KR20100024091A - High-performance floor mortar composition using the plasticizer compound and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A mortar composition for a high-performance floor and a method of manufacturing thereof are provided to improve mobility and intensity of the mortar composition by reducing work unit quantity for 20%, and to prevent the mortar composition from cracking. CONSTITUTION: A mortar composition for a high-performance floor is consisted with 15~25wt% of cement, 65~80wt%of sand, 2~6wt% of fly ash, 1~5wt% of powder slag, 1~5wt% of crack reduction material, and 0.25~0.8% of admixture. The admixture is a plasticizer compound composed with 70~90wt% of inorganic binder, and 10~30wt% of superplasticizer. The inorganic binder is selected from the group consisting of limestone and silica.

Description

High-performance floor mortar composition using fluidized compound and method for manufacturing the same {HIGH-PERFORMANCE FLOOR MORTAR COMPOSITION USING THE PLASTICIZER COMPOUND AND MANUFACTURING METHOD THEREOF}

The present invention provides a high performance floor mortar composition using a fluidizing compound, and a method for producing the same, which significantly improves defects of floor finishing materials such as wood flooring by increasing the overall physical properties such as strength and fluidity by reducing the number of working units and reducing the occurrence of cracks. It is about.

The cement composition commonly used as finishing material for floor construction in most buildings such as houses, commercial buildings, structures, etc. is commonly referred to as floor mortar, and aggregates and cement are mixed in arbitrary proportions and water is added thereto. It means a cement composition in a state of mixing to have a predetermined adhesive force.

When the mortar is applied to the floor, there is a problem that cracks occur during dry shrinkage, defects such as peeling or lifting of the floor finish material, and strength decreases.

In order to improve the above problems, Korean Patent Registration No. 118630 (registered on July 1, 1997) prepares ondol plastering mortar by mixing calcium sulfate to produce more hydration products during the hydration reaction of cement to expand the cement particles. A technique of reducing voids in cement particles by fundamentally preventing cracks of plaster mortar is disclosed.

Korean Patent Registration No. 0340296 (registered on May 29, 2002) discloses an expansion regulator, anhydrous gypsum or quicklime on a mortar made of cement, sand, fly ash and thickener to provide a floor mortar in which dry shrinkage of flooring does not occur. The technique which manufactures the floor mortar composition which mix | blends the shrinkage of an initial stage of drying and a late stage of drying uniformly by mixing is disclosed.

However, the prior art as described above, the strength of the work unit is reduced due to the high quantity of work, and a large amount of cracks are generated, and the floor finish material such as wood floor is peeled off due to the generation of the latent layer, and the floor finish material is excited by the moisture on the bottom surface. And defects still occurred.

Therefore, the situation is required to develop a high-performance floor mortar composition to solve the problems of the strength, cracks and defects of the floor finish material by reducing the amount of work unit compared to the conventional mortar composition.

An object of the present invention is to provide a high-performance floor mortar composition that significantly improves defects of floor finishing materials such as wood flooring by increasing the overall physical properties such as strength and fluidity by reducing the number of working units and reducing the occurrence of cracks.

In addition, another object of the present invention is to provide a method for producing the high performance floor mortar composition.

In order to achieve the above object, the present inventors earnestly studied, and when adding a fluidizing compound composed of an inorganic binder and a fluidizing agent as a admixture to the mortar composition, the amount of work unit is about 20% to obtain the same workability It was confirmed that the strength is increased, the occurrence of cracks is reduced, and defects such as peeling and lifting of the flooring material are greatly improved, thereby completing the present invention.

The present invention is 15 to 25% by weight of cement, 65 to 80% by weight, 2 to 6% by weight of fly ash, 1 to 5% by weight of slag and 1 to 5% by weight of the mortar composition including 100 parts by weight It comprises 0.25 to 0.8 parts by weight of the admixture, the admixture provides a floor mortar composition, characterized in that the fluidizing compound consisting of 70 to 90% by weight of the inorganic binder and 10 to 30% by weight of the fluidizing agent.

