KR102082911B1 - Artificial light weight aggregates composition using cement zero binder and manufacturing method thereof - Google Patents

Abstract

Disclosed is a non-plastic artificial lightweight aggregate composition using a cement cement binder and a method for manufacturing the same. More specifically, the lightweight material, cement cement binder, thickener and water, and the light material, cement cement binder and thickener Mixing step of producing a mixture, molding step of mixing water to the mixture prepared through the mixture manufacturing step to form a granular, curing step of curing the molded product formed by the molding step with steam and curing through the curing step It is prepared through a drying step of drying the molding.
The artificial light weight aggregate manufactured by the composition and method is simple in manufacturing process and low in manufacturing cost, and is excellent in light weight, heat insulation, non-combustibility and mechanical properties. It shows the effect of improving workability and the like.

Description

Non-plastic artificial lightweight aggregate composition using cement binder and its manufacturing method {ARTIFICIAL LIGHT WEIGHT AGGREGATES COMPOSITION USING CEMENT ZERO BINDER AND MANUFACTURING METHOD THEREOF}

Disclosed is a non-plastic artificial lightweight aggregate composition using a cement cement binder and a method for manufacturing the same. More specifically, the manufacturing process is simple, low manufacturing cost, and lightweight, thermal insulation, non-combustible and excellent mechanical properties B) When applied to ready-mixed concrete, non-plastic artificial lightweight aggregate composition using cementless binder having an effect of improving cost reduction, light weight, workability and workability, and a manufacturing method thereof.

Fly ash (Fly ash, Bottom ash, landfill ash) generates about 820 million tons annually in 10 domestic thermal power plants, of which about 6.2 million tons are used as cement substitutes, and about 2 million tons are landfilled in nearby landfills. . Therefore, about 75% of the entire coal ash is recycled. Coal ash discharged from thermal power plants is classified into fly ash and bottom ash according to its properties.Fly ash is finely recycled because of its fine particle size and excellent composition, but among them, it has a high carbon content and a large particle size. What is not recycled is called reject ash, which is almost always disposed of by landfilling.

Recently, the recycling of coal ash is being actively progressed, and research into high value-added artificial light weight aggregates has been progressed beyond simple cement admixtures, and the application to light weight boards and heat resistant blocks is being developed. When manufacturing the artificial lightweight aggregate, a direct firing method is used in which the aggregate is directly injected into a furnace heated to a predetermined temperature in order to make a ceramic support surrounded by pores inside and surrounded by glass. The artificial light aggregate thus prepared is lighter than existing natural aggregates and can be floated in water, so that it can be applied to pollution and harmful algae removal devices of marine and cage farms.

Until now, in the method of manufacturing lightweight aggregate using fly ash and batem ash, satisfactory physical properties can be obtained only through a calcination process performed at a high temperature of about 1000 ° C to 1200 ° C. In order to secure the energy required for the firing process, it is necessary to increase the operation of thermal power generation, etc., which leads to a contradictory situation in which it becomes unfriendly.

Korean Patent Publication No. 10-2013-0111105 (2013.10.10). Korea Patent Registration No. 10-1418642 (2014.07.04).

Disclosed is a simple manufacturing process, low manufacturing cost, light weight, heat insulation, non-combustibility and mechanical properties are ignored in the case of applying to concrete or ready-mixed concrete to reduce the cost, light weight, workability and workability It relates to a non-plastic artificial lightweight aggregate composition using a cement binder and a method of manufacturing the same.

As one example, the contents of this disclosure describe a non-plastic artificial lightweight aggregate composition using a cementless binder characterized in that it consists of a lightweight material, cementite binder, thickener and water.

Preferably, the non-plastic artificial lightweight aggregate composition using the cementless binder may be composed of 100 parts by weight of the lightweight material, 100 to 230 parts by weight of cement binder, 0.1 to 0.3 parts by weight of thickener and 25 to 35 parts by weight of water.

More preferably, the lightweight material may be made of one or more selected from the group consisting of pearlite, vermiculite and bottom ash.

