KR101473228B1 - The composition of solidificant having highstrength and rapid solidification - Google Patents

Abstract

The invention high strength grade integrity and expandable hydration structure in Fortran root cement as agent composition: the strength of Portland cement to the soil containing humic acid by introducing a clinker powder _{(Hauyne 3CaO · 3Al 2 O 3} · CaSO 4) It is possible to remarkably reduce the material cost by using a large amount of blast furnace slag and fly ash, and to increase the strength and permeability of the blast furnace slag late in the performance, It is possible to obtain the effect of improving the strength and the workability and to increase the composition ratio width of the gypsum and lime to control the composition ratio to be suitable for the soil condition and to further improve the fluidity by the tartaric acid, , Impact resistance by EVA resin, prevention of deterioration of solidifying agent, waterproof property, cold resistance, emulsion stability by alginate, Durable high strength level to ensure such isomeric integrity and relates to the topic.

Description

[0001] The present invention relates to a composition for solidifying a high strength,

The present invention specifically, the inflatable hydration structure as a high-strength hydration structure relates to a high-strength grade integrity solidifying agent composition: Et Lin Xi by the addition of clinker powder _{(Hauyne 3CaO · 3Al 2 O 3} · CaSO 4) in Fortran root cement The addition of blast furnace slag and fly ash which minimizes cracking due to expansion and drying shrinkage and minimizes the strength enhancement and has potential hydraulicity and promotes the strengthening of aggregate can greatly reduce the amount of cement due to resource recycling, (Synthomer 29Y40) is added to the antifouling composition of the cement ceramic to form an antioxidant film. It is expected that durability and adhesiveness can be expected due to the chemical safety between the materials. Tataric acid is a high- And applying EVA (Ethylene-Vinyl Acetate) to improve waterproof and impact resistance Is written can greatly improve the water resistance and the impact resistance in all conditions and cold conditions of underground high-strength high-grade ceramic integrity it relates to a topical composition.

Especially, the anchor is able to provide high tensile strength to the steel by connecting it with the high strength steel between the ground and the ground and the stable permeability and the settlement ground at any depth and condition of the ground. A ceramic solidifying agent is required.

The high-strength quick-setting ceramic toughening agent of the present invention uses blast-furnace slag and fly ash, which have potential hydraulicity and ability to enhance the aggregate function, instead of drastically reducing the amount of cement, and also improve the wettability between CSA swelling agent and cement Gypsum and lime are added to the product according to the conditions of the site to improve the hydration heat characteristics according to the hydration reaction. Thus, it is possible to freely obtain the working time of the work requirement and to cure the solidification due to the hydration heat even in a low temperature environment And has a characteristic of promoting time. In addition, by adding tartaric acid and EVA resin as a high performance fluidizing agent, it is possible to secure excellent flowability, permeability, water resistance and impact resistance in any state of the underground. By using alginate salt, different properties can be obtained by dispersibility, It is possible to improve the physical properties by homogenizing the solidifying agent composed of the materials having the excellent hardenability and the excellent workability.

A variety of solidifying agents (soil improvement agents) have been used for the purpose of improving the volume stability strength and capacity deformation properties of soil, permeability coefficient and durability. Solidification agents used in soft grounds range from inorganic materials to organic materials, but cement and lime are representative in terms of performance and economy.

As described above, the ground improvement using the conventional solidifying agent based on cement and lime is carried out through the solidification of the soil particles and the filling of the gaps in the hydration reaction process. However, in the case of clay, it is difficult to mix soil and solidifying agent, and when the organic matter is contained in the soil in a large amount, the effect of improving with the solidifying agent is greatly reduced. This is because the organic humic acid reacts with the calcium hydroxide generated in the hydration reaction of the cement to generate caustic calcium to deplete the calcium ions necessary for cement hydration and to hydrophilize the surface of the cement particles which are not hydrated, do.

In addition, the improvement of the ground for sandy soil or silty soil using a conventional lime and pozzolanic material as a solidifying agent is similar to that of cement, but it is difficult to expect a large strength development and a considerable time is required until the treatment effect is manifested. And freezing and thawing.

