KR20170036454A

KR20170036454A - Soil surfacing method with soil improvement compounds

Info

Publication number: KR20170036454A
Application number: KR1020150135629A
Authority: KR
Inventors: 이재형
Original assignee: 이재형
Priority date: 2015-09-24
Filing date: 2015-09-24
Publication date: 2017-04-03
Also published as: KR101847453B1

Abstract

The present invention relates to a soil paving material composition obtained by mixing soil, cement, and a soil conditioner; and a soil surface treatment method using a soil conditioner which uses a soil paving material to repair a pavement or a damaged portion of a road. According to the present invention, the soil surface treatment method using the soil conditioner comprises: a step of preparing a soil paving material by mixing soil and cement, and then adding the soil conditioner; a step of cutting a surface of a road requiring paving or repair; and a step of pouring the prepared soil paving material on a cut portion of the surface of the road, and curing the soil paving material after cutting the surface of the road. The soil conditioner added in the step of preparing the soil paving material comprises: aluminum sulfate, sodium lignin sulfonate, magnesium lignin sulfonate, potassium chloride, calcium chloride, magnesium chloride, sodium chloride, sodium tripolyphosphate, aluminum chloride, ferric chloride, calcium carbonate, and ammonia water.

Description

{Soil surfacing method with soil improvement compounds}

The present invention relates to a soil packing material composition in which soil, cement and a soil improving agent are mixed, and a soil surface treatment method using a soil improving agent capable of repairing the pavement or damaged part of the road using the soil packing material.

In general, road pavement is a road surface structure treated to protect roads and improve road surface and increase the flatness of roads to facilitate people's travel and driving of vehicles. It is a layer structure composed of several layers. Depending on the material of the surface layer, ) Pavement, concrete pavement and block pavement.

In order to produce sand or aggregate, which is the main material of the above-mentioned reverse-phase (asphalt) packing and concrete-based packing, there is a problem of damaging the natural environment inevitably. In the developed countries where crude oil can not be refined or cement can not be produced, There are many difficulties in paving roads with cement concrete.

In recent years, eco-friendly, green industry has been dominant in the world, and it has a lot of influence on civil engineering and construction field, so it is possible to replace asphalt and cement, which are the main elements of urban desertification, Construction methods are widely used for the construction of roads, parks, playgrounds, walkways, and sidewalks.

Unlike the asphalt and concrete pavement using the existing aggregate, the soil pavement method using the soil uses a cement or a solidifying agent to the surrounding soil such as the granite weathered soil, and the soil pavement has a relatively low load Bicycle roads, parking lots, roads in housing complexes, farm roads, walkways, park plazas, etc.

The conventional soil pavement method is divided into a wet type and a dry type. The wet type pavement method is performed by mixing a part of matsato or loess with a general concrete mixture using a solidifying agent using cement or general cement. It is convenient to use concrete plant but it is efficient by using remicon plant. Due to the nature of cement, long distance transportation is not possible, and there is a problem of environmental problems due to the use of a large amount of one kind of cement. In addition, There is a problem.

In addition, the dry pavement method has a high strength and durability because it is blended on site, but it has poor workability due to on-site mixing, transportation, pouring, and construction, and construction cost is high due to installation of manpower, , The surface strength is low, and there is a problem that secondary treatment is required after the second surface reinforcement is installed.

Especially, the soil used for the soil pavement construction method is a relatively small lump containing a very wide variety of components, and the material has a considerably low binding force. Therefore, it is difficult to use the soil as the soil pavement.

For example, Korean Patent Laid-Open Publication No. 2002-23907 discloses a method for forming a surface layer and a foundation by mixing 20 to 500 kg of cement and 0.8 to 3 kg of a cement hardener per m ³ of soil, Shielding soil or clay soil containing 30 to 40 wt% of shield or clay powder having a particle diameter of not more than 50 mu m and not more than 60 mu m, A method of constructing an environmentally improved soil contained in the soil is disclosed.

