KR102328281B1 - Mixture Material Composition for Steam Curing Concrete for 2 Cycle-Daily and Method of Maufacturing Concrete Product Using Thereof - Google Patents

Abstract

The present invention relates to a mixture material composition for steam curing for 2 cycle per day which comprises, based on 100 parts by weight of desulfurized gypsum, 30 to 80 parts by weight of blast furnace slag powder, 20 to 70 parts by weight of microsilica, 10 to 20 parts by weight of incineration ash, 10 to 20 parts by weight of dust, and 20 to 30 parts by weight of fly ash; and a method for manufacturing a concrete product using the same. A mixture material composition for steam curing for 2 cycle per day according to the present invention has good sulfation resistance, improves crack strength, contributes to reduction of carbon dioxide emission, has excellent initial strength and long-term strength expression, and has high chemical resistance and freeze-thaw resistance.

Description

Mixture Material Composition for Steam Curing Concrete for 2 Cycle-Daily and Method of Maufacturing Concrete Product Using Thereof

The present invention relates to a mixture composition for steam curing 2 cycles per day and a method for manufacturing the same for a concrete product, and more particularly, to reduce the generation of carbon dioxide by reducing the amount of cement used for manufacturing concrete, and to reduce the amount of energy used during firing. It relates to a mixture composition for steam curing 2 cycles per day that can reduce the amount and a method for manufacturing a concrete product using the same.

In general, a product that is poured into a mold and molded into a product of a certain shape is called precast concrete or concrete secondary product. There are blocks, adoblocks, interlocking blocks, PC segments, railroad sleepers, plumes and bench pools, as well as various other products.

When manufacturing such secondary concrete products, since the price of the molding mold is high, early demolding of the mold is an essential condition for improving productivity and reducing investment cost.

Therefore, conventional secondary concrete products are demolded about 24 hours after forming by increasing the unit cement amount and steam curing in order to obtain high strength at an early stage.

On the other hand, if we look at the manufacturing process of cement, it consumes a lot of fuel because it is manufactured by mining limestone, iron ore, and clay, which are the main raw materials, and calcining it at a high temperature of 1,450℃. It causes fatal harm to the atmospheric environment.

In particular, while various types of efforts (adopted in 1997, and the Kyoto Protocol, which came into effect in 2005, ended in 2012) are in progress worldwide to prevent global warming, in December 2015, They jointly confirmed the Paris Agreement, which proposes various measures to protect it. Accordingly, there is a need to significantly reduce the emission of greenhouse gases such as carbon dioxide worldwide.

The cement industry emits about 0.9 tons of carbon dioxide to produce 1 ton of cement, which is the basis for manufacturing concrete.

Although some mixed blast furnace slag and fly ash with cement are widely applied to concrete at home and abroad, there is a limit to remarkably reducing carbon dioxide in this way. Therefore, various methods are being studied to overcome the above limitations.

For example, research on alkali-activated binders with improved strength performance by mixing blast furnace slag or fly ash as a partial substitute for cement and using an alkali activator is being actively conducted at home and abroad.

However, cementless alkali activated binders used as substitutes for cement are mainly related to cementless alkali activated concrete using sodium silicate as an activator. It is known that the field applicability is low due to the tendency of disappearance and rapid freezing, and the increase in manufacturing cost is caused.

In addition, in Korea Patents 10-0855686 and 10-1014869, and academic papers of the Korean Concrete Society, crushed blast furnace slag or fly ash is used alone or in combination, and alkali activators such as liquid NaOH and KOH with high alkalinity are used to cement cement. Methods for making mortars and concrete are disclosed.

However, cementless mortar and concrete by this method show environmental damage due to the strong high alkali property by the alkali activator, and it is difficult to use in a dry state such as dry cement mortar due to the water absorption ability of strong alkali, wet ready-mix Even when used in concrete, there is a problem that it is difficult to use it universally, such as a separate facility equipment is required for adding a strong alkali agent.

In addition, Republic of Korea Patent No. 10-1488147 discloses a low-temperature calcined cementitious binder composition, which is calcined at a temperature lower than the manufacturing conditions of general cement produced at a calcination temperature of 1,450 ° C. to replace the cement material, or to activate the reaction of blast furnace crushed slag. A method for doing so is disclosed. However, this technology has the disadvantage that the initial hydration characteristics of the milled blast furnace slag do not show physical properties equal to or higher than that of general cement, and the range of its use is extremely limited.

In addition, since steam-cured concrete with one cycle per day has a low strength of about 10 to 15%, there is a problem with low physical properties such as strength and elasticity.

Therefore, there is a demand for the development of low-carbon binders or cement replacement materials that can contribute to improving the oxidation resistance of steam-cured concrete, improving crack strength of steam-cured concrete products, and reducing carbon dioxide emissions.

