KR102351964B1 - A cement composition having oyster shell and panel, flooring and reinforced block for construction having oyster manufacturing thereof - Google Patents

Abstract

According to the present invention, a panel and a flooring for construction include oyster shells showing a variety of colors when a composition including cement is manufactured so as to express a beautiful appearance and simultaneously improve mechanical properties such as compression strength and the like and chemical properties such as an antibacterial effect. In addition, the panel for construction and the like can obtain sufficient strength to be thinly manufactured and irregular and various patterns can be expressed so as to express beautiful building exteriors and interiors and to maintain expression of these patterns even after long-term use.

Description

A cement composition comprising oyster shells and a building panel, flooring and reinforcing earth block comprising oyster shells manufactured therefrom

The present invention relates to a cement composition comprising oyster shells, and to a building panel, flooring and reinforcing earth block comprising oyster shells prepared therefrom, and more particularly, oyster shells capable of exhibiting various colors in a cement composition for manufacturing a building panel, etc. Cement composition containing oyster shell, which can produce a beautiful appearance by including, and at the same time improve mechanical properties such as compressive strength and chemical properties such as antibacterial effect It's about blocks.

Oyster farming in the southern and western seas of Korea has become a major source of income for fishermen in Juju, and a smooth supply of domestic oyster demand. However, most of the cultured oysters are sold only after the shell is removed, and the discarded oyster shells remain as waste. 250,000 to 300,000 tons of these oyster shells are discharged every year, and they are emerging as major sources of marine and residential pollution.

Oyster shells are classified as general waste and should be disposed of by farmed fishermen, but effective disposal is impossible due to problems such as securing a landfill site, and collecting and transporting shells. It has a major impact on coastal pollution.

The composition of oyster shells is slightly different depending on the culture method and the length of storage, but calcium carbonate is about 95% by weight (wt%), and the rest is composed of organic substances such as protein, fat, and chitin. Chitin is a major component of the exoskeleton of crustaceans and is a type of mucopolysaccharide in which N-Acetyl-D-glucosamine is combined with β-1, 4, and when this chitin is deacetylated, chitosan is produced. do. These chitin and chitosan are not only non-toxic, but also are natural polymeric cations that do not cause environmental pollution by participating in the synthesis and decomposition of organisms. Recently, these materials have been widely used in various industrial fields such as environmental wastewater flocculants, heavy metal adsorbents, and protein recovery agents as potential user resources. In addition, the function as a natural antibacterial agent using chitin and chitosan derivatives is also emerging as one of the applications of chitosan. In this regard, Sudarshan et al. reported that chitosan lactate and chitosan hydroglutamate, which are chitosan derivatives, are excellent antimicrobial substances against general E. coli.

However, despite having the above-mentioned excellent characteristics, there was a problem that the above-mentioned oyster shells were not used properly due to excessive processing cost according to volume or weight and low processing efficiency.

Republic of Korea Patent Publication No. 10-2015-0080890 (July 10, 2015)

The present invention has been devised to solve the above problems, and specifically, by including oyster shells that can show various colors in a cement composition for manufacturing a building panel, etc., a beautiful appearance can be produced, and at the same time, such as compressive strength, etc. An object of the present invention is to provide a cement composition containing oyster shells capable of simultaneously improving mechanical properties and chemical properties such as antibacterial effects, and a building panel, flooring material and reinforcing earth block including oyster shells prepared therefrom.

The present invention relates to a cement composition comprising oyster shells, and to a building panel, flooring and reinforcing earth blocks comprising oyster shells prepared therefrom.

One aspect of the present invention is an oyster shell comprising 10 to 40% by weight of oyster shell, 20 to 50% by weight of cement, 0.1 to 5% by weight of fiber reinforcing agent, 0.1 to 5% by weight of reinforcing agent, and 20 to 50% by weight of dolomite It relates to a cement composition comprising.

In the present invention, the oyster shell is pre-treated by immersing in an aqueous solution in which any one or a plurality of basic substances selected from sodium hydroxide, calcium hydroxide, aluminum hydroxide, potassium hydroxide, magnesium hydroxide, sodium hydrogen carbonate and ammonia are dissolved.