More preferably, the cement binder is 100 parts by weight of fly ash, 2.2 to 5.2 parts by weight of lime, 1.2 to 3.2 parts by weight of anhydrous gypsum, 2.5 to 6.5 parts by weight of blast furnace slag powder, 0.5 to 2.2 parts by weight of magnesium chloride and 3.3 parts of sodium carbonate. To 5.3 parts by weight.

As another example embodiment of the present disclosure is a molding step of mixing a lightweight material, cement cement binder and a thickener, a molding step of mixing the water produced in the mixture produced by the mixture manufacturing step to form a granule, the molding A method for producing a non-plastic artificial lightweight aggregate composition using a cement cement binder, characterized in that it comprises a curing step of curing the molding molded through the step and a drying step of drying the cured molding through the curing step Doing.

Preferably, the molding step is to put the disk into the disc-shaped granulator with a rotating screen having a 45 to 55 degree inclination from the vertical while mixing water by spraying the mixture prepared by the mixture manufacturing step and the disk 10 to 30 rpm By rotating for 10 to 20 minutes at a rate of may be made of a process of forming into granules.

More preferably, the curing step is steam curing the molded article formed through the molding step for 2 hours at a temperature of 35 to 45 ℃, steam curing for 2 hours at a temperature of 55 to 65 ℃, 85 to 95 Steam curing for 10 hours at a temperature of ℃.

The non-plastic artificial lightweight aggregate composition using the cementless binder as described above and its manufacturing method have a simple manufacturing process and low manufacturing cost, and are excellent in light weight, heat insulation, non-combustibility, and mechanical properties, so that it can be applied to concrete or ready-mixed concrete. It has an excellent effect of providing non-plastic artificial lightweight aggregate using cement binder which improves saving, light weight, workability and workability.

Figure 1 is a flow chart illustrating a method of manufacturing a non-plastic artificial lightweight aggregate composition using the disclosed cement cement binder.
Figure 2 is a photograph showing the process of molding the mixture into a granular shape using a disk-shaped granulator.
Figure 3 is a photograph showing the non-plastic artificial lightweight aggregate composition using the cement cement binder prepared in Example 1.

In the following, preferred embodiments of the present invention and the physical properties of each component will be described in detail, which is intended to explain in detail enough to be able to easily carry out the invention by one of ordinary skill in the art, This does not mean that the technical spirit and scope of the present invention is limited.

Non-plastic artificial lightweight aggregate composition using the disclosed cement binder is composed of a light weight material, cement binder, thickener and water, 100 parts by weight of light weight material, 100 to 230 parts by weight binder, 0.1 to 0.3 parts by weight thickener and It is preferable that it consists of 25-35 weight part of water.

The light weight material is a main material of the non-plastic artificial lightweight aggregate composition using the disclosed cementless binder, and serves to give light weight to the artificial lightweight aggregate composition, one selected from the group consisting of pearlite, vermiculite and bottom ash. It is more preferably made of 3 to 5 parts by weight of pearlite or vermiculite and 95 to 97 parts by weight of bottom ash.

The cement binder contains 100 to 230 parts by weight, 100 parts by weight of fly ash, 2.2 to 5.2 parts by weight of calcined lime, 1.2 to 3.2 parts by weight of anhydrous gypsum, 2.5 to 6.5 parts by weight of blast furnace slag powder, 0.5 to 2.2 parts by weight of magnesium chloride And 3.3 to 5.3 parts by weight of sodium carbonate, wherein the fly ash and blast furnace slag powder containing the pozzolanic mineral component are composed of the pearlite, vermiculite and bottom ash components constituting the lightweight material, ionic aggregation reaction of lime and chloride, pozzolanic reaction and blast furnace slag. Through a latent hydraulic reaction of the serves to ensure a predetermined strength without the firing process.

More specifically, the cemented binder composed of the above components produces a large amount of ettringite among the components, the chemical composition of which is 3CaO.Al ₂ O ₃ 3CaSO ₄ 32H ₂ O. It takes water as binding water to promote the reaction and at the same time controls the movement of particles of light weight material to facilitate solidification. Hydrate is generated by calcium hydroxide, so that light weight materials such as pearlite, vermiculite and bottom ash The solidification of the particles is further increased, and components such as SiO ₂ and Al ₂ O ₃ contained in pearlite, vermiculite, and bottom ash form calcium hydroxide and hydrate to activate pozzolane to promote curing.

