KR20100126985A - A high strength concrete composition with fire resistance and concrete using it - Google Patents

Abstract

PURPOSE: A high-strength refractory concrete composition and concrete produced therefrom are provided to secure the dispersibility of the composition by adding a reinforcing fiber to the concrete. CONSTITUTION: A high-strength refractory concrete composition contains 900-1200kg/m^3 of binder containing cement, 140-170kg/m^3 of water, 400-800kg/m^3 of fine aggregate, 6000-1200kg/m^3 of coarse aggregate, and 0.1-5.0kg/m^3 of thick reinforcing fiber. The reinforcing fiber is coated with a coating solution containing a polyhydric alcohol ester lubricant, a nonionic surfactant, and an antistatic agent.

Description

A high strength concrete composition with fire resistance and concrete using it}

The present invention relates to a concrete composition having excellent fire resistance and at the same time excellent in fire resistance and concrete prepared by using the same, and more specifically, to ensure that the dispersibility is ensured by incorporating the fiber reinforcement treated on the surface of the coating liquid into the concrete Construction properties, that is, fluidity, filling properties are secured, the strength of more than 120MPa and at the same time the explosion phenomenon can be prevented relates to a concrete composition excellent in fire resistance and concrete produced using the same.

Generally, the reinforced concrete structure refers to a structure made to support load while reinforcing reinforcing steel in concrete formed by mixing Portland cement, aggregate, and water in a constant ratio. Such reinforced concrete structures have excellent advantages in economics, workability, durability, and molding, and are recognized as suitable as structural materials, and are widely used in various buildings, bridges, harbors, marine structures, and underground structures.

In addition, recently, the use of high-strength and high-performance concrete is increasing due to the fact that building structures are becoming ultra-high and large in size, and high-performance concrete has a problem that is vulnerable to the explosion phenomenon that occurs during a fire. The high-performance concrete is manufactured to exhibit great compressive strength and good durability, and the internal structure of the concrete structure is densely constructed to satisfy this performance. Therefore, if the sudden high temperature phenomenon occurs in the concrete structure, the internal water vapor pressure is generated, and the internal water vapor pressure generated inside the concrete structure exceeds the tensile strength of the concrete, causing severe explosion and peeling and dropping from the concrete structure. Is generated. In a building using high-performance concrete, a sudden high heat in case of fire causes the surface of the member to be peeled off and dropped along with severe binge drinking. Even collapse.

Such bursting is more intense with low water-cement ratio and higher density concrete with high internal structure.

As mentioned above, various techniques for improving the fire resistance indicating resistance to explosion phenomenon, which is a problem in high-performance concrete, have been proposed. In Korean Patent Laid-Open Publication No. 2003-47069, US Patent No. 5749961, etc. Disclosed is the incorporation of organic fibers in concrete production.

However, in the above technology, the organic fiber is mixed into the concrete composition, thereby preventing the thermal expansion of the concrete. However, when the organic fiber is mixed, it is not dispersed properly, resulting in poor construction properties and durability due to aggregation among the organic fibers. There is.

In other words, attempts to improve the mechanical properties (strength) of high-performance concrete have had a detrimental effect on fire resistance. On the contrary, attempts to improve the fire resistance of concrete have been found to reduce workability such as mechanical properties (strength) or flowability of concrete. There was a problem.

An object of the present invention is to provide a composition which can improve the fire resistance while maintaining the high strength and workability of concrete and the concrete produced thereby.

The present invention as a means for achieving the above object,

For the concrete unit volume, 900 to 1200kg / ㎥ and the binder containing cement; For the concrete unit volume, water 140 to 170 kg / m 3; With respect to the concrete unit volume, fine aggregate 400 to 800 kg / ㎥; For the concrete unit volume, coarse aggregate 600 to 1200 kg / ㎥; The fiber reinforcing material is composed of 0.1 to 5.0 kg / m 3 with respect to the concrete unit volume, wherein the fiber reinforcing material is characterized in that the coating liquid containing an ester lubricant, a nonionic surfactant and an antistatic agent is coated on the fiber surface. It provides a high strength refractory concrete composition.

Ultra high-strength concrete has a more compact structure than ordinary concrete, that is, it is not easy to let out the water vapor pressure generated because the concrete content is increased and the moisture content is smaller and the pore inside is smaller. The present invention is to provide a composition comprising a fiber reinforcement coated with a dispersing accelerator to enhance fire resistance, which is resistant to explosion while maintaining workability and high strength.

