JP2513154B2 - Method for producing fast-curing composition - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a rapid hardening composition using a stainless steel slag containing calcium aluminate as a main component.

[0002]

2. Description of the Related Art For emergency repair of roads, prevention of collapse of water blocking walls,
For water stoppage work, roads and structures, repair work for structures, etc., and for secondary product factories that require fast formwork rotation,
A quick-hardening material is required.

The properties required for these quick-hardening materials are, of course, that they need to be hardened in a short time after the kneading, but they are required for further cracks to be repaired, for penetrating into voids in the formation, or for molds. The slurry obtained is required to maintain a certain fluidity during a certain time after kneading such as the time required for pouring into the frame, that is, during the working time required until the end of the work. In addition, it is also an important condition that the raw materials are inexpensive because they are used in large quantities for industrial use.

Conventionally, as these materials, Portland cement or mixed cement to which a setting accelerator such as sodium carbonate, calcium chloride or water glass is added, or rapid hardening cement such as alumina cement or ultra-rapid hardening cement is used. ing.

[0005] These fast-setting materials such as ultra-quick-setting cement that have been conventionally used have rapid curing, and soon after kneading, the fluidity is lost, and the time required for maintaining the fluidity necessary for the work after the kneading is maintained. It's short. In order to solve this drawback, a set retarder is used to extend the pot life. For example, JP-A-50-1742.
8 is an example. According to Japanese Patent Application Laid-Open No. 50-17428, a hydraulic cement composition containing a calcium aluminate-based mineral as a rapid hardening component is used, and at least one selected from tartaric acid and its alkali salt as a setting retarder and a potassium salt of carbonic acid. A method for controlling the setting of rapid hardening cement by adding and is disclosed.

[0006]

However, in the quick-hardening composition containing these conventional calcium aluminate-based minerals as the rapid-hardening component, the calcium aluminate-based mineral is the one described in JP-A-50-17428. As disclosed in the examples, 12CaO.7Al ₂ O ₃ clinker ground product, and as disclosed in the examples of JP-A-48-10244, quicklime (purity 94.0%) 4
White bauxite (purity 86.7%) 53.8 in 6.2 parts
A homogeneous composition with few impurities is used, such as a product obtained by blending parts and melting this mixture at high temperature (1560 ° C.). In this case, in order to obtain 12CaO.7Al ₂ O ₃ clinker, etc., it is necessary to perform firing for a long time at 1350 to 1450 ° C. or higher, and thus a dedicated furnace is required.
It consumes a large amount of energy at high cost, is disadvantageous in cost, and is limited in use when special construction or urgent need is required. The result was that the acquisition of energy-saving, inexpensive calcium aluminate was an issue.

As a result of intensive studies to solve the above-mentioned conventional problems, the present invention produces a large amount of by-products, particularly when aluminum is used in the deoxidizing step of the stainless steel smelting process. It was found that the produced metallurgical slag had properties effective as a raw material for a quick-hardening composition, and was completed as a method for producing a fast-hardening composition. That is, the present invention is based on 100 parts by weight of Portland cement or mixed cement, 10 to 70 parts by weight of finely powdered stainless steel slag which is a by-product of a steelmaking furnace, and 4 to 40 type II anhydrous gypsum.
When a composition having a composition of 0.5 to 5 parts by weight of a settling agent comprising a mixture of parts by weight and an organic setting retarder and an alkali carbonate is mixed under a certain condition, a pot life as a fast hardening composition is obtained. Is long and can be adjusted freely, the hardening after setting is rapid, the strength rapidly increases, the penetration power into cracks and voids in the formation is large, and it is also suitable for concrete pouring work. It was completed by finding out.

