soil containing humic substances or soil having a small particle size such as clay particles.

On the other hand, the adsorption force acting between the fine particles of the soil and the soil water, especially the adsorbed water, is very strong, and is 2000 kgf / cm.
It is said that it is adsorbed with about ² forces. For example,
Loams and the like contain about 300-700 l of water in 1 m ³ of soil, but this water is not used in a desert-like dry state for a long period of time, or by a method of forcibly evaporating water by heat. In addition, it is impossible to mechanically reduce the water content per 1 m ³ to 300 l or less.

[0008] Therefore, it can be said that solving the problem of what kind of measures should be taken to weaken the adsorptivity of soil water is the most important for solidifying the soil fine particles with cement. By the way, plants have a mechanism that elutes citric acid from hair roots, weakens the charge of adsorbed water and attached water, and converts them into free water that can move, thereby absorbing water. However, the above mechanism is for taking in the amount of water necessary for the survival and growth of plants from the ground over time, and this system cannot be used industrially as it is.

It is an object of the present invention to provide a method for artificially reproducing the above mechanism of weakening the charge of adsorbed water and attached water possessed by a plant in a short period of time so that calcium ions can be brought into direct contact with soil particles. It is to provide a soil conditioner.

[0010]

In order to achieve the above object, the soil / soil conditioner according to the present invention has a function of weakening the charge of adsorbed water and attached water on soil particles, a function of weakening the charge of adsorbed water, A function to change the attached water to free water,
It contains an active ingredient that exhibits a function of forming and generating needle-like crystals.

The function of weakening the charge of the adsorbed water and the adhering water of the soil particles is such that an aqueous solution of the active ingredient exhibiting the above function generates a sufficient negative charge by the charge reduction caused in the water molecule, and the absorbed water is removed. Applying enough pressure to the positive charge of the layer, this layer of water breaks through the static potential barrier,
This weakens the charge that was preventing Ca ⁺⁺ from entering,
This is a function to spread the dissolved components of the cement, such as a ^++, between the soil particles and to exert the effect of ejecting water molecules around the soil particles out of the ion group.

The function of changing the weakly charged adsorbed water and attached water to free water is such that the cations in the aqueous solution of the active ingredient and the cations in the cement liquid phase exhibiting the above functions are deposited on the surface of the soil particles. It has the function of initiating the coagulation reaction and thinning the water film on the particle surface that is chemically bound water.

In addition, the weakly charged adsorbed water and attached water are automatically removed.
The function to change to free water is Ca in cement.⁺⁺The particle table
Exchange with surface ions to change the charged state of the soil particle surface
And agglomerate the clay particles to form aggregates.
Rica, colloidal alumina Ca ⁺⁺And react with calcium silicate
Cium (4Ca-AlO)_Three, 13H_TwoO), Ghale Night
Hydrate (2CaO_Two, Al_TwoO_Three・ SiO_Two・ 6H_TwoO)
Is included.

The function of forming and generating needle-like crystals is as follows. A hydrate such as calcium silicate, which is a hydration reaction of cement, generates embryo seeds which serve as a basis for bridging between soil particles. It produces and grows it, loses the fluidity of the cement paste, and has the function of connecting the soil particles with needle-like crystals (ettringite) generated between the particles.

The above functions also change the physical properties of the soil particle interface even in soil with a lot of humus, increase the stability of the soil, and react Si and Al, in which the constituents of the soil particles are eluted, with Ca (OH) _2. In addition, it promotes the formation of tobermorite hydrate and lime aluminate hydrate, and has a function of firmly uniting the soil particles.

[0016] Further, the present invention comprises inorganic metal salts as a main component, eliminates insufficient strength, makes a long-term stable ground, and makes it possible to construct a ground that is almost permanent.

Further, as an active ingredient exhibiting the above functions, at least inorganic metal salts such as sodium chloride, potassium chloride, magnesium chloride and calcium chloride are contained in addition to citric acid.

In addition to citric acid (1-5%), sodium chloride (1
5-25%), potassium chloride (20-35%), magnesium chloride (15-25%), calcium chloride,
It contains an active adjuvant (5 to 20%) containing calcium phosphate, sodium sulfate and the like.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. The soil / soil improver according to the present invention has an active ingredient added to the soil in the form of an aqueous solution, and has a function of weakening the charge of adsorbed water and attached water of the soil particles, and a function of freely removing the adsorbed water and attached water of further reduced charge. The function of changing into water and the function of forming and generating needle-like crystals by acting on cement are sequentially realized.