In addition, conventional solidifying agents such as soft ground have been used as solidifying agents to impart a fluidity, permeability, waterproofing and order function to a large amount of cement as grouting material. In recent years, CSA swelling agent, water reducing agent, High strength cements have been introduced with solidifying agents to which one or more physical properties improver has been added. They are used physically to improve the physical properties of the soil, and chemically include hydration, ion exchange, pozzolanic, coagulation, precipitation, Although it is used for slope stabilization, soft ground reinforcement, and filled grout anchor construction method in civil engineering construction field using carbonation reaction, it is said to be a solidifying agent or admixture having much room for improvement in physical properties such as strength at the side, tensile strength, .
Although the conventional solidifying materials and solidifying agents and their problems have been described in the above, a more detailed description of the conventional arts is as follows. Korean Patent Registration No. 10-1212196 discloses "a solidifying agent for dredged soil and a soil improving agent "And the content of the technique is to add 5 ~ 30wt% of alumina powder to 70 ~ 95wt% of inorganic solidifying agent composed of cement, quicklime and gypsum, or add 1 ~ 50wt% of mixed soil of sandy soil and high quality soil As described above, it is a solidifying agent composed mainly of cement, quicklime and gypsum which are extremely general solidifying materials as mentioned above, and can not be said as a solidifying agent which can be expected to have excellent strength and durability, and can be obtained by a conventional hydration reaction It can be said to be a solidifying agent that has strength level by hydroponics and physical property without specificity.
As another prior art, Korean Patent Registration No. 10-941047 discloses a technical content of "a solidifying agent and a non-calcined loess brick using the same and a manufacturing method thereof ", wherein the technical content includes loess ash, cement, sand , Graphite, and dolomite, and then solidified by molding into a kneaded product obtained by adding an organic and inorganic solidifying agent aqueous solution to the dry mixture. The solidification mechanism of the bricks is the solidification mechanism which is hydrated by the hydration reaction with water when adding the solidifying agent aqueous solution to the alumina ash and cement contained in the loess and the solidification mechanism by the hardening by the organic solidification solidifying agent. A solidification method of imparting strength by a solidification mechanism achieved by three different mechanisms of the solidification mechanism by self-solidification of the topic, blast furnace slag and fly ash of the present invention of the present invention, And CSA clinkers are different from each other in terms of technical structure.

As a high strength hydration reaction structure, Crinka powder of the Augin structure (Hauyne: 3CaO · 3Al ₂ O ₃ .CaSO ₄ ), which is an inflatable hydration reaction structure, is added to the Portland cement powder to prevent cracks due to high strength structure and drying shrinkage The addition of the blast furnace slag and the fly ash containing the reactive alumina having the potential hydraulic property and the high hardening agent to the solidifying composition causes the addition of the cement to the cement In order to improve the wettability between CSA swelling agent and cement and hydration heat due to hydration reaction, it is necessary to adjust the amount of plaster and lime to be adjusted according to the field conditions. It is also creating a solidifying agent that can be freely made, er 29Y40) to form an antioxidant film on the cement-ceramic solidifying agent composition, thereby forming a solidifying agent having excellent durability and adhesiveness due to chemical stability between the materials. By the addition of the tartaric acid (tataric acid) (EVA) resin, which can improve the waterproofing and impact resistance of the structure. The addition of alginate, which is dispersed, emulsified and adhesive, It is an object of the present invention to provide a solidifying agent capable of improving the workability and the quality of the solidifying agent by homogenizing the materials.

In order to achieve the object of the present invention, 16 to 20% by weight of CSA intumescent clinker powder, 22% by weight of blast furnace slag, 22% by weight of fly ash, 1 to 7% by weight of anhydrous gypsum, 1 to 6% By weight of a high-hardness, solidifying agent composition comprising 4 to 5.5% by weight of an acrylic resin, 4 to 5.5% by weight of a glutamate adhesive, 3 to 4% by weight of tartaric acid, 2 to 3% by weight of an alginate and 2.5 to 4% The object of the invention can be achieved.

The solidifying agent of the present invention is a high-strength solidifying solidifying agent having a short pot life and is capable of achieving air drastically, and is excellent in permeability and fluidity so that it can form a dense structure by enhancing the filling effect, It is possible to strongly adhere to other materials, prevent material segregation, prevent shrinkage, increase the composition ratio of gypsum and lime and adjust it to suit the field conditions, And by improving the overall physical properties, it can be said to be a high-strength, quick-setting solidification agent having excellent durability.

The present invention relates to a solidifying agent for anchor anchor grout in civil engineering construction, which uses a large amount of blast furnace slag and fly ash obtained as industrial byproducts, and simultaneously promotes curing, crack prevention, strength improvement, durability, The composition ratio of the cement admixture is 20 wt% of cement mortar, 16 to 20 wt% of CSA expansive clinker powder, 22 wt% of blast furnace slag, 22 wt% of fly ash, 1 to 7 wt% of anhydrous gypsum, , The lime composition is 1 to 6 wt%, the tartaric acid is 3 to 4 wt%, the Syntomer 29Y40 adhesive is 4 to 5.5 wt%, the alginate is 2 to 3 wt%, and the EVA resin is 2.5 to 4 wt% to be.

Soilcement, which is used as a solidifying agent for soil improvement, suppresses hydration reaction of cement by organic matter contained in soil. This is because Humic Acid and Fulvic Acid of organic matter react with calcium hydroxide produced by hydration reaction of cement to produce calcium phosphate and calcium pearlbearate and deplete the calcium ion of cement. The hydration reaction of cement is inhibited by hydrophobing cement particles which are not hydrated. The strength of the solidified material is remarkably lowered depending on the content of the corrosive acid or pearlic acid in the organic matter.