A further object of the present invention is to provide a method for producing a fast-curing composition which is free from the risk of groundwater contamination and has a relatively sufficient strength. Further, the present invention does not require a dedicated furnace for high-temperature firing, and effectively uses waste slag that has not been used as industrial waste at all as a source of calcium aluminate as the fast-hardening component. It is an object to provide a method for producing a composition.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems. For 100 parts by weight of Portland cement or mixed cement, a deoxidation step in a stainless steel smelting process. 10 to 70 parts by weight of stainless steel slag by-produced by using aluminum, 4 to 40 parts by weight of type II anhydrous gypsum, and 0.5 to 5 parts by weight of a settling agent consisting of an organic set retarder and an alkali carbonate. A method for producing a fast-curing composition, which comprises mixing and pulverizing.
The present invention also claims claims 2, 3, and 4. The stainless steel slag contains 50% by weight or more of the calcium aluminate compound, which is mainly 12CaO · 7Al ₂ O ₃ , as described later. Also, the setting regulators are citric acid, tartaric acid,
Gluconic acid or a salt thereof is a combination of an organic setting retarder, which is one kind or a mixture of two or more kinds, and an alkali carbonate, and a mixing ratio thereof is 1 part by weight of the organic setting retarder. The alkali is preferably in the range of 0.5 to 7 parts by weight. The stainless steel slag used preferably has a brain value of 2000 to 4000 cm ² / g.

[0010]

In the present specification, the "stainless steel slag" is a "metallurgical slag that appears in the reduction period during the production of stainless steel, and in particular, silicon is used as a deoxidizing agent in the steel during the production of high quality stainless steel. High-alumina-containing stainless steel slag that is a byproduct of using aluminum instead of aluminum, that is, a stainless steel slag that is by-produced by using aluminum in the deoxidation step of the stainless steel smelting process. It contains 12CaO.7Al ₂ O ₃ (that is, C ₁₂ A ₇ ) as a main component, and also contains MgO, SiO _{2, and the} like. Most of the current steelmaking process is gradually cooled (the waste slag is left to cool in the ladle), so crystalline 12CaO · 7Al ₂ O ₃ (C ₁₂ A
₇ ) is the main component. Since crystalline C ₁₂ A ₇ has a remarkable reactivity immediately after contact with water and has a non-uniform crystallinity as compared with a C ₁₂ A ₇ clinker fired in a baking furnace, it has not been conducted conventionally as described below. It requires a unique blending process and is not a simple substitute for the expensive calcium aluminate clinker of the known composition in the past with an inexpensive stainless steel slag.

The stainless steel slag contains a large amount of CaO and Al ₂ O ₃ in the chemical composition, as shown below, and shows its potential as a raw material for a rapid hardening composition. However, this possibility also depends on the blending ratio of the present invention,
Unless compounded by the process of the present invention, it cannot be used as a raw material of an effective and useful fast-curing composition.

First, the properties of this stainless steel slag will be clarified, and the compounding step and compounding ratio according to the present invention will be described later.

This stainless steel slag is, for example, shown in Table 1 below.
As a result of chemical analysis, it was clarified that the composition ratio was as follows.

[0014]

[Table 1]

Therefore, this stainless steel slag is CaO
And Al ₂ O ₃ as main components, and also contains MgO and SiO. Further, according to the X-ray diffraction analysis of this stainless steel slag, the main constituent mineral was C ₁₂ A ₇ [calcium aluminate (12CaO · 7Al ₂ O ₃ )], and other C
aO.Al ₂ O ₃ and MgO are found.

Next, the step of blending the rapid hardening composition from this stainless steel slag according to the present invention will be described. This stainless steel slag is pulverized alone for homogenization so as to have a specific surface area of at least 2000 to 4000 cm ² / g.
Then, other type II anhydrous gypsum or the like is subjected to a step of mixing and pulverizing the finely powdered stainless steel slag, and the resulting fine powder mixture is mixed with Portland cement or mixed cement and a settling agent to obtain a fast-hardening composition. The thing is obtained.

Alternatively, stainless steel slag together with a coagulation modifier has a specific surface area of at least 2000-4000 cm ^2.
/ G, and then add type II anhydrous gypsum to the resulting finely powdered stainless steel slag mixture, and further add a specific surface area of 30
Grind to 00-6000 cm ² / g. (It is needless to say that a stainless steel slag may be simultaneously mixed and crushed with a setting modifier and type II anhydrous gypsum as a simple rapid synthesizing method.) To the obtained fine powder mixture, Portland cement or mixed cement is added to obtain a rapid hardening composition. The thing is obtained.

