KR102537572B1 - Slope stabilizer - Google Patents

Abstract

The present invention relates to a slope stabilizer composition comprising, based on 100 parts by weight of desulfurized gypsum, 10 to 40 parts by weight of blast furnace slag, 40 to 70 parts by weight of fly ash, 10 to 40 parts by weight of paper ash, 15 to 55 parts by weight of fluorine-based additive, and 10 to 40 parts by weight of a water-soluble polymer.

Description

Slope stabilizer composition {SLOPE STABILIZER}

The present invention relates to a slope stabilizer composition, and in detail, introduces a fluorine-based additive and a water-soluble polymer to effectively prevent loss due to rainwater on cutting and embankment slopes of highways or national highways, exhibits excellent strength and durability, and scatters dust during construction work It relates to a slope stabilizer composition that significantly reduces the occurrence of

A considerable number of slopes (slopes) are formed due to civil engineering works for the development of roads, housing complexes, or industrial complexes. Such a slope not only makes the viewer visually anxious, but also soil loss may occur due to erosion and scour by rainwater, and the surface of the slope is weakened by weathering and frostbite, and rainwater permeates and elutes. If the groundwater level rises due to water, etc., the slope becomes unstable in the long term, and there is a high possibility of collapse.

In particular, torrential rains that occur in a short period of time, such as the rainy season, cause the groundwater level to exceed the saturation capacity of the ground and cause a decrease in the shear strength of the ground, acting as a direct cause of slope collapse. In addition, there are various causes of slope collapse, such as artificial cutting, geometric change due to erosion, and external load increase.

Accordingly, various design standards for the slope shape, such as slope and height, are proposed to secure the stability of the slope, but the design process is complicated and the stabilization effect is insufficient.

Recently, methods using slope stabilizers using cement, etc. have been proposed, but a large amount of scattering dust is generated during construction work, which causes damage to the surrounding environment and constructors. In addition, there is a disadvantage that is not suitable for vegetation composition on slopes due to excessively high compressive strength.

Therefore, it is necessary to develop a new slope stabilizer capable of maintaining long-term stability of the slope, improving the working environment by reducing the occurrence of powder scattering dust generated in the construction process, and creating a pleasant landscape through the creation of green areas on the slope.

Republic of Korea Patent No. 10-1179582 (2012.08.29)

An object of the present invention is to improve the work environment and surrounding environment of the constructor by solving the problem of large amount of scattering dust in the slope stabilization construction process.

In addition, it is to provide a slope stabilizer composition that exhibits excellent compressive strength and durability without using cement by solving the problems of low strength and durability compared to cement-based slope stabilizers.

In addition, it is possible to create a pleasant landscape through the creation of green areas on the slope, thereby providing a slope stabilizer composition having safety and comfort in harmony with the natural ecosystem.

The present invention, based on 100 parts by weight of desulfurized gypsum, 10 to 40 parts by weight of blast furnace slag (slag); 40 to 70 parts by weight of fly ash; 10 to 40 parts by weight of paper ash; 15 to 55 parts by weight of a fluorine-based additive; And it provides a slope stabilizer composition comprising 10 to 40 parts by weight of a water-soluble polymer.

According to one aspect, the fly ash may be a high calcium fly ash having a calcium oxide content of 60% by weight or more.

According to one aspect, the desulfurized gypsum may have a calcium oxide content of 50% by weight or more and a sulfur oxide content of 10% by weight or more.

According to one aspect, the fluorine-based additive is tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoro ethylene-fluoroalkyl vinyl ether copolymer (PFA), trifluoroethylene-ethylene copolymer (ETFE ), tetrafluoroethylene-hexafluoropropylene-vinylidenefluoride terpolymer (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF) and polychlorotrifluoroethylene (PCTFE) It may include one or more selected from the group consisting of.

According to one aspect, the water-soluble polymer is polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), polyethylene oxide (PEO), carboxyl methyl cellulose (CMC) , Starch, and polyacrylic acid (PAA) may include at least one selected from the group consisting of.

The slope stabilizer composition according to the present invention is a slope stabilization construction process, specifically, a process of incising a ton bag containing the slope stabilizer composition and pouring it out on a slope, mixing the slope stabilizer composition with existing soil, and By significantly reducing the amount of scattering dust generated during the compaction process, the work environment and surrounding environment of the constructor can be improved.

In addition, it has excellent compressive strength and durability without using cement, so it is possible to stabilize the slope for a long time, and at the same time, it is easy to vegetate, so it can show both safety and comfort.

