KR101253250B1 - Surface- treated soil paving material for preventing surface course stripping, and constructing method for the same - Google Patents

Abstract

Surface-treated soil pavement material and its manufacturing method which can reduce the surface peeling phenomenon of soil pavement material by rainwater by improving the surface erosion resistance by treating the surface by using acrylic mixed water dispersion polymer mixed material Is provided. Soil pavement surface treated to prevent surface peeling, solidified soil; An aqueous dispersion polymer, comprising: a soil binder mixed with a solidified soil to solidify the solidified soil; And an acrylic polymer comprising a surface reinforcing agent mixed with the surface of the solidified soil to be solidified by the soil binder to strengthen the surface of the solidified soil, wherein the mixed material of the acrylic polymer and the water-dispersible polymer is 10 to 50% by weight, respectively. A liquid type material mixed at a ratio, characterized in that it is installed or mixed on the surface of the solidified soil.

Description

Surface-treated soil paving material for preventing surface course stripping, and constructing method for the same}

The present invention relates to the surface treatment of the soil paving material (Soil paving material), and more specifically, to the surface treatment stripping (Surface course stripping) phenomenon due to rain (rainwater) and the like and the construction thereof It is about a method.

Soil pavement refers to pavement using cement or hardener in the surrounding soil such as granite weathered soil, unlike asphalt concrete and concrete pavement using existing aggregates. The soil pavement can be applied to a bicycle road, a parking lot, a road in a residential complex, a farm road, a walkway, a park plaza, and the like which have relatively low loads. In general, the main material of such soil pavement mainly uses portland cement, and other additives.

For example, the soil-cement mixed soil is made by mixing cement, soil, and water to be hard, and not as strong as concrete but serves to compact the ground, and is used for the construction of road ground or waterways. In particular, the soil-cement (Soil cement) is a stable treatment by mixing the cement in the roadbed (bed) or the roadbed (路 盤 路 盤) soil, the mixing amount of cement is mixed by about 5 to 15%. The soil cement is used as soil, water, and cement-based hardeners, and is defined as a structural material that is formed by compaction, and is a pavement material having durability by hardening a mixture by hydration of cement. The required strength can be obtained according to the amount of cement mixed, so it is economical and natural, so it is a natural material that can be harmonized with the surrounding environment. Although similar chemical processes occur, soil cement differs in general cement concrete and material concentrations, cement requirements, overall construction process, formulation and strength requirements.

When the soil cement is used, natural soil or masato is used as the solidification soil, so the construction cost is economical, the construction is simple and quick, and the strength increases as the solidification continues for a long time, and it is strong against acid and alkali. It has durability. In addition, it has a natural soil color, and because it excludes solar radiant heat, it has excellent natural environmental friendliness, and improves the use of natural resources according to the use of on-site soil, it is reduced to natural soil after degeneration has the advantages of pollution prevention and environmental conservation.

However, since these soil cements do not have a greater strength than conventional road pavements, studies are being actively conducted using special mixed materials to enhance the strength of soil cements. Currently, various solidifying agents have been developed and used in Japan. Recently, several products have been developed and used in Korea.

1 is a photograph showing a surface peeling phenomenon of a general soil pavement.

In the case of the soil cement mixed soil pavement, as shown in a) and b) of Figure 1, the surface peeling phenomenon occurs, in order to compensate for this, a study of increasing the cement mixing amount or using other additives to make high strength Most of them, and there is no research on surface treatment.

2 is a view for explaining the soil packaging material according to the prior art.

Referring to FIG. 2, the soil pavement 10 according to the related art may mix cement or solidifying agent 12 in a fixed ratio with the solidified soil 11 at a predetermined ratio. ) Put a weight ratio of about 15% or more to mix with water (13) can be used to compact the voltage. Since the soil pavement 10 according to the prior art only emphasizes uniaxial compressive strength, there is no technique for surface treatment yet.

