KR102556265B1 - Eco-friendly low-carbon grout material composition - Google Patents

Abstract

Provided is an eco-friendly low-carbon ground grout material composition. In one embodiment, the composition comprises: a base material which includes cement, blast furnace slag fines, and supercritical fluidized bed boiler fly ash; a hardening-accelerating agent which controls gelation time in one-liquid state; a setting control agent which controls setting time; and a water reducing agent which improves permeability into the ground, wherein the base material may include 5 to 20 parts by weight of cement, 40 to 60 parts by weight of blast furnace slag, and 20 to 50 parts by weight of fly ash.

Description

Eco-friendly low-carbon ground grout material composition {ECO-FRIENDLY LOW-CARBON GROUT MATERIAL COMPOSITION}

The present invention relates to an eco-friendly low-carbon ground grout material composition.

Grouting refers to a construction method of injecting filler into cracks or cavities in the ground to prevent leakage or stabilize soil during civil engineering or construction work. By the grouting described above, it is possible to smoothly perform the foundation work by blocking water stagnant or flowing in the ground, and it is possible to harden the soft ground. The injection material used for the above grouting is referred to as grout or grout material.

Types of the grout include cement-based grout using cement, water, clay, etc., iron-based grout mainly used for filling steel foundations or filling and reinforcing joints, asphalt-based grout mainly used for water and soil stabilization, and chemical grout, etc. However, the cement-based grout has a disadvantage in that toxic substances contained in the cement are eluted and contaminate the soil. In addition, the chemical grout has a problem in that the grout is leached over time, so that the injected grout loses its original function and contaminates groundwater.

In order to improve these problems, recently, the use of chemical grout chemically modified chemical grout is increasing. The chemical grout described above can be classified into an acidic silica sol chemical grout and a neutral silica sol chemical grout. The liquid chemical grout is composed of liquid A and liquid B, and among them, sodium silicate (three types of water glass) is used as liquid chemical, and cement is mainly used as liquid chemical B. However, the cement sol has a problem in that it pollutes groundwater due to its high toxicity. In addition, the method of grouting by mixing sodium silicate and cement has a very slow gel time, which is the time it takes for a chemical solution in a sol state to become a gel state, and the order quality is low, so the scope of application is low. The disadvantage is that is limited. In order to compensate for this disadvantage, when sodium silicate is used, the gel time is shortened by adding sulfuric acid, sodium bicarbonate, and the like.

On the other hand, the cement used as the liquid B has a problem of not only environmental pollution by heavy metals, but also emission of a large amount of carbon dioxide during cement production.

Accordingly, attempts have been made in the technical field of the present invention to reduce the amount of cement or not to use cement, but as the amount of cement is reduced, condensation is delayed and the injected grout flows down into groundwater and is washed away. did When the cement content was increased again to compensate for this, the problem of filling the cavity due to the limitation of ground penetration injection due to the large cement particle size and low material separation resistance occurred.

Therefore, it is necessary to develop a low-carbon ground grout material capable of achieving excellent physical properties while significantly reducing the amount of cement used.

The present invention is intended to solve the above problems, while significantly reducing the amount of cement used to reduce greenhouse gas emissions, while having excellent fluidity and condensation hardening characteristics of grout materials, low bleeding rate, excellent penetration into the ground, and durability It is to provide an improved eco-friendly low-carbon ground grout material.

The present invention, in order to solve the above problems, a main material containing cement, blast furnace slag fine powder and supercritical fluidized bed boiler fly ash; rapid economy for controlling the gelation time in a one-component state; a setting regulator for controlling setting time; And a water reducing agent for improving permeability into the ground; wherein the main material is an eco-friendly low-carbon ground grout material comprising 5 to 20 parts by weight of cement, 40 to 60 parts by weight of blast furnace slag, and 20 to 50 parts by weight of fly ash. composition is provided.

According to one embodiment of the present invention, compared to ground grout materials using conventional cement, the amount of cement used is reduced to 20% or less by weight, and industrial by-products including blast furnace slag fine powder and supercritical fluidized bed boiler fly ash instead of cement can reduce greenhouse gases by more than 80%.

In addition, according to one embodiment of the present invention, environmental pollution caused by cement toxicity can be reduced by reducing the amount of cement used by 80% or more based on weight, and the efficiency of ground grouting construction is improved because the fine powder content is high. can improve

In addition, according to an embodiment of the present invention, while actively utilizing industrial by-products having a high fine powder content composed of blast furnace slag fine powder and supercritical fluidized bed boiler fly ash, material separation is achieved by exhibiting the characteristics of having a faster setting time than cement. By improving the resistance, the filling rate of the cavity is improved compared to the prior art, thereby reducing the bleeding rate, and also by exhibiting a higher disorganized volume than cement, it is possible to reduce the total amount of ground grout material used.

