KR101420277B1 - Composition and method for manufacturing hume pipe under no-centrifugation and no-vibration mode - Google Patents

Abstract

The present invention relates to a hume tube composition which can be formed into a centrifugal and non-vibration type, and a method of manufacturing a hume tube using the same. Since the centrifugal method is not applied, there is no occurrence of sludge during the manufacturing process and a high quality high strength concrete hume pipe product And a method for manufacturing a humidifier tube using the same.
The Hume tube composition according to the present invention comprises 150 to 400 parts by weight of an aggregate, 0.5 to 2.5 parts by weight of a crude steel fluidizing agent, 0.1 to 0.5 parts by weight of an anti-segregation agent, 0.1 to 5 parts by weight of a resin for elastic concrete, By weight based on the weight of the binder, and the aggregate is composed of coarse aggregate and sand having a diameter of 13 mm to 40 mm, and the aggregate of sand And 30 to 90% by weight with respect to the thick aggregate.
In addition, the present invention relates to a process for preparing a hume tube composition, which comprises heating the composition to 20 DEG C / hr, heating the mixture to 60 DEG C, curing the mixture at 60 DEG C for 3 hours, The present invention provides a method of manufacturing a humidifier pipe.

Description

[0001] The present invention relates to a composition for the manufacture of a humidifier tube which can be molded in a centrifugal and non-vibrational manner, and a method for manufacturing a humidifier tube using the same.

The present invention relates to a composition for the production of a hume pipe which can be molded in a centrifugal and non-vibration mode, and a method for manufacturing a hume pipe using the same. By not using the centrifugal molding method, sludge is not generated during the process, The present invention relates to a composition for the manufacture of a concrete hume pipe and a method for manufacturing a hume pipe using the same.

Generally, a hume pipe is made of a concrete body, which is made of concrete and is formed so as to secure an internal passage, for example, a water passage, and is buried in the ground of a necessary construction site. It is mainly used for drainage pipes used for passing agricultural water, water supply / drainage, or waste water.

In the process of manufacturing such a concrete hump tube, first, the concrete mixture is formed by centrifugal molding through centrifugal molding for about 15 to 30 minutes, after which it is immersed for 3 to 4 hours and then heated to 80 ° C. at a rate of 20 ° C./hr , Followed by a curing process for about 4 to 6 hours.

As a composition for producing such a vapor-cured hume tube, for example, there is a composition described in Japanese Patent No. 10-0669477 entitled " Cement composition and method for producing concrete and concrete product using the same, " The composition is prepared by adding 3 to 15% by weight of calcium oxide converted to CaO to Portland cement or mixed cement obtained by crushing a lump of quick lime having a consumption of 4N hydrochloric acid of 70 to 500 ml at a brain specific surface area of 3000 cm ² / Cement composition.

However, the manufacturing process of the concrete hume pipe through the high-speed centrifugal forming method as described above requires a long time to manufacture, the inner and outer surfaces are not cleanly formed, the dimension is unstable, the low strength product, the steam curing time is delayed .

Also, since the centrifugal molding facility is expensive and most factories have only one centrifugal molding mold for each size, the production amount is limited

In addition to the disadvantages described above, a large amount of sludge, which is a mixture of water and cement, is discharged in the centrifugal molding process of the concrete hump tube. In this sludge, a large amount of cement is mixed to cause a problem of material loss, Most of the generated sludge is landfilled or treated as waste. In this process, the sludge has a problem of polluting surrounding soil when it is filled with strong alkali of pH 12 ~ 16, and when the sludge is not removed, There was also a problem of soil and water pollution when buried.

On the other hand, Japanese Patent No. 10-0967411, entitled " Underwater Insulated High Intensity Mortar Composition Using Olivine, "as a mortar for underwater curing, uses crude steel cement, CSA, gypsum, Since the freshness appears in 24 hours, a repair mortar for promoting this is disclosed.

However, the mortar as described in the above patent is too high in viscosity to be suitable for the production of a humid tube which has both fluidity and viscosity at the same time, so that the separation of the material and the filling property must be ensured.

