KR101709120B1 - Mortar Composition for Beta Semi Senior High Floor. - Google Patents

Abstract

The present invention relates to a mortar composition for beta hemihydrate gypsum-based floor. In order to be used in one time plastering operations, the mortar composition comprises: beta hemihydrate gypsum, cement, blast furnace water granulated slag micropowder, limestone powder, a plasticizer, a retarder, and sand. Or, for the high flow plastering operations, the mortar composition is able to contain: beta hemihydrate gypsum, cement, blast furnace water granulated slag micropowder, limestone powder, resin powder, the plasticizer, the retarder, a viscosity agent, an antifoaming agent, an accelerating admixture, and sand.

Description

Mortar Composition for Beta Semigloss Base Flooring. {Beta-Hemihydrate Based Floor Screed Mortar Composition}

The present invention relates to a mortar composition for flooring of beta-hemihydrate, which is capable of bottoming only once with a plaster after a pile beam is laid, or a horizontal mortar composition capable of providing excellent horizontal finishing only after light- .

Generally, the existing mortar for the floor of apartment buildings is mainly composed of cement. Background Art [0002] Floor mortars containing such cement as a main component have problems such as cracking due to drying shrinkage, and many studies on new inorganic binders have been carried out in order to replace them.

In addition, clay, gypsum and slaked lime, which were used before cement was used, were used as a substitute for cement substitute inorganic materials. Sand and aggregates were used as a mixture. In addition to research on such alternative materials, Development is underway.

Korean Patent Publication No. 10-0153247 discloses a method of supplying cement self-leveling mortar. Since cement is used as the main material here, cracking problem due to drying shrinkage of cement can not be avoided and blast furnace slag and gypsum are used to prevent cracking but it is insufficient to completely eliminate cracks.

As to the self-leveling mortar composition not using cement, Korean Patent Registration No. 10-0245469 discloses a mortar mortar composition comprising a powder composition composed of loess, lime and bone. Although loess is excellent as an environmentally friendly material, it is weak in predetermined strength and abrasion resistance as a binder and uses burnt lime to prevent cracking due to shrinkage. However, since it has a limitation in suppressing a large drying shrinkage rate of loess, There are disadvantages.

Korean Patent Publication No. 10-0570470 discloses that alpha hemihydrate gypsum is used as a main binder in plaster mortar composition. However, in the case of alpha hemihydrate gypsum, it is expensive because it has to be subjected to a high temperature and high pressure hydrothermal synthesis process, The surface hardness and the strength are lowered by 50% or more owing to the solubility of the gypsum itself.

The present applicant has developed a cement mortar composition for floor including a cement, a gypsum lime accounting crack reducing agent and an alpha hemihydrate in Korean Patent Publication No. 10-1276085. However, since the amount of cement in the mortar composition is larger than that of other components, it is a mortar composition containing cement as a main component, so there is a limit in improving crack resistance and water resistance.

Korean Patent Publication No. 10-0153247 Korean Patent Publication No. 10-0245469 Korean Patent Publication No. 10-0570470 Korean Registered Patent No. 10-1276085

The present invention is to provide a floor mortar which can drastically reduce cracking due to drying and shrinkage of the floor mortar, complete finishing with only a single plaster after the mortar is poured, or can be completed without a trowel finishing finish, The present invention has been made to solve the above-mentioned problems occurring in the prior art.

Further, instead of expensive alpha-hemihydrate gypsum used as a main material of conventional gypsum floor mortar, flue gas desulfurization gypsum, chemical gypsum, or natural gypsum, which are generated as industrial byproducts, In this study, it was found that the existing mortar of cement mortar has cracks and 3 ~ 4 times of finishing trowel finishing work by solving the disadvantages of the process, By improving the workability and quality stability of floor mortar by improving the low surface hardness and water resistance of the gypsum itself, it is possible to dramatically improve the stability of the floor mortar and the high fluidity without material separation, Flowable mortar composition having a good horizontal surface and a gypsum- And that the balls for that purpose.

In order to solve the above-described problems, the present invention provides a mortar composition for use in a high segregation phase of beta-hemihydrate comprising beta-hemihydrate gypsum, cement, fine powder of blast furnace slag, limestone powder, fluidizing agent, retarder and sand, The mortar composition for a senior high ground can be used for a plaster finish.

