KR100954341B1 - Composite for soil pavement and construction method of soil pavement using the composite - Google Patents

Abstract

PURPOSE: A composition for soil pavement and a soil pavement construction method using the same are provided to improve the exterior and reduce the construction period. CONSTITUTION: Composition for soil pavement is poured on the ground according to a sub-base course of the field. The composition for the soil pavement is stepped by a roller. A joint for preventing the cracking of the composition for the soil pave is out carried. The composition for the soil pavement is installed on the top of the joint.

Description

Composition for soil pavement and construction method of soil pavement using the same {Composite for soil pavement and construction method of soil pavement using the composite}

The present invention relates to a composition for soil packaging and a method for constructing soil packaging, and more particularly, to use the surface, such as roads, parks, trails, cilantro, artificial stone, landscaping sculptures, sports grounds of sports facilities, etc. It is beautiful in appearance, excellent in strength and durability, excellent in water-retaining and moisturizing properties, and can be easily installed on site, so it is possible to shorten the construction period. It is about.

Due to artificial concentration in the city center, heat island phenomena where local temperature rises locally due to the increase of artificial arrangement, decrease of green spaces by buildings, and deterioration of atmospheric purification due to urbanization are becoming a big social problem. It is pointed out that this is related to the increase of heat stroke, urbanized heavy rain and increase of photochemical oxidant concentration with the increase of tropical night in summer. The increase in temperature causes a vicious cycle in which the heat island phenomenon proceeds further due to the increase in air irradiation (energy use).

In addition, since sidewalks, driveways, parks, parking lots, etc. in urban areas all use concrete pavement or asphalt pavement, water is introduced into drains and discharged into drains early, and water stored on the pavement evaporates early.

For this reason, as the temperature rises in the downtown area, the pavement surface becomes a high temperature, so that a heat island (heat island) phenomenon occurs that increases the downtown temperature and worsens the living environment.

Therefore, in order to reduce the heat island phenomenon caused by artificial packaging, it is necessary to develop a packaging material that can easily supply moisture to the basement, have a low heat capacity, and repair moisture. Soil packaging is being developed in this context.

As a binder that solidifies soil for paving soil, cement is mainly used because it can solidify soil at a low cost and is simple to use. However, cement-based solidified materials have problems such as deterioration in durability due to the East Sea, cracking due to dry shrinkage, and risk of leaching heavy metals.

Therefore, many researches and developments are being conducted on environmentally friendly binders for soil solidification. The composition and solidifying material for soil packaging are presented in the Republic of Korea Patent Publication No. 570958, Republic of Korea Patent No. 590392, Republic of Korea Patent No. 632705, Republic of Korea Patent No. 814147. However, the soil packaging composition and the solidified material is a large amount of cement is mixed can not solve the existing problems that the cement has. In addition, ordinary portland cement generally used as a binder has a Blaine powder of about 2,800 to 3,500 cm 2 / g, which has a disadvantage of slowing the hydration reaction of cement due to contact with water, and thus takes a long time to cure. There is a disadvantage that the initial strength expression is late.

The technical problem to be achieved by the present invention is to take advantage of the excellent properties of the soil, beautiful appearance, improved strength and durability, excellent water retention and moisture retention, and at the same time the construction is simple in the field can be installed in a short time The present invention provides a friendly soil packaging composition and a method for constructing soil packaging using the same.

The present invention comprises 70 to 99.8% by weight of soil, 0.5 to 10% by weight of cement-based binder, 0.1 to 15% by weight of polymer-based binder and 0.5 to 5% by weight of water. The present invention provides a soil paving composition comprising particulate cement in the / g range, fillers to improve durability, and amorphous calcium aluminate to increase hydration reactivity.

The cement-based binder may include 65 to 93 wt% of fine cement, 5 to 15 wt% of filler, and 0.2 to 20 wt% of amorphous calcium aluminate, and the filler may be silica powder.