Japanese Patent Application Laid-Open No. 2007-269591 discloses a composition using four kinds of low-temperature portland cement together with slag powder, silica fume and limestone powder for the purpose of preventing material separation. However, when a material separation preventing agent of the kind used in the composition disclosed in the above patent publication is used, it has a disadvantage that the resistance to cracking is very weak.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the problems of the prior art described above, and it is an object of the present invention to provide a composition for manufacturing a hume pipe which can solve various problems caused by application of a centrifugal molding method in the production of a concrete hume pipe, And a method of manufacturing a humidifier tube using the same.

The present invention provides, as a technical means for accomplishing the above object, the present invention provides a process for producing a composite material comprising a binder, 150 to 400 parts by weight of an aggregate, 0.5 to 2.5 parts by weight of a crude steel fluidizer, 0.1 to 0.5 parts by weight of a material- 1 to 5 parts by weight of a resin for concrete, 0.1 to 0.5 parts by weight of a water permeation inhibitor, and 19 to 45 parts by weight of water per 100 parts by weight of a binder, The aggregate is composed of a coarse aggregate having a diameter of 13 mm to 40 mm and sand, and is capable of being formed in a non-centrifugal and non-vibrational manner, in an amount of 30 to 90 parts by weight per 100 parts by weight of an aggregate having a large amount of sand.

In addition, the present invention provides a method of manufacturing a hume pipe by molding in a mold using a composition for making a hume pipe, in a centrifugal and vibration-free manner.

According to the present invention, there is provided a composition for preparing a humectant tube which can be molded in a centrifugal and non-vibration mode, and a method for manufacturing a humectant tube using the same.

First, since the centrifugal molding method is not applied to the humdrum tube according to the present invention, the sludge is not generated during the molding process, the productivity is improved owing to the omission of the sludge removing process, and a problem of loss of a large amount of raw material in sludge discharge is eliminated , And solves the problem of environmental pollution due to sludge treatment.

Secondly, since the Hume tube according to the present invention does not employ a centrifugal molding method, it does not require an expensive centrifugal molding facility, and thus there is an economical effect because it does not use enormous power.

Third, since the composition for making a hume pipe according to the present invention is capable of producing a high strength hume pipe, even if the thickness of the hume pipe concrete is thinly formed, it is possible to satisfy the strength standard, thereby reducing the amount of material used.

Fourth, the method of manufacturing a humidifier pipe according to the present invention has a simple process, shortened curing time, and improved productivity.

Fifth, the composition for the production of a hume tube according to the present invention and the method for manufacturing the hume tube are not required to be subjected to a separate finishing process because the inner and outer surfaces are cleanly formed and the dimensions are accurately formed, and no sludge is formed. There is also an effect that soil and water pollution do not occur even after burial.

Sixth, the composition according to the present invention for preparing a hume tube and the method for preparing the hume tube are more than 30% higher in resistance to cracking than the hume tube prepared by the composition for preparing a general centrifugal Hume tube, and excellent in chemical resistance against acid and alkali resistance .

FIG. 1 is a process flow chart schematically showing a method of manufacturing a Hume pipe according to an embodiment of the present invention.
FIG. 2 is a graph showing the results of dynamic elastic modulus tests of a hub tube formed in a centrifugal and non-vibration mode according to an embodiment of the present invention.

Hereinafter, the present invention will be described more specifically.

The present invention relates to an adhesive composition comprising 150 to 400 parts by weight of an aggregate, 0.5 to 2.5 parts by weight of a crude steel fluidizing agent, 0.1 to 0.5 parts by weight of a low viscosity material separation preventing agent, 1 to 5 parts by weight of a resin for an elastic concrete, And 0.1 to 0.5 parts by weight of a water permeation inhibitor, wherein the aggregate is capable of being formed into a non-centrifugal and non-vibrational manner containing 19 to 45% by weight of water based on the weight of the binder, wherein the aggregate has a diameter of 13 mm to 40 mm The present invention provides a composition for the production of hume tubes, which can be formed in a non-centrifugal and non-vibrational manner, comprising coarse aggregate of sand and sand, and 30 to 90 wt% of coarse aggregate with a large amount of sand.

Preferably, in the composition for producing hume pipes of the present invention, the binder is mainly composed of Portland cement, and further comprises at least one of blast furnace slag fine powder, fly ash, and silica fume.

Preferably, the binder comprises 40 to 80% by weight of Portland cement, 3 to 20% by weight of blast furnace slag, 3 to 20% by weight fly ash, and 3 to 20% by weight of silica fume, do.