In addition, the present invention provides a method for producing the floor mortar composition, the first step of preparing a fluidizing compound by mixing 70 to 90% by weight of the inorganic binder and 10 to 30% by weight of the fluidizing agent; And a second step of mixing cement, sand, fly ash, powder slag, and crack reducing material with the prepared fluidizing compound.

According to the present invention, by including a high-performance fluidizing agent in the form of a compound, it is possible to ensure the metering stability of the fluidizing agent, to be uniformly mixed with the other components included in the mortar composition and to increase the mixing efficiency, cement When curing, the particle size of the inorganic binder may be fine to fill the micropores. Through this, by reducing the amount of work unit by about 20% compared with the conventional mortar composition, the overall physical properties of the strength and fluidity is increased, and the occurrence of cracks is reduced, and the peeling of the floor finishing material (wood floor) by the production of the latent layer It is possible to greatly improve defects such as development, lifting phenomenon of the floor finish due to moisture on the floor.

The present invention relates to a high performance floor mortar composition and a method for producing the same, which greatly improves the defects of floor finishing materials such as wood flooring by increasing the overall physical properties of the strength and fluidity by reducing the number of working units and reducing the occurrence of cracks.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The high performance floor mortar composition of the present invention is characterized in that it contains a fluidizing compound as a admixture in a mortar composition including cement, sand, fly ash, powder slag and crack reducing material.

In addition, the method for producing a floor mortar composition of the present invention comprises a first step of preparing a fluidizing compound that is a mixed agent by mixing 70 to 90% by weight of the inorganic binder and 10 to 30% by weight of the fluidizing agent; And a second step of mixing cement, sand, fly ash, powder slag and crack reducing material with the prepared fluidization compound.

Cement can use various mixed cements, such as portland cement, heavy thermal cement, and crude steel cement, and can be selected in consideration of economy and workability. The cement may be included in an amount of 15 to 25 wt% based on the total content (100 wt%) of the mortar composition including cement, sand, fly ash, powder slag, and crack reducing material.

Sand is used as aggregate and may include 65 to 80% by weight relative to the total content of the mortar composition (100% by weight).

Fly ash, which is used as a binder, may use ash collected by a dust collector from a flue gas of a coal fired boiler such as a thermal power plant, and is effective in improving flowability by being included in a mortar composition. The fly ash may be included in an amount of 2 to 6 wt% based on the total content of the mortar composition (100 wt%).

Flour slag is used as a binder together with fly ash and is a by-product produced during steelmaking and steelmaking. The slag slag may be included in 1 to 5% by weight based on the total content of the mortar composition (100% by weight).

The crack reducing material is used to suppress the occurrence of cracks by shrinkage by maintaining a constant shrinkage compensation effect at the beginning and the end of drying during shrinkage.

The crack reducing material may be prepared by firing a mixture of limestone 30 to 50% by weight and coke 50 to 70% by weight at a temperature of 800 to 900 ℃.

Chemical composition of the crack reducing material is composed of SiO ₂ 0.48%, Al ₂ O ₃ 0.23%, Fe ₂ O ₃ 0.21%, CaO 70.38%, SO ₃ 21.85% and other components 6.85%, the average particle diameter of 150 ㎛ 1 It is preferably composed of 15 to 25% by weight, 15 to 25% by weight of 88 to 150 μm, and 50 to 70% by weight of 15 to 25% by weight of 88 μm or less. That is, an average particle diameter of 88 µm or more is effective for plastic shrinkage and initial dry shrinkage.

In addition, the crack reducing material may be composed of anhydrous gypsum 70 to 90% by weight and quicklime 10 to 30% by weight.

The crack reducing material may be included in an amount of 1 to 5% by weight based on the total content of the mortar composition (100% by weight).