In addition, the fiber reinforcing agent is any one or more selected from glass fiber, basalt fiber, carbon fiber, cellulose fiber, polyethylene fiber, polyamide fiber, polyester fiber and metal fiber, and the reinforcing agent is lignylsulfonic acid, oxycarboxylic acid It is characterized in that it contains any one or a plurality of air entraining agents selected from salts, alkylarylsulfonates, melaminesulfonates, polycarboxylates, polycarboxylic acids and polyol derivatives.

In addition, the dolomite is 40 to 70% by weight of calcium oxide; 20 to 40% by weight of activated magnesia; and 10 to 20 wt% of any one selected from silicon dioxide, dialuminum trioxide, ferric trioxide, and sulfur trioxide, or a mixture thereof, wherein the cement composition comprises a viscosity modifier, a flame retardant, a waterproofing agent, silica fume, geothermal silica, a thickener, a pigment, It is characterized in that it further comprises any one or a plurality of additives selected from a colorant, a plasticizer, a dispersant, a molding agent, a coagulant, a drainage aid, and a strength aid.

Another aspect of the present invention relates to a building panel and a flooring material comprising oyster shells prepared by curing and demolding the cement composition containing oyster shells as described above.

The building panel, flooring and reinforcing earth block according to the present invention can produce a beautiful appearance by including oyster shells that can exhibit various colors when manufacturing a composition containing cement, and at the same time, mechanical properties such as compressive strength and chemical properties such as antibacterial effect can be improved at the same time.

In addition, the building panel, flooring, and reinforcing earth block can be manufactured thinly because they can secure sufficient strength, and at the same time, irregular and various patterns can be expressed, so that beautiful building exteriors and interiors can be expressed. Expression may persist.

Hereinafter, the cement composition containing the oyster shell according to the present invention and the building panel, the flooring material and the reinforcing earth block including the oyster shell prepared therefrom will be described in more detail by way of Examples and Comparative Examples. However, the embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art.

Therefore, the present invention is not limited to the embodiments presented below and may be embodied in other forms, and the embodiments presented below are only described to clarify the spirit of the present invention, and the present invention is not limited thereto.

At this time, unless there are other definitions in the technical terms and scientific terms used, it has a meaning commonly understood by a person of ordinary skill in the art to which this invention belongs, and in the following description, it may unnecessarily obscure the subject matter of the present invention. A description of possible known functions and configurations will be omitted.

Also, the singular forms used in the specification and appended claims may also be intended to include the plural forms unless the context specifically dictates otherwise.

In addition, the drawings introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art. Therefore, the present invention is not limited to the drawings presented below and may be embodied in other forms, and the drawings presented below may be exaggerated to clarify the spirit of the present invention. Also, like reference numerals refer to like elements throughout.

Also, the singular forms used in the specification and appended claims may also be intended to include the plural forms unless the context specifically dictates otherwise.

In describing the components of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is formed between each component. It should be understood that elements may also be “connected,” “coupled,” or “connected.”

The present invention relates to a cement composition comprising oyster shells, which basically replaces some of the cement occupying most of the cement composition with oyster shells. In the case of manufacturing architectural panels, including building panels, it gives aesthetic impression to users and at the same time achieves mechanical properties such as tensile strength, rupture strength, and flexural strength of architectural panels, etc. .

In the present invention, the cement composition is characterized by comprising oyster shells and cement as a base, and fiber reinforcing agents, reinforcing agents, dolomite and other additives.

In the present invention, the oyster shell means the shell of oysters, and about 240,000 tons are generated every year in the southern coast alone, of which about 25%, or about 60,000 tons, is reported to be recycled as oyster seedlings or fossil fertilizer. Since 2011, it has been virtually stopped due to the excess processing capacity of the fertilizer processing companies using shells as raw materials. Also, considering that there are several types of shells produced in Korea other than oysters and cockle, it is expected that the actual amount of shells produced will be difficult to count.

However, natural shells contain calcium carbonate (CaCO ₃ ) as the main component and have been used in small amounts as fertilizers and feeds since ancient times. . In addition, the oyster shell contains phosphorus and calcium, so when it is mixed with other ingredients, especially cement, it produces calcium phosphate like human bones and has very high strength. cracks can be prevented.