The reason for limiting the steps in this way is that the stainless steel slag, which is a rapid hardening component used in the present invention, is heterogeneous, unlike the calcium aluminate clinker that is fired in a conventional dedicated furnace, and is therefore locally localized. As a result of different pulverizability and hydration reactivity, if stainless steel slag is homogenized by mixing and pulverizing with type II anhydrous gypsum or setting modifier in advance and not mixing with cement, abnormal expansion etc. will occur and reproducibility It is difficult to secure a good setting time.

[0019] To further elaborate on this point, in general, slowly cooled C ₁₂ A ₇ is faster in the very initial hydration as compared with the rapidly cooled calcium aluminate clinker. Therefore, when utilizing the stainless steel slag of the present invention, by mixing and pulverizing the finely pulverized stainless steel slag with the type II anhydrous gypsum and the setting modifier, the stainless steel slag becomes fine particles and the anhydrous gypsum and the setting adjuster. It is probable that the homogenization was carried out as a rapid-hardening component by coating with the cement component, and after the process of obtaining such a homogenized and mixed pulverized product, it was mixed with the cement component to rapidly increase the viscosity immediately after contact with water. The hydration reaction can be adjusted appropriately and controlled. That is, the most significant feature of the production method of the present invention is to provide a step of homogenizing the stainless steel slag before mixing with the cement component.

The type II anhydrous gypsum used in the fast-curing composition of the present invention can be obtained as a by-product in the production of hydrofluoric acid, a calcined product of gypsum dihydrate, etc., and when the by-product in the production of hydrofluoric acid is used. It will be very cost effective.

The compounding ratio of the fast-curing composition according to the present invention is
Fine powder stainless steel slag powder; 10 to 70 parts by weight, Type II anhydrous gypsum; 4 to 40 parts by weight, and 100 to parts by weight of Portland cement or mixed cement, and a setting regulator consisting of an organic setting retarder and alkali carbonate; 0 The compounding ratio is 0.5 to 5 parts by weight.

When the fast-curing composition of the present invention is kneaded with water and, if necessary, water and an aggregate,
Maintains fluidity during kneading and then rapidly cures. This is suitable for maintaining a fluid state during a pouring operation while a certain fluidity is required, and rapidly hardening at the end of the pouring operation to sufficiently fulfill the function as a fast hardening material. It is a thing.

In using the fast-curing composition of the present invention,
The time at which the obtained slurry starts to cure can be adjusted by adjusting the amount of the coagulation modifier added, and the fluidity of the obtained slurry can be adjusted by adjusting the amount of water or aggregate. It is possible.

The method for producing the fast-curing composition of the present invention is applicable only in the case where Portland cement or mixed cement, finely ground stainless steel slag, and mixed pulverized product of type II anhydrous gypsum and a setting modifier are mixed in advance before use. However, when kneading at the time of use, cement components, stainless steel slag and II
It also includes the case where the finely ground product of the anhydrous gypsum type and the setting modifier are separately mixed. It also includes the case where the coagulation modifier is added together with water during kneading during use.
Further, when mixing and pulverizing the stainless steel slag and the coagulation modifier, only a part of the coagulation modifier is added, and the remaining amount is added during the kneading at the time of use to adjust the coagulation time. .

As described above, by mixing the Portland cement or the mixed cement with the finely ground stainless steel slag containing calcium aluminate and the type II anhydrous gypsum mixed pulverized product, at the initial stage of hydration, Hydration reaction between calcium hydroxide and calcium aluminate produces calcium aluminate hydrate, and further hydration reaction between this calcium aluminate hydrate and type II anhydrous gypsum results in needle-like ettringite and monohydrate crystals. Sulfate (3CaO ・ Al ₂ O ₃・ CaSO ₄・ 12
H ₂ O) is generated and hardened rapidly, and the initial strength is expressed.
Further, in the long term, calcium silicate in Portland cement or mixed cement contributes to the development of strength.