Korean Patent Registration No. 10-0632705 discloses a cement composition comprising 100 mass% of cement, 40 to 50 weight% of cement, 30 to 40 weight% of slag, 7 to 10 weight% of gypsum, 4 to 8 weight% of calcium sulfoaluminate (CSA) 10 to 15 parts by weight of loess powder composed of 3 to 7% by weight of fly ash, 1 to 6 parts by weight of ethylhydroxyethylcellulose, 1 to 5 parts by weight of red iron oxide and 12 to 15 parts by weight of water. A packaging composition is disclosed.

However, in the conventional technology, a soluble substance such as calcium hydroxide is eluted in addition to an insoluble substance such as calcium silicate hydrate (CSH) that exhibits strength during hydration reaction, and some heavy metals are included as a characteristic of a cement production process using industrial waste as a raw material Environmental pollution occurs, and soil paper with poor bonding force can not be used as it is, so it requires a high quality marble or clayey so that the selection of soil is limited. In addition, hydration reaction does not occur properly when the composition is mixed with the soil, so that it takes a long time for the initial strength development and the expression intensity is also low.

Korean Patent Registration No. 10-1276095 Korean Patent Registration No. 10-1139089 Korean Patent Publication No. 10-2002-0023907 Korean Patent Registration No. 10-0632705

The object of the present invention is to solve the problems of the conventional soil pavement method. By mixing soil cement with a small amount of cement and a soil improving agent to produce soil packing material, the asphalt or concrete using sand or aggregate can be used as general soil Which can be replaced with a soil pavement using a soil improvement agent.

It is another object of the present invention to provide a soil surface treatment method using a soil improving agent that has the advantages of the conventional wet pavement method and can overcome the disadvantages to exhibit environmentally friendly, convenient construction, high durability and a good appearance.

The soil pavement method using the soil improving agent of the present invention comprises the steps of mixing earth and cement and preparing a soil packing material by adding a soil improving agent; Shaving off the surface of a road requiring packaging or repair; Placing and preparing the prepared soil packaging material on the surface of the road; And the soil improving agent added in the soil packaging material preparation step is characterized by containing aluminum sulfate, sodium ligninsulfonate, magnesium ligninsulfonate, potassium chloride, calcium chloride, magnesium chloride, and sodium chloride.

In addition, the soil improving agent added in the soil packaging material preparation step may further include sodium tripolyphosphate, aluminum chloride, ferric chloride, calcium carbonate, and ammonia water at a concentration of 3%.

In the present invention, it is preferable that the step of preparing the soil packaging material comprises mixing the soil to the cement with a ratio of 89.5 to 98.45 wt%, 1.5 to 10 wt% of the cement, and 0.05 to 0.5 wt% of the soil improving agent.

The soil mixed in the soil packaging material preparation step is preferably composed of 70 to 80% by weight of general soil and 20 to 30% by weight of loess.

The soil improving agent added in the soil packaging material preparation step may include 4 to 6 wt% of aluminum sulfate, 4 to 6 wt% of sodium ligninsulfonate, 7 to 9 wt% of magnesium ligninsulfonate, 18 to 20 wt% of potassium chloride, 10 to 13 wt% % Of magnesium chloride, 21 to 25 wt% of magnesium chloride, 27 to 30 wt% of sodium chloride, 0.5 to 2 wt% of sodium tripolyphosphate, 2 to 4 wt% of aluminum chloride, 1.5 to 2.5 wt% of ferric chloride, By weight and ammonia water at a concentration of 3% of 0.3 to 0.6% by weight.

It is preferable that the surface of the existing road is shaved as if it is polished to a thickness of 5 to 10 mm before pouring the soil packing material prepared in the present invention.

In addition, in the present invention, the thickness of the soil pavement material poured in the curing and curing step of the soil pavement material is preferably 5 to 20 mm.