Republic of Korea Patent Publication No. 10-0362087 (2002.11.23.) Republic of Korea Patent Publication No. 10-1085044 (2011.11.18)

The present invention was created to solve the above problems, and by providing a steam curing mixture composition for 2 cycles per day, it improves the oxidation resistance of concrete, improves crack strength, and contributes to reduction of carbon dioxide emission, An object of the present invention is to provide a steam-cured concrete composition having excellent strength and long-term strength expression, high chemical resistance and freeze-thaw resistance, and a method for manufacturing a concrete product using the same.

the present invention

Based on 100 parts by weight of desulfurized gypsum,

30 to 80 parts by weight of blast furnace slag powder;

20 to 70 parts by weight of microsilica;

10 to 20 parts by weight of incineration ash;

10 to 20 parts by weight of dust; and

It provides a mixture composition for steam curing two cycles per day comprising 20 to 30 parts by weight of fly ash.

Also, the present invention

Based on 100 parts by weight of cement and desulfurized gypsum, 30 to 80 parts by weight of blast furnace slag powder, 20 to 70 parts by weight of microsilica, 10 to 20 parts by weight of incineration ash, 10 to 20 parts by weight of dust, and 20 to 30 parts by weight of fly ash A mixing step of mixing a mixture composition for steam curing and silica sand in a weight ratio of 7: 2 to 4: 20 to 35;

After the mixing step is completed, the first steam curing step of steam curing at a temperature of 60 to 70 ℃ for 25 to 35 minutes in a mold;

a second steam curing step of steam curing at a temperature of 60 to 70° C. for 3 to 5 hours after the first steam curing step is completed; and

It provides a method for manufacturing a concrete product using a mixture composition for steam curing two cycles per day, including a demolding step of demolding after the second steam curing step is completed.

The mixture composition for steam curing with 2 cycles per day according to the present invention has good sulfation resistance of steam-cured concrete, improves crack strength, contributes to reduction of carbon dioxide emission, and has excellent initial strength and long-term strength expression, and chemical resistance And there is an effect of high freeze-thaw resistance.

Hereinafter, the present invention will be specifically described.

In one aspect, the present invention is based on 100 parts by weight of desulfurized gypsum, 30 to 80 parts by weight of blast furnace slag powder; 20 to 70 parts by weight of microsilica; 10 to 20 parts by weight of incineration ash; 10 to 20 parts by weight of dust; And it provides a mixture composition for 2 cycles per day steam curing comprising 20 to 30 parts by weight of fly ash.

In another aspect, the present invention is based on 100 parts by weight of cement and desulfurized gypsum, 30 to 80 parts by weight of blast furnace slag powder, 20 to 70 parts by weight of microsilica, 10 to 20 parts by weight of incineration ash, 10 to 20 parts by weight of dust, and ply A mixing step of mixing a mixture composition for steam curing containing 20 to 30 parts by weight of ash and silica sand in a weight ratio of 7: 2 to 4: 20 to 35; After the mixing step is completed, the first steam curing step of steam curing at a temperature of 60 to 70 ℃ for 25 to 35 minutes in a mold; a second steam curing step of steam curing at a temperature of 60 to 70° C. for 3 to 5 hours after the first steam curing step is completed; and a demolding step of demolding after the second steam curing step is completed.

The mixture composition for two-cycle steam curing per day according to the present invention is for preparing concrete by steam curing by mixing with cement, silica sand, etc., especially if it is a conventional mixture composition for steam curing for one-day two-cycles in the art having this purpose not limited

Desulfurized gypsum constituting the mixture composition for steam curing 2 cycles per day according to the present invention produces eringite in the initial stage of steam curing hydration.

Here, the eringite reduces the shrinkage of concrete by generating a strong expansion pressure, and performs a function of improving the crack strength of steam-cured concrete by densifying the crystalline structure inside the concrete.

Preferred desulfurization gypsum fluidized bed the boiler sulfuric acid ash ion (SO _3), the Et-ring if it is included in the under like, and ions (SO ₃₎ is 25% by weight of the sulfuric acid to be used that contained from 25 to 40% by weight It is undesirable in that the amount of zite produced decreases, and when it exceeds 40 wt%, it is not preferable in that the formation of ettringite is excessive and may cause expansion cracks.

The content of the remaining components other than the desulfurized gypsum constituting the mixture composition for steam curing for 2 cycles per day according to the present invention is based on 100 parts by weight of the desulfurized gypsum.

