KR101460632B1 - Rapid hardening concrete composition for road repair containing steelmaking reducing slag powder and method of pave a road using the same - Google Patents

Abstract

The present invention is characterized in that 10 to 20% by weight of quench steel reduced slag powder, 35 to 45% by weight of fine aggregate, 30 to 40% by weight of coarse aggregate, The present invention relates to a concrete composition for rapid repair using a rapidly-reduced steel slag powder containing 1 to 3% by weight of latex and 4 to 6% by weight of a blend steel as a binder, and a method for repairing concrete pavement using the same, The use of steelmaking slag powder can replace the fast-cemented cementitious binder, reduce carbon emissions from the cement production process, reduce environmental damage, and improve economic efficiency.
Also, the compressive strength of 21 MPa or more is exhibited within 4 hours after the placement of the quick-setting concrete to minimize the curing time, and the excellent long-term concrete resistance has excellent resistance to melting and waterproofing, thereby prolonging the life of the concrete pavement.

Description

Technical Field [0001] The present invention relates to a concrete composition for rapid repair using a rapidly-reduced steel slag powder as a binder, and a road repairing method using the slag powder.

The present invention relates to a concrete composition for rapid repair using a rapid-reducing steel slag powder as a binder, and a road repair method using the same. More particularly, the present invention relates to a concrete composition for repairing slag, Wherein the rapid-cooling steel slag powder is pulverized by spraying and spraying a high-pressure and high-speed gas and then quenched and used as a substitute for ultra-rapid cement. The present invention relates to a road maintenance method.

Generally, various types of deterioration and breakage occur in concrete pavement due to the action of traffic load caused by vehicle and environmental load due to climate change. Maintenance and reinforcement of such aged concrete pavement is essential, and it is very difficult to block or bypass traffic. For this reason, the bridge pavement should be designed and constructed to have long-term commonality at the time of construction.

Particularly, such aged concrete pavement has recently increased in repair cost, and aging concrete pavement extension is expected to increase rapidly in the future. Therefore, when considering the amount of aged concrete to be rapidly increased in the future, it is urgent for Korea to provide fundamental repair and reinforcement measures for old concrete pavement.

In addition, as the problem of environmental destruction due to the production of cement is emerging as a serious social problem, the government is implementing the low carbon green zone policy. Therefore, it can be a remarkable alternative when eco-friendly high-value-added materials are applied to the current concrete pavement repair material. To this end, it is urgently required to develop next-generation concrete technology that contributes to environmentally friendly low carbon green growth by replacing cement with industrial byproducts.

In view of the recent trends in the development of concrete-packing repair materials using slag blasting, an environmentally-friendly high-value-added material, Korean Patent Registration No. 10-1234787 discloses a method of manufacturing a tundish And sprayed with high-pressure air to disperse the molten reduced slag to the air, quenched to 600 占 폚 or lower to quench the rapidly cooled bead-shaped particles so as to have no glass lime, to have a powdery degree of 3,000-12,000 cm2 / g And a reducing slag powder. The present invention has been accomplished on the basis of these findings.

Korean Patent Registration No. 10-1234787 discloses a rapid-cooling steel slag powder (RC-LFS Powder) obtained by pulverizing and quenching a high-pressure and high-speed gas by spraying and scattering high-velocity and high-velocity gas into an electric furnace melting slag during iron- A retarder used for retarding the solidification of the quench steel reduction slag powder in reaction with water and a gypsum used for delaying the solidification of the quench steel reduction slag powder in reaction with water and for improving initial and long- Wherein the quenching steel reducing slag powder is sprayed and scattered at a high pressure and a high velocity gas for 5 to 10 seconds to the molten reducing slag, and the molten reducing steel slag is subjected to the melting and reducing treatment at 1,300 to 1,400 ° C The slag is pulverized to a temperature of 400 to 600 DEG C and pulverized to have a powder degree of 3,000 cm < 2 > / g or more, and the gypsum is anhydrous gypsum, And the retarder is at least one selected from the group consisting of citric acid powder and tartaric acid powder, and the gypsum is used in a weight ratio of 60:40 to 90:10 by weight of the quenched steelmaking reduced slag powder: gypsum, , And the retarder is used in a weight ratio of 100: 0.1 to 100: 2 by weight of the quench-hardened steel slag powder: retarder, based on the weight of the quench steel reduction slag powder.