1 shows test results according to an embodiment of the present invention, and FIG. 2 shows test results of conventional Portland cement.
3 to 6 show the results of measuring material separation resistance for the present invention and conventional Portland cement.

Hereinafter, embodiments of the present invention are described in detail. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms, but only the present embodiments make the disclosure of the present invention complete and provide the content of the present invention to those skilled in the art. It is provided to inform you more completely.

In this specification, when an element is referred to as being positioned 'above' or 'below' another element, this means that the element is positioned directly 'above' or 'below' another element, or an additional element is present between them. It includes all meanings that can be intervened. In this specification, the term 'upper' or 'lower' is a relative concept established from the observer's point of view, and if the observer's point of view changes, 'upper' may mean 'lower', and 'lower' may mean 'upper' could mean

In a plurality of drawings, like reference numerals denote substantially the same elements. In addition, terms such as 'comprise' or 'have' are intended to designate that the described feature, number, step, operation, component, part, or combination thereof exists, but one or more other features, numbers, or steps However, it should be understood that it does not preclude the possibility of existence or addition of operations, components, parts, or combinations thereof.

Meanwhile, the term grout or grout material referred to in the present invention means an injection material used for grouting.

On the other hand, the eco-friendly low-carbon ground grout material of the present invention is implemented for ground reinforcement by blocking water storage at the bottom of the ground, ranging from hydraulic structures such as embankments, reservoirs, and river embankments to large-scale construction and civil engineering works such as subways, tunnels, and road construction. It can be used for order grouting work.

On the other hand, the term bleeding referred to in the present invention refers to a phenomenon in which cement and aggregate settle and water rises and collects on the upper surface of the poured concrete.

On the other hand, the one-component grout material of the present invention may be applied.

The inventors of the present invention have problems with cement grout materials conventionally used in seawall, reservoir, and river embankment construction, such as excessive emission of greenhouse gases, environmental pollution due to cement toxicity, limitations in ground penetration and injection due to the large particle size of cement, and After experiencing various trials and errors in order to solve the filling defect of the cavity due to low material separation resistance, the present invention was completed.

The inventors of the present invention actively utilize industrial by-products such as blast furnace slag fine powder and fly ash to reduce the amount of cement used for reducing greenhouse gas emissions. It was confirmed that the problem of washing off occurred. In order to solve this problem, the inventors of the present invention adjust the setting time of the grout material to secure the time required for injection, but to start condensation after the injection is completed, so that the loss of the grout material and the excessive range of injection are not achieved. material was to be developed. In addition, the inventors of the present invention are a one-component ground grout that is mixed with water in one mixer and injected into the ground to be constructed with one injection pump for on-site quality control and simplification of injection equipment (mixer and pump) material was to be developed.

On the other hand, the inventors of the present invention, in order to solve the above technical problems, calcium sulfoaluminate (4CaO.3Al ₂ O ₃ .SO ₃ ), calcium flow aluminate (11CaO.7Al ₂ O ₃ .CaF ₂ ) , Alumina cement system (CaO.Al ₂ O ₃ , CaO.2Al ₂ O ₃ ), etc., appropriately used fast-hardening materials and retardants, or by using quick-setting liquids such as water glass or silica sol, the gel time is controlled from several tens of seconds to several hours. It is possible to do this, but it has been found that the configuration of the equipment is complicated and the economical efficiency is low because the two-component injection equipment must be installed.

Accordingly, the inventors of the present invention develop a technique for appropriately controlling the setting time by optimal combination of cement, blast furnace slag powder, supercritical fluidized bed boiler fly ash, calcium aluminate, gypsum, setting regulator and water reducing agent, developed an eco-friendly low-carbon ground grout material that significantly lowers greenhouse gas emissions compared to conventional cement, satisfies the fluidity and condensation hardening characteristics of the grout material, is environmentally friendly, has low bleeding rate, excellent permeability to the ground, and improved durability. .

The present invention, a main material including cement, blast furnace slag fine powder and supercritical fluidized bed boiler fly ash, a rapid economy for controlling gelation time in a one-component state, a setting control agent for controlling setting time, and improving permeability into the ground Contains a water reducing agent for

As the cement, a fine particle cement having an average particle diameter of 20 μm or less may be applied by crushing or classifying various Portland cements such as crude steel or crude steel. For example, 15 μm, for example, 10 μm or less may be applied. If the average particle diameter of the applied cement exceeds 20 μm, problems such as poor permeability during injection and insufficient improvement of the initial curing reaction after setting may occur.