1 is an image taken of a process of incising a tone bag containing a slope stabilizer composition prepared according to Example 2 and pouring it onto the top of a slope to be stabilized.
2 is an image taken of a process of incising a tone bag containing a slope stabilizer composition prepared according to Comparative Example 3 and pouring it onto the top of a slope to be stabilized.

Advantages and features of the present invention, and how to achieve them, will become clear with reference to the detailed description of the following embodiments. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. “And/or” includes each and every combination of one or more of the recited items.

Unless otherwise defined, all terms (including technical and scientific terms) used in this specification may be used in a meaning commonly understood by those skilled in the art to which the present invention belongs. When it is said that a certain part "includes" a component throughout the specification, this means that it may further include other components, not excluding other components unless otherwise stated. In addition, singular forms also include plural forms unless specifically stated in the text.

The present invention, based on 100 parts by weight of desulfurized gypsum, 10 to 40 parts by weight of blast furnace slag (slag); 40 to 70 parts by weight of fly ash; 10 to 40 parts by weight of paper ash; 15 to 55 parts by weight of a fluorine-based additive; And it provides a slope stabilizer composition comprising 10 to 40 parts by weight of a water-soluble polymer.

Typically, the slope stabilizer composition is configured to basically include cement in order to secure high compressive strength. When constructed on steep slopes or bedrock slopes using cement-based slope stabilizers, it shows excellent durability and slope stability, but there are environmental problems such as detection of heavy metals, and a large amount of scattering dust is generated during construction, resulting in poor working environments and surrounding environments. There are also problems that cause damage. In particular, there are also difficult problems in vegetation composition and activation due to high compressive strength.

The present invention relates to a cement-free slope stabilizer composition that does not use cement, and includes desulfurized gypsum, blast furnace slag, fly ash, paper ash, fluorine-based additives and water-soluble polymers in specific amounts, thereby enabling long-term slope stabilization and It can significantly reduce the amount of scattering dust and provide favorable conditions for the activation of vegetation.

The desulfurization gypsum refers to gypsum generated as a by-product during the flue gas desulfurization process. The desulfurized gypsum has rapid hydration crystallinity and can be demolded, transported, and processed in a short time, so it is suitable for mass production and has the advantage of being mixed with other materials and used as a composite material.

In the present invention, by using the above-described desulfurized gypsum as a main raw material, it is possible to minimize the environmental impact of industrial waste recycling. On the other hand, desulfurized gypsum is recognized as having no special hazards according to the recent Waste Management Act and is classified as general waste at the workplace.

In terms of sufficiently exhibiting initial strength without deteriorating workability, the desulfurized gypsum has a calcium oxide content of 50% by weight or more, preferably 50 to 70% by weight, and a sulfur oxide content of 10% by weight or more, preferably 10 to 70% by weight. It may be characterized as being 30% by weight. At this time, calcium oxide refers to Free-Ca0, and sulfur oxide refers to SO ₃ .

The fly ash refers to ash collected through a dust collector among ash generated while burning pulverized coal in a thermal power plant, and the fly ash has a fineness of 2500 to 6500 cm ² /g, It preferably has 3000 to 5000 cm ² /g, but may have an average particle diameter of 30 μm or less, preferably 10 to 25 μm.

40 to 70 parts by weight of the fly ash, preferably 45 to 68 parts by weight, more preferably 50 to 65 parts by weight, based on 100 parts by weight of the desulfurized gypsum. On the other hand, if the above-described range is out of range, even if the ratio of the above-described fly ash particles increases due to saturation, the initial strength increase effect is insignificant, or mixing with components other than fly ash is not uniformly performed.

The slope stabilizer composition according to an embodiment of the present invention may be characterized in that it includes high calcium fly ash. The high-calcium fly ash may be high-calcium fly ash generated in a process of maintaining a combustion temperature of about 850° C. and using a method such as ammonia spray in order to prevent the emission of nitric oxide in a small and medium-sized cogeneration plant.

The high-calcium fly ash has a Free-CaO content of 30% by weight or more, preferably 35 to 80% by weight, more preferably 50 to 70% by weight, an SO ₃ content of 1 to 10% by weight, and a fineness of 3000 to 4000 cm ² /g is advantageous.

As the high-calcium fly ash contains a large amount of calcium ions (Ca ²⁺ ), cation exchange occurs between the Ca ²⁺ and H ⁺ and Na ⁺ in the existing soil, resulting in a decrease in the diffuse double layer. may have an increasing effect.