Here, the composition of oyster shells is slightly different depending on the culture method and the length of storage, but calcium carbonate is about 95 weight percent (wt%), and the rest is composed of organic substances such as protein, fat, and chitin in addition to the phosphorus mentioned above. Chitin is a major component of the exoskeleton of crustaceans and is a type of mucopolysaccharide in which N-Acetyl-D-glucosamine is combined with β-1, 4, and when this chitin is deacetylated, chitosan is produced. do. These chitin and chitosan are not only non-toxic, but also are natural polymeric cations that do not cause environmental pollution by participating in the synthesis and decomposition of organisms. Recently, these materials have been widely used in various industrial fields such as environmental wastewater flocculants, heavy metal adsorbents, and protein recovery agents as potential user resources. In addition, the function as a natural antibacterial agent using chitin and chitosan derivatives is also emerging as one of the applications of chitosan. In this regard, Sudarshan et al. reported that chitosan lactate and chitosan hydroglutamate, which are chitosan derivatives, are excellent antibacterial substances against general E. coli.

The present invention, paying attention to the advantages of oyster shells as described above, discovered that when organic matter was first removed from oyster shells and the remaining components were modified and mixed with cement, the strength of the cement after curing and antibacterial and antifungal functions were expressed. invention was completed.

In the present invention, the oyster shells are added in the form of powder, but it is preferable to remove the organic matter and salt attached to the surface as described above. At this time, the oyster shells are first immersed in a water tank containing distilled water for 4 to 6 hours and taken out by repeating the operation 2 to 3 times to completely remove the salt, and then immersed in an aqueous solution of a basic substance again to remove organic matter on the surface, especially protein. do.

In the present invention, the basic material is not limited to a type as long as it can dissolve proteins, for example, sodium hydroxide, calcium hydroxide, aluminum hydroxide, potassium hydroxide, magnesium hydroxide, sodium hydrogen carbonate and ammonia, etc., and these are alone or Two or more can be mixed and used.

The basic material is preferably mixed with water to a concentration of 1 to 10% by weight, and then immersed in the water. At this time, the oyster shells are preferably finely pulverized using a pulverizing means such as a planetary mill to increase the protein dissolution effect. In addition, the basic substance solution is preferably stirred for 1 to 5 hours at 50 to 200 rpm at 80 to 100 ℃ after adding the powder of oyster shell.

In addition, the oyster shell is 80 to 120 parts by weight in 100 parts by weight of 30 to 40% by weight hydrochloric acid, 60 to 80 parts by weight to 100 parts by weight of 60 to 65% by weight nitric acid, and 100 parts by weight of a mixed inorganic acid of hydrochloric acid and nitric acid after the removal of the protein It is preferable to add 60 to 100 parts by weight slowly while stirring and then neutralize the mixture by shaking and dissolving for 12 to 36 hours.

In addition, it is preferable to modify the surface of the oyster shell with a hydrophobic material in order to further increase mechanical properties by suppressing structural changes during the hydration reaction of cement.

In general, oyster shells contain a large amount of chitosan, and the chitosan is produced by hydrolysis of chitin derived from shellfish in nature, and is a water-soluble polymer with a positive charge, and has the advantage of adsorbing physiologically active substances. . However, due to the hydration phenomenon of chitosan, the structure of the three-dimensional structure changes in the aqueous solution phase, which has the disadvantage of acting as a crack inside the cement. To solve this, the surface is modified with a hydrophobic component.

The hydrophobic modification of the chitosan is _{to induce hydrophobicity by introducing another molecule to an amine group (-NH 2} ) expressing hydrophilicity, in this case, the molecule does not limit the molecular weight, but a biodegradable polymer so that it can be appropriately decomposed as needed It is preferable to be

Examples of the biodegradable polymer include poly-lactide-co-glycolide (PLGA, Poly(lactide-co-glycolide)), polyglycolide (PGA, Poly(Glycolic acid)), polylactide (PLA, Poly (Lactic acid)) and polycaprolactone (PCL, Poly(Caprolactone)), etc., which may be used alone or two or more, and the molecular weight is also not limited, but preferably 500 to 1,000 based on the weight average molecular weight.