When the soil pavement 10 according to the prior art is formed of the soil cement mixed material, the soil 11 and the cement or the hardening agent mixed material 12 are added to the cement content by 15% or more, and are vulnerable to freezing and thawing. Has a problem. The soil pavement 10 according to the prior art has properties similar to concrete, for example, when the cement (12) content is added to 15% or less, the surface layer eroded by rain (rain) or falling off the surface There is a problem that peeling phenomenon occurs. Accordingly, there is a problem that the soil cement mixed material is difficult to use for a long time as a soil pavement.

1) Republic of Korea Registered Patent No. 10-0954341 (application date: May 28, 2009), the name of the invention: "Soil packaging composition and method for constructing soil packaging using the same" 2) Republic of Korea Patent No. 10-0951032 (application date: June 09, 2008), the title of the invention: "Soil-polymer-cement concrete composition using the principle of polymer cement concrete" 3) Republic of Korea Patent No. 10-0784359 (filed April 17, 2006), the title of the invention: "Resin composition for improving the surface properties and construction method thereof" 4) Republic of Korea Patent Registration No. 10-0359266 (Application Date: June 09, 2001), the title of the invention: "Eco-Based method of composition" 5) Republic of Korea Patent Publication No. 2002-0075985 (published: October 09, 2002), the title of the invention: "Road surface layer construction method by the solidified soil method"

The technical problem to be solved by the present invention for solving the above-described problems, the soil packaging material using the acrylic mixed water dispersion-based polymer mixed material to reduce the surface peeling phenomenon by Rainwater and the like and its manufacturing method It is to provide.

Another technical problem to be solved by the present invention for solving the above problems is to improve the uniaxial compressive strength of the soil pavement, and to prepare a soil pavement treated with a surface to improve the freeze thawing and durability of the soil pavement and its manufacture It is to provide a method.

As a means for achieving the above-described technical problem, the soil pavement surface treated for preventing the surface peeling according to the present invention, the solidified soil; An aqueous dispersion polymer comprising: a soil (including stone powder) binder mixed with the solidified soil to solidify the solidified soil; And an acrylic polymer comprising a surface reinforcing agent mixed with the surface of the solidified soil to be solidified by the soil binder to strengthen the surface of the solidified soil.

Here, the mixed material of the acrylic polymer and the water-dispersible polymer is a liquid material, respectively, may be installed or mixed on the surface of the solidified soil.

Here, the acrylic polymer which is the surface strengthening agent may be composed of a compound of components such as methyl acrylate, ethyl acrylate, isobutyl acrylate, methyl methacrylate, ethimethacrylate and acrylonitrile.

Here, the acrylic polymer has physical properties of solid content (%) of 35-41, pH (25 ° C) of 7-91, surface tension (dyne / cm) of 40-50, and viscosity (cps) of 20-60. It may be an acrylic emulsion.

Here, the water-dispersed polymer as the soil binder may be SB (Styrene-Butadiene) latex having a glass transition temperature (Tg) and a minimum film formation temperature (MFFT) of 0 to 10 ° C.

On the other hand, as another means for achieving the above-described technical problem, the construction method of the surface treatment of the soil pavement to prevent surface peeling according to the present invention, a) can be solidified by solidifying the target soil by using a water-dispersible polymer as the soil binder Forming a dispersed polymer soil pavement; And b) laying or mixing the surface-treated soil pavement on the water-dispersible polymer soil pavement, wherein the surface-treated soil pavement of step b) includes an acrylic polymer and a water-dispersible polymer that are liquid materials. It is characterized in that it is formed on the surface of the soil or mixed.

Herein, the water-dispersible polymer is a soil binder which is mixed with the solidified soil to solidify the solidified soil, and the acrylic polymer is mixed with the surface of the solidified soil which is solidified by the soil binder to strengthen the surface of the solidified soil. May be a surface enhancer.

Here, the acrylic polymer has physical properties of solid content (%) of 35-41, pH (25 ° C) of 7-91, surface tension (dyne / cm) of 40-50, and viscosity (cps) of 20-60. It may be an acrylic emulsion.