The blast furnace slag powder according to the present invention is intended to improve fluidity while excluding the elution of harmful substances and to have sufficient compressive and flexural strength. Any conventional blast furnace slag powder in the art for this purpose can be used fineness is also supposed mubang but like is 3,700 to 4,000cm ² / g, preferably from about 3,850cm ² / g, and the density is 2.9 to 3.5g / cm ^3, preferably from about 3.1g / cm ³ of the blast furnace It is better to use slag fine powder.

The preferred amount of the blast furnace slag powder used is not particularly limited, but it is recommended that it be 30 to 80 parts by weight based on 100 parts by weight of the desulfurized gypsum.

Since the microsilica according to the present invention has a large specific surface area and can use a high content, water tightness is remarkably improved by filling micropores existing in concrete, thereby improving compressive strength and the like.

Preferred microsilica has higher requirements than general silica fume, and it _{is recommended that the content of silicon dioxide (SiO 2} ) in the constituent components be 95 wt% or more, and the specific surface area is 200,000 cm2/g or more, or both.

Here, the specific surface area of 200,000 cm2/g or more does not mean that the specific surface area of some of the particles is 200,000 cm2/g, but the lower limit of the specific surface area of the particles included through the additional process is 200,000 cm2/g within the manufacturing error range. means g.

In particular, in the case of the microsilica of the present invention, when the content of silicon dioxide (SiO ₂ ) among the components is 95% by weight or more, the secondary hydration reactivity (pozzolan reaction) is faster as well as the microsilica compared to the conventional silica fume. The hydration reaction is promoted by setting the specific surface area of 200,000 cm2/g or more.

Therefore, the microsilica of the present invention has improved secondary hydration reactivity compared to general silica fume due to an increase in the silicon dioxide content, or because the hydration reaction is promoted due to an increase in specific surface area, the content is increased compared to general silica fume for a long-term While improving the compressive strength, it can satisfy the compressive strength at 4 hours of age (based on the cement at the initial velocity: 21 MPa) or the compressive strength at the age of 24 hours (the criterion of the cement at the rate of initial velocity: 21 MPa).

The preferred amount of microsilica used is not particularly limited, but it is recommended that it be 20 to 70 parts by weight based on 100 parts by weight of desulfurized gypsum.

As the incineration ash according to the present invention, any conventional incineration ash in the art may be used, but preferably paper incineration ash, which is a by-product generated in the process of incinerating sludge and peel (bark) generated in a paper mill, is used. it's good

At this time, the incinerated paper ashes are made of incinerated ashes with a high calcium oxide content in the incineration process of the paper mill, and the calcium oxide reacts with moisture to become calcium hydroxide, thereby reducing the moisture content through absorption and heat generation. to provide.

Incineration ashes according to the present invention, specifically, in consideration of workability and economic feasibility, it is recommended to use 10 to 20 parts by weight based on 100 parts by weight of desulfurized gypsum.

The dust according to the present invention may be any dust conventional in the art, but it is preferable to use paper dust, which is a by-product generated in a paper mill.

Here, the paper dust provides a high exothermic temperature and absorption ability when in contact with moisture by free-CaO and FeO components containing a large amount, and has a heating temperature higher than fly ash, which is used as a raw material of the mixed material composition due to the large amount of the CaO component contained. Higher and better absorbency.

It is preferred that the preferred dust, in particular the paper dust, has a specific surface area of 2,000 to 9,000/g. When the specific surface area is less than 2,000/g, the activity is low due to insufficient fine particles, so the effect of reducing the moisture content during solidification is reduced. Equipment operability is reduced.

The preferred amount of dust used is not particularly limited, but it is recommended that it be 10 to 20 parts by weight based on 100 parts by weight of desulfurized gypsum.

Fly ash according to the present invention means coal ash collected by a dust collector from flue gas of a boiler burning pulverized coal, and has a spherical particle size about the same as that of cement, and alumina and silica are the main components.

Specifically, fly ash according to the present invention can use pulverized fly ash, the pulverized fly ash provides improved strength and/or fluidity than using unpulverized fly ash. .

At this time, the fineness of the pulverized fly ash according to the present invention is 3,500 to 4,500 cm ² /g, preferably 3,500 to 3,800 cm ² /g, more preferably 3,700 cm ² /g is less than, the density is 1.5 to 2.8 g/cm ³ , preferably about 2.2 g/cm ³ .

It is recommended that the preferred amount of fly ash used is 20 to 30 parts by weight based on 100 parts by weight of desulfurized gypsum.

The mixture composition for one-day two-cycle steam curing according to the present invention may further include one or more additives which are implemented in the following specific embodiments.

As a specific embodiment, the mixture composition for steam curing for 2 cycles per day according to the present invention is 3 to 20 parts by weight based on 100 parts by weight of desulfurized gypsum in order to provide shrinkage compensation, high strength, for example, high compressive strength, flexural strength, and rapid hardening. It may further include a minor calcium sulfoaluminate (Calcium Sulfo Aluminate).