The modification of the chitosan is mixed with 50 to 200 parts by weight of the biodegradable polymer based on 100 parts by weight of the oyster shell powder, and at this time, DMF (dimethylformamide), DMSO (dimethylsulfoxide), dichloromethane, and an organic solvent such as dichloromethane. The reforming can be carried out by allowing it to stand for 1 to 7 days.

In the present invention, the oyster shell is preferably included in an amount of 10 to 40% by weight of the total cement composition. When added below the above range, the mechanical properties and antibacterial properties of the cement are not properly expressed.

In the present invention, the cement is not limited to the type as long as it is included in mortar or concrete in the art, and preferably general Portland cement, crude steel portland cement, early steel Portland cement, medium heat Portland cement, sulfate-resistant Portland cement, or white Portland cement. Any one or a mixture of cement and super-velocity cement may be used, but the present invention is not limited thereto, and not only cement powder form but also clinker form may be used. However, when using cement clinker, it is preferable to use the one that has been calcined and pulverized as a pretreatment. The specific surface area of the cement ^{is preferably 2,000 cm 2} /g to 8,000 cm ² /g.

More preferably, Portland cement is used as the cement. The Portland cement has a low silicic acid content, a high content of lime powder, 2 lime silicate, and 3 lime silicate, and has an advantage in that it generates a lot of heat during setting, but has a large early strength.

Specifically, the Portland cement is a _{calcium silicate compound such as tricalcium silicate (Alite, C 3} S), dicalcium silicate (Belite, C ₂ S), tricalcium aluminate (aluminate phase, C ₃ A), iron aluminate It is composed of interstitial phase compounds such as calcium (ferrite phase, C ₄ AF) and various slags, and is usually used in the art. Cement or sulfate-resistant Portland cement can be used.

The cement is preferably included in an amount of 20 to 50% by weight of the total composition. When added below the above range, the mechanical properties of the finished panel may be reduced, and if it exceeds the above range, the amount of other compositions added may decrease, so that the above-described antibacterial properties may not be properly expressed.

In the present invention, the fiber reinforcing agent is added to improve the tensile force or flexural strength due to the stress applied in the longitudinal or transverse direction of the panel to be manufactured and to reduce the weight, and any fiber having the above purpose may be used. .

Examples of the above fibers may include glass fibers, basalt fibers, carbon fibers, cellulose fibers, polyethylene fibers, polyamide fibers, polyester fibers and metal fibers, and these are used alone or in mixture of two or more. also good

In particular, among the fibers, glass fiber and basalt fiber are amorphous materials containing silica as a main component, and have similar chemical properties, high strength, and high heat resistance, and basalt fiber has high acid resistance, electrical insulation, and workability. has a high advantage.

In addition, among the above fibers, polyamide fibers are precisely aromatic polyamide fibers (aramid fibers), and because they have an aromatic ring in the main chain, they have high heat resistance, impact resistance, and chemical resistance, and mechanical properties such as tensile strength and elongation at break are excellent. It has excellent advantages.

The fiber reinforcing agent has a single shape, and the length thereof is 1 to 100 mm, preferably 3 to 40 mm, and the diameter or thickness of the cross section is preferably 1 to 50 µm, preferably 10 to 40 µm. Within the above range, the panel's quality, durability, and properties such as tensile strength, flexural strength and toughness can be adjusted to an optimal range.

The fiber reinforcing agent is preferably added in an amount of 0.1 to 5% by weight of the total cement composition. When added below the above range, the mechanical properties of the panel may decrease, and when it exceeds the above range, the fiber reinforcing agent may act as a crack in the panel due to a decrease in the amount of other components, particularly cement, added.

In the present invention, the reinforcing agent is basically called an AE (air-entraining admixtures, air entraining agent) agent, and is used for the purpose of increasing the resistance to the freezing and thawing action of cement, and means a surfactant with high foaming properties. The AE agent is activated by heat or moisture inside the poured concrete or mortar, generates gas such as carbon dioxide and hydrogen to evenly generate independent bubbles, and can increase corrosion resistance and freeze-thaw resistance. In addition, there is an additional effect of improving workability and watertightness by improving fluidity.

