KR101922806B1 - Refractory panel structure for preventing explosion of high strength concrete and manufacturing method thereof - Google Patents

Abstract

The present invention provides a refractory panel structure for preventing explosion of high strength concrete, wherein a refractory panel is placed on one surface of a high strength concrete member, and the refractory panel has cement, blast furnace slag, organic fiber, and steel fiber, and provides a manufacturing method thereof. According to the present invention, the refractory panel structure for preventing explosion of high strength concrete has high fire resistance and high durability to be applied to a skyscraper and a large size structure.

Description

TECHNICAL FIELD [0001] The present invention relates to a fireproof panel structure for preventing high-strength concrete explosion, and a manufacturing method thereof. BACKGROUND OF THE INVENTION [0002]

The present invention relates to a refractory panel structure for preventing high-strength concrete explosion with high fire resistance and high durability and a method for manufacturing the same.

High-strength concrete can reduce the weight of buildings and reduce the cross-section of buildings. Recently, the application of high - strength concrete has been increasing as the construction of super high - rise buildings and large structures has progressed actively in Korea.

However, high-strength concrete uses an admixture to increase the strength of the concrete. As a result, the internal structure becomes dense and the amount of internal porosity decreases. As a result, the heat transfer occurs rapidly and the surface of the member abruptly suddenly becomes high at a certain high temperature due to water vapor generated in the concrete. Causing a spalling phenomenon in which peeling and detachment occur together with blowing.

This sudden explosion is a threat to the safety of the structure due to the scattering of the fragments of the reinforced concrete member and the deterioration of the members due to the exposure of the reinforcing bars. In case of a fire in high-rise buildings and large structures, If the collapse of the building is caused, it is expected that the impact on the society and the environment will be extreme due to the huge human and property damage.

Conventionally, refractory materials have been developed to prevent such problems, but conventional refractory materials are vulnerable to impact, vulnerable to fire, and expensive.

As described above, in order to overcome the problems of the prior art, it is necessary to study the cause of the explosion problem of the high-strength concrete and to study the factors affecting the explosion, do.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fire-resistant panel structure for preventing high-strength concrete explosion-preventing high-fire and high-durability concrete applicable to high-rise buildings and large structures.

It is still another object of the present invention to provide a method for manufacturing a refractory panel for preventing the concrete explosion.

The present invention provides a refractory panel structure for preventing high-strength concrete explosion prevention comprising a high-strength concrete member and a refractory panel positioned on one side of the high strength concrete member, wherein the refractory panel includes cement, fine slag powder, organic fiber and steel fiber do.

The blast furnace slag fine powder may be contained in an amount of 15 to 25 parts by weight based on 100 parts by weight of the cement, and the organic fibers and the steel fiber may be included in 0.05 to 0.5 parts by weight of the cement and blast furnace slag fine powder per 100 parts of the skin.

The blast furnace slag fine powder may have a particle diameter of 8 to 14 탆, a specific gravity of 2.8 to 3.0, and a powdery degree of 3,800 to 4,200 ㎠ / g.

The organic fibers may be any one selected from the group consisting of polyvinyl alcohol fibers, micro polypropylene fibers, and combinations thereof.

Any one selected from the group consisting of the organic fiber, the steel fiber, and both of them may be a hollow fiber.

The present invention also relates to a method for manufacturing a cement mortar composition, comprising the steps of: a dry beaming step of mixing and mixing a cement and a blast furnace slag fine powder, a water mixing step of mixing water with the dry beaten cement and blast furnace slag fine powder mixture, A step of preparing a panel by discharging and hardening the mixture of the cement, the blast furnace slag, the organic fiber and the steel fiber mixture to form a panel, and a step of positioning the panel on one side of the high strength concrete member The present invention also provides a method of manufacturing a refractory panel structure for preventing high-strength concrete explosion.

The present invention can provide a high-strength fire-resistant panel structure for preventing high-strength concrete explosion with high fire resistance and high durability applicable to a high-rise building and a large structure.

The present invention can also provide a method for manufacturing a refractory panel structure for preventing high-strength concrete explosion which is excellent in high-seismicity and crack control ability.