However, although the hydraulic binders shown in the above patent use reduced slag powders as industrial by-products and exhibit ultra-fast hardness or hydraulic properties, they are inferior in durability, compressive strength, flexural strength, The present inventors have found that it is impossible to exhibit road pavement properties such as adhesion strength, freeze-thaw resistance and waterproof performance, and therefore, the present inventors have found that the use of a rapidly solidified slag powder as a binder as a cement- The present invention has been completed.

Disclosure of the Invention The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a concrete composition for rapid repair using a rapidly-slaked reducing slag powder as a by-product instead of a cement- do.

In addition, since the curing time is very short due to the use of the rapidly reducing slag powder, the present invention minimizes the inconvenience of the customer and the burden on the user by opening the traffic early due to the quick construction and also maintains the structural function of the road, The present invention provides a road maintenance method using a concrete composition for quick repair using a rapidly-reduced steel slag powder as a binder.

In order to solve the above-mentioned problems, the present invention uses quench-hardened steel slag powder as a binder instead of a cement-based quick hardening binder as a binder and includes quench steel reduction slag powder, fine aggregate, coarse aggregate, latex, The present invention provides a concrete composition for a quick-repair road using a rapidly-cooled steel-making reduced slag powder as a binder.

The present invention also provides a method for producing a slag comprising the steps of: 10 to 20% by weight of quenching steel reduction slag powder, 35 to 45% by weight of fine aggregate, 30 to 40% by weight of coarse aggregate, 1 to 3% by weight of latex and 4 to 6% The present invention provides a concrete composition for repairing a quick-hard road using a rapidly-reduced steel slag powder as a binder.

In addition, the quick-repair concrete composition using the reduced-slab steel reducing slag powder as a binder exhibits a compressive strength of 21 MPa or more after 4 hours of pouring.

The present invention also provides a method of manufacturing a semiconductor device, A grinding step; Cleaning and drying phase; Production and installation of a quick-repair concrete composition comprising a rapid-cooling steel reduction slag powder, a fine aggregate, a coarse aggregate, a latex, and a mixed water; And a method of repairing roads using a concrete composition for quick repair using a rapid-reducing steel slag powder containing a curing step as a binder.

The present invention also provides a method of manufacturing a semiconductor device, A grinding step; Cleaning and drying phase; The concrete for quick repair, which comprises 10 to 20% by weight of quench-reducing steel slag powder, 35 to 45% by weight of fine aggregate, 30 to 40% by weight of coarse aggregate, 1 to 3% by weight of latex and 4 to 6% Production and installation of the composition; And a method of repairing roads using a concrete composition for quick repair using a rapid-reducing steel slag powder containing a curing step as a binder.

The concrete composition for rapid repair using the rapid-cooling steel reduction slag powder of the present invention as a binder is a carbonaceous material which is produced by replacing the cement-based quick-setting binder by using quench steel reduction slag powder as an industrial by- The environmental damage can be reduced and the economical efficiency can be improved.

Also, the quick-repair concrete composition using the rapid-cooling steel slag powder as a binder exhibits a compressive strength of 21 MPa or higher within 4 hours after the pouring, and has excellent freeze-thaw resistance and waterproofing performance, thereby prolonging the life of the concrete pavement It is effective.

1 is a photograph showing a quenched and reduced steel slag aggregate according to the present invention
2 is a photograph of a quench-reduced slag fine powder according to the present invention
FIG. 3 is a graph showing the relationship between the slag air quenching process
4 shows the oxide composition of the quench-reduced slag according to the present invention
FIG. 5 is a graph comparing the mineral composition of the reducing slag according to the present invention after slow cooling and quenching
FIG. 6 is a graph showing the coagulation characteristics of the quench-reduced slag fine powder according to the amount of retarder used
7 is a graph showing the compressive strength characteristics of the quenching-reduced slag fine powder according to the present invention

The present invention uses quench steel reduced slag powder as a binder in place of cement-based quick hardenable binder as a binder, and is characterized in that quench steel reduced slag powder comprising quenched steelmaking reduced slag powder, fine aggregate, coarse aggregate, latex, The present invention relates to a concrete composition for repairing a quick-hard road which is used as a high-strength concrete.

The present invention also provides a method for producing a slag comprising the steps of: 10 to 20% by weight of quenching steel reduction slag powder, 35 to 45% by weight of fine aggregate, 30 to 40% by weight of coarse aggregate, 1 to 3% by weight of latex and 4 to 6% The present invention relates to a concrete composition for rapid repair using a rapidly reducing slag powder as a binder.