The blast furnace slag fine powder is obtained by pulverizing and finely pulverizing the vitreous phase obtained by quenching molten slag discharged from a blast furnace with water or the like in the course of steel manufacturing, and has latent hydraulic properties and hardens by the stimulating effect of alkali. What you have can be applied.

The composition of the blast furnace slag fine powder may be 35 to 50% by weight of CaO, 10 to 25% by weight of Al ₂ O ₃ and 31 to 40% by weight of SiO ₂ . For example, a CaO content of 40 to 50 wt%, an Al ₂ O ₃ content of 10 to 25 wt%, and a SiO ₂ content of 31 to 40 wt% may be applied. Although the blast furnace slag fine powder contains impurities such as MgO, TiO ₂ , Fe ₂ O ₃ , Na ₂ O, and K ₂ O, it can be accepted as long as it does not impair the effect of the present invention.

By containing the blast furnace slag fine powder in the grout material of the present invention, high injectability and long-term strength developability are imparted. The fine powder of the blast furnace slag may have an average particle diameter of 10 μm. If the thickness exceeds 10 μm, the short-term and long-term strength development may not be sufficiently improved along with the decrease in permeability during injection.

The supercritical fluidized bed boiler fly ash is a binder that replaces cement, and may include fly ash discharged from a supercritical fluidized bed boiler operating a boiler in a supercritical state. A supercritical fluidized bed boiler may refer to a boiler that generates power by applying critical conditions (225.5 kg/cm ² vapor pressure, 374° C. steam temperature) in which water is converted into steam. Common fly ash is fly ash discharged from a coal-fired power plant by injecting fuel (coal pulverized into fine powder) and air and burning it (1,200-1,500 ° C). It is fly ash discharged through the process of completely burning coal (760~950℃) while continuously circulating heat by injecting lime at the same time. On the other hand, the supercritical fluidized bed boiler fly ash may refer to fly ash discharged through a process of burning fuel (coal) in a supercritical state by injecting oxygen instead of air in a supercritical fluidized bed boiler. These fly ash have a common point in that they are fly ash discharged from power generation facilities using coal as fuel, but the chemical composition and physical properties of fly ash are different due to the specific treatment method of power generation facilities. In particular, the supercritical fluidized bed boiler fly Ash may contain 20% or more of CaO, 15% or more of Fe ₂ O ₃ , and 8% or more of SO ₃ components. CaSO ₄ by CaO and SO ₃ reacts with Ca(OH) ₂ and C ₃ A to form Ettringite hydrate, contributing to the enhancement of initial strength, and Fe ₂ O ₃ combines with CaO to hydrate May form some reactive calcium ferrite (2CaO.Fe ₂ O) minerals. Calcium ferrite mineral is a hydrate that is not formed in general fly ash or is only partially produced, and is a hydrate formed when using supercritical fluidized bed boiler fly ash having a high content of Fe ₂ O ₃ .

In the present invention, the supercritical fluidized bed boiler fly ash contains 10 to 20 parts by weight of Fe ₂ O ₃ , 5 to 20 parts by weight of SO _{3 and} 1 to 10 parts by weight of Free CaO per 100 parts by weight of the supercritical fluidized bed boiler fly ash. It can be applied that the average particle diameter is 10 μm or less. In the composition of the present invention, when free CaO is more than 10 parts by weight, initial strength may be poor, and when it is less than 1 part by weight, the effect of using free CaO is not secured.

In the ground grout material composition of the present invention, the contents of cement, blast furnace slag fine powder, and supercritical fluidized bed boiler fly ash are 5 to 20 parts by weight of cement, 40 to 60 parts by weight of blast furnace slag powder, and 20 to 50 parts by weight of fly ash. desirable.

If the cement content is less than 5 parts by weight, the initial curing reaction after setting is delayed, and if it is more than 20 parts by weight, the viscosity of the injection material as a suspension increases and permeability may decrease, eco-friendliness and economic efficiency are reduced, and heavy metal contamination An increase is also a concern.

If the content of the blast furnace slag fine powder is less than 40 parts by weight, economic efficiency is poor, and if it exceeds 60 parts by weight, the reactivity may be reduced, making it difficult to secure initial strength.

If the content of the supercritical fluidized bed boiler fly ash is less than 20 parts by weight, material separation resistance is poor, and if it is more than 50 parts by weight, the reactivity is poor, and when the injection material is used as a suspension, the viscosity increases and the injectability may deteriorate.

The grout material composition of the present invention may further include a rapid economy for controlling the gelation time in a one-component state, and the rapid economy may be included in 1 to 10 parts by weight based on 100 parts by weight of the mixture of the main material and the rapid economy.

A rapid economy may be applied that is a mixture of calcium aluminate and gypsum.