In addition, the fly ash (fly ash) is a fine powder by-product injected into the suspended air at a high temperature of 1500 ± 200 ℃ by injecting pulverized coal into a hot air in the furnace at high speed in a thermal power plant, etc., the particles are light It is a fly that is scattered and collected by a dust collector. The generation rate of fly ash is about 13 to 48% of the raw coal, the specific gravity is 1.35, and the powder degree (cm 2 / g) is about 5600 to 8500.

The calcined lime is an alkaline imparting stimulant for hydration reaction of blast furnace slag and can rapidly destroy the inner particle film generated by contact with water within the numerical range of the present application, so that the initial compressive strength due to the acceleration of the hydration reaction will be increased Can be. The chemical composition of the slaked lime of the present application is shown in Table 1 below.

TABLE 1

In addition, the anhydrous gypsum is generally used gypsum and slag and slaked lime when reacted with water to react with water ettringite (3CaO, Al ₂ O ₃ , 3CaSO ₄ , 32H ₂ O) hydration reaction ( As the tissue is densified due to the water absorption effect and the filling of the pores of the fine particles, the initial strength increases and it promotes hydration.The blast furnace slag that promotes long-term strength and anhydrous gypsum and slaked lime that enhance the initial strength are combined in an appropriate ratio. By constructing, the effect of considerable strength improvement can be brought.

The chemical composition of the anhydrite is shown in Table 2 below.

TABLE 2

In addition, the blast furnace slag fine powder is a finely divided by drying and pulverizing the granulated crushed slag obtained by quenching the molten slag produced with pig iron in the blast furnace, there is a potential hydrophobic, the reactivity of the blast furnace slag generally has a basicity and vitrification rate The higher the value is, the specific gravity is in the range of 2.90 to 2.94, and the specificity of the powder is 4,000 to 6,000 cm 2 / g. The use of blast furnace slag powder increases the surface activity and accelerates the dissolution rate of Al ₂ O ₃ , thereby promoting the formation of ettringite, promoting the gelation of CSH hydrates, and reducing the unreacted portion. have.

The chemical composition of the blast furnace slag fine powder is shown in Table 3 below.

TABLE 3

The quicklime is commercially available as a white powder, commercially available CaO content of 80% or more, the particle size is 200mesh 90% or more, ions as a stimulant to improve the strength through the bonding of the lightweight material and promote the potential hydraulic properties It serves to carry out flocculation and pozzolanic reactions.

The magnesium chloride (MgCl ₂ ) is a white powder pH of 5.0 to 7.0, serves to give an initial strength and solidify the disclosed light weight aggregate composition.

In addition, the sodium carbonate (Na2CO3) is a soda ash strong hygroscopicity of the white powder, the specific gravity is 2.5, the purity is 99%, it is used as a stimulator of the blast furnace slag powder.

The thickener contains 0.1 to 0.3 parts by weight, and maintains the viscosity of the mixture of the light weight material and the cementless binder to improve the efficiency of the molding process in the molding step, made of starch or cellulose It is preferable.

In addition, the method for producing a non-plastic artificial lightweight aggregate composition using the disclosed cementless binder is a mixture manufacturing step (S101) of mixing a lightweight material, cementless binder and a thickener, to the mixture prepared through the mixture manufacturing step (S101) Molding step (S103) of mixing the water to form a granule, curing step (S105) for curing the molded article formed through the molding step (S103) and drying the cured molding through the curing step (S105) It consists of a drying step (S107).

The mixture production step (S101) is a step of mixing the light weight material, cement cement binder and thickener, 100 parts by weight of the lightweight material, 100 to 230 parts by weight binder, 0.1 to 0.3 parts by weight thickener and water 25 to 35 It is made by mixing parts by weight, after separately preparing the light weight material and the cement binder, the prepared light weight material, cement binder and the thickener and water are added to a stirrer and 3 to 5 minutes at a speed of 100 to 150 rpm. Stirring is achieved through a process of dry mixing.

