KR20190047911A - Slag mixed type calcium silicated inorganic insulation fabrication method - Google Patents

Abstract

The present invention relates to a method of manufacturing a slag-mixed calcium silicate-based inorganic insulation material and, more specifically, to a method of manufacturing a slag-mixed calcium silicate-based inorganic insulation material, capable of securing constructability through enhancement of the initial strength of a calcium silicate-based inorganic insulation material and securing economic feasibility through use of low-priced raw materials by mixing slag, which is a byproduct generated during a steel making process, with cement and by using the mixture. According to an embodiment of the present invention, the method of manufacturing a slag-mixed calcium silicate-based inorganic insulation material comprises the following steps of: (a) preparing 100 wt% of a starting raw material, which usually consists of 45 to 50 wt% of a Portland cement (OPC), 10 wt% of quicklime, 30 to 35 wt% of slag, and 10 wt% of anhydrous gypsum; (b) forming a mixture by mixing 0.6 wt% of fine aggregate aluminum powder with 0.06 wt% of a pore stabilize with the starting raw material; (c) manufacturing slurry by mixing 130 wt% of mixed water with the mixture; and (d) forming a cured body by curing and drying the slurry.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a slag-mixed calcium silicate-

The present invention relates to a method of manufacturing a slag-incorporated calcium silicate-based inorganic heat insulating material, and more particularly, to a method of manufacturing a calcium silicate inorganic heat insulating material by mixing slag, which is a by- The present invention relates to a method of manufacturing a slag-incorporated calcium silicate-based heat insulating material which secures workability through the use of low-cost raw materials and ensures economical efficiency through use of low-cost raw materials.

Calcium silicate-based inorganic insulation materials are composed of non-combustible materials, which can overcome the vulnerability of existing organic insulation materials and the moisture vulnerability of inorganic insulation materials. In addition, the main raw material of the calcium silicate-based inorganic insulating material can be economically cured with low cost cement.

Similar products have been developed in Germany and Russia, but the characteristics of compressive strength have not reached the stage suitable for construction, so they are in the research and development stage.

Calcium silicate-based inorganic insulation material is similar to existing ALC (Autoclaved Lightweight Concrete) in that it is a porous inorganic insulation material. Hydrothermal synthesis in ALC prevents the shrinkage cracks caused by the hydration reaction in the gas by changing the SiO ₂ to tobermorite which affects the intensity expression in the starting material crystals of ALC or stopping the reaction of alkaline components.

That is, hydrothermal synthesis is considered to have the greatest influence on the strength development. Calcium silicate-based inorganic insulation materials are aimed at cheap raw materials and production methods, unlike existing expensive thermal insulation materials. The calcium silicate-based inorganic insulation material so far developed has a specific gravity of 0.12 g / cm ³ and a thermal conductivity of 0.045 W / mK, which is excellent in heat insulation property at an ultra light weight, but further studies are required for strength development with a compressive strength of 0.2 MPa.

During the research and development of calcium silicate-based inorganic insulation material, optimum raw materials and mixing conditions were derived through various raw materials and mixing conditions. The resulting blend conditions exhibited compressive strength exceeding 0.2 MPa (curing for more than 20 days) but only at the conditions of the Lab's optimum temperature and humidity.

In addition, in order to produce a large specimen, it was difficult to fabricate a steel mold instead of the conventional styrofoam mold. The reason for settling is that the alkali component of the starting material is excessively mixed, so that the hydration heat is initially increased unless the mold has a low temperature and does not affect the foaming, so that the inside which is not hardened due to the surface hardening due to the foaming process is settled down . A raw material having a large amount of alkali component in the starting material of the starting material is a cement which affects the strength. Calcium silicate-based inorganic insulating material Since more than 50% by weight of the starting material is cement, it is necessary to study the raw material which affects the strength development by replacing cement and has low alkaline content.

As a background of the present invention, there is a patent registration No. 1416046 entitled " Cement-based inorganic heat insulating material and its manufacturing method " (Patent Document 1). In the background art, a cement slurry is prepared by mixing 70.0 to 99.9 wt% of cement, 0.1 to 30.0 wt% of gypsum, 50 to 100 wt% of mixed water, 0.1 to 5.0 wt% of functional additive, and 0.1 to 7.0 wt% ; Water repellent treatment of the cement slurry by mixing 0.1 to 5.0 wt% of a water repellent agent in the cement slurry; Producing bubbles with 50 to 100 wt% mixed water and 0.1 to 5.0 wt% foaming agent; Mixing the water-repellent cement slurry with air bubbles; And curing a mixture of cement slurry and foam to produce a cured body, which cement has a specific gravity of 0.05 to 0.15 g / cm < 3 > and a thermal conductivity of 0.035 to 0.045 W / mK.