In the present invention, the binder including cement includes 900 to 1200 kg / m 3 with respect to the concrete unit volume. The binder is preferably included 900kg / ㎥ or more in terms of strength, and preferably less than 1200kg / ㎥ in terms of preventing the increase in water vapor pressure due to economical efficiency, deterioration and lack of internal voids.

More preferably, the cement-containing binder is cement, and a mixture of one or more of 1,2,4 kinds of Portland cement of KS L 5201 standard and one or more mineral admixtures other than blast furnace slag powder, fly ash and silica fume as a binder. Can be configured in addition.

The composition ratio of the binder comprising cement is 45 to 80% by weight of one or more mixtures of 1,2,4 types of Portland cement, 10 to 45% by weight of blast furnace slag powder, 3 to 25% by weight of fly ash, and silica fume 3 It is reasonable that the sum of each composition of from 15% by weight to 4% by weight of the swelling agent constitutes 100% by weight.

The blast furnace slag fine powder mentioned above may be pulverized by granulating the sinter discharged from the blast furnace by granulation. Further, the blast furnace slag fine powder has a density of 2.8 g / cm 3 or more and a specific surface area of 4,000 to 10,000 g / cm 3, preferably 4,000 to 8,000 g / cm 3, in accordance with KS F 2563 standard.

The above-mentioned blast furnace slag powder is not hydrophobic in itself, but has a characteristic of hydrating slowly by stimulating alkalinity in cement, improving workability and long-term strength of concrete, and dense structure to improve water tightness and chemical resistance.

Fly ash may use pulverized coal ash collected by cooling and solidifying the non-combustible portion floating in a molten state when burning coal dust in a thermal power plant or the like. The fly ash may have a density of 1.95 g / cm 3 or more and a specific surface area of 30,000 g / cm 3 or more in accordance with the KS L 5405 standard. In addition, fly ash is a spherical particle with a smooth surface, which acts as a ball bearing to improve concrete workability, ie fluidity, and to slowly combine with calcium hydroxide dissolved in water at room temperature to form an insoluble compound to reduce heat of hydration, long-term strength and Watertightness can be increased.

The content ratio of the blast furnace slag powder and fly ash may be used in a weight ratio of 1: 1 to 5: 1, preferably 1: 1 to 2: 1.

       The expansion agent, 3CaO · 3Al₂O₃ · CaSO₄, produces fine acicular estrinzite crystals by reaction with CaSO₄ and Ca (OH) ₂ during curing of concrete to minimize dry shrinkage and self-shrinkage by volume expansion. Can be.

Water in the composition of the present invention comprises 140 to 170kg / ㎥ with respect to the concrete unit volume, the content of water is to be selectively adjusted to the optimum range in terms of strength and fluidity.

Aggregate in the present invention may be generally used for concrete, may be composed of fine aggregate and coarse aggregate. As the fine aggregate, particles having a particle size of 0.15 to 5.0 mm, an absolute dry density of 2.5 g / cm 3 or more, an absorption rate of 3% or less, and a stability of 10% or less can be used.

As the coarse aggregate, those having a particle diameter of 2.5 to 25 mm, an absolute condition density of 2.5 g / cm 3 or more, an absorption rate of 3% or less, a stability of 10% or less, and a wear rate of 40% or less can be used as the coarse aggregate.

In the present invention, the fine aggregate includes 400 to 800 kg / m 3 with respect to the concrete unit volume, and the fine aggregate is reasonable to be limited to the content range in terms of fluidity and material separation reduction. In addition, the coarse aggregate, it is preferable to include 600 to 1200kg / ㎥ with respect to the concrete unit volume in terms of fluidity and material separation reduction.

In particular, the present invention can be made by dispersing the surface-reinforced fiber reinforcement in the cement matrix while having a certain degree of workability (fluidity) and at the same time high strength and fire resistance.

In the present invention, the fiber reinforcing material may be configured in various ways, preferably polyamide.