Calcium aluminate applied in the present invention is obtained by melting limestone and bauxite as raw materials in an electric furnace or the like and finely pulverized to an average particle diameter of 10 μm or less, and may have the formula 12CaO·7Al ₂ O ₃ .

The fineness of calcium aluminate is preferably 10 μm or less in average particle diameter in terms of permeability, and if the average particle diameter is 10 μm or more, there is a concern that the permeability may be poor.

The gypsum applied in the present invention may include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum, and in particular, may include natural gypsum, chemical gypsum such as phosphate gypsum, flue gas desulfurization gypsum and hydrofluoric gypsum, or gypsum obtained through heat treatment. On the other hand, in the present invention, it is preferable to use natural anhydrite having the advantage of high strength development.

The average particle size of gypsum is preferably 10 μm or less, and if it is more than 10 μm, the permeability may decrease during injection.

The content of gypsum may be 50 to 200 parts by weight based on 100 parts by weight of calcium aluminate, for example, 70 to 150 parts by weight may be applied. If it is less than 50 parts by weight, short-term strength may be reduced, and if it is more than 200 parts by weight, the problem of lowering permeability may occur.

The rapid economy may be included in 1 to 10 parts by weight based on 100 parts by weight of the mixture of the main ingredient and the rapid economy. If the ratio of the total of calcium aluminate and gypsum is less than 1% by weight, it is difficult to develop initial strength, and if the ratio of the total of calcium aluminate and gypsum exceeds 10 parts by weight, it is difficult to control the curing time and there is a risk of deterioration in permeability. .

The grout material composition of the present invention may further include a setting control agent to control the setting time, that is, set the setting time in advance and apply it, and may include 0.05 to 1 part by weight based on 100 parts by weight of the main material and the rapid economy mixture. can

In the present invention, the setting control agent is aluminates such as sodium aluminate and potassium aluminate, carbonates such as sodium carbonate and potassium carbonate, hydroxides such as sodium hydroxide and potassium hydroxide, sulfates such as aluminum sulfate, iron sulfate and alum, sodium silicate, Silicates such as potassium silicate, phosphates such as sodium phosphate, calcium phosphate and magnesium phosphate In addition, inorganic salts such as borates such as lithium borate and sodium borate, citric acid, gluconic acid, tartaric acid, or sodium, potassium and calcium salts thereof, etc. Of organic acids and sugars may be considered, and one or two or more of them may be mixed. Among them, it is preferable to apply a mixture of carbonate and organic acid in order to secure a predetermined setting time and hardening time required for the grout material composition of the present invention. At this time, sodium salt and potassium salt may be applied as the salt.

On the other hand, in the case of using a carbonate and an organic acid in combination, the amount of the carbonate may be applied in an amount of 50 to 1,000 parts by weight based on 100 parts by weight of the organic acid. If it is less than 50 parts by weight, there is a risk of deterioration in the development of initial strength, and if it exceeds 1,000 parts by weight, it may be difficult to obtain the delay time required for construction.

The content of the setting regulator may be adjusted according to the required setting time, and may include, for example, 0.05 to 1 part by weight based on 100 parts by weight of the main material and the rapid economy mixture. If it is less than 0.05 parts by weight, it may be difficult to secure a curing time, and if it exceeds 1 part by weight, the curing time is unnecessarily long and may be non-uniformly solidified.

The grout material composition of the present invention may further include a water reducing agent to improve permeability into the ground, and 100 parts by weight of cement may be conventionally included in 20 to 30 parts by weight.

In the present invention, high-performance water reducing agents such as naphthalene sulfonates, ligni sulfonates, melamine sulfonates, and polycarboxylic acids may be applied as the water reducing agent, and among them, melanin sulfonates are preferable in terms of lowering the viscosity of the ground grout material. can be applied

The content of the water reducing agent can be applied at 20 to 30 parts by weight calculated as solid content with respect to 100 parts by weight of cement. If it is less than 20 parts by weight, there is a concern that the permeability will be poor in the case of a low water ratio, and if it exceeds 30 parts by weight, the viscosity of the ground grout material will decrease. There is a possibility that it will rise and the permeability will be poor.

The amount of water used in the case of using the ground grout material as a suspension is not particularly limited as long as it can be pumped, but is preferably 100 to 1,000 parts by weight based on 100 parts by weight of the mixture of the main material and the rapid economy, and less than 100 parts by weight of the suspension. Viscosity may increase and permeability may be poor, and if it exceeds 1,000 parts by weight, a problem of not being cured may occur.

As the mixing method and injection method of the ground grout material, commonly used methods such as the single pipe lot method, the single pipe strainer method, the double pipe single pipe method, the double pipe double pipe method, and the double pipe double packer method may be applied depending on the type of injection pipe, but are limited thereto. It doesn't work.