In this case, the effects of the light weight material, the cement binder and the thickener are the same as the contents described in the non-plastic artificial lightweight aggregate composition using the cement cement, the description thereof will be omitted.

The molding step (S103) is a step of molding the mixture produced through the mixture manufacturing step (S101) to form a granular shape, mixing the water prepared by the mixture manufacturing step (S101) by spraying method While being put into a disk-shaped granulator equipped with a rotating screen having a slope of 45 to 55 degrees from the vertical, and rotating the disk for 10 to 20 minutes at a speed of 10 to 30rpm consists of forming a granular shape.

The curing step (S105) is a step of curing the molded article formed through the molding step (S103) with steam, steam curing the molded article formed through the molding step (S103) for 2 hours at a temperature of 35 to 45 ℃ After steam curing for 2 hours at a temperature of 55 to 65 ℃, steam curing for 10 hours at a temperature of 85 to 95 ℃.

After the curing step (S105) consisting of the above process, the strength of the molded article formed through the molding step (S103) is improved, shrinkage is lowered.

The drying step (S107) is a step of drying the cured molding through the curing step (S105), after drying the cured molding through the curing step (S105) to a drying chamber to dry for 2 to 3 days at room temperature It's a step.

After the drying step (S107), the preparation of the non-plastic artificial lightweight aggregate composition using the disclosed cement cement binder is completed.

Hereinafter, the physical properties of the artificial lightweight aggregate manufactured by the method for producing a non-plastic artificial lightweight aggregate composition using the disclosed cement binder and the manufacturing method will be described with reference to Examples.

Production Example 1 Manufacture of Lightweight Material

2.5 parts by weight of pearlite, 2.5 parts by weight of vermiculite, and 95 parts by weight of bottom ash were added to a stirrer and stirred at a speed of 80 rpm for 5 minutes to prepare a lightweight material.

Preparation Example 2 Preparation of Cementless Binder

100 parts by weight of fly ash powder containing pozzolanic mineral, 4 parts by weight of slaked lime, 2.5 parts by weight of anhydrous gypsum, 5 parts by weight of blast furnace slag powder, 1.0 parts by weight of magnesium chloride and 4.5 parts by weight of sodium carbonate in a stirrer and 10 minutes at a speed of 150 rpm. Stirred during to prepare the cement binder.

<Example 1>

30 kg of the lightweight material prepared in Preparation Example 1, 70 kg of the cement cement binder prepared in Preparation Example 2, and 0.2 kg of a thickener (starch) were added to an agitator, and stirred at a speed of 150 rpm for 10 minutes to prepare a mixture. , The prepared mixture is molded in the form of granules by injecting 37.5L of water into the stirrer using a circular plate granulator. The speed was 20 rpm, the mixture was added while rotating the disk for 10 minutes, and then the granulated molding having a particle size of 25 mm or less was prepared by rotating the disk while spraying water. Steam curing at 60 ° C for 2 hours and 90 ° C for 10 hours, and the cured molding is transferred to a drying chamber for natural drying at room temperature for 36 hours. To prepare a non-plastic artificial lightweight aggregate using cement cement binder.

<Example 2>

Proceed in the same manner as in Example 1, using a cement cement binder using 40kg light weight material prepared in Preparation Example 1, 60kg cement cement binder prepared in Preparation Example 2, 0.2kg thickener (starch) Non-plastic artificial lightweight aggregate was prepared.

<Example 3>

Proceed in the same manner as in Example 1, using 50kg light-weight material prepared in Preparation Example 1, 50kg of cement cement binder prepared in Preparation Example 2, using 0.2kg cement thickener (starch) using Non-plastic artificial lightweight aggregate was prepared.

Comparative Example 1

Proceed in the same manner as in Example 1, but using a cement cement binder using 10kg light weight material prepared in Preparation Example 1, 90kg cement cement binder prepared in Preparation Example 2, 0.2kg thickener (starch) Plastic artificial lightweight aggregate was prepared.

Comparative Example 2

Proceed in the same manner as in Example 1, using 70kg light-weight material prepared in Preparation Example 1, using a cement cement binder 30kg, a thickener (starch) 0.2kg prepared using Preparation Example 2 Artificial lightweight aggregate was prepared.

