KR102687624B1 - A grouting composition and method of composition for grouting method - Google Patents

Abstract

The grout composition according to the present invention and the manufacturing method of the grouting construction composition containing the same, as well as the grouting construction method using the same, can improve construction stability by enabling real-time response to heterogeneous ground through adjustment of the composition ratio, and can improve construction stability by adjusting the composition ratio. Penetration can be increased by applying various base cements. In addition, constructability can be improved by adjusting the gel time according to site conditions, and the stability of heterogeneous strata can be improved by increasing initial strength. Here, by adjusting the composition ratio according to the construction method, the curing time can be shortened and the backflow of the grouting injection material can be prevented, thereby shortening the working period and improving quality.

Description

Grout composition and method for producing a grouting composition containing the same {A grouting composition and method of composition for grouting method}

The present invention relates to a method of manufacturing a grout composition and a composition for grouting construction containing the same. In detail, it is possible to improve stability by enabling real-time response to heterogeneous ground, and by adjusting the gel time according to field conditions. It relates to a grout composition that can increase work efficiency and improve the stability of heterogeneous strata, and a method of manufacturing a grouting composition containing the same.

Grouting refers to a method of forcibly injecting or filling a mixture of cement, fine aggregate, etc. into the cracks of a structure, rock cracks, or inside the stratum to increase structural stability and the bearing capacity of the ground or to restore the cross section.

The fields to which grouting is applied are gradually expanding, including the lower part of nuclear power plant containment structures, lower track slabs, bridge supports, bridge expansion joint fillers, repair and reinforcement injection of various structures, fillers for fixing anchor bolts, joints of rebar, precompact concrete, It is widely applied to PC tension and heavy machine supports, and accordingly, the quality and performance of the grout materials used are also required to be high quality and high performance.

In order for grouting to function properly, the grout material must have the following basic properties: The basic performance requirements of grout materials are: first, shrinkage (settlement), bleeding, material separation, etc. should not occur; second, it should have excellent fluidity and fillability; third, it should exhibit the strength required in the field where it is applied; and fourth, , It must be highly durable and capable of long-term use.

In order to secure the above physical properties, various technologies and materials are applied. A fluidizing agent is used to ensure the fillability and fluidity of the grout, and a water reducing agent is used to develop strength to reduce the quantity used. .

Grout materials secure basic physical properties using cement as their main ingredient, but the biggest drawback of cement-based materials is that their volume decreases as they harden over time after pouring. If shrinkage occurs after placing the grout material, the adhesion surface decreases, the adhesion surface becomes discontinuous, cavities or gaps occur inside the structure, which prevents the grout from performing its function, ultimately greatly reducing the durability of the structure. A problem arises.

Therefore, it can be said that non-shrinkage performance is the most important in grout, and an expanding agent or expansion material is used to ensure the non-shrinkage performance of the grout material.

Conventionally used expansion agents have mainly been metal powder expansion agents, calcium sulfo aluminate expansion agents, gypsum expansion agents, and shrinkage reducing agents composed of ionic or nonionic surfactants.

However, in the case of conventional metal powder expansion agents, very small amounts are used, so it is difficult to evenly disperse and mix them within the grout material. If they are not properly distributed, unequal shrinkage and expansion may occur at the beginning of pouring, making it difficult to reverse. There was a problem that led to an inevitable defect.

And since shrinkage of the grout material occurs a lot in the early stages after pouring, and shrinkage occurs continuously as it hardens, it is necessary to prevent not only the initial shrinkage of the grout material but also long-term shrinkage. The conventional calcium sulfoaluminate-based expansion material is There was a problem with not properly compensating for contraction.

Republic of Korea Patent No. 10-1604378 (March 11, 2016)

The present invention was developed to solve the above problems. Specifically, it can improve stability by enabling real-time response to heterogeneous ground, and can increase work efficiency by adjusting the gel time according to field conditions. The purpose of the present invention is to provide a grout composition that can improve the stability of heterogeneous strata and a method of manufacturing a grouting composition containing the same.

The present invention relates to a grout composition and a method for producing a grouting composition comprising the same.

One aspect of the present invention is a grout composition with improved water resistance, reinforcement, and earthquake resistance. The composition includes 100 parts by weight of cement, 0.1 to 5 parts by weight of a fluidizing agent, 1 to 50 parts by weight of a plastic compound, and 0.1 to 0.5 parts by weight of a thickener, , the composition relates to a grout composition with improved water resistance, reinforcement, and seismic performance, characterized in that the brain fineness is 3,000 to 9,000 c㎡/g.

In the present invention, the firing compound may include crushed clinker containing 10 to 50 parts by weight of lime, 10 to 30 parts by weight of gypsum, and 10 to 50 parts by weight of bauxite, based on 100 parts by weight of cement.

In addition, the composition may further include 1 to 30 parts by weight of blast furnace slag based on 100 parts by weight of cement, and the fluidizing agent is any one selected from formaldehyde-based, naphthalene-based, melamine-based, lignin-based, and polycarboxylate-based. Or it is plural, and is characterized by a solid content of 45% by weight or more, an SO ₄ ^2- content of 15% by weight or less, a ^CI- content of 0.5 ppm or less, a pH of 7.5 to 11, and a specific gravity of 1.1 to 1.3 g/ml.