In addition, the cement-based binder further comprises 0.1 to 2% by weight of a reducing agent to secure the strength, durability and fluidity of the soil packaging composition, the reducing agent may be a polycarboxylic acid-based, melamine-based or naphthalene-based water reducing agent.

The polymer-based binder may include an acrylic emulsion that selectively ionizes cations on the surface of the inorganic component and partially bonds with the inorganic component to form a matrix structure as a whole to induce bonds between the inorganic materials.

The acrylic emulsion comprises an acrylic resin and a reactive surfactant, the reactive surfactant being an alkylbenzene sulfonic acid, alpha-olefin sulfonate, sodium lauryl ether sulfate, ammonium lauryl ether sulfate and sodium diisooctyl sulfoser It is composed of at least one surfactant selected from among the sinate, the reactive surfactant may be contained in 0.05 to 3% by weight in the acrylic emulsion.

In addition, the polymer-based binder may further include a polyacrylic acid-based absorbent polymer and methyl cellulose to improve water retention and moisture retention, and the polyacrylic acid-based absorbent polymer and methyl cellulose may be 1 to 25 with respect to the polymer-based binder. It is preferable to contain by weight%. The polyacrylic acid-based absorbent polymer and methyl cellulose are preferably contained in a ratio of 0.6 to 0.8: 0.2 to 0.4 with respect to the polymer binder.

The soil packaging composition further comprises 0.05 to 1% by weight of a pigment for imparting aesthetics of the soil package, the pigment is one selected from titanium oxide, red iron oxide, yellow iron oxide, chromium oxide, purple iron oxide and black iron oxide It may be made of the above material.

In addition, the present invention, the step of first laying after confirming the degree of compaction of the auxiliary base layer and the base layer of the site to be soil-packing the soil composition, and the first step of compacting by using a roller for the soil packaging composition Step of constructing the joint to prevent cracking due to shrinkage of the soil packaging composition, and the second step of laying the earth composition for the surface gradient on the surface of the joint construction and the second paving earth composition Provides a method for the construction of soil using the composition for soil packaging comprising the step of compacting the second.

The earth-friendly composition for earth packaging according to the present invention has a high curing speed, high strength and durability. Naturally friendly earth packaging composition of the present invention can obtain a high strength capable of initial strength by containing a cement-based binder containing fine cement having a grain powder of 3,500 ~ 7,000 ㎠ / g range, acrylic emulsion, By containing the polyacrylic acid-based absorbent polymer and methyl cellulose, the water-retaining and moisturizing properties of the soil packaging composition are improved, and durability such as salt resistance and freeze-thawing resistance is improved.

In addition, it can be used for surface areas such as roads, parks, trails, cilantros, artificial stones, landscaping sculptures, sports grounds of sports facilities, etc. Therefore, the construction can be easily performed in the field has the effect of shortening the construction period.

In addition, since the amount of cement used is small, there are almost no problems with the conventional cement-based solidifying material.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. It doesn't happen.

According to a preferred embodiment of the present invention, the composition for soil packaging having a high curing speed, high strength and durability, and excellent water retention and moisture retention is 70 to 98.9 wt% of soil, 0.5 to 10 wt% of cement binder, and 0.1 to 15 wt% of polymer binder. And 0.5 to 5% by weight of water.

The cement-based binder includes fine cement, fillers to improve durability, and amorphous calcium aluminate to increase hydration reactivity. In addition, the cement binder may further comprise 0.1 to 2% by weight of a reducing agent in order to secure the strength, durability and fluidity of the soil packaging composition.

The polymeric binder includes an acrylic emulsion. In addition, the polymeric binder may further include a polyacrylic acid-based absorbent polymer and methylcellulose to enhance water retention and moisture retention.

In addition, the soil packaging composition of the present invention may further include a pigment for imparting aesthetics of the soil package.

Soil packaging composition according to a preferred embodiment of the present invention can be easily purchased at low cost because the soil is found in abundance as a main raw material, and even when discarded, since secondary pollution hardly occurs, a separate There is no need for treatment and eco-friendly. As the soil used in the soil packaging composition, it is preferable to use masato, granite soil or loess, which are soils obtained by weathering granite.