Here, the water dispersion polymer may be SB (Styrene-Butadiene) latex having a glass transition temperature (Tg) and a minimum film formation temperature (MFFT) of 0 to 10 ° C.

According to the present invention, it is possible to reduce the surface peeling phenomenon of the soil pavement material by Rainwater or the like by treating the surface by using the acrylic mixed water dispersion polymer mixed material to improve the surface erosion resistance.

According to the present invention, the uniaxial compressive strength of the soil pavement can be improved by mixing an inorganic additive (including sodium series) with the acrylic mixed water dispersion polymer mixed material, and the freeze-thawing and durability of the soil pavement can be improved.

1 is a photograph showing a surface peeling phenomenon of a general soil pavement.
2 is a view for explaining the soil packaging material according to the prior art.
Figure 3 is a view for explaining the surface treated soil pavement to prevent surface peeling according to an embodiment of the present invention.
Figure 4 is a view for explaining the soil pavement surface treated with an acrylic mixed water dispersion polymer mixed material to prevent surface peeling according to an embodiment of the present invention.
5 is a view for explaining a method of testing the erosion of the soil pavement surface treated for preventing the surface peeling according to an embodiment of the present invention.
Figure 6 is a view illustrating a uniaxial compressive strength test specimen and test equipment of the surface treated soil pavement to prevent surface peeling according to an embodiment of the present invention.
7 is a view for explaining a method of measuring the indirect tensile strength of the soil pavement surface treated to prevent surface peeling according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, except to exclude other components unless otherwise stated.

As an embodiment of the present invention, there is provided a soil pavement material and a method for constructing the same, which can improve the surface erosion resistance by laying or mixing a material formed by mixing a material of an acrylic polymer and a water-dispersible polymer on a soil pavement surface, and furthermore, There is provided a soil pavement having a strength and durability capable of supporting a load, and a construction method thereof.

3 is a view for explaining the surface of the soil packaging material for preventing the surface peeling according to an embodiment of the present invention, Figure 4 is an acrylic mixed water dispersion polymer mixed material for preventing surface peeling according to an embodiment of the present invention It is a figure for demonstrating the surface treatment soil pavement material.

3 and 4, the soil packaging material according to an embodiment of the present invention is largely made of a water-based polymer soil packaging material 110 and a surface-treated soil packaging material 120, the water-based polymer soil packaging material 110 Includes a solidified soil 111, a soil binder 112, and water 113, and the surface treated soil pavement 120 is a solidified soil 121, a soil binder 112, and a surface reinforcing agent 113. In this case, the soil binder (112, 122) may be a water-based polymer, specifically SB (Styrene-Butadiene) latex, the surface enhancer 113 may be an acrylic polymer, specifically, an acrylic emulsion. .

Soil pavement according to an embodiment of the present invention may be constructed in the form of laying or mixing the soil pavement 120 surface-treated on the water-based polymer soil pavement 110. That is, the solidified target soil 111 is solidified by using the water-dispersed polymer as the soil binder 112 to form the water-dispersible polymer soil packaging material 110, and then, the surface-treated soil packaging material 120 is formed by the water-dispersed polymer soil. It is laid or mixed on the packaging material 110, wherein the surface-treated soil packaging material 120 is a mixed material in which the acrylic polymer 123 and the water-dispersible polymer 122 are mixed at a ratio of 10 to 50% by weight, respectively. Is installed on the surface of the solidified soil 121 or mixed.

Here, the solidified soils 122 and 121 may be natural soil or masato. In addition, the soil binders 112 and 122 are water-dispersible polymers that are soil hardeners and solidify the solidification target soil 121.

In addition, the surface strengthening agent 123 is an acryl-based polymer, and will strengthen the surface of the solidified soil 121 solidified by the soil binder 122. At this time, the surface enhancer 123 is preferably an acrylic emulsion.

Surface-treated soil pavement 120 according to an embodiment of the present invention is a liquid-type material of 10 to 50% by weight of each of the acrylic polymer and the water-dispersed polymer material is laid or mixed on the surface of the solidified soil 121 The surface erosion resistance of the soil pavement may be increased. Hereinafter, the surface treated pavement 120 according to the embodiment of the present invention will be described in detail.