The paper ash refers to ash collected after removing moisture from paper sludge generated in the process of producing paper and incinerating in an incinerator, and may include SiO ₂ , Al ₂ O ₃ and CaO as main components.

In terms of more efficiently expressing the strength increasing effect according to the above-mentioned cation exchange, the paper ash may include calcium-based paper ash generated during the neutral papermaking process. This calcium-based paper ash exhibits a synergistic effect with the high-calcium fly ash by including 30% by weight or more of Free-CaO, preferably 40 to 60% by weight, thereby significantly increasing durability according to the development of long-term strength.

To this end, it is advantageous to include 10 to 40 parts by weight of the paper ash, preferably 20 to 38 parts by weight, and more preferably 25 to 35 parts by weight, based on 100 parts by weight of the desulfurized gypsum.

The blast furnace slag is a by-product produced in a blast furnace (blast furnace) during pig iron manufacturing at a steel mill, and is used without limitation as long as it has a composition of 25 to 40% SiO ₂ , 5 to 20% Al ₂ O ₃ and 30 to 50% CaO. possible. When the above composition is satisfied, it is also possible to purchase and use a commercial product. Preferably, the blast furnace slag may have a composition of 30 to 35% of SiO ₂ , 10 to 15% of Al ₂ O ₃ and 40 to 45% of CaO, and it is preferable to use one having a loss on ignition (LOI) of less than 5 more preferable

10 to 40 parts by weight of the blast furnace slag, preferably 20 to 38 parts by weight, more preferably 25 to 35 parts by weight, based on 100 parts by weight of the desulfurized gypsum.

Under the above conditions, it is possible to reduce the water content of the existing soil and at the same time restrain the movement of soil particles in the existing soil, thereby expressing the effect of stabilizing the slope according to the increase in compressive strength. If it is out of the above-mentioned range, the compressive strength is too high, so it is not suitable for vegetation composition and activation described later, or there is a problem that the long-term strength expression and durability enhancement effect are insignificant. At this time, the existing soil refers to soil located on a slope where slope stabilization is performed through mixing and compaction with the slope stabilizer composition according to an embodiment of the present invention.

On the other hand, the blast furnace slag may be in a fine powder state, preferably a fine powder having an average particle diameter of less than 20 μm, more preferably 12 to 16 μm. Accordingly, economic feasibility is ensured and at the same time, the above-described strength expression is possible.

The fluorine-based additive may include a fluororesin, specifically, tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-fluoroalkylvinyl ether copolymer (PFA), trifluoroethylene -Ethylene copolymer (ETFE), tetrafluoroethylene-hexafluoropropylene-vinylidene fluoride terpolymer (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF) and polychlorotri It may include one or more selected from the group consisting of fluoroethylene (PCTFE).

The fluorine-based additive may be present in the form of nanofibers. That is, the fluorine-based additive in the form of nanofibers captures each particle constituting the above-described slope stabilizer composition, cuts the tone bag containing the slope stabilizer composition, pours it onto the slope, and scatters dust generated in the process of mixing and compacting with the existing soil. amount can be significantly reduced.

The fluorine-based additive may be converted into a nanofiber form by heat treatment in the process of mixing with each composition of the slope stabilizer described above. Specifically, the slope stabilizer composition in which the fluorine-based additive in the form of nanofibers having an average diameter of 1 to 1 mm, preferably 100 to 900 μm is uniformly dispersed by using the heat generated in the mixing process but performing an additional heat treatment process get it To this end, it is advantageous that the heat treatment is performed at 80 to 300° C., preferably 100 to 250° C. for 30 minutes to 2 hours.

By including 15 to 55 parts by weight, preferably 20 to 52 parts by weight, more preferably 35 to 50 parts by weight of the fluorine-based additive with respect to 100 parts by weight of the desulfurized gypsum, economic feasibility is secured, as well as scattering occurring during the above-described construction process. By reducing the amount of dust, the working environment and the surrounding environment can be improved.

The water-soluble polymer is polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), polyethylene oxide (PEO), carboxyl methyl cellulose (CMC), starch And it may include at least one selected from the group consisting of polyacrylic acid (PAA).

The slope stabilizer composition according to the present invention not only improves the fluidity of the composition by including the above-mentioned water-soluble polymer, but also increases the viscosity of the composition to prevent separation of each component, and due to its own adhesive strength, the slope to be constructed It can show excellent strength in the long term while improving the adhesion performance with the existing soil.

When the slope stabilizer composition containing the above-described water-soluble polymer is applied to a slope, mixed with existing soil, and then compacted, it is advantageous in terms of stabilizing vegetation because it can improve soil moisture retention and increase seed germination.