More specifically, the mortar composition of the present invention comprises 10 to 30 parts by weight of beta hemihydrate, 5 to 15 parts by weight of cement, 5 to 15 parts by weight of fine powdered slag powder, 5 to 20 parts by weight of limestone powder, 0.01 to 0.10 parts by weight, retardant 0.01 to 0.04 parts by weight, and sand 35 to 75 parts by weight.

The mortar composition of the present invention is composed of beta hemihydrate gypsum, cement, fine powder of blast furnace slag, limestone powder, resin powder, fluidizer, retarder, thickener, defoamer, curing accelerator and sand. The above-mentioned beta-semirigid floor mortar composition can be used for high-dynamic-tempering.

More specifically, the mortar composition of the present invention comprises 10 to 30 parts by weight of beta-hemihydrate, 5 to 15 parts by weight of cement, 5 to 15 parts by weight of blast furnace slag fine powder, 5 to 20 parts by weight of limestone powder, 0.01 to 0.30 parts by weight of a defoaming agent, 0.5 to 3.0 parts by weight of a resin powder, 0.1 to 2.0 parts by weight of a curing accelerator, and 35 to 75 parts by weight of a curing accelerator, 0.01 to 0.60 parts by weight of a fluidizing agent, 0.01 to 0.40 parts by weight of retarder, 0.01 to 0.10 parts by weight of a thickener, By weight.

At this time, the beta-hemihydrate gypsum is obtained by heat-treating at least one selected from the group consisting of flue gas desulfurization gypsum, chemical gypsum and natural gypsum, which are produced as industrial byproducts, at 120 to 180 ° C and has a powdery degree of 1,000 to 6,000 cm 2 / g .

In the present invention, the resin powder may be a natural rubber, a nitrile butadiene rubber (NBR), a styrene-butadiene rubber (SBR), a polyvinyl acetate or a vinyl acetate copolymer resin , And the fluidizing agent is a ligninsulfonate compound, a polynaphthalenesulfonate compound, a polymelamine sulfonate compound or a polycarboxylate compound.

The thickening agent may be at least one selected from the group consisting of methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, carboxyethylcellulose, hydroxypropylcellulose and polysaccharide water-soluble polymers, And is characterized by being a glycol type, a mineral oil type, a fat type, a fatty acid type, a fatty acid ester type, an oxyalkylene type, an alcohol type, an amide type, a phosphoric acid ester type, a metal soap type, or a silicone type antifoaming agent.

Since the mortar composition for a gypsum-based truffle floor according to the present invention comprises a beta-hemihydrate gypsum as a main material and a functional admixture for imparting high fluidity in a suitable range, the gypsum-based truffle mortar is produced, It is easy to apply because it is used only by mixing water and kneading.

In addition, it is possible to reduce the generation of cracks, which is a problem of the conventional cement mortar, and to avoid the additional processes such as trowel finishing work for 3 to 4 times, and to efficiently construct the cement mortar. It has an effect of drastically improving workability and quality stability as bottom mortar by improving its low surface hardness and water resistance.

Also, since there is no material separation and high fluidity, it flows freely when casting in the field and has a good horizontal plane, so that the quality and beauty of the bottom plaster can be greatly improved compared with the conventional cement mortar.

The mortar composition of the present invention for beta-hemiporhagic high floor can be prepared for a plaster finish or for non-fermentation.

And more specifically, 10 to 30 parts by weight of beta-hemihydrate gypsum, 5 to 15 parts by weight of cement, 5 to 15 parts by weight of cement, 5 to 15 parts by weight of a blast furnace slag fine powder, 5 to 20 parts by weight of a limestone powder, 0.01 to 0.10 parts by weight of a fluidizing agent, 0.01 to 0.04 parts by weight of a retarder and 35 to 75 parts by weight of sand.

Also, in the case of the high-kinetic durability which can obtain the horizontal plane only by the light subtitle pouring operation immediately after the casting, the beta-hemihydrate gypsum, the cement, the blast furnace slag fine powder, the limestone powder, the resin powder, the fluidizing agent, the retardant, And more specifically, 10 to 30 parts by weight of beta-hemihydrate, 5 to 15 parts by weight of cement, 5 to 15 parts by weight of granulated blast furnace slag, 5 to 20 parts by weight of limestone powder, 0.01 0.01 to 0.30 parts by weight of a thickener, 0.01 to 0.30 parts by weight of a defoaming agent, 0.5 to 3.0 parts by weight of a resin powder, 0.1 to 2.0 parts by weight of a curing accelerator, and 35 to 75 parts by weight of sand .