However, the inorganic thermal insulation material of the background art has a problem that it is difficult to improve the initial strength of the inorganic thermal insulation material and the economical efficiency through the use of low-cost raw materials can not be secured.

Patent Registration No. 1416046 " Cement-based inorganic insulating material and its manufacturing method "

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cement mortar composition which is obtained by mixing slag, which is a by- Can be manufactured stably. In addition, since the cement is replaced with a large amount of slag, a method of manufacturing a slag-incorporated calcium silicate-based inorganic insulating material is provided, which secures workability through improvement of initial strength of a calcium silicate-based inorganic insulating material and secures economical efficiency by using a low- It has its purpose.

The present invention provides a method for producing a cement composition, comprising the steps of: (a) preparing a starting material of 100 wt% consisting of 45 to 50 wt% of ordinary Portland cement (OPC), 10 wt% of burnt lime, 30 to 35 wt% of slag, and 10 wt% (b) mixing the starting material with 0.6wt% aluminum powder and 0.06wt% porestabilizer to form a blend; (c) blending 130wt% of the mixed water into the formulation to prepare a slurry; And (d) curing and drying the slurry to form a cured body. The present invention provides a method for manufacturing a slag-incorporated calcium silicate-based inorganic heat insulating material.

The slag is composed of 24.3 wt% of SiO ₂ , 40.9 wt% of CaO, 12.8 wt% of Al ₂ O ₃ , 0.50 wt% of Fe ₂ O ₃ , 4.0 wt% of SO ₃ , and 6.69 wt% of MgO Wherein the slag-mixed calcium silicate-based inorganic heat-insulating material is a slag-mixed calcium silicate-based inorganic heat-insulating material.

In addition, in step (a), the slag-incorporated calcium silicate-based thermal insulation material is further characterized in that 50.5 wt% of SiO ₂ , 29.7 wt% of CaO, and 1.80 wt% of SO ₃ are further added to the starting material And to provide a manufacturing method thereof.

The slag-incorporated calcium silicate-based inorganic thermal insulation material of the present invention is produced by mixing slag, which is a byproduct produced in the ferrous metal process, with cement so that the initial hydration heat is very low, And can be stably manufactured in an iron mold. In addition, since the cement is replaced with a large amount of slag, there is a very useful effect of securing the workability through the improvement of the initial strength of the calcium silicate-based heat insulating material and securing the economical efficiency by using the low-cost raw material.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention, Shall not be construed as limiting.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional method of manufacturing a calcium silicate-based heat insulating material. FIG.
FIG. 2 is a graph showing the compressive strength of each slag cement substitute.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings, but the present invention is not limited thereto.

Hereinafter, the technical structure of the present invention will be described in detail with reference to the preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a conventional method of manufacturing a calcium silicate-based heat insulating material. FIG.

As shown in FIG. 1, conventional calcium silicate-based thermal insulation materials are prepared by mixing powders of raw materials such as cement, anhydrous gypsum and quicklime as raw materials, mixing powdery materials and mixed water, and then mixing the aluminum powder. Aluminum powder is used as a foaming agent in calcium silicate-based insulating material. The slurry is foamed by the hydration reaction of the alkali component. (See Equation 1). At this time, the aluminum powder changes into a hydrate (Al (OH) ₃ ), and hydrogen gas is generated by reaction with calcium hydroxide (Ca (OH) ₂ ) generated from calcium oxide or cement.

_{2Al + 3Ca (OH) 2 +} 6H 2 O 3CaO + Al 2 O 3 + 6H 2 O + 3H 2

Or _{2Al + Ca (OH) 2 +} 6H 2 O Ca (Al (OH) 4) 2 + 3H 2 + 3H 2 ( Equation 1)

The slurry to be foamed due to the hydrogen gas is hardened by the hydration heat generated in the hydration reaction of the powder raw material and simultaneously with the foaming. When the cured foam is dehydrated through the curing process for 24 hours, the calcium silicate-based heat insulating material is completed.