The admixture is a fluidizing property improving material, and is preferably a fluidizing compound composed of an inorganic binder and a fluidizing agent. Here, the "fluidizing compound" includes an inorganic binder and a fluidizing agent, and means that each of the components included in a uniformly mixed state, and includes both liquid, solid and powder.

In general, since the fluidizing agent has a low specific gravity and is added in a small amount with respect to the weight of the final product, an error may occur in weighing, and when it is mixed directly with the mortar composition, it may adversely affect the required quality of the product. On the other hand, when the fluidizing compound of the present invention is used as a admixture, it is possible to secure the metering stability and to uniformly mix with the other components included in the mortar composition and to increase the mixing efficiency, thereby operating the mortar composition. It is possible to prevent cracks by reducing the unit quantity and increasing the strength and fluidity.

As said fluidizing agent, a lignin sulfonate type compound, a polymelamine sulfonate type compound, a polynaphthalene sulfonate type compound, a polycarboxylic acid type compound, etc. which are dispersing agents can be used individually or in mixture of 2 or more types. However, since lignin sulfonate compounds may have problems with excessive retardation, and polymelamine sulfonate compounds are expensive, in the present invention, polynaphthalene sulfonate compounds, polycarboxylic acid compounds, or mixtures thereof as a fluidizing agent may be used. It is preferable to use either.

In addition, the inorganic binder is preferably any one of limestone, silica sand or a mixture thereof. The fluidizing agent has a risk of change when exposed to moisture, and the inorganic binder having the above inert properties is preferable because there is a possibility that a change in quality due to reaction between raw materials may occur when stored for a long time.

The inorganic binder preferably has a powder degree of 4500 to 6500 cm 2 / g. When the powder degree is in the above range, it is finer than cement, so that the micropores can be filled during curing of the cement, thereby improving strength and fluidity.

The fluidizing compound is preferably composed of 70 to 90% by weight of the inorganic binder and 10 to 30% by weight of the fluidizing agent. In particular, when the fluidizing agent is a polycarboxylic acid compound, it is preferable that the inorganic binder consists of 80 to 90% by weight of the inorganic binder and 10 to 20% by weight of the fluidizing agent. When the content of the fluidizing agent is increased, the volume is increased with respect to the same weight, so that the metering stability is lowered. Therefore, it is more preferable to include in the above ratio in that the stability of the final mortar composition can be achieved through the improvement of metering stability.

The above-mentioned inorganic binder and a fluidizing agent may be mixed to prepare a fluidizing compound. More specifically, the inorganic binder and the fluidizing agent may be added to the mixer, followed by mixing for 1500 to 3000 seconds at 1500 to 3000 rpm, preferably at 150 to 220 seconds at 1800 to 2500 rpm.

The fluidizing compound admixture is preferably included in an amount of 0.25 to 0.8 parts by weight based on 100 parts by weight of the mortar composition including sand, fly ash, powder slag and crack reducing material. If the content is less than 0.25 parts by weight, it is difficult to expect a function to reduce the unit quantity in a state of securing a certain workability, and if it exceeds 0.8 parts by weight, excessive bleeding, material separation, condensation delay may occur. .

The above components may be mixed to prepare a floor mortar composition. In more detail, first, the inorganic binder and the fluidizing agent are mixed in the mixer to prepare and store the fluidizing compound, and then the cemented sand, fly ash, powder slag, and crack reducing material and the prepared fluidizing compound are collected and mixed with mortar in the siro apparatus. The composition can be prepared. At this time, the siro apparatus may use the apparatus proposed in Korean Patent Registration No. 0668066 (registered on January 5, 2007).

The high performance floor mortar composition of the present invention prepared by the above method can be uniformly mixed by including a fluidizing agent in the form of a compound compared to the conventional mortar composition, while reducing the work unit quantity by about 20%, while at the same time strength and flowability It can increase the overall physical properties of.