As an active ingredient exhibiting the above function, at least an inorganic metal salt such as sodium chloride, potassium chloride, magnesium chloride and calcium chloride is contained in addition to citric acid. Above all, citric acid (1-5%), sodium chloride (15-25%), potassium chloride (20-35%), magnesium chloride (15-
25%), calcium chloride (5 to 15%), calcium phosphate, sodium sulfate and other active adjuvants (5 to 15%)
20%), the above function is effectively exhibited. The contents of the above functions will be described with reference to FIG.

FIG. 1 (a) shows a state in which humic acid-containing adsorbed water and adhering water 2 adhere to the soil particles 1 at a thickness of about 0.5 μm. FIG. 1B shows a state in which a 10% aqueous solution 3 of the active ingredient of the soil / soil improving agent according to the present invention is added to the soil particles 1. First, the function of the soil / soil improver of the present invention to weaken the charge of the adsorbed water / adhered water 2 on the soil particles and the function of changing the weakly charged adsorbed water / adhered water to free water are sequentially exhibited. From 1, the adsorbed water / adhered water 2 is released as free water 2a.

When the adsorbed water / adhered water is released from the soil particles 1, the soil particles 1 are in a so-called naked state,
Direct bonding of the cement to the surface of the cement. When the cement 4 added as a paste can be bonded to the soil particles, as shown in FIG.
⁺⁺ (Calcium ion) directly and strongly binds to the surface of the soil particles 1.

Since the earth particles are generally charged negatively (-), they easily and electrically couple with the positive (+) Ca ions of the cement. In FIG. 1 (d), when the soil and soil conditioner according to the present invention and the soil are mixed with stirring, the cement paste solidifies on the surface of the soil particles 1 with the lapse of time, and the distance between the soil particles 1 is increased. The needle-like crystal 5 is generated so as to fill the gap, and the growth of the needle-like crystal 5 reaches a peak in about 28 days (4 weeks). This crystal is called ettringite.

FIG. 1 (e) shows that the needle particles 5
Schematically shows the structure of the solidified body 6 connected to each other. The solidified body 6 is a structure having microporous pores 7 communicating with each other in a tissue, and shows viscoelasticity. The solidified body 6 becomes a stable solidified ground by being compressed, but the microporous solidified body 6 bound by the needle-like crystals 5 (ettringite) is formed by the continuous pores 7 to provide air permeability and water permeability of the entire tissue. Because of its improved properties and water retention, it becomes a soil suitable for the growth of aerobic bacteria and a medium suitable for the growth of plants.

The function of the active ingredient of the soil / soil improver according to the present invention will be described below. As described above, humus and the like are decomposed and contained in large amounts in dissolved form in soil moisture. Humic substances are humic acids, and humic acid molecules have polyfinol-type aromatics. At present, compounds and individual chains contain nitrogen.

The structure of humic acid / micellar colloid is composed of inorganic humic acid as a nucleus, into which anions and cations are atomized or absorbed by van der Waals force to form an aggregate of molecules or atomic groups. Because the cations and anions also have very strong power.

In other words, around the soil particles, cations,
Anions are adsorbed as a group of ions, so even if you try to improve and solidify the soil particles with cement,
As described above, the calcium cations and the like in the cement liquid phase cannot directly contact the soil particles, and the solidification of the soil particles is inhibited.

When the soil quality / soil improving agent according to the present invention is added to the soil containing such soil particles, the function of weakening the charge of the adsorbed water and the attached water of the soil particles is to inhibit the binding of the soil particles. The dipole moment of the water molecule containing humic acid is reduced, and as a result, the function of changing the weakly charged adsorbed water / adhered water to free water is developed. As shown in FIG. Water is decomposed.

That is, the adsorbed water and the adhering water are split into hydrogen ions and hydroxyl groups which have been integrated and absorbed, and the hydrogen ions and hydroxyl groups are separated into those which generate hydroxyl ions and hydronium and those which are positively or negatively charged. You do it. Hydroxyl ions, separated by further releases O _2.