Also, the beta-hemihydrate gypsum has a particle size distribution of 1,000 to 6,000 cm 2 / g, which is obtained by dry heat-treating at least one selected from flue gas desulfurization gypsum, chemical gypsum and natural gypsum produced as industrial byproducts at 120 to 180 ° C Is used.

Beta hemihydrate gypsum is excellent in quick hardness and dimensional stability, and when it is used as a substrate, it can prevent cracking and peeling due to drying shrinkage, which is a problem of conventional mortar for cement flooring, from the viewpoint of materials, The time can be shortened.

Therefore, the beta-semirigid floor mortar composition of the present invention is derived from the characteristics of such beta-hemihydrate gypsum, and it is preferable to use 10-30 parts by weight of beta-hemihydrate gypsum in the composition. That is, if it is 10 parts by weight or less, cracking occurrence suppressing effect and fast curing rate due to drying shrinkage can not be obtained, and if it is 30 parts by weight or more, there is a fear of decrease in strength development due to expansion and overexpansion due to self-

Beta hemihydrate gypsum will expand about 0.4% during curing. Techniques to minimize this expansion are very important for floor mortars.

In order to suppress expansion due to crystal growth during gypsum hydration, a cement and blast furnace slag fine powder may be added. The cement and blast furnace slag fine powder have the effect of improving the low surface hardness and strength of beta gypsum and improving the water resistance.

The optimum level of the cement and blast furnace slag fine powder in the present invention is preferably 5 to 15 parts by weight each. If the amount is more than the above range, the strength is improved but the effect of crack control due to drying shrinks rapidly. Therefore, it is preferable to add at a level as shown in the present invention.

The above-mentioned cement may be Portland cement first grade cement, DENKA super cement or a mixture thereof. When using ultra rapid cement, a proper amount of calcium sulfoaluminate pulverized into a Portland cement component can be appropriately added to maintain a proper curing time, thereby exhibiting a high initial strength value.

In addition, when using a cement mixture, the Portland cement and the quick-speed cement can be mixed with each other at a ratio of 0.5 to 2: 8 to 9.5 to ensure economical and physical properties.

When the amount of the cement is less than 5 parts by weight, the initial strength is lowered and the adhesive strength is lowered. When the amount of the cement is more than 15 parts by weight, curing is too rapid and hydration heat is generated. It is preferable to use it within the above-mentioned range because there is a problem of crack generation.

The fine blast furnace slag fine powder has latent hydraulic properties, which improves workability and high powderiness, and serves to make the structure more dense. It does not generate hydration heat and is effective for hydration heat reduction. The blast furnace slag fine powder is used in an amount of 5 to 15 parts by weight. If the blast furnace slag powder is used in an amount of less than 5 parts by weight, the effect of reducing the heat of hydration decreases sharply. If the blast furnace slag powder is more than 15 parts by weight, Therefore, it is preferable to use within the above-mentioned range.

In order to improve the surface hardness and abrasion resistance of the gypsum flooring mortar and to exhibit resistance to material separation and excellent adhesion even when the mortar is appropriately viscous, natural rubber, NBR (Nitrile Butadiene rubber, SBR (styrene-butadiene rubber), polyvinyl acetate, or vinyl acetate copolymer dispersed resin powder.

The vinyl acetate-based copolymerization-type resin powder is preferably an ethylene vinyl acetate (EVA) copolymerizable resin-dispersed resin powder.

The appropriate level of the resin powder in the present invention is preferably 0.5 to 3.0 parts by weight. When the resin powder is added in an amount of 0.5 parts by weight or less, the above resin characteristics in the mortar can not be sufficiently exhibited. When the amount exceeds 3.0 parts by weight, the compressive strength of the mortar is lowered and a thick film is formed on the surface of the mortar. It is preferable to add it to the level as proposed in the present invention.