The fine cement has a Blaine powder of 3,500 ~ 7,000 ㎠ / g, compared to the general ordinary portland cement has a grain of about 2,800 ~ 3,500 ㎠ / g is very fine in contact with water to hydrate the reaction of cement This fastness not only increases the initial strength of the cement but also the long-term strength of the hardened cement. The fine cement is preferably contained 65 to 93% by weight based on the cement binder. When the content of the fine cement is less than 65% by weight, the adhesion to the soil is weak and the initial strength is small, when the content exceeds 93% by weight hydration reaction may be too fast workability may not be good.

It is preferable to use silica powder as the filler. Silica powder refers to a high purity powder having a SiO ₂ content of 99.7% or more, and has high properties of acid, alkali, heat resistance and hardness, and extremely low thermal expansion, electrical conductivity, and abrasion resistance. Used as a filler. The filler is preferably contained 5 to 15% by weight based on the cement binder. When the content of the filler is less than 5% by weight, the workability, adhesion strength and durability improvement effect is insignificant. When the content of the filler exceeds 15% by weight, good physical properties can be obtained, but the manufacturing cost is high and it is not economical. Instead of the silica powder, at least one material selected from silica fume, fly ash and blast furnace slag may be used as a filler.

The amorphous calcium aluminate is an inorganic superhard material obtained by crushing the Blaine powder to about 7,000 to 9,000 cm 2 / g to increase the hydration reactivity, and when reacted with water, it reacts with water in an instant to cause ettringite. By generating hydrates, the compressive strength of a typical Portland cement, which must be days or even tens of days when mixed with cement, can be achieved within hours. The amorphous calcium aluminate is preferably contained 0.2 to 20% by weight based on the cement binder. Increasing the weight ratio of amorphous calcium aluminate shows fast curing properties. If the content is less than 0.2% by weight, the strength and cracking inhibiting effect is weak, and if it exceeds 20% by weight, good properties are obtained due to the fast curing property. However, it is not economical because the manufacturing cost is high.

The water reducing agent is used to secure the strength, durability and flowability of the composition. The water reducing agent may be a polycarboxylic acid-based, melamine-based or naphthalene-based water reducing agent. The water reducing agent is preferably contained 0.1 to 2% by weight based on the cement binder.

In addition, within the scope of not impairing the object of the present invention, the cement-based binder may further include an additive such as an accelerator, a retardant and an antifoaming agent within a range of 10% by weight.

The polymer-based binder is used to improve the curing time, workability, durability, water retention and moisture retention of the soil packaging composition, and includes an acrylic emulsion, and further includes a polyacrylic acid-based absorbent polymer and methyl cellulose. can do.

The acrylic emulsion is made by adding a reactive surfactant to an acrylic resin. The acrylic resin is used as an adhesive binding agent mainly composed of pure acrylic ester monomers including methyl methacrylate (MMA) and the like, and an acrylic emulsion in which a reactive surfactant is added to the acrylic resin is used for aggregates such as cement and aggregates. When mixed with, it is excellent not only as an adhesive but also as a sensitizing effect, and it has excellent strength expression, leveling and crack prevention effect. When the acrylic emulsion is used, the adhesive strength and the breaking strength after curing are excellent, and the strength of the cement is increased to prevent desorption after adhesion and at the same time, the durability is excellent. Anionic surfactants, cationic surfactants or nonionic surfactants may be used as the reactive surfactants, but are considered anionic in consideration of reactivity with components such as cement-based binders, soils, etc., which are included as components of the soil packaging composition. It is more preferable that it is surfactant. By using an acrylic emulsion containing an anionic surfactant, it is possible to selectively ionically bond with the cation on the surface of the inorganic component and partially adhere by bonding with the inorganic component to form a matrix structure as a whole to induce the inorganic bonds. For example, as the reactive surfactant, alkylbenzene sulfonic acid, alpha-olefin sulfonate, sodium lauryl ether sulfate, ammonium lauryl ether sulfate lauryl ether sulfate), sodium diisooctyl sulfosuccinate or mixtures thereof. It is preferable that the said reactive surfactant is contained 0.05 to 3 weight% with respect to an acrylic emulsion.