1 is a view showing a crack pattern when concrete is exposed to high temperature.
FIG. 2 is a view showing the explosion mechanism when the concrete is exposed to high temperature. FIG.
3 is a view showing a crack pattern and an explosion mechanism when concrete is exposed to high temperatures.
4 is a photograph showing a manufacturing process of a refractory panel for high-strength concrete according to an embodiment of the present invention.
5 is a photograph showing a manufacturing process of a high-strength concrete member according to an embodiment of the present invention.
6 is a photograph showing a process of manufacturing a refractory panel structure for preventing high-strength concrete explosion by combining a refractory panel and a high-strength concrete member according to an embodiment of the present invention.
7 is a view for explaining the concept of classification according to the explosion occurrence according to Experimental Example 4 of the present invention.
8 is a view for explaining the concept of classification according to the explosion occurrence according to Experimental Example 4 of the present invention.
9 is a photograph showing the results of the external appearance test of the refractory panel according to the comparative example and the embodiment of the present invention.

Hereinafter, the present invention will be described in more detail.

The refractory panel structure according to an embodiment of the present invention includes a high strength concrete member and a refractory panel positioned on one side of the high strength concrete member, and the refractory panel includes cement, blast furnace slag fine powder, organic fiber and steel fiber.

The cement binds the aggregates and enhances the strength of the refractory panel structure. The cement may use Portland cement specified in KS.

When the content of the cement is high, it is effective in improving the strength. However, as the density and the thermal conductivity are increased and the heat is applied, water contained in the pores is changed into water vapor and the pressure is increased to cause explosion. Lt; / RTI > On the other hand, when the content of cement is small, the strength is lowered and the durability is decreased, so that the mechanical function as a refractory panel may not be exhibited.

The refractory panel structure for preventing high-strength concrete explosion according to an embodiment of the present invention includes blast furnace slag fine powder.

Generally, concrete is resistant to compression, but has relatively low tensile strength and insufficient crack resistance in comparison with compressive strength. Therefore, there has been a problem of shortening the life of concrete caused by cracks and corrosion of steel bars. When the blast furnace slag is contained as a concrete material, the above problem can be solved because it contributes to an increase in durability.

Blast furnace slag is a by-product of the steel industry. Its components are mainly composed of silicon dioxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and calcium oxide (CaO), mainly Portland cement (OPC). (MnO), iron oxide (FeO), sulfur (S), alkali (Na ₂ O, K ₂ O), and the like.

The blast furnace slag fine powder may be contained in an amount of 15 to 25 parts by weight based on 100 parts by weight of the cement. If the blast furnace slag fine powder is contained in an amount of less than 15 parts by weight, the durability increase effect may be insufficient. If the blast furnace slag finer powder exceeds 25 parts by weight, the water permeability of the refractory panel structure may be deteriorated.

The blast furnace slag fine powder may have a particle diameter of 8 to 14 mu m, a specific gravity of 2.8 to 3.0, and a powder degree of 3,800 to 4,200 cm < 2 > / g. The refractory panel structure for preventing high-strength concrete explosion can increase the adiabatic temperature by including micro-sized blast furnace slag within the above range.

However, since the initial strength of concrete using blast furnace slag powder is generally low, the performance such as strength, permeability and other properties of the concrete changes depending on the casting temperature, curing condition and curing temperature of the concrete, and various problems such as neutralization and drying shrinkage .

In addition, most of the fibers used in the conventional fiber-reinforced concrete use a new material, which increases the manufacturing cost of the fiber-reinforced concrete, so that it is very limited when the fiber-reinforced concrete requires economical efficiency.

The refractory panel structure for preventing high-strength concrete explosion prevention according to an embodiment of the present invention can solve the above problems by using the blast furnace slag fine powder, the organic fiber and the steel fiber, and improve the fire resistance and durability of the refractory panel structure.

Specifically, the organic fibers may be any one selected from the group consisting of polyvinyl alcohol fibers, micropolypropylene fibers, and combinations thereof.

Poly (vinyl alcohol) (PVA) fiber has excellent thermal properties, strength and chemical resistance, and is suitable for fireproof panel structures to prevent high-strength concrete explosion. Specifically, the polyvinyl alcohol fiber may have a diameter of 1 to 20 mu m, a length of 10 to 20 mm, a specific gravity of 0.5 to 1.5, and a tensile strength of 2,600 to 2,800 MPa. If the length of the polyvinyl alcohol fiber is less than 10 mm, the contact area between the refractory panel and the fiber is narrowed, and the improvement effect of the tensile strength and the compressive strength of the refractory panel structure may be deteriorated. The dispersibility of the fibers may deteriorate and the physical properties may be lowered. If the diameter is less than 1 탆, the surface area of the fiber increases to increase the contact area between the fiber and the refractory panel. However, the strength of the fiber itself may decrease and the dispersibility of the fiber in the refractory panel may deteriorate. If it is more than 20 占 퐉, it is preferable to use fibers having the above-mentioned diameters and lengths because the surface area of the fibers is reduced and the contact area is reduced and the strength may be lowered.