First, a polymer is an extract of a petrochemical process, and a monomer, an emulsifier, and a polymerization initiator are made of a polymer by reacting in a reactor, and the polymer may vary in kind depending on the type of monomer, emulsifier, and polymerization initiator. . As a mixture of general concrete and waterproofing materials, urethane and epoxy are widely used. However, since the polymer used in the soil has a lot of influence on the moisture of the soil, water solubility is suitable, and it is preferable to use acrylic latex, which is an acrylic polymer having weather resistance.

Although such acryl-based latex has excellent weather resistance, although the bonding strength with the adherend is lower than that of SB (Styrene-Butadiene) latex, it is mainly used in a special field where weather resistance is required. The acrylic latex is provided in the form of an acrylic emulsion, which originally refers to the copolymer latex of methacrylic ester and acrylic ester. However, in recent years, the meaning is expanded, and even if the hard component monomer is other than methacrylic acid ester, when acrylic ester is copolymerized as the soft component monomer, it is called acrylic latex. Specifically, methyl methacrylate (MMA), ethyl (EA), butyl (BA) or oxyl (2-ethylhexyl) acrylate (EHA) is used as a hard monomer of acrylic latex in a broad sense. As unsaturated carboxylic acid, acrylic acid (AA), metacrylic acid (MAA) or itaconic acid (IA) is used.

Such acryl-based latex, in particular, the acrylic emulsion, which is a 100% acrylic polymer, has excellent characteristics in that it does not deteriorate or discolor badly even after long-term outdoor sun exposure. In addition, the copolymer with the higher acrylate (excellent) water resistance and alkali resistance, but because the price is expensive, the styrene-acryl copolymer is economically improved in consideration of the cost. However, when styrene is selected as the hard monomer, water resistance and alkali resistance are improved, but yellowing tends to occur when exposed to ultraviolet rays.

Such acrylic emulsions are prepared by emulsion polymerization at atmospheric pressure. At this time, the emulsion polymerization may proceed smoothly using any of the negative (-) ion activator or anionic / non-ionic activator as the emulsifier. That is, the emulsion polymerization of the nonionic activator alone uses anionic activators or anionic / nonionic blend activators because the selection of an appropriate Hydrophilic-Lipophilic Balance (HLB) is quite difficult. Here, the HLB refers to an index that varies depending on the ratio of the nature and the amount of the hydrophilic and hydrophobic groups of the surfactant.

The particle diameter and particle diameter distribution of the acrylic emulsion thus produced can be adjusted not only by the emulsifier but also by the polymerization method. For example, since monomers for forming an acrylic emulsion have many malodors, even when a small amount of monomers remain, there is a problem in handling later. Therefore, after the emulsion polymerization is completed, it is preferable to add a small amount of redox-based polymerization initiator or to remove the trace amount of monomer by cooking under reduced pressure.

The maximum property of such an acrylic polymer is excellent weather resistance. For example, although the tensile strength of an acrylic latex film changes with the exposure time, the increase means the formation of a crosslinked structure. Such acryl-based polymers may be composed of a compound of components such as methyl acrylate, ethyl acrylate, isobutyl acrylate, methyl methacrylate, ethimethacrylate and acrylonitrile.

When the acrylic polymer is used as a single binder, since the viscosity may be too thin to be difficult to use, when the acrylic acid is polymerized, an alkali is added to the acrylic emulsion to increase the pH to increase the viscosity. This type of emulsion is widely used as a binder for fibers, powders and paints. Alternatively, if a large amount of molecular weight is added in the monomer and the degree of polymerization is controlled, the polymer becomes viscous polymer without being completely hardened. Thus, a viscous polymer can be made after drying, which can be used for adhesion. Therefore, in the soil pavement according to an embodiment of the present invention, it is preferable to use the latter method for the role of the sole binder, the effect of the soil particle coating, and the prevention of hardening shrinkage of the solidified material.

