KR101975001B1 - The repairing method and repairing material by recycling pig iron slag - Google Patents

Abstract

The present invention relates to a repairing method of recycling a molten iron slag, and specifically, to a repairing material of recycling a molten iron slag, which is possible to prominently improve a material property such as liquidity, a permeability coefficient, strength and bleeding than before and is possible to reduce a construction cost in accordance with resource recovery and technology convergence of the molten iron slag by developing an activator capable of activating the molten iron slag and developing a repairing material and a repairing method using the same, and a repairing method using the repairing material, which uses expanded metal in a mesh shape to favorably come in contact with existing concrete, is easy to be handled and constructed to be possible to reduce a construction period, has excellent durability, and isn′t deformed by impact.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a repair material and a repair method for recycling molten slag,

The present invention relates to a repair material and a repair method in which molten steel slag is recycled.

Specifically, the properties such as fluidity, permeability coefficient, strength, bleeding and the like can be remarkably improved as compared with conventional repair materials, and an activator capable of activating charcoal slag has been developed and a repair material utilizing the same has been developed, The present invention relates to a repair material and a repair method for recycling molten steel slag that can reduce the cost of repairing a structure due to resource conversion and technology fusion.

Charcoal slag is one of steel waste and may be called steel slag. Steel slag is classified as a blast furnace slag, a steel slag, and a charcoal slag depending on the process and the process, which are by-products and wastes generated in the steelmaking process.

In Korea, blast furnace slag and steelmaking slag produced in 2008 are about 8.8 million tons and 9.1 million tons, respectively. The amount of electric furnace slag generated in steelmaking slag is 4.5 million tons, and that of converter slag is 4.6 million tons. The development of recycling technology for each slag has already achieved remarkable results, but the molten slag generated in the pre-treatment of molten iron is being abandoned as a whole waste, which is a huge resource and environmental loss.

Therefore, in order to achieve the above object, in this study, fusion of molten slag and activator material, which is a by-product of steel industry, It is necessary to develop maintenance materials and repair methods for eco-friendly concrete in which molten steel slag powder, which is an industrial byproduct, is mixed.

On the other hand, in the steel industry, the inventory amount increases due to the difficulty in the generation and processing of byproducts, and the construction industry has a problem in that the purchase price of construction materials is increased due to the rise of the price.

And the technology developed in Korea introduces eco-friendly technology that reduces environmentally harmful substances and applies a method to improve construction performance. However, the complexity of the form and use of recently constructed structures, and the demand for higher technology and cost competitiveness, have already created the need for new technology.

Registered Patent Publication No. 10-1586818 (issued on January 21, 2016) Japanese Patent Application Laid-Open No. 10-2015-0128872 (Nov. Patent Registration No. 10-1612907 (Announcement of Apr. 19, 2016) Registered Patent Publication No. 10-1333084 (issued on November 28, 2013)

It is an object of the present invention to provide a self-filling type high performance fluidized bed technology capable of significantly improving the properties such as fluidity, permeability coefficient, strength and bleeding, and developing an activator capable of activating charcoal slag As a result of the recycling of charcoal slag and the fusion of technology, it is possible to reduce the construction cost,

In addition to these repair materials, it is also possible to use a mesh-like expanded metal to provide a repair material for good contact with existing concrete, easy handling and construction, shortening of air, durability, And to provide a repair method using the same.

According to the present invention, there is provided a method of reusing charcoal slag according to the present invention,

(A) installing an expanded metal in an anchor bolt in a concrete matrix; And (b) after step (a), the repair material is molten onto one side of the expanded metal,

The expanded metal is formed of a plurality of meshes, and is characterized in that it is plated with zinc.

At this time, the maintenance material recycled for the charcoal slag is 40 to 60 parts by weight of charcoal slag; 30 to 50 parts by weight of cement; And 1 to 15 parts by weight of a reaction promoter.

Further, in the repairing material recycled for the molten steel slag according to the present invention, the reaction promoter is characterized by comprising a hydration reaction stimulant, a hydration reaction improving agent, a molten slag surface irritant, and an alkali reaction promoter.