In FIG. 1 (c), the surface charge of the clay mineral is always negative, and the cation and the cement liquid in the aqueous solution of the active ingredient of the soil and soil conditioner according to the present invention, which are positively charged ions. The cations in the phase initiate a coagulation reaction on the soil particle surface, and the water film on the particle surface, which is chemically bound water, depends on the various components contained in the aqueous solution of the active ingredient of the soil and soil conditioner according to the present invention. It becomes thin.

The reaction is as follows. That is, (H) ⁺ + (H) ⁻ → H ₂ , new water molecules of H ₂ + (OH) ⁻ are formed, and water on the particle surface is liquefied, thereby removing the water film on the particle surface. To expose the particle surface. The negatively charged, or negatively charged, hydroxyl ions of the hydronium ions usually combine with the positively charged metal ions with ionized water on the surface of the soil particles.

The aqueous solution of the active ingredient of the soil / soil conditioner according to the present invention generates a sufficient negative charge by the charge reduction caused in the water molecule, and applies a sufficient pressure to the plus of the absorbed water layer. Layers can break through the static potential barrier. Thus, as an expression of the function of weakening the charging of adsorbed water, water adhering soil particles, weakened charged that prevented the entry of Ca ^++, dissolved components of the cement Ca ⁺⁺ such as spreads between soil particles, Water molecules around the soil particles also have the effect of drawing out ions.

As a result, the gap between the soil particles is reduced,
Acts on cement as potential drops to form needle-like crystals.
The generation function is expressed and the soil particles are aggregated, Ca ⁺⁺
Penetrate into the gaps between the soil particles and connect the fine soil particles. At the same time, an alkaline liquid phase having a pH of 10 or more is created, and hydrates such as calcium silicate, which is a hydration reaction of cement, generate embryo seeds which serve as a bridge between soil particles, as shown in FIG. 1 (d). A needle-like crystal 5 is created, which grows rapidly.

As a result of the growth of the acicular crystals 5, the fluidity of the cement paste is lost, and the acicular crystals (etringite) 5 generated between the particles connect the soil particles, thereby obtaining the structure shown in FIG. Thus, continuous microporous pores 7 are formed, and the solidified soil has the same adsorptivity as activated carbon.

According to the present invention, Ca ^{++ that} has progressed to the setting reaction is removed by removing the one that inhibits the setting reaction of the cement, and when the Ca ⁺⁺ hydrates, an extremely fine gel grows from the particle surface and becomes entangled intricately. Connect between particles. This gel grows by the pozzolanic reaction.

In the present invention, ion exchange (cement
Ca in⁺⁺Exchange with ions on the particle surface,
The charge state changes and the clay particles aggregate and aggregate.
A) After that, as the material age progresses, colloidal silica and colloid
Lumina is Ca⁺⁺Reacts with calcium silicate (4Ca · A
10_Three, 13H_TwoO), hydrate of Gehlenite (2CaO
_Two, Al_TwoO_Three・ SiO_Two・ 6H_TwoO).

This reaction lasts for a long period of time, and serves as a binder to stably solidify the soil. With the soil and soil improver according to the present invention, the use of lime removes defects such as insufficient strength of the lime treatment method, elution of calcium ions, etc., measures the strength, and removes moisture in the soft ground,
It is possible to improve the trafficability of the unmovable ground so that it can travel in a short time.

The above function according to the present invention is exerted by containing at least citric acid in an inorganic metal salt such as sodium chloride, potassium chloride, magnesium chloride and calcium chloride as an active ingredient exhibiting the above function. Sodium chloride (NaCl), which is added as an active ingredient in addition to citric acid (1 to 5%), when the amount of addition is less than 150 g per 1 m ^{3 of} soil, penetration of calcium ions (Ca ⁺⁺ ) of cement. Poor ability, 25
If the amount is more than 0 g, not only does the penetrating power deteriorate, but also it becomes difficult to dissolve.

When potassium chloride (KCl) is added in an amount less than 200 g per 1 m ^{3 of} soil, the ability of cement to infiltrate calcium ions (Ca ⁺⁺ ) is inferior.
The effect is remarkably reduced as the amount exceeds 0 g.

Magnesium chloride (MgCl ₂ )
If it is less than 150 g with respect to m ³ , shrinkage cracks occur in the solidified body, and if it is more than 250 g, the solidified body forming the pore structure expands and breaks.