Since the present invention replaces asphalt or concrete using sand or aggregate with soil pavement, the soil is used as the main raw material, so there is no need for additional resource consumption and no separate treatment process is required at the time of disposal It is possible to realize low carbon green growth with little occurrence of secondary pollution.

In addition, the present invention can be applied not only to a specific soil such as a mashito having characteristics similar to sand but also to use clay-like general soil and loess, and by mixing a small amount of cement with a soil improving agent, excellent bending strength, It is possible to provide excellent durability such as low melting resistance and reduced drying shrinkage.

In addition, the present invention can solve the problems of quality control, the limitation of improvement of physical properties, and the problem of the amount of construction per hour, which have been problematic in the prior art by adopting a method of preliminarily mixing the soil, cement, And has a remarkable effect.

In addition, the present invention relates to a method of treating an environmental pollution problem caused by waste generated in a step of cutting a surface of an asphalt-packaged road to a thickness of 50 mm before installing a soil packing material on a road requiring packaging or repair in the prior art, , The surface of the road is shaved as if it is polished to a thickness of 5 to 10 mm, so that a large amount of problems

And can solve the problem of waste.

1 is a process diagram of a soil surface treatment method using a soil conditioner according to the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the process drawings shown in the drawings are merely the most preferred embodiments of the present invention, and not all of the technical ideas of the present invention are described. Therefore, It should be understood that various modifications may be made.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

FIG. 1 is a process diagram of a soil surface treatment method using a soil conditioner according to the present invention. FIG. 1 is a flowchart illustrating a method for preparing a soil conditioner according to the present invention. (S20) of cutting the surface of a road requiring packaging or repair; And a step (S30) of placing the prepared soil packaging material on the surface-cut portion of the road after curing the surface of the road (S20); .

In the step S10 of preparing the soil packing material, the soil, the cement and the soil improvement agent are mixed in advance in the factory, and then moved to the site using the transportation vehicle, unlike the existing road packing or repairing method.

The present invention differs from the conventional method in that cement, aggregate and water are directly mixed at the repair site to form concrete, but in the fact that the factory mixes the soil with cement and soil improving agent, There is a big difference from the method.

Also, mixing materials in situ as in the prior art causes many problems. More specifically, because the materials are first placed on the site, it is not easy to control the water content of the materials according to the rainfall and temperature, and since the mobile mixer can mix concrete of 7 m ³ per hour, the amount of construction per hour is very small there is a problem.

Also, since only a single type of cement can be used as a device limit of the mobile mixer, it is difficult to mix various improvers or additives, and thus it is difficult to improve the physical properties of the concrete composition.

However, in the present invention, the method of moving the soil, the cement, and the soil improving agent in advance through the transportation vehicle has been solved by solving the problems of the quality control, .

The step S20 of cutting off the surface of the road is to remove the contaminants adhering to the surface of the road and the exposed aggregate to secure the adhesion of the material on the road surface.

In the present invention, when the conventional asphalt concrete pavement is used, the surface of the road is cut to a thickness of 50 mm, while the surface of the road on which the soil pavement is to be laid is preferably polished to a thickness of 5 to 10 mm. The thickness of the surface of the road is limited to 5 to 10 mm. If it is less than 5 mm, there is a problem that the adhesion of the material can not be secured because the contaminants attached to the surface of the existing packed road and the exposed aggregate can not be sufficiently removed If it exceeds 10 mm, there is a problem of environmental pollution because a large amount of waste is generated.

In addition, impurities and laitance adhering to the surface of the road are removed (S21) by using sand blasting equipment, high-pressure water equipment containing abrasives, and water blasting equipment Finish the surface cleanup.

When the soil packing material is prepared and the surface of the road is shaved off and the surface of the road is cleaned, the soil packing material is placed and cured (S30).

It is preferable that the piling thickness is set to 5 to 20 mm according to the use, and equipment for exclusive use of soil pavement, in which the piling is concurrently performed, is utilized.

