KR20000015736A - Preparation method of boundary blocks by using waste concrete - Google Patents

Abstract

PURPOSE: A method for preparing boundary block is provided, which uses waste concrete, and has good durability and surface strength. CONSTITUTION: The boundary block is prepared by 1) pulverizing waste concrete to prepare waste concrete aggregate less than 19 mm; 2) spraying water to the pulverized waste concrete aggregate; 3) mixing the aggregate with cement in a range of 0.2-0.5 weight parts based on the 1 weight part of the waste concrete, water in a range of 0.03-0.08 weight parts based on the 1 weight part of the waste concrete and a mixing material less than 2 wt% based on the weight of the cement; 4) injecting the mixture into a mold and vibration-pressing it; 5) mixing fine aggregate of 1 weight part, cement in a range of 0.2-0.5 weight parts, water in a range of 0.03-0.08 weight parts, a mixing material less than 2 wt% based on the weight of the cement, and a dye less than 10 wt% based on the weight of the cement to prepare a surface material; 6) injecting the surface material prepared in step 5) into the material vibration-pressed in step 4) and vibration-pressing the mixture to make the surface material surround the upper face and at least the one side; releasing and drying the formant; and surface-dipping the formant with a resin selected from epoxy, unsaturated resin, urethane and acrylic resins.

Description

Method for manufacturing boundary block using waste concrete

The present invention relates to a method for producing a boundary block using waste concrete, and more particularly, by regrinding and selecting waste concrete generated from reconstructed building and old paving concrete, and using it for the manufacture of a sidewalk boundary block or a roadway boundary block. The present invention relates to a method for manufacturing a boundary block using waste concrete that is durable and obtains various colors.

Boundary block (or boundary stone) is a natural stone boundary block generally made by cutting natural stone, cement boundary block made by mixing cement and aggregate, boundary block made by grinding the surface using cement and cement and boundary block made of plastic Etc.

Boundary block made of natural stone has the advantage of high durability due to its strength, but has the disadvantage of high price and processing cost of the stone itself. In addition, the cement boundary block has the advantage that the price is cheaper than the natural stone boundary block, but the surface strength is weak, so that the surface is easily damaged or corroded by the impact or acid rain in many cases to damage the aesthetics of the street.

Boundary blocks manufactured by using feldspar and cement also have weak surface strengths, so that corners are damaged during polishing, and in particular, durability is lost due to surface peeling due to freezing and melting due to seasonal changes.

The plastic boundary block is not only difficult to construct, but also has a problem in that only a damaged part can not be replaced when damaged by an impact caused by a vehicle.

On the other hand, since natural stone boundary blocks, cement boundary blocks, abrasive boundary blocks and plastic boundary blocks cannot all reflect light, their existence is not easily recognized at night when the light is dark, so they cannot function properly as boundary blocks. There is this.

There is also a method of trying to reflect the light by attaching a luminous plate to the boundary block, which is not only cumbersome, but also has a disadvantage in that the luminous plate is easily broken because the boundary block is placed close to the ground.

In addition, since it is very difficult to color the boundary block or polished boundary block made of natural stone or cement, it is difficult to bring about an effect such as expressing various colors to freshen the urban aesthetics.

In the case of manufacturing the boundary block made of plastic, it is easy to color, but the plastic is not easily used as a substitute for the boundary block because its shape is easily broken by an impact.

The present invention has been made in order to solve the problems of the conventional boundary block, by using the waste concrete to provide a method of manufacturing a boundary block using a waste concrete that is excellent in durability and can provide a variety of colors and also excellent surface strength. Its purpose is to.