Another aspect of the present invention is a method of manufacturing a composition for grouting construction using the grout composition according to the above, which includes: a) mixing 10 to 150 parts by weight of the grout composition with 100 parts by weight of water to prepare a first composition; steps; b) preparing a second composition containing an aqueous silica solution, a rapid setting agent, or a mixture thereof; and c) mixing the first composition and the second composition.

In the present invention, the aqueous silica solution contains 10 to 500 parts by weight of a silicate compound based on 100 parts by weight of water, and the rapid setting inhibitor is an acrylic acid monomer, a polyethylene glycol-monomethyl ether-(meth)acrylate monomer, and a monomer having a propyloxy group. It contains a polymer, and the first composition further contains 5 to 20 parts by weight of bentonite.

Another aspect of the present invention is a grouting construction method using a composition for grouting construction manufactured by the production method according to the above.

The grout composition according to the present invention and the manufacturing method of the grouting construction composition containing the same, as well as the grouting construction method using the same, can improve construction stability by enabling real-time response to heterogeneous ground through adjustment of the composition ratio, and can improve construction stability by adjusting the composition ratio. Penetration can be increased by applying various base cements. In addition, constructability can be improved by adjusting the gel time according to site conditions, and the stability of heterogeneous strata can be improved by increasing initial strength. Here, by adjusting the composition ratio according to the construction method, the curing time can be shortened and the backflow of the grouting injection material can be prevented, thereby shortening the working period and improving quality.

Hereinafter, the grout composition according to the present invention and the manufacturing method of the grouting composition including the same and the composition for grouting construction according to the present invention will be described in more detail through specific examples or examples. However, the following specific examples or examples are only a reference for explaining the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Additionally, unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. The terminology used in the description herein is merely to effectively describe particular embodiments and is not intended to limit the invention.

Throughout this specification, unless the context otherwise requires, the words "comprise" and "comprising" include a given step or component, or group of steps or components, but any other step or component, or It should be understood that this implies that no step or group of components is excluded.

Additionally, as used in the specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to also include the plural forms, unless the context clearly dictates otherwise.

In the present invention, the term 'grouting composition' is a type of ground injection agent, which is injected and filled into pores within underground structures or the ground, or cavities existing at the interface between underground structures and the ground, to quickly fill the pores and cavities, and to prevent moisture infiltration. It refers to a composition that can prevent corrosion, increase structural stability and bearing capacity of the ground, or restore the cross section.

The grouting composition according to the present invention may include cement, fluidizing agent, plastic compound, and thickener.

In the present invention, the cement is a basic material for forming a grout composition, and is not limited to the type of cement commonly used in the grout composition in the art. Examples of these cements include Portland cement, early strength cement, super early strength cement, MDF cement, DSP cement, densheet type cement, filament type cement, calcium aluminate cement, plaster, silicate cement, gypsum cement, phosphate cement, and high alumina cement. , ultrafine cement, slag cement, magnesium oxychloride cement, ultra-fast hardening cement, alumina cement, and microcement, etc. These may be used alone or in a mixture of two or more.

More preferably, the cement is microcement. Because the microcement has a small particle size, it has excellent miscibility compared to other cements, and because of this, the desired level of strength can be obtained in a short time due to high fast hardening after construction.

For this purpose, the cement preferably has a brain fineness of 3,000 to 9,000 c㎡/g. At this time, the measurement method for the brain fineness is not limited, but it is recommended to measure it in accordance with KS K 5106 (Method for testing Portland cement fineness using an air permeation device).

If the powder fineness of the cement is less than the above range, the effect of increasing rapid hardening described above is minimal, and if it exceeds the above range, the agglomeration phenomenon between cements is maximized, which may actually reduce miscibility and rapid hardening.

Additionally, the cement may be added in the form of a cement composition in which a portion of the cement is replaced with blast furnace slag. The blast furnace slag is a by-product generated in a blast furnace when producing pig iron at a steel mill, and when mixed with cement, it has high long-term strength, low heat of hydration, and excellent chemical resistance and watertightness.

When the blast furnace slag is replaced with part of the cement, the replacement ratio is not limited, but it is preferable that the cement and blast furnace slag are mixed at a weight ratio of 8 to 9: 1 to 2.

In the present invention, the fluidizing agent is used to further increase miscibility between cement and other components to increase rapid hardening. In particular, it can increase miscibility by achieving steric and electrostatic stabilization of cement particles and the plastic compound to be described later.

Specifically, the fluidizing agent is a monomer or oligomer having one or more functional groups, which can partially surround the above-mentioned particles and prevent them from agglomerating or clumping.

Because the fluidizing agent has a head group and a tail group similar to a surfactant, it forms a double layer when surrounding particles. In particular, it can reduce the amount of water used because it adsorbs to the surface of cement particles and effectively disperses the cement particles. Reducing the amount of water used increases the density of cement and plastic compounds per unit volume, ultimately improving resistance to compressive force, thereby improving mechanical properties such as compressive strength after construction.