As the fluidizing agent for imparting high fluidity for excellent horizontal finish in addition to the added vinyl acetate copolymer type resinous dispersion resin powder, there can be used conventional dispersing agents such as a ligninsulfonate compound, a polynaphthalenesulfonate compound, a polymelamine sulfonate compound or a polycarboxylate A compound or the like may be used. However, since the ligninsulfonate has a problem of excessive retardation, the polynaphthalenesulfonate has a large fluidity loss, and the polymelamine sulfonate has a problem of indoor air pollution caused by the formaldehyde emission. Therefore, in the present invention, A carboxylate dispersant is selected and used.

The fluidizing agent used in the present invention is used to increase the fluidity of the mortar composition to ensure the required workability and leveling. In the case of one-time finishing, 0.01 to 0.10 part by weight is used, It is preferably used in an amount of 0.01 to 0.60 parts by weight. If the fluidizing agent is excessively out of the above range, it is not economical to increase the fluidity as much as compared with the amount used, and it is preferable to add the fluidizing agent at the level as proposed in the present invention because it may cause bleeding, material separation and excessive condensation retardation .

In the present invention, the antifoaming agent is added when it is used for non-ferrous metal. It is used to smooth the strength and surface texture of the mortar by removing macropores in the floor mortar. Examples of antifoaming agents include polyglycol antifoaming agents, mineral oil antifoaming agents such as kerosene and liquid paraffin, antifoaming agents such as animal and vegetable oils, sesame oil, castor oils and their alkylene oxide adducts, oleic acid, stearic acid and alkylene oxide adducts thereof Fatty acid defoaming agents such as glycerin monolaurinolate, alkenyl succinic acid liquid, sorbitol monolaurate, sorbitol trioleate, natural wax and the like, fatty acid ester defoaming agents such as polyoxyalkylene, polyoxyalkyl ether, acetylene ether, Polyoxyalkylene sorbitan fatty acid esters, polyoxyalkylene alkyl (aryl) ether sulfuric ester salts, polyoxyalkylene alkyl phosphoric acid esters, polyoxyalkylene alkylamines, polyoxyalkylene amides, etc. An oxyalkylene antifoaming agent, an alcohol type antifoaming agent such as octyl alcohol, hexadecyl alcohol, acetylene alcohol and glycol, Amide-based antifoaming agents such as polyvinyl pyrrolidone, polyvinyl pyrrolidone, and acrylate polyamines; phosphate ester type antifoaming agents such as tributylphosphate and sodium octylphosphate; metal soap type antifoaming agents such as aluminum stearate and calcium oleate; or silicone silicone oils such as silicone silicone oil, silicone emulsion, Silicone defoaming agents such as polysiloxane and fluorosilicone oil, and the like can be used.

In the present invention, a polyglycol-based defoaming agent in the form of a powder is used, and it is preferable to use 0.01-0.30 parts by weight as an appropriate level for use. When the amount of the defoaming agent is less than 0.01 part by weight, defoaming of bubbles introduced into the mortar is insufficient, resulting in reduction in strength and pinhole phenomenon due to surface bubble marks. When the amount of the defoaming agent is more than 0.30 parts by weight, It is preferable to add it at the level as proposed in the present invention.

Also, the retarder used in the present invention is added in order to delay workability of the beta hemihydrate gypsum and ensure workability for a certain period of time. Examples of the retarder include a polyoxymethylene amino acid copolymer; Oxycarboxylic acids such as gluconic acid, citric acid, tartaric acid, gluconic acid, arabic acid, malic acid or citric acid and inorganic or organic salts thereof such as sodium, potassium, calcium, magnesium, ammonium and triethanolamine; Oligosaccharides such as glucose, fructose, galactose, saccharose, xylose, avitose, liposome and isomerized sugar, oligosaccharides such as 2 sugars and 3 sugars, oligosaccharides such as dextrin and polysaccharides such as dextran and the like Saccharides such as molasses; Sugar alcohols such as sorbitol; Magnesium styrenesulfonate; Phosphoric acid and its salts; Boric acid esters; Aminocarboxylic acids and their salts; Alkali-soluble proteins; Fumic acid; Tannic acid; phenol; Polyhydric alcohols such as glycerin; (Methylenephosphonic acid), an alkali metal salt thereof, an alkali metal salt of an alkali thereof, an alkali metal salt thereof, And phosphonic acids and derivatives thereof such as earth metal salts.