Also, the present invention is characterized in that the quick-repair concrete composition using the reduced-slab steel reducing slag powder as a binder exhibits a compressive strength of 21 MPa or more after 4 hours of installation.

The present invention also provides a method of manufacturing a semiconductor device, A grinding step; Cleaning and drying phase; Production and installation of a quick-repair concrete composition comprising a rapid-cooling steel reduction slag powder, a fine aggregate, a coarse aggregate, a latex, and a mixed water; And a method of repairing roads using a concrete composition for quick repair using a rapid-cooling steel reduction slag powder including a curing step as a binder.

The present invention also provides a method of manufacturing a semiconductor device, A grinding step; Cleaning and drying phase; The concrete for quick repair, which comprises 10 to 20% by weight of quench-reducing steel slag powder, 35 to 45% by weight of fine aggregate, 30 to 40% by weight of coarse aggregate, 1 to 3% by weight of latex and 4 to 6% Production and installation of the composition; And a method of repairing roads using a concrete composition for quick repair using a rapid-cooling steel reduction slag powder including a curing step as a binder.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

First, as shown in FIG. 1 to FIG. 7, the quenched steelmaking reduced slag powder of the present invention is produced by spraying a high-pressure, high-velocity gas for 5 to 60 seconds to an electric furnace melted reduction slag among byproducts generated during iron- , And the molten reduced slag at 1,300 to 1,600 ° C is rapidly cooled to 40 to 90 ° C and pulverized by a powder of 3,000 to 8,000 cm 2 / g. The oxide composition thereof is 40 to 60% by mass of CaO, 5 to 20% by mass of SiO ₂ Mass% and Al ₂ O _{3 account} for 10 to 30 mass%, and they contain C ₁₂ A ₇ having a quenchability after quenching and a large amount of β-C ₂ S minerals having a stable long-term strength development, Characteristics and long-term strength, and addition of a gypsum for reducing shrinkage, a coagulation retarder for securing workability, a water reducing agent for securing workability, and a thickener for material separation resistance are selectively added thereto. Improve initial strength expression performance The curing time is very short and not only has an effect on durability, but also reduces the carbon emissions from the cement production process. Therefore, the quench steel reduced slag powder is used as a binder.

If the amount of the quench steel reduction slag powder is less than 10% by weight, there is a problem in securing strength due to shortage of binder materials and surface finishing of concrete, and in the case of exceeding 20% by weight, there is a problem in securing workability of concrete due to excessive powder It is preferable to set the total concrete composition in the range of 10 to 20% by weight based on 100% by weight of the total concrete composition of the present invention.

It is preferable that the fine aggregate is a clean and sound natural mortar or sandpaper. If it is less than 35% by weight, there is a problem in the surface finishing work of the concrete. If it exceeds 45% by weight, Therefore, it is preferable to use it in the range of 35 to 45% by weight based on 100% by weight of the total composition of the present invention.

It is preferable that the coarse aggregate is clean and strong crushed stone or gravel is used. If the size of the coarse aggregate exceeds a half of the thickness of the coarse aggregate, the water tightness of the concrete and the finish of the concrete surface are problematic Therefore, it is preferable that the thickness is 1/2 or less of the lay thickness.

When the coarse aggregate is less than 30% by weight, there is a problem in securing workability and strength. When the coarse aggregate is more than 40% by weight, there is a problem in the surface finish of the concrete. By weight to 40% by weight.

The latex preferably uses SBR (Styrene Butadiene Rubber) latex and is used for improving the physical properties of the composition of the present invention such as waterproof function, adhesion strength, durability, flexural strength, tensile strength and fluidity, If it is less than 1% by weight, there is a problem in securing fluidity and waterproof performance. If it is more than 3% by weight, there is a problem of material separation. Therefore, the content is preferably in the range of 1 to 3% by weight based on 100% .

It is preferable that the compounding water is purified water because it contains no harmful substances such as oil, acid, organic impurities, turbid water and the like which adversely affect concrete or steel, or seawater can not be used. When the blend amount is less than 4% by weight, there is a problem in securing the workability of the concrete construction work. When the blend amount exceeds 6% by weight, there is a problem in securing strength. By weight.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following embodiments are not intended to limit the scope of the present invention, and ordinary variations by those skilled in the art within the scope of the technical idea of the present invention are possible.

