KR101108473B1 - Manufacturing methods of wet gypsum based concrete floor underlayments self-levels to produce a smooth surface - Google Patents

Abstract

The present invention provides a first step of preparing a gypsum-based cement composition, including calcium sulfate alpha-hemihydrate and hydraulic cement, and crushing and grinding waste glass and waste ceramics. A second step of forming aggregates by uniformly mixing recycled ceramic sand and silica sand of spherical polyhedral granules in predetermined unit sizes, and mixing gypsum cement composition and aggregates in a mass ratio of 1: 0.5 to 1: 3. And mixing the mixture with water and kneading the same to prepare a wet gypsum-based concrete flooring material, thereby having a fluidity enough to form a flat surface by pouring only the wet gypsum-based concrete flooring material, and hardening quickly. Compared to light weight, the compressive strength after curing is very high.

Recycled ceramic sand, silica sand, gypsum cement, concrete, flooring

Description

MANUFACTURING METHODS OF WET GYPSUM BASED CONCRETE FLOOR UNDERLAYMENTS SELF-LEVELS TO PRODUCE A SMOOTH SURFACE}

The present invention relates to a method of manufacturing a wet gypsum-based concrete flooring, and in particular, the surface is flattened and quickly cured by pouring only as a subfloor of a high-rise building such as an apartment. It relates to a concrete flooring manufacturing method.

Typically, gypsum-based building flooring or baseboards are installed in new or existing flooring structures such as wooden boards, plywood, and building concrete. It is installed by pouring, pumping or spreading liquid wet concrete mixtures into existing flooring.

These methods have some advantages. First, when the wet gypsum-based composition is applied on wood such as plywood flooring, it is possible to form a surface free of splinters, squeaks and nails by some degree of self-leveling of the wet mixture. Accordingly, after the mixture is cured, a lining material such as linoleum, wood parquet, vinyl or paper sheet, carpet, and the like can be easily laid on the flooring material. Second, because the wet mixture is a fluid, it fills the cracks at the interface between the flooring and the surrounding seams, so that the flooring hardens significantly reduces the leakage between the room and the floor. Third, since the composition is composed mostly of gypsum, it can inhibit the spread of flame and smoke to the surroundings in case of fire. Fourth, pourable concrete flooring can be used to repair cracked, worn, or low-traffic concrete flooring. In other words, when the composition is applied to the existing floor, the gap between the flow composition is filled and the depressions or protrusions of the flooring material can be flattened.

To date, many methods have been proposed for producing high strength hardened flooring materials having a high compressive strength of at least 2,000 psi (psi, one pound pressure applied to one square inch) and building floorings having these requirements. For example, US Pat. No. 4,075,374, US Pat. No. 4,159,912, US Pat. No. 4,444,925 have proposed building flooring methods, respectively, but there is a problem in that the flooring having the required strength cannot be manufactured.

In particular, in the case of US Pat. No. 4,159,912, there was a problem in that dust was generated on the surface of the flooring material after curing, and surface treatment such as washing and sealing was required to properly apply the concrete flooring material. In addition, the flooring prepared according to US Pat. No. 4,075,374 tends to peel off from the flooring in which the wet composition is introduced.

It is an object of the present invention that the surface is flat even without pouring or a separate finishing process, there is almost no foreign matter such as surface dust, and the curing speed is very fast to have a self-smoothness to shorten the entire concrete flooring production process The present invention provides a method for manufacturing a wet gypsum-based concrete floor.

Another object of the present invention is to provide a wet gypsum-based concrete flooring manufacturing method having a high compressive strength as compared with light weight, and having its own smoothness to have crack resistance and peeling resistance with the lower floor.

Method for producing a wet gypsum-based concrete flooring having a self-smoothness according to an embodiment of the present invention for achieving the above object is a gypsum including calcium sulfate alpha- hemihydrate and hydraulic cement (hydraulic cement) A first step of preparing a cement composition and a second step of evenly mixing 19-90 mesh silica sand by a predetermined unit mesh in a 19-90 mesh to form an aggregate, and the gypsum And a third step of mixing the cement composition and the aggregate in a mass ratio of 1: 0.5 to 1: 3 and mixing water by mixing the mixture with water to prepare a wet gypsum-based concrete floor.