When the thickness is less than 5 mm, the strength of the soil packaging material is lowered. When the thickness is more than 20 mm, the permeability is not ensured and the thickness is limited.

Since the soil packing material has the same characteristics as the general soil before the compaction curing, and the water content of the packing material is not high, the mechanized packing by the equipment for exclusive use of the soil packing is ideal for quick casting in order to prevent the surface drying before compaction, Of course, it is possible to put it.

When the packaging of the soil packaging material is completed, it is preferable to cure for about 7 days.

The soil packaging material constructed as described above is improved in the problems of the conventional asphalt or concrete pavement, and can exhibit the natural color and texture of the soil.

Hereinafter, the soil packaging material according to the present invention will be described.

It is preferable to use an apparatus for producing a soil cement equipped with an impeller equipped with a scratch-off blade, which is disclosed in the above-mentioned Japanese Patent No. 10-644245, It is not necessarily limited to the uniformity of the film thickness.

The soil packaging material according to the present invention is made of soil, cement and soil improving agent.

As an embodiment, the soil packaging material is composed of 89.5 to 98.45% by weight of soil, 1.5 to 10% by weight of cement and 0.05 to 0.5% by weight of soil improving agent.

When the sum of the soil content is less than 89.5% by weight based on the soil packing material, the bending strength, compressive strength and freeze-thaw resistance of the soil packaging material may be lowered. When the content exceeds 98.45% by weight, And the soil material having a relatively small lump shape occupies a large weight, the binding force of the soil packaging material may be significantly lowered. Therefore, it is preferable that the total soil material content is 89.5 to 98.45% by weight.

If the sum of the cement content is less than 1.5% by weight based on the soil packing material, the strength improving effect and binding force of the soil packing material may be lowered. If the content exceeds 10% by weight, The sum of the cement contents is preferably 1.5 to 10 wt%.

If the sum of the soil modifying agent content is less than 0.05 wt%, the effect of improving the long-term strength and durability of the soil packing material may be insignificant. If the content of the soil modifying agent exceeds 0.5 wt% Therefore, it is preferable that the sum of the soil improver content is 0.05 to 0.5 wt%.

The cement is crushed and mixed with the above-mentioned gypsum (general gypsum or general soil including loess). This is because the gypsum containing fine fine particles absorbs water and solidifies, so that when water is put in the initial stage, It is preferable to thoroughly dry the soil and premix with the cement, and then add the soil improving agent and water.

After the dried soil and cement are mixed, the soil improving agent is added in the form of an aqueous solution and mixed. The concentration of the soil improving agent aqueous solution is not limited, and it is designed to meet the injection amount of the pump according to the cement ratio. The reason for making the soil improver into an aqueous solution state is that it is not easy to mix a small amount of additive in a large amount of soil, so that it is made into an aqueous solution state and its volume is increased so that even mixing can be facilitated. When the soil modifying agent aqueous solution is added and the mixing is completed, water is injected and mixed. When the soil modifying agent and water are added to the mixture of the dried soil and cement and mixed, The mixing ratio should be 150 ~ 200 RPM. The soil water modifier aqueous solution and water should be supplied by high pressure injection.

Here, the amount of water to be added is determined according to the water content of the soil, and the water content of the soil improving agent and the water are supplied so that the water content of the soil packing material is in the range of 23 to 27%. The water content is not fixed, To obtain the optimum water content.

The optimal water content ratio is known to any descriptor in the field to which this technique belongs, so that a detailed description thereof will be omitted.

In this case, the kind of the gypsum is not limited, and the gypsum having passed through a 10 mm sieve is used. In addition, 20 to 30% by weight of the common ocher can be contained in the gypsum based on the amount of the gypsum, It should be used with a 10 mm sieve.

The cement is used as a solidifying agent, and both single cement and mixed cement can be used, but it is generally preferable to use general Portland cement which can be easily purchased and used in the vicinity.