Here, the calcium sulfoaluminate reacts instantaneously when in contact with water to generate Ettringite hydrate, so that the compressive strength of the steam curing mixture composition can be obtained within minutes to hours.

In this case, ultra-fine amorphous calcium sulfoaluminate may be used for a more rapid hydration reaction.

The fineness of the ultrafine amorphous calcium sulfoaluminate used to increase the hydration reactivity is preferably about 5,000 to 8,000 cm 2 /g.

Specifically, the calcium sulfoaluminate according to the present invention is composed to contain 28 to 62% by weight of rolled finished sludge, 19 to 52% by weight of dolomite sludge, and 9 to 20% by weight of by-product gypsum, and the mixture The particle size of 88㎛, the remainder may be made by pulverizing 5 to 20% by weight.

Thereafter, the mixture is maintained at a calcination temperature of 1,000 to 1,300° C. for at least 1 hour in a calcination furnace and then air-cooled to prepare calcium sulfoaluminate. At this time, when the calcination temperature is low or the content of dolomite sludge is high, the amount of unreacted lime increases and exhibits expandability, so there is a risk of collapse and destruction. Production is low and the intended purpose cannot be achieved.

As another specific aspect, the mixture composition for steam curing 2 cycles per day according to the present invention provides tensile strength and/or lightness due to stress applied in the longitudinal-transverse direction, and 100 weight of desulfurized gypsum to prevent shrinkage cracking It may further include 1 to 10 parts by weight of natural cellulose fibers based on parts.

As another specific embodiment, the mixture composition for 2 cycle steam curing per day according to the present invention further comprises 5 to 15 parts by weight of silicon dioxide based on 100 parts by weight of desulfurized gypsum in order to impart uniform dispersibility, durability and weather resistance of the composition. can do.

Here, when the amount of silicon dioxide added is less than 5 parts by weight based on 100 parts by weight of desulfurized gypsum, it is difficult to maintain durability, and when it exceeds 15 parts by weight, the hydration reactivity is excessive and the physical properties are reduced, so it is preferable to be limited to the above range .

As another specific aspect, the mixture composition for 2 cycle steam curing per day according to the present invention is made by adding sodium bentonite in an amount of 1 to 10 parts by weight based on 100 parts by weight of desulfurized gypsum to make pores dense, prevent leakage, and improve strength. may include

The sodium bentonite absorbs a large amount of water, expands to several times its original volume, becomes a gel-like state, and densely fills the pores of the composition, thereby preventing leakage and improving strength, thereby contributing to crack prevention.

As another specific aspect, the mixture composition for steam curing for 2 cycles per day according to the present invention improves the water repellency of the composition, for example, the surface slip property to improve the water repellency so that contaminants including moisture do not easily attach dimethylpolysiloxane. It may further include 1 to 5 parts by weight based on 100 parts by weight of desulfurized gypsum.

As another specific embodiment, the mixture composition for 2 cycle steam curing per day according to the present invention may further include 2 to 6 parts by weight of dibutyl phthalate based on 100 parts by weight of desulfurized gypsum to prevent cracking and peeling of the composition. .

As another specific embodiment, the mixture composition for 1 day 2 cycle steam curing according to the present invention contains 3-mercaptopropyltrimethoxysilane based on 100 parts by weight of desulfurized gypsum in order to improve the strength, penetration, and water repellency of the composition. It may further include 1 to 3 parts by weight.

As another specific embodiment, the mixture composition for 2 cycle steam curing per day according to the present invention may further include 1 to 3 parts by weight of gelite fine powder based on 100 parts by weight of desulfurized gypsum in order to improve long-term strength and durability of the composition. There, the gelite is a mineral material having an effect of 187 times or more of that of loess, and in addition to the above effect, it also has a high-quality far-infrared emitting effect, and a preferable average particle size is 1 to 5 μm.

As another specific embodiment, the mixture composition for 2 cycles per day steam curing according to the present invention may further include 1 to 5 parts by weight of sodium fluoride based on 100 parts by weight of desulfurized gypsum in order to improve the filling properties and durability of the composition. There, sodium fluoride primarily serves as a filler, but secondarily serves to improve durability, and the effect can be obtained in the content range as described above.

As another specific embodiment, the mixture composition for 1 day 2 cycle steam curing according to the present invention may further include 1 to 5 parts by weight of sodium metasilicate based on 100 parts by weight of desulfurized gypsum in order to improve the compressive strength and flexural strength of the composition. However, if the content is less than 1 part by weight, fluidity is lowered and irregular bubbles are formed, and if it exceeds 5 parts by weight, it is difficult to secure curing time, which is not good.