Polyproplene (PP) fiber is characterized by having a high water absorbing ability, including numerous micro voids produced by the microfiber of microfine fibers after the diameter of the polypropylene fiber is used. Specifically, the micropolypropylene fiber may have a diameter of 30 to 60 탆, a length of 50 to 100 탆, a specific gravity of 0.5 to 1.5, and a tensile strength of 2,600 to 2,800 MPa.

The refractory panel according to the present invention may include the polyvinyl alcohol fiber and the micropolypropylene fiber as organic fibers, respectively, but polyvinyl alcohol fibers and micropolypropylene fibers having different diameters and different lengths may be mixed.

The steel fiber (SF) is suitable for a refractory panel which has high strength and flexibility and becomes a material of high strength concrete. Specifically, it may have a diameter of 1 to 20 mu m, a length of 10 to 20 mm, a specific gravity of 0.5 to 1.5, and a tensile strength of 3,600 to 3,800 MPa.

The organic fiber and the steel fiber may be contained in 0.05 to 0.5 part skin to 100 parts of the skin of the cement and the blast furnace slag, and the organic fiber and the steel fiber may be contained in an amount of 0.10 to 0.5 part It is more preferable to be included as skin. If the organic fiber and the steel fiber are contained in an amount of less than 0.05 part skin, the reinforcing effect through fiber inclusion is insignificant, and heat may be generated. If the organic fiber and steel fiber are more than 0.5 part skin, the dispersibility may be lowered and the strength of the refractory panel structure may be problematic.

The refractory panel structure for preventing the explosion of high strength concrete according to the present invention can improve not only the refractory performance but also the durability of the structure including the organic fiber and the steel fiber.

The mixing ratio of the organic fibers to the steel fibers is preferably 1: 1 to 1: 2 by volume. If the steel fiber contains less than 1 part by volume of the organic fiber, the strength may be lowered. If the weight of the steel fiber exceeds 2 parts by volume, the porosity may be lowered and the refractory effect may be insignificant.

In the refractory panel structure for preventing high-strength concrete explosion, any one selected from the group consisting of organic fibers, steel fibers, and both may be hollow fibers.

Hollow fiber refers to a hollow fiber, specifically a macaroni-shaped fiber in which the central portion of the fiber is continuous or discontinuous in the longitudinal direction and hollow like a tunnel. Natural hollow fibers can be used, but man-made fibers can be used which are improved in polymer or produced in hollow form in the spinning stage. The hollow fiber is lightweight and easily melts when heated. In detail, the hollow fiber may have a porosity of 30 to 70% by volume and melt at 300 ° C or less.

1 is a view showing a crack pattern when concrete is exposed to high temperature. The crack pattern when the concrete member is exposed to high temperature by fire or the like can be explained with reference to FIG. The crack pattern may include a drying shrinkage crack 101, a horizontal crack 102, a tangential crack 103, a radial crack 104, and a crack in the constituent material 105, depending on the temperature change.

FIG. 2 is a view showing the explosion mechanism when the concrete is exposed to high temperature. FIG. The explosion mechanism when the concrete member is exposed to high temperature by fire or the like can be explained with reference to FIG. The main cause of the explosion phenomenon is known to be a result of the combined action with the crack 202 due to the thermal stress in addition to the rise of the water vapor pressure 201.

The cracking and explosion mechanism according to FIGS. 1 and 2 will now be described in more detail. 3 is a view showing a crack pattern and an explosion mechanism when concrete is exposed to high temperatures. When the concrete member is exposed to high temperature by fire or the like, first, heat penetration and water vapor migration (S301) occur. The moisture in the layer adjacent to the exposed surface moves to the relatively low temperature interior and is reabsorbed into the pores of the adjacent layer. However, in the case of conventional high-strength concrete, the internal structure is dense due to the admixture added to increase the strength, and accumulation of water vapor occurs (S302). Moisture clog is formed due to accumulation of water vapor to increase water vapor pressure (S303), and the thickness of the dry layer on the surface of the member increases, and a distinction is made between the dry layer and the saturated layer. As the fire progresses, water movement to the inside becomes difficult, and the pressure for moving the water vapor toward the exposed surface and the pressure for expanding the water vapor are larger than the tensile strength of the concrete, and the explosion phenomenon occurs (S304) .