[ Quenching Steelmaking slag  Powder As a binder  Used Rapid hardening  Preparation of concrete composition for road maintenance]

According to KS F 2425 "Method of Making Concrete Sample in Laboratory" with the composition described in the following Table 1, a quick-mix concrete composition using a quench steel reduced slag powder of the present invention as a binder was prepared using a forced mixing mixer Respectively.

division Components (kg / m3) Number of ingredients Rapid cooling steel slag powder Latex Fine aggregate
(Less than 5 mm) Coarse aggregate
(5 mm to 19 mm) Example 119 360 61 930 767

[ Quenching Steelmaking slag  Of powder As a binder  Quality measurement]

Table 3 shows the results of measuring the powderiness, the stability, the setting time and the compressive strength by the test method shown in [Table 2] below.

As can be seen from the following Table 3, it was found that the values of powderiness, stability, setting time and compressive strength were all within the range of the reference value of [Table 2]. In particular, it can be seen that the quick-setting concrete composition using the reduced-slab steel reducing slag powder as a binder exhibits a compressive strength of 21 MPa or higher within 4 hours after being poured.

Item Test Methods     standard Powder (㎠ / g) KS L 5106 3,000 ~ 8,000 Stability KS L 5107 0.8 or less Condensation time (min) KS L 5103 Superfine  20 to 30 minutes End Less than 60 minutes Compressive strength MPa (kgf / cm2) KS L 5105 3 hours 25 (250) or more 1 day More than 30 (300) 28th 45 (450) or more

Item result Powder (㎠ / g) 5625 Stability 0.6 Condensation time (min) Superfine 23 End 47 Compressive strength MPa (kgf / cm2) 3 hours 26.2 (267.1) 1 day 34.2 (348.7) 28th 49.5 (504.7)

[ Quenching Steelmaking slag  Powder As a binder  Used Rapid hardening  Structural Property Test of Concrete Composition for Road Maintenance]

[Compressive strength]

The specimens prepared according to the method of the above example were measured for compressive strength by KS F 2405. That is, after placing the specimen so that its central axis coincided with the center of the platen, the platen of the tester and the end surface of the specimen were directly brought into close contact with each other and a load was applied at a constant speed so as not to impact the specimen, And the results are shown in Table 4.

[Bending Strength]

The bending strengths of the specimens manufactured according to the method of the above example were measured according to KS F 2408. That is, when the concrete is filled in the mold, the upper surface of the bearing is placed at the center of the bearing butterfly with the side surface as the upper surface, and the upper pressing device is contacted with the third point of the bearing. The bending strength was measured at 4 hours and 28 days, and the results are shown in Table 4.

[Bond strength]

The bond strengths of the specimens prepared according to the method of the above examples were measured according to KS F 2762. That is, the surface of the specimen is gradually applied with a force so that it is perpendicular to the surface of the specimen, and after the perforation, the core surface is coated with an epoxy resin adhesive, and then the dolly is bonded. The adhesive strength was set at a right angle to the dolly attached to the core, and then the tensile strength was applied to the core in the vertical direction to apply the load until fracture, and the adhesive strength was measured at 4 hours and 28 days. The results are shown in Table 4 Respectively.

[ Quenching Steelmaking slag  Powder As a binder  Used Rapid hardening  Test of suitability of concrete composition for road maintenance]

[Modulus of elasticity]

The upper and lower surfaces of the specimens manufactured according to the method of the above example were polished with a grinder and measured using a strain gauge having a length of 60 mm and measured according to KS F 2438 "Constant modulus of concrete circular specimen and Poisson's ratio test method" Are shown in Table 4.

[Dry shrinkage]

The specimens prepared in accordance with the method of the above example were measured at a temperature of 20 ° C and a humidity of 60% according to KS F 2424, "Method of Length Change Test of Mortar and Concrete", and using a dial gauge while maintaining the temperature and humidity The results are shown in Table 4.

[Thermal Expansion Coefficient]

The length change of the specimens manufactured according to the method of the above example according to the temperature change was measured using an expansion system manufactured by Invar support frame having a very low strain rate according to the temperature change through the LVDT by the method of AASHTO TP60-00, Are shown in Table 4.

[ Quenching Steelmaking slag  Powder As a binder  Used Rapid hardening  Durability Test of Concrete Composition for Road Maintenance]

[Scaling Resistance]

A test was conducted according to ASTM C 672. The freeze-thaw cycles were performed for a total of 50 cycles with 1 cycle of freezing at -17 ± 1.7 ° C for 16-18 hours followed by melting at 23 ± 2 ° C and 45-55% relative humidity for 6-8 hours, In order to measure the surface state every 5 cycles, the degree of surface peeling according to ASTM regulation was observed and the results are shown in Table 4.