In the present invention, a citric acid retarder is selectively used. It is preferable to use 0.01 to 0.04 parts by weight in case of one-time finishing and 0.01 to 0.40 parts by weight in case of non-fermentation. The addition amount of the retarder varies depending on the degree of powder and reactivity of the beta hemihydrate gypsum, and the addition amount of the retarder increases with the degree of powderiness and reactivity. If the addition amount of the retarder is excessively large, the material separation and the strength decrease are greatly affected. Therefore, it is preferable to add the retarder at the level as proposed in the present invention.

In addition, in the case of non-fermentation, a thickening agent is added to the material for the separation stability of the material for the beta-hemihydrate base floor mortar, and as the thickening agent, methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, Non-ionic cellulose ethers such as cellulose and hydroxypropyl cellulose, polysaccharide water-soluble polymers and the like can be used. In the present invention, it is possible to use water-soluble polymers having a molecular weight suitable for maintaining the material separation stability without deteriorating the horizontality and workability of the mortar A hydroxyethyl cellulose thickener was used.

The suitable level of the thickener is preferably 0.01 to 0.10 part by weight. When the amount of the thickener is less than 0.01 parts by weight, the separation of the gypsum-based toughened floor mortar having high fluidity characteristics can not be prevented. When the amount exceeds 0.10 parts by weight, the viscosity of the mortar becomes excessively high, It is preferable to add it to the level as proposed in the present invention.

In the present invention, it is preferable to use 35 to 75 parts by weight of sand. Since the sand is uniformly dispersed in the mortar composition to obtain sufficient strength and evenness, the present invention uses sand having a particle size of 5.6 mm or less. If the particle size is too large beyond the above range, the strength of the mortar is lowered and the surface roughness is increased.

As a material that can be supplementarily added to improve the functionality of the beta-alumina base mortar, a hardening accelerator such as alkali sulfate, a rust inhibitor, a colorant, a water repellent agent, an antibacterial agent or an antifungal agent may be added. In the case of the curing accelerator, it is added to the flavor-reducing agent, and is suitably used in the range of 0.1 to 2.0 parts by weight.

The Beta semi-rigid base mortar mixed with the above-mentioned materials at a ratio as shown in the above is less cracking and appearance than the cement mortar and has a faster initial curing rate, which can shorten the curing period required for the subsequent process Lt; / RTI >

The following examples illustrate the invention, but are for the purpose of illustration and not of limitation of the scope of the invention.

5,900 kg of sand having a particle size of 5.6 mm or less was mixed with 15.00 kg of beta-hemihydrate gypsum, 10,00 kg of cement, 15.00 kg of blast furnace slag fine powder, 5.00 kg of limestone fine powder, 0.03 kg of polycarboxylate fluidizing agent, The mortar for the one - time finishing finishing of Beta semi - rigid base was prepared.

30.00 kg of beta hemihydrate gypsum, 5.00 kg of cement, 5.00 kg of blast furnace slag fine powder, 20.00 kg of limestone fine powder, 0.60 kg of polycarboxylate fluidizing agent, 0.40 kg of citric acid retarder, 0.01 kg of hydroxyethylcellulose thickener, 0.30 kg of polyglycol defoamer , 0.50 kg of vinyl acetate redistribution resin powder and 0.10 kg of alkali sulfate curing accelerator were mixed with 38.09 kg of sand having a particle size of 5.6 mm or less to prepare a mortar for a high boiling point beta semi-

10.0 kg of granulated fine powder of limestone, 0.30 kg of polycarboxylate fluidizing agent, 0.20 kg of citric acid retarder, 0.05 kg of hydroxyethylcellulose thickener, 0.15 kg of polyglycol defoamer , 1.50 kg of vinyl acetate redistribution resin powder, and 1.00 kg of alkali sulfate curing accelerator were mixed with 46.80 kg of sand having a particle size of 5.6 mm or less to prepare a beta-semirigid floor mortar for high dynamic damping use.