The fluidizing agent includes a monomer or oligomer that has anionic properties in an aqueous solution. Examples of such dispersants include formaldehyde-based, naphthalene-based, melamine-based, lignin-based, and polycarboxylate-based dispersants. Among these, lignin-based, melamine-based, and polycarboxylic acid-based fluidizers are preferred, and most preferably, polycarboxylate-based It is advisable to include a base acid-based fluidizing agent.

The lignin-based fluidizer is composed mainly of lignin sulfonic acid or its salt, the melamine-based fluidizing agent is composed mainly of melamine sulfonic acid formalin condensate or its salt, and the polycarboxylic acid-based fluidizing agent is composed of polycarboxylic acid or its salt.

Among these, the polycarboxylic acid or its salt may be any known polycarboxylic acid or its salt, examples of which include acrylic acid, methacrylic acid, crotonic acid, maleic anhydride, maleic acid, and maleic acid monoester. , polycarboxylic acid obtained from a copolymer of a monomer selected from tetrahydrophthalic anhydride or tetrahydrophthalic acid and a monomer copolymerizable therewith. For example, methacrylic acid hydroxypropyl methacrylate copolymer, acrylic acid-hydroxyethyl acrylate copolymer, methacrylic acid methyl methacrylic acid polyethylene glycol copolymer, styrene maleic acid methylpolyethylene glycol copolymer, styrene maleic acid. (maleic acid) butyl copolymer, methylpolyethylene glycol allyl ether-maleic acid copolymer, vinyl acetate-maleic acid copolymer, methyl vinyl ether-maleic acid copolymer or salt thereof can be mentioned.

However, the polycarboxylic acid or its salt that can be used in the present invention is not limited to the compounds shown here, and the production method thereof is not limited, for example, the type of polymerization initiator or polymerization method.

In addition, in terms of preventing corrosion and salt damage, the fluidizing agent has a solid content of 45% by weight or more, a SO ₄ ^2- content of 15% by weight or less, a ^CI- content of 0.5ppm or less, a pH of 7.5 to 11, and a specific gravity of 1.1 to 1.3 g/ml. It is desirable to be If the specifications of the fluidizing agent are outside the above range, the fluidizing agent may actually act as a cause of corrosion and reduce the mechanical properties of the constructed part.

The fluidizing agent is preferably included in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of cement. If the content of the fluidizing agent is less than the above range, the effect of improving the dispersibility of the particles described above is minimal, and if it exceeds the above range, the quick setting after construction may decrease and the desired strength may not be properly achieved.

Additionally, the fluidizing agent may further include nonionic compounds in addition to the anionic compounds described above.

In general, a fluidizing agent adsorbs to cement or other filler particles to maintain the dispersibility of these particles and improve fluidity. Additionally, because they surround the surface, they sometimes have the effect of delaying the rapid hardening of the composition. In particular, since the sustainability of cement particle dispersion in anionic fluidizers is very dependent on time and temperature, the dispersibility decreases immediately after use. If the anionic fluidizing agent is not used immediately after manufacturing the composition, the decrease in dispersibility causes not only phase separation of the composition but also hardening. Afterwards, a decrease in mechanical properties may occur.

In order to solve these shortcomings, the present invention can further add a nonionic fluidizing agent along with the anionic fluidizing agent. The nonionic fluidizing agent can maintain the dispersibility of cement and other particles for a long time even after manufacturing the composition, and not only uses less water than other fluidizing agents, but also has the effect of improving workability by maintaining fluidity. have

These nonionic fluidizers have an anchor that chemically bonds to the surface of particles such as cement or clinker, and a dispersant (tail) creates steric hindrance to stabilize them. In particular, the main chain binds to the cement particles, and the hydrophilic group has a strong tendency to dissolve into an aqueous solution on the surface, making the surface hydrophilic. When mixed with the anionic fluidizing agent described above, the anionic fluidizing agent exerts a repulsive force between other particles. It disperses the particles and prevents them from coagulating with each other.

The nonionic fluidizing agent can be used without limitation as long as it exhibits the above-mentioned properties. Such fluidizing agents include, for example, ethoxylated linear alcohol, ethoxylated amine, alkyl polyglycolside, polyoxyethylene glycol ether, polyoxyethylene polyoxypropylene glycol ether, polyoxyethylene alkyl phenyl ether, and polyoxyethylene alkyl. It is preferable to select and use at least one from the group consisting of ether, naphthyl polyoxyethylene ether, polyoxyethylene lanolin alcohol ether, and fatty acid ester, more preferably polyoxyethylene glycol ether, polyoxyethylene polyoxypropylene. It is any one or two or more selected from the group consisting of glycol ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl ether, naphthyl polyoxyethylene ether, and polyoxyethylene lanolin alcohol ether.

The amount of the nonionic fluidizing agent added is not limited in the present invention, but is preferably included in an amount of 0.1 to 3 parts by weight based on 100 parts by weight of cement. If the amount of the fluidizing agent added is less than the above range, the above-mentioned fluidity improvement effect is insufficient, and if it exceeds the above range, the particles surrounded by the nonionic fluidization agent may act as cracks in the composition and the mechanical properties may decrease.

The plastic compound generates metal hydrates in the composition, and these hydrates exhibit expansion, rapid setting, and high strength, which can increase the mechanical properties of the composition.