In addition, the wet gypsum-based concrete flooring manufacturing method according to another embodiment of the present invention includes calcium sulfate alpha-hemihydrate and hydraulic cement, gypsum-based cement composition. And a second step of forming aggregates by uniformly mixing recycled ceramic sand and silica sand of spherical polyhedral granules by predetermined unit sizes by crushing and grinding waste glass and waste ceramics. And a third step of mixing the gypsum-based cement composition and agglomerates in a mass ratio of 1: 0.5 to 1: 3 and mixing water by kneading these mixtures to prepare a wet gypsum-based concrete flooring.

According to the present invention, when the pump is pumped on the base floor, the surface itself can be leveled without the need for a large-scale floating or finishing process so as to form a lightweight, high-strength gypsum-based concrete floor by simply pouring the wet gypsum-based concrete flooring material. It is fluid enough to achieve relatively high cure rates, dimensional stability that imparts cracking resistance and peeling resistance of the hardened flooring, and can achieve a compressive strength of 2,000 to 4,000 psi of hardened flooring.

Hereinafter, preferred embodiments of the present invention will be described in more detail.

The wet gypsum-based concrete flooring material having the self-smoothness of the present invention is formed by mixing and mixing gypsum-based cement composition and aggregate composed of silica sand or agglomerate composed of recycled ceramic sand and silica sand with water, thereby providing fluidity ( Its excellent flowability and self-smoothness make the gypsum-based concrete floor flat by pouring just to cure and quickly harden to complete the lightweight high-strength gypsum-based concrete floor.

The most important component in the present invention is agglomerates composed of silica sand or recycled ceramic sand and silica sand. In general, in order to smooth the automatic level during the construction of the floor, the concentration is diluted. When the general sand is used as the aggregate, the sand absorbs water and sinks, which makes it difficult to automatically level.

The aggregates made of silica sand or recycled ceramic sand and silica sand of the present invention do not absorb moisture unlike ordinary sand and do not sink even when the concentration is diminished. Since the specific gravity is similar to that of cement and gypsum, the flooring is evenly distributed. Automatic horizontal work is easy.

In addition, the strength is higher than the general sand, there is no twisting or cracking phenomenon during construction, it is excellent in heat transfer and heat retention, which helps in energy saving, unlike the general sand, there is no fear of environmental hormones such as silica emitted.

Hereinafter, the wet gypsum-based concrete flooring material having its own smoothness will be described through a three-step manufacturing process.

The first step in manufacturing the wet gypsum-based concrete flooring of the present invention is to first prepare a gypsum-based cement composition.

The main component of the cement-based cement composition is calcium sulfate alpha-hemihydrate, and includes hydraulic cement, a superplasticizer, a defoamer, an alkylcellulose, and the like. do.

Calcium sulfate alpha-hemihydrate, which is the first component of the gypsum-based cement composition, is a type of gypsum, and among them, belongs to an alpha (α) type calcined gypssum.

An example of calcium sulfate alpha-hemihydrate is that manufactured by EK Industries, to which the applicant of the present invention belongs, which has a typical purity of 97.5%, a standard consistency of 40 to 41, and Vicat. The curing time is 20-30 minutes, and the compressive strength for one hour immediately after curing is very high, about 2,000-4,500 psi.

The calcium sulfate alpha-hemihydrate is prepared so as to contain 70% by mass or more of the whole gypsum cement composition, and is preferably formulated to maintain a content range of 79 to 94% by mass.

Hydraulic cement, the second component of the gypsum-based cement composition, is cement hardened by chemical interaction with water. Typical types of cement include portland cement, alumina cement, fly ash, Silica fume and the like.

Among them, portland cement is used in the present invention, and V-type portland cement is used among I- and V-type portland cements. V-type Portland cement is excellent in sulfuric acid resistance, and when wet, hardly occurs in dimensional change due to shrinkage and expansion occurring during curing, thereby making it possible to manufacture high-strength concrete flooring. On the other hand, if the use of the hydraulic cement that is weak in dimensional changes, the concrete flooring material of the present invention may be peeled from the base of the base due to the generation of the dimensional change.

