KR20110049403A - Concrete water-permeable block using pore generator and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A concrete water-permeable block using a pore forming material and a manufacturing method thereof are provided to maintain high-strength by securing fine pores inside the block. CONSTITUTION: A concrete water-permeable block using a pore forming material is manufactured using aggregate, binder, and water. The concrete water-permeable block comprises carboxyl methyl cellulose, flour, starch, Arabia rubber, and one or more pore forming materials selected from glue. Pores are formed inside the block by burning the pore forming materials with 250~240.

Description

Concrete water-permeable block using pore generator and manufacturing method

The present invention relates to a concrete water flow block, and more particularly, in the manufacture of concrete blocks by mixing aggregates, binders and water, CMC, flour or starch, etc. is added as a pore-forming agent, and the pore-forming agent is burned at a high temperature to block By forming pores therein, the present invention relates to a concrete water passage block and a method of manufacturing the same having improved water permeability while maintaining high strength.

Recently, as urbanization progresses and the economy develops, the pavement rate as well as the roadway of India are increasing as part of resolving the inconvenience of living. As the sidewalks of large cities and parks, newly developed cities, and apartment complexes are packed with blocks that do not have excellent water flow, almost all of them are flowing into storm pipes or sewage pipes, putting pressure on the limits of the river's water capacity. As a result, sidewalk blocks that are not water-permeable in case of rain can cause water to quickly penetrate into large surface soils, causing heavy rain damage, forming river rapids, and causing problems such as bank collapse.

In order to increase the permeability of the concrete block, the ratio of coarse aggregates was increased to increase the porosity, but due to this, there was a problem in that fine powder such as soil filled the voids and gradually reduced the permeability.

Therefore, there is a demand for development of a method capable of securing strength for durability while securing appropriate pores in concrete.

Therefore, the inventors of the present invention, when manufacturing a concrete block, by adding a CMC, wheat flour or starch as a pore-forming agent to form a block, and the high-temperature treatment to burn the pore-forming agent, to form fine pores inside the concrete block, improved barrel The present invention was completed by discovering that a concrete water passage block having excellent durability and maintaining high strength can be manufactured.

An object of the present invention is a concrete water flow block manufactured by including aggregate, binder and water, comprising at least one pore-forming agent selected from CMC, wheat flour, starch, gum arabic and glue, the pore-forming agent is 250 ~ Combustion at 400 ℃ to provide a concrete water flow block characterized in that the pores are formed in the block.

Still another object of the present invention is to provide a method for preparing an aggregate comprising: (a) mixing aggregate, binder and water; (b) adding at least one pore forming agent selected from CMC, wheat flour, starch, gum arabic and glue; (c) kneading the mixture and filling the mold to form a concrete block at a pressure of 0.5 to 1.0 N / mm 2, and curing the mixture; (d) drying the cured concrete block at 100-120 ° C. for 2-4 hours; And (e) heating the dried concrete block at 250 to 400 ° C. for 3 to 4 hours to burn the pore-forming agent to form pores inside the block. will be.

In one embodiment, the present invention includes at least one pore-forming agent selected from carboxyl methyl cellulose (CMC), wheat flour, starch, gum arabic, and glue in a concrete water flow block made from aggregate, binder and water. In the present invention, the pore-forming agent combusts at 250 to 400 ° C., and relates to a concrete water passage block, wherein the pores are formed in the block.

Hereinafter, the configuration of the present invention in more detail.

In order to increase the water permeability (permeability) of the concrete block manufactured by including aggregate, binder and water, the water flow block of the present invention is prepared by adding a pore-forming agent and burning it at a high temperature to form pores inside the block. It is characterized by.

At this time, the aggregate, the binder and the pore-forming agent, which are the raw materials of the concrete water flow block, may be blended in an appropriate ratio to maintain a high strength and improve the water flow rate. For this purpose, the binder is preferably 20 to 40 parts per 100 parts by weight of the aggregate. It can be included in 0.01 to 5.0 parts by weight and pore-forming agent, more preferably 30 to 35 parts by weight of binder and 0.1 to 0.5 parts by weight of pore-forming agent per 100 parts by weight of aggregate.

