KR20000025773A - Method for producing porous cement block forming natural stone surface layer - Google Patents

Abstract

PURPOSE: A method for producing a porous cement block is provided to form a natural stone surface layer by protruding aggregates having natural stone touch such as silica, artificial stone and so on, on the porous cement block. CONSTITUTION: A method is completed by forming the surface layer of a cement block and forming the lower base of a cement block. Then, the method is progressed to the steps of protruding natural stone aggregates more than 80% and permeating cement paste between gaps at the same time, and of reinforcing the surface by spraying epoxy, urethane or unsaturated resin. Cement block is impermeable when the aggregate size of the lower base is 2.5mm and the aggregates pass through more than 10wt% and the block is permeable when the size is 2.5mm and passes through less than 10wt%. The permeable block of which gap rate is more than 12% is used for permeable road block, a sound proof block and a sound proof panel, and the impermeable block of which gap rate is 7 to 12% is used as an impermeable road block and a block for an interior.

Description

Manufacturing method of porous cement block with natural stone surface layer

The present invention relates to a method for producing a porous cement block having a natural stone surface layer such that the aggregate of natural stone texture such as natural stone bean gravel, jongseok, silica sand is protruded on the surface of the cement block.

Conventionally, cement blocks using natural stones have been manufactured. The method is to mix cement, water, etc. with natural stones to form blocks of ordinary concrete without voids, and then spray the surface layer with strong spray on the upper surface to form a surface layer. It was to cut off so that the natural stone protruded.

In the conventional method, when mixing natural stone and cement, the surface layer and the lower layer are processed without being separated and formed without forming any voids, and the natural stone protrudes in such a molding state, so that not only natural stone but also cement is formed on the surface thereof. The site was exposed as it was, so the protrusion rate of natural stone was less than 50%, so it could not make the most of natural beauty.

In addition, in this conventional method, since the cement block made of ordinary concrete not only has no voids, but also has a high proportion of cement portions in the surface layer, a large amount of water is required to spray and protrude the natural stone. Washed water was a kind of pollutant, so there were many problems with its treatment. In addition, the general cement blocks are produced with a high water-cement ratio, and thus generally have low resistance to freezing, durability and weakness against acidity. There is a problem that the binding force is weakened easily drop off from the surface layer.

In addition, the conventional method was to produce a block with a high slump, but since the slump is high, it is not easily separated from the mold after molding, thereby adding a bunch, and thus there is a problem that the defective rate is high in manufacturing. Due to these problems, the conventional method is not activated, and therefore, the cement block using natural stone is not activated.

The present invention has been made to solve the above problems of the conventional method to activate a cement block having a surface layer of natural stone, the basic object of the present invention is a natural stone texture such as natural stone beans, gravel, silica, artificial stone in a porous cement block By protruding the aggregate of, to provide a method for producing a porous cement block having a natural stone surface layer.

Another object of the present invention is to prevent the pollution caused by cement water as well as to prevent the pollution caused by the cement water by reinforcing water into the pores with the cement paste by sprinkling the cement by spraying on the surface layer, the reinforcing action against the pores To improve the strength, and because of this also has the effect of curing sprinkling so that the separate curing sprinkling process can be omitted.

Another object of the present invention is that the cement attached to the natural stone in the surface layer of the natural stone is washed with water and permeated into the pores, so that there is almost no cement site in the surface layer, so that the surface protrusion rate of the natural stone is 80% or more It is.

Another object of the present invention is to provide a low water-cement ratio, a slump close to zero, and a polymer treatment on the surface, so that it is excellent in freezing resistance, durability, and acid resistance, and at the same time, after molding in a mold, It is to be easily separated from the mold to reduce the defective rate.

Another object of the present invention is to vary the aggregate size of the surface layer and the lower base layer so that the natural stone aggregate of the surface layer is embedded in the pores of the lower base layer, and also the surface layer cement washed water (cement paste) is permeated through the pores to the lower base layer. Thus, the surface layer and the lower base layer are to be firmly bonded together.

The present invention for achieving the object is largely composed of four steps, the steps are as follows.