In the gypsum cement composition of the present invention, the content of hydraulic cement is preferably 5 to 20% by mass of the total composition, more preferably 10 to 15% by mass. If the hydraulic cement is used in more than 20% of the total gypsum-based cement, the weight is high and may cause cracks during drying.

Next, the remaining trace components of the gypsum cement composition in addition to the calcium sulfate alpha-hemihydrate and hydraulic cement will be described.

The high fluidizing agent is one of the compounds added to the cement according to the mixing ratio of water and cement to give higher wettability or slump to the wet mixture. As the high-purifying agent of the present invention, naphthalene sulfonates, naphthalene sulfonate-formaldehyde condensates, calcium lignosulfonate, melamine sulfonate-formaldehyde concentrate (melamine sulfonates) sulfonate-formaldehyde condensates) and polycarboxylic acids. At this time, it is preferable to make content of a high fluidizing agent into 0.5-0.75 mass% of all gypsum cement.

On the other hand, in addition to the high fluidizing agent (water reducing agents, plasticizers, cement dispersing agents) compounds such as cement dispersing agent (cement dispersing agents), if any of those compounds that can exhibit the desired fluidity (fluidity) effect of the cement composition is used You may.

As other trace components of gypsum-based cement compositions, antifoaming agents include tributyl phosphate, silicones, borate esters, petroleum derivatives and tert-butyl phthalates. Select one and use it.

The content of the antifoaming agent is to be 0.2% by mass or more of the gypsum-based cement composition. In the present invention, the content of the antifoaming agent is preferably within the range of 0.2% by mass to 0.5% by mass. This is sufficient to prevent the formation of bubbles so that after the application of the wet gypsum-based concrete flooring air bubbles are formed and rise to the flooring surface, unsightly cavities, well known as bugholes in this field, are not formed. It is enough.

And the gypsum-based cement composition of the present invention contains a trace amount of alkyl cellulose. Alkylcellulose is added in the minimum amount in the range effective to increase the uniformity of the recycled ceramic sand of the wet composition and to reduce the water released on the surface of the wet gypsum-based concrete flooring of the present invention during curing. At this time, if the content of the alkyl cellulose is too high, the desired strength and fluidity of the wet composition will not be realized.

As the alkyl cellulose, one selected from hydroxyalkyl celluloses and 2-hydroxypropyl cellulose is used. The content of the alkyl cellulose is generally to be 0.002% by mass or more of the gypsum-based cement composition, in the present invention, it is preferable to be contained within the range of 0.002 to 0.01% by mass.

In conclusion, in the first step, 79 to 94% by weight calcium sulfate alpha-hemihydrate, 5 to 20% by weight hydraulic cement, 0.5 to 0.75% by mass high fluidizing agent, and 0.2 to 0.5% by mass defoamer Gypsum-based cement composition of the present invention is prepared by mixing an alkyl cellulose of 0.002-0.01 mass%.

In preparing the gypsum-based cement composition mixture, each of the components is added sequentially and stirred for about 2 minutes with a paddle type or ribbon type stirrer so that they are well mixed. When the agitation is complete, pack in packs, but generally at 36.36 kg (or 80 lb.) per pack.

Next, in the second step of the present invention, aggregates are formed by using recycled ceramic sand and silica sand obtained by crushing and crushing waste glass products and waste ceramic products.

In the embodiments of the present invention, the aggregate may be formed by only silica sand or by mixing silica sand and recycled ceramic sand. Agglomerates formed using recycled ceramic sand and silica sand according to embodiments of the present invention have an effect of smoothly performing the automatic horizontal operation during floor construction.

First, in the embodiment of the present invention, aggregates are formed by using silica sand formed of quartz grain sand containing SiO ₂ components.

Silica sand is used as a raw material of glass or porcelain products, which is a main material for making recycled ceramic sand according to another embodiment of the present invention, and therefore, its efficacy is similar to that of recycled ceramic sand according to another embodiment of the present invention. In other words, the silica sand does not absorb moisture, unlike ordinary sand does not sink even if the concentration is diminished, and the specific gravity is similar to cement and gypsum, evenly distributed evenly, it is very easy to automatically level the flooring.