Preferably, in the composition for the production of a hume tube of the present invention, at least one of a cellulose-based thickener, a starch-based thickener or fiber, and an acryl-based thickener is applied do.

Preferably, in the composition for the production of a hume tube of the present invention, the resin for elastic concrete is selected from the group consisting of VAE (Vinyl Acetate Ethylene), EVA (Ethylene Vinyl Acetate), SBR (Styrene Butadien Rubber) , And an aqueous acrylic resin (s).

Preferably, in the composition for the production of a hume tube of the present invention, the above-mentioned permeability inhibitor is at least one selected from the group consisting of a metal salt, a stearate series, a silane series, and a siloxane series.

Preferably, in the composition for producing hume tub of the present invention, the crude steel fluidizing agent is a polycarboxylate ether.

The present invention also provides a method for preparing a humectant tube according to the present invention; Introducing the composition for making a hume pipe into a mold for molding a cylindrical hume tube, and raising the temperature to 60 占 폚 at a rate of 20 占 폚 / hr; The composition for preparing a hume tube housed in the mold is cured at 60 ° C for 3 hours; And a concrete hump tube is obtained by separating the hump tube from the mold. The present invention also provides a method of manufacturing a hump tube that is formed by a centrifugal and non-vibration method.

The present invention also provides a humectant tube formed from the composition for preparing a humectant tube according to the present invention.

The composition for preparing a fume tube according to the present invention comprises 150 to 400 parts by weight of an aggregate, 0.5 to 2.5 parts by weight of a crude steel fluidizing agent, 0.1 to 0.5 parts by weight of an anti-segregation agent, 1 to 5 parts by weight of a resin for elastic concrete, and 0.1 to 0.5 parts by weight of a waterproofing agent, and 19 to 45% by weight of water based on the weight of the binder. In the composition for preparing a hume pipe according to the present invention, the aggregate is composed of coarse aggregate having a diameter of 13 mm to 40 mm and sand, and the amount of sand is 30 to 90% by weight with respect to a coarse aggregate.

The binder is mainly composed of cement, and further comprises at least one of blast furnace slag, fly ash, and silica fume. Preferably, the binder contains 40 to 80 wt% of cement, 3 to 20% by weight of slag, 3 to 20% by weight of fly ash, and 3 to 20% by weight of silica fume. The cement is preferably a one-component Portland cement (KS F 5201. TYPE 1).

The blast furnace slag may be obtained by pulverizing granulated water-chain slag obtained by quenching molten slag produced at the same time as pig iron in a blast furnace during the blast furnace operation of a steel mill with water, and adding gypsum according to the purpose of use. Mixing such fine blast furnace slag powders improves long-term strength, improves watertightness, and inhibits corrosion of reinforcing bars due to inhibition of chloride ion penetration.

The blast furnace slag is preferably contained in an amount of 3 to 20% by weight based on 100% by weight of the entire binder. When the blast furnace slag is contained in an amount of less than 3% by weight, the effect thereof is insignificant. May be lowered and the curing time is prolonged, which is uneconomical.

The fly ash is a particle of a specific particle size obtained by collecting coal ash contained in waste gas discharged when coal is used as a fine powder fuel in a combustion boiler such as a thermal power plant. This is the hydration life of Portland cement, which fixes the calcium hydroxide or alkali hydroxide mixture which is present in the void structure in the cement paste and precipitates together with the permeating water to fill the void in the cement paste to improve the permeability of the concrete, Thereby contributing to the improvement of the strength and durability of the concrete.

The fly ash is preferably contained in an amount of 3 to 20% by weight based on 100% by weight of the entire binder. If the fly ash is contained in an amount of less than 3% by weight, the effect is insignificant. May be decreased.

The silica fume is an industrial by-product from an electric arc furnace used in the production of silicon metal or a silicon alloy. This silica fume contains more than 80% of silica mainly amorphous crystals and is composed of very fine but spherical particles (average particle diameter 0.1 μm). In addition, the chemical composition of this silica fume is amorphous SiO ₂ more than 90%, and it has a positive effect on the long-term strength increase of the concrete because it causes a pozzolanic reaction very effectively because of a large amount of silica.