The present invention can improve the strength of the refractory panel by using the blast furnace slag fine powder, the organic fiber and the steel fiber to replace the high strength concrete, and mix the blast furnace slag fine powder with the heat insulating functional microparticles, the organic fiber and the steel fiber, (201, S302) and cracks (202, S303) due to thermal stress can be prevented by using internal pores formed by melting of organic fiber and steel fiber as a passage of water when the temperature rises. have.

Meanwhile, the refractory panel structure for preventing high-strength concrete explosion may further include sand sand as a fine aggregate. Silica sand may be included to improve strength, reduce shrinkage, and improve economic efficiency. The sand sand may have a grain size of 112 to 188 탆 and a specific gravity of 2.5 to 2.7. According to the micro-mechanical analysis, the size of aggregate rather than the type of aggregate has a more decisive influence on the mechanical properties of fiber composite fireproof panel. In addition, it is generally known that it is advantageous to use a fine aggregate having a fine particle size. However, when the particle size is less than 112 탆, sandy sand within the above range is most preferable because it adversely affects workability. Also, the sand sand may be included in 80 to 90 parts by weight of sandy silica relative to 100 parts by weight of the cement.

The refractory panel structure for preventing high-strength concrete explosion may further include various additives such as additional admixtures, binders, and aggregates. Any of the various additives may be used as long as they are commonly used in the field to which the present invention belongs. The content of these additives is not particularly limited as long as it depends on the compounding ratio used in ordinary refractory panels.

The refractory panel structure for preventing high-strength concrete explosion prevention according to the present invention comprises a dry beam-beam step for mixing and mixing cement and blast furnace slag fine powder, a water mixing step for mixing water to the mixture of the dry bean-beamed cement and blast furnace slag, A step of mixing the organic fiber and the steel fiber into the cement and blast furnace slag fine powder mixture and mixing the mixture, mixing the organic fibers and the steel fiber with the cement blast furnace slag powder mixture, And placing the panel in a high strength concrete member.

The above-mentioned dry beaming step is a step of mixing the introduced cement and the blast furnace slag fine powder, and no water is introduced at this time. Therefore, it is easy to check the mixing state of the material by mixing the aggregate and the cement before the water is introduced. At this time, a rotary mixer is used, and mixing can be performed at a speed of 25 to 35 rpm to evenly mix the cement and blast furnace slag fine powder. Preferably, the mixing time is not limited to 1 minute and 30 seconds to 2 minutes. However, after mixing for a predetermined time, it is checked whether the materials are mixed, the rotation speed is maintained at 15 to 25 rpm, You may.

In the water mixing step and the fiber mixing step, water, organic fiber, and steel fiber are further mixed into the cement and blast furnace slag fine powder in a state where the drying step is completed. At this time, it is preferable that the rotational speed of the rotary mixer is maintained at 15 to 25 rpm. In addition, water may be added to the total amount, organic fibers and steel fibers may be partially mixed and partially mixed, and then the remaining organic fiber and steel fiber may be further mixed to be further mixed.

In the discharging and molding step, a mixture of the cement and the blast furnace slag powder into which the organic fibers and the steel fiber are further mixed is poured into the mold and hardened to manufacture a panel.

It is preferable that the discharged mixture is subjected to a flow test and then molded to prevent defective products.

The method may further include the step of installing a mesh after placing the mixture of the cement, the blast furnace slag fine powder, the organic fiber and the steel fiber into the mold. The mesh may be of a wedge-shaped structure, a V-shaped bent structure, or a single layer or more.

4 is a photograph showing a manufacturing process of a refractory panel for high-strength concrete according to an embodiment of the present invention. 4, a refractory panel according to the present invention includes a mold making step S401, a dry beaning step S402, a water mixing step S403, a fiber incorporating step S404, a discharging step S405, The test step S406, the placing step S407, the mesh mounting step S408, and the hardening step S409.

The panel manufactured by the above method can be placed in a high-strength concrete member to manufacture a refractory panel structure for preventing high-strength concrete explosion.

5 is a photograph showing a manufacturing process of the high strength concrete member of the present invention. Referring to FIG. 5, the high-strength concrete member includes a mold making step S501, a rebar assembling step S502, a rebar laying step S503 for placing the assembled rebar in the formwork, A thermocouple setting step (S504) for installing a thermocouple for an experiment, and a high-strength concrete casting step (S305) for placing a high-strength concrete composition manufactured by a conventional method on the formwork.