The cross-sectional shape of the fiber reinforcement may be configured in various ways, in the present invention, the attachment end is further configured to the fiber reinforcement at both ends of the fiber reinforcement to enhance the adhesion to cement and the like. That is, as shown in Figure 6, the fiber reinforcing material 10 has a coating layer 11 is formed on the surface, both ends are attached to the end 12 is configured, the attachment end 12 is wider diameter toward each end It is configured to be so as to enhance the bonding force (adhesive force) with the concrete at both ends of the fiber reinforcement (10). The attachment end 12 is cut while vibrating at a slow speed when manufacturing the fiber reinforcement (10) to loosen the adhesion between the fibers constituting the fiber reinforcement (10) at both ends of the fiber reinforcement (10) At both ends of the fiber reinforcing material (10) is made of a shape in which the diameter is expanded by loosening the adhesion between the fibers. That is, by configuring the attachment end 12, cement is filled between the gaps generated by loosening of the adhesion between fibers in the attachment end 12, thereby increasing the bonding force between the fiber reinforcement 10 and concrete.

In addition, the fiber reinforcement has a uniform shape, the length of the fiber reinforcement is 1 to 100mm, preferably 3 to 40mm, the diameter or thickness of the cross section of the fiber reinforcement is 1 to 50㎛, preferably 10 to 40 [Mu] m. The length and diameter or the thickness of the fiber reinforcement can be adjusted to an appropriate range in consideration of the quality, durability, strength, etc. of the desired concrete, it is natural to use a uniform length and uniform diameter to maintain a uniform shape.

The uniform shape of the fiber reinforcement means that different fibers of any length or diameter are not mixed, and it is preferable to use a fiber reinforcement having a uniform shape of uniform length and uniform diameter in terms of dispersibility in concrete. Do. That is, the composition of the present invention should have good dispersibility in concrete because the fiber reinforcement has a uniform shape in order to have fire resistance and high strength and have proper construction properties.

In addition, the fiber reinforcing material is a strength measured by a gauge length of 5mm is 7.5g / d or more, preferably 9.5g / d or more, the elongation measured by a gauge length of 5mm 50% to 120%, preferably 70 to It can be 110%. If the strength and elongation of the fiber reinforcement is out of the above range will be disadvantageous in terms of crack resistance of the concrete.

In addition, the fiber reinforcement material may have a relative viscosity (RV) of 2.9 or more, preferably 3.2 or more, and if the relative viscosity (RV) of the fiber reinforcement material is lower than the above range, the strength and wear resistance of the fiber itself may be reduced. have.

In addition, the fiber reinforcing material in the present invention may be used having a fineness of 1 to 10 denier, preferably 1.5 to 5 denier. When the fineness is less than 1 denier, the fiber surface area is increased to increase the contact area with the concrete, but the strength of the fiber itself may be lowered and the dispersibility of the fiber in the concrete may be reduced. On the other hand, if the fineness exceeds 10 denier, the number of fibers per unit area of concrete decreases, which may cause a risk of forming a relatively weak part of the concrete.

In particular, the fiber reinforcement should be coated with a coating liquid containing an ester-based lubricant, a nonionic surfactant and an antistatic agent on the fiber surface, through this coating can be significantly improved dispersibility in concrete and bonding strength with concrete. That is, the fiber reinforcement coated with the coating liquid improves the dispersibility of the fiber reinforcement in the concrete and improves the bonding strength with the concrete, thereby preventing the strength of the concrete from being lowered by the addition of the fiber reinforcement. It is possible to prevent the deterioration of the workability, etc., and in particular, the fiber reinforcement is evenly distributed in the concrete to reduce the vapor pressure as a whole without bias in the concrete, so the effect is increased in terms of fire resistance. .

In consideration of the effect of improving the dispersibility and bonding strength of the fiber reinforcing material, the coating amount of the coating solution is preferably 0.5 to 3% by weight based on the total weight of the fiber reinforcing material. However, in the present invention, the coating amount of the coating solution is not particularly limited, and as a preferable example, the coating solution is 40 to 50% by weight of a polyhydric alcohol ester lubricant, 30 to 40% by weight of a nonionic surfactant, and 10 to 10 antistatic agents. What consists of 30 weight% can be used.

As described above, a technique for increasing dispersibility and bonding strength by using a fiber reinforcement coated with a coating liquid containing an ester lubricant, a nonionic surfactant, and an antistatic agent is disclosed in Patent Application No. 2008-79583 filed by the present applicant. Since an experimental example is provided, the description is abbreviate | omitted.

The fiber reinforcing material preferably comprises 0.1 to 5.0kg / ㎥ relative to the concrete unit volume. If the content of the fiber reinforcing material is less than 0.1kg / ㎥ relative to the concrete unit volume, it is disadvantageous in terms of fire resistance, which is a characteristic of the present invention, and also in terms of crack control. In addition, when the fiber reinforcing material exceeds 5.0kg / ㎥ is disadvantageous in terms of ultra high strength (more than 120Mpa) of the characteristics of the present invention and the mixing of the fiber reinforcement is not uniform uniform dispersion in the concrete due to the poor workability It is also disadvantageous in terms of crack control.