The silica fume is preferably contained in an amount of 3 to 20% by weight based on 100% by weight of the entire binder. If the silica fume is contained in an amount of less than 3% by weight, the effect is insignificant. If the silica fume is more than 20% by weight, .

The crude steel fluidizing agent is used for the purpose of expressing the early strength of concrete, and it is preferable that 0.5 to 2.5 parts by weight of the same is included in 100 parts by weight of the binder. If the crude steel fluidizing agent is contained in an amount less than 0.5 part by weight, the fluidity is deteriorated and the workability is deteriorated, and the water reducing rate is low, so that the strength is not good. If the amount is more than 2.5 parts by weight, the material is separated due to excessive fluidity, , And the tip portion is weakened due to the occurrence of bleeding, which is not good because it can break.

The crude steel fluidizer includes a polycarboxylate ether, and preferably includes a polycarboxylate ether (MVA 2500, BASF, Germany).

The material separation preventing agent is used for the purpose of preventing the concrete from separating from the material, and it is preferable that the amount of the material separation preventing agent is 0.1 to 0.5 parts by weight based on 100 parts by weight of the binder. At this time, if the amount of the material separation preventing agent is less than 0.1 part by weight, the material is separated and the amount of the bleeding is not good. If the amount exceeds 0.5 part by weight, the filling property is deteriorated due to the excessive viscosity, It is not good.

Examples of the material separation preventive agent include cellulose derivatives such as HPMC (Hydroxy Propyl Methyl Cellulose), Hydroxy Ethyl Methyl Cellulose (HEMC), HEC (Hydroxy Ethyl Cellulose) and CMC (Carboxy Methyl Cellulose) Series thickener; Starch series thickeners such as amylase, glucoamylase or Pullulanase; fiber; And at least one of a partial hydrolyzate of polyacrylamide or an acrylic series thickener such as a copolymer of acrylamide and sodium polyacrylate is used.

The resin for elastic concrete is used for the purpose of enhancing the crack resistance index which is a weak point of the existing hume pipe, improving the compressive strength and improving the waterproof performance, and it is preferably 1 to 5 parts by weight based on 100 parts by weight of the binder . If the amount of the resin for elastic concrete is less than 1 part by weight, the cracking resistance index is lowered, the strength is lowered, the waterproofing performance is not good, and if it exceeds 5 parts by weight, the waterproofing performance and elastic modulus are improved and the quality is improved. Can not do it.

In addition, the resin for elastic concrete can be used as a binder resin such as VAE (Vinyl Acetate Ethylene), EVA (Ethylene Vinyl Acetate), SBR (Styrene Butadien Rubber), and polyacrylamide Or an aqueous acrylic resin such as a copolymer of acrylamide and sodium polyacrylate, and the like. Among them, VAE (Vinyl Acetate Ethylene: Vinyl Acetate Ethylene: Quot; ETONIS " manufactured and sold by Wacker) is most preferably applied.

Generally, an epoxy or a polyurethane resin is mainly used as a resin for elastic concrete. Making an elastic body by this method is not suitable because it is expensive, and it is not applicable to water-soluble cement, mortar or concrete. The resin for elastic concrete used in the composition for the preparation of a centrifugal Hume tube according to the present invention is a resin developed in Germany BACKER (WACKER). It is economical because it can be applied to concrete as much as necessary with a resin, and the content of vinyl acetate is high, Low water-soluble products.

The water permeability inhibitor is used for improving the waterproofing performance of the humdrum tube so as to prevent water from penetrating and to increase the durability of the humidifier tube, and it is preferable that the waterproofing agent contains 0.1 to 0.5 parts by weight based on 100 parts by weight of the binder. At this time, if the antifouling agent is contained in an amount of less than 0.1 part by weight, the effect is insignificant. If the antifouling agent is contained in an amount exceeding 0.5 part by weight, the waterproof performance is improved, but the strength is lowered.