6 is a photograph showing a process of manufacturing a refractory panel structure for preventing high-strength concrete explosion by combining the refractory panel and the high-strength concrete member. The joining process of the panel and the concrete member will be described with reference to FIG. The high-strength concrete member manufactured in the process of FIG. 5 is demolded in the formwork (S601), and a hole is formed in the high-strength concrete member (S602). The puncture site is cleaned (S603), and an anchor and a bolt are installed in the puncture site (S604 and S605). The panel manufactured in the process of FIG. 4 is placed on the high-strength concrete member (S606). The panel protruding portion is grinded and refined (S607), and a thermocouple for the experiment can be attached (S608). The refractory mortar composition may be installed in the joint between the high-strength concrete member and the panel to fill the gap (S609). The coupling bolts are assembled using the impact wrench (S610), and the thermocouple is extended (S6611) so that the thermocouple can be measured from the outside (S612). The refractory panel structure for high strength concrete according to the present invention can be manufactured through the above-described bonding process (S613).

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[Manufacturing Example: Fabrication of Refractory Panel Structure]

The mold was made. Cement and blast furnace slag fine powder were dried without water and then water and fiber were added to prepare a mortar composition. The mortar composition was discharged and the flow value was measured. It was confirmed that the flow rate of the mortar composition was normal and poured into the mold. In Comparative Examples 17 to 20 and Example 4, a mesh was additionally provided on the upper portion and hardened to prepare a refractory panel. The content of the cement, the blast furnace slag powder and the fiber is the same as the composition shown in Table 1 below.

The mold was made and the rebar was assembled. The assembled reinforcing bars were placed on the molds, and thermocouples for experiments were installed on the molds in which the reinforcing bars were arranged. The high strength concrete composition prepared by a conventional method was placed in the mold and hardened to prepare a high strength concrete member.

The refractory panel and the high-strength concrete member were demolded in a mold, holes for bonding were removed, and the perforated area was cleaned. An anchor and a bolt were installed in the perforated portion to place the refractory panel on the high-strength concrete member, and the panel projection was finished by grinding. A thermocouple was attached to test the heat resistance and a mortar composition was poured into the panel joint to fill the gap. A refractory panel structure was fabricated by assembling the coupling bolts using an impact wrench.

cement
(Parts by weight) Blast furnace slag
(Parts by weight) Fly ash
(Parts by weight) Organic fiber 1
(Minor skin) Organic fiber 2
(Minor skin) Steel fiber
(Minor skin) panel Comparative Example 1 100 20 - - - - No panel Comparative Example 2 100 20 - - - - panel Comparative Example 3 100 20 - - - - Comparative Example 4 100 - 20 - - - Comparative Example 5 100 20 - 0.05 Fiber reinforced panel Comparative Example 6 100 20 - 0.15 Comparative Example 7 100 20 - 0.25 Comparative Example 8 100 20 - 0.05 Comparative Example 9 100 20 - 0.15 Comparative Example 10 100 20 - 0.25 Comparative Example 11 100 20 - 0.05 Comparative Example 12 100 20 - 0.15 Comparative Example 13 100 20 - 0.25 Comparative Example 14 100 20 - 0.025 0.025 hybrid
Refractory panel Comparative Example 15 100 20 - 0.075 0.075 Comparative Example 16 100 20 - 0.125 0.125 Example 1 100 20 - 0.025 0.025 Example 2 100 20 - 0.075 0.075 Example 3 100 20 - 0.125 0.125 Comparative Example 17 100 20 - 0.25 Insert mesh
Refractory panel Comparative Example 18 100 20 - 0.15 Comparative Example 19 100 20 - 0.15 Comparative Example 20 100 20 - 0.075 0.075 Example 4 100 20 - 0.075 0.075

- Content of blast furnace slag and fly ash: Based on 100 parts by weight of cement, the blast furnace slag or the weight of fly ash

- Content of organic fibers and steel fibers: 100 parts of cement and blast furnace slag

- Blast furnace slag: Blast furnace slag fine powder having a particle diameter of 11 탆

- Fly ash: Fly ash fine powder having a particle size of 11 탆

- Organic fiber 1: Polyvinyl alcohol fiber (PVA)

- Organic fiber 2: Micropolypropylene fiber (PP)

- Steel fiber

[ Experimental Example  1: Mortar Specimen  Strength Remaining Characteristics Test]

In order to test the residual strength characteristics of the mortar specimens prepared in the above Examples and Comparative Examples, a standard fire temperature test was conducted for each of the non-fires, 300 ° C., 600 ° C. and 900 ° C., Were tested for compressive strength. Strength (MPa) was measured and the compressive strength retention ratio is shown in Table 2 below.