These plastic compounds are added in the form of clinker. At this time, the clinker refers to the lump remaining after firing, and is a porous lump that becomes the raw material for cement, and is also called a lump in the sense of a burnt lump.

Specifically, the clinker may include lime, gypsum, and bauxite. The lime reacts with the rapid setting indexing agent described later to generate ettringite (3CaO·Al ₂ O ₃ ·3CaSO ₄ ·32H ₂ O), compensates for shrinkage, and plays a role in developing initial strength after gelation of the grout. Do it.

It is recommended to add 10 to 50 parts by weight of lime per 100 parts by weight of cement. If the amount of lime added is less than the above range, the effect of developing the initial strength described above is insufficient, and if it exceeds the above range, the constructability and processability of the composition decrease, brittleness increases, and cracks may easily occur.

The gypsum is intended to increase initial strength by helping the creation of metal hydrates and densifying the tissue, and may include gypsum commonly used in the art. Examples of such gypsum include one or a mixture of two or more selected from the group consisting of phosphoric acid byproduct gypsum, flue gas desulfurization dihydrate gypsum, natural dihydrate gypsum, hemihydrate gypsum, natural anhydrous gypsum, hydrofluoric acid anhydrous gypsum, and phosphoric acid anhydrous gypsum. Preferably, anhydrous gypsum is used. It is good to include plaster.

The anhydrous gypsum (anhydrite) is a major crude rock mineral composed of anhydrous calcium sulfate (CaSO ₄ ) and does not have crystallization water, so it is gypsum (a mineral changed to a water-containing state). It is chemically distinct from It is most commonly found in salt deposits involving gypsum, such as the cap rock of the Texas-Louisiana salt dome.

The anhydrite above forms aggregates showing orthogonal cleavage, fibrous aggregates, or curved tripestones. Like gypsum jade, a variety produced in Vulfino, Lombardy, Italy, it may form fine-grained or scaly aggregates. It is one of the most important minerals in evaporite deposits, and also exists in dolomite and limestone, and as a gangue mineral in mineral veins. Anhydrous gypsum is used in plaster and cement, and gypsum is cut and polished and used as ornaments. Anhydrite crystals belong to the orthorhombic system.

The gypsum is preferably contained in an amount of 10 to 30 parts by weight based on 100 parts by weight of cement. If the gypsum content is less than the above range, the effect of developing the initial strength described above is insufficient, and if it exceeds the above range, the workability may decrease and brittleness may increase due to rapid hydration reaction of the composition, which may easily cause cracks.

The bauxite is a raw material for early strength cement, which is generally manufactured by mixing cement with kaolin, fluorspar, etc., and has a light gray or grayish brown color, and is added to increase the rapid hardening of the composition. In particular, the bauxite has excellent strength, wear resistance, and fire resistance, which has the effect of increasing the strength, wear resistance, and fire resistance of the composition.

The bauxite preferably contains 10 to 50 parts by weight based on 100 parts by weight of the above-mentioned cement. If the amount of bauxite added is less than the above range, the effect of improving physical properties such as fast hardening, strength, and wear resistance described above is minimal, and if it exceeds the above range, the workability decreases due to excessive hydration reaction of the composition and brittleness increases, making cracking easy. It can happen.

The manufacturing method of the above plastic compound is not limited. For example, the calcination compound is prepared by mixing lime, gypsum, and bauxite and then calcination them at a temperature of 500 to 2,000°C for 1 to 50 hours to produce a calcination compound containing Calcium Sulfo Aluminate. You can. The produced plastic compound can be pulverized to have an appropriate particle size distribution.

During the hydration reaction, the calcined compound produces needle-shaped crystals called ettringite described above. At this time, the ettringite can significantly exhibit expansion, rapid setting, and high strength depending on the composition ratio of lime, gypsum, and bauxite.

In the present invention, the thickener has the effect of improving the toughness, plasticity, stress resistance, and impact resistance of the composition. In particular, the thickener can control the rapid hydration reaction caused by the addition of the rapid setting inhibitor, which will be described later, and correct the delay in strength development.

Examples of such thickeners include hydroxy ethyl cellulose thickener, hydroxy methyl cellulose thickener, hydroxy propyl cellulose thickener, carboxy meme cellulose thickener, methyl cellulose thickener and ethylene vinyl acetate polymer, etc., which can be used alone or in a mixture of two or more. You can use it.

The thickener is preferably ethylene vinyl acetate. The physical properties of ethylene vinyl acetate are determined by the degree of polymerization and the content of vinyl acetate, but basically, as the molecular weight increases, the physical properties such as toughness and impact resistance are improved, and as the vinyl acetate content increases, density, rubber elasticity, flexibility, etc. Usability with other polymers or plasticizers improves, but mechanical properties may decrease, so it is better for the content of vinyl acetate to be 10 to 20% by weight out of 100% by weight of the polymer.

The thickener preferably contains 0.1 to 0.5 parts by weight based on 100 parts by weight of the cement. If the amount of the thickener added is less than the above range, the effects of controlling the hydration reaction rate and compensating for the delay in strength development are insufficient, and if it exceeds the above range, the constructability and mechanical properties may decrease due to a decrease in the rapid hardening of the composition.