In addition, the permeability inhibitor may be selected from the group consisting of a stearate series which is a metal salt such as zinc stearate and calcium stearate, and aminopropyltriethoxysilane (Silquest A-1100, Momentive Performance Materials Inc (Dowcorning FS-1265, 300 to 10,000 CST), ethyl methyl, methyl (2-phenylpropyl) siloxane (Dowcorning 56 Additive), poly Siloxane series such as dimethyl siloxane (Shin-etsu, KF-96, 10 to 100,000 CST) or dimethylmethyl (polyethylene oxide acetate-capped) siloxane (Dowcorning 57 Additive) are used. Preferably, metal salt stearate is used as the permeability preventing agent. In this case, water repellency and water penetration are prevented to ensure waterproof and water repellent performance. Preferably, a siloxane-based or silane-based water-repellent agent is used as the permeability-preventing agent. In this case, it is possible to prevent intrusion of water, thereby ensuring long-term durability.

By using a specific amount of the fluidizing agent and the specific material separation preventing agent in the composition of the present invention for improving the workability and enhancing the strength of the humectant tube while preventing the material separation during the work, Making it possible to manufacture a Hume tube by centrifugal and non-vibration methods.

The inventors of the present invention have found that unlike the conventional production of a humidifier pipe using a fluidizing agent having a low fluidization performance and a high viscosity material separation preventing agent due to the characteristics of the process, By using a low viscosity thickener as listed above as the separation inhibitor in the same amounts as those specified above, a humid tube was prepared in a non-centrifugal and vibration-free manner. As described above, in the present invention, the composition for preparing a hume pipe must have both fluidity and viscosity so as to prevent material separation and fillability at the time of work and to have a smooth surface when the mold is demolded. Therefore, Of a fluidizing agent and a specific material separation preventing agent are used.

In addition, in the present invention, ordinary one kind ordinary portland cement which is economical is used, and elasticity resin is applied thereto to enhance the resistance against cracking. Generally, products such as hume pipes are mainly buried underground. Such underground environment contains a large amount of water. In the case of sewage pipes, it is difficult to secure long-term durability performance due to corrosion by H ₂ S gas. However, in the composition for preparing hume pipes of the present invention, it is possible to prevent waterproofing performance and concrete corrosion caused by H ₂ S by using an elastic resin, and to resist vibration caused by an earthquake or the like.

The manufacturing process of the Hume pipe which is formed by the centrifugal and non-vibration method using the composition for making a hume pipe is as follows.

First, 150 to 400 parts by weight of an aggregate, 0.5 to 2.5 parts by weight of a crude steel fluidizing agent, 0.1 to 0.5 parts by weight of an anti-segregation agent, 1 to 5 parts by weight of a resin for elastic concrete, 0.1 to 0.5 parts by weight of a binder is mixed with 19 to 45% by weight of water based on the weight of the binder to prepare a composition for the manufacture of a hume pipe. The aggregate is composed of coarse aggregate and sand having a diameter of 13 mm to 40 mm, To 30% by weight to 90% by weight with respect to the coarse aggregate (S10).

Then, the composition for preparing a hume pipe is put into a mold for molding a cylindrical hume pipe, and the composition for preparing a hume pipe housed in the mold is heated to 60 ° C at a rate of 20 ° C / hr (S20).

Thereafter, the composition for preparing a hume pipe housed in the mold is cured for 3 hours while maintaining the temperature at 60 ° C (S30). Therefore, the composition can be shortened by 1 to 3 hours as compared with the conventional composition for producing a vapor-grown hume tube with a curing time of 4 to 6 hours.

Thereafter, in the process of separating the hume pipe from the mold (S40), the manufacture of the hume pipe formed by the centrifugal and non-vibration method is completed. At this time, if the vibration is applied to the mold, the molded hume pipe may easily be demoulded.

Hereinafter, the present invention will be described concretely with reference to examples, but the present invention is not limited thereto.

< Example  >

Step 1: A binder composed of 400 kg of the first type Portland cement, 40 kg of the blast furnace slag, 40 kg of the fly ash, and 40 kg of the silica fume, and 725 kg of sand, 1,000 kg of gravel, 155 kg of water, 7.5 kg of crude steel- 1 kg of a starch-based material separation preventing agent, 10 kg of a resin for elastic concrete, and 1 kg of a permeability inhibitor were mixed to form a composition for preparing a hume pipe.

Step 2: The composition for preparing a hume tube formed in the above step 1 was put into a cylindrical mold capable of producing a hume tube having an inner diameter of 120 cm, and then heated to 60 캜 for 3 hours under the condition of 20 캜 / hr.

Step 3: The composition for preparing a hume pipe housed in a mold was cured for 3 hours at 60 ° C.