Further, the soil improver used in the present invention maximizes the performance of the cement, and maximizes the performance of the cement so that sufficient strength can be exhibited even if the content of the cement is 10 wt% or less. The soil improving agent is a metal ion such as sodium lignosulfonate, magnesium ligninsulfonate, aluminum sulfate, aluminum chloride, ferric chloride, etc., and ion exchange of humic acid protons dissolved in adsorbed water strongly adsorbed on soil particles, , It has a hydrophobic property to push off the adsorbed water, and the solidification of the soil rapidly proceeds, thereby improving soil quality by sand nitrification of clayey soil.

Wherein the soil improving agent comprises 4 to 6% by weight of aluminum sulfate, 4 to 6% by weight of sodium ligninsulfonate, 7 to 9% by weight of magnesium ligninsulfonate, 18 to 20% by weight of potassium chloride, 10 to 13% , Magnesium chloride in an amount of 21 to 25 wt%, sodium chloride in an amount of 27 to 30 wt%, sodium tripolyphosphate in an amount of 0.5 to 2 wt%, aluminum chloride in an amount of 2 to 4 wt%, ferric chloride in an amount of 1.5 to 2.5 wt%, calcium carbonate in an amount of 0.01 to 0.06 wt % And 3% ammonia water at a mixing ratio of 0.3 to 0.6% by weight.

The role of the constituent material of the soil improver will be described in more detail.

The aluminum sulfate induces the formation of its own gypsum by sulfate, thereby producing more ettringite, inhibiting the transition of etrinzite to monosulfate to obtain high strength, It is preferable that the aluminum sulfate contains 4 to 6% by weight of the soil improving agent. If the sum of the aluminum sulfate content is less than 4% by weight, the initial strength improvement effect of the soil packaging composition may be insignificant. If the content is more than 6% by weight, the initial strength development is excellent, It is not economical.

The sodium ligninsulfonate and magnesium ligninsulfonate prevent the solidification of the soil and the elution of the heavy metals in the contaminated soil as well as the natural color and texture of the soil without the addition of the artificial pigment by the added yellow loam, And that the sum of the content of sodium ligninsulfonate and the content of magnesium ligninsulfonate is in the range of 4 to 6 wt% and 7 to 9 wt%, respectively. If the sum of the contents of sodium ligninsulfonate and magnesium ligninsulfonate is 4 wt% or less and 7 wt% or less, respectively, the durability and cold resistance of the soil packaging material may deteriorate and exceed 6 wt% and 9 wt% No further action effects are seen.

The potassium chloride improves the early strength of the soil packing material by replacing the sulfuric acid group of the nitrite with the chlorine group to control the production of etyne zite and shortening the initial setting time so that the sum of the potassium chloride content is 18 ~ By weight to 20% by weight. If the total amount of the potassium chloride is less than 18% by weight, the early strength of the soil packaging material may be insignificantly improved. If the amount exceeds 20% by weight, the hydrate may not be densely formed due to rapid hydration, Can be degraded.

Wherein the magnesium chloride and sodium chloride promote the production of etrinite and enhance the freezing and thawing properties of the soil packaging material so that the sum of the magnesium chloride content is 21 to 25 weight percent and the sum of the sodium chloride content is 27 to 30 By weight. When the total content of magnesium chloride and sodium chloride is less than 21% by weight and less than 27% by weight, the amount of magnesium chloride and sodium chloride to be used is 25% by weight, If it exceeds 30% by weight, the amount of strongly acidic hydrogen chloride can not be controlled, so that it can not be improved from strong alkali to weak alkali of cement.

The sodium tripolyphosphate serves to improve the properties of the clay by trapping the metallic elements in the micropores to suppress the improvement of the early strength and the decrease of the late strength. The sum of the sodium triphosphite content is 0.5 - 2% by weight. When the sum of the sodium triphosphite content is less than 0.5% by weight, the effect of improving the long-term strength and durability of the soil packaging composition may be insignificant. If it exceeds 2% by weight, the initial curing rate is delayed, .