In the composition of the present invention, various admixtures may be used, for example, by mixing one or more admixtures comprising AE agents, water reducing agents, AE water reducing agents, and high performance water reducing agents, which are known as chemical admixtures for concrete according to KS F 2560. Can be used.

AE is generally a substance that adsorbs on the interface of two or more phases or other substances to change the interface properties significantly.The basic molecular structure is two identical structures, hydrophobic groups that are not soluble in water and soluble in water. It is composed of hydrophilic groups and is classified into anionic, cationic, and nonionic based on the electrical properties of hydrophilic ions in aqueous solution. The anionic AE agent comprises most of the commercially available AE agents, and the main chemical components are resinate, sulfate ester, and sulfonate type. The cationic AE agent has a cation with a hydrophilic group and is not used as an AE agent. In addition, nonionic AEs do not dissociate into ions in water, but ethers and esters are used as the molecules themselves have an interfacial activity.

The reducing agent and the AE reducing agent are admixtures that can reduce the unit amount by dispersing cement particles in concrete, or improve workability while entraining fine bubbles in the concrete, while reducing the unit amount by the dispersing effect. Reducing agents and AE reducing agents are classified into standard type, delay type and accelerated type according to the condensation and initial curing rate of concrete, respectively.Lignin sulfonate, alkylarylsulfonic acid, polyoxyethylene and alkylaryl ether System, oxycarboxylic acid system, melamine sulfonic acid system, and polycarboxylic acid system can be used.

High-performance susceptors are admixtures that can significantly reduce the amount of unit by using a high addition rate without adversely affecting the coagulation delay, excessive air entrainment, lowering strength by effectively dispersing the cement particles by further improving the function of the general susceptor.

Fire-resistant high-strength concrete composition of the present invention and the concrete produced thereby has the effect that can provide a concrete having fire resistance and at the same time have a very high strength of 120MPa or more.

Hereinafter, the configuration and operation of the present invention will be described in more detail with reference to the accompanying drawings. In describing the present invention, the term or word used in the present specification and claims is based on the principle that the inventor can appropriately define the concept of the term in order to best describe the invention of his or her own. It should be interpreted as meanings and concepts corresponding to the technical idea of

Examples and Experimental Examples

The materials used in Examples and Experimental Examples are as shown in Table 1 below.

TABLE 1

Fiber reinforcement materials and design reference strengths as materials used in Examples and Experimental Examples are shown in Table 2 below.

Polyamide was used as the fiber reinforcing material, and polypropylene was used as the fiber reinforcing material as a comparative example. Each fiber reinforcing material was coated with a dispersant.

TABLE 2

Experimental items in this Example and Experimental Example are as shown in Table 3 below.

[Table 3]

The specimen preparation and curing method in the present embodiment and the experimental example are as follows.

ㆍ Specimen Fabrication: Using Table Vibrator

ㆍ Curing method: Compressive strength specimen-Standard curing, test specimen for thermal explosion-Atmospheric curing

In the present Examples and Experimental Examples, the amount of the compounding material is as shown in Table 4 below.

[Table 4]

W / B: water-binding ratio, S / a: fine aggregate ratio, W: water, S: fine aggregate, G: coarse aggregate

Ad: Admixture, F: Fiber Reinforcement

Experimental results of this embodiment and experimental examples are as follows.

-. Unconsolidated Concrete Properties

As shown in Table 5, the characteristics of the concrete that is not hardened by fiber reinforcement content, fiber reinforcement length, and fiber reinforcement type. The target quality was set to 700 mm 100mm of slump flow and 3.5% or less of air volume.