Step 4: The concrete hume pipe after the curing process was obtained through the de-molding process of the formwork, and the non-centrifugal and vibration-free hume pipe products were obtained.

< Comparative Example  >

Step 1: A binder composed of 460 kg of cement and 40 kg of blast furnace slag is mixed with 691 kg of sand, 1,100 kg of gravel, 170 kg of water and 5 kg of fluidizing agent to form a composition for producing hume tub.

Step 2: The composition for making a hume tube formed in the above step 1 was put into a cylindrical mold capable of producing a hume tube having an inner diameter of 120 cm, and a half of the composition for preparing a hume tube was put in, followed by primary centrifugation for 10 minutes Respectively.

Step 3: After the first centrifugal molding, the sludge on the inner wall of the cylindrical humidifier tube was removed.

Step 4: The remaining amount of the composition for making a hume pipe was put into the cylindrical mold and then subjected to secondary centrifugation for 7 minutes.

Step 5: After the second centrifugal molding, the sludge on the inner wall of the cylindrical humidifier tube was removed and finishing work such as dimensional correction was performed.

Step 6: The concrete hump tube was held for 4 hours.

Step 7: The temperature was raised to 80 占 폚 under the condition of 20 占 폚 / hr for 4 hours.

Step 8: Curing was carried out at 80 ° C for 4 hours.

Step 9: Cement hume pipe after curing process was obtained concrete dehumidifier product through de-molding process.

As described above, according to the embodiment of the present invention, since the centrifugal forming method is not applied to the Hume tube which is formed by the centrifugal and non-vibration method, the sludge is not generated during the molding process, It is possible to prevent the loss of material due to the sludge waste, and it is economical and does not cause a problem due to a large amount of sludge waste treatment.

Also, according to the embodiment of the present invention, the production process is simplified and the processing time of each process is short, thereby improving the productivity.

In addition, according to the embodiment of the present invention, the inner tube and the outer tube are formed in a non-centrifugal and vibration-free manner, and the inner tube and the outer tube are cleanly formed. There was an effect that the finishing process was not required.

In addition, according to the embodiment of the present invention, since the Hume pipe which is formed by the centrifugal and non-vibration type can be formed into a high strength, the thickness of the concrete hume pipe can be thinly formed. In such a high strength concrete, C, it was possible to shorten the molding time by one hour, and productivity was improved.

< Test Example  1>

Table 1 shows the test values of each concrete hume pipe manufactured through the above examples and comparative examples.

 Item   Example   Comparative Example  Curing temperature  60 ° C  80 ℃  Curing time  3 hours  4 hours Compressive strength SC (steam curing)
AC (autoclave curing) 58
91 44
78  Modulus of elasticity 6.10 x 10 ⁴ 4.10 x 10 ⁴  PH of Concrete   12   12  Sludge generation amount   0kg   78kg  Crack resistance index   130%   100%  Inner state   Clean without sludge   Sludge remaining necessitates finishing work  Inner Diameter Size   120.0 cm (uniform)   119 to 120.5 cm (non-uniform)

Compared with the concrete hume tube manufactured according to the comparative example, the concrete hume tube manufactured according to the embodiment of the present invention exhibited a compressive strength of more than 30%, a modulus of elasticity increased by 50%, a crack resistance index Was also increased by 30%. In particular, it was found that the compressive strength was steadily increased even in the steam curing and autoclave curing.

In the case of the embodiment of the present invention which was formed by the centrifugal method in comparison of the inner surface state, the sludge was clean without sludge formation, but in the case of the comparative example formed through the centrifugal molding method, a large amount of sludge was contained. A separate finishing process was required.

In addition, the inner diameter was uniformly formed at 120 cm in the embodiment of the present invention, but it was formed in the range of 119 to 120.5 cm in the comparative example, indicating that the dimensions were uneven.

< Test Example  2>

Since the concrete hump tube according to the embodiment of the present invention can be formed from high strength concrete, the thickness of the concrete hump pipe according to the embodiment of the present invention can be thinned, while the concrete hump pipe according to the comparative example is low strength concrete. There was no.

Table 2 shows the specimens prepared according to the embodiment of the present invention and having a hume tube thickness of 10 cm and the specimens prepared according to the comparative example and having a hume tube thickness of 12 cm, I compared them.

