KR20020009336A - Cement mortar composition for gluing tile - Google Patents

Abstract

PURPOSE: A cement mortar composition for attaching tiles(tile cement composition) composed of cement, inorganic aggregates and an admixture is provided, which has improved strength, adhesive power and durability compared with a conventional tile cement composition using hydraulic cement. CONSTITUTION: The tile cement composition comprises cement, inorganic aggregates and 0.8-1.0%(based on the amount of cement) of admixture containing methyl cellulose and polyvinyl alcohol, where the use ratio of methyl cellulose to admixture(methyl cellulose + polyvinyl alcohol) is 0.6-0.8. Also, fly ashes are added to the composition to be the ratio of replacing cement with fly ash being 7-11%, which enable to produce the tile cement composition with the same characteristics as the composition excluding fly ash.

Description

Cement mortar composition for tile attachment {CEMENT MORTAR COMPOSITION FOR GLUING TILE}

The present invention relates to a cement mortar composition for tile attachment (hereinafter abbreviated as " tile cement composition ") for attaching a tile used as a finishing material to an inner wall or an outer wall of a building.

In most buildings, tile cement compositions using hydroponic cement are mainly used to attach tiles, which are used as finishing materials, to improve interior and exterior aesthetics. However, when the tile is attached using a conventional tile cement composition made of hydraulic cement, the adhesion force of the tile cement composition decreases due to the freeze-thawing of the tile cement composition due to moisture infiltration and the repetition of wet and dry by changing the weather. In turn, the tile is separated from the tile cement composition. Thus, there is a limit to the use of the tile as a finishing material of the outer wall despite the outstanding aesthetics.

In addition, even when tiles are used in bathrooms or toilets, dropouts frequently occur due to excessive moisture.

The fall of tiles due to the deterioration of the adhesive strength of the tile cement composition causes economic problems such as impairing the aesthetics of the building and increasing the cost for maintenance and repair, and in addition, may cause a dispute between the contractor and the owner of the poor construction work. do.

Due to the above problems, the producers and users of tile cement compositions desperately need a tile cement composition that does not degrade adhesion durability even when exposed to outside air and excessive moisture.

The present invention was developed to meet the above demands, and aims to provide a tile cement composition having improved strength, adhesion and durability than the conventional tile cement composition while satisfying the standard by newly adjusting the composition of cement mortar. It is done.

The purpose of the present invention is to specifically select the amount of admixture and the amount of fly ash used, so that the strength, adhesion and durability of the tile cement can be improved than the conventional tile cement.

In order to achieve the above object, the tile cement composition of the present invention is a composition composed of cement, an inorganic aggregate, and a admixture, wherein the admixture is composed of a mixture of methyl cellulose and polyvinyl alcohol and is 0.8 wt.% Based on the cement weight of the cement mortar composition. % To 1.0%, and the amount of methyl cellulose to 0.6 to 0.8 of the amount of the admixture combined with the amount of the methyl cellulose and polyvinyl alcohol in the admixture is configured to be 0.6 to 0.8.

In the present invention, when the admixture is added to 0.9% of the cement weight of the cement mortar composition, and the ratio of the amount of methyl cellulose used is 0.7, a more preferable cement mortar composition for tile attachment can be made.

Furthermore, the fly ash is preferably added to the cement mortar composition for attaching tiles such that the fly ash cement replacement rate is 7% to 11%.

Hereinafter, the configuration of the present invention will be described in detail.

The tile cement composition of the present invention is composed of cement, an inorganic aggregate and a admixture, and an admixture may be further added. Generally, a polymer is used as the admixture used in the cement mortar composition, and a cellulose derivative is used as the admixture in the tile cement composition of the present invention. More specifically, it is preferable to use methyl cellulose (MC) and / or polyvinyl alcohol (PVA) as a admixture of the tile cement composition of the present invention.

In the tile cement composition of the present invention, the admixture composed of the cellulose derivative is added at 0.8% to 1.0% by weight of the cement of the cement mortar composition. When the admixture is added at less than 0.8%, the shear strength when the tile cement composition is cured becomes less than or equal to the predetermined reference strength, and the adhesive force is lowered, which is not suitable for use for tile attachment. In addition, when the admixture exceeds 1.0%, construction problems such as difficulty in mixing and finishing the cement occur, which is not suitable as a tile cement composition. The most preferred range is 0.85% to 0.95%, and the optimum admixture ratio is 0.9%.