First process: Aggregate of natural stone bean gravel, jongseok, silica sand, artificial stone, etc., passing through 80-100% by weight in 10mm sieve and less than 10% by weight in 1mm sieve to form the surface layer of cement block: 1500- 2000kg / ㎥, Cement: 280-450kg / ㎥, Water: 80-150kg / ㎥, Admixtures (High Performance Water Resistant, General Water Resistant, High Fluidizing Agent): Mix the mixture of up to 4% by weight of cement into the mold with the bottom plate. Lightly vibrating the process,

Second process: Aggregate of 90-100% by weight in a 19mm sieve and 0-20% by weight or less in a 2.5mm sieve at the top of the mixture put into the mold in the electric process in order to form the lower base layer of the cement block. : 1400-2000kg / ㎥, cement: 250-400kg / ㎥, water: 80-150kg / ㎥, admixture (high performance water reducing agent, general water reducing agent, high fluidizing agent): a mixture containing 4% by weight or less of cement used After that, the step of covering the upper plate of the mold and then vibrating

Third process: turn over the mold into which the cement mixture of the electric process is put, remove the bottom plate from the bottom, and spray the minimum amount of water using strong spray to make the natural stone aggregate of the surface layer protrude more than 80%. At the same time the process of allowing the cement paste washed in water to seep through the pores, and

Fourth process: After cement curing for about 10 hours and atmospheric curing for about 24 hours according to the conventional method for cement blocks formed in the electrical process, the surface is reinforced by spraying epoxy, urethane or unsaturated resin in the air condition. It is a process to make it.

In the first process and the second process of the present invention, the mixture of the surface layer is first introduced and the base-based groove compound is introduced at the top thereof. The reason is that when the mold is turned over in the third process, the cement paste of the surface layer becomes the base layer. This is because the remnants of the natural stone gravel are gathered to be assembled by vibration and consequently improve the surface strength. In addition, if the vibration is applied upside down, there is an advantage that the level of the surface layer is improved.

However, the first and second processes do not necessarily have to be done in this order, and the order may be changed for convenience. On the other hand, when it is necessary to reduce the thickness to 3 cm for the purpose of the product, the product may be produced only by the surface layer. In this case, the second process is omitted.

In the first process, in order to color the block, the pigment should be added to 10% by weight or less of the amount of cement used. In order to give gloss or reflect light to the block, crushed waste glass of natural stone size should be used. It may be added at 30% by weight or less. On the other hand, in order to give the surface elasticity, the waste tires of the same size as natural stone gravel may be added to less than 30% by weight of the natural stone gravel usage.

In the first process, in order to prevent cracking or whitening, it is also possible to mix and use less than 100 mesh stone powder to less than 50% by weight of the cement usage, it is possible to reduce the amount of cement used by the amount of stone powder.

In the fourth process, the application of epoxy, urethane or unsaturated resins is intended to improve the surface strength, but the application of these resins results in a glossy surface. This process can be omitted if the gloss is not desired even if the strength is slightly reduced depending on the usage or consumer's preference.

The cement bricks of the present invention are all porous, but may be made permeable by adjusting the aggregate size of the lower base layer, or may be made non-permeable. When the size of the aggregate in the lower base layer is more than 10% by weight in the 2.5mm sieve, it is impermeable (less than 10x10 ^-2 cm / sec), and when it is passed in less than 10% by weight in the 2.5mm sieve, it is permeable (10x10 ^-2 cm / sec or more).

Blocks with porosity of 12% or more and permeable can be used as permeable sidewalk blocks, soundproof blocks, soundproof panels, etc., and non-permeable blocks with porosity of 7-12% can be used as nonpermeable sidewalk blocks and interior interior blocks. .

The present invention will be described based on the following examples.

EXAMPLE

In manufacturing blocks of 30 cm in length, 60 cm in width and 6 cm in thickness, light green crushed crushed stone is used as the aggregate of natural texture forming the surface layer. The surface layer of the block is 1.5 cm thick and the lower base layer is 4.5 cm thick. It decided to be as follows, and advanced the following process.

First step: preparing a mold and materials.

The size of the prepared template is 30 cm, 60 cm, and 6 cm in height and width, respectively. As a material of the surface layer, water: 95 kg / m 3, cement (white): 360 kg / m 3, light green seedstone (6-1 mm): 1750 kg / m 3, high performance water reducing agent: 3.6 kg / m 3 were prepared, and the material of the lower base layer As water, 105 kg / m 3, cement (general): 320 kg / m 3, aggregate (13-2.5 mm): 1680 kg / m 3, and water retardant: 0.16 kg / m 3 were prepared.

2nd process: process to inject cement mixture into mold

The materials of the surface layer prepared in the above process and the materials of the lower base layer were respectively mixed, and the mixture of the surface layer was first injected 1.5 cm into the mold and gently vibrated. Then, a mixture of the lower base layer was put on the upper surface layer, and the cover of the mold was pressed and vibrated to press to give a total thickness of 6 cm.

The 3rd step: spraying natural stone aggregate by spraying on the surface layer

Turn the mold into which the mixture of the electric process is put upside down and remove the bottom plate of the mold from above (preferably by sliding it sideways to prevent the surface from being damaged), and then use a strong spray to spray the natural stone on the surface with water. The natural stone protrusion rate was 80% or more. At this time, the amount of water used was minimized so that all the cement paste washed in the water penetrated into the voids and used so as not to overflow the mold.