Hereinafter, preferred examples are provided to aid the understanding of the present invention, but the following examples are merely for exemplifying the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention. It is natural that such variations and modifications fall within the scope of the appended claims.

Example 1

70 parts by weight of limestone and 30 parts by weight of polynaphthalenesulfonate-based compound were added to the mixer, and the mixture was mixed at 2200 rpm for 180 seconds to prepare a fluidizing compound (A).

In the siro apparatus, 18.2% by weight of cement, 72% by weight of sand, 4.5% by weight of fly ash, 2% by weight of powder slag, 3.3% by weight of crack reducing material and 0.27 parts by weight of the prepared fluidizing compound (A) were added and mixed for 3 minutes. A mortar composition was prepared. In this case, as the crack reducing material, a mixture of 30-50 wt% of limestone and 50-70 wt% of coke was calcined at 800 to 900 ° C.

Example 2

The same procedure as in Example 1 was carried out except that the fluidization compound (A) was used at 0.33 parts by weight.

Example  3

The same procedure as in Example 1 was carried out except that the fluidization compound (A) was used at 0.40 part by weight.

Example 4

The same procedure as in Example 1 was carried out except that the fluidization compound (A) was used at 0.47 parts by weight.

Example  5

90 parts by weight of limestone and 10 parts by weight of a polycarboxylic acid compound were added to the mixer, followed by mixing at 2200 rpm for 180 seconds to prepare a fluidizing compound (B).

Except for using the prepared fluidizing compound (B) in 0.3 parts by weight, it was carried out in the same manner as in Example 1.

Example 6

The same procedure as in Example 1 was carried out except that the fluidization compound (B) was used at 0.6 parts by weight.

Comparative Example 1

The same procedure as in Example 1 was carried out except that no fluidizing compound was used.

Comparative Example 2

The same procedure as in Example 1 was carried out except that the fluidization compound (A) was used at 1.33 parts by weight.

Comparative example  3

The same procedure as in Example 1 was carried out except that the fluidizing compound (B) was used at 0.90 parts by weight.

Comparative Example 4

The same procedure as in Example 1 was carried out except that 0.12 parts by weight of naphthalene-based fluidizing agent was used instead of the fluidizing compound.

Comparative Example 5

The same procedure as in Example 1 was carried out except that the polycarboxylic acid-based fluidizing agent was used at 0.03 part by weight instead of the fluidizing compound.

Each component and composition of the floor mortar composition prepared in Examples and Comparative Examples are shown in Table 1 below.

division cement sand Fly ash Bun slag Crack reducing material Glidants Securitization compound naphthalene Polycarbon A B Example 1 18.2 72 4.5 2 3.3 - - 0.27 - Example 2 18.2 72 4.5 2 3.3 - - 0.33 - Example 3 18.2 72 4.5 2 3.3 - - 0.40 - Example 4 18.2 72 4.5 2 3.3 - - 0.47 - Example 5 18.2 72 4.5 2 3.3 - - - 0.30 Example 6 18.2 72 4.5 2 3.3 - - - 0.60 Comparative Example 1 18.2 72 4.5 2 3.3 - - - - Comparative Example 2 18.2 72 4.5 2 3.3 - - 1.33 - Comparative Example 3 18.2 72 4.5 2 3.3 - - - 0.90 Comparative Example 4 18.2 72 4.5 2 3.3 0.12 - - - Comparative Example 5 18.2 72 4.5 2 3.3 - 0.03 - -

Test Example 1. Property Test

Physical properties of the mortar compositions for floors prepared in Examples and Comparative Examples were tested by the following methods, and the results are shown in Table 2 below.

Unit quantity (parts by weight): The unit quantity used to measure the flow value to be about 200 ± 10 mm was measured.