Thus, in the clayey soil, the marsh soil, and the muddy soil, which contained a large amount of organic matter, the strength deterioration was inevitable.

In order to solve such problems, the gypsum was introduced into the solidifying agent composition of the present invention in the form of CSA expandable clinker powder.

As in the present invention, when gypsum and slaked lime incorporated in the form of CSA expandable clinker are added to Portland cement together with water, reactive alumina in the gypsum and soil forms ettringite and absorbs a large amount of crystalline water in the soil, At the same time, the Ettringite crystals fill the gaps between the soil particles to make the hardened body compact. Since the influence of corrosive acid is not remarkable in the development of the intensity by the production of ethene gouge, the effect of sulfur trioxide (SO ₃ ) It has a great effect.

Fortent cement is cracked due to drying shrinkage when it is cured in the atmosphere, which has a great influence on the durability of the cemented product. However, with the addition of CSA-based expandable powder, etalinite, which is an inflatable hydrate, is rapidly formed at the beginning of hydration, causing expansion pressure in the hardened cement cement. This expansion pressure compensates for the shrinkage stress of the cement, . Etrinite is also effective for industrial waste containing heavy metals because of its excellent ability to adsorb heavy metals.

As the solidifying agent composition of the present invention, the blast furnace slag is a rapidly quenched slag in a quenched mortar which is slowly cooled in air and slowly quenched in cold water, and is mostly used as a blast furnace cement admixture in recent years. The blast furnace slag is a slag with latent hydraulic properties due to quenching, but it is not hydraulic in itself. However, when a certain irritant is added, the slag will exhibit hydraulic properties such as Ca (OH) ₂ , alkali, CaSO ₄ , Under the conditions of hydraulics.

The blast furnace slag used here is a blast furnace slag having a composition of 31 to 50% of SiO _2, 14 to 20% of Al ₂ O ₃ , 38 to 42% of CaO and 8% of MgO, It is a high quenched slag with high white organic content.

The hydration reaction of Fortent cement added with blast furnace slag is similar to the hydration reaction of Fortent cement alone. However, the hydration reaction of the blast furnace slag is gel-like compared to Fortent cement, thereby increasing the denseness of the cement paste. Since blast furnace slag is mixed with water, the initial hydration reaction is much slower than that of potantand cement, so that the portland cement is responsible for the initial hydration reaction and the hydration of the blast furnace slag added to the portland cement is generated by the hydration reaction of Portland cement (C 3 S ₂ .3H ₂ O), which is a calcium silicate hydrate (CSH), reacts with alkali or calcium hydroxide. The hydration of blast furnace slag - added Fortent Cement is generally divided into two stages: the initial hydration reaction is led by the alkaline hydrate and the calcium hydroxide is the next step.

Generally, the unconfined compressive strength of Potanth cement and blast furnace cement according to the ages of the ages is about 28 days of age. Potential hydration of blast furnace slag is continued to occur. After 3 months, it usually exceeds Fortent cement. The strength is continuously increased over a long period of time.

The addition of blast furnace slag increases the long-term strength of the solidification agent, and the alkali structure and calcium hydroxide produced by the hydration reaction of the cement react with the blast furnace slag to change the structure of the structure. The gap of the structure including calcium hydroxide (CH) It is known that the addition of blast furnace slag to cement greatly increases the durability against sulfate and improves durability against freezing and thawing.

The fly ash added as a composition to the solidifying agent of the present invention is obtained by collecting the fine particles of the ash contained in the waste gas from the pulverized coal combustion boiler with a cotrel stirrer. The fly ash is an artificial pozzolan in place of a conventional natural pozzolan such as a volcanic ash, It is a kind. The pulverized coal of coal is burned instantaneously in the boiler to be burned and melted into a fine spherical glassy material.

Such a fly ash has no favorable production conditions because it does not have the cost of mining, transportation and accumulation at first, and there is no cost of calcining to impart the activity to the cement or the solidifying agent of the present invention.

In addition, the addition of a solidifying composition to the present invention can reduce the unit yield of cement and significantly increase workability, which makes it easy to apply, has a long-term strength enhancement, is resistant to freezing and thawing of a solidifying agent, It is also rich in resistance and has an important position as a pozzolan.