If the amount of calcium chloride (CaCl ₂ ) is less than 50 g, the strength of the solidified body cannot be promoted. On the other hand, if the amount is more than 150 g, there is a possibility that the solidified body (porous structure) may be broken due to a water breakage phenomenon. In addition, by adding calcium phosphate, sodium sulfate, and other active adjuvants (5 to 20%), the action of the active ingredient is activated, and soil and mud containing humus can be solidified in a relatively short time. .

Since the active ingredient of the soil / soil conditioner according to the present invention is mainly composed of inorganic metal salts, it is possible to eliminate insufficient strength, to create a long-term stable ground, and to build a nearly permanent ground. In addition, the soil / soil improver according to the present invention can prevent elution of calcium ions by using cement, lime and the like in combination.

According to the present invention, the properties of the soil particle interface can be changed even in soil with a lot of humic substances, the stability of the soil can be increased, and Si and Al from which the constituents of the soil particles are eluted become Ca (O).
H) reacts with ₂ to promote the formation of tobermorite hydrate and lime aluminate hydrate, and solidify soil particles.

Therefore, even a poor soil such as humus, clay or mud which is difficult to improve and solidify can be improved and solidified into a high quality soil. The soil improvement by mixing the soil / soil improver with lime according to the present invention is the normalization of the ion exchange pozzolanic reaction carbonation reaction.

The arrangement of the soil particles in the soil whose soil has been improved by the soil improving agent of the present invention forms a card house structure. The solidified body formed by the expression of the function of forming and generating needle-like crystals is such that the space in the card house structure is Å class fine pores and the space is a continuous microporous continuous pore body. The water permeability and air permeability of the solidified body are significantly improved by the fine pores.

When the soil / soil improver according to the present invention is dissolved and used as an aqueous solution having a concentration of 10%, the various components are decomposed by weakening the action of humic acid, which acts negatively, and the calcium cation ( Since Ca ⁺⁺ ) can be brought into direct contact with the surface of the soil particles, it has the property of not deteriorating or re-mudifying.

The soil / soil improver according to the present invention, soil,
The feature of mixing and stabilizing the cement is that the cement dissolving component bonded to the surface of the soil particles generates various hydrates by hydration reaction, and needle-like crystals (ettringite)
Is growing and connecting the soil particles to increase the strength while growing. This crystal takes in a large amount of water as crystal water when growing, and various substances (including harmful substances)
Has the effect of crystallizing together, so that the soil can be eluted and made harmless.

The soil treated with the soil / soil conditioner according to the present invention has a large specific surface area because it has a microbolus shape, has the same adsorptive performance as activated carbon and zeolite, and has a deodorizing effect. You can say that.
In addition, because of its good water permeability and air permeability, it is most suitable for growing aerobic bacteria, and provides soil suitable for growing plants.

[0049]

EXAMPLES As an example, a test for improving the soil properties of a riverbed was conducted as an example. This test is for dredged soil (excavated soil)
The soil / soil improving agent according to the present invention was mixed with the soil, and the mixing was carried out in a short time after the mixing to determine the composition for allowing the improved soil to be carried out and transported.

The soil / soil improver according to the present invention is characterized in that the soil of the fine particles is agglomerated and the permeability of the improved soil is remarkably improved. By the way, the characteristics of the bottom mud of rivers are that sedimentation from heavy particles (sand and gravel), and in the downstream area or in the flow with low flow velocity, fine clay particles are mainly used. It is common that humus contains a large amount of humus.

The soil / soil improver according to the present invention is capable of forming a water film adhering to the surface of soil particles by an ion exchange action.
It separates from the soil particle surface, makes the soil surface bare, and binds calcium ions in the cement liquid phase directly to the surface of the soil particles with a strong force.

In addition, numerous solid pores are formed inside the solidified soil, and as a whole, air permeability, water permeability and water retention are generated, and the soil becomes extremely suitable for the growth of aerobic bacteria. Good soil for growth. Since the experiment was performed in an unsuitable winter cold season as a condition for cement solidification, an indoor experiment was performed. In conducting the laboratory experiments, samples were prepared with the formulations shown in Table 1 and tested.

[0053]

[Table 1]

The strength of the 7-year-old material as a result of the uniaxial compressive strength was examined, and the mixing efficiency of the laboratory test and the on-site construction was 1: 0.
6 (60%), it can be cleared by the sample of Formulation B containing 100 kg / m ³ of cement. Considering the winter temperature, the amount of ordinary Portland cement used is 100 kg /
It was determined that it was appropriate to select m ³ for work efficiency and economy reasons, so that the sample of B formulation was determined. Simultaneously with the above, the time during which the product can be transported was measured by a slump test, and was taken as one item of the conditions for determining the mixture. Table 2 shows the results of the slump test.