When only acrylic emulsion is used as the polymer-based binder, polyacrylic acid-based absorbent polymer and methyl cellulose are used to improve the water retention and moisture retention because the durability of the composition is increased but the water retention and moisture retention are weak.

When the polymer-based binder includes a polyacrylic acid-based absorbent polymer and methyl cellulose, the viscosity of the composition increases, thereby improving workability and promoting water absorption, thereby improving water retention and moisture retention. It is preferable to mix the said polyacrylic-acid absorbent polymer and methyl cellulose in the ratio of 0.6-0.8: 0.2-0.4. If the ratio is out of the ratio, the effect of improving water retention and moisturizing properties is weak. The polyacrylic acid-based absorbent polymer and methyl cellulose are preferably contained in an amount of 1 to 25% by weight based on the polymer binder. When the content of the polyacrylic acid-based absorbent polymer and methyl cellulose exceeds 25% by weight, the water-retaining and moisturizing properties of the soil-packing composition are improved, but the stability is lowered, so that the early strength expression of the soil-packing composition is lowered. The water-retaining and moisturizing effects of the composition are weak.

The polymer-based binder is preferably contained in 0.1 to 15% by weight relative to the soil packaging composition. When the content of the polymeric binder exceeds 15% by weight, the viscosity of the soil packaging composition becomes too high, resulting in poor workability (slump), delayed hydration reaction, lowering early strength, and lowering price competitiveness. If the content is less than 0.1% by weight, it is difficult to expect satisfactory durability, and the water retention and moisture retention are weak.

The pigment is for imparting aesthetics of the soil package, and various pigments may be used, and inorganic pigments are particularly preferable. The inorganic pigment may include titanium oxide (white), red iron oxide, yellow iron oxide, chromium oxide (Cr ₂ O ₃ ), purple iron oxide, black iron oxide (carbon black), and the like. It is preferable that it is 0.05-1.0 weight% with respect to weight.

Hereinafter will be described the soil packaging construction method using the composition for soil packaging of the present invention.

Soil paving method is to determine the degree of compaction of the sub-base and base in the field, and then mixing 0.5 to 10% by weight of the cement-based binder and 70 to 98.9% by weight of soil such as masato, granite or loess, and soil and cement-based Mixing the mixture of 0.5 to 5% by weight of water and 0.1 to 15% by weight of the polymer-based binder to obtain a composition for soil packaging, and a first laying step for laying the soil composition on a site to be paved with soil; 1 step of compacting the composition using a roller or the like, constructing the joints to prevent cracking due to shrinkage of the earth-packing composition, and constructing the earth-packing composition for surface gradient on the joints of the earth-packing composition. The second step of laying and the second step of laying the earth composition for paving earth paving comprising the second step.

Hereinafter, the embodiments of the present invention for packaging the soil having a high curing speed and high strength and durability according to the present invention in more detail, the present invention is not limited by the following examples.

<Example 1>

6.9% by weight of cement binder, 88% by granite soil, 2% by weight loess and 0.1% by weight of white pigment (titanium oxide) were added to a forced mixer and stirred, followed by further mixing 1% by weight of water and 2% by weight of polymeric binder. After stirring again for 2 minutes to prepare a composition for earth packaging having a fast curing speed, high strength and durability. In this case, the cement-based binder includes 92% by weight of fine cement, 2% by weight of amorphous calcium aluminate, 5.7% by weight of silica powder, and 0.3% by weight of a reducing agent, and the polymer-based binder used only an acrylic emulsion.