In addition, it has higher strength than general sand, no torsion or cracking during construction, and is excellent in heat transfer and heat retention, which helps to save energy, and it is light, but has high compressive strength after curing, and hardens quickly by dissipating heat. It has the advantage of being.

As a result of many experiments, the Applicant was able to confirm that pumping is smooth when working with 19 to 90 mesh silica, preferably 30 to 60 mesh silica, and exhibit the maximum effect as silica sand. . In addition, the applicant has found that by using evenly mixed silica sand having a predetermined size by a predetermined unit size, it is possible to prevent breakage and breakage of the coating film due to an external impact and to compensate and prevent cracking of the structure.

In addition, when using evenly mixed 30 to 60 mesh (silica) sand, it was found that not only the mixing of the flooring material was well mixed, but there was no sinking phenomenon during mixing, and the heat transfer after the work showed the most excellent effect. In the present invention, evenly mixing 30 to 60 mesh of silica sand, for example, 30 mesh, 40 mesh, 50 mesh, 60 mesh silica sand evenly mixed within the 30 to 60 mesh range is most preferably used.

In another embodiment of the present invention, the waste glass product in the silica sand formed by mixing evenly 19 to 90 mesh (grain), preferably 30 to 60 mesh (grain) of the predetermined unit mesh as described above, Aggregates are formed by mixing recycled ceramic sand obtained by crushing and grinding waste ceramic products.

In another embodiment of the present invention is to be understood that the 'recycled ceramic sand' is a powder grain of spherical polyhedron obtained through a process of crushing and pulverizing various waste glass products, such as glass bottles or glass bowls, and various waste ceramic products. In addition, the term “spherical polyhedron” refers to polyhedrons, such as pentagons, hexagons, and hexahedrons, which are not plate-like, but are close to spherical.

Ordinary glass pieces and ceramics pieces are sharp or flat when crushed and become spherical powder particles when crushed several times, resulting in poor adhesiveness and reduced strength, and clogging in hoses and equipment when pumping.

The recycled ceramic sand of the present invention is primarily crushed waste glass products, waste ceramic products by, for example, a hammer mill or tromell mill, and then secondarily crushed by a vertical axis impactor (VSI). It is obtained by classifying by size by screening, and it is grain of spherical polyhedron such as pentagon, hexagon and heptagon. Due to this shape, recycled ceramic sand is well adhered when mixed with wet gypsum cement, prevents clogging in the hose when pumping the product, and has a high strength unlike ordinary glass pieces and ceramic pieces.

In addition, the applicant was able to know through the experiment that the use of recycled ceramic sand concrete according to the size of the recycled ceramic sand when mixing with cement using recycled ceramic sand. That is, it was found that if the size of the ceramic granules is too small or too large, the ceramic granules cannot be used as ceramic sand of the flooring material. For example, it was found that the use of ceramic sand of 16 mesh or less not only prevents even mixing, but also makes it impossible to work during pumping.

As a result of many experiments, the applicant has found that 19-90 mesh recycled ceramic sand, preferably 30-60 mesh recycled ceramic sand, is smoothly pumped and can exhibit the maximum effect as ceramic sand. I could confirm that.

In addition, when evenly mixed recycled ceramic sand of 30 to 60 mesh (mesh) is used, not only the mixing of the flooring material is well mixed, but also no sinking phenomenon during mixing, and the heat transfer after the work has the most excellent effect. there was. In the present invention, evenly mixing 30 to 60 mesh recycled ceramic sand, for example, it is most preferable to use a mixture of 30 mesh, 40 mesh, 50 mesh, 60 mesh recycled ceramic sand evenly within the range of 30 to 60 mesh. Do.

Recycled ceramic sand and silica sand composed of grains of 19 to 90 mesh (mesh), preferably recycled ceramic sand and silica sand of grains of 30 to 60 mesh (mesh) of 1: 9 to 9: 1 It can be blended freely within the mass ratio to form an aggregate.

In the case of using the aggregate composed of the recycled ceramic sand and silica sand as described above, the compressive strength is high after curing as compared with light weight, and heat is quickly released by curing. In particular, it hardens in a fast time by forming its own crystal when cured, and has the advantage of quickly discharging moisture.