[0055]

[Table 2] {Unit SL = cm} Test conditions Room temperature 18 ° C Current soil Wet density = 1.178 Ton / m ³ Water content =
246.48%

Table 3 shows the results of the uniaxial compressive strength test for each of the samples A, B, C and D. Table 3 also shows changes in the wet density and the water content of each of the samples A, B, C, and D. Table 4 shows a table obtained by converting the uniaxial compressive strength shown in Table 3 into a cone index.

[0057]

[Table 3]

[0058]

[Table 4]

However, the relationship between the uniaxial compressive strength and the cone index is: qc kgf / cm ² = 5 qu kgf / cm ²
(Quoted from general clay, Geotechnical Survey, “Soil Survey Method”)
I unit conversion 1 kgf / cm ² ≒ 98.1 kN / cm ²
≒ 1 / 98.1 kgf / cm ² .

As is clear from Table 3, the current soil having a wet density of 1.178 Ton / m ^{3 and a} water content of 246.48% is a sample (sample) immediately after the addition of the soil and soil conditioner according to the present invention. Is, for example, in the case of sample A, 1.413 Ton / cm ³ water content ω = 2
It was 55.3%, but after 7 days of age, the water content solidified to an average of 77.9%, and the qu value was 138.6 kN / cm.
A value of ² was obtained. It can be seen that the degree of improvement increases as the material age advances, and the degree of improvement increases as the amount of cement added increases.

For the cone index, qc = 4 kgf /
Diversion of civil engineering soil and agricultural soil is permitted for more than ² cm ^2, but as is evident in Table 4, all samples (A, B, C, D) were included including the material age 7 days. It is understood that the cone index clears qc = 4 kgf / cm ² or more in the subsequent products.

In Table 2, when slump SL = 10 cm or less is considered to be loadable and transportable, samples A, B,
As a result of examining the time during which the fluidity of the improved soils of C and D is lost, Sample B clears SL = 10 cm or less in 150 minutes, and Sample C clears the condition of SL = 10 cm or less in 120 minutes.

That is, as can be seen from Table 1, slump SL = 10 cm or less in sample C to which cement was added at 120 kg / m ³ was 30 minutes earlier than in sample B to which cement was added at 100 kg / m ^3. The condition of is cleared. It can be said that the sample C is superior when the slump conditions are compared only for time.

However, as is clear from Table 4, the condition of the high quality soil qc = 4 kgf / cm ² is economical and economical because all the samples from A to D are already expressed on the age of 7 days. Taking into account the relationship between the above and the workability, it can be determined that sample B containing 100 kg / m ^{3 of} cement is advantageous.

[0065]

As described above, the soil and soil conditioner according to the present invention is composed of non-polluting inorganic components.
It can protect the natural environment, can be cured in a short period of time with the color of natural soil, can be provided as powder of condensed inorganic metal salts, and can be used as an aqueous solution at the time of construction, so transport and handling Is easy. Further, the hardness of the solidified body can be freely adjusted by the amount of cement added.

Further, the soil / soil improver according to the present invention, which connects the soil particles with needle-like crystals, results in a porous soil of the order of microns and has the same adsorption performance as activated carbon.

The solidified product obtained by adding the soil / soil improving agent according to the present invention and solidifying by the soil cement method is more compact than the solidified product obtained by the soil cement method using no soil / soil improving agent of the present invention. 3 bending and tensile strength
Since it is about 0% strong and the curing period after construction is short, the work process and construction period can be significantly reduced.

Further, the treated soil treated with the soil / soil improving agent according to the present invention can be changed to insoluble, so that even if the soil contains pollutants, the pollutants do not elute from the treated soil. .

The solidified soil particles improved using the soil / soil improver according to the present invention have the characteristics of age hardening, are stable for a long time, are difficult to age, and are not eroded by acids or alkalis. Since it can be cured in water and promotes the hydration-setting reaction, it has the effect of greatly shortening the curing period.