In the maintenance material recycled for the molten steel slag according to the present invention, the reaction promoter may be selected from calcium aluminate and calcium sulphoaluminate, which are the hydration reaction stimulants, acetic acid which is the charcoal slag surface irritant, and manganese SiO ₂₎ z-AlO _2] is characterized in that it consists of n · wH ₂ O.

Further, in the repairing material recycled in the molten steel slag according to the present invention, the reaction promoter further comprises silica fume as the hydration reaction improving agent.

The repair method of recycling molten steel slag according to the present invention can remarkably improve the properties such as fluidity, permeability coefficient, strength, bleeding and the like, and has developed an activator capable of activating charcoal slag, It is possible to reduce the cost of construction work due to the recycling of charcoal slag and the fusion of technology.

In addition, the maintenance method using the repair material is advantageous in that it is in good contact with existing concrete, can be handled and constructed easily, can be shortened by using expanded metal in mesh form in addition to the repair material, There is an effect that it can be prevented from being deformed by impact.

The effects of the present invention are not limited to those mentioned above, and other solutions not mentioned may be clearly understood by those skilled in the art from the following description.

1 is a view for explaining a repair method of recycling molten steel slag according to the present invention.
FIG. 2 is a view showing an installation detail of an expanded metal used in a repair method for recycling molten steel slag according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, and these may vary depending on the intention of the user, the operator, or the precedent. Therefore, the definition should be based on the contents throughout this specification.

Example 1. Repair material that recycled charcoal slag

The present invention is characterized by recycling molten steel slag from steel iron by-products. As shown in Table 1 below, molten iron slag has a very small content of harmful heavy metals, but contains a large amount of Fe ions, There is a problem in that the reactivity is low due to a very low strength after curing.

division SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ CaO MgO SO ₃ TiO ₂ Blast furnace slag 35.08 10.87 0.52 43.10 3.60 2.36 1.20 Charcoal slag 11.36 16.49 22.06 34.30 5.57 0.15 0.17

On the other hand, charcoal slag is activated by strongly alkaline material such as cement. As shown in Table 2 below, the molten slag activity test SO ₃ content is high, and the long-term durability of the molten slag may be deteriorated over time when mixed with cement. Among the charcoal slag components, CaO has a very high initial absorption and there is a risk of expansion due to heat generation. The excess use of cement for charcoal slag activity is very dangerous to the environment, so it is possible to activate charcoal slag by slag powder, fly ash and alkaline activator. However, it is possible to lose price competitiveness due to an increase in manufacturing cost due to overuse of active fire-retardant materials.

division Specific surface area (Blaine)
(Cm < 2 > / g) Comp.Strength (Mpa) 3 days 7 days 28th Blast furnace slag 4,480 8.8 17.5 43.1 Charcoal slag 4,650 11.4 18.6 38.1

In order to solve the problem of durability deterioration due to the use of the charcoal slag, the repair material recycled with the charcoal slag of the present invention comprises 40 to 60 parts by weight of molten iron slag, 30 to 50 parts by weight of cement and 1 to 15 parts by weight of a reaction promoter.

The reaction promoter is preferably composed of a hydration reaction stimulant, a hydration reaction improvement agent, a molten slag surface irritant, and an alkali reaction promoter.

And the reaction accelerator is in the hydration reaction stimulator of calcium aluminate and calcium sulfur aluminate and hydrated silica fume reaction modifier and, with the molten iron slag surface stimulator of acid, alkaline reaction promoter _{Mn [(SiO 2) z-} AlO _2] n · wH may be mentioned that consisting of O _2.

Among them, the hydration reaction improver is intended to solve the problem that the hydration reactivity is lowered because the SiO ₂ content is lower than that of the general blast furnace slag fine powder. The silica fume is composed of SiO ₂ as a main constituent, and the fine pores of the hydrate are filled And the deterioration of physical properties is improved.