Aggregates included in the manufacture of the water flow block of the present invention may be known aggregates that can be used in the production of concrete blocks, preferably sand, crushed stone, waste concrete, waste ceramics, waste glass, waste foundry sand, coal ash, slag, Combustion materials and mixtures thereof may be used, more preferably waste concrete is used for the use of recycled materials, but is not limited thereto.

In addition, the aggregate is preferably used in the form of a powder having an appropriate particle size, the particle size can be adjusted so that the molded water flow block has a suitable strength and water permeability. The larger the particle size distribution, the larger the porosity of the water flow block, which can lead to a higher permeability coefficient. However, the decrease in strength and the absorption rate also increase, making it more vulnerable to repeated freezing and melting, resulting in weak durability. Therefore, the particle size of the aggregate is preferably used 0.1 to 5.0 mm, preferably 0.1 to 3.5 mm can be used to 60 to 80% by weight of the total aggregate, more preferably the particle size of 0.1 to 1.0 mm may be 30 to 50% by weight of the total aggregate, but is not limited thereto.

The water flow block of the present invention may use cement, gypsum, lime and mixtures thereof as a binder, and the cement may use portant cement, back cement, slag cement or alumina cement, and the like. Binders for the production of concrete blocks can be used. In this case, the binder is preferably used in a fine powder form in order to improve the bonding strength with the aggregate and to facilitate the formation of pores.

In the present invention, the 'pore former' is a material for forming pores in the concrete block, CMC, wheat flour, starch, gum arabic and glue can be used, preferably CMC is used. These pore-forming agents burn at high temperatures and are discharged as combustion gases, thereby forming pores in the block body.

The pore-forming agent of the present invention is preferably added to have a high water permeability while maintaining the appropriate strength, preferably it may be included in 0.01 to 5.0 parts by weight per 100 parts by weight of aggregate, more preferably 0.1 to 0.5 parts by weight do. When the amount of the pore-forming agent is included too little, the porosity decreases and the water permeation effect is lowered. When the amount of the pore-forming agent is included too much, the porosity may increase and the strength may decrease.

In addition, the pore-forming agent of the present invention is preferably used by dissolving in an appropriate concentration in water, for example, can be used by dissolving at a concentration of 1.5 to 2.0%. The use of the pore-forming agent in pure water is intended to be uniformly distributed between the aggregate and the cement particles during mixing with the aggregate and the cement so that fine capillary pores are uniformly formed during combustion.

In the process of forming the pores of the concrete block by the pore-former, first, the pore-former component is uniformly attached to the surface of the raw material powder of the aggregate and the binder together with water in a state in which the pore-former component is dissolved in water in the raw material mixing process. Pore formers adhered evenly to the surface of the powder, when heated to the appropriate temperature, are burned on the surface of the powder particles to emit combustion gas, and form pores in the form of fine capillaries in the space occupied by the pore formers. Have Mercury.

Concrete passing block of the present invention preferably has a porosity in the range of 15 to 30%, more preferably 20 to 28%, but may vary depending on the purpose of use. If the porosity of the water flow block is 15% or less, the water flow efficiency may not be sufficient to perform a sufficient water flow function. If the water flow rate is 30% or more, the water permeability is increased, but the porosity is too high. In addition, the concrete water flow block of the present invention may have a permeability coefficient of 1.3 × 10 ⁻¹ to 1.6 × 10 ⁻¹ cm / sec, but may vary depending on the intended use.

The concrete water passage block of the present invention may further include a pigment for color development. The pigment may be a metal oxide, for example, iron oxide, titanium oxide, copper oxide, nickel oxide, manganese oxide, zinc oxide, cobalt oxide, etc., may be added when mixing the raw materials, or sprayed liquid pigment immediately after block molding It can be used by coloring the surface.

In still another aspect, the present invention provides a method for producing an aggregate comprising: (a) mixing aggregate, binder and water; (b) adding at least one pore-former selected from carboxyl methyl cellulose (CMC), wheat flour, starch, gum arabic and glue; (c) kneading the mixture and filling the mold to form a concrete block at a pressure of 0.5 to 1.0 N / mm 2, and curing the mixture; (d) drying the cured concrete block at 100-120 ° C. for 2-4 hours; And (e) heating the dried concrete block at 250 to 400 ° C. for 3 to 4 hours to burn the pore-forming agent to form pores inside the block. .