The improved soil improved by using the soil / soil improving agent according to the present invention can be utilized as it is as a soil for growing plants as it is, and is highly effective in the following construction applications. In other words, applications that make use of water permeable walls include elasticity improvement such as marsh ground improvement work, roads with remarkable runoff and collapse due to water, slope stabilization treatment for newly constructed land, solidification of ultra-soft soil, and roadbed improvement work for soft ground. It is suitable for general roads and airport base ground as an application utilizing the above.

Further, in a case such as a tennis court, the surface layer elasticity and the roadbed are integrated, the load is distributed, and the impact on the feet and hips can be reduced. In addition, it can be used for foundation work such as embankment stabilization processing, solid foundation for structures, and foundation work for civil engineering structures.

[Brief description of the drawings]

FIGS. 1 (a) to 1 (e) are diagrams showing the manner in which soil particles become improved soil by expressing the function of a soil / soil improving agent according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Soil particle 2 Adsorbed water / adhered water 3 Aqueous solution of active ingredient of soil conditioner / soil improver 4 Cement 5 Needle-like crystal 6 Solidified body 7 Pores

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09K 101: 00 C09K 101: 00

Claims (9)

[Claims] 1. A function to weaken the charge of adsorbed water and attached water on soil particles, a function to change the weakly charged adsorbed water and attached water to free water, and a function to form and generate needle-like crystals. A soil / soil improver characterized by containing an active ingredient. 2. The function of weakening the charge of the adsorbed water and the adhering water of the soil particles is such that an aqueous solution of the active ingredient exhibiting the above function generates a sufficient negative charge by charge reduction caused in water molecules, and the absorbed water Applying sufficient pressure to the positive charge of the layer of water, this layer of water breaks through the static potential barrier, thereby weakening the charge that was preventing the ingress of Ca ⁺⁺ ,
⁺⁺ disperse the dissolved components of the cement between the soil particles,
The soil / soil improver according to claim 1, wherein the soil / soil improver has a function of exerting an effect of ejecting water molecules around the soil particles out of the ion group. 3. The function of changing the weakly charged adsorbed water and attached water to free water is as follows: the cations in the aqueous solution of the active ingredient and the cations in the cement liquid phase exhibiting the functions are formed on the surface of the soil particles. The soil / soil improver according to claim 1, wherein the soil / soil improver has a function of initiating a coagulation reaction and thinning a water film on the surface of particles that are chemically bound water. 4. The function of changing the weakly charged adsorbed water and attached water to free water is to exchange Ca ⁺⁺ in the cement with ions on the particle surface, change the charged state on the soil particle surface, and change the clay particle After aggregating and aggregating, colloidal silica,
Colloidal alumina is reacted with Ca ^++, calcium silicate _{(4Ca · AlO 3, 13H 2} O), including the ability to produce a hydrate of gehlenite _{(2CaO 2, Al 2 O 3} · SiO 2 · 6H 2 O) The soil / soil improver according to claim 1, wherein 5. The function of forming and generating needle-like crystals is as follows: a hydrate such as calcium silicate, which is a hydration reaction of cement, generates embryo seeds which serve as a basis for bridging between soil particles. 2. The method according to claim 1, wherein the cement paste is produced and grown to lose the fluidity of the cement paste, and the needle-like crystals (ettringite) generated between the particles have a function of connecting the soil particles. Soil and soil conditioner. 6. The above functions are to change the physical properties of the soil particle interface even in soil with a lot of humus, to increase the stability of the soil, and to react Si and Al, in which the constituents of the soil particles are eluted, with Ca (OH) _2. The soil / soil improver according to claim 1, characterized in that the soil / soil improver has a function of promoting the formation of tobermorite hydrate and lime aluminate hydrate to firmly unite the soil particles. 7. The soil / soil improvement according to claim 5, comprising an inorganic metal salt as a main component, eliminating insufficient strength, forming a stable ground over a long period of time, and constructing a nearly permanent ground. Agent. 8. The method according to claim 1, wherein the active ingredient exhibiting the above function contains at least inorganic metal salts such as sodium chloride, potassium chloride, magnesium chloride and calcium chloride in addition to citric acid. The soil and soil conditioner described. 9. An active ingredient which expresses the above function, in addition to citric acid (1-5%), sodium chloride (15-2%).
5%), potassium chloride (20-35%), magnesium chloride (15-25%), calcium chloride (5-15%)
The soil / soil improver according to claim 7, further comprising an activity adjuvant (5 to 20%) containing calcium phosphate, sodium sulfate and the like.