Examples of the AE agent include lignylsulfonic acid, oxycarboxylate, alkylarylsulfonate, melaminesulfonate, polycarboxylate, polycarboxylic acid, and polyol derivatives. Specifically, hydrazine , hydrazide, azide, azo composition, azodicarboamide, toluene sulfonylhydrazide, benzene sulfonylhydrazide , Nitrogen gas generation such as toluene sulfonyl acetone hydrezone, toluene sulfonyl semicarbazide, phenyltetrazole, dinitrosopentamethylenetetramine, etc. compound, hydrogen gas generating compound such as sodium borohydrazide, oxygen gas generating compound such as organic peroxide and inorganic peroxide, carbon dioxide generating compound such as sodium bicarbonate, alkali carbonate, alkaline earth carbonate, polycarboxylic acid system, activated carbon, and the like. In addition, only a single type of the AE agent may be used, but two or more types of substances may be mixed and used.

In the present invention, the reinforcing agent is preferably added in an amount of 0.1 to 5% by weight of the total cement composition. When added below the above range, the increase in corrosion resistance or freeze-thaw resistance is insignificant, and when it exceeds the above range, the viscosity of the composition is excessively decreased, and workability or watertightness may be greatly reduced.

In the present invention, the dolomite is also called dolomite stone, and is a sedimentary carbonate composed of _{crystalline calcium magnesium carbonate CaMg(CO 3} ) _{2 .} It is used for many purposes as refractory materials, glass, steelmaking, fertilizers, aggregates, fillers, etc. In particular, light burned dolomite produced by calcining the dolomite acts as a crack reducing agent and has the effect of further enhancing mechanical properties.

In the present invention, the dolomite can be used by itself, but it is preferable to use it after calcining in order to further improve mechanical properties as described above. At this time, the calcination conditions are not limited, but it is preferable to grind the dolomite ore to 20 to 50 mm, then calcinate it at 600 to 1000° C. for 24 to 48 hours to have a powder of 3,000 to 6,000 cm / g. The light small dolomite thus prepared contains activated magnesia, and the activated magnesia participates in the hydration reaction, and when the hydration day elapses for 3 days, 100% participates in the hydration reaction, resulting in crack reduction effect and high strength expression. In addition, it is preferable that the light small dolomite has a specific surface area of 50 to 60 m 2 /g because it is advantageous to participate in the hydration reaction.

In the production of calcined dolomite according to the present invention, when the calcination temperature is out of the range, magnesia having dead burnt crystals is generated, and in this case, the proportion of magnesia participating in the hydration reaction is only about 9 to 23% even after 3 days of hydration. It is better to maintain the above temperature range because the crack reduction effect and strength decrease as well as excessive expansion at later age.

The dolomite is preferably contained in an amount of 20 to 50% by weight of the total cement composition. When added below the above range, the above-mentioned content of magnesia decreases, so the effect of increasing mechanical properties due to expansion is insignificant. When added above the above range, cracks occur in the panel due to excessive expansion at a late age.

In the present invention, the cement composition may further include various additives along with water in addition to the above composition.

The water is not limited to the type, but it is preferable to use clean purified water without impurities. In addition, although the amount of water to be added is not limited, it is preferable to add it in a proportion of 10 to 20% by weight on condition that drying shrinkage of the panel, material separation, etc. do not occur.

The additive is not limited to the type and amount added within the scope that does not impair the purpose of the present invention, and examples of the additive include a viscosity modifier, a flame retardant, a waterproofing agent, a silica fume, geothermal silica, a thickener, a pigment, a colorant, a plasticizer, a dispersant, There are molding agents, coagulants, drainage aids, and strength aids. One or two or more of these additives may be added according to manufacturing conditions.

In addition, the composition may further add one or more gypsum to adjust the setting rate of the composition and increase durability, if necessary.