The physical / chemical properties of such silica fumes are shown in Table 3 below.

importance Powder (m < 2 > / g) PH Average particle diameter SiO ₂ MgO SO ₃ 2.2 15-25 2.0 to 4.0 0.15 over 90 Not more than 1.0% 3.0% or less

It is known that the by-product of molten iron slag in steel industry has some hydration, but its effect is not great and it is difficult to use it as an industrial material in itself. Therefore, it is necessary to develop a stimulant (active) known activity (stimulating) substance is sodium hydroxide (sodium hydroxide, NaOH), sodium silicate _{(sodium silicate, Na 2 SiO 3} ) , etc. are generally known, but in the present invention, since it is difficult for use in the surface compatibility and economical, yet environmentally friendly economic , A charcoal slag surface irritant, and an alkali reaction promoter.

The hydration reaction stimulant is used to overcome the problem caused by the decrease in the hydration reactivity and the lack of the ettringite activity as the amount of the molten slag is increased through the activation test of the molten slag, and the calcium aluminate powder and the calcium sulfoaluminate To improve initial hydration reactivity.

The charcoal slag surface irritant may be exemplified by acetic acid for activating a glass film structure which surrounds the surface of the molten slag and inhibits the reactivity.

In order to improve the reactivity of charcoal slag, the comparison of charcoal slag selected with high fineness of 5,000 Blaine and 6,000 Blaien has been carried out to increase the compactness of fluidized tofu structure mixed with fire and minimize the amount of cement used. Environment-friendly functionality that suppresses the generation of heavy metals and the like.

And serves to accelerate the hydration reaction of the alkaline reaction accelerator molten iron _{slag, Mn [(SiO 2) z} -AlO 2] n · wH 2 O ( wherein n = degree of polymerization, z = number of silicate, w = indicates the number of molecules of water ) Can be exemplified. These _{Mn [(SiO 2) z-} AlO 2] n · silicate chains of _{wH 2 O (silicate chain, SiO} ) is sialic rate (sialate, SiO-Al), or siloxane-bovine (siloxo, Si-O- Si). ≪ / RTI >

In the present invention, the following experiment was conducted to evaluate the performance of the repairing material having the above-described structure.

1. Experimental material

The repairing material of the present invention usually comprises 40 parts by weight of one kind of Portland cement, 50 parts by weight of molten slag, and 10 parts by weight of a reaction promoter.

Here, the reaction promoter is composed of silica fume, calcium aluminate, sulfur aluminate, acetic acid, and Mn [(SiO ₂ ) z -AlO ₂ ] n.wH ₂ O in a weight ratio of 1: 0.2: 0.3: 1.5: 0.7, respectively.

2. Experimental results

The results of the repair using the repair material of the present invention are shown in Table 4 below.

Evaluation items
(Main performance spec) unit World-class
(Holding country / holding organization) Before Research
Domestic level Experiment result Assessment Methods 1. Fluidity mm 500 or more
(Japan / Denka) 450 650 KS F 2402 2. Permeability coefficient cm / sec -
(Japan / Denka) - 1 ^{- 6} or less KS F 2322 3. 3 day strength MPa 0.2
(Japan / Denka) 0.1 0.26 KS F 2405 4. 7 day strength MPa 0.5
(Japan / Denka) 0.3 0.7 KS F 2405 5. 28 day strength MPa 0.8
(Japan / Denka) 0.6 1.0 KS F 2405 6. Bleeding % 1.5
(Japan / Denka) 1.5 0.9 KS F 2414 7. C ^{6 +} Emissions / L 1.5
(Japan / Denka) 1.5 1.0 or less Waste process
Test basis 8. Pb Generation / L 5.0
(Japan / Denka) - 3.0 or less Waste process
Test basis 9. Cd Generation / L 0.5
(Japan / Denka) - 0.3 or less Waste process
Test basis 10. Hg Generation / L 0.01
(Japan / Denka) - 0.005 or less Waste process
Test basis 11. Field injection performance evaluation m - - 1.0 or higher Self-field evaluation  Performance indicators 1 ~ 11 are based on the test report of Korea Institute of Construction & Living Environment Test.

As a result of the repair work using the repairing material of the present invention, it can be seen from Table 4 that the physical properties such as fluidity, permeability coefficient, strength, bleeding and the like are remarkably improved and the amount of heavy metal eluted is remarkably reduced.

It is expected that the use of the repairing material according to the present invention can more actively utilize charcoal slag, such as surface hardening treatment, which is hardly used compared to blast furnace slag since the compression strength is lowered.