Beta-hemihydrate plaster 10.00 kg, cement 15.00 kg, blast furnace slag fine powder 15.00 kg, limestone fine powder 5.00 kg, polycarboxylate fluidizing agent 0.01 kg, citric acid retarder 0.01 kg, hydroxyethylcellulose thickener 0.10 kg, polyglycol defoaming agent 0.01 kg , 3.00 kg of vinyl acetate redistribution resin powder, and 2.00 kg of alkali sulfate curing accelerator were mixed with 49.87 kg of sand having a particle size of 5.6 mm or less to prepare a beta-semirigid floor mortar for high dynamic damping.

[Comparative Examples 1 to 4]

For comparison with the examples within the range of addition of the admixture proposed in the present invention, in Comparative Example 1, the compounding properties were compared by applying alpha hemihydrate gypsum used as a binder to the existing gypsum floor mortar. In Comparative Example 2, The cement mortar for general use in Comparative Examples 3 to 4 was prepared, and the mortar of Beta semi-rigid base of Examples 1 to 3 and the mortar for properties .

Table 1 below shows the formulation table for Examples and Comparative Examples of the present invention.

division beta
Half plaster Alpha Half Plaster cement Slag
powder Limestone
powder Fluidizing agent Retarder Thickener Defoamer powder
Suzy Hardening
accelerant sand Example 1 30.00 5.00 5.00 20.00 0.60 0.40 0.01 0.30 0.50 0.10 38.09 Example 2 20.00 10.00 10.00 10.00 0.30 0.20 0.05 0.15 1.50 1.00 46.80 Example 3 10.00 15.00 15.00 5.00 0.01 0.01 0.10 0.01 3.00 2.00 49.87 Comparative Example 1 - 30.00 - - 20.00 0.60 0.10 0.01 0.30 0.50 - 48.49 Comparative Example 2 15.00 15.00 - - 20.00 0.60 0.10 0.01 0.30 0.50 - 48,49 Comparative Example 3 - 25.00 - 5.00 - - - - - - 60.00 Comparative Example 4 - 20.00 5.00 5.00 - - - - - - 60.00

The physical properties of the above examples and comparative examples are shown in Table 2. The properties of the mortar were measured as follows.

The mortar was mixed with 20% by weight of water based on the total mortar according to the mechanical mixing method of hydraulic cement paste and mortar of KS L 5109. The fluidity test was carried out by mixing 30 mm of glass on the glass plate with 50 mm inner diameter and 50 mm height The PVC tube was placed on a glass plate and filled with water mixed with mortar to measure the size of the spreading diameter when it was lifted up vertically. The measurement was made at 0, 15, and 30 minutes after elapse of the bib mortar.

The coagulation time of the mortar was measured according to the concrete aging time test method using the penetration resistance of KS F 2436. The length change experiment was carried out using 10 ㎝ (W) ㎝ (H) ㎝ D) mold, the change in length over 28 days was measured under a curing condition of a standard temperature of 20 ° C and a humidity of 65%. The cement mortar compression strength was obtained by filling the bimetal mortar of 4 cm ㎝ in the curing condition with the bimetal mortar in the curing condition for 1 day, demolding it in the mold, and setting the temperature at 20 캜 and 65% The compressive strength of the mortar was measured during the curing period of 3, 7, and 28 days of age. On the other hand, to confirm the water resistance of the mortar, the specimens after 28 days of curing were immersed for 28 days in a water curing tank at a water temperature of 20 ° C, and the compressive strength of the mortar in water was measured.

division
Quantity of water
(%)
Flow value
(mm) material
detach
/
Bleeding
congelation
(minute) Length
change
(%)
Municipal curing
Compressive strength
(MPa) Immersion in water
Compressive strength
(MPa) 0 minutes 15 minutes 30 minutes Fresh closing 3 days 7 days 28th 28th Example 1 20 215 205 202 none 95 125 -0.011 7.1 10.1 20.8 20.5 Example 2 20 208 198 190 none 110 145 -0.014 7.8 12.0 21.5 21.1 Example 3 20 201 192 185 none 130 185 -0.025 8.9 12.3 24.6 23.2 Comparative Example 1 20 209 197 187 none 105 128 0.270 8.2 11.0 20.7 9.2 Comparative Example 2 20 208 196 185 none 106 130 0.250 8.4 12.5 21.9 9.0 Comparative Example 3 20 101 92 75 has exist 410 530 -0.087 6.1 10.2 16.5 18.7 Comparative Example 4 20 105 94 81 has exist 450 610 -0.095 5.2 9.1 17.1 19.5

The physical properties of the beta-semirigid floor mortar of Examples 1 to 4 were compared with those of the mortar for alpha-hemiporous gypsum flooring of Comparative Example 1, the alpha hemihydrate-beta hemihydrate gypsum mixed gypsum flooring mortar of Comparative Example 2, 4 showed that the flow rate of the mortar with horizontal finishing ability is more than 2 times higher than that of the cement mortar. No bleeding phenomenon occurred.