The gypsum (calcium sulfate) is a generic term for minerals having the chemical composition of calcium sulfate in a broad sense, and has excellent incombustibility and rapid hydration-setting properties. In addition, it is widely used as a filler in cement compositions because of its low price because it is produced in large quantities as a by-product in the desulfurization process or in the production of phosphoric acid and hydrofluoric acid.

In the present invention, the gypsum is not limited to chemical gypsum, natural gypsum, desulfurized gypsum, etc. commonly used in the art, but preferably a mixture of anhydrite and dihydrate gypsum is used.

The anhydrite (CaSO ₄ ) is also called anhydrite, and refers to gypsum that does not contain water. Such anhydrite can improve compressive strength while maintaining setting time when mixed with Portland cement.

Dihydrate gypsum (CaSO ₄ ·2H ₂ O) is also called crystal gypsum, and is characterized by having two water molecules. The dihydrate gypsum may further increase the mechanical strength of the panel by accelerating the setting time of the composition, particularly cement. However, the dihydrate gypsum has poor compatibility with cement when added alone, but when mixed with anhydrite is added, compatibility with cement is improved and the above-described effects can be expressed.

In the gypsum, the composition ratio of anhydrite and dihydrate gypsum is preferably 1: 0.1 to 0.5 weight ratio, respectively, to increase the mechanical properties of the composition. In addition, although the amount of addition is not limited, it is preferable to add 1 to 10% by weight of the total composition because the effect of improving the mechanical properties of the panel can be expressed.

The present invention may include a building panel and a flooring material made of the cement composition including the oyster shell as described above. In this case, the building panel may be used as an interior/exterior material of a building, such as a flooring material or a wall material, and may also be used for manufacturing a sandwich panel manufactured by combining with other core materials other than the interior/exterior material.

In addition, the flooring material refers to a panel for paving the floor inside the building, but in the present invention, as described above, not only for pavement inside the building, but also for road boundary stones, road pavement materials, sidewalk blocks, parking lot floor blocks, grass blocks, etc. walkways It may include any type of exterior material used for walk-way or landscaping purposes.

Here, the cement composition may be prepared as a reinforcing earth block. The reinforcing earth block constitutes a retaining wall, which is a wall installed to prevent soil from collapsing. Retaining walls of a desired size and shape can be built by building a retaining wall by stacking a number of reinforcing earth blocks manufactured with standardized dimensions. have.

The building panel is not limited to a manufacturing method. For example, after sufficiently stirring and mixing the above-described compositions, the composition is filled in a mold. And it is preferable to cure it for 12 to 60 hours at a temperature of 40 to 80 ℃.

In particular, when the cement composition is cured, heat is generated during the hydration reaction of water with the cement. If the heat is excessive, the hydration reaction may be slowed, so it is better to lower the temperature of the curing room to control this.

The composition cured as described above is demolded, cut to a desired size, and the surface is polished. In addition, the compression rate may be further increased by applying a high-pressure press as needed during the curing process.

The building panel according to the present invention can produce a beautiful appearance by including oyster shells that can exhibit various colors when manufacturing a composition containing cement, and at the same time improve mechanical properties such as compressive strength and chemical properties such as antibacterial effect. can

In addition, the building panel, etc., can secure sufficient strength, so it can be manufactured thinly, and at the same time, irregular and various patterns can be expressed, so that beautiful building exteriors and interiors can be expressed. have.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following examples are only examples for explaining preferred embodiments of the present invention, and the present invention is not limited by the following examples.

The method of measuring the physical properties of the specimens prepared in Examples and Comparative Examples and the specifications of the materials used are as follows.

(Specification)

The specifications of the material are shown in Table 1 below. However, the oyster shells used in Example 8 below were modified oyster shells, specifically, 1,000 parts by weight of dimethylformamide and 100 parts by weight of polyglycolide (weight average molecular weight 800) were mixed with 100 parts by weight of oyster shells and left for 3 days. .

[Table 1]

(compressive strength)

The test was carried out in accordance with KS F 2405 (compressive strength test method of concrete), and the average value was calculated by repeating measurements three times.

(Bending strength)

The test was conducted in accordance with KS F 2273 (performance test method for assembly plate), and the average value was calculated by repeating measurement three times.