As another specific embodiment, the mixture composition for two-cycle steam curing per day according to the present invention may further include 5 to 15 parts by weight of tetraethyl orthosilicate based on 100 parts by weight of desulfurized gypsum in order to improve the initial strength expression of the composition. .

Here, the tetraethyl orthosilicate can improve the adhesion performance due to good affinity, and has a property of penetrating into the concrete, so that the effect can be further exhibited.

As another specific embodiment, the mixture composition for 2 cycle steam curing per day according to the present invention is 0.1 to 10 parts by weight based on 100 parts by weight of desulfurized gypsum in order to improve abrasion resistance, chemical resistance, solvent resistance, heat resistance and/or water resistance. It may further include furfuryl alcohol.

As another specific embodiment, the mixture composition for steam curing for 2 cycles per day according to the present invention may further include 1 to 10 parts by weight of lithium carbonate based on 100 parts by weight of desulfurized gypsum in order to improve the curing rate.

Here, in the lithium carbonate, the lithium salt, aluminum, which is a component in cement, reacts with lithium ions eluted from the lithium salt to generate lithium aluminate, thereby improving fast hardening properties. This curing acceleration reaction by lithium salt is different from the simple curing phenomenon of cement, and a remarkable quick-setting effect is expressed.

As another specific embodiment, the mixture composition for steam curing for 2 cycles per day according to the present invention works with cement to increase cohesiveness and increase the reaction rate of cement to improve early strength, based on 1 to 10 parts by weight of desulfurized gypsum. It may further include aluminum sulfate in parts by weight.

As another specific embodiment, the mixture composition for steam curing for 2 cycles per day according to the present invention is 1 to 10 parts by weight of calcium silicate hydrate (CSH, representative composition C _{3 based on 100 parts by weight of desulfurized gypsum to help harden the blast furnace slag powder)} S ₂ H ₃ ) may be further included.

Here, in the calcium silicate hydrate, when the acid film of the blast furnace slag powder is destroyed and a dissolution reaction occurs from the surface of the fine slag powder, an insoluble material is precipitated in the blast furnace slag powder and hardening can be accelerated.

As another specific embodiment, the mixture composition for steam curing for 2 cycles per day according to the present invention works with cement to increase cohesiveness and increase the reaction rate of cement to improve early strength, based on 1 to 10 parts by weight of desulfurized gypsum. Calcium ferrite may be further included in parts by weight.

Here, the calcium ferrite compound reacts with calcium carbonate in limestone to produce a carboferrite compound, thereby densifying the internal structure of concrete.

The densification of the internal tissue prevents penetration of sulfate bacteria, induces death of sulfate bacteria, and stabilizes sulfate ions, thereby remarkably improving the resistance to oxidation corrosion of steam cured concrete.

As a preferred calcium ferrite compound, it is recommended to use a calcium ferrite compound discharged from a steelworks smelting process.

As another specific aspect, in order to prevent a situation in which mixing becomes difficult due to a rapid hydration reaction when mixing materials, the mixture composition for 1 day 2 cycle steam curing according to the present invention contains 1 to 5 parts by weight based on 100 parts by weight of desulfurized gypsum. It may further include citric acid.

As another specific embodiment, the mixture composition for 2 cycle steam curing per day according to the present invention contains 5 to 10 parts by weight of ethylene vinyl acetate desulfurized gypsum based on 100 parts by weight of desulfurized gypsum in order to reinforce the moisture separability and water resistance and impact resistance of the composition. It may further include parts by weight.

As another specific embodiment, the mixture composition for steam curing for 2 cycles per day according to the present invention is 1 to 5 parts by weight of light dolomite powder based on 100 parts by weight of desulfurized gypsum in order to improve the exothermicity of the steam curing mixture composition for steam curing. may further include.

As another specific aspect, the mixture composition for 1 day 2 cycle steam curing according to the present invention forms a polymer film inside the composition to improve the compressive strength, flexural strength and adhesion strength of the composition, and durability due to the polymer film film inside the composition 1 to 5 parts by weight of a styrene-butadiene resin based on 100 parts by weight of desulfurized gypsum in order to be enhanced.

As another specific embodiment, the mixture composition for 2 cycle steam curing per day according to the present invention may further include 1 to 5 parts by weight of sepiolite based on 100 parts by weight of desulfurized gypsum in order to improve the viscosity and material separation resistance of the composition. can

As another specific aspect, the mixture composition for 1 day 2 cycle steam curing according to the present invention is 1 to 5 parts by weight of gamma-aminopropyl tree based on 100 parts by weight of desulfurized gypsum in order to improve the deterioration prevention, durability, and curability of the composition. It may further include ethoxysilane.