In the steps (a) and (b), the aggregate, the binder and the pore-forming agent can be adjusted so that the molded concrete block has an appropriate compressive strength and flexural strength and has improved water permeability, preferably per 100 parts by weight of aggregate. 20 to 40 parts by weight of the binder and the pore-forming agent may be included in 0.01 to 5.0 parts by weight, more preferably 30 to 35 parts by weight of the binder and 0.1 to 0.5 parts by weight of the pore-forming agent per 100 parts by weight of aggregate.

In addition, the pore-forming agent in step (b) is preferably used to prepare an aqueous solution of 1.5 to 2.0%, can be used by adding the aqueous solution to 10 to 20% by weight relative to the total raw material weight constituting the water flow block. have.

Step (c) is a step of forming and curing the block by filling the mixing raw material into the mold and applying a constant pressure. The pressure is sufficient that the raw material particles can have an appropriate fusion force without being too densified, preferably about 0.5 to 1.0 N / mm 2, but may be adjusted according to the composition of the component or the desired physical properties. In addition, the curing process may be carried out for 28 days at room temperature, or may be carried out for one to two days in a steam curing room with an internal temperature of 50 ~ 60 ℃.

In the step (d), the drying process is preferably performed by hot air drying at 100 to 120 ° C. for 2 to 4 hours to completely remove adsorbed water and the like present between the particles in the block. In hot air drying, it is preferable to raise the heating temperature sequentially.

Step (e) is a step of heating the dried concrete block for 3 to 4 hours at a high temperature to burn the pore-forming component contained in the block to form fine pores inside the block. In this case, the heating temperature is sufficient to be a temperature enough to burn the pore-former component, preferably 250 to 400 ℃, more preferably 300 to 350 ℃. In particular, when the pore-forming agent is CMC, the heating temperature is preferably 330 ℃. The heating temperature may be sequentially raised, for example, by about 50 ° C. per hour. After the heating process can be naturally cooled to room temperature slowly.

In addition, in order to express the color in the water flow block, a pigment may be added, and a metal or a nonmetal oxide may be used as the pigment. After the pigment is added in step (a) or after the curing process after step (c), the pigment is applied to the upper surface of the upper layer and then heated to express a unique color of the metal or nonmetal oxide.

Concrete water flow block according to the present invention can ensure the fine pores inside the block through the combustion of the pore-forming agent, it has improved water permeability while maintaining high strength.

In addition, since it exhibits high compressive strength and flexural strength, it has excellent durability even in the repeated process of freezing-thawing due to long-term seasonal changes.

In addition, the concrete water flow block manufacturing method according to the present invention has an economical effect because it is possible to produce a water flow block having excellent physical properties such as water permeability, strength and durability in a simple way to add a pore-forming agent and heated to burn.

Therefore, the high-strength water flow block of the present invention can be usefully used as a floor pavement that requires high strength and water permeability, for example, roadside sidewalks, parks, parking lots, driveways, bicycle pavement.

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. However, the following examples are provided to help the understanding of the present invention, and the scope of the present invention is not limited to the following examples. Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

Example  1. Concrete Water Flow Block Manufacture

In order to confirm the physical properties of the concrete water flow block according to the present invention and to determine the blending standard of each component, each component is divided into the mixing ratios as shown in Table 1 below and mixed separately, these are mixed and kneaded uniformly, and this is 100 × 100 × Compression molded at 100 MPa and 200 × 100 × 60 cubic mm sizes at 0.5 MPa pressure. These moldings were cured for 24 hours in a steam curing room having an internal temperature of 55 ° C. and naturally cooled for 24 hours. Thereafter, the resultant was placed in a heating furnace again and dried at 100 ± 5 ° C. for 3 hours, and then heated to 50 ° C. per hour to 330 ° C. for 3 hours. Then, after passing through the slow cooling process to cool the air temperature to prepare a concrete water flow block.

ingredient Aggregate (%) % Binder Pore former (%) Kinds Particle size \ Kinds
Formulation Number ＼ Waste concrete 3.5 mm or less Portland Cement CMC (1.5% aqueous solution) One 73 15 12 2 70 17 13 3 67 19 14 4 63 21 16 5 60 22 18

Example  2. Physical property inspection of concrete water flow block

Permeability coefficient, compressive strength, physical properties of compressive strength and flexural strength after freeze-thawing were examined for each water flow block prepared in Example 1 (Table 2). Specifically, the compressive strength test was conducted in accordance with KS F 2405 『Concrete compressive strength test method』, and the flexural strength test was evaluated in accordance with KS F 2408 『Concrete flexural strength test method』.