In the grout composition according to the present invention, in addition to the cement, the powder of the remaining components should also satisfy the same range as the cement. In particular, the thickener should be added in the form of a powdered thickener rather than an aqueous solution. Specifically, it is recommended that the brain fineness measured by KS K 5106 satisfies 3,000 to 9,000 c㎡/g.

The present invention may include a method for producing a composition for grouting construction containing the grout composition described above. Specifically, the manufacturing method includes a) preparing a first composition by mixing 10 to 150 parts by weight of the grout composition with 100 parts by weight of water; b) preparing a second composition containing an aqueous silica solution, a rapid setting agent, or a mixture thereof; and c) mixing the first composition and the second composition.

At this time, the composition for grouting construction may have a different composition ratio of the grout composition, water, and other compositions depending on the intended use.

For example, in the case of a water-water grouting method to prevent groundwater outflow during ground excavation, the first composition is prepared by mixing 100 to 130 parts by weight of a grout composition with 100 parts by weight of water, and 100 to 130 parts by weight of a silicate compound is mixed with 100 parts by weight of water. After preparing the second composition by mixing 130 parts by weight, the composition for the grouting method can be prepared by mixing it at a 1:1 volume ratio. At this time, the composition prepared as above has a gelation time of 5 to 25 seconds, a curing time of 24 ± 1 hour, and a compressive strength of 3 MPa or more.

In addition, the composition used in the above method can be adjusted to the composition ratio of the first composition to control the gelation time. Specifically, when preparing the first composition, if 50 to 70 parts by weight of grout composition is mixed with 100 parts by weight of water and the amount of grout composition added is reduced, the gelation time increases to 60 to 240 seconds. This reduces the rapid hardening of the composition to some extent, suppressing the deterioration of constructability due to hardening and allowing smooth construction.

In addition, the method of producing a composition for grouting construction, which is applied to a caulking agent in a reinforcement method for ground reinforcement when excavating a tunnel, using the above composition is to prepare the first composition by mixing 100 to 150 parts by weight of the grout composition with respect to 100 parts by weight of water, After preparing the second composition containing the rapid setting stop agent, it can be prepared by mixing the first composition and the second composition. At this time, the amount of the rapid setting stop agent added is not limited in the present invention, but may be 100 to 150 parts by weight based on 100 parts by weight of water included in the first composition.

In addition, the composition for grouting construction, which is applied as a sealing agent for ground reinforcement when excavating a tunnel, is prepared by mixing 5 to 20 parts by weight of bentonite with respect to 100 parts by weight of water and mixing 15 to 40 parts by weight of the grout composition. After preparing the first composition, a second composition is prepared by mixing 20 to 400 parts by weight of a silicate compound with 100 parts by weight of water, and the first composition and the second composition are mixed in a 1:1 volume ratio for grouting construction. A composition can be prepared. At this time, the composition prepared as above can secure a curing time of 2 to 8 hours ± 1 hour to reach a penetration of 10 mm in the Vicat needle test.

In addition, the composition for grouting construction, which is applied to the grouting injection agent for ground reinforcement during tunnel excavation, is prepared by mixing 60 to 100 parts by weight with respect to 100 parts by weight of water to prepare the first composition, and 100 parts by weight of water. After preparing the second composition by mixing 100 to 130 parts by weight of the silicate compound, the composition for grouting construction can be prepared by mixing the first composition and the second composition in a 1:1 volume ratio. At this time, the composition has a gelation time of 5 to 240 seconds, a curing time of 4 to 8 ± 1 hour, and a compressive strength of 2 MPa or more.

Additionally, the present invention may include a grouting injection agent for water blocking and reinforcing grouting for embankments such as dams, reservoirs, and rivers. At this time, the injection agent can be prepared by mixing 50 to 500 parts by weight of the grout composition with respect to 100 parts by weight of water, and the composition prepared as above has an expansion rate of -0.5 to -5% by volume after mixing, a specific gravity of 1.05 to 1.84, and an age of After 28 days, the compressive strength can satisfy 14.5 to 29.0 N/㎟.

The grouting injection agent as described above can change the mixing ratio of the composition step by step from empty mix to submix, and from submix to empty mix, depending on the injection pressure of the ground and the injection amount of the grouting composition. At this time, the empty mix is a mix in which the unit cement amount in the composition is in the range of 150 to 250 kg/m3, and the submix is a mix in which the unit cement amount is in the range of 300 kg/m3 or more.

This mixing design is intended to optimize the condition and mechanical properties of the composition after the process is completed. In particular, the poorer the composition, the more heat of hydration is generated during curing, which can easily cause cracks. The poorer the mixing, the lower the viscosity and the lower the mechanical properties. Since strength may decrease, it is desirable to set the optimal mix.

In the present invention, the silicate compound is used to increase impact resistance and wear resistance when curing the grouting composition, and is not limited to the type as long as it is a silicate compound commonly used in the industry, for example, sodium silicate, potassium silicate, and sodium silicate. Sodium, etc. can be mentioned. These silicate compounds may be one or more.

If the amount of the silicate compound added to the composition for grouting is less than the above range, cracks may occur in the composition after construction, and if it exceeds the above range, the grouting penetration power of the composition may be weakened.