(Examples 1 to 8 and Comparative Example 1)

After sufficiently mixing the compositions in the composition ratio shown in Table 2 below, it was placed in an iron mold having a size of 650 mm × 1,250 mm × 1,100 mm and vibration was applied with a vibrator to remove air bubbles and voids. And the mold was demolded after curing for 48 hours in a curing room at 60°C. After the demolding composition was cut to a size of 100 mm × 300 mm × 30 mm, the physical properties of the specimen were measured.

[Table 2]

As shown in Table 2, it can be seen that the panel specimen manufactured according to the present invention exhibits excellent compressive strength and flexural strength. Specifically, it was confirmed that Example 1 in which oyster shells were added had higher mechanical properties compared to Comparative Example 1 in which oyster shells were not added. However, in Examples 2 and 3 in which the amount of oyster shell added deviates from the standard value, both the compressive strength and flexural strength decreased compared to Example 1, indicating that the amount of oyster shell addition should be adjusted within a certain range.

In addition, Example 4 in which anhydrite was added to the composition slightly increased compressive strength and flexural strength, and Example 6 in which both anhydrite and dihydrate gypsum were added showed a very large increase in compressive strength and flexural strength. However, in Example 5, in which only dihydrate gypsum was added, or in Example 7, in which the amount of dihydrate gypsum was higher than that of anhydrite, the increase in compressive strength and flexural strength was small, so the miscibility of dihydrate gypsum and cement was not good, and the physical properties of dihydrate gypsum It can be seen that in order to express a synergistic effect, it must be added by mixing with anhydrite.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the claims below, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (8)

10 to 40% by weight of oyster shell, 20 to 50% by weight of cement, 0.1 to 5% by weight of fiber reinforcing agent, 0.1 to 5% by weight of reinforcing agent, 1 to 10% by weight of gypsum and 20 to 50% by weight of dolomite,
The oyster shell is immersed in an aqueous solution in which one or a plurality of basic substances selected from sodium hydroxide, calcium hydroxide, aluminum hydroxide, potassium hydroxide, magnesium hydroxide, sodium hydrogen carbonate and ammonia are dissolved to remove organic matter on the surface, and then poly-lactide- Co-glycolide, polyglycolide, polylactide and polycaprolactone hydrophobically modifying the surface with any one or a plurality of biodegradable polymers,
The gypsum is a cement composition comprising an oyster shell, characterized in that it is a mixture of anhydrite and dihydrate gypsum in a weight ratio of 1:0.1 to 0.5, respectively.
delete The method of claim 1,
The fiber reinforcing agent is glass fiber, basalt fiber, carbon fiber, cellulose fiber, polyethylene fiber, polyamide fiber, polyester fiber, and a cement composition comprising an oyster shell, characterized in that a plurality of selected from the group consisting of metal fibers.
The method of claim 1,
The reinforcing agent includes any one or a plurality of air entraining agents selected from lignylsulfonic acid-based, oxycarboxylic acid salt, alkylarylsulfonic acid salt-based, melaminesulfonic acid salt-based, polycarboxylic acid-based, polycarboxylic acid-based and polyol derivatives. A cement composition comprising oyster shells, characterized in that
The method of claim 1,
The dolomite is 40 to 70% by weight of calcium oxide; 20 to 40% by weight of activated magnesia; and 10 to 20 wt% of any one selected from silicon dioxide, dialuminum trioxide, ferric trioxide, and sulfur trioxide, or a mixture thereof. A cement composition comprising oyster shells.
The method of claim 1,
The cement composition further comprises any one or a plurality of additives selected from viscosity modifiers, flame retardants, waterproofing agents, silica fume, geothermal silica, thickeners, pigments, colorants, plasticizers, dispersants, molding agents, coagulants, drainage aids, and strength aids A cement composition comprising oyster shells, characterized in that
A building panel comprising oyster shells prepared by curing and demolding the cement composition comprising oyster shells according to any one of claims 1 to 6 selected from the group consisting of oyster shells.
A flooring material comprising oyster shells prepared by curing and demolding the cement composition comprising oyster shells according to any one of claims 1, 3 to 6.