The aluminum chloride and the ferric chloride perform an ion exchange reaction, and aluminum chloride and ferric chloride, which are trivalent cations, Al ₂ and Fe ₂ exchange with univalent cations in the soil packaging material to enhance the strength of the soil packaging material It is preferable that the sum of the aluminum chloride content is 2 to 4 wt% and the sum of the ferric chloride content is 1.5 to 2.5 wt%. When the sum of the contents of the aluminum chloride and the ferric chloride is less than 2 wt% and less than 1.5 wt%, the trivalent cation necessary for the ion exchange reaction is small, showing a slight effect on the strength of the soil packaging material, Even if the sum of the contents of iron and iron exceeds 4 wt% and 2.5 wt%, further action and effects do not appear.

The calcium carbonate is used for the purpose of enhancing the strength. Some of the lime of the cement is combined with the carbon dioxide in the soil to produce calcium carbonate. Calcium carbonate improves the strength by densifying the soil structure having a lot of fine particles. However, since the amount of lime as a component of the cement is insufficient due to the use of a small amount of cement, the carbonation reaction does not occur well, and the calcium carbonate is added directly to form a dense structure of the soil. 0.01 to 0.06% by weight. If the sum of the contents of calcium carbonate is less than 0.01% by weight, the effect of improving the strength of the soil packaging material is insignificant, and if it exceeds 0.06% by weight, the effect is not enhanced.

The ammonia water plays a role of a catalyst, and a very small amount of ammonium chloride is used as a small amount of water, and a 3% concentration of ammonia water is used in the present invention. If the amount of ammonia water is less than 0.3% by weight, the function as a catalyst is insignificant. If the amount of ammonia water is more than 0.6% by weight, it is inefficient and there is a hygiene problem during the manufacturing process. Is preferably used.

Hereinafter, the principle of the present invention will be described.

If a large amount of water is added to the soil and used as a general concrete mixer, the increase of the specific surface area due to the fine particles may result in the lack of cement and the separation of materials due to light soil particles.

On the other hand, in the compact state like concrete, there is a phenomenon that the structure collapses due to the volume expansion due to the formation of ettringite, but in the soil packing material, the etlinite fills voids in the soil with many voids, Can greatly contribute.

Therefore, in soil packing materials, the content of cement, lime and gypsum is increased in order to promote the production of etrinzite. As the content of cement, lime and gypsum is increased, the basicity of the soil is promoted. In the present invention, the addition of a small amount of cement, an inorganic chloride composed of an alkali metal or a metal and aluminum sulfate or the like may be added to promote the production of etyne zeite, thereby enhancing the strength of the soil packaging material Method.

The addition of gypsum slows the rapid curing of 3CaO · Al ₂ O ₃ by adding gypsum, and it can lead to the destruction of the structure due to the optimal expansion in the case of ordinary concrete with small voids. On the other hand, The pores are filled by the expansion, and as a result, the strength enhancement of the soil packaging material is improved.

The added gypsum is completely exhausted by the production of etrinzite. As the concentration of sulfate in the wettable powder is lowered, the etlinzite is gradually transferred to monosulfate hydrate, causing volume change and strength of soil packing material. In order to reduce this phenomenon and to inhibit the formation of additional ettringite and to inhibit the basicization, it is possible to add gypsum instead of gypsum to induce the formation of gypsum itself and to react with unhydrated hydrates to produce additional ettringite It is possible to prevent cracking of road pavement by making it possible to obtain high strength of soil packing material and reduce unhydrated hydrate. The reaction can be represented by the following formulas (1) and (2).

That is, when a large amount of etrinite is generated in a general concrete having a small pore size due to the reaction with gypsum and the components of common cement, a collapse due to volume expansion occurs. However, in the case of a large void, a thin elongated bed Thereby forming a solid body having the same adsorbability as activated carbon as the fine pores of its own are formed.

Experiments were conducted on the appearance, compressive strength, freezing and thawing resistance, and haziness through the following examples.