In the present invention, the rapid setting indexing agent is used to significantly improve the initial workability of the grouting composition and to achieve a low air entrainment effect and a high strength grouting composition after curing, and is composed of acrylic acid monomer, polyethylene glycol-monomethyl ether -It may include a (meth)acrylate monomer and a polymer of a monomer having a propyloxy group.

Examples of the acrylic acid monomer include acrylic acid or methacrylic acid and its salts, and the polyethylene glycol-monomethyl ether-(meth)acrylate monomer is polyethylene glycol-monomethyl ether-(meth)acrylate having a molecular weight of 200 to 2,000. and rate monomers. Examples of monomers having the propyloxy group include polypropylene glycol dimethacrylate.

The polymerization ratio of the acrylic acid monomer, polyethylene glycol-monomethyl ether-(meth)acrylate monomer, and monomer having a propyloxy group is not limited. For example, the rapid setting index agent can be prepared by polymerizing 90 to 99.9% by weight of a mixture of acrylic acid monomer and polyethylene glycol-monomethyl ether-(meth)acrylate monomer and 0.1 to 10% by weight of monomer having a propyloxy group.

If the amount of the rapid setting agent added to the composition for grouting is less than the above range, the effect of rapid setting and enhancing mechanical properties described above is insufficient, and if it exceeds the above range, the rapid hardening of the composition deteriorates workability and increases brittleness, resulting in cracks. It can happen.

In the present invention, the bentonite is added to improve the water tightness and permeability coefficient of the composition. If the amount added is less than the above range, the above-mentioned effect is minimal, and if it exceeds the above range, the constructability and mechanical properties may decrease due to increased viscosity. You can.

In addition, the composition for grouting may further include a porous copolymer and a silicone compound to improve the decrease in specific gravity due to increased miscibility of the composition and to improve mechanical properties.

The porous copolymer forms a large number of pores within the fine particles, and contains the above-described silicone compound in the pores. The silicone compound is slowly and uniformly re-released at room temperature to remove air bubbles in the composition, and the porous copolymer is By absorbing water in the composition while releasing the silicone compound, moisture in the composition can be reduced and mechanical properties can be further improved.

The material of the porous copolymer is not limited in the present invention, and for example, it may be a condensation product of urea, melamine, or a mixture thereof and an alkanal, and more specifically, it may be a copolymer of urea and formaldehyde.

The copolymer may have a granular form with a bulk density of 50 to 80 kg/m3. Additionally, the particle size may be 10 nm or more, more preferably 50 to 100 nm in diameter.

The silicone compound is liquid at 0°C, and may specifically be organopolysiloxane. The organopolysiloxane may be branched or straight-chain, and may include polymer-based, oligomeric-based, and dimer-type siloxane. In addition, the silicone compound preferably has a viscosity of 10 mPa·s or more, more preferably 100 to 5,000 mPa·s, when measured at 25°C.

The amount of the porous copolymer containing the silicone compound is not limited, but is preferably included in an amount of 1 to 10 parts by weight based on 100 parts by weight of water in the first composition. If the amount of porous copolymer added is less than the above range, the effect of increasing the mechanical properties described above is minimal, and if it exceeds the above range, the mechanical properties may also significantly decrease due to the increase in the silicon compound in the grouting composition.

The present invention may include a grouting construction method using a composition for grouting construction manufactured by the above production method. The above construction method can improve construction stability by enabling real-time response to heterogeneous ground through adjustment of the composition ratio by constructing using the above-described composition, and can increase penetration by applying various base cements to the composite stratum. there is. In addition, constructability can be improved by adjusting the gel time according to site conditions, and the stability of heterogeneous strata can be improved by increasing initial strength. Here, by adjusting the composition ratio according to the construction method, the curing time can be shortened and the backflow of the grouting injection material can be prevented, thereby shortening the working period and improving quality.

Hereinafter, the present invention will be described in more detail through examples and comparative examples. However, the following examples are only one example to explain a preferred embodiment of the present invention, and the present invention is not limited by the following examples.

(Production Examples 1 to 4)

First, Portland cement and blast furnace slag were mixed at a weight ratio of 8.5:1.5, and 100 parts by weight of the above mixed cement composition and 2 parts by weight of a fluidizing agent (methacrylic acid hydroxypropyl copolymer) were prepared. Separately, 30 parts by weight of lime was prepared. A fired compound was prepared by calcining and pulverizing a mixture of 20 parts by weight of gypsum, 20 parts by weight of bauxite, and 0.5 parts by weight of a thickener (ethylene vinyl acetate) was mixed and pulverized.

At this time, the powder degree of the composition was adjusted. Specifically, the brain fineness was 4,000 c㎡/g (Preparation Example 1), 8,000 c㎡/g (Preparation Example 2), and 2,800 c㎡/g (Preparation Example 3), and the cement composition was made of only Portland cement. was set to 2,800 c㎡/g (Preparation Example 4).

(Examples 1 to 4)

A composition for grouting construction was prepared using the grout composition prepared through Preparation Examples 1 to 4 above. Specifically, after preparing a first composition by mixing each of the compositions of Preparation Examples 1 to 4 with water at a weight ratio of 1:1 and a second composition by mixing sodium silicate and water at a weight ratio of 4:6, the first composition and the second composition were mixed together. 2 Compositions were mixed at a volume ratio of 1:1 to prepare a composition for grouting construction.