It is preferable that the maximum particle diameter of the ground grout material in the present invention does not exceed 20 μm. For example, the average particle diameter may be less than 15 μm and, for example, may be controlled to 10 μm. If the maximum particle diameter exceeds 20 μm, it may be difficult to inject into fine gaps depending on the geology of the ground.

On the other hand, the ground grout material in the present invention has a gelation time of 15 hours or less, measured by the time the suspension does not flow, a time until the suspension reaches a depth of 20 cm in the sand layer of 22 minutes or less, and a hardening time of the suspension after penetration. 5 hours or less, and combinations thereof. According to the combination of the technical components of the present invention, the short-term strength is improved when the gelation time is 15 hours or less, and the permeability is improved when the time until the suspension reaches a depth of 20 cm in the sand layer exceeds 22 minutes However, if the hardening time of the suspension after infiltration is 5 hours or less, the grout material may not be lost due to environmental factors.

In this way, when the one-component eco-friendly low-carbon ground grout material of the present invention is applied, unlike conventional one-component grout materials using general Portland cement and bentonite, a large amount of industrial by-products including blast furnace slag powder and supercritical fluidized bed boiler fly ash are used. It is possible to minimize the use of cement, greatly reduce the generation of carbon dioxide, which is a greenhouse gas, and prevent environmental pollution caused by the toxicity of cement. In addition, since the present invention can reduce the bleeding rate without using bentonite by adjusting the setting time and viscosity of the ground grout material to improve material separation resistance, it is possible to fill the void by allowing condensation hardening to occur after the injection operation is completed. there will be Accordingly, even when a large number of cavities and voids are formed in the lower part of the embankment due to erosion and scour caused by leaks and stored water, such as reservoirs, embankments, and river embankments, loss of the injected grout material can be prevented, and excessive facilities for injection can be prevented. It is unnecessary, and efficient injection is possible even to an excessive range.

The ground grout material of the present invention has a higher powder size due to its smaller particle size than general Portland cement, so it is easy to penetrate into the ground, and the disturbed volume is larger than that of general Portland cement. In this case, the amount of ground grout material required can be reduced.

Hereinafter, embodiments of the present invention will be described. Examples are examples of embodiments of the present invention, and the present invention is not construed as being limited to the examples.

Examples 1 to 5

Cement, blast furnace slag fine powder, supercritical fluidized bed boiler fly ash, calcium aluminate, and gypsum were classified and pulverized. After that, 97 parts by weight of the main material consisting of 15 parts by weight of cement, 50 parts by weight of blast furnace slag fine powder, and 35 parts by weight of supercritical fluidized bed boiler fly ash and 3 parts by weight of a rapid economy were mixed. At this time, the rapid economy was prepared by mixing calcium aluminate and gypsum at a ratio of 1:1. A grout composition according to Example 1 was prepared by additionally mixing 0.4 parts by weight of a setting control agent with 100 parts by weight of the mixture of the main material and the rapid economy, and then additionally mixing the water reducing agent to 20% of the cement weight. At this time, in Examples 2 to 5, grout material compositions were prepared in the same manner as in Example 1, as shown in Table 6, except that the average particle size of the grout material composition was controlled differently from Example 1.

Thereafter, water was added between 100 and 1000 parts by weight per 100 parts by weight of the grout material composition to prepare a suspension. The specifically used materials are as follows.

Cement: Ordinary Portland cement ground grade

Fine powder of blast furnace slag: 42% by weight of CaO, 13% by weight of Al ₂ O ₃ , 34% by weight of SiO ₂ , and other 11% by weight of granulated blast furnace slag pulverized product

Supercritical fluidized bed boiler fly ash: CaO 24% by weight, Al ₂ O ₃ 13% by weight, SiO ₂ 28% by weight, Fe ₂ O ₃ 15% by weight Other fly ash generated in a supercritical fluidized bed boiler having a composition of 20% by weight pulverized product

Calcium aluminate: A non-pulverized product of calcium aluminate in an amorphous state having a composition of 51% by weight of CaO, 44% by weight of Al ₂ O ₃ , and 5% by weight of others

Gypsum: Unground natural anhydrite

Water reducing agent: melamine sulfonate-based powder

Coagulation regulator: a mixture consisting of 100% by weight of citric acid and 300% by weight of potassium carbonate

Sand: Jumunjin silica sand

water: tap water

Experimental example 1

The penetration depth into the simulated sand layer was measured with the suspensions of the grout compositions according to Examples 1 to 5 in the following manner, and the results are shown in Table 1 below.

Average particle size: The average particle size was measured by laser diffraction (using a mastersizer 2000 from Marvern).