<Example 2>

6.9% by weight of cement binder, 88% by granite soil, 2% by weight loess and 0.1% by weight of white pigment (titanium oxide) were added to a forced mixer and stirred, followed by further mixing 1% by weight of water and 2% by weight of polymeric binder. After stirring again for 2 minutes to prepare a composition for earth packaging having a fast curing speed, high strength and durability. In this case, the cement binder comprises 92% by weight of fine cement, 2% by weight of amorphous calcium aluminate, 5.7% by weight of silica powder and 0.3% by weight of a reducing agent, wherein the polymer-based binder is 85% by weight of an acrylic emulsion and a polyacrylic acid absorbent polymer. 9% by weight and 6% by weight of methyl cellulose were used in combination.

<Example 3>

6.9% by weight of cement binder, 88% by granite soil, 2% by weight loess and 0.1% by weight of white pigment (titanium oxide) were added to a forced mixer and stirred, followed by further mixing 1% by weight of water and 2% by weight of polymeric binder. After stirring again for 2 minutes to prepare a composition for earth packaging having a fast curing speed, high strength and durability. In this case, the cement-based binder comprises 92% by weight of fine cement, 2% by weight of amorphous calcium aluminate, 5.7% by weight of silica powder and 0.3% by weight of a reducing agent, wherein the polymer-based binder is 90% by weight of an acrylic emulsion and a polyacrylic acid absorbent polymer. 6% by weight and 4% by weight of methyl cellulose were used in combination.

In order to more easily understand the characteristics of the above Examples 1 to 3 has been presented comparative examples that can be compared with the embodiments of the present invention.

Comparative Example 1

Usually, 6.9% by weight of Portland cement, 88% by weight of granite, 2% by weight of ocher, 0.1% by weight of white pigment (titanium oxide) and 3% by weight of water were added to a forced mixer and stirred to prepare a composition for general soil packing.

Comparative Example 2

Usually 6.9% by weight of Portland cement, 88% by granite soil, 2% by weight ocher and 0.1% by weight of white pigment (titanium oxide) are added to a forced mixer and stirred, and then 1% by weight of water and 2% by weight of acrylic emulsion are added. The mixture was stirred for another 2 minutes to prepare a composition for soil packaging.

The following test examples are experiments in which the characteristics of Examples and Comparative Examples 1 and 2 according to the present invention are compared to the characteristics of Examples 1 to 3 according to the present invention as described above. The results are shown.

<Test Example 1>

A compressive strength test was carried out in accordance with the method specified in KS F 2405 for the earth packaging composition having a high curing speed, high strength and durability according to Examples 1 to 3, and the earth packaging composition prepared according to Comparative Examples 1 and 2. It was.

Table 1 below shows the change in compressive strength over time.

division Compressive strength (kgf / ㎠) 1 day later 7 days later 28 days later Example 1 95 135 232 Example 2 111 172 282 Example 3 101 162 269 Comparative Example 1 50 96 172 Comparative Example 2 68 120 201

As shown in Table 1, Examples 1 to 3 can be performed because the hardening after 1 day after construction, Comparative Example 1 and Comparative Example 2 is low work hardening even after 1 day work There is a difficulty in doing this. In addition, even after completely cured, Examples 1 to 3 were significantly higher in compressive strength than Comparative Examples 1 and 2.

<Test Example 2>

The earthing composition having a high curing rate, high strength and durability according to Examples 1 to 3, and the earthing composition prepared according to Comparative Examples 1 and 2 were subjected to flexural strength test according to the method specified in KS F 2408. .

Table 2 below shows the results of the flexural strengths cured for 24 days.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Flexural strength (kgf / ㎠) 45 58 50 23 35

As in Table 2, Examples 1 to 3 were significantly higher in flexural strength than Comparative Example 1 and Comparative Example 2.

<Test Example 3>

After immersing in water for 7 days in accordance with the method specified in KS F 4004 and the composition prepared according to Comparative Example 1 and Comparative Example 2 and the soil packaging composition having a high curing rate and high strength and durability of Examples 1 to 3 The maximum absorption was measured and the surface condition of the composition was confirmed after the measurement.