The gel time and gel compressive strength of the grouting composition prepared as above were measured and listed in Table 1. Compressive strength was measured at regular intervals after curing.

division Example 1 Example 2 Example 3 Example 4 composition Manufacturing Example 1 Production example 2 Production example 3 Production example 4 Gel time (seconds) 15.7 13.8 29.1 27.8 Gel compressive strength
(㎫) 1 hours - - - - 2 hours 0.3 0.5 - - 3 hours 0.4 0.6 0.2 0.3 4 hours 0.9 1.8 0.4 0.7 5 hours 1.2 2.0 0.7 1.0 6 hours 1.6 2.2 0.9 1.1 7 hours 2.0 2.7 1.1 1.4 8 hours 2.6 3.0 1.3 1.7 12 hours 3.1 3.4 1.4 2.0 24 hours 3.3 3.7 1.8 2.1

As shown in Table 1 above, it can be seen that the gel time and compressive strength are improved as the fineness of the grout composition is adjusted. Specifically, in Example 1, the gel time was 15.7 seconds, the compressive strength of the homogel was 2.0 MPa after 7 hours of curing, and 3.3 MPa after 24 hours of curing, and in Example 2, the gel time was 13.8 seconds and 7 hours of curing. The compressive strength after curing was 2.7 MPa and 3.7 MPa after 24 hours of curing.

On the other hand, the gel time of Examples 3 and 4 exceeded 25 seconds, and the compressive strength of Example 3 did not exceed 2.0 MPa even after 24 hours of curing, and Example 4 barely secured a compressive strength of 2.0 MPa or more. , it can be seen that it is much insufficient compared to Examples 1 and 2.

(Examples 5 to 8)

The grout composition prepared in Preparation Examples 1 to 4 was mixed with water and a rapid setting stop agent (CX-1, mapei) at a weight ratio of 1:1:1, and then the compressive strength was measured and listed in Table 2.

division Example 5 Example 6 Example 7 Example 8 composition Manufacturing Example 1 Production example 2 Production example 3 Production example 4 compressive strength
(㎫) 30 minutes 1.3 1.6 0.6 0.7 1 hours 2.8 3.1 0.9 1.8 2 hours 4.8 5.7 2.4 2.9 3 hours 5.3 6.2 2.7 3.5 4 hours 5.9 6.6 3.8 4.1 5 hours 6.1 6.8 4.2 4.5

As shown in Table 2, the composition for grouting construction prepared in Preparation Examples 1 and 2 had a compressive strength of 4.0 MPa or more after 2 hours of curing. On the other hand, the compositions prepared in Preparation Examples 3 and 4 recorded a compressive strength of 4.0 MPa or more only after 5 hours (Example 7) and 4 hours (Example 8) of curing, respectively, compared to Examples 5 and 6. It can be seen that it shows a much lower compressive strength.

(Examples 9 to 11)

The grout composition prepared in Preparation Example 1 was mixed with a first composition in which water and bentonite were stirred at a weight ratio of 1:0.1:0.24, respectively, and a second composition in which sodium silicate and water were stirred at a volume ratio of 4:1 in a 1:1 volume ratio. A composition for grouting construction was prepared by mixing (Example 9).

In addition, the grout composition prepared in Preparation Example 2 was mixed with a first composition in which water and bentonite were stirred in a weight ratio of 1:0.1:0.24, respectively, and a second composition in which sodium silicate and water were stirred in a volume ratio of 4:1 in a 1:1 volume ratio. A composition for grouting construction was prepared by mixing (Example 10).

Finally, Example 11 was prepared by stirring the grout composition prepared in Preparation Example 3 with water and bentonite at a weight ratio of 1:0.22:0.069, respectively.

The compositions of Examples 9 to 11 prepared were subjected to a Vicat needle penetration test to measure the degree of penetration according to the curing time. Separately, the presence or absence of material separation was visually confirmed and listed in Table 3.

division Example 9 Example 10 Example 11 composition Manufacturing Example 1 Production example 2 Production example 3 Amount of needle penetration
(㎜) 1.5 hours 19 17 Not measurable 2 hours 17 14 Not measurable 2.5 hours 14 12 Not measurable 3 hours 11 9 Not measurable 3.5 hours 9 8 Not measurable 4 hours 8 8 Not measurable 4.5 hours 8 7 Not measurable 5 hours 7 6 Not measurable 12 hours 2 One Not measurable material separation
Whether 1 hours No material separation No material separation Material separation occurs 4 hours No material separation No material separation Material separation occurs 8 hours No material separation No material separation Material separation occurs

As shown in Table 3 above, it can be seen that in the case of Examples 9 and 10, the penetration of Vicat needles was less than 10 mm after 3 to 4 hours of curing. On the other hand, in the case of Example 11, material separation occurred, and it can be seen that curing was not done properly to the extent that needle penetration test was impossible.

(Examples 12 to 15)

A composition for grouting construction was prepared using the composition prepared in Preparation Example 2. Specifically, in the grout composition of Preparation Example 2, 2 parts by weight of polyoxyethylene glycol ether was added as a nonionic fluidizing agent.