division Non-fire 300 ° C 600 ℃ 900 ℃ MPa MPa Remaining rate MPa Remaining rate MPa Remaining rate Comparative Example 1 - - - - - - - Comparative Example 2 20.7 16.5 79.7% 18.7 90.3% Explosion Explosion Comparative Example 3 27.7 28.6 103.2% 25.4 122.7% Explosion Explosion Comparative Example 4 25.8 20.3 78.7% Explosion Explosion Explosion Explosion Comparative Example 5 23.7 20.4 86.1% 23.6 114.0% Explosion Explosion Comparative Example 6 27.4 25.3 92.3% 19.3 93.2% 16.9 81.6% Comparative Example 7 28.9 28.9 100.0% 26.5 128.0% 18.2 87.9% Comparative Example 8 23.4 27 115.4% Explosion Explosion Explosion Explosion Comparative Example 9 23.4 25.5 109.0% 22.9 110.6% 16.3 78.7% Comparative Example 10 27.1 24.7 91.1% 21 101.4% 11.3 54.6% Comparative Example 11 23.8 24 100.8% 28.6 138.2% Explosion Explosion Comparative Example 12 27.4 17.6 64.2% Explosion Explosion Explosion Explosion Comparative Example 13 25.7 22.2 86.4% 27.1 130.9% Explosion Explosion Comparative Example 14 25.3 27.4 108.3% Explosion Explosion Explosion Explosion Comparative Example 15 28.6 26.7 93.4% 25.8 124.6% 21.2 102.4% Comparative Example 16 24.5 21 85.7% 24.1 116.4% 17.5 84.5% Example 1 25.5 25.8 101.2% Explosion Explosion Explosion Explosion Example 2 25.8 25.7 99.6% 25.1 121.3% 17.4 84.1% Example 3 24.9 27.3 109.6% 26.3 127.1% 16.4 79.2%

Referring to Table 2, it was confirmed that the compression strength retention ratios of Examples 2 and 3 were superior to those of Comparative Examples. In Example 1, the content of fibers is too small as compared with cement, and the effect of refractory and lubrication is expected to be insignificant.

[ Experimental Example  2: Weight change experiment]

In order to carry out the weight change experiments of the mortar specimens prepared in the above-mentioned Examples and Comparative Examples, the standard fire temperature heating test was carried out for the non-fires, 300 ° C., 600 ° C. and 900 ° C., Table 3 shows the weight of all the test pieces and the weight change of the test pieces after the completion of the heating test.

division 300 ° C 600 ℃ 900 ℃ Remarks I'm after Decrease (%) I'm after Decrease (%) I'm after Decrease (%) Comparative Example 1 - - - - - - - - - - Comparative Example 2 3050 2869 6% 3048 2524 17% 3063 Measure
Impossible - Explosion Comparative Example 3 3160 2998 5% 3140 2627 16% 3173 Measure
Impossible - Explosion Comparative Example 4 3150 2908 8% 3125 2577 18% 3169 Measure
Impossible - Explosion Comparative Example 5 3180 2916 8% 3168 2621 17% 3193 2569 20% Explosion Comparative Example 6 3160 2983 6% 3139 2636 16% 3174 2605 18% Comparative Example 7 3140 2910 7% 3172 2632 17% 3132 2527 19% Comparative Example 8 3227 2971 8% 3221 2618 19% 3226 2551 21% Explosion Comparative Example 9 3252 3093 5% 3251 2685 17% 3246 2622 19% Comparative Example 10 3235 2969 8% 3231 2645 18% 3238 2571 21% Comparative Example 11 3265 3042 7% 3258 2680 18% 3239 2580 20% Explosion Comparative Example 12 3266 3095 5% 3261 2707 17% 3275 2593 21% Explosion Comparative Example 13 3270 3018 8% 3270 2693 18% 3254 Measure
Impossible - Explosion Comparative Example 14 3254 3010 7% 3251 2646 19% 3256 2560 21% Comparative Example 15 3242 3087 5% 3235 2675 17% 3234 2616 19% Comparative Example 16 3240 2978 8% 3242 2647 18% 3229 2584 20% Example 1 3264 3021 7% 3251 2663 18% 3225 2587 20% Explosion Example 2 3240 3074 5% 3234 2664 18% 3244 2632 19% Example 3 3260 3028 7% 3256 2669 18% 3267 2634 19%

Since the fibers melt after the fire, voids are formed and the heat transfer is performed by the voids, so that the water vapor pressure and the thermal stress of the mortar are stabilized and the explosion can be prevented. In this experimental example, the weight was measured and the degree of porosity was confirmed.