The compressive strength, specific gravity, and water absorption of the non-plastic artificial lightweight aggregate using the cementless binder prepared through Examples 1 to 3 and Comparative Examples 1 to 2 are shown in Table 4 below.

(However, the measurement of the physical properties using the measurement method of structural lightweight aggregate KS F 2534, the measurement age is 28 days.)

TABLE 4

As shown in Table 4 above, the non-plastic artificial light weight aggregate using the cemented binder prepared in Examples 1 to 3 disclosed is an ion agglomeration reaction, a pozzolanic reaction and a fly ash, blast furnace slag fine powder between the lightweight material and the cemented binder. It can be seen that the compressive strength is greater than 18 (MPa), which is the KS standard, through the latent hydraulic reaction of.

On the other hand, non-plastic artificial lightweight aggregate using cement cement binders prepared through Comparative Examples 1 to 2 has a high specific gravity when the content of cement cement binder is high and the content of light cement is low. When the content of the lightweight material is high, the compressive strength is weak and the absorption rate is high, so it can be seen that the physical properties are not satisfactory.

Therefore, the non-plastic artificial lightweight aggregate composition and its manufacturing method using the disclosed cementless binder can be secured to a predetermined strength even if it is manufactured by a cementless binder in a non-fired manner, and compared to conventional construction materials such as cement, Simple to provide artificial light aggregate at low manufacturing cost.

S101; Mixture manufacturing step
S103; Molding Step
S105; Curing stage
S107; Drying stage

Claims (7)

Consists of lightweight material, cementless binder, thickener and water,
The cement binder is composed of 100 parts by weight of fly ash, 2.2 to 5.2 parts by weight of lime, 1.2 to 3.2 parts by weight of anhydrous gypsum, 2.5 to 6.5 parts by weight of blast furnace slag powder, 0.5 to 2.2 parts by weight of magnesium chloride and 3.3 to 5.3 parts by weight of sodium carbonate. Non-plastic artificial lightweight aggregate composition using cement cement binder, characterized in that.
The method according to claim 1,
The non-plastic artificial lightweight aggregate composition using the cementless binder is cementedum binder, characterized in that consisting of 100 parts by weight of light weight material, 100 to 230 parts by weight of cement binder, 0.1 to 0.3 parts by weight of thickener and 25 to 35 parts by weight of water. Non-plastic artificial lightweight aggregate composition using.
The method according to claim 1 or 2,
The lightweight material is a non-plastic artificial lightweight aggregate composition using cement cement binder, characterized in that made of at least one selected from the group consisting of pearlite, vermiculite and bottom ash.
delete A mixture manufacturing step of mixing the light material, the cement binder and the thickener;
A molding step of mixing water into the mixture prepared through the mixture manufacturing step and molding into granules;
Curing step of curing the molded article formed through the molding step with steam; And
It consists of a drying step of drying the cured molding through the curing step,
The cement binder is composed of 100 parts by weight of fly ash, 2.2 to 5.2 parts by weight of lime, 1.2 to 3.2 parts by weight of anhydrous gypsum, 2.5 to 6.5 parts by weight of blast furnace slag powder, 0.5 to 2.2 parts by weight of magnesium chloride and 3.3 to 5.3 parts by weight of sodium carbonate. Method for producing a non-plastic artificial lightweight aggregate composition using a cementless binder, characterized in that.
The method according to claim 5,
The molding step is injected into a disk-shaped granulator having a rotating screen having a 45 to 55 degree inclination from the vertical while mixing the mixture prepared in the mixture manufacturing step by spraying water and the disk at a speed of 10 to 30 rpm Method for producing a non-plastic artificial lightweight aggregate composition using a cement cement binder, characterized in that consisting of a process for forming a granule by rotating for 20 minutes.
The method according to claim 5,
The curing step is steam curing the molded article formed through the molding step for 2 hours at a temperature of 35 to 45 ℃, steam curing for 2 hours at a temperature of 55 to 65 ℃, 10 at a temperature of 85 to 95 ℃ Method for producing a non-plastic artificial lightweight aggregate composition using a cement cement binder, characterized in that made by steam curing for a time.

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