The method for producing a slag-incorporated calcium silicate-based thermal insulation material according to the present invention comprises the steps of: (a) preparing a slag-containing calcium silicate-based heat insulating material comprising 100 to 100 wt% of an ordinary Portland cement (OPC) 45 to 50 wt%, quicklime 10 wt%, slag 30 to 35 wt% Preparing a starting material; (b) mixing the starting material with 0.6wt% aluminum powder and 0.06wt% porestabilizer to form a blend; (c) blending 130wt% of the mixed water into the formulation to prepare a slurry; And (d) curing and drying the slurry to form a cured body.

At this time, steps (a), (b) and (c) may be performed one after the other or simultaneously.

Starting material preparation

For the production method of the slag-incorporated calcium silicate-based inorganic heat insulating material according to the present invention, the powder raw material as the starting material was constituted as shown in Table 1.

% SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ CaO MgO SO ₃ Powder (g / cm ² ) OPC 11.8 5.86 2.83 59.7 4.02 3.55 8,600 Slag 24.3 12.8 0.50 40.9 6.69 4.02 6,300 Anhydrous gypsum 1.7 0.4 0.1 39.3 - 53.1 2,800 Lime stone 1.6 0.3 0.4 90.3 0.8 0.7 4,100

Table 1 is an ingredient analysis table of the starting materials used in the present invention.

Of the starting materials used in the present invention, the OPC is prepared by pulverizing one kind of ordinary cement and adjusting the powder to 8,600 g / cm ^2. Slag is slag used in the production of slag cement in OO concrete to 6,300 g / cm ² . Anhydrous gypsum of Chemius Korea Co., Ltd. In addition, the Pore Stabilizer (PDMS) from Wacker was used, and the AL powder, the blowing agent, was Y250 from Alco Engineering.

No. 8,600
OPC Slag Lime stone Anhydrous gypsum Water Pore
Stabilizer Al
Powder One 45 35 10 10 130 0.06 0.6 2 50 30 3 55 25 4 60 20 5 65 15 6 70 10

Table 2 shows the mixing conditions of the starting materials used in the present invention.

The calcium silicate-based heat insulating material is desorbed through the curing process after the slurry raw material is poured into the mold. It is also important that the fast initial strength development of the slurry foamed to a hardness suitable for demoulding the slurry at demoulding. Since the slag affects the long - term strength development more than the initial strength, the slag powder was pulverized to 6,300 g / cm ² in order to accelerate the reaction through pulverization.

The powders of the three kinds of slurries generally used are 3,200 g / cm ² , and when mixed into the mortar, they show strength after 15 days of curing. In slag-incorporated calcium silicate-based insulating material, the hardness of the slurry after 24 hours was two times harder than that of the existing calcium silicate insulation material. (Slurry incorporation 20kgf, conventional specimen 10kgf - using ALC slurry hardness tester) After demolding, the specimens were measured after 3 days, 7 days and 15 days curing conditions of 25 ~ 30 ℃ and relative humidity 60 ~ 75% Respectively.

Compared with existing calcium silicate-based heat insulating materials using OPC, calcium oxide, and gypsum as main raw materials for the calcium silicate heat insulating material using the slag according to the present invention, calcium silicate type heat insulating material In the case of the material, the characteristics such as specific gravity, thermal conductivity and compressive strength are examined, and the following experiment is carried out to obtain the optimum blending ratio of slag.

Basic Specimen Production

The mixing experiment in Table 2 is to replace OPC with slag and a part of the content. It is aimed to confirm the strength change according to the replacement amount, and further to maintain the thermal conductivity and specific gravity at 0.045 W / mK and 0.13 g / cm ³ .

Thermal Conductivity Measurement

Thermal conductivity (Plate Heat Flow Method, HC-074, EKO Co., Japan) Measured at 35 ° C in the upper plate and 15 ° C in the lower plate according to KS L 9016 standard. The unit of thermal conductivity is expressed as W / mK, measured in joules over 1 second through 1 m ² of the plate when there is a temperature difference of 1 K on both sides with a thickness of 1 m. The size of the thermal conductivity specimen is 20 cm x 20 cm x 3 cm.

Specific gravity measurement

The specimens were dried at 100 ° C for 24 hours under the conditions specified in KS F 2701, and the volume and weight of the specimens were measured and expressed in g / cm ³ .

Compressive strength measurement

The compressive strength was measured at a load rate of 9.8 N / sec according to KS F 2701 standard using WJ-100S, a universal material tester of WooJin. The compressive strength was converted into MPa by a value (kgf /) obtained by dividing the load by the sectional area of the test piece (㎠). The specimens were dried for more than 100 hours to measure compressive strength.