As another specific embodiment, the mixture composition for steam curing for 2 cycles per day according to the present invention is 1 to 5 parts by weight of acetylated lath based on 100 parts by weight of desulfurized gypsum in order to improve the heat resistance, flame resistance and adhesion of the composition. It may contain more nolans.

A method of manufacturing a concrete product using the mixture composition for steam curing 2 cycles per day according to the present invention having such a configuration will be described as follows.

Here, the 2 cycle steam curing mixture composition per day is usually mixed with materials such as cement and/or silica sand and put in a mold to steam curing, so that concrete, specifically Hume tube, VR tube, electric pole, manhole block, hoan block, It is manufactured from concrete products such as ecological blocks, fishing blocks, interlocking blocks, PC segments, railway sleepers, plumes and bench pools.

Accordingly, in order to more easily explain the present invention, it is as follows.

The method for manufacturing a concrete product using the mixture composition for steam curing 2 cycles per day according to the present invention is based on 100 parts by weight of cement and desulfurized gypsum, 30 to 80 parts by weight of blast furnace slag powder, 20 to 70 parts by weight of microsilica, 10 parts by weight of incineration ash to 20 parts by weight, 10 to 20 parts by weight of dust, and a mixture composition for steam curing containing 20 to 30 parts by weight of fly ash and silica sand 7: 2 to 4: mixing step of mixing in a weight ratio of 20 to 35;

After the mixing step is completed, the first steam curing step of steam curing at a temperature of 60 to 70 ℃ for 25 to 35 minutes in a mold;

a second steam curing step of steam curing at a temperature of 60 to 70° C. for 3 to 5 hours after the first steam curing step is completed; and

and a demolding step of demolding after the second steam curing step is finished.

Here, the cement is not particularly limited as long as it is a cement commonly used in the art, but preferably, a special cement such as general Portland cement or blast furnace slag cement, ultrafine powder cement, and super fast cement can be used.

The preferred fineness of the cement is 3,200 to 6,500 cm ² /g.

In addition, the silica sand according to the present invention is not particularly limited as long as it uses silica sand commonly used in the art, but it is preferable to use silica sand No. 4 and/or silica sand No. 6.

Hereinafter, the present invention will be described in detail through examples. However, the following examples are only for describing the present invention in detail and do not limit the scope of the present invention by these examples.

[Example 1]

100 g of desulfurized gypsum, ^{55 g of fine blast furnace slag powder with a fineness of about 3,850 cm 2} /g and a density of about 3.1 g/cm ³ , a silicon dioxide content of at least 95% by weight or more, and a specific surface area of about 230,000 cm 2 /g 45 g of silica, 15 g of incinerated paper, 15 g of paper dust, and ^{25 g of pulverized fly ash having a fineness of about 3,600 cm 2} /g and a density of about 2.2 g/cm ³ A mixture composition for steam curing 2 cycles per day was prepared.

[Example 2]

100 g of desulfurized gypsum, ^{37.5 g of fine blast furnace slag powder having a fineness of about 3,850 cm 2} /g and a density of about 3.1 g/cm ³ , a silicon dioxide content of at least 95 wt%, and a specific surface area of about 230,000 cm 2 /g 62.5 g of microsilica, 12.5 g of incinerated paper, 12.5 g of paper dust, and 25 g of pulverized fly ash having a fineness ^{of about 3,600 cm 2} /g and a density of about 2.2 g/cm ^{3 are mixed to steam 2 cycles per day} A curing mixture composition was prepared.

[Example 3]

100 g of desulfurized gypsum, ^{75 g of fine blast furnace slag powder with a fineness of about 3,850 cm 2} /g and a density of about 3.1 g/cm ³ , a silicon dioxide content of at least 95% by weight and a specific surface area of about 230,000 cm 2 /g 25g of silica, 12.5g of incinerated paper, 12.5g of paper dust, and 25g of pulverized fly ash having a fineness ^{of about 3,600cm 2} /g and a density of about 2.2g/cm ^{3 for steam curing 2 cycles per day} A mixture composition was prepared.

[Example 4]

It was carried out in the same manner as in Example 1, except that 15 g of ultra-fine amorphous calcium sulfoaluminate having a particle fineness of about 6,000 cm 2 /g was further added.

[Example 5]

It was carried out in the same manner as in Example 1, except that 5 g of natural cellulose fibers were further added.

[Example 6]

It was carried out in the same manner as in Example 1, except that 10 g of silicon dioxide was further added.

[Example 7]

It was carried out in the same manner as in Example 1, except that 5 g of sodium bentonite was further added.

[Example 8]

It was carried out in the same manner as in Example 1, except that 3 g of dimethylpolysiloxane was further added.