Flow (mm): The prepared mortar composition was mixed for 1 minute based on the mechanical mixing method of the hydraulic cement paste of KS L 5109 and the mortar, and the amount of kneading water was determined so that the flow became 200 ± 10 mm. The flow of the mixture was measured by filling the flow cone using a flow cone having a diameter of 70 mm, a diameter of 100 mm, and a height of 50 mm as specified in KS L 5111, and then measuring the flow by lifting the flow cone without compaction. .

-Air amount (%): The unit volume weight was measured in the same manner as above, and then the mortar air amount meter was placed on the upper part to prevent air from leaking out.

-Compressive strength (N / mm2): The test was conducted according to the compressive strength test method of hydraulic cement mortar of KS L 5109. The compaction of mortar mixed in the mold was ensured fluidity and was not tested separately. The molded mortar was stored in a humid chamber for 48 hours and then demolded and stored in a humid chamber for 5 days, after which the compressive strength was measured while curing in a laboratory at a temperature of 22 ° C. and a humidity of 60%.

division Unit quantity (part by weight) Flow (mm) Air volume (%) Compressive strength (N / ㎡) 3 days 7 days 28 days Example 1 18.9 196 3.0 12.9 18.5 31.5 Example 2 18.2 201 3.8 14.5 19.3 33.0 Example 3 17.8 204 4.4 15.5 19.8 34.1 Example 4 17.3 198 4.2 16.2 20.1 36.1 Example 5 17.0 205 3.8 15.0 18.8 36.4 Example 6 16.7 208 4.5 15.2 19.4 36.8 Comparative Example 1 22.2 198 3.2 9.1 12.7 21.6 Comparative Example 2 13.5 201 8.7 12.8 16.6 27.3 Comparative Example 3 13.0 197 7.8 13.5 16.2 28.6 Comparative Example 4 19.8 198 5.5 11.1 15.7 26.5 Comparative Example 5 19.5 194 5.7 12.3 16.6 27.3

As shown in Table 2, the mortar composition of Examples 1 to 6 containing 0.25 to 0.8 parts by weight of the fluidizing compound according to the present invention, the unit amount of 15 to 25% compared to Comparative Example 1 does not include a fluidizing agent It was reduced in degree, and the compressive strength was superior to 46 to 70%. In addition, as the amount of the fluidization compound used increased, the amount of unit showed a tendency to decrease, and when a predetermined amount or more was added, the amount of air increased and the compressive strength tended to decrease.

In detail, the composition of Comparative Example 1, which does not include a fluidizing agent, should be used in an amount of about 3.3 to 5.5 parts by weight more than the amount of units required in Examples in order to secure proper dough for in situ casting. The increase in the number of units reaches about 15 to 25%. Therefore, the compressive strength was lowered and showed about 21.6 N / mm ² slightly exceeding the reference value of 21.0 N / mm ² suggested by KS L 5220. In the compositions of Comparative Examples 2 to 3 containing an excess of the fluidizing compound, the amount of the unit decreased as the amount of the fluidizing agent increased, but the amount of air increased excessively so that the increase in compressive strength was not larger than in the examples. This is because the generated bubbles do not escape as the viscosity increases. In addition, the flow shows an appropriate value, but the viscosity of the pump during field work due to the excessive reduction of the unit quantity may cause problems in pump pumpability, and the floor plastering may be delayed due to the delay of the initial curing process due to the excessive use of the admixture. Due to the delay of finishing work, it is difficult to secure a clean floor.

Test Example 2 Floor moisture content measurement test

After pouring the mortar composition for floors prepared in Examples 1, 3, 5 and Comparative Example 1 on 50 mm thick sand, the moisture content for each age was measured and the results are shown in FIG. 1.

As shown in Figure 1, the mortar compositions for floors of Examples 1, 3 and 5 according to the present invention was confirmed to have a low water content compared with the composition of Comparative Example 1. In general, when the mortar composition is poured into the bottom layer and heated in a state containing excess moisture, the moisture is moved to the upper part and evaporated to cause the floor finishing material to be lifted. Therefore, when applying the composition according to the present invention it is possible to improve the lifting phenomenon of the floor finish material due to the low moisture content of the bottom surface.