Penetration depth: 200 ml of suspension was slowly injected into the top surface of a simulated sand layer prepared by filling polyethylene vinyl with a diameter of 5 cm with Jumunjin silica sand to a height of 20 cm, and the depth of penetration into the simulated sand layer was measured after 2 hours. .

Time to reach 20 cm (time to reach 20 cm): In the measurement of penetration depth, the suspension was injected into the upper surface, and the time until the suspension penetrated 20 cm of the simulated sand layer was measured.

Average particle size (㎛) Penetration depth (cm) Time to reach 20 cm (minutes) note Experimental example 1-1 5 >20 15 Example 1 Experimental example 1-2 7 >20 18 Example 2 Experimental example 1-3 10 >20 22 Example 3 Experimental Example 1-4 15 16 - Example 4 Experimental Example 1-5 20 11 - Example 5

-: Did not reach 20 cm

Referring to Table 1, it was found that the grout material composition of the present invention had poor permeability when the average particle size was less than 15 μm, so that the suspension could not penetrate up to 20 cm of the simulated sand layer.

That is, the grout material composition of the present invention was found to have improved permeability as the average particle size decreased within the range of 5 μm or more and less than 15 μm.

Examples 6 to 10 and Comparative Examples 1 to 2

Examples 6 to 10 and Comparative Example 1 in the same manner as in Example 3, except that the content of the main material, that is, the content of cement, blast furnace slag fine powder, and supercritical fluidized bed boiler fly ash, was changed in Example 3. A grout material composition according to Comparative Example 2 was prepared. The specific content is shown in Table 6.

Experimental Example 2

The suspensions of the grout compositions according to Examples 3, 6 to 10 and Comparative Examples 1 to 2 were evaluated for gelation time and permeability, and the results are shown in Table 2 below.

At this time, the gelation time evaluation method is as follows.

Gelation time: The time from when the suspension is poured into a cup to a state where the suspension does not flow even when the cup containing the suspension is tilted

Gelation time (hours) Penetration depth (cm) Time to reach 20 cm (minutes) note Experimental example 2-1 24 >20 5 Comparative Example 1 Experimental Example 2-2 4 >20 12 Comparative Example 2 Experimental Example 2-3 4 >20 22 Example 3 Experimental example 2-4 7 >20 13 Example 6 Experimental Example 2-5 5 >20 17 Example 7 Experimental example 2-6 3 >20 20 Example 8 Experimental example 2-7 6 >20 14 Example 9 Experimental Example 2-8 2 18 - Example 10

-: Did not reach 20 cm

Referring to Table 2, when the composition of the main material according to the embodiment of the present invention is included in the grout material composition, it can be confirmed that the permeability is improved.

In addition, since the grout material composition of the present invention can secure the gelation time in a one-liquid state, the working time is shortened within the expected range, and it can be confirmed that the grout material composition is rapidly cured after penetration.

On the other hand, the grout material composition according to Comparative Example 2 exhibited excellent permeability and gelling properties, but since it does not contain cement, there may be a problem that the injected grout flows down into groundwater and is washed away due to delay in setting.

Examples 11 to 13 and Comparative Example 3

Grout material compositions according to Examples 11 to 13 and Comparative Example 3 were prepared in the same manner as in Example 3, except that the content of the rapid economy was changed in Example 3. The specific content is shown in Table 6.

Experimental Example 3

The suspensions of the grout materials according to Examples 3, 11 to 13 and Comparative Example 3 were evaluated for gelation time, permeability, and initial strength, and the results are shown in Table 3 below.

At this time, the initial strength was measured as the compressive strength at a curing time of 1 day.

In addition, the hardening time after penetration was measured as the time from reaching the final penetration depth to hardening. Specifically, a transparent bag made of polyethylene vinyl with an open top of 5 cm in diameter and 20 cm in length was filled with Jumunjin silica sand, and a suspension of the grout material composition according to the experimental example was injected from the top so that the grout composition penetrated into the silica sand layer. Then, the time in a non-flowing state was measured by applying an external force around the final penetration depth of the transparent bag.

gelation time
(hour) penetration depth
(cm) Time to reach 20 cm (minutes) Curing time after penetration initial strength
(N/mm ² ) note Experimental Example 3-1 30 >20 10 8 immeasurable Comparative Example 3 Experimental Example 3-2 4 >20 22 3 0.19 Example 3 Experimental example 3-3 15 >20 14 5 0.09 Example 11 Experimental Example 3-4 3 16 - 2 0.28 Example 12 Experimental example 3-5 One 7 - One 0.41 Example 13

-: Did not reach 20 cm

Referring to Table 3, it can be confirmed that the permeability and initial strength are improved within the composition range of the main material and the rapid economy according to the embodiment of the present invention in the grout material composition.