[Resistance to freezing and thawing]

In order to measure the resistance to freezing and thawing, a frozen-thaw resistance test was conducted according to KS F 2456 (Method A - Fast Freezing and Thawing Test in Concrete Test Methods for Rapid Freezing and Thawing). One cycle was 4 hours, and the relative dynamic modulus was measured every 30 cycles. The results are shown in Table 4.

[Crack resistance]

Ring test experiments were carried out according to AASHTO PP34-98. The concrete was poured into the space between the two rings, and the outer mold was removed after 1 hour. The upper and lower parts of the concrete specimen were sealed with silicone to induce water evaporation to the outer circular surface. Thereafter, the occurrence and growth of cracks were observed for 56 days in a constant temperature and humidity chamber at a relative humidity of 45% and a temperature of 23 ° C, and the results are shown in Table 4.

[Salt penetration resistance]

 The salt penetration resistance test was performed according to KS F 2711. That is, the center portion of the specimen was cut to a thickness of 50 mm, the specimen was put in a desiccator to remove trapped air inside the specimen, the vacuum pump was operated for 3 hours, and water was added to the desiccator to saturate the specimen with water. The pump was actuated for a period of time. Thereafter, the operation of the vacuum pump was stopped and the specimen was maintained in a state of being completely saturated in water for 18 ± 1 hour. After the preparation of the specimen for the permeability experiment, the specimen was fixed to the A.V.Cell to test the permeability. (+) Electrode was filled with 0.3N NaOH solution, and the (-) electrode was filled with 3% NaCl solution. Then, 60V DC was supplied to the specimen and the current value was measured for 6 hours at 7 days and 56 days. Are shown in Table 4 below.

Item Reference value Test result 4 hours 28th Structural characteristics Flexural strength (N / mm2) 3.15 or higher 5.4 6.3 Compressive strength (N / mm2) 21.0 or higher 23.6 38.8 Bond strength (N / mm2) 1.4 or higher 1.5 2.0 Fit characteristic Elastic modulus (GPa) 11.3 to 78.0 28.0 Dry shrinkage (%) 0.15 or less 0.06 Coefficient of thermal expansion
(Micro-strain / ° C) 3.5 ~ 26 4.8 Endurance characteristic Scaling Resistance (kg / m ² ) Acceptable or higher proper Freeze-thaw resistance
(300 cycles) More than 80% 83% Crack resistance No crack up to 56 days of age No crack Salt penetration resistance
(Coulomb) 2000 or less (7 days)
1000 or less (28 days)
7 days 28th 1547 770

As shown in Table 4, it can be seen that the structural characteristics, the compatibility characteristics, and the durability characteristics of the quick-repair concrete composition using the rapid-cooling steel reduction slag powder of the present invention as the binder satisfy the reference values.

Meanwhile, a method of repairing a road using a concrete composition for quick repair using the rapid-cooling steel slag powder of the present invention as a binder will be described in detail as follows.

[Cutting of existing pavement concrete and Grinding ]

In order to ensure adequate curing time and to minimize traffic interruption time, cutting equipment should be operated to cut the damaged part of the existing pavement concrete quickly. The upper surface of the damaged pavement concrete is completely removed to the depth specified in the design book using cutting equipment (road surface crusher and water jet). Use a hand breaker to cut off parts that are difficult to remove by applying cutting equipment.

The road surface crusher must be capable of cutting the surface of the concrete to a specified depth and be capable of collecting or disposing foreign matter or dust generated by the operation of the equipment.

Water jets are equipment that is used to remove damaged concrete under rebar without damaging existing reinforced concrete or concrete, and a scattering-prevention network should be installed to prevent splashes from splashing.

If the upper reinforcing bars are exposed or hanging during the use of the road surface crusher, the cutting should be stopped immediately and the cutting should be performed by water jet method.

Concrete cutting equipment (room temperature cutting machine) should be a device that can evenly cut the deteriorated concrete surface to a desired depth, and should be able to collect or dispose of foreign substances or dust generated by the operation of the equipment. In order to be efficient equipment.

The surface preparation equipment should be a device that can remove the weak concrete on the surface including the damaged concrete on the surface caused by the cutting by the room temperature cutting machine.

[ Deteriorated portion  Removal, cleaning and drying of bridges]

The cutting waste generated by the road surface crusher and the water jet is accumulated in a skid loader and loaded on a dump truck to be treated at a designated waste disposal site. Cutting foreign matter and moisture not removed by a skid loader are sucked and removed by a vacuum suction truck.