In addition, the soil particle binder 122 according to an embodiment of the present invention uses SB latex, which is a water-based polymer having excellent binding force between soil particles, and, for example, Tg (Glass Transition Temperature) is about -11 to 9 ° C. SB latex having physical properties is used, in which SB latex has physical properties as shown in Table 1 below.

This SB latex is milky liquid state, in which small particles of organic polymer (small diameter of 0.5 ~ 5㎛) like colloid are dispersed in water, and the surface is coated with surfactant and floating in water. . Such SB latex is characterized by the composition of the polymer, generally styrene-butadiene, polyvinyl chloride (Polyvinyl Chloride), ethylene-vinyl acetate emulsion (Ethylene-Vinyl Acetate Emulsion), polyvinyl acetate (Polyvinyl-acetates) etc. can be suitably synthesized.

In addition, the surface reinforcing agent 123 according to the embodiment of the present invention is to prevent the detachment of the soil particles on the surface of the soil packaging material, as described above, using an acrylic emulsion excellent in weather resistance, as shown in Table 2 below It has the same physical properties.

On the other hand, in the soil pavement according to an embodiment of the present invention, the acrylic polymer can be used by adjusting the amount according to the moisture content of the soil, wherein, the general water content ratio of the soil pavement operation including the solidifying agent, additives, etc. Since it is adjusted to 10 to 15% of the weight, the acrylic polymer can also be used fixedly. In the case of the soil pavement according to an embodiment of the present invention, it is possible to use 1 m 3 of Masato, 250 kg of hardener, 15 kg of acrylic polymer, and water adjusted to 10-15% of soil weight according to the water content, but not limited thereto. It doesn't happen.

In the soil pavement material according to an embodiment of the present invention, when the target soil 121, the water-dispersible polymer solidifying agent 122, and the acrylic emulsion 123 are mixed, the hydration reaction by water proceeds and at the same time high density between the soil particles. Filling proceeds. As a result, deformation and fusion of the particles occur, and afterwards, the strength and elasticity are increased while forming the granules surrounding the soil particles, thereby preventing hardening shrinkage by the hardening agent. Therefore, since the polymer film is formed in the soil pavement according to the embodiment of the present invention, the resistance to freezing and thawing is improved, thereby significantly improving the erosion resistance as compared to the conventional soil pavement.

In addition, the surface treated soil pavement according to an embodiment of the present invention, may be mixed with an inorganic additive to improve the uniaxial compressive strength or more.

As a result, the soil pavement material according to the embodiment of the present invention, as described later in the following experimental examples, by laying or mixing the liquid-type material in which the acrylic polymer and the water-dispersible polymer material are mixed at a constant ratio, respectively, by the surface or the surface of the soil pavement, Erosion resistance can be improved by more than 15%, and also by mixing the inorganic additives to improve the uniaxial compressive strength of 100kgf / ㎠ or more, it is possible to improve the freeze-thawing durability by 20% or more.

Experimental Example

Hereinafter, with reference to Figures 5 to 8, will be described an experimental example for the surface treatment of the soil pavement to prevent surface peeling according to an embodiment of the present invention. That is, the soil pavement surface treated in order to prevent surface peeling according to an embodiment of the present invention by performing an erosion test to control the surface peeling phenomenon to analyze the characteristics of the surface treatment, uniaxial with respect to the selected compounding ratio Compressive strength, indirect tensile strength and freeze thawing tests were performed.

Erosion Degree Test

5 is a view for explaining a method of testing the erosion of the soil pavement surface treated for preventing the surface peeling according to an embodiment of the present invention.

The test related to the erosion degree of the soil pavement is not defined in the test standard, but the experimental method for evaluating the erosion degree in the experimental example of the present invention was applied as follows.

Referring to FIG. 5, a method of evaluating the degree of erosion by dropping a predetermined amount of water on a specimen at a predetermined height and quantifying the amount of specimen erosion was used. In this experiment, 1,500 mL of water was dropped equally over an hour at 90 cm height for all specimens. For example, since the number of drops of water is 20 drops / ml, the drop of water falling into the chamber by adjusting the clamp is accurately fixed to 8.3 drops / sec as shown in Equation 1 below.