Finally, in the third step of the present invention, the gypsum-based cement composition mainly composed of calcium sulfate alpha-hemihydrate is mixed with fine aggregates and kneaded in water to complete the manufacture of the wet gypsum-based concrete flooring.

In this step, a method of manufacturing a wet gypsum-based concrete flooring material and pouring the basic gypsum-based concrete flooring material together will be described together.

In this step, water is added to the gypsum-based cement composition and the fine aggregate (aggregate) mixed in a predetermined ratio and stirred for 1 ~ 2 minutes to prepare a uniform slurry.

The gypsum-based cement composition and the aggregate are mixed in a mass ratio of 1: 0.5 to 1: 3, preferably in a mass ratio of 1: 1 to 1: 3, and most preferably in a mass ratio of 1: 1.5 to 1: 2.25. It is good to mix and manufacture. In addition, the gypsum-based concrete flooring mixture and water are mixed at a mass ratio of 1: 0.2 to 1: 0.75, and preferably mixed at a mass ratio of 1: 0.4 to 1: 0.55 and kneaded. Aggregate can control the strength of the flooring according to the amount used, and the strength of the cement itself can be adjusted in various forms by using a small amount of ceramic dust in the aggregate.

The amount of water of the present invention is floated or finished when 600 ml of the wet gypsum-based concrete flooring material of the present invention is poured into a single tray having a size of 15.2 cm × 20.3 cm × 1.9 cm at a height of 12.7 cm. Even without the process, the dough itself is completely flat and fluid enough to form a topographically smooth surface, it cures quickly, there is no dust on the surface after curing and the compressive strength can be 2,000 to 4,500 psi. That's enough.

Since the fluidity of the wet gypsum-based concrete flooring of the present invention is different from that of general cement or the slump, the gypsum-based cement composition having the same or the same slump as the present invention is not the same.

When mixing the gypsum-based cement composition with the aggregate and the water, the necessary fluidity is realized by controlling the amount of water. The addition of a larger amount of water further improves the fluidity of the concrete but lowers the strength of the hardened concrete.

In addition, calcium sulphate alpha-hemihydrate has the property of hard gypsum-based concrete flooring to harden very rapidly. Therefore, in most cases, a hardening inhibitor is added to the dry cement composition so that the wet gypsum-based concrete flooring material of the present invention is hardened at a more convenient time.

As for said convenient time, 20-120 minutes are preferable and 30-90 minutes are the most preferable. The time is obtained by taking a sample of dry gypsum-based cement composition, mixing it with agglomerates and water such as ceramic sand at a suitable ratio, and determining the amount of curing inhibitor required to obtain a desired result by measuring the curing time.

This technique is obvious to those skilled in the art and need not be described in detail, but the use of sodium citrate should be avoided because it is disadvantageous in terms of fluidity of the wet composition. In the present invention, a protein inhibitor is used as a curing inhibitor, and any other curing inhibitor may be used as long as it does not harm the beneficial properties of the composition according to the present invention.

Any kind of stirrer used to combine the components constituting the wet gypsum-based concrete of the present invention may be used. However, Strong Manufacturing Company. It is advantageous to use stirrers such as PLACER II®, GROUTMATE® and GROUT-A-MATIC® manufactured by Strong Manufacturing Company, Inc. (Pine Bluff, Ark.). Such a device simplifies the production process of building floorings, as it allows for the preparation of wet compositions, pumping, and placement on building floors.

In the manufacture of the wet gypsum-based concrete flooring, the composition is pumped onto the building base flooring to form a building flooring. Typical methods are to place a hose on a building base floor, pump a wet mixture, and move the hose end from one place to another to more easily cover the flooring with gypsum-based cement composition. The composition is excellent in its smoothness and does not require a separate treatment.

The surface of the building base floor, such as plywood, oriented strand board, wafer board or concrete, is primed to enhance bonding with the flooring composition, or the wet gypsum of the invention prior to curing. It should be noted that sealers may be treated to prevent excessive penetration of water from the concrete floor to the building base.

Examples of such primers and sutures are rewettable latex copolymer emulsions prepared as LevelGREEN FLOOR PRIMER at EK Indusrties, and non-rewettable latex copolymers known as LevelGREEN FLOOR PRIMER. Emulsions and the like.