If the mixing ratio of the finely powdered stainless steel slag to Portland cement or mixed cement is large, the hardening of the slurry will be quick, and if it is small, the strength of the hardened product will be low.
The range of 10 to 70 parts by weight is suitable for the stainless steel slag with respect to 0 parts by weight.

If the proportion of type II anhydrous gypsum is large, ettringite will be excessively formed, and the hardened body will expand, and if it is small, the strength will decrease. Therefore, the compounding amount of the type II anhydrous gypsum is preferably in the range of 4 to 40 parts by weight with respect to 100 parts by weight of Portland cement or mixed cement.

If the amount of the setting modifier is large, the setting time will be long and the hardening of the slurry will be slow, and if it is small, the hardening of the slurry will be rapid, so 100 parts by weight of Portland cement or mixed cement will be added. On the other hand, the range of 0.5 to 5 parts by weight is preferable.

Fineness of finely pulverized stainless steel slag: If the brane value is high, the slurry is rapidly hardened, resulting in
When the value is low, the strength of the cured product is low, so that the value is preferably in the range of 2000 to 4000 cm ² / g.

The fast-curing composition of the present invention can further adjust the setting start time, and the change range of fluidity can be adjusted according to the pot life. These can be realized by adjusting the compounding amounts of the finely powdered stainless steel slag and the coagulation modifier.

The fast-curing composition obtained by the present invention is a finely powdered stainless steel slag powder; 10 to 70 parts by weight, based on 100 parts by weight of Portland cement or mixed cement.
Type II anhydrous gypsum; 4 to 40 parts by weight and a setting regulator consisting of an organic setting retarder and an alkali carbonate; 0.5 to 5 parts by weight.

This is because the slurry obtained when the finely powdered stainless steel slag is in a proportion of 10 parts by weight or less with respect to 100 parts by weight of Portland cement or mixed cement.
However, the strength development in the order of several hours deteriorates. And
It is considered that the effect is greatest in the range of 30 to 70 parts by weight. If it is 70 parts by weight or more, the long-term strength of the obtained cured product will be reduced.

The content ratio by weight of type II anhydrous gypsum is 100 parts by weight of Portland cement or mixed cement.
It is in the range of 4 to 40 parts by weight. The addition of type II anhydrous gypsum is indispensable to develop the initial strength by ettringite, and this amount is closely related to the addition amount of stainless steel slag. When the stainless steel slag is 10 parts by weight with respect to 100 parts by weight of Portland cement or mixed cement, the amount of type II anhydrous gypsum is about 4 parts by weight, and if the amount is less than that, it will be insufficient. Also, stainless steel slag is 5 parts with respect to 100 parts by weight of Portland cement or mixed cement.
When the amount is 0 parts by weight, the amount of type II anhydrous gypsum is about 25 parts by weight, and when the amount is more than this, there is a concern that the hardened body may swell due to excessive ethrin guide formation for a long period.

It is desirable that the finely powdered stainless steel slag contains 50% by weight or more of a calcium aluminate compound, and the calcium aluminate compound is mainly 12CaO.7Al ₂ O ₃ . Further, the setting regulator is composed of citric acid, tartaric acid, gluconic acid, or an organic setting retarder which is one or a mixture of two or more kinds of these salts, and alkali carbonate, and the mixing ratio thereof is organic setting. Delay agent 1
It is preferable that the ratio of the alkali carbonate is 0.5 to 7 parts by weight with respect to parts by weight.

When only an organic type retarder is added as a setting regulator, the time required for curing can be prolonged, but since the setting and curing proceed continuously, the fluidity also decreases with time, and the slurry The workability is also lost quickly, and the ability to penetrate cracks in roads and voids in the formation is small. However, in the fast-curing composition of the present invention, alkali carbonate is added to the setting regulator and used. That is, with only an organic setting retarder, if the addition amount is large, the reaction becomes remarkably slow and only the curing is delayed, but if alkali carbonate is added to the setting regulator, after the fluidity continues for a certain time, A phenomenon of rapid curing is observed, and in the fast-curing composition according to the present invention, the slurry obtained exhibits fast-curing property and a rapid increase in strength, which is convenient for the applications described above.