Thus, when the number of drops falling in the chamber is fixed, the amount of water falling on the specimen through the tube is also fixed. At the bottom of the water drop, the beaker (5ℓ) is large enough to allow the specimen to fully enter, and then completely dried and left. The small size beaker to support the specimen is also washed, completely dried, and turned over. At this time, the role of the small beaker to support the specimen is to prevent the specimen from submerging when the water of 1,500ml runs out. However, if it is too large, the water dropped on the specimen will splash out of the large beaker, so be sure to leave the beaker (250 ml) of the appropriate size in consideration of this. After running out of water, rinse 50 ml of water with water and rinse out the water-prone specimen before it dries again. At this time, be careful not to damage the specimen due to the rinsing water, and the rinsed water is dropped through the tube and collected together with the water collected in the large beaker to measure the amount of suspended solids. At this time, the amount of water is 1,500 ml dropped from the top, so all the same. When measuring the amount of suspended solids, the solids on the large and small beakers should be rinsed cleanly together. By comparing the amount of suspended solids (mg / L) measured in this way, the erosion degree of each specimen can be evaluated.

Here, the specimens to be used in the erosion test was produced in the same manner as the specimens used in the uniaxial compressive strength test of FIG. 6, which will be described later, and after the age of 1 day, 3 days, 7 days, respectively, 4 cm above and below Each sample was cut into pieces and only 6 cm was used as a sample.

As a result, the surface treated soil pavement to prevent surface peeling according to an embodiment of the present invention, the surface erosion resistance improved by about 15% compared to the surface untreated soil pavement.

Uniaxial compressive strength  exam

Figure 6 is a view illustrating a uniaxial compressive strength test specimen and test equipment of the surface treated soil pavement to prevent surface peeling according to an embodiment of the present invention.

Referring to Figure 6, the uniaxial compressive strength characteristics were tested by soil uniaxial compression test method (KS F 2314). This test finds one-way uniaxial compressive strength of a test specimen that is self-supporting under no restraint pressure. The shape of the test specimen (test specimen), as shown in a) of FIG. 6, was made into a cylinder, a diameter of 10 cm and a height of 15 cm, and the measuring equipment was carried out with Instron 8521S. Uniaxial compressive strength test equipment, as shown in b) of Figure 6, may be composed of a deformation-controlled compression device, a load gauge and a displacement gauge.

Specifically, the uniaxial compressive strength measurement gave a compressive strain of up to 20% of the test specimen, and maintained a constant speed for compressive loading. The compressive force can be measured at a tolerance of 1% of the maximum compressive force of the test specimen. The amount of compression can be measured at a tolerance of% 0.1% of the height of the test specimen. The displacement meter is a displacement meter with a measuring range of 20 mm or more and a minimum division of 1/100 mm. In addition, the displacement gauge and the load gauge were implemented at a rate in which compression deformation of 1% per minute occurred.

와 압축력 P를 측정하고, 압축력의 최대값의 2/3 정도로 감소하거나 압축변형이 20%에 도달하면 압축을 종료하였다. 이에 따라 시험체의 일축압축 변형은 다음의 수학식 2에 따라 산정하였다.Therefore, the amount of compression during compression

And compression force P were measured, and compression was terminated when the compression force decreased to about 2/3 of the maximum value or the compression deformation reached 20%. Accordingly, the uniaxial compression deformation of the test specimen was calculated according to the following equation (2).

는 시험체의 압축변형(%)을 나타내고,

는 압축량을 나타내며,

는 초기 시험체의 높이(㎝)를 나타낸다.here,

Denotes the compressive strain (%) of the test specimen,

Represents the amount of compression,

Represents the height (cm) of the initial test body.

일 때의 압축응력은 다음의 수학식 3에 따라 산정하였다.Next, the compression deformation

The compressive stress at the time was calculated according to the following equation (3).