TABLE 5

Plain in Table 5 shows a comparative example as a specimen without the fiber reinforcing material, PA shows an embodiment using polyamide as the fiber reinforcing material, PP shows a comparative example using polypropylene as the fiber reinforcing material will be. In the present experimental example, nine specimens are presented as examples and comparative examples of the present invention. In each of the examples, PA 6-1.5 is a fiber reinforcement made of polyamide, having a length of 6 mm, and a mixing amount of 1.5 per unit volume of concrete. Kg / m 3 represents the mixed specimen, AP 6-2.0 is a fiber stiffener made of polyamide, 6 mm in length, and the mixing amount represents a specimen mixed with 2.0 kg / m 3 relative to the concrete unit volume, AP 6-2.5 is Fiber reinforcement made of polyamide, 6mm in length and 2.5 kg / m3 of mixing amount per unit volume of concrete are shown. AP 13-1.5 is fiber reinforcement made of polyamide, 13mm in length, and mixing amount is in unit volume of concrete. It indicates the specimen mixed with 1.5kg / ㎥ with respect to, AP 13-2.0 is a fiber reinforcement of polyamide 13mm in length, the amount of mixing 2.0 to the concrete unit volume Kg / m 3 represents the mixed specimen, AP 13-2.5 is a fiber stiffener made of polyamide and 6mm in length, and the amount of the mixture is 2.5 kg / m 3 mixed with the concrete unit volume, PP 13-1.5 Fiber reinforcement made of polypropylene, 13mm in length and 1.5 kg / m3 of mixing amount per unit volume of concrete are shown. PP 13-2.0 is fiber reinforcement made of polypropylene, 13mm in length, and mixing amount is made of concrete unit volume. It indicates the specimen mixed with 2.0kg / ㎥ with respect to, PP 13-2.5 is a fiber reinforcement of polypropylene 13mm in length, and the specimen mixed with 2.5kg / ㎥ in the concrete unit volume.

As shown in Figure 1, it can be seen that the slump flow decreases as the fiber reinforcement is incorporated, which is disadvantageous when the fiber reinforcement is mixed with the comparative example (Plain) in terms of fluidity, but PP 13-2.0 Except for PP 13-2.5, the target slump flow, 700 wh 100mm, is satisfied. That is, in terms of fluidity, polyamide has an optimum length of 13 mm or less and a mixing amount of 1.5 to 2.5 kg / m 3 or less, and polyamide is more advantageous in terms of fluidity than polypropylene. .

Filling properties (difference of 25 mm or less between slump flow and J-Ring) are also good except for PP 13-2.0 and PP 13-2.5. It can be seen that the same as, it is seen that the case of polyamide than polypropylene is advantageous.

-. Hard concrete properties

(1) strength characteristics

Table 6 below shows the strength characteristics of each of Comparative Examples and Examples.

TABLE 6

As shown in Table 6 and FIG. 2, it can be seen that the target age is 56 days except for PA 13-2.5 and PP 13-2.5, and satisfies all of the design reference strengths of 160 MPa. It can be seen that the mixing amount of 13 mm or less and the mixing amount of 1.5 or more and 2.0 kg / m 3 or less is the optimum compounding amount, and the polyamide is more advantageous in terms of strength than in the case of polypropylene.

(2) fire resistance

Regarding fire resistance, the test organization is led by the Korea Disaster Prevention Testing Institute (Gamnam-myeon, Yeoju-gun, Gyeonggi-do), and the test conditions are based on KS F 2257-1 standard time-heating temperature curve and 3 hours of no load.

Test Body Fabrication

 ㆍ Mass Reduction Rate, Width × Force Rating: Φ 100 ㅧ 200 mm

 ㆍ Rebar temperature: 150 × 150 × 225 mm, rebar cover 40 mm

Experimental results under the same conditions as shown in Table 7 below.

TABLE 7

Note) Explosion Class Classification

. Level 1: Non-explosion or less than 1/4 dropping or peeling

. Level 2: Dropping or peeling off more than 1/4 of specimen and less than 1/2

. Level 3: Dropping or peeling off more than 1/2 of specimens and less than 3/4

. Level 4: Dropping or peeling off more than 3/4 of the specimens

As shown in the above table, the mass reduction rate is rather large as 20 to 23% in the whole specimen in which fiber reinforcement is incorporated, which is considered to be due to the effect of dolomite decomposition (decarbonation) at 600 to 900 ° C. as a result of using dolomite as a coarse aggregate.

As shown in FIG. 3, the bursting phenomenon occurs most severely in the specimens in which the fiber reinforcement material is not mixed, and also occurs slightly in PA 6-1.5 and PA 6-2.0. It can be seen that as the increase, the explosion phenomenon becomes smaller.

In the case of rebar temperature, Table 8 shows the temperature increase for 180 minutes at 11, 12, 13, and 14 in the test body (polyamide is incorporated) shown in FIG. 4, and FIG. 5 shows a graph of the result. . As shown in Table 8 and FIG. 5, it can be seen that the reference value (649 ° C.) was not reached in 180 minutes in the case of the specimen in which the polyamide was incorporated. On the other hand, although not shown in the drawing, the time to reach the reference value (649 ° C) was 57 minutes for the test specimen in which the fiber reinforcement was not mixed in the same standard. 649 ° C.), it can be seen that the arrival time is long.