In the tile cement composition of the present invention, methylcellulose and / or polyvinyl alcohol in cellulose derivatives may be mixed or used alone as a admixture. The ratio of the amount of methyl cellulose used (MC amount) to the amount used (used amount of PVA), i.e., the amount of methyl cellulose used (the amount of methyl cellulose used (the amount of used methyl cellulose + amount of polyvinyl alcohol)) is preferably in the range of 0.6 to 0.8.

If the proportion of methylcellulose used is less than 0.6, the amount of polyvinyl alcohol used is relatively high, and the flow value of mortar indicating the fluidity of mortar becomes excessive. When the flow rate of mortar becomes excessive, the phenomenon which mortar falls off from the structure at the time of attaching a tile to a perpendicular structure will arise, and workability will fall extremely. In addition, the shear strength is lowered when the proportion of methylcellulose used is less than 0.6. Therefore, the ratio of methylcellulose used in the mortar composition of the present invention should be 0.6 or more.

On the other hand, when the ratio of the amount of methyl cellulose used exceeds 0.8, the penetration becomes excessively large, making it unsuitable for use as a tile cement. Penetration is an indicator of the mortar's resistance to shear deformation and ease of operation.

In the present invention, in consideration of the strain invasion which shows the resistance to shear strength, flow value and shear deformation, the most preferable proportion of methylcellulose used is 0.7.

Next, look at with respect to experimental examples and comparative experimental examples of the tile cement composition according to the present invention.

First, the ratio of the amount of methyl cellulose used in the admixture was fixed to 0.7, and the experiment was performed by changing the amount of admixture used.

Comparative Example 1

Cement Usage: 200g

Fine Aggregate Consumption: 300g

Admixture used: Methyl cellulose and polyvinyl alcohol mixed

Usage of Admixture: 1.2g (0.6% of Cement Total Weight)

Methyl Cellulose Usage: 0.84g

(The ratio of methyl cellulose to 0.7 of the admixtures)

Polyvinyl Alcohol Consumption: 0.56g

Experimental Example 1

Cement Usage: 200g

Fine Aggregate Consumption: 300g

Admixture used: Methyl cellulose and polyvinyl alcohol mixed

Usage of Admixture: 1.6g (0.8% of Total Cement Weight)

Methylcellulose Usage: 1.12g

(The ratio of methyl cellulose to 0.7 of the admixtures)

Polyvinyl Alcohol Consumption: 0.48g

Experimental Example 2

Cement Usage: 200g

Fine Aggregate Consumption: 300g

Admixture used: Methyl cellulose and polyvinyl alcohol mixed

Amount of Admixture: 1.8g (0.9% of Total Cement Weight)

Methylcellulose Usage: 1.26g

(The ratio of methyl cellulose to 0.7 of the admixtures)

Polyvinyl Alcohol Usage: 0.54g

Experimental Example 3

Cement Usage: 200g

Fine Aggregate Consumption: 300g

Admixture used: Methyl cellulose and polyvinyl alcohol mixed

Usage of Admixture: 2.0g (1.0% of Total Cement Weight)

Methyl Cellulose Usage: 1.4g

(The ratio of methyl cellulose to 0.7 of the admixtures)

Polyvinyl Alcohol Consumption: 0.6g

Comparative Example 2

Cement Usage: 200g

Fine Aggregate Consumption: 300g

Admixture used: Methyl cellulose and polyvinyl alcohol mixed

Usage of Admixture: 2.4g (1.2% of Cement Total Weight)

Methylcellulose Usage: 1.68g

(The ratio of methyl cellulose to 0.7 of the admixtures)

Polyvinyl Alcohol Consumption: 0.72g

Next, the experiment was performed by varying the amount of methyl cellulose used in the case where the ratio of the amount of admixture to the amount of cement was fixed at 0.9%.

Comparative Example 3

Cement Usage: 200g

Fine Aggregate Consumption: 300g

Admixture used: Methyl cellulose and polyvinyl alcohol mixed

Amount of Admixture: 1.8g (0.9% of Total Cement Weight)

Methylcellulose Usage: 0.9g

(Ratio of Methyl Cellulose Consumption of Admixture 0.5)

Polyvinyl Alcohol Consumption: 0.9g

Experimental Example 4

Cement Usage: 200g

Fine Aggregate Consumption: 300g

Admixture used: Methyl cellulose and polyvinyl alcohol mixed

Amount of Admixture: 1.8g (0.9% of Total Cement Weight)

Methylcellulose Usage: 1.08g

(The ratio of methyl cellulose to 0.6% of admixture usage)

Polyvinyl Alcohol Consumption: 0.72g

Comparative Example 4

Cement Usage: 200g

Fine Aggregate Consumption: 300g

Admixture used: Methyl cellulose only

Usage of Admixture: 2.0g (1.0% of Total Cement Weight)

Methylcellulose Usage: 2.0g

(The ratio of methyl cellulose used to 1.0% of admixture)

Polyvinyl Alcohol Consumption: 0 g

Shear strength, penetration, and flow values were measured for each of the above experimental and comparative test examples.