In addition, since the grout material composition of the present invention can secure the gelation time in a one-liquid state, the working time is shortened within the expected range, and it can be confirmed that the grout material composition is rapidly cured after penetration.

Examples 14 to 16 and Comparative Example 4

Grout material compositions according to Examples 14 to 16 and Comparative Example 4 were prepared in the same manner as in Example 3, except that the content of the setting control agent was changed in Example 3. The specific content is shown in Table 6.

Experimental Example 4

Gelation time and permeability were evaluated with the suspensions of the grout compositions according to Examples 14 to 16 and Comparative Example 4, and the results are shown in Table 4 below.

gelation time
(hour) penetration depth
(cm) Time to reach 20 cm (minutes) Curing time after penetration note Experimental Example 4-1 NA 2 - 0.1 Comparative Example 4 Experimental Example 4-2 3 15 - 2 Example 14 Experimental Example 4-3 5 >20 16 3 Example 15 Experimental Example 4-4 11 >20 11 4 Example 16

-: Did not reach 20 cm

Referring to Table 4, it can be seen that the permeability is improved when the composition of the grout material includes the composition of the rapid economy in the main material according to the embodiment of the present invention. However, the suspension of the grout material composition according to Comparative Example 4 did not gel.

In addition, since the grout material composition of the present invention can secure the gelation time in a one-liquid state, the working time is shortened within the expected range, and it can be confirmed that the grout material composition is rapidly cured after penetration.

Examples 17 to 19

Grout material compositions according to Examples 17 to 19 were prepared in the same manner as in Example 3, except that the content of the water reducing agent was changed in Example 3. The specific content is shown in Table 6.

Experimental Example 5

Gelation time and permeability were evaluated with the suspensions of the grout material compositions according to Examples 3 and 17 to 19, and the results are shown in Table 5 below.

gelation time
(hour) penetration depth
(cm) Time to reach 20 cm (minutes) Curing time after penetration note Experimental example 5-1 4 >20 22 3 Example 3 Experimental Example 5-2 2 10 - 0.8 Example 17 Experimental example 5-3 5 15 - 2 Example 18 Experimental Example 5-4 13 >20 12 4 Example 19

-: Did not reach 20 cm

Referring to Table 5, it can be confirmed that the permeability is improved when the grout material composition includes the composition of the water reducing agent in the main material according to the embodiment of the present invention.

In addition, since the grout material composition of the present invention can secure the gelation time in a one-liquid state, the working time is shortened within the expected range, and it can be confirmed that the grout material composition is rapidly cured after penetration.

Experimental Example 6

The results of measuring the density, fineness, setting time, bleeding rate, and compressive strength of the grout material composition according to Example 7 are shown in FIG. 1, and the results of measuring the bleeding rate of general Portland cement are shown in FIG.

Referring to FIG. 1, the grout material composition according to one embodiment of the present invention has a density of 2.88 mg/m ³ , which is lower than that of general Portland cement (3.15 g/cm ³ ), and a fineness of 6,350 cm ² /g. In addition, despite the very low cement content, the setting time was 4 minutes, which was faster than general Portland cement.

1 and 2, after preparing the grout material composition according to an embodiment of the present invention, the amount of water was added to be 1: 1, and the bleeding rate was measured and the result was 1%. It was confirmed that the bleeding rate for cement was much lower than 36%, which was the result of measurement.

In addition, it was found that the compressive strength of the grout material according to one embodiment of the present invention satisfies the KS standard of ordinary Portland cement.

Experimental Example 7

In order to confirm material separation resistance to the grout material composition according to Example 7 and general Portland cement, the bleeding rate for up to 3 hours was measured.

The mixing ratio used in the bleeding test was carried out in a volume ratio rather than a weight ratio, and the volume mixing ratio of water and cement was set at 2:1. The mixing ratio at this time is 2 packets (80kg) of general Portland cement in 108 liters of water in the case of general Portland cement, and 2 packets (60kg) of ground grout material in 108 liters of water in the case of ground grout material.

In the case of the ground grout material, the disorganized volume was 0.89 cm ³ /g, whereas in the case of general Portland cement, the disorganized volume was 0.67 cm ³ /g. Therefore, it can be seen that the ground grout material has the same volume even if only 75% of the amount of general Portland cement is added, so that the amount of cement used can be significantly reduced.

After the ground grout material with the volume mixing ratio set to 2: 1 was put into a 1000 ml mass cylinder, the bleeding rate was measured while checking the state for up to 3 hours at intervals of 1 hour, and the results are shown in FIGS. 3 to 6 shown in That is, the state at the start of the experiment is shown in Fig. 3, the state after 1 hour in Fig. 4, the state after 2 hours in Fig. 5, and the state after 3 hours in Fig. 6, respectively. At this time, the comparison group was placed on the left side and the grout material of the present invention on the right side on the same plane.

