KR20030088739A - Manufacturing method and products of high glossy artificial stone based on concrete without grinding process - Google Patents

Abstract

PURPOSE: Provided is a concrete product, which has gloss and surface texture as good as a polished stone product without any polishing treatment and thus is environmentally and economically favorable. CONSTITUTION: The concrete product is produced by the method comprising the steps of: mixing cement, fine aggregate and additives homogeneously; adding water to the mixture and mixing together; adding coarse aggregate and mixing together; introducing the mixture into a mold and removing air bubbles through the vibration and tamping; carrying out the precuring and steam curing; and demolding the product from the mold and then treating with a water repellent.

Description

Manufacturing method and products of high glossy artificial stone based on concrete without grinding process}

Natural stone such as granite and marble, which are widely used in construction structures, is an excellent construction material with excellent fire resistance, durability, abrasion resistance, high compressive strength, and beautiful appearance, but as it becomes more difficult to obtain high quality natural stone The price of natural stone is rising day by day, while the demand of stone is increasing day by day as the demand for finishing materials increases. Against this background, many researchers are trying to develop artificial stone.

Artificial stone includes organic artificial stone made by mixing synthetic resin with calcite, color aggregate, etc. and organic inorganic mixed artificial stone whose main raw material is back cement, aggregate, synthetic resin, etc.In recent years, inorganic material such as back cement which improves the problem of organic artificial stone which is vulnerable to fire. Inorganic artificial stones using binders and aggregates have been developed.

However, since artificial stone and natural stone have to go through various stages of polishing process to produce gloss, the cost of polishing and the treatment cost of treating such sludge are generated, which leads to an increase in the cost of the product. have.

Existing inorganic or organic artificial stone has a complicated sludge generation and manufacturing process by several steps of polishing process for gloss expression, and has a disadvantage that the surface is monotonous because it is difficult to express the appearance.

The present invention was developed to solve the above disadvantages of the existing artificial stone to express the gloss of the surface of the artificial stone more than 50 (∠65 ℃) without the grinding process, can be obtained more than 1000kgf / ㎠ 3 days compressive strength In addition, it is a method of manufacturing a product that can exhibit a variety of patterns according to the pattern of the form because it is poured by curing the mixture with high fluidity.

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The manufacturing method of the present invention for manufacturing the artificial stone as described above is divided into six steps as shown in FIG. Step 1 attaching transfer material such as natural resin or synthetic resin film to mold to make the surface of artificial stone polished, sand, coarse aggregate, cement (back cement, roughened steel cement, ordinary cement, etc.), admixture material (silica groove, Blast furnace slag, fly ash, silica powder, gypsum, lime, polymer, high performance reducing agent, antifoaming agent, shrinkage reducing agent), etc. 2 steps to uniformly mix and mix, 3 to remove bubbles by frequency vibration and to make compact molding Step, curing four steps to express sufficient strength and gloss, five steps to protect to maintain the expressed gloss, and six steps to check the strength, glossiness, dimensions, etc. of the product.

[Stage 1 ]

Concrete is a material that can exhibit a variety of patterns depending on the shape of the mold because it is a flowable fluid before hardening. In addition, since the surface of the concrete has the property of transferring the texture and gloss of the surface material of the mold, when the transfer material having a high gloss and smooth material such as a natural resin film or a synthetic resin film is used, the gloss can be expressed better. have.

[Step 2]

In order to express a high strength of 1,000kgf / ㎠ or more, unlike the general concrete compounding, the amount of unit binder is high, it is advantageous to use less than 13mm aggregate. In addition, since the water cement ratio is also 25% or less, the use of a high performance water reducing agent is essential. Mixed materials such as blast furnace slag, fly ash, silica powder, and silica fume, which react with pozzolanic reaction, react with Ca (OH) ₂ , a cement hydration product, to make concrete structure more dense, which is advantageous for the appearance of gloss. It can also bring about effects such as enhancement and water absorption. In addition, various colors can be expressed by appropriate use of the inorganic pigment.

[Step 3]

Existing artificial stone products are formed by carrying out unbalanced vibration compaction and press molding, but the concrete used in the present invention has higher fluidity than these formulations, so it is possible to achieve sufficient compaction using a lower vibration method. However, it is preferable to use the ultrasonic vibration method in order to sufficiently remove the bubbles latent inside.

[Step 4]

In general, the curing method used for concrete products is steam curing, and the total curing period is defined as 650 cities in the KS standard. In the present invention, however, as shown in FIG. 2, after 2 hours of pretreatment, the temperature is raised to 65 to 85 ° C. at a rate of 5 to 10 ° C. per hour, and when the maximum temperature is reached, it is allowed to stand for about one hour and then gradually cooled naturally.

Sudden temperature rise during curing leads to cracking of concrete that is not sufficiently hardened. Therefore, in the present invention, the temperature is gradually raised over the pretreatment period so that the concrete is condensed to prevent the occurrence of cracks due to rapid moisture evaporation.

[Step 5]

After curing, it is demolded on the 1st day of age and treated with gloss protection to maintain gloss. In order to protect the gloss, a permeable water repellent such as silicone or fluorine is applied to prevent gloss loss due to moisture penetration. In addition, the surface is coated with wax or the like to maintain the gloss for a long time.

[Step 6]

The product shall be inspected according to KS and various related standards regarding the strength, glossiness, water absorption and dimensions of the product before shipment.

Example 1 Examination of compressive strength and glossiness according to cement type

As a result of examining the compressive strength and glossiness of each cement type at the same water cement ratio, the compressive strength of the cemented steel with the larger powder than ordinary cement or back cement showed higher compressive strength, and the daily compressive strength after steam curing was 1000kgf / More than cm 2 was shown. In terms of glossiness, the brightest cement was shown to have the highest glossiness.

Example 2 Examining the Compressive Strength and Glossiness According to Unit Bonding Capacity

The higher the unit binder mass, the higher the compressive strength. When the unit binder mass is more than 1000kg / ㎥, the compressive strength is more than 1000kgf / ㎠. The glossiness was also higher as the binder content increased.

Example 3 Examining the Compressive Strength and Glossiness According to Kinds of Admixtures

In general, when the pozzolanic reaction material is used as a mixed material, strength tends to decrease at an early age and increase at long-term strength. However, as a result of curing by the steam curing method presented in this study, all of them except for fly ash showed strength similar to or greater than that of the comparative example without using a mixed material on Day 1. In terms of strength, the substitution of silica fume showed the highest value of 1200kgf / cm2 or more per day. In terms of glossiness, white blast furnace slag and fine silica powder showed higher glossiness.

Example 4 Examination of Glossiness According to Form Type

As a result of examining the glossiness according to the form type, the gloss of resin film paper was more than twice higher than that of general plywood, stucco plywood and iron plate. In order to increase the glossiness of the invention, it was found that the smoother the surface, the better the use of gloss. This is because the smoother the form material is, the smoother the surface of the product is, thereby increasing the specular reflectance that most affects the gloss. Figure 3 shows the surface of the product taken from a sample of the product and magnified by a stereo microscope. You can see that the shiny surface is a smoother surface.

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Claims (2)

Mix cement, fine aggregate and admixture until uniform, add water to it and mix, add coarse aggregate to it, mix the above mixture into mold and remove bubbles through vibration and compaction After that, steam curing is carried out, and the mixture is manufactured by demolding and water repelling from the formwork, so that it is possible to realize gloss, beautiful patterns and various colors without the polishing process, which is an essential process for existing artificial stone. The recipe for this affordable high strength polished concrete product High strength concrete product manufactured by the method of claim 1