In the case of using the suture, it is preferable to apply a primer thereon after the suture is dried, which is generally required for excellent bonding between the gypsum-based concrete flooring material of the present invention and the lower base floor thereof.

Once wet gypsum-based concrete floors are pumped, they usually cure within 60 to 90 minutes. However, depending on the degree of coating, it is applied after 2 hours for light foot traffic, and after 24 hours for heavier traffic. And, when the flooring is cured enough to accommodate the heavier traffic, carpet, linoleum, tile, wood, or other floor coverings can be laminated onto the gypsum-based concrete flooring. have. Alternatively, the surface can be coated with a suture as described above.

Up to now, in the description of the present invention, a gypsum cement composition is prepared using calcium sulfate alpha-hemihydrate as a main component, and water is mixed and kneaded with the gypsum cement composition and the agglomerates composed of silica sand or silica sand and recycled ceramic sand. Although a method of manufacturing a wet gypsum-based concrete flooring material having its own smoothness and a flooring material have been described as specific examples, the present invention has the same functionalities as well as various gypsum and recycled ceramic powders and silica sand in addition to calcium sulfate alpha-hexahydrate. It can also be variously changed by the method of using the aggregate which has these.

Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

Claims (24)

A first step of preparing a gypsum cement composition comprising calcium sulfate alpha-hemihydrate and hydraulic cement, A second step of forming an aggregate by mixing 19-90 mesh of silica sand evenly by a predetermined unit mesh in 19-90 mesh; The gypsum-based cement composition and agglomerates are mixed at a mass ratio of 1: 0.5 to 1: 3, and water is mixed and kneaded with these mixtures, thereby preparing a wet gypsum-based concrete flooring. Method for manufacturing wet gypsum concrete floors. The method of claim 1, The aggregate is a method of producing a wet gypsum-based concrete flooring having a self-smoothness, characterized in that it is obtained by evenly mixing the silica sand of a predetermined unit mesh in 30 ~ 60 mesh (mesh). 3. The method of claim 2, The gypsum-based cement composition is composed of 79 to 94% by mass of calcium sulfate alpha-hemihydrate, 5 to 20% by mass of hydraulic cement, and 0.5 to 0.75% by mass of a superplasticizer. ), A method of producing a wet gypsum-based concrete flooring material having self-leveling, characterized in that it is obtained by mixing a defoamer of 0.2 to 0.5% by mass and an alkylcellulose of 0.002 to 0.01% by mass. The method according to any one of claims 1 to 3, The gypsum-based cement composition and agglomerates are mixed with water in a mass ratio of 1: 0.2 to 1: 0.75 to kneading to prepare a wet gypsum-based concrete flooring, characterized in that the wet gypsum-based concrete flooring manufacturing method. 5. The method of claim 4, The compressive strength of the wet gypsum-based concrete flooring is a wet gypsum-based concrete flooring manufacturing method having a self-smooth, characterized in that to be 2,000 to 4,500psi. A first step of preparing a gypsum cement composition comprising calcium sulfate alpha-hemihydrate and hydraulic cement, A second step of forming aggregates by crushing and crushing waste glass and waste pottery, and mixing the recycled ceramic sand and silica sand of spherical polyhedral granules evenly by a predetermined unit size; The gypsum-based cement composition and agglomerates are mixed at a mass ratio of 1: 0.5 to 1: 3, and water is mixed and kneaded with these mixtures, thereby preparing a wet gypsum-based concrete flooring. Method for manufacturing wet gypsum concrete floors. The method of claim 6, The gypsum-based cement composition is obtained by mixing calcium sulfate alpha-hemihydrate with hydraulic cement, a superplasticizer, a defoamer, and an alkylcellulose. Method for producing a wet gypsum-based concrete flooring having its own smoothness. The method of claim 7, wherein The recycled ceramic sand and silica sand is a method of producing a wet gypsum-based concrete flooring, characterized in that obtained by mixing in a mass ratio of 1: 9 to 9: 1: 1. The method of claim 