[Example 9]

It was carried out in the same manner as in Example 1, except that 3 g of dibutyl phthalate was further added.

[Example 10]

It was carried out in the same manner as in Example 1, except that 2 g of 3-mercaptopropyltrimethoxysilane was further added.

[Example 11]

It was carried out in the same manner as in Example 1, except that 2 g of fine gelite powder having an average particle size of 3 μm was further added.

[Example 12]

It was carried out in the same manner as in Example 1, except that 4 g of sodium fluoride was further added.

[Example 13]

It was carried out in the same manner as in Example 1, except that 4 g of sodium metasilicate was further added.

[Example 14]

It was carried out in the same manner as in Example 1, except that 10 g of tetraethyl orthosilicate was further added.

[Example 15]

It was carried out in the same manner as in Example 1, except that 5 g of furfuryl alcohol was further added.

[Example 16]

It was carried out in the same manner as in Example 1, except that 5 g of lithium carbonate was further added.

[Example 17]

It was carried out in the same manner as in Example 1, except that 5 g of aluminum sulfate was further added.

[Example 18]

It was carried out in the same manner as in Example 1, but calcium silicate hydrate (C ₃ S ₂ H ₃ ) 5g was further added.

[Example 19]

It was carried out in the same manner as in Example 1, except that 5 g of calcium ferrite was further added.

[Example 20]

It was carried out in the same manner as in Example 1, except that 3 g of citric acid was further added.

[Example 21]

It was carried out in the same manner as in Example 1, except that 6 g of ethylene vinyl acetate was further added.

[Example 22]

It was carried out in the same manner as in Example 1, except that 3 g of light dolomite powder was further added.

[Example 23]

It was carried out in the same manner as in Example 1, except that 3 g of a styrene-butadiene resin was further added.

[Example 24]

It was carried out in the same manner as in Example 1, except that 3 g of sepiolite was further added.

[Example 25]

It was carried out in the same manner as in Example 1, except that 2 g of gamma-aminopropyltriethoxysilane was further added.

[Example 26]

It was carried out in the same manner as in Example 1, except that 4 g of acetylated ranolan was further added.

[Example 27]

It was carried out in the same manner as in Example 1, except that all additives added to Examples 4 to 26 were added.

[Comparative example]

Instead of the steam curing mixture composition of Example 1, Portland cement was used.

[Experiment]

180 g of the compositions prepared according to Examples and Comparative Examples, ^{420 g of Portland cement having a fineness of about 4,500 cm 2} /g, 600 g of silica sand No. 4, and 600 g of silica sand No. 6 were mixed to prepare a mixture.

Then, the mixture was put into a mold and first steam cured at a temperature of about 65° C. for about 30 minutes.

Then, after the first steam curing, the second steam curing was carried out at a temperature of about 65° C. for about 4 periods.

Then, after the second steam curing is finished, demolding is performed to manufacture the final concrete product, and the demolding strength and compressive strength (1 day, 3 days (underwater curing), 7 days (underwater curing)) are measured and the results are shown. 1 is indicated.

Demolding strength (MPa) Compressive strength (MPa) 1 day 3 days (underwater curing) 7 days (underwater curing) Example 1 15.5 23.9 27.4 30.5 Example 2 16.3 25.2 28.6 37.0 Example 3 15.5 23.8 27.1 30.4 Example 4 16.3 25.4 28.6 38.1 Example 5 14.8 23.7 27.3 31.5 Example 6 15.1 25.4 27.8 34.6 Example 7 15.5 23.9 27.6 32.3 Example 8 16.4 24.1 28.2 37.1 Example 9 15.3 24.9 27.6 32.1 Example 10 16.4 24.8 28.6 38.1 Example 11 16.1 23.7 27.3 31.2 Example 12 16.3 24.1 27.4 32.4 Example 13 14.8 23.8 28.3 35.5 Example 14 15.3 24.8 27.1 35.1 Example 15 14.8 24.3 27.3 33.3 Example 16 15.2 24.1 28.5 38.2 Example 17 15.3 23.9 27.1 31.3 Example 18 16.2 24.2 28.1 37.3 Example 19 16.1 24.1 27.3 32.3 Example 20 15.8 23.8 27.3 37.3 Example 21 16.8 23.8 27.3 30.5 Example 22 16.1 25.4 27.6 37.4 Example 23 14.9 23.7 27.4 31.3 Example 24 15.2 24.4 27.3 34.3 Example 25 16.1 23.9 28.1 34.5 Example 26 15.3 24.9 27.7 37.2 Example 27 16.3 24.8 28.1 37.3 comparative example 13.5 21.9 25.8 28.8

As shown in Table 1, it can be confirmed that the demoulding strength and compressive strength of concrete using the mixture composition for steam curing with 2 cycles per day prepared according to the Examples sufficiently satisfies the demoulding strength and compressive strength required for concrete products. there was.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that all of the embodiments described above are illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention, rather than the above detailed description, all changes or modifications derived from the meaning and scope of the claims to be described later and their equivalents.