Vacuum suction trucks are equipment to suck and clean fine material and water used in water jet milled by water jet. It should be equipped with suction force capable of suctioning cutting foreign matter located under reinforcing bars. The loading capacity should be more than 6㎥ And shall be equipped with a suction hose.

The surface condition after cutting greatly affects the repair and reinforcement effect and the adhesion of new and old concrete. It is necessary to confirm whether there is an unsatisfactory section such as waterproof layer and damaged concrete on the cutting surface after cleaning is completed. do.

Vacuum equipment must be a device with a suction force to suction the cutting debris from deep below the reinforcement as equipment for suction, cleaning the foreign substances such as fine material or dust crushed by a cutting device, and load capacity to be less than 6m ³ And shall be equipped with a suction hose.

[ Quenching Steelmaking slag  Powder As a binder  Used Rapid hardening  Production and Installation of Concrete Composition for Road Maintenance]

The production of the concrete composition for quick repair using the rapid-cooling steel slag powder of the present invention as a binder is carried out by using a mobile mixer which is a movable batch plant. The mobile mixer loads each material before the completion of the cleaning process, . In order to improve the adhesion of the fast-curing low-carbon eco-friendly cementitious concrete composition of the present invention, the floor concrete is maintained in a wet state in order to eliminate defects at the new and old boundary.

The mobile mixer is a device that can mix each material quantitatively and must be equipped with a control valve that can control the amount of blend so that it can continuously produce concrete of uniform quality. In principle, there should be a separate storage bin for each material and a weighing device for accurate weighing.

The coarse aggregate, the quenching steelmaking reducing slag powder, the fine aggregate, the latex, and the compounding water are put into the mobile mixer in order, and the mixing is performed for more than the time required to ensure the required workability. The composition of the present invention discharged from the mixer should be uniform until the constituent components and the kneading agent are finished to be installed, and the concrete should have a sufficient capacity so that the concrete can be continuously installed.

In order to enhance the adhesion of the composition of the present invention and to eliminate defects on the old and new boundary surfaces, a small amount of mortar is subjected to a brooming operation by applying a small amount of a mortar to a surface of a conventional bottom plate using a brush or a suitable tool.

The installation shall be carried out before the broomed surface of the surface is dry, the laying thickness shall be at least 30 mm and it shall be finished by vibration compaction.

[Finishing and Curing]

Finishing should be done with concrete roller paver to satisfy the compaction and flatness of the requirements. If it is difficult to apply the concrete roller pavers, use a screed to finish the installation. In the present invention, tinning is performed for rough surface finishing. The spacing of the tinings is 30 mm and the depth is 2 to 3 mm.

The curing agent should be sprayed and cured until the traffic is opened after the completion of the laying so as not to be adversely influenced by drying, temperature change, load, impact and so on.

If the formability is maintained on the surface after completion of laying, tinning should be carried out immediately or grooving should be performed after curing to obtain a sufficient coefficient of friction.

The coating curing agent should be oil-based and should be uniformly sprayed on the entire surface, and in no case should there be any part of the curing agent not sprayed.

Finishing and tanning equipments should be able to control the width and height of the concrete pavement to ensure the flatness of the concrete pavement. Tanning equipment should be equipments to ensure the space and depth of the concrete pavement.

Curing is done by curing the concrete for 3 hours after installing the concrete. However, if the ambient temperature is below 5 ℃, the curing period can be extended. During the curing period, adequate protection against adverse effects such as temperature changes, loads and impacts shall be carried out.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments and the drawings disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (5)

delete Wherein the steel sheet comprises 10 to 20% by weight of quenching steelmaking reducing slag powder, 35 to 45% by weight of fine aggregate, 30 to 40% by weight of coarse aggregate, 1 to 3% by weight of latex and 3 to 6% by weight of compounding ratio, The slag powder is sprayed and scattered by a high-velocity gas for 5 to 60 seconds to the electric furnace melted reducing slag among the byproducts generated during iron smelting at the steelworks, and the melted reducing slag at 1,300 to 1,600 ° C is rapidly cooled to 40 to 90 ° C, / g powder, the composition of which contains 40 to 60% by weight of CaO, 5 to 20% by weight of SiO ₂ and 10 to 30% by weight of Al ₂ O ₃ , and 21 MPa or more at 4 hours after pouring Wherein the rapid-cooling steel slag powder is used as a binder. delete delete delete

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