4th process: curing process

After the cement block formed in the electrical process, steam curing is about 10 hours and atmospheric curing is about 24 hours according to a conventional method. In response, air curing was completed for 7 days.

The compressive strength porosity, permeability coefficient, and natural stone protrusion rate of the cement blocks completed by the above examples were examined. The results are shown in Table 1 below.

division Flexural strength (㎏ / ㎥) Porosity (%) Permeability coefficient (cm / sec) Natural Stone Extrusion Rate (%) Example 55 16.5 7.5x10 ^-1 94.2 standard 50 or more 12 or more 10 x 10 ^-2 80 or more

As shown above, the cement block of the present invention has a sufficient compressive strength required for pavement of sidewalks, bicycle paths or squares while at the same time deriving a natural texture by protruding more than 80% of the natural stone on the surface layer. In addition, since the cement block of the present invention is porous, it is also excellent in soundproofing effect, so it can be used not only for soundproof walls, but also for interior materials such as interior decoration.

Claims (7)

Aggregate mixed with one or two or more of natural stone bean gravel, jongseok, silica sand, artificial stone of 80-100% by weight in a 10mm sieve and 10% by weight or less in a 1mm sieve: 1500-2000kg / ㎥, cement: 280-450kg / m 3, water: 80-150kg / m 3, admixture: adding a mixture of 4% by weight or less of the amount of cement to a mold with a bottom plate and gently applying vibration; Aggregate of size: 1400-2000kg / m3, cement: 250-400kg / which passes through 90-100% by weight in a 19mm sieve and 0-20% by weight in a 2.5mm sieve at the top of the mixture put into the mold in the electric process. M 3, water: 80-150 kg / m 3, admixture: adding a mixture of 4% by weight or less of the amount of cement used, and then subjecting the upper plate of the mold to vibration pressurization; And Invert the mold into which the cement mixture of the electric process is put, remove the bottom plate from the bottom to the top, and spray the water so that the natural stone aggregate of the surface layer protrudes more than 80%, and the cement paste washed in the water penetrates into the voids. Cement block manufacturing method having a natural stone surface layer comprising a step. Aggregate size: 1400-2000kg / m3, Cement: 250-400kg / m3, Water: 80-150kg / m3, Admixture of 90-100% by weight in 19mm sieve and 0-20% by weight or less in 2.5mm sieve : Adding a mixture of 4% by weight or less of the amount of cement used, and then putting it in a mold with a bottom plate to vibrate lightly; On top of the mixture put into the mold in the electric process, one or two or more of natural stone soybeans, jongseok, silica sand, artificial stone of 80-100% by weight in a 10mm sieve and less than 10% by weight in a 1mm sieve is mixed. Aggregate: 1500-2000kg / m3, Cement: 280-450kg / m3, Water: 80-150kg / m3, Admixtures: After adding a mixture of 4% by weight or less of the cement used, cover the top plate of the mold, and then vibrate. Pressing process; And Removing the cover of the mold into which the cement mixture of the electrical process is put, and spraying water so that more than 80% of the natural stone aggregates of the surface layer protrude, and at the same time allowing the cement paste washed in the water to penetrate between the pores; Cement block manufacturing method having. Aggregate mixed with one or two or more of natural stone bean gravel, jongseok, silica sand, artificial stone of 80-100% by weight in a 10mm sieve and 10% by weight or less in a 1mm sieve: 1500-2000kg / ㎥, cement: 280-450kg / ㎥, water: 80-150kg / ㎥, admixture: a step of putting the mixture of 4% by weight or less of the cement used in the mold with a bottom plate to cover the cover and then vibrating pressurized; And Invert the mold into which the cement mixture of the electric process is put, remove the bottom plate from the bottom to the top, and spray the water so that the natural stone aggregate of the surface layer protrudes more than 80%, and the cement paste washed in the water penetrates into the voids. Cement block manufacturing method having a natural stone surface layer comprising a step. The method according to any one of claims 1 to 4, wherein the molded cement block is epoxy, urethane or unsaturated in a dry state after about 10 hours of steam curing and about 24 hours of air curing according to a conventional method. Spraying one or two or more of the resin to strengthen the surface; Cement block manufacturing method having a natural stone surface layer comprising a. The method for producing a cement block according to any one of claims 1 to 4, further comprising a natural stone surface layer in which crushed waste glass is added at 30% by weight or less of natural stone gravel usage as a material of the surface layer. The method for producing a cement block according to any one of claims 1 to 4, further comprising a natural stone surface layer in which crushed waste tires are added at 30% by weight or less of natural stone gravel usage as the material of the surface layer. The method for producing a cement block according to any one of claims 1 to 4, wherein the surface layer has a natural stone surface layer which adds 100 mesh or less of stone powder to 50% by weight or less of the amount of cement used.