The alkali carbonate used as the coagulation modifier in the fast-curing composition of the present invention may be either sodium carbonate or potassium carbonate, but sodium carbonate is preferred in terms of cost.

The combination of the alkali carbonate and the organic setting retarder in the mixture of the setting regulator according to the present invention and the mixing ratio are as shown in FIGS. 1 and 2, the rapid hardening composition and water or water. And the fluidity with aggregates. Therefore,
Alkali carbonate is 1 part by weight of the organic setting retarder,
A range of 0.5 to 7 parts by weight is suitable.

Next, the method for producing the fast-acting composition of the present invention will be specifically described with reference to Examples, but the present invention is not limited thereto.

The materials used in this example are shown below. Cement Normal Portland cement Type II anhydrous gypsum Blaine value of 5,000c
Grinded to m ² / g Finely powdered stainless steel slag A stainless steel slag with the composition ratio shown in Table 1 has a brain value of 25.
Milled to 00,3000,3500 cm ² / g Coagulation regulator Tartaric acid, citric acid, sodium citrate, gluconic acid, sodium carbonate

[0040]

Example 1 100 parts by weight of ordinary cement were mixed with 28 parts by weight of finely powdered stainless steel slag crushed to a brain value of 3000 cm ² / g and 12 parts by weight of type II anhydrous gypsum,
Further, 1.1 parts by weight of a coagulation modifier consisting of tartaric acid and sodium carbonate was added and mixed to obtain a fast-curing composition. Various fast-curing compositions were prepared while changing the mixing ratio in the setting regulator, and kneaded with water, and the fluidity of the obtained slurry was measured immediately after the kneading and 10 minutes after the kneading. The results are shown in the graph of FIG. The fluidity of the slurry was measured by the P-Rot method specified in Japan Society of Civil Engineers standards.

In the graph of FIG. 1, the vertical axis represents the flow-down time (second) measured by the P-rot method, and the horizontal axis represents the mixing ratio of tartaric acid and sodium carbonate. The dotted line shows the flow down time immediately after kneading, and the solid line shows the flow down time after 20 minutes of kneading. The amount of water used for kneading the fast-curing composition was 50 parts by weight with respect to 100 parts by weight of the fast-curing composition.

[0042]

Example 2 100 parts by weight of ordinary cement were mixed with 28 parts by weight of finely powdered stainless steel slag crushed to a brain value of 3000 cm ² / g and 12 parts by weight of type II anhydrous gypsum,
Further, each part by weight of a setting regulator having a mixing ratio of tartaric acid and sodium carbonate of 1: 4 was added and mixed to obtain a fast-curing composition.

Each fast-curing composition was kneaded with water, and then the change in fluidity was examined. The experimental conditions are the same as in Example 1. For comparison, a tartaric acid-free compounding example excluding sodium carbonate was used as a setting modifier (Comparative Example 1), a commercially available ultra-fast cement was used as a quick-setting material, and 0.3 weight% of citric acid was used as a setting agent. %, The change in fluidity after kneading with water was also examined. The experimental conditions in Comparative Example 2 were 60 parts by weight of kneading water, because 50 parts by weight of kneading water had too poor fluidity with respect to 100 parts by weight of the fast-curing composition. The measurement results are shown in the graph of FIG. The vertical axis shows the flow-down time, and the horizontal axis shows the elapsed time from kneading.

[0044]

Example 3 The fast-curing composition according to the present invention having the composition of each example shown in Table 2 and the compositions shown in Comparatives 3, 4, and 5 were each kneaded with water, and the obtained slurry was subjected to a coagulation test and curing. A compressive strength test of the body was performed. Table 3 shows the results. In Examples 1 to 7, finely powdered stainless steel slag having a brain value of 3000 cm ² / g was used, and the setting regulator was a ratio of 1 tartaric acid to 4 sodium carbonate, and Example 8 was a blade.
Using a fine powdered stainless steel slag with a value of 2500 cm ² / g,
In Example 9, fine powder stainless steel slag having a brain value of 3500 cm ² / g was used, and the coagulation modifier was the same as in Examples 1 to 7. In Example 10, a finely powdered stainless steel slag having a brain value of 3000 cm ² / g was used, and a mixture of sodium citrate (1) and sodium carbonate (4) was used as a setting modifier. Example 11 also has a brain value of 3000 cm ^2.
/ G of finely powdered stainless steel slag and a mixture of 1 gluconic acid and 4 sodium carbonate as a coagulation modifier.