는 압축응력, P는 압축변형이

일 때, 시험체에 작용된 압축력을 각각 나타낸다. 이때, A₀은 초기 시험체의 단면적이고, D₀은 초기 시험체의 지름을 각각 나타낸다.Where A ₀ is given by (πD ₀ ² ) / 4

Is the compressive stress, P is the compressive strain

In this case, the compressive force applied to the test object is shown. At this time, A ₀ is the cross section of the initial test body, and D ₀ represents the diameter of the initial test body, respectively.

As a result, the surface treated soil pavement to prevent surface peeling according to an embodiment of the present invention, the uniaxial compressive strength of 100kgf / ㎠ or more compared to the surface untreated soil pavement.

Indirect tensile strength  exam

7 is a view for explaining a method of measuring the indirect tensile strength of the soil pavement surface treated to prevent surface peeling according to an embodiment of the present invention.

Referring to FIG. 7, the indirect tensile strength test is performed according to KS F 2376 and applied to obtain the indirect tensile strength according to the fracture load of the specimen required for the recovery elastic modulus test.

The tester can be subjected to load oscillation at a load frequency, duration and a certain level of load. The device can measure a horizontal strain of 0.25 μm strain and the load must be measured, recorded or accurately calibrated before testing. The recording device should be capable of recording a load frequency of at least 1.0 kHz. At this time, the load is measured by an electronic load cell complying with the requirements specified for the load measurement. The specimen is loaded using a metal rod with a concave surface having a radius of curvature equal to the nominal radius of the specimen.

At this time, the specimens were generally 100 mm or 150 mm in diameter, and the width of the metal rod was 13 mm or 19 mm, respectively, for these specimens. The corners of the metal rods were rounded by grinding to prevent damage to the test specimen.

In the test method using the test apparatus shown in FIG. 7, first, the specimen is placed in a temperature control device and adjusted to a predetermined test temperature. If no temperature is indicated and the actual temperature is unknown, the specimen should be stored for at least 6 hours at the specified temperature before testing. The specimen is placed on the load-bearing device and the metal rod is centered on the vertical plane through the diameter of the specimen. If necessary, it should be adjusted or balanced by an electronic measuring device. At this time, the loading speed of the indirect tensile test is 50mm / min at 25 ℃. Load at the specified loading rate and measure the maximum load until the specimen is destroyed.

Therefore, the indirect tensile strength was calculated as shown in Equation 4 using the fracture load value obtained through the test.

= 간접인장강도(MPa)를 나타내고, P는 작용 하중(N)을 나타내며, h는 공시체 높이(㎜)를 나타내고, D는 공시체 지름(㎜)을 각각 나타낸다.here,

= Indirect tensile strength (MPa), P represents the working load (N), h represents the specimen height (mm), D represents the specimen diameter (mm), respectively.

At this time, the indirect tensile strength test device is Instron's 8509 universal load tester, the stress and deformation control is automatically adjusted, the maximum load is 10tons. In the embodiment of the present invention, an indirect tensile strength test was performed by giving an axial deformation of 50.8 mm per minute by a strain control method.

As a result, the surface treated soil pavement to prevent surface peeling according to an embodiment of the present invention, the indirect tensile strength of 30% or more compared to the surface pavement untreated.

Freeze thawing test Freezing and Thawing Test )

The freeze thaw test repeated freezing and thawing of specimens prepared by the compaction test to measure soil pavement loss, water content change, and volume change (expansion and shrinkage). In order to reduce the deviation of specimens, the specimens were prepared by using a turning compactor. Freezing was performed at −20 ° C. for 24 hours, and melting was performed at 21 ° C. for 23 hours, and a nonwoven fabric was used instead of absorbent felt paper. This freeze-thawing specimen was tested at a rate of 50.8 mm / min using an Instron 8509 Universal Loading Tester.

Therefore, the changes in the volume and water content of the specimen and the loss of soil pavement are as follows.