 Item   Example   Comparative Example  Specimen thickness   10 cm   12 cm  Curing temperature   60 ° C   80 ℃  Curing time   3 hours   4 hours Compressive strength SC (steam curing)
AC (autoclave curing) 50
90 44
78  Modulus of elasticity 6.10 x 10 ⁴ 4.10 x 10 ⁴  PH of Concrete   12   12  Crack resistance index   130%   100%

As described above, since the hume pipe manufactured according to the embodiment of the present invention is a high strength concrete, it can be confirmed that the compressive strength, the elastic modulus and the crack resistance index are further improved compared with the existing low strength concrete even when the thickness of the concrete is thinly formed.

< Test Example  3>

For the test of dynamic elastic modulus of the specimens prepared from the examples and comparative examples, tests were carried out in accordance with KS F 2560 test method for concrete admixtures for concrete, and the specimens prepared from the examples and comparative examples were tested at + 4 ° C to -18 ° C 200 cycles, and the relative dynamic modulus of elasticity was measured every 30 cycles. The results are summarized in Table 3 and are shown graphically as in FIG.

30 cycles 60 cycles 90 cycles 120 cycles 150 cycles 180 cycles 200 cycles Example 99.8% 99.5% 99.5% 99.3% 98.8% 97.8% 96.5% Comparative Example 99.9% 96.5% 85.6% 78.2% 30.3% 0% 0%

As a result of the above-mentioned freezing and thawing test, it was confirmed that even in 200 cycles of the durability performance, the relative dynamic carbon content was 96.5%, indicating excellent resistance to freezing and thawing. On the other hand, in the case of the comparative example, the relative dynamic elastic modulus was 78.2% in the 120th cycle, and it was confirmed that the relative dynamic modulus satisfying the criteria of the relative dynamic modulus of 80% or more was not satisfied.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. And can be modified and changed.

Claims (9)

The present invention relates to a binder and a binder, which comprises 150 to 400 parts by weight of an aggregate, 0.5 to 2.5 parts by weight of a crude steel fluidizing agent as a polycarboxylate ether, 0.1 to 0.5 parts by weight of a low viscosity material separation preventing agent, VAE (Vinyl Acetate Ethylene: 1 to 5 parts by weight of a resin for at least one elastic concrete among resins of ethylene-vinyl acetate (EVA), ethylene-vinyl acetate (EVA), styrene butadiene rubber (SBR), and water- And 0.1 to 0.5 parts by weight of a water permeation inhibitor, wherein the aggregate is capable of being formed in a non-centrifugal and non-vibration mode containing water in an amount of 19 to 45 parts by weight based on 100 parts by weight of the binder, wherein the aggregate is a coarse aggregate having a diameter of from 13 mm to 40 mm And sand, and can be molded in a non-centrifugal and non-vibration mode with a weight of 30 to 90 parts by weight based on 100 parts by weight of an aggregate having a large amount of sand. The method according to claim 1,
Wherein the binder comprises at least one of Portland cement, granulated blast furnace slag, fly ash, and silica fume. 3. The method of claim 2,
Characterized in that the binder comprises 40 to 80% by weight of Portland cement, 3 to 20% by weight of blast furnace slag fine powder, 3 to 20% by weight of fly ash, and 3 to 20% by weight of silica fume A composition for forming a hume tube, which can be molded. The method according to claim 1,
Wherein at least one of a cellulose-based thickener, a starch-based thickener or fiber, and an acryl-based thickener is applied to the material separation preventing agent. A composition for the manufacture of Hume tub. delete The method according to claim 1,
Wherein the permeability inhibitor is at least one selected from the group consisting of a stearate series, a silane series, and a siloxane series, which are metal salts, is applied to a non-centrifugal and non- &Lt; / RTI &gt; delete Providing a composition for the production of hume tubes of claim 1;
Introducing the composition for making a hume pipe into a mold for molding a cylindrical hume tube, and raising the temperature to 60 占 폚 at a rate of 20 占 폚 / hr;
The composition for preparing a hume tube housed in the mold is cured at 60 ° C for 3 hours; And
And separating the hume pipe from the mold to obtain a concrete hume pipe. The method of manufacturing a hume pipe according to claim 1, A Hume tube formed from the composition for making a hume tube of claim 1.

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