Referring to Table 3, it was confirmed that the compression strength retention ratios of Examples 2 and 3 were superior to those of Comparative Examples. In Example 1, the content of fibers is too small as compared with cement, and the effect of refractory and lubrication is expected to be insignificant.

From the test results, it can be seen that the refractory mortar according to the present example is excellent in strength and durability without fire explosion even in a fire of 900 캜.

[ Experimental Example  3: Depends on heating temperature Specimen  Temperature]

In order to confirm the internal temperature of the heating furnace and the thermal resistance and heat resistance of the refractory panel, a refractory panel was installed on the structural member of the reinforced concrete beam using the high strength concrete and the heating test according to the standard heating curve (1 h) A k type thermocouple sensor was attached to the refractory panel and the attachment of the structure. Temperature was measured by attaching a thermocouple sensor to the tensile and compression bars to measure the temperature inside the reinforced concrete beam.

We measured the tensile and compressive strength of reinforced concrete beams during the test and the temperature changes of the panel and the reinforced concrete bays in real time. The temperature change characteristics of each thermocouple were examined based on the recorded contents.

Heating time (hours) Tensile steel temperature (℃) Compressive steel temperature (℃) Panel inside temperature (℃) Remarks Comparative Example 1 1:12 438.3 575.5 - Standard Specimen Comparative Example 2 1:18 178.2 239.8 489 Comparative Example 3 1:18 185.3 232.5 404.6 Comparative Example 4 - - - - - Comparative Example 5 1:18 221.2 397.0 436.7 Comparative Example 6 1:30 146.1 133.4 803.6 Comparative Example 7 1:15 124.3 149.2 382.5 Comparative Example 8 1:18 221.2 397.0 436.7 Comparative Example 9 1:30 146.1 133.4 803.6 Comparative Example 10 1:15 124.3 149.2 382.5 Comparative Example 11 1:28 106.1 137.2 467.9 Comparative Example 12 1:25 98.4 122.2 358.7 Comparative Example 13 1:10 105 102 158.4 Comparative Example 14 1:16 173.4 204.9 750.2 Comparative Example 15 1:30 111.1 150.2 791.5 Comparative Example 16 1:16 153.1 142.0 725.5 Example 1 1:24 177.9 201.3 750.2 Example 2 1:12 147.2 111 201.1 Example 3 1:24 127.1 130.8 192.3 Comparative Example 17 1:16 116.7 155.6 310.4 Comparative Example 18 1:25 291.5 348.8 589.2 Fireproof panel explosion Comparative Example 19 1:10 116.7 116.3 167.2 Comparative Example 20 1:15 140.8 132.9 175.8 Example 4 1:15 123.0 103.1 168.8

In the case of the standard specimen of Comparative Example 1, the temperature of the tensile and compressive reinforcing bars was increased to about 600 ° C. due to the heating of the refractory panel to prevent explosion of high-strength concrete. I could confirm.

In the case of refractory panels applied with refractory mortar developed in this technology development, the temperature of tensile and compression bars was below 200 ° C in general, and in the case of the test panel in which the refractory panel was provided with mesh, Except for the temperature rise within 150 ℃.

Comparative Example 14 in which 0.15% of PP fiber and PVA fiber were mixed showed the lowest temperature increase rate. In Examples 1 to 3, in which PP fiber and steel fiber were mixed with the specimen containing the steel fiber, and Example 4 The temperature rise rate was low.

The temperature of the reinforced concrete beams and the temperature inside the refractory panel were compared with each other according to the heating temperature, and the temperature change of the fire resistant mortar panel structure was confirmed by the application of the refractory mortar fireproof panel. As a whole, the temperature of tensile and compressive reinforcing bars was found to be slowed down by the use of refractory panels. However, the internal temperature of the refractory panel increased sharply during heating. It is considered that the cracks in the refractory panel affected the temperature of the thermocouple in the refractory panel through the cracks.

[ Experimental Example  4: Refractory mortar Appearance ]

In order to classify fire-resistant mortars according to the occurrence of explosion, the concept of classification of explosion test bodies is shown as 1 to 4 grades as shown in FIGS. 7 and 8 based on the coating thickness specification on the concrete standard specification and the fire grade classification according to the blood on the fire. The external appearance of the refractory mortar was tested and shown in Fig.