The chemical composition of fly ash used in the present invention is 46.9% of SiO ₂ , 44.47% of Al ₂ O ₃ , 7.3% of Fe ₂ O ₃ , 0.53% of CaO, 1.80% of MgO, 0.99% of SO ₃ , And is not curing itself. However, when water is present, it easily forms a compound having insoluble hardenability by calcium hydroxide generated by hydration of cement at room temperature. In the case of excessive amount generated by hydration, which is one of disadvantages of fortent cement The calcium silicate hydrate is reacted with the calcium hydroxide of the silicate hydrate to form a highly stable silicate hydrate. Thus, the chemical resistance is enhanced, and the fine pozzolanic grains fill the gaps of the solidified body tightly and tightly. In addition, in the present invention, the addition range of the composition ratio of lime and gypsum is further expanded by the composition for adding a solidifying agent. This is because when cement is hydrated and contains a large amount of corrosive acid in the soil for soil improvement or solidification, calcium hydroxide is produced while calcium hydroxide reacts with caustic acid and perlubic acid to generate caustic calcium or pivalic acid calcium, It is necessary to replenish calcium ions which are needed for hydration of cement because it reacts with fly ash having potential hydraulic property to generate insoluble hardenable compound. Therefore, the amount of lime required depending on the content of the corrosive acid can be said to be variable within the composition ratio range.

The gypsum is also contained in the CSA expandable clinker powder in the form of sulfur trioxide (SO ₃ ), which is also required for the cement strength development, but it also reacts with reactive alumina in the soil to produce etrinite, which contributes to the development of solid state strength.

This range is also variable depending on the type of soil, the grout material and the fly ash, thereby broadening the range of the composition ratio.

Synthomer 29Y40, which is obtained by polymerizing silicon resin and polymethylmethacrylate resin and sodium silicate as a solidifying agent composition, has improved adhesion between the solidifying agent composition and concrete, steel structure, etc. As it has an adhesive strength, the physical properties of waterproof, chemical resistance, cracking resistance and creep resistance are improved as a whole.

Tataric Acid has a specific gravity of 1.76 and can be easily dissolved in water to have excellent flowability, which can greatly improve on-site workability and can penetrate deep into the ground, thereby enhancing the overall anchor function.

Alginate has adhesiveness and functions as emulsifying stabilizer to secure homogeneity in solidifying agent composition It is possible to improve the quality of solidifying agent and to improve the workability together with tartaric acid as mentioned above. Alginates include sodium alginate, alginate potash, alginate, and alginate. Alginate and alginate can be used for both adhesiveness and emulsion stabilizers. EVA resin (Ethylene Vinyl Acetate Copolymer) as a composition can prevent the detachment of the solidifying agent by water and remarkably improves waterproof property, impact resistance and cold resistance.

The EVA resin is a copolymer of ethylene and vinyl acetate and can be obtained from an EVA resin having properties of resembling soft polyethylene according to the content of vinyl acetate. The EVA resin has a vinyl acetate content of 2 to 40% Since the EVA resin having a high viscosity is advantageous in the present invention, at least a vinyl acetate content of 20% or more can be expected to be suitable for the present solidifying agent.

The solidifying agent composed of the composition described above is a solidifying agent having high strength and toughness, and has a first pot life of only 10 to 20 minutes and is excellent in fluidity and permeability, and can achieve remarkable shortening of air and is excellent in permeability and fluidity, It is possible to form a dense structure, and it is possible to secure a strong adhesive force by the composition of the adhesive material of Shinthorma, EVA and sodium alginate. Moreover, due to the properties such as adhesiveness, water resistance and waterproofing property, It is possible to adjust the gypsum and lime to be added to the composition as the composition of the solidifying agent and the method of construction suitable for season and underground conditions without causing seizure or shrinkage due to the absence of bleeding. In particular, the use of a large amount of blast furnace slag and fly ash, This type of solidification agent can be used as a solidification material for all grout materials used for JET, RJP, JET grouting, etc. It can be said that it is a solidifying agent that exhibits excellent performance when used in the present invention.

In order to examine the physical properties of the solidifying agent of the present invention, a solidifying agent was prepared with the solidifying agent composition of Example (1) of the present invention.

Example (1)

20 wt% of Portland cement, 16 wt% of CSA expansive clinker powder, 22 wt% of blast furnace slag, 22 wt% of fly ash, 4 wt% of lime, 5 wt% of anhydrous gypsum, 5 wt% To 100 parts by weight of a solidifying composition having 2% by weight of a salt, 38 parts by weight of water was added, and physical properties were measured after 28 days. As a result, physical properties as shown in Table 1 were obtained.

Claims (3)

20 wt% of cement mortar, 16 to 20 wt% of CSA expandable clinker powder, 22 wt% of blast furnace slag, 22 wt% of fly ash, 1 to 7 wt% of anhydrous gypsum, 1 to 6 wt% of lime, %, An adhesive (Syntomer 29Y40) 4 to 5.5 wt%, an EVA resin 2.5 to 4 wt%, and an alginate 2 to 3 wt%. The method according to claim 1,
Wherein the alginate is sodium alginate. The method according to claim 1,
The EVA resin is an EVA resin containing at least a vinyl acetate content of 20% or more.