The present invention for achieving the above object 1) preparing waste concrete aggregate of less than 19mm by pulverizing the waste concrete;

2) watering the pulverized waste concrete aggregate;

3) mixing 0.2-0.5 parts by weight of cement, 0.03-0.08 parts by weight of water and 2% or less admixture based on the weight of cement, based on 1 part by weight of the waste concrete;

4) injecting the mixture produced in the immediately preceding step into the mold to press the first vibration;

5) admixture and cement weight within 2% by weight, based on 1 part by weight of fine aggregate, 0.2-0.5 part by weight of cement, 0.03-0.08 part by weight of water and cement weight, apart from steps 1) to 4) above Preparing a surface material by mixing less than 10% of the pigment as a standard;

6) subjecting the surface material prepared in step 5) to the upper part of the vibration pressurized material in step 4) to pressurize the secondary vibration so that the surface material surrounds the upper surface and at least one side surface;

7) releasing, drying and curing the molding produced in step 6); And

8) The method of manufacturing a boundary block using waste concrete comprising the step of surface impregnating the cured molding with a resin selected from the group consisting of epoxy, unsaturated resin, urethane and acrylic resin for surface treatment.

In addition, the present invention is characterized in that the pulverized waste concrete is passed through 100% in a 19mm sieve, 10-80% by weight in a 5mm sieve, 0-10% by weight in a 0.08mm sieve, characterized in that the manufacturing method of the boundary block using It is done.

In addition, the present invention is characterized in that the fine aggregate is less than 3mm and characterized in that the manufacturing method of the boundary block using waste concrete, which is a silica sand having a particle size passed by 3% by weight or less on the basis of the percentage of passage in 0.08mm sieve.

In another aspect, the present invention is characterized in that the method of curing in step 7) is characterized in that the manufacturing method of the boundary block using waste concrete which is steam curing, atmospheric curing or heating curing.

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

The waste concrete collected in step 1) is pulverized and sorted to prepare recycled aggregates that pass 100% in 19mm sieves, 10-80% in 5mm sieves, and 0-10% in 0.08mm sieves, based on the percentage of weight passed.

In the step 2), the powdered water is sprinkled on the waste concrete. The reason is that there is a fear of a significant drop in strength when absorbing the appropriate moisture supplied during curing after producing the boundary block from the aged cement. This is not a problem because it is necessary to live watering.

0.2-0.5 parts by weight of cement in 1 part by weight of the sprinkled crushed concrete in step 3), water is 0.03-0.08 parts by weight based on the surface dry saturation state of the used recycled aggregate and used aggregate, and the concrete admixture is It is used within the range of 2%, and new aggregate or sand of the same standard can be used if necessary, and it is used within the range of 50% of the recycled aggregate used.

In step 4), the material prepared as described above should be weighed and mixed into the mold, and vibrated and pressurized with the upper press plate. Here, the material for the surface layer is a layer that must directly correspond to the gas phase action, external pressure, foreign matter and chemical action, etc., and excellent materials should be used, and the mixing should also be careful.

In step 5), sand having a homogeneous particle size may be used separately from steps 1) to 4), and the specification uses less than 3mm and aggregates of less than 3% based on the percentage of the weight passing through at 0.08mm. 1 part by weight of silica sand 0.2-0.5 parts by weight of cement, 0.03-0.08 parts by weight of water, admixture is used within the range of 2% of the weight of the cement, pigments can be used for the color and the pigments used are weather resistant Strong inorganic pigments are used, and the amount of pigment used should be within 10% of the weight of cement.

In step 6), the prepared material is weighed and mixed, put in the upper part of the vibration pressurized material in step 4), and the surface is cleaned, and then vibrated and pressurized by the upper pressing plate to surround the upper surface and at least one side.

In step 7), the upper pressurizing plate and the mold of the press-molded molding are removed and cured. At this time, the porosity of the surface layer should be within 5% or more and less than 15%. It is for. At this stage, curing is selected by steam curing, air curing or heating curing, and the surface should be air dried during surface polymer treatment.