10 to 40 parts by weight of the water-soluble polymer, preferably 20 to 38 parts by weight, more preferably 25 to 35 parts by weight, based on 100 parts by weight of the desulfurized gypsum. When the above-mentioned range is exceeded, separation of each composition occurs due to a decrease in viscosity, which may affect initial strength expression and is uneconomical.

Meanwhile, the water-soluble polymer may have a number average molecular weight (Mn) of 1000 to 300,000 g/mol, preferably 3000 to 100,000 g/mol.

The slope stabilizer composition according to an embodiment of the present invention may include PVA as a water-soluble polymer.

Accordingly, while having excellent miscibility with the above-mentioned fluorine-based additives, the slope stabilizer composition reacts with moisture in the soil in the process of mixing and constructing with the existing soil to significantly reduce the generation of scattering dust while improving strength and durability. can make it

The slope stabilizer composition according to an embodiment of the present invention may further include an additive for curing. Specifically, the additive is selected from the group consisting of ethyl vinyl acetate, isobutyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, ethyl acrylate, magnesium chloride, potassium chloride, sodium chloride, calcium chloride, sodium sulfate and sodium silicate may contain one or more.

The slope stabilizer composition according to an embodiment of the present invention may be stored in a ton bag or the like. After pouring the slope stabilizer composition accommodated inside through the incision of the tone bag on the top of the slope to be stabilized, the slope stabilization construction work can be performed by mixing and compacting with the existing soil. At this time, it is preferable to mix and apply 2 to 20 parts by weight, preferably 4 to 18 parts by weight, more preferably 5 to 15 parts by weight of the slope stabilizer composition with respect to 100 parts by weight of the existing soil.

The mixing and compaction process may be performed using a compaction device, and the compaction device is not particularly limited as long as it is a compaction device commonly used in the art, but preferably a backhoe or the like can be used.

The slope coated with the slope stabilizer composition according to an embodiment of the present invention shows a compressive strength of 2.5 MPa or more and excellent durability even without using a cement composition. In particular, it is possible to significantly reduce the generation of droplet dust in the above-described tone bag cutting process and mixing/compacting process, thereby improving the working environment and surrounding environment of the operator.

In addition, the slope coated with the slope stabilizer composition according to an embodiment of the present invention is advantageous in stabilizing vegetation, so it is very suitable for slope stabilization as well as slope greening, and has the advantage of being reconstructed.

Hereinafter, the present invention will be described in detail through examples, but these are for explaining the present invention in more detail, and the scope of the present invention is not limited by the following examples.

Example

(Example 1)

A slope stabilizer composition was prepared with the composition shown in Table 1 below. Meanwhile, the free-CaO content in the fly ash and the paper ash was 10 wt% and 50 wt%, respectively, the free-CaO content in the desulfurized gypsum was 55 wt%, and the SO ₃ content was 25 wt%.

(Examples 2-3)

A slope stabilizer composition was prepared with the composition shown in Table 1 below. At this time, the free-CaO content in the fly ash and the paper ash was 65% by weight and 50% by weight, respectively, the free-CaO content in the desulfurized gypsum was 55% by weight, and the SO ₃ content was 25% by weight.

(Comparative Examples 1-2)

A slope stabilizer composition was prepared with the composition shown in Table 1 below. At this time, both the free-CaO content in the fly ash and the paper ash were 10% by weight, the free-CaO content in the desulfurized gypsum was 55% by weight, and the SO ₃ content was 25% by weight.

(Comparative Example 3)

A slope stabilizer composition was prepared using 80 parts by weight of gypsum, 80 parts by weight of quicklime, 15 parts by weight of fly ash, and 20 parts by weight of blast furnace slag based on 100 parts by weight of Portland cement. At this time, both the free-CaO content in the fly ash and the paper ash was 50% by weight, the free-CaO content in the desulfurized gypsum was 55% by weight, and the SO ₃ content was 25% by weight.

Furtherance Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 desulfurized gypsum 100 100 100 100 100 fly ash 45 57 57 45 45 Paper Ash 23 29 29 23 23 blast furnace slag 23 29 29 23 23 PVdF 30 43 43 - 30 PVA 23 29 - - - PVP - - 29 - - SBR - - - 23 -

In Table 1, the units of each composition are parts by weight, and Examples 1 to 3 and Comparative Examples 1 to 2 show the contents with respect to 100 parts by weight of desulfurized gypsum.