Higher maximum absorption indicates better water retention and moisture retention of the soil package.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Absorption rate (%) 2.2 3.3 3.0 12.5 2.0 Surface condition after 7 days immersion No change No change No change Dissociation No change

As shown in Table 3, Examples 1 to 3 has a lower water absorption than Comparative Example 1 and Comparative Example 2. In the case of Example 1, only the acrylic emulsion was used as the polymer-based binder, and the maximum absorption was lower than that of Examples 2 and 3.

Meanwhile, in Examples 2, the maximum absorption was found to be the highest, but in Example 2, the content of the polyacrylic acid-based absorbent polymer and methyl cellulose, which are absorbent polymers as the polymer-based binder, was found in Example 3. Compared with the case where a relatively large amount of polyacrylic acid-based absorbent polymer and methyl cellulose are added, the maximum absorption rate increases. From this, when the polyacrylic acid-based absorbent polymer and methyl cellulose are contained as the polymer-based binder, the soil packaging composition of the present invention is expected to be excellent in water retention and moisture retention properties.

On the other hand, in Examples 1 to 3 it was found that the phenomenon (dissociation) of tissue damage by water does not occur even after immersion for 7 days.

As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various deformation | transformation by a person of ordinary skill in the art within the scope of the technical idea of this invention is carried out. This is possible.

Claims (9)

70 to 98.9 wt% of soil, 0.5 to 10 wt% of cement binder, 0.1 to 15 wt% of polymer binder, and 0.5 to 5 wt% of water, The cement-based binder is 65 to 93% by weight fine cement with a range of 3,500 to 7,000 cm 2 / g of the fine particle, 5 to 15% by weight of silica powder to improve durability, and 7,000 to 9,000 to increase the hydration reactivity. 0.2 to 20% by weight of amorphous calcium aluminate, cm 2 / g, The polymer-based binder is an acrylic emulsion that selectively ionizes cations on the surface of the inorganic component and partially bonds with the inorganic component to form a matrix structure to induce bonds between the inorganic substances, and to improve water retention and moisture retention. Polyacrylic acid-based absorbent polymer and methyl cellulose for, The polyacrylic acid-based absorbent polymer and methyl cellulose are contained 1 to 25% by weight based on the polymer binder, The acrylic emulsion comprises an acrylic resin and a reactive surfactant, the reactive surfactant being an alkylbenzene sulfonic acid, alpha-olefin sulfonate, sodium lauryl ether sulfate, ammonium lauryl ether sulfate and sodium diisooctyl sulfoser It is composed of at least one surfactant selected from the nate, the composition for soil packaging, characterized in that contained 0.05 to 3% by weight in the acrylic emulsion. delete The method of claim 1, wherein the cement-based binder, The soil packaging composition further comprises 0.1 to 2% by weight of a reducing agent for securing the strength, durability and fluidity of the soil packaging composition, wherein the water reducing agent is a polycarboxylic acid-based, melamine-based or naphthalene-based water reducing agent. delete delete delete The soil packaging composition according to claim 1, wherein the polyacrylic acid absorbent polymer and methyl cellulose are contained in a ratio of 0.6 to 0.8: 0.2 to 0.4 with respect to the polymer binder. The method of claim 1, further comprising 0.05 to 1% by weight of a pigment for imparting aesthetics of the soil package, wherein the pigment is one selected from titanium oxide, red iron oxide, yellow iron oxide, chromium oxide, purple iron oxide, and black iron oxide. Soil packaging composition, characterized in that consisting of the above materials. A step of first laying after confirming the degree of compaction of the auxiliary base and the base of the site to be soil-packed with the composition for soil packaging according to claim 1; Primary compaction using a roller with respect to the soil packaging composition; Constructing the joint to prevent cracking due to shrinkage of the soil packaging composition; Secondly laying the earth composition for surface gradient on the jointed surface; And A soil paving method using the soil paving composition of claim 1 comprising the step of second compacting the secondary paving earth paving composition.