Claims (5)

Based on 100 parts by weight of desulfurized gypsum,
30 to 80 parts by weight of blast furnace slag powder;
20 to 70 parts by weight of microsilica;
10 to 20 parts by weight of incinerated paper;
10 to 20 parts by weight of dust; and
In a mixture composition for two-cycle steam curing a day comprising 20 to 30 parts by weight of fly ash, which is a coal ash collected by a dust collector from the flue gas of a boiler burning pulverized coal,
Further comprising 1 to 10 parts by weight of natural cellulose fibers based on 100 parts by weight of desulfurized gypsum,
It further comprises 1 to 10 parts by weight of sodium bentonite based on 100 parts by weight of desulfurized gypsum,
Further comprising 1 to 5 parts by weight of dimethylpolysiloxane based on 100 parts by weight of desulfurized gypsum,
It further comprises 2 to 6 parts by weight of dibutyl phthalate based on 100 parts by weight of desulfurized gypsum,
3-mercaptopropyltrimethoxysilane is further included in an amount of 1 to 3 parts by weight based on 100 parts by weight of desulfurized gypsum,
It further comprises 1 to 5 parts by weight of sodium fluoride based on 100 parts by weight of desulfurized gypsum,
Further comprising 1 to 5 parts by weight of sodium metasilicate based on 100 parts by weight of desulfurized gypsum,
Furfuryl alcohol is further included in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of desulfurized gypsum,
Further comprising 1 to 5 parts by weight of styrene-butadiene resin based on 100 parts by weight of desulfurized gypsum,
It further comprises 1 to 5 parts by weight of sepiolite based on 100 parts by weight of desulfurized gypsum,
Further comprising 1 to 5 parts by weight of gamma-aminopropyltriethoxysilane based on 100 parts by weight of desulfurized gypsum,
A mixture composition for 2 cycles per day steam curing further comprising 1 to 5 parts by weight of acetylated lanolan based on 100 parts by weight of desulfurized gypsum.
delete delete delete Based on 100 parts by weight of cement and desulfurized gypsum, 30 to 80 parts by weight of blast furnace slag powder, 20 to 70 parts by weight of microsilica, 10 to 20 parts by weight of incinerated paper, 10 to 20 parts by weight of dust, and the flue of a boiler burning pulverized coal In the steam curing mixture composition comprising 20 to 30 parts by weight of fly ash, which is a coal ash collected from gas by a dust collector, 1 to 10 parts by weight of natural cellulose fibers are further included based on 100 parts by weight of desulfurized gypsum, and sodium bentonite is desulfurized gypsum 100 It further includes 1 to 10 parts by weight based on parts by weight, further includes 1 to 5 parts by weight of dimethylpolysiloxane based on 100 parts by weight of desulfurized gypsum, and further includes 2 to 6 parts by weight of dibutyl phthalate based on 100 parts by weight of desulfurized gypsum. And, 3-mercaptopropyltrimethoxysilane further comprises 1 to 3 parts by weight based on 100 parts by weight of desulfurized gypsum, and further comprises 1 to 5 parts by weight of sodium fluoride based on 100 parts by weight of desulfurized gypsum, metasilicic acid It further comprises 1 to 5 parts by weight of sodium based on 100 parts by weight of desulfurized gypsum, further comprises 0.1 to 10 parts by weight of furfuryl alcohol based on 100 parts by weight of desulfurized gypsum, and styrene-butadiene resin based on 100 parts by weight of desulfurized gypsum. 1 to 5 parts by weight, further comprising 1 to 5 parts by weight of sepiolite based on 100 parts by weight of desulfurized gypsum, and 1 to 5 parts by weight of gamma-aminopropyltriethoxysilane based on 100 parts by weight of desulfurized gypsum Mixing step of mixing the mixture composition for steam curing further comprising 1 to 5 parts by weight of acetylated lanolan in an amount of 1 to 5 parts by weight based on 100 parts by weight of desulfurized gypsum and silica sand in a weight ratio of 7: 2 to 4: 20 to 35. ;
After the mixing step is completed, the first steam curing step of steam curing at a temperature of 60 to 70 ℃ for 25 to 35 minutes in a mold;
a second steam curing step of steam curing at a temperature of 60 to 70° C. for 3 to 5 hours after the first steam curing step is completed; and
A method of manufacturing a concrete product using a mixture composition for steam curing 2 cycles per day, comprising a demolding step of demolding after the second steam curing step is completed.