Evaluation Example 1: Evaluation of compressive strength

Compositions prepared according to Examples 1 to 3 and Comparative Examples 1 to 3 were divided into 3 layers in a φ10Х20 cm mold, minced and molded, 2d wet [20 ℃, 80% (RH)] + 5d water [20 ℃] + 21 d drying [20 ° C, 50% (RH)] curing was performed to prepare specimens for testing, respectively.

A compressive strength test was performed on the prepared specimen according to the KS F 2405 standard, and the results are shown in Table 2 below.

Evaluation Example 2: Length change rate evaluation

After preparing test specimens in the same way as in Evaluation Example 1, the length change of each specimen was measured according to the KS F 2424 standard, and the results are shown in Table 2 below.

Evaluation Example 3: Water absorption evaluation

After preparing the test specimen in the same way as in Evaluation Example 1, the water absorption was measured according to the KS F 2476 standard, and the results are shown in Table 2 below.

Compressive strength (MPa) Length change rate (%) Absorption rate (%) Example 1 2.8 0.05 0.90 Example 2 3.2 0.02 0.72 Example 3 3.1 0.08 0.81 Comparative Example 1 2.4 0.21 2.11 Comparative Example 2 2.2 0.11 2.34 Comparative Example 3 5.0 0.19 2.82

As can be seen in Table 2, in the case of the specimen prepared using the slope stabilizer composition prepared according to the embodiment of the present invention, excellent compressive strength was exhibited, and the length change rate and water absorption rate were also reduced, thereby suppressing or delaying the shrinkage reduction effect and deterioration. has the effect of

Specifically, in the case of Examples 2 and 3, which satisfy the most preferred content ranges presented in the present invention, it can be seen that they exhibit higher compressive strength and lower length change rate and water absorption rate than Example 1, which is not the case.

On the other hand, in the case of Example 3, it can be seen that the compressive strength was similar to Example 2 as PVP was used as the water-soluble polymer, but the length change rate and water absorption showed higher results than Example 2. These results suggest that in the slope stabilizer composition according to the present invention, PVA most effectively reduces the drying shrinkage and expansion phenomenon due to the inhibition of moisture evaporation inside the specimen.

In the case of Comparative Example 3, high compressive strength was exhibited, but due to excessively high compressive strength, it is determined that the composition and activation of vegetation would be difficult. On the other hand, since Examples 1 to 3 according to an embodiment of the present invention exhibited a compressive strength of 2.8 MPa or more, it is possible to provide sufficient strength for slope stabilization as well as advantageous conditions for the composition and activation of vegetation in the future.

Evaluation Example 4: Evaluation of scattering dust generation

The tone bag containing the slope stabilizer composition prepared according to Example 2 and Comparative Example 3 was cut and poured onto the top of the slope to be stabilized, and the amount of scattering dust generated at this time was photographed with a camera, and the results are shown in FIG. 1, respectively. and 2.

1 is an image result for the slope stabilizer according to Example 2, and FIG. 2 is an image result for Comparative Example 3, that is, a general cement-based slope stabilizer. In the case of Example 2, it can be seen that the amount of scattering dust is significantly reduced. there is. Accordingly, it is possible to improve the working environment of the operator as well as the surrounding environment.

Claims (5)

With respect to 100 parts by weight of desulfurized gypsum,
40 to 70 parts by weight of fly ash;
10 to 40 parts by weight of paper ash;
10 to 40 parts by weight of blast furnace slag;
15 to 55 parts by weight of a fluorine-based additive; and
A slope stabilizer composition comprising 10 to 40 parts by weight of a water-soluble polymer. According to claim 1,
The desulfurized gypsum has a calcium oxide content of 50% by weight or more and a sulfur oxide content of 10% by weight or more. According to claim 1,
The fly ash is a high calcium fly ash having a calcium oxide content of 60% by weight or more, a slope stabilizer composition. According to claim 1,
The fluorine-based additive is tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoro ethylene-fluoroalkyl vinyl ether copolymer (PFA), trifluoroethylene-ethylene copolymer (ETFE), tetrafluoro Ethylene-hexafluoropropylene-vinylidene fluoride terpolymer (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVdF) and polychlorotrifluoroethylene (PCTFE) selected from the group consisting of A slope stabilizer composition comprising one or more. According to claim 1,
The water-soluble polymer is polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), polyethylene oxide (PEO), carboxyl methyl cellulose (CMC), starch And polyacrylic acid (polyacrylic acid, PAA) containing at least one selected from the group consisting of, slope stabilizer composition.

Images