(1) shear strength

Shear strength was attached to the mortar composition according to the experimental and comparative examples on the back of the tile so that the mortar layer is 3mm, it was cured in a thermo-hygrostat with a temperature of 23 ± 2 ℃, relative humidity 50 ± 5%. Shear strength was calculated by dividing the maximum load measured in the tester by the adhesive area of the tile after loading the specimen at 1000kgf / min.

As a result, in Comparative Example 1 in which the amount of admixture used was 0.6% of the total weight of cement, the shear strength was 9.2 kg / cm 2, which was less than the reference shear strength of 10.5 kg / cm 2. On the other hand, in the case of Experimental Examples 1 to 3 and Comparative Example 2, where the amount of admixture is 0.8%, 0.9%, 1.0% and 1.2% of the total weight of cement, the shear strength is 11.02㎏ / ㎠ and 12.83㎏ / Cm 2, 14.21 kg / cm 2, and 15.33 kg / cm 2 all exceeded the standard shear strength.

In addition, in Comparative Example 3, the shear strength was 9.82 ㎏ / ㎠, which did not reach the standard shear strength, but in Experiment 4 and Comparative Example 4, the shear strengths were 12.83 ㎏ / ㎠ and 10.96 ㎏ / ㎠, respectively. The standard shear strength was exceeded.

(2) intrusion degree

Penetration is an indicator for evaluating the resistance of the mortar to deformation. In general, the greater the penetration, the easier it is to attach the tile using mortar. In this experiment, a circular plate of about 27 mm was installed at the end of the penetration tester, and the penetration depth into the mortar composition was measured by 300 g of needles.

As a result of the experiment, Comparative Example 1 was 6.2 cm, and Example 1, Example 2 and Example 3 were 5.4 cm, 5.2 cm, and 6.1 cm, respectively. In Comparative Example 2, the penetration depth was somewhat 11.5 cm. Turned out to be great.

Comparative Examples 3 and 4 were 5.6 cm and 7.2 cm, respectively, while Comparative Example 4 was 12.0 cm, indicating that the penetration depth was excessive.

(3) flow value

The flow value is an index indicating the flowability of the mortar. If the flow value is excessive, the mortar falls off during the tile attaching operation of the vertical structure, resulting in poor workability.

As a result of measuring the flow value, it was 13.5 cm for Comparative Example 1, and Examples 1, 2 and 3 were 14 cm, 15.2 cm, and 16 cm, respectively, and for Comparative Example 2, flow was 18 cm. The value was found to be excessively large.

In Comparative Example 3, the flow value was also measured to be too large as 21 cm, but in Example 4 it was 13.8 cm, and in Comparative Example 4 it was 17.0 cm.

On the other hand, the present invention provides a tile cement composition to which a fly ash (Fly Ash) is added as a mixed material used to replace the cement. In general, fly ash reacts with calcium hydroxide in cement hydrate to produce an insoluble compound that is insoluble in water, densifying the cement hydrated structure, and reducing the length change due to repetition of wet and dry.

In addition, fly ash is a combustion waste of fuel collected from coal stacks of thermal power plants and steel mills. Therefore, fly ash has an advantage of protecting the environment in that it is cheaper than cement and recycles industrial waste.

In the tile cement composition of the present invention, the fly ash is added so that the cement replacement rate of the fly ash is 7% or more and 11% or less. Here, the cement replacement rate of the fly ash means the amount of fly ash to the combined weight of the fly ash and cement. That is, the cement replacement rate of the fly ash is (the amount of fly ash) / (the amount of fly ash + the amount of cement used).

When the cement replacement rate of the fly ash exceeds 11%, the shear bond strength is lowered, making it unsuitable as a tile cement. On the other hand, if the cement replacement rate of the fly ash is less than 7% there is no economic advantage of replacing the cement with fly ash. Based on the shear strength, in the present invention, the cement replacement rate of the most preferred fly ash is 10%.

In the case of the present invention where the fly ash cement replacement rate is 7% or more and 11% or less, the flow value of mortar is to maintain the conventional tile cement level. Therefore, by using the fly ash in the above range, the tile cement composition having a good physical properties equivalent to or better than the conventional tile cement composition that does not use the fly ash in terms of shear adhesion strength and flow value while saving the amount of cement I can make it.