Fig. 2 is a graph showing the compressive strengths of the slag cement substitute contents blended under the conditions of Table 2. Fig.

FIG. 2A shows the results of curing, and the compressive strength and specific gravity were measured according to KS F 2701 as shown in FIG. 2A. No. 1 to No. 6, the compressive strength tends to decrease with decreasing slag.

With a specific gravity of less dry, depending on curing to cured air dry average 3 days 0.21g / cm ^3, 7 il 0.18g / cm ³ 15 il 0.15 g / cm ³ specific gravity jyeoteuna lowered, the compressive strength was confirmed a tendency increasing with the amount birthday , No. 2, 50 wt% of ordinary Portland cement (OPC) and 305 wt% of slag.

FIG. 2B is a graph showing the compressive strengths of the slag cement substitute contents measured after drying at 80 ° C. for 24 hours.

The compressive strength was measured by drying the specimens in the same manner as in FIG. 2A but drying the specimens with a specific gravity of 0.13 g / cm ³ according to the curing period. In consideration of the occurrence of cracks due to drying shrinkage during drying, the temperature was raised by 10 ° C every 5 hours from 30 ° C to 80 ° C and dried at 80 ° C for 24 hours. The specific gravity was lowered to 0.13 g / cm ³ , but cracks due to drying shrinkage were found in all specimens. The reproducibility of the compressive strength according to the specimen was deteriorated due to the difference in the presence or absence of cracks and the degree of each specimen. Under the condition 1, 6 It was confirmed that the compressive strength was decreased with the change in the condition of mixing. 1, the average Portland cement (OPC) 45wt%, and the slag 35wt%.

As a preferred embodiment of the method for producing a slag-incorporated calcium silicate-based inorganic insulating material according to the present invention, the starting materials of Table 1 such as OPC of 8,600 g / cm ² and slag of 6,300 g / cm ² are used.

The blending conditions were as follows: OPC 50 wt%, slag 30 wt%, quicklime 10 wt% and anhydrite 10 wt% were mixed with 130 wt% of mixed water for 3 minutes using an electric drill to prepare a primary slurry, and 0.06 wt% (Not to be compared with the powder), and the second mixing is carried out. Lastly, mixing of the Al powder with 0.6 wt% (relative to the powder) is carried out to complete the slurry of the slag-incorporated calcium silicate-based heat insulating material.

The completed slurry is poured into a mold and maintained at a relative humidity of 60 to 75% at 25 to 30 ° C, whereby the Al powder is foamed and cured within 1 hour. Degrease after curing in production condition for 24 hours and use according to the intended use.

The method of manufacturing a slag-incorporated calcium silicate-based inorganic heat insulating material of the present invention as described above allows the slag, which is a byproduct produced in the ferrous metal process, to be mixed with cement so that the initial hydration heat is very low, It can be stably foamed and can be manufactured stably even in an iron mold. In addition, since the cement is replaced with a large amount of slag, there is a very useful effect of securing the workability through the improvement of the initial strength of the calcium silicate-based heat insulating material and securing the economical efficiency by using the low-cost raw material.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. will be. The invention is not limited by these variations and modifications, but is limited only by the claims appended hereto.

Claims (3)

(a) preparing 100 wt% starting material consisting of 45 to 50 wt% of ordinary Portland cement (OPC), 10 wt% of burnt lime, 30 to 35 wt% of slag, and 10 wt% of anhydrous gypsum;
(b) mixing the starting material with 0.6wt% aluminum powder and 0.06wt% porestabilizer to form a blend;
(c) blending 130wt% of the mixed water into the formulation to prepare a slurry; And
and (d) curing and drying the slurry to form a cured body. The method for producing a slag-incorporated calcium silicate-based inorganic heat insulating material according to claim 1, The method according to claim 1,
The slag is composed of 24.3 wt% of SiO ₂ , 40.9 wt% of CaO, 12.8 wt% of Al ₂ O ₃ , 0.50 wt% of Fe ₂ O ₃ , 4.0 wt% of SO ₃ , and 6.69 wt% of MgO By weight based on the total weight of the calcium silicate-based inorganic insulating material. The method according to claim 1,
In step (a)
A method for producing a slag-incorporated calcium silicate-based thermal insulation material, which comprises adding 50.5 wt% SiO ₂ , 29.7 wt% CaO and 1.80 wt% SO ₃ to the starting material.

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