Example 2. Repair method using repair material recycled with molten iron slag

The repair method for preventing cracking of concrete structures and reinforcing concrete by using the repair material recycled by the molten steel slag according to the first embodiment described above is as follows.

1. Steps to Install Ex-Fendered Metal on Existing Concrete Matrix

In the step of installing the ex-fendered metal on the existing concrete matrix, as shown in Fig. 1 of the accompanying drawings, the step of installing the ex-fendide metal on the matrix, which is the existing concrete, by using the anchor bolts.

1 is a view for explaining a repair method of recycling molten steel slag according to the present invention.

According to FIG. 1 of the accompanying drawings, an x-fendred metal is configured to be fastened to an concrete body using an anchor bolt.

At this time, the expanded metal is galvanized and can be referred to FIG. 2 of the accompanying drawings.

FIG. 2 is a view showing an installation detail of an expanded metal used in a repair method for recycling molten steel slag according to the present invention.

2 of the accompanying drawings is formed with a plurality of meshes, and can be fastened to the concrete matrix with an anchor bolt through a mesh region on one side.

2. Steps to install the mold to the periphery of the installed expanded metal

In the step of installing the mold to the periphery of the installed expanded metal, the step of installing the expanded metal on the existing concrete matrix, the mold for mounting the repair material poured for the maintenance purpose of the installed expanded metal is installed .

At this time, since the form can be derived by a conventional art through various conventional techniques, a detailed description thereof is omitted, and this step may be omitted in some cases.

3. Performing the repair mortar using the repair material

The step of performing the repair mortar using the repair material is a step of forming the polymer mortar layer by molding the repair material described in Embodiment 1 into the mold installed at the step of installing the mold to the periphery of the installed expanded metal.

According to the repairing method according to the second embodiment, by using the expanded metal of the mesh shape in addition to the repairing material, contact with the existing concrete is good, handling and construction are easy, air can be shortened, There is an effect that it can be prevented from being deformed by impact.

Meanwhile, according to the design conditions, the anchor bolts used in the 'step of installing the expansion metal in the existing concrete matrix' are the same as those of the conventional anchor bolts,

'의 형상을 갖는 날개를 앵커볼트의 원주방향을 따라 적어도 2개 이상 구비하도록 구성할 수 있다.After the completion of the fastening,

At least two or more wings having a shape of '' may be provided along the circumferential direction of the anchor bolt.

At this time, the inclined surface of the blade may have at least one blade corresponding to the rotation direction of the anchor bolt.

Further, the fixed blade (refer to a small area of the shape) having one side of the blade having the shape described above can be configured such that the blade is inclined with respect to the upward direction with respect to the inclined direction of the blade, have.

According to the structure of such an anchor bolt, the anchor bolt is fastened with the expansion metal, and the blade corresponding to the rotation direction of the blade enters the extruded metal partly by the rotation operation of the anchor bolt, The anchor bolt is coupled to the expanded metal, and the fixed blade is fixed to the expanded metal,

The anchor bolt can firmly fix the x-fendered metal, thereby reliably securing the release or movement of the expanded metal generated during the process of mortising the polymer mortar (the repair material of the present invention) The effect will be.

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, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (5)

(a) installing an x-fendide metal in an anchor bolt in a concrete matrix; And (b) after step (a), the repair material is molten onto one side of the expanded metal,
The expanded metal is formed of a plurality of meshes, plated with zinc,
The above-
40 to 60 parts by weight of molten slag; 30 to 50 parts by weight of cement; 1 to 15 parts by weight of a reaction promoter; Lt; / RTI >
The reaction-
A hydration reaction promoter, a hydration reaction enhancer, a molten slag surface irritant, and an alkaline reaction promoter.
The method according to claim 1,
The reaction-
Characterized in that it is composed of calcium aluminate and calcium sulphoaluminate which are hydration reaction stimulants, acetic acid which is the charcoal slag surface irritant and Mn [(SiO ₂ ) z-AlO ₂ ] n · wH ₂ O which is an alkali reaction promoter A method of reusing charcoal slag.
The method of claim 2,
Wherein the reaction promoter further comprises silica fume as the hydration reaction improving agent.
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