Test Example 3 Measurement of Length Change Rate

Inside the frame of 100 mm (width) × 1000 mm (length) × 50 mm (height), one end of the length is inserted with a hook to fix the floor mortar, and the other end is free to move. Injecting the floor mortar composition prepared in Examples 1, 3, 5 and Comparative Example 1 into the length change rate measurement test device connected to the 1/1000 mm dial gauge and the length change of the floor mortar in the longitudinal direction according to the age Was measured and the result is shown in FIG.

As shown in FIG. 2, the mortar compositions for floors of Examples 1, 3 and 5 according to the present invention had almost no initial rate of change in length after pouring, and a slight length change rate was measured after about 12 days. On the other hand, the mortar composition for floor of Comparative Example 1 showed a large change in length immediately after pouring, and the length change rate was continuously increased as the age of age. It can be seen that when the length change rate of the mortar composition for floors increases, the amount of cracks increases and the width of cracks increases. Therefore, in the case of using the composition of the present invention, after the construction of the floor finishing material in the future it is possible to reduce the incidence of the floor material defects caused by the concentration of moisture in the interior of the floor mortar.

1 is a graph measuring the water content of the mortar composition prepared in Examples 1, 3, 5 and Comparative Example 1 of the present invention.

Figure 2 is a graph measuring the rate of change of the mortar composition prepared in Examples 1, 3, 5 and Comparative Example 1 of the present invention.

Claims (11)

Admixture 0.25 to 100 parts by weight of mortar composition comprising 15 to 25% by weight of cement, 65 to 80% by weight of sand, 2 to 6% by weight of fly ash, 1 to 5% by weight of slag and 1 to 5% by weight of crack reducing material It is made up to include 0.8 parts by weight,  The admixture is a flooring mortar composition, characterized in that the fluidizing compound consisting of 70 to 90% by weight of the inorganic binder and 10 to 30% by weight of the fluidizing agent. The floor mortar composition of claim 1, wherein the inorganic binder is one or more selected from the group consisting of limestone and silica sand. The floor mortar composition of claim 1 or 2, wherein the inorganic binder has a powder degree of 4500 to 6500 cm 2 / g and fills micropores during cement hardening. The floor mortar composition according to claim 1, wherein the fluidizing agent is at least one selected from the group consisting of polynaphthalenesulfonate compounds and polycarboxylic acid compounds. The floor mortar composition according to claim 1, wherein the crack reducing material is prepared by firing a mixture of 30 to 50 wt% of limestone and 50 to 70 wt% of coke at 800 to 900 ° C. Admixture 0.3 per 100 parts by weight of mortar composition including 15 to 25% by weight of cement, 65 to 80% by weight of sand, 2 to 6% by weight of fly ash, 1 to 5% by weight of slag, 1 to 5% by weight of crack reducing material As a method for producing a floor mortar composition comprising from 1.33 parts by weight, A first step of preparing a fluidizing compound by mixing 70 to 90 wt% of an inorganic binder and 10 to 30 wt% of a fluidizing agent; And A method for producing a floor mortar composition comprising a second step of mixing cement, sand, fly ash, powder slag and crack reducing material, and the prepared fluidizing compound. The method of claim 6, wherein the inorganic binder is at least one selected from the group consisting of limestone and silica sand. 7. The method of claim 6, wherein the inorganic binder has a powder degree of 4500 to 6500 cm 2 / g. The method of claim 6, wherein the fluidizing agent is at least one selected from the group consisting of polynaphthalenesulfonate compounds and polycarboxylic acid compounds. The method of claim 6, wherein the first step is performed at 1500 to 3000 rpm for 100 to 300 seconds. The method of claim 6, wherein the second step is performed using a siro apparatus.

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