Next, experiments were performed on the case where the cement replacement rate of fly ash was 0%, 5%, 7%, 10%, and 15% for the case where the optimum admixture addition ratio was 0.9% and methyl cellulose use ratio, respectively.

Comparative Example 5

Fine Aggregate: 1200g

Methyl Cellulose Usage: 5.6g

Polyvinyl Alcohol Consumption: 2.4g

Cement Consumption: 800g

Fly Ash Consumption: 0g (Fly Ash Cement Substitution Rate 0%)

Comparative Example 6

Fine Aggregate: 1200g

Methyl Cellulose Usage: 5.6g

Polyvinyl Alcohol Consumption: 2.4g

Cement Consumption: 760g

Fly Ash Consumption: 40g (5% Cement Replacement Rate of Fly Ash)

Experimental Example 5

Fine Aggregate: 1200g

Methyl Cellulose Usage: 5.6g

Polyvinyl Alcohol Consumption: 2.4g

Cement usage: 744g

Fly Ash Consumption: 56g (7% of cement replacement rate of fly ash)

Experimental Example 6

Fine Aggregate: 1200g

Methyl Cellulose Usage: 5.6g

Polyvinyl Alcohol Consumption: 2.4g

Cement Consumption: 720g

Fly Ash Consumption: 60g (10% cement replacement rate)

Comparative Example 7

Fine Aggregate: 1200g

Methyl Cellulose Usage: 5.6g

Polyvinyl Alcohol Consumption: 2.4g

Cement Usage: 680g

Fly Ash Consumption: 120g (15% of cement replacement rate of fly ash)

Shear strength and flow values were measured for each of the above experimental and comparative examples.

(1) shear strength

As a result of measuring the shear bond strength of Comparative Example 4, Comparative Example 5, Example 5, Example 6 and Comparative Example 6, respectively, 1000 kg / cm 2, 1030 kg / cm 2, 1170 kg / cm 2, 1190kg / cm 2 And 1046 kg / cm 2.

From the above results, it was confirmed that Example 5 and Example 6 corresponding to the tile cement composition of the present invention showed excellent shear adhesive strength, the shear bonding strength is somewhat reduced in Comparative Example 6 in which the amount of fly ash is used It was confirmed that.

(2) flow value

As a result of measuring the flow value, Comparative Example 4, Comparative Example 5, Example 5, Example 6 and Comparative Example 6 were measured to be 13.2 cm, 13.5 cm, 13.8 cm, 13.6 cm and 14.3 cm, respectively.

The flow values of Comparative Example 4, Comparative Example 5, Example 5 and Example 6 were found to be generally appropriate, but in Comparative Example 6, the flow values were excessively undesirable.

As described above in detail, when the cement mortar composition for tile attachment of the present invention is used, the shrinkage phenomenon of the initial curing of the mortar structure, which causes the durability of the existing tile cement, shrinkage phenomenon of the high molecular compound after curing, and repeated wet and dry By improving the expansion and contraction of the mortar tissue, durability could be significantly improved.

In addition, by incorporating fly ash, which is an industrial by-product, it was possible to obtain a cement for attaching tiles with almost no loss in strength compared to existing products and having almost the same workability. In addition, it produced environmentally friendly products by using industrial by-products, and the cost was lower than existing products.

In the above described the configuration and features of the present invention based on the embodiment according to the present invention, the present invention is not limited to this, it is possible to be freely modified according to the technical idea of the present invention.

Claims (5)

In the cement mortar composition for tile attachment composed of cement, inorganic aggregate and admixture, The admixture consists of a mixture of methyl cellulose and polyvinyl alcohol and is added in an amount of 0.8% to 1.0% by weight of the cement of the cement mortar composition. The cement mortar composition for tile mounting, characterized in that the ratio of the amount of methyl cellulose to the amount of the admixture of the sum of the amounts of the methyl cellulose and polyvinyl alcohol in the admixture is 0.6 to 0.8. The method of claim 1, The admixture is added at 0.85% to 0.95% by weight of the cement of the cement mortar composition, The cement mortar composition for tile adhesion, characterized in that the ratio of the amount of methyl cellulose used is 0.7. The method of claim 1, The admixture is added at 0.9% by weight of the cement of the cement mortar composition, The cement mortar composition for a tile attachment, characterized in that the ratio of the amount of methyl cellulose used is 0.7. The method according to any one of claims 1 to 3, Cement mortar composition for tile attachment comprising a fly ash so that the cement replacement rate of the fly ash is 7% to 11%. The method of claim 4, wherein Cement mortar composition for tile attachment comprising a fly ash so that the cement replacement rate of the fly ash is 9% to 10%.