[Table 8]

In conclusion, in the case of unconsolidated concrete, it is somewhat lowered by the mixing of fiber reinforcement in terms of fluidity and filling, but in the case of polyamide, the target slump flow is satisfied by satisfying the target slump flow in the length of 19mm or less and the mixing amount of 1.5 or more and 3.0㎏ / ㎥ or less. It can be seen that it is determined to be a compounding amount.

On the other hand, in the hard concrete, the strength is somewhat lowered due to the incorporation of fiber reinforcement, but in the case of polyamide, when the length is less than 19mm and the mixing amount is 1.5 to 3.0kg / ㎥, the optimum compounding capacity is satisfied because the design standard strength is 160MPa. It is judged to be.

In addition, it can be seen that the explosion phenomenon disappears and the rise time of the rebar temperature increases with the increase in the length and the amount of fiber reinforcement at the explosion phenomenon and rebar temperature.

After all, as the amount of fiber reinforcement is increased, the fire resistance is strengthened. However, in terms of workability and strength, such as fluidity, the fire resistance is reduced. In order to satisfy all the above conditions, the length of nylon is less than 19mm, and the mixing amount is 1.5 or more and 3.0㎏ / ㎥ or less. It is judged to be.

1 is a graph showing the fluidity test results according to an example of the present invention.

2 is a graph showing the test results of compressive strength according to an embodiment of the present invention.

3 is an experimental result showing an exploded shape according to an embodiment of the present invention.

4 is an experimental result showing the explosion shape of the specimen for measuring the rebar temperature according to an embodiment of the present invention.

5 is a graph showing a test result of rebar temperature in accordance with an example of the present invention.

Figure 6 is a SEM photograph showing the shape of the fiber reinforcing material of one configuration of the present invention.

Claims (11)

For the concrete unit volume, the binder containing cement 900 to 1200kg / ㎥; For the concrete unit volume, water 140 to 170 kg / m 3; With respect to the concrete unit volume, fine aggregate 400 to 800 kg / ㎥; For the concrete unit volume, coarse aggregate 600 to 1200 kg / ㎥; The fiber reinforcing material is composed of 0.1 to 5.0 kg / m 3 with respect to the unit volume of concrete. High strength refractory concrete composition. The method of claim 1, The coating amount of the coating solution is high strength refractory concrete composition, characterized in that 0.5 to 3% by weight relative to the total weight of the fiber reinforcement. 3. The method of claim 2, The coating solution is a high-strength refractory concrete composition, characterized in that consisting of 40 to 50% by weight of polyhydric alcohol ester lubricant, 30 to 40% by weight of nonionic surfactant, and 10 to 30% by weight of antistatic agent. The method of claim 1, The fiber reinforcement is a high strength refractory concrete composition, characterized in that composed of polyamide. The method of claim 4, wherein The fiber reinforcement is 1.5 to 5.0kg / ㎥ or less with respect to the concrete unit volume, the high-strength refractory concrete composition, characterized in that the length does not exceed 19mm. The method of claim 1, The fiber reinforcement is a high strength refractory concrete composition, characterized in that the end is further configured with an expanded diameter on both ends. The method of claim 1, The fiber reinforcement has a single shape, high strength refractory concrete composition, characterized in that it has a single diameter of 1 to 50㎛. The method of claim 1, The fiber reinforcement material is a high strength refractory concrete composition, characterized in that the fineness of 1 to 10 denier. The method of claim 1, The binder containing the cement, 45 to 80% by weight of one or more mixtures of 1,2,4 types of Portland cement, 10 to 45% by weight of blast furnace slag, 3 to 25% by weight of fly ash, 3 to 15% by weight of silica fume, 4 to 4 expansion agents High strength refractory concrete composition, characterized in that the multi-component cement of 7% by weight.        The method of manufacturing a high strength premix cement, wherein the multicomponent cement of claim 9 is mixed in a gravity-free mixer or a mixer in which a mixer body and a stirring blade are rotated in reverse for a mixing time of 2 to 10 minutes. A high strength refractory concrete composition formed by the composition of any one of claims 1 to 9, having a slump flow of 600 to 800 mm and a compressive strength of at least 120 MPa.

Images