First, the volume difference when molding the first specimen and the volume after molding were calculated as a percentage of the initial volume. Next, the moisture content at the time of shaping | molding a 1st specimen and the water content after shaping | molding were computed as a percentage of the dry specimen mass. That is, the modified furnace dry mass of the second specimen was calculated according to Equation 5 for the water in which the water-dispersible polymer and the soil acted during the test period and the water remaining in the specimen at (105 ㅁ 5) ° C.

Here, A is the furnace dry mass (g) after drying at 110 ° C, and B represents the percentage of water remaining in the specimen + 100.

In Equation 5, the percentage of the amount of water remaining after the drying of the (105 W 5) ° C. on the second specimen is equal to the amount of water remaining on the first specimen. The soil pavement loss of the second specimen expressed as a percentage of the initial furnace dry mass of the specimen was calculated by the following equation (6).

Where A is the furnace dry mass initially calculated minus the last corrected furnace dry mass and B represents the furnace dry mass initially calculated.

As a result, the soil pavement surface treated for preventing the surface peeling according to the embodiment of the present invention, 20% or more durability is improved compared to the unpaved soil pavement.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

110: waterborne polymer soil packaging
111: Target of the Soil
112: soil binder (water dispersion polymer)
113: water
120: surface treated soil pavement
121: Solidified Soil
122: soil (including stone) binder (water dispersion polymer)
123: surface strengthening agent (acrylic emulsion)

Claims (9)

Solidified soil;
An aqueous dispersion polymer comprising: a soil (including stone powder) binder mixed with the solidified soil to solidify the solidified soil; And an acrylic polymer comprising a surface reinforcing agent which is mixed with the surface of the solidified soil to be solidified by the soil binder and reinforces the surface of the solidified soil. The method of claim 1,
The mixed material of the acrylic polymer and the water-dispersible polymer is a liquid material, the soil pavement surface treated to prevent surface peeling, characterized in that it is installed or mixed on the surface of the solidified soil. The method of claim 1,
The acrylic polymer, which is the surface strengthening agent, is characterized in that it is made of a compound of components of methyl acrylate, ethyl acrylate, isobutyl acrylate, methyl methacrylate, ethimethacrylate and acrylonitrile. Soil pavement for surface treatment. The method of claim 3,
The acrylic polymer has an acrylic emulsion having a solid content of 45 to 46 (%), a pH of 7 to 91 (25 ° C), a surface tension of 40 to 50 (dyne / cm), and a viscosity of 200 to 500 (cps). Soil pavement surface-treated to prevent surface peeling, characterized in that. The method of claim 1,
The soil-based polymer, which is the soil binder, has a surface transition soil packaging material for preventing surface peeling, wherein the glass transition temperature (Tg) and the minimum film form temperature (MFFT) are 0 to 10 ° C. . a) solidifying the solidified soil using the water-dispersible polymer as the soil binder to form a water-dispersible polymer soil package; And
b) laying or mixing the surface treated soil pavement on the water-dispersible polymer soil pavement,
The surface-treated soil pavement of step b) is a method of constructing a soil pavement surface treated to prevent surface peeling, characterized in that the liquid-based material acrylic polymer and water-dispersible polymer is formed or mixed on the surface of the solidified soil. . The method according to claim 6,
The water-dispersible polymer is a soil binder which is mixed with the solidified soil to solidify the solidified soil, and the acrylic polymer is mixed with the surface of the solidified soil which is solidified by the soil binder to strengthen the surface of the solidified soil. A method of constructing a soil pavement surface treated to prevent surface peeling, characterized in that the reinforcing agent. The method of claim 7, wherein
The acrylic polymer is an acrylic emulsion having physical properties of 35 to 41 solid content (%), 7 to 91 pH (25 ° C), 40 to 50 surface tension (dyne / cm), and 20 to 60 viscosity (cps) Construction method of the surface treatment soil packaging material for preventing surface peeling, characterized in that the. The method of claim 7, wherein
The water-dispersible polymer is a method of constructing a soil pavement surface treated to prevent surface peeling, characterized in that the glass transition temperature (Tg) is -11 ~ 9 ℃ SB (Styrene-Butadiene) latex.

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