In addition, in order to examine the effect of the crack control by the drying shrinkage of the mortar for floor, Comparative Example 1 showed a problem of over-expansion of about 0.27% due to the self-expandability of the alpha-hemihydrate gypsum in Comparative Example 1, The inventors of the present invention have found that the inventive blend of beta -based gypsum, cement and slag powder in Examples 1 to 4 exhibits a stable length change of about 0.025% or less, Shrinkage length variation of about 1/8 to 1/5 of that of the cement mortar for flooring of cement mortar of 2 to 3.

Compared with the cement mortars of Comparative Examples 3 to 4, Examples 1 to 4 show high compressive strength results. In the case of underwater soaking compressive strength for water resistance confirmation, the mortar of the floor using the alpha hemihydrate of Comparative Example 1 Showed that the compressive strength was greatly decreased by 50% or more due to the solubility of the hardened gypsum, whereas the compressive strength was maintained in Examples 1 to 4.

Therefore, in the present invention, it is confirmed that the combination of beta-hemihydrate gypsum, cement and slag fine powder suppresses the expansion during curing of the beta hemihydrate gypsum to a minimum and shows a better effect than a mortar composition using a conventional mortar composition or alpha hemihydrate gypsum I could.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken in conjunction with the present invention. Variations and changes are possible. Such variations and modifications are to be considered as falling within the scope of the invention and the appended claims.

Claims (9)

In a mortar composition for a beta semi-
5 to 15 parts by weight of a blast furnace slag fine powder, 5 to 20 parts by weight of a limestone powder, 0.01 to 0.10 parts by weight of a fluidizing agent, 0.01 to 0.04 parts by weight of a retarder, 35 to 75 parts by weight of sand,
Wherein the mortar composition for beta-semirigid flooring is used for a one-time mortar finish.
In a mortar composition for a beta semi-
5 to 15 parts by weight of a blast furnace slag fine powder, 5 to 20 parts by weight of a limestone powder, 0.01 to 0.60 parts by weight of a fluidizing agent, 0.01 to 0.40 parts by weight of a retarder, 0.01 to 0.10 parts by weight of a thickener, 0.01 to 0.30 parts by weight of a defoaming agent, 0.5 to 3.0 parts by weight of a resin powder, 0.1 to 2.0 parts by weight of a curing accelerator and 35 to 75 parts by weight of sand,
Wherein the mortar composition for beta-semirigid flooring is used for high-dynamic-tolerance mortar composition.
delete delete The method according to claim 1 or 2,
The beta-hemihydrate gypsum is obtained by heat-treating at least one selected from the group consisting of flue gas desulfurization gypsum, chemical gypsum and natural gypsum, which are produced as industrial byproducts, at 120 to 180 ° C, and has a powdery degree of 1,000 to 6,000 cm 2 / g Mortar Composition for Beta Semi Senior High Floor.
The method of claim 2,
Wherein the resin powder is a resin powder of a natural rubber type, NBR (Nitrile Butadiene Rubber) type, SBR (Styrene-Butadiene Rubber) type, polyvinyl acetate type, or vinyl acetate type copolymerization type dispersing type resin. Composition.
The method according to claim 1 or 2,
Wherein the fluidizing agent is a lignin sulfonate compound, a polynaphthalene sulfonate compound, a polymelamine sulfonate compound, or a polycarboxylate compound.
The method of claim 2,
Wherein the thickening agent is at least one selected from methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, hydroxypropyl cellulose and polysaccharide water-soluble polymers. Floor mortar composition.
The method of claim 2,
Wherein the antifoaming agent is at least one selected from the group consisting of polyglycol, mineral oil, fats, fatty acid, fatty acid ester, oxyalkylene, alcohol, amide, phosphate ester, metal soap, Floor mortar composition.