After confirming that the surface layer is in air condition in step 8), perform surface treatment. For surface treatment, apply 0.1-1.0kg / m2 with spray spray or brush with epoxy, unsaturated resin, urethane, acrylic resin, etc. Completed by penetration. In addition, when the viscosity of the polymer to be used is inconvenient to use, the diluent may be mixed and used in a range that does not affect the strength, and the amount of the diluent is preferably not more than 50% of the polymer used.

Hereinafter, the present invention will be described based on Examples.

(Example)

Green type B and SA type boundary blocks were prepared.

Stage 1

In order to manufacture the block according to the present invention, a mold and a block block upper pressurizing plate for a B type sidewalk were prepared, and an upper block pressurizing plate for a SA type driveway.

2) Step

The recycled concrete using the recycled aggregate was weighed and mixed.

1200 kg of recycled aggregate and 850 kg of concrete sand, which pass 100% in a 19mm sieve, 30% in a 5mm sieve, and 3.5% in a 0.08mm sieve, are used as aggregates. Cement 420kg, water 85kg, admixture 2 kg was weighed and mixed using a dispersant.

Step 3)

The recycled concrete was put into the mold. And the recycled concrete prepared in the mold was added to a certain thickness.

4) Step

The pressure plate was loaded and vibrated to compact the recycled concrete of the mold, and then the pressure plate was removed. At this time, the shape of the surface became the same as that of the upper pressing plate.

5) Step

The surface layer material was prepared. Here, 1720 kg of No. 4 silica (3 mm or less), 380 kg of cement, 75 kg of water, 3.8 kg of admixture (water reducing agent), 25 kg of pigment (green) were measured and mixed.

6) Step

The surface layer material was put into a mold containing recycled concrete. Here, the recycled concrete was lowered from the initial input state due to the upper load and vibration. And the surface layer material injected was vibrated and pressurized.

7) Step

The mold was removed while the upper pressure plate was placed, and the surface was dried by curing in the atmosphere after 1 day in the steam.

8) Step

When the surface was treated with epoxy, the solid content was 60% (40% mixed with the diluent), and 0.7 kg per m 2 was sprayed to coat the surface with vinyl for easy construction on site.

In this way, the boundary block using green waste concrete was completed.

As described above, the boundary block using the waste concrete according to the present invention may have excellent durability and various colors, and may also have an excellent surface strength.

Claims (4)

1) crushing the waste concrete to prepare the waste concrete aggregate of less than 19mm; 2) watering the pulverized waste concrete aggregate; 3) mixing 0.2-0.5 parts by weight of cement, 0.03-0.08 parts by weight of water and 2% or less admixture based on the weight of cement, based on 1 part by weight of the waste concrete; 4) injecting the mixture produced in the immediately preceding step into the mold to press the first vibration; 5) admixture and cement weight within 2% by weight, based on 1 part by weight of fine aggregate, 0.2-0.5 part by weight of cement, 0.03-0.08 part by weight of water and cement weight, apart from steps 1) to 4) above Preparing a surface material by mixing less than 10% of the pigment as a standard; 6) subjecting the surface material prepared in step 5) to the upper part of the vibration pressurized material in step 4) to pressurize the secondary vibration so that the surface material surrounds the upper surface and at least one side surface; 7) releasing, drying and curing the molding produced in step 6); And 8) A method for producing a boundary block using waste concrete comprising the step of surface impregnating the cured molding with a resin selected from the group consisting of epoxy, unsaturated resin, urethane and acrylic resin for surface treatment. The method of claim 1, wherein the pulverized waste concrete passes 100% in a 19 mm sieve, 10-80 wt% in a 5 mm sieve, and 0-10 wt% passes in a 0.08 mm sieve. The method of claim 1, wherein the fine aggregate is 3mm or less and has a particle size of silica sand having a particle size of 3% by weight or less based on the percentage of passage in a 0.08mm sieve. According to claim 1, wherein the method of curing in step 7) is a method of producing a boundary block using waste concrete which is steam curing, atmospheric curing or heating curing.