As a result of examining the explosion grade of the explosion test body classification concept and the appearance characteristic of the explosion of the refractory mortar shown in the present technology development, the explosion was not generated at the heating temperature of 300 ° C on the 7th day of the year, , Comparative Example 8 (including only PVA), Comparative Example 12 (including steel fiber only), Comparative Example 14 (including PVA and PP only), Example 1 (including PVA fiber and steel fiber less than 0.05 part skin), and all other specimens showed grade 1.

At 900 ° C., all of the specimens of Comparative Examples 1, 2, and 4 in which the fibers were not mixed showed a grade of 4 due to spalling, and only one type of fiber was included or a grade of 3 was included if the content was too small.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

101: drying shrinkage crack 102: horizontal crack due to temperature change
103: tangential crack 104: radial crack
105: Constituent material self-cracking
201: Rise of water vapor pressure 202: Thermal stress crack
S301: Heat penetration and water vapor transfer S302: Accumulation of water vapor
S303: Formation of a saturated layer and increase of steam pressure S304:
S401: Mold making step S402: Dry beam step
S403: water mixing step S404: fiber mixing step
S405: Discharging step S406: Flow test step
S407: Placement step S408: Mesh installation step
S409: hardening step
S501: Mold making step S502: Reinforcement assembling step
S503: Rebar placement step S504: Thermocouple installation step
S505: Concrete pouring step S506: Concrete member
S601: Concrete member demolding step S602: Member drilling step
S603: Perforated site cleaning step S604: Anchor installation step
S605: Bolt installing step S606: Panel fitting step
S607: Grinding step of panel protrusion S608: Step of attaching thermocouple
S609: filling member and panel joint S610: assembling bolt assembly step
S611: Thermocouple extension step S612: Thermocouple test step
S613: Refractory panel constructions for high strength concrete

Claims (6)

High-strength concrete member, and
And a refractory panel located on one side of the high strength concrete member,
The refractory panel includes cement, sand sand, blast furnace slag, organic fiber and steel fiber,
The sandy silica has a particle size of 112 to 188 탆, a specific gravity of 2.5 to 2.7,
The blast furnace slag fine powder has a particle diameter of 8 to 14 mu m, a specific gravity of 2.8 to 3.0 and a powder degree of 3,800 to 4,200 cm < 2 > / g,
The organic fibers are micropolypropylene fibers having a diameter of 30 to 60 占 퐉, a length of 50 to 100 占 퐉, a specific gravity of 0.5 to 1.5, and a tensile strength of 2,600 to 2,800 MPa,
The steel fiber has a diameter of 1 to 20 mu m, a length of 10 to 20 mm, a specific gravity of 0.5 to 1.5 and a tensile strength of 3,600 to 3,800 MPa,
The organic fibers and the steel fibers are hollow fibers having a porosity of 30 to 70% by volume
Fireproof panel structure for preventing high intensity concrete explosion. The method according to claim 1,
The blast furnace slag fine powder is contained in an amount of 15 to 25 parts by weight based on 100 parts by weight of the cement,
The organic fiber and the steel fiber are included in 0.05 to 0.5 part skin to 100 parts of the skin of the cement and the blast furnace slag powder
Fireproof panel structure for preventing high intensity concrete explosion. delete delete delete Cement, sand sand and blast furnace slag,
Water mixing step of mixing water with the above-mentioned dry bean-cemented cement, sandy silica and blast furnace slag mixture,
A fiber mixing step of further mixing and mixing the organic fiber and the steel fiber with the water-mixed cement, sandy silica, and blast furnace slag mixture,
A panel manufacturing step of discharging and curing the mixture of cement, sand sand, fine blast furnace slag, organic fiber and steel fiber to produce a panel form, and
Placing the panel on one side of the high strength concrete member,
The sandy silica has a particle size of 112 to 188 탆, a specific gravity of 2.5 to 2.7,
The blast furnace slag fine powder has a particle diameter of 8 to 14 mu m, a specific gravity of 2.8 to 3.0 and a powder degree of 3,800 to 4,200 cm < 2 > / g,
The organic fibers are micropolypropylene fibers having a diameter of 30 to 60 占 퐉, a length of 50 to 100 占 퐉, a specific gravity of 0.5 to 1.5, and a tensile strength of 2,600 to 2,800 MPa,
The steel fiber has a diameter of 1 to 20 mu m, a length of 10 to 20 mm, a specific gravity of 0.5 to 1.5 and a tensile strength of 3,600 to 3,800 MPa,
The organic fibers and the steel fibers are hollow fibers having a porosity of 30 to 70% by volume
(METHOD FOR MANUFACTURING REINFORCED PANEL STRUCTURES FOR PREVENTING HIGH -

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