[0045]

[Table 2]

[0046]

[Table 3]

Further, in Comparative Example 3 mentioned for comparison, a finely powdered stainless steel slag having a brain value of 3000 cm ² / g was used, and a tartaric acid-only one was used as a coagulation modifier. 0.3% citric acid in ultra-fast cement
% By weight. The condensation test is based on JIS
It was carried out according to the method specified in the physical testing method for cement of R5201, and the starting time is shown in the table. The compressive strength test was carried out by packing the kneaded slurry in a 4 × 4 × 16 cm mold and molding it according to the method specified in JIS R5201 according to a prescribed material age. In both the setting test and the compressive strength test, the amount of kneading water was 50 with respect to 100 parts by weight of the fast-curing composition.
It was carried out in parts by weight.

In the fast-curing composition of the present invention, as shown in FIG. 1, sodium carbonate; that is, alkali carbonate, is added to tartaric acid, which is an organic setting retarder as a setting regulator, so that the rapid setting immediately after kneading. It is clear that sex is alleviated. In addition, as shown in FIG. 2, after the kneading, the fast-curing composition of the present invention maintains a fluid state for a certain period,
After that, it solidifies rapidly. On the other hand, the cured compositions shown in Comparative Examples 1 and 2 of Example 2 lose fluidity immediately after kneading. As shown in Table 2 of Example 3, the fast-curing composition of the present invention is set within a certain period of time after kneading, and then the strength thereof is rapidly increased to reach practical strength at an early stage. Further, the setting time, that is, the working time can be adjusted by changing the addition amount of the finely powdered stainless steel slag or the addition amount of the setting modifier.

[0049]

As described above, according to the method for producing a fast-acting composition of the present invention, the above effects are obtained.
Summarizing them, the following remarkable technical effects are obtained. That is, the fast-curing composition produced by the method of the present invention,
Portland cement or mixed cement, finely powdered stainless steel slag obtained by crushing slag of a steelmaking furnace, type II anhydrous gypsum and an organic setting retarder and alkali carbonate as a setting modifier,
By mixing and grinding according to the method of the present invention,
After kneading with water, unlike conventional fast-curing materials, it maintains good fluidity for a certain period of time, that is, it has a long pot life and then hardens rapidly, so cracks in roads, formations, etc. It excels in penetrating into the voids and is most suitable for urgent construction work. Also, at the secondary product factory,
The fluidity is maintained for the time required for the casting operation, and the strength is increased in a short period of time, so that the rotation rate of the form can be increased.

Secondly, as described above, the stainless steel slag produced as a by-product in the steelmaking and refining process which has been conventionally used only as a landfill material is used, and a rapid hardening composition which does not require a new dedicated firing furnace is used. It is now possible to manufacture a product, thirdly, it is possible to supply a large amount of a low-cost fast-curing composition, and fourth, as compared with currently commercially available fast-curing cements. Also has a relatively good initial strength, and can provide a quick-hardening composition that can respond immediately to water-stopping work and other civil engineering work that requires sufficient urgency, and it is relatively inexpensive in large quantities. The technical effects such as being able to provide stably were obtained.

[Brief description of drawings]

FIG. 1 is a graph showing the change in fluidity when the mixing ratio of the fast-curing composition according to the present invention in the setting regulator is changed.