8, The recycled ceramic sand and silica sand is a granule of 30 to 60 mesh, and the aggregate is obtained by uniformly mixing the recycled ceramic sand and silica sand of a predetermined unit mesh within 30 to 60 mesh. Method for producing wet gypsum-based concrete flooring having smoothness. The method according to any one of claims 7 to 9, The gypsum-based cement composition and agglomerates are mixed with water in a mass ratio of 1: 0.2 to 1: 0.75 to kneading to prepare a wet gypsum-based concrete flooring, characterized in that the wet gypsum-based concrete flooring manufacturing method. The method of claim 10, The compressive strength of the wet gypsum-based concrete flooring is a wet gypsum-based concrete flooring manufacturing method having a self-smooth, characterized in that to be 2,000 to 4,500psi. A first step of preparing a gypsum cement composition comprising calcium sulfate alpha-hemihydrate and hydraulic cement, 19 ~ 90 mesh recycled ceramic sand and 19 ~ 90 mesh silica sand in spherical polyhedral granules by crushing and crushing waste glass and waste ceramics A second step of forming an aggregate by mixing the mesh evenly; The gypsum-based cement composition and agglomerates are mixed at a mass ratio of 1: 0.5 to 1: 3, and water is mixed and kneaded with these mixtures, thereby preparing a wet gypsum-based concrete flooring. Method for manufacturing wet gypsum concrete floors. The method of claim 12, The recycled ceramic sand and silica sand is a method of producing a wet gypsum-based concrete flooring, characterized in that obtained by mixing in a mass ratio of 1: 9 to 9: 1: 1. The method of claim 13, The aggregate is a method of producing a wet gypsum-based concrete flooring having self-smoothness, characterized in that it is obtained by evenly mixing the recycled ceramic sand and silica sand of a predetermined unit mesh in 30 ~ 60 mesh (mesh). The method according to any one of claims 12 to 14, The gypsum-based cement composition is composed of 79 to 94% by mass of calcium sulfate alpha-hemihydrate, 5 to 20% by mass of hydraulic cement, and 0.5 to 0.75% by mass of a superplasticizer. ), A method of producing a wet gypsum-based concrete flooring material having self-leveling, characterized in that it is obtained by mixing a defoamer of 0.2 to 0.5% by mass and an alkylcellulose of 0.002 to 0.01% by mass. The method of claim 15, The gypsum-based cement composition and agglomerates are mixed with water in a mass ratio of 1: 0.2 to 1: 0.75 to kneading to prepare a wet gypsum-based concrete flooring, characterized in that the wet gypsum-based concrete flooring manufacturing method. The method of claim 16, The compressive strength of the wet gypsum-based concrete flooring is a wet gypsum-based concrete flooring manufacturing method having a self-smooth, characterized in that to be 2,000 to 4,500psi. 79 to 94 mass% calcium sulfate alpha-hemihydrate, 5 to 20 mass% hydraulic cement, 0.5 to 0.75 mass% superplasticizer, and 0.2 to 0.5 mass A first step of preparing a gypsum cement composition by mixing a defoamer of% and an alkylcellulose of 0.002% to 0.01% by mass, 30 ~ 60 mesh recycled ceramic sand and 30 ~ 60 mesh silica sand made of spherical polyhedral granules by crushing and crushing waste glass and waste pottery A second step of mixing to form an aggregate, The third step of mixing the gypsum-based cement composition and agglomerates in a mass ratio of 1: 1 to 1: 3 and mixing water in these mixtures in a mass ratio of 1: 0.4 to 1: 0.55 to knead to prepare a wet gypsum-based concrete flooring Method for producing a wet gypsum-based concrete flooring having its own smoothness, characterized in that it comprises a. The method of claim 18, The recycled ceramic sand and silica sand is a method of producing a wet gypsum-based concrete flooring having a self-leveling, characterized in that obtained by mixing in a mass ratio of 1: 9-9: 1. The method of claim 19, The compressive strength of the wet gypsum-based concrete flooring is a wet gypsum-based concrete flooring manufacturing method having a self-smooth, characterized in that to be 2,000 to 4,500psi. The method according to any one of claims 1 to 3, 6 to 9, 12 to 14, and 18 to 20, The hydraulic cement is Portland cement (Portland cement) characterized in that the wet gypsum-based concrete flooring manufacturing method having its own smoothness. delete delete delete