As shown in FIGS. 3 to 6, the eco-friendly low-carbon grout material according to an embodiment of the present invention has a bleeding rate after 3 hours, although the bleeding rate is measured by reducing the amount of material used by 25% compared to general Portland cement. Portland cement was 37%, and the eco-friendly low-carbon grout material according to one embodiment of the present invention was 11%.

Therefore, it can be seen that when another eco-friendly low-carbon grout material is used in one embodiment of the present invention, more voids can be filled while reducing the amount of cement used by 25% or more.

cement
(parts by weight) blast furnace slag
fine powder
(parts by weight) fly ash
(parts by weight) fast economy
(parts by weight) Congealing agent (parts by weight) water reducing agent
(parts by weight) particle
Size (μm) Example 1 15 50 35 3 0.4 3 5 Example 2 15 50 35 3 0.4 3 7 Example 3 15 50 35 3 0.4 3 10 Example 4 15 50 35 3 0.4 3 15 Example 5 15 50 35 3 0.4 3 20 Example 6 20 60 20 3 0.4 3 10 Example 7 20 50 30 3 0.4 3 10 Example 8 20 40 40 3 0.4 3 10 Example 9 10 60 30 3 0.4 3 10 Example 10 10 40 50 3 0.4 3 10 Example 11 15 50 35 One 0.4 3 10 Example 12 15 50 35 5 0.4 3 10 Example 13 15 50 35 10 0.4 3 10 Example 14 15 50 35 3 0.1 3 10 Example 15 15 50 35 3 0.5 3 10 Example 16 15 50 35 3 1.0 3 10 Example 17 15 50 35 3 0.4 1.5 10 Example 18 15 50 35 3 0.4 1.75 10 Example 19 15 50 35 3 0.4 4.5 10 Comparative Example 1 0 100 0 3 0.4 3 10 Comparative Example 2 0 0 100 3 0.4 3 10 Comparative Example 3 15 50 35 0 0.4 3 10 Comparative Example 4 15 50 35 3 0 3 10

*) The fly ash refers to supercritical fluidized bed boiler fly ash

As described above, the detailed description of the present invention has been made by the embodiments with reference to the accompanying drawings, but since the above-described embodiments have only been described as preferred examples of the present invention, it is believed that the present invention is limited only to the above embodiments. Should not be understood, the scope of the present invention should be understood as the following claims and equivalent concepts.

For example, the drawings are schematically shown with each component as the main body to aid understanding, and the thickness, length, number, etc. of each component shown may differ from the actual one in the progress of drawing. In addition, the material, shape, dimensions, etc. of each component shown in the above embodiment are only examples and are not particularly limited, and various changes are possible within a range that does not substantially deviate from the effect of the present invention.

Claims (6)

A main material containing cement, blast furnace slag powder and supercritical fluidized bed boiler fly ash;
rapid economy for controlling the gelation time in a one-component state;
a setting regulator for controlling setting time; and
water reducing agents to improve permeability into the ground;
including,
The main material includes 5 to 20 parts by weight of cement, 40 to 60 parts by weight of blast furnace slag, and 20 to 40 parts by weight of fly ash,
The rapid economy includes 100 parts by weight of calcium aluminate and 50 to 200 parts by weight of gypsum,
The content of the quick economy is 1 to 3 parts by weight based on 100 parts by weight of the mixture of the main ingredient and the quick economy, and the content of the setting control agent is 0.4 to 0.5 parts by weight based on 100 parts by weight of the mixture of the main ingredient and the quick economy. And, the content of the water reducing agent is 20 to 30 parts by weight based on 100 parts by weight of the cement, and the maximum particle diameter is 5 to 10 μm.
delete delete The method of claim 1,
The supercritical fluidized bed boiler fly ash is fly ash discharged from a process of burning coal fuel in a supercritical state while injecting oxygen, and includes 10 to 20% by weight of Fe ₂ O ₃ , 5 to 20% by weight of SO ₃ , and free An eco-friendly low-carbon ground grout material composition containing 1 to 10% by weight of CaO and having an average particle diameter of 10 μm or less.
The method of claim 1,
The eco-friendly low-carbon ground grout material composition comprising the setting control agent comprising a carbonate and an organic acid.
The method of claim 1,
a gelling time measured by the time during which the suspension of the grout material composition does not flow is 15 hours or less;
that the time until the suspension of the grout material composition reaches a depth of 20 cm in the sand layer is 22 minutes or less;
The hardening time of the suspension after penetration, measured as the time from reaching the final penetration depth of the grout material composition to hardening, is 5 hours or less; and
combinations thereof;
Eco-friendly low-carbon ground grout material composition having any one of the following characteristics.

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