Next, the first composition mixed with water at a 1:1 weight ratio and the second composition mixed with sodium silicate and water at a 4:6 weight ratio were prepared, and then the first composition and the second composition were mixed at a 1:1 volume ratio. A composition for grouting was prepared (Example 12), and in Example 12, 5 parts by weight of porous copolymer (urea-formaldehyde copolymer) was added to 100 parts by weight of water in the first composition (Example 13). , The same addition amount of porous copolymer (urea-formaldehyde copolymer, Example 14) as Example 13 carrying organopolysiloxane (viscosity 1,000 mPa·s) in Example 12, Addition amount of porous copolymer in Example 14 A composition (Example 15) adjusted to 15 parts by weight was prepared.

The gel time and gel compressive strength of the grouting composition prepared as above were measured and listed in Table 4. Compressive strength was measured at regular intervals after curing.

division Example 12 Example 13 Example 14 Example 15 Gel time (seconds) 14.3 13.5 10.9 11.6 Gel compressive strength
(㎫) 1 hours - - - - 2 hours 0.4 0.6 0.8 0.6 3 hours 0.7 0.9 1.3 0.9 4 hours 0.9 1.3 1.7 1.4 5 hours 1.4 1.7 2.1 1.7 6 hours 1.6 2.3 2.5 2.5 7 hours 2.2 2.6 3.2 2.6 8 hours 2.8 3.0 3.8 2.9 12 hours 3.4 3.1 4.3 3.0 24 hours 3.7 3.2 4.7 3.1

As shown in Table 4, Example 12, in which a nonionic fluidizing agent was further added, had a slightly increased gel compressive strength compared to Example 1, and Examples 13 and 14, in which porous copolymer particles and organopolysiloxane were supported on the porous copolymer particles, were obtained. It can be seen that it shows the best gel compressive strength. However, as in Example 15, when the amount of porous copolymer particles carrying organopolysiloxane is added above a certain level, the amount of organopolysiloxane released from the composition increases excessively, thereby hindering curing, thereby deteriorating the mechanical properties.

Meanwhile, in the detailed description of the present invention, the preferred embodiments have been described in detail, but of course, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the patent claims described later, but also by the scope of the claims and their equivalents.

Claims (9)

A grout composition with improved water resistance, reinforcement, and seismic performance. The composition includes 100 parts by weight of cement, 0.1 to 5 parts by weight of a fluidizing agent, 1 to 50 parts by weight of a plastic compound, and 0.1 to 0.5 parts by weight of a thickener,
The composition replaces a portion of the cement with blast furnace slag, and the replacement ratio of the blast furnace slag includes mixing the cement and the blast furnace slag at a weight ratio of 8 to 9: 1 to 2,
The composition has a brain fineness of 8,000 c㎡/g,
The fluidizing agent contains 0.1 to 5 parts by weight based on 100 parts by weight of cement, is one or more selected from formaldehyde-based, naphthalene-based, melamine-based, lignin-based, and polycarboxylate-based, and has a solid content of 45% by weight or more, SO ₄ ^2- content is 15% by weight or less, CI-content is 0.5ppm or less, pH is 7.5 to 11, and specific gravity is 1.1 to 1.3 g/ml,
The fluidizing agent further includes 0.1 to 3 parts by weight of a nonionic fluidizing agent based on 100 parts by weight of the cement, and the nonionic fluidizing agent includes polyoxyethylene glycol ether, polyoxyethylene polyoxypropylene glycol ether, and polyoxyethylene alkyl. A grout composition with improved water resistance, reinforcement, and seismic performance, characterized in that it is one or more selected from the group consisting of phenyl ether, polyoxyethylene alkyl ether, naphthyl polyoxyethylene ether, and polyoxyethylene lanolin alcohol ether.
According to clause 1,
A grout composition with improved water resistance, reinforcement, and seismic performance, characterized in that the plastic compound is ground clinker containing 10 to 50 parts by weight of lime, 10 to 30 parts by weight of gypsum, and 10 to 50 parts by weight of bauxite, based on 100 parts by weight of cement. .
delete delete A method for manufacturing a composition for grouting construction using the grout composition according to any one of claims 1 to 2, the manufacturing method comprising:
a) preparing a first composition by mixing 10 to 150 parts by weight of the grout composition with 100 parts by weight of water;
b) preparing a second composition containing an aqueous silica solution, a rapid setting agent, or a mixture thereof; and
c) mixing the first composition and the second composition;
A method for producing a composition for grouting construction, comprising:
According to clause 5,
A method for producing a composition for grouting, characterized in that the aqueous silica solution contains 10 to 500 parts by weight of a silicate compound based on 100 parts by weight of water.
According to clause 5,
The rapid setting index agent is a method of producing a composition for grouting construction, characterized in that it includes a polymer of acrylic acid monomer, polyethylene glycol-monomethyl ether-(meth)acrylate monomer, and a monomer having a propyloxy group.
According to clause 5,
The first composition is a method of producing a composition for grouting construction, characterized in that it further contains 5 to 20 parts by weight of bentonite.
A grouting construction method using a composition for grouting construction manufactured by the production method according to claim 5.