( Example )

First, the test specimens were prepared by mixing 100 kg of the above gypsum, 10 kg of the cement and 0.5 kg of the soil improving agent. In this case, the soil improving agent is prepared by mixing 25 g of aluminum sulfate, 25 g of sodium ligninsulfonate, 40 g of magnesium ligninsulfonate, 90 g of potassium chloride, 50 g of calcium chloride, 105 g of magnesium chloride, 135 g of sodium chloride, 2.5 g of sodium tripolyphosphate, 15 g of aluminum chloride, 0.1 g of calcium and 2 g of ammonia water at a concentration of 3%.

( Comparative Example )

In addition, a reference specimen was prepared by mixing 100 kg of gravel and 10 kg of cement.

The appearance and compressive strength of the above Examples and Comparative Examples were measured, and the results are shown in Table 1 below.

Appearance and Compressive Strength Tests of Examples and Comparative Examples after Drying in Air Test Items division Item Results Test Methods

After air drying test
Example Appearance No crack Visual judgment Compressive strength
(N / mm ² ) 3 days 4.38
KS F2328: 2002
7 days 6.36 28th 11.19
Comparative Example Appearance No heat Visual judgment Compressive strength
(N / mm ² ) 3 days 4.32
KS F2328: 2002
7 days 5.76 28th 8.13

As shown in Table 1, the compressive strengths of the examples and the comparative examples were measured by the compressive strength test method of soil cement (KS F2328: 2002) after 3 days, 7 days and 28 days of curing under the condition of 23 ± 3 ° C As a result, at the age of 3 days and 7 days, the compressive strengths of the examples were about 1% and 10% higher than those of the comparative examples, respectively. And the increase in the number of patients.

The appearance and compressive strength of the examples and comparative examples were measured after the wet state test, and the results are shown in Table 2 below.

Appearance and Compressive Strength Tests of Examples and Comparative Examples after Wet State Test Test Items division Item Results Test Methods

Wet state
After the test
Example Appearance No crack Visual judgment Compressive strength
(N / mm ² ) 3 days 5.22
KS F2328: 2002
7 days 7.53 28th 18.25
Comparative Example Appearance No crack Visual judgment Compressive strength
(N / mm ² ) 3 days 5.01
KS F2328: 2002
7 days 6.84 28th 12.83

As can be seen from the above Table 2, the compressive strength test method (KS F2328: 2002) of the soil cement after curing for 3 days, 7 days, and 28 days under conditions of 23 ± 3 ° C. and humidity of 91 ± 2% As a result of the measurement of the strength, it was confirmed that the compressive strengths of the examples were increased by about 4% and 10%, respectively, at the third and seventh days of the ages. Compared with the comparative example, 40% strength improvement was observed.

The appearance and compressive strength of the examples and comparative examples after the freeze-thaw test were measured, and the results are shown in Table 3 below.

Appearance and Compressive Strength Tests of Examples and Comparative Examples after Freezing and Thawing Test Test Items division Item Results Test Methods

Freeze-thaw
After the test
Example Appearance No crack Visual judgment Compressive strength
(N / mm ² )
28th
14.54 KS F2456: 1998
KS F2328: 2002
Comparative Example Appearance No crack Visual judgment Compressive strength
(N / mm ² )
28th
9.33 KS F2456: 1998
KS F2328: 2002

As shown in Table 3, the compressive strength was measured by the compressive strength test method of soil cement (KS F2328: 2002) after the resistance test of concrete for rapid freezing and thawing (KS F2456: 1998) The strength enhancement of about 56% was observed compared to the comparative example.

Table 4 shows the appearance and compressive strength measurement results of the examples and comparative examples after the freeze-thaw repeated test.