Molded to a size of 100 × 100 × 100 cubic mm was used for the measurement of absorption rate, compressive strength, compressive strength after freeze-thawing, and permeability coefficient, respectively, and moldings of 200 × 100 × 60 cubic mm were used for measuring the bending strength.

Item
＼
Formulation Number Permeability coefficient
(10 ^-1 cm / sec) Absorption rate
(%) Compressive strength
(MPa) Compressive strength after freeze-thawing (MPa)
(100 cycles after method B) Flexural strength
(MPa) One 1.3 2.7 10.4 7.9 3.2 2 1.4 2.5 15.2 12.2 3.9 3 1.5 2.3 20.2 16.0 4.5 4 1.5 2.2 24.0 19.8 4.9 5 1.6 1.9 26.7 21.5 5.3

As a result of measuring the physical properties, the permeability coefficient of the entire sample was 1.3 × 10 ⁻¹ cm / sec or more. However, the higher the aggregate compounding ratio and the lower the cement compounding ratio, the lower the compressive strength and the flexural strength. If the aggregate is 70% or less and the cement is 17% or more, there is no problem in durability.

Claims (12)

In the concrete water flow block manufactured by including aggregate, binder and water, CMC (carboxyl methyl cellulose), wheat flour, starch, gum arabic and at least one of the pore-forming agent selected from the glue, characterized in that the pore-forming agent was burned at 250 ~ 400 ℃ to form pores inside the block Concrete water flow block. According to claim 1, The aggregate, the binder and the pore-forming agent is characterized in that it comprises 20 to 40 parts by weight of the binder and 0.01 to 5.0 parts by weight of the pore-forming agent per 100 parts by weight of the aggregate, concrete water flow block. The concrete water flow block according to claim 1, wherein the aggregate is used so that a particle size of 0.1 to 3.5 mm is 60 to 80% by weight of the total aggregate. The concrete water flow block according to claim 1, wherein the aggregate is selected from the group consisting of sand, crushed stone, waste concrete, waste ceramics, waste glass, waste foundry sand, coal ash, slag, combustion ash, and mixtures thereof. The concrete water flow block according to claim 1, wherein the binder is selected from the group consisting of cement, gypsum, lime and mixtures thereof. The concrete water flow block of claim 1, further comprising a pigment. According to claim 1, The porosity of the water flow block is 25 to 30%, the coefficient of permeability is characterized in that the concrete water flow block is 1.3 × 10 ^-1 to 1.6 × 10 ^-1 cm / sec. (a) mixing the aggregate, binder and water; (b) adding at least one pore-former selected from carboxyl methyl cellulose (CMC), wheat flour, starch, gum arabic and glue; (c) kneading the mixture and filling the mold to form a concrete block at a pressure of 0.5 to 1.0 N / mm 2, and curing the mixture; (d) drying the cured concrete block at 100-120 ° C. for 2-4 hours; And (e) heating the dried concrete block at 250-400 ° C. for 3-4 hours to burn the pore-forming agent to form pores in the block, the manufacturing method of the concrete water passage block. The method of claim 8, wherein the pore-forming agent is prepared by using 1.5 to 2.0% aqueous solution of concrete. The method of claim 8, wherein the aggregate, the binder and the pore-forming agent are included in an amount of 20 to 40 parts by weight of the binder and 0.01 to 5.0 parts by weight of the pore-forming agent per 100 parts by weight of the aggregate. The method of claim 8, wherein the aggregate in step (a) is used to adjust the particle size so that the particle size is 0.1 to 3.5 mm 60 to 80% by weight of the total aggregate. The method of claim 11, wherein the aggregate in step (a) is used to adjust the particle size so that the particle size is 0.1 to 1.0 mm 30 to 50% by weight of the total aggregate.