FIG. 2 is a graph comparing changes in fluidity of the fast-curing composition of the present invention and a conventional composition.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area // (C04B 28/02 (C04B 28/02 7:19 7:19 22:14 22:14 B 22:10 22:10 24:06) 24:06) A (72) Inventor Takeshi Kono 2270 Yokose, Yokose-cho, Chichibu-gun, Saitama Prefecture, Central Research Laboratory, Mitsubishi Mining and Cement Co., Ltd. (72) Toshiyuki Nakamura Saitama Prefecture 2270 Yokose, Yokoze-cho, Chichibu-gun, Central Research Laboratory, Mitsubishi Mining Cement Co., Ltd.

Claims (7)

(57) [Claims] 1. A quick-hardening composition in which a calcium aluminate compound, type II anhydrous gypsum, an organic setting retarder and a setting modifier consisting of an alkali carbonate are mixed and pulverized with Portland cement or a mixed cement as a main component. In the manufacturing method, instead of the calcium aluminate compound, a stainless steel slag (hereinafter referred to as a stainless steel slag), which is a by-product of using aluminum in the deoxidizing step of the stainless steel smelting process, is used, and Portland cement or mixed cement 100 is used. 10 to 70 parts by weight of the stainless steel slag, 4 to 40 parts by weight of type II anhydrous gypsum, and 0.5 to 5 parts by weight of a setting regulator composed of an organic setting retarder and an alkali carbonate are mixed and pulverized with respect to parts by weight. A method for producing a fast-curing composition, comprising: 2. Production of a fast-curing composition in which calcium aluminate compound, type II anhydrous gypsum, an organic setting retarder and a setting regulator consisting of an alkali carbonate are mixed with Portland cement or a mixed cement as a main component. In the method, a stainless steel slag is used in place of the calcium aluminate compound, and the stainless steel slag alone has a specific surface area of 2000.
A step of finely pulverizing to 4,000 cm ² / g, a step of mixing the finely pulverized material with type II anhydrous gypsum and a pulverizing step, a step of mixing Portland cement or a mixed cement with the mixed pulverized material, A process for producing a fast-curing composition, further comprising the step of adding and mixing an organic setting retarder and a setting control agent comprising an alkali carbonate to the mixture to obtain a fast-curing composition. 3. Production of a fast-curing composition by mixing Portland cement or mixed cement, which is the main component, with a calcium aluminate compound, type II anhydrous gypsum, and an organic setting retarder and a setting regulator consisting of an alkali carbonate. In the method, a stainless steel slag is used in place of the calcium aluminate compound, and the stainless steel slag has a specific surface area of 20 while adding an organic setting retarder and a settling agent consisting of an alkali carbonate.
A step of finely pulverizing the finely ground product to a size of 0 to 4000 cm ² / g;
000 to 6000 cm ² / g, and a step of mixing and pulverizing the mixture, and a step of mixing Portland cement or mixed cement with the mixed pulverized product to obtain a quick-hardening composition. . 4. Production of a fast-curing composition by mixing calcium aluminate compound, type II anhydrous gypsum, an organic setting retarder and a setting modifier consisting of an alkali carbonate with Portland cement or a mixed cement as a main component. In the method, in place of the calcium aluminate compound, using a stainless steel slag, the stainless steel slag, a step of mixing and finely pulverizing with an organic setting retarder and a setting regulator consisting of alkali carbonate and type II anhydrous gypsum, A method for producing a fast-curing composition, which comprises mixing Portland cement or mixed cement with the mixed finely pulverized product to obtain a fast-curing composition. 5. The stainless steel slag is mainly 12
The method for producing a fast-curing composition according to any one of claims 1 to 4, which contains 50% by weight or more of a calcium aluminate compound which is CaO · 7Al ₂ O ₃ . 6. The set modifier is a combination of an organic set retarder and an alkali carbonate, which is one or a mixture of two or more of citric acid, tartaric acid, gluconic acid or salts thereof. The mixing ratio is such that the alkali carbonate is in the range of 0.5 to 7 parts by weight with respect to 1 part by weight of the organic setting retarder, and the rapid hardening composition according to any one of claims 1 to 4. Manufacturing method. 7. The stainless steel slag has a brain value in the range of 2000 to 4000 cm ² / g.
A method for producing the fast-curing composition according to any one of 1.