Appearance and Compressive Strength Tests of Examples and Comparative Examples after Repeated Freezing and Thawing Test Test Items division Item Results Test Methods

Freeze-thaw
Repeat test
after
Example
Appearance No crack Visual judgment Compressive strength
(N / mm ² )
28th
13.35 KS F2456: 1998
KS F2328: 2002
Comparative Example
Appearance No crack Visual judgment Compressive strength
(N / mm ² )
28th
8.33 KS F2456: 1998
KS F2328: 2002

Table 4 above shows that after 28 days of curing, the concrete was subjected to a resistance test method (KS F2456: 1998) for 20 cycles of rapid freezing and thawing and the compressive strength was tested. As a result, the compressive strength of the example was about 60% As shown in FIG.

Table 5 shows the flexural strength measurement results of the examples and comparative examples.

Flexural strength test of Examples and Comparative Examples Test Items division Item Results Test Methods
Freeze-thaw
Repeat test
after
Example
Compressive strength
(N / mm ² )
28th
3.5
KS F2325: 2002
Comparative Example
Compressive strength
(N / mm ² )
28th
2.4
KS F2325: 2002

Table 5 shows the flexural strengths of the comparative examples and the examples when the flexural strength test of the soil cement (KS F2325: 2002) was carried out after curing for 28 days under the condition of 23 占占 폚. As a result, 46% higher.

Table 6 shows the results of the hazard test of the examples.

The hazard test of the example Test Items unit Results of Examples Hazardous substance standard value Test Methods Pb

mg / L

0.14 <3

Waste process
Test method

As 0.17 <1.5 Hg 0.0006 <0.005 CN ^- Non-detection <1 Cr ⁺⁶ Non-detection <1.5 CD Non-detection <0.3 Cu 0.15 <3 Organic phosphorus compound Non-detection <1 Tetrachlorethylene Non-detection <0.3 Trichlorethylene Non-detection <0.3

As shown in Table 6, all of the harmfulness test results of the examples were measured to be less than the reference value, and it was found that there was no harmfulness.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

Claims

Mixing the soil and the cement, and adding a soil improving agent to prepare soil packing material;
Shaving off the surface of a road requiring packaging or repair; And
Placing and preparing the prepared soil packaging material on the surface of the road; Lt; / RTI >
Wherein the soil improving agent added in the step of preparing the soil packing material comprises aluminum sulfate, sodium ligninsulfonate, magnesium ligninsulfonate, potassium chloride, calcium chloride, magnesium chloride, and sodium chloride.

The method according to claim 1,
Wherein the soil improving agent added in the soil packaging material preparation step further comprises sodium tripolyphosphate, aluminum chloride, ferric chloride, calcium carbonate, and ammonia water at a concentration of 3%.

The method according to claim 1,
Wherein the soil packing material is prepared by mixing 89.5 to 98.45 wt% of soil, 1.5 to 10 wt% of cement, and 0.05 to 0.5 wt% of a soil improving agent.

The method of claim 3,
Wherein the soil material mixed in the soil packaging material preparation step is composed of 70 to 80% by weight of common soil and 20 to 30% by weight of loess.

The method of claim 3,
The soil improving agent added in the soil packaging material preparation step may include 4 to 6 wt% of aluminum sulfate, 4 to 6 wt% of sodium ligninsulfonate, 7 to 9 wt% of magnesium ligninsulfonate, 18 to 20 wt% of potassium chloride, 10 to 13 wt% % Of magnesium chloride, 21 to 25 wt% of magnesium chloride, 27 to 30 wt% of sodium chloride, 0.5 to 2 wt% of sodium tripolyphosphate, 2 to 4 wt% of aluminum chloride, 1.5 to 2.5 wt% of ferric chloride, By weight of ammonia water and 0.3 to 0.6% by weight of ammonia water at a concentration of 3% by weight based on the total weight of the soil.

The method according to claim 1,
Wherein the step of carving out the surface of the road is carried out by polishing the surface of the existing road with a thickness of 5 to 10 mm.

The method according to claim 1,
Wherein the thickness of the soil packaging material is 5 to 20 mm at the time of piling and curing the soil packaging material.