KR101625970B1 - Concrete admixture and a method of manufacturing the steam curing concrete - Google Patents
Concrete admixture and a method of manufacturing the steam curing concrete Download PDFInfo
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- KR101625970B1 KR101625970B1 KR1020150140310A KR20150140310A KR101625970B1 KR 101625970 B1 KR101625970 B1 KR 101625970B1 KR 1020150140310 A KR1020150140310 A KR 1020150140310A KR 20150140310 A KR20150140310 A KR 20150140310A KR 101625970 B1 KR101625970 B1 KR 101625970B1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/106—Kaolin
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/0013—Boron compounds
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
Abstract
Description
The present invention relates to a concrete admixture of a steam curing concrete structure and a method of manufacturing the same, and more particularly, to a steam curing concrete structure capable of enhancing the strength of a steam curing concrete structure and shortening an initial setting time through a pozzolanic reaction with calcium hydroxide And a method for producing the same.
Generally, curing method of concrete structure can be divided into natural curing method and steam curing method. The natural curing method is to literally cure in a natural state without any special treatment. The steam (steam) curing method is a method of promoting the early strength of the concrete, usually through four curing steps.
The temperature is raised up to about 65 ° C in an atmosphere having a humidity of 100% in the temperature rising step, the above temperature is maintained for a predetermined time (usually 6 hours) in the maximum temperature holding step, The temperature is lowered to about 20 ° C.
So far, most of the concrete admixtures used to manufacture concrete structures are mainly admixtures which are applied to natural curing methods. However, there is a huge difference between the natural curing method and the steam curing method, and it is very difficult to use the concrete admixture used in the natural curing method equally in the steam curing method.
Manufacturers using natural curing methods are relatively larger than manufacturers using steam curing methods and there is also a problem that it is very difficult for manufacturers using a relatively small amount of steam curing method to select an appropriate concrete admixture.
In the registered patent 10-1143435 (registered on April 30, 2012, the admixture for strength improvement, the concrete composition using the same and the cement mortar composition), an admixture for strength enhancement which can be applied including a natural curing method and a steam curing method However, there is a problem that the provided admixture is provided in the form of a solid powder, so that it is not easily mixed into concrete and it is difficult to have a homogeneous mixing state.
Therefore, there is a problem that it is not easy to apply to the steam curing method. In the market, development of a concrete admixture suitable for the steam curing method is required.
The object of the present invention is to provide a concrete admixture of a steam curing concrete structure which can be used exclusively for the steam curing method and a method of manufacturing the same.
In order to achieve the above object, the concrete admixture of the present invention comprises 15 to 18 parts by weight of the following first composition, 30 to 33 parts by weight of the second composition below, 30 to 35 parts by weight of the third composition.
Wherein the first composition comprises 2 to 3 parts by weight of meta kaolin having a powder degree of 9,000 to 10,000 cm < 2 > / g, 5 to 6 parts by weight of alumina cement having a powder degree of 4,000 to 5,000 cm & 0.001 to 0.002 parts by weight of a catalyst, 15 to 20 parts by weight of sodium hydroxide, and 2 to 3 parts by weight of borax,
The second composition may be a mixture of 20 to 22 parts by weight of liquid sodium silicate and 30 to 33 parts by weight of a polycarboxylate water reducing agent based on 100 parts by weight of water,
The third composition may be a mixture of 50 to 55 parts by weight of an anionic surfactant with respect to 100 parts by weight of water.
The method of manufacturing a concrete admixture of a steam cured concrete structure according to the present invention comprises the steps of: a) preparing a first composition by adding water, meta kaolin, alumina cement, a catalyst, sodium hydroxide and borax; b) C) mixing 50 to 55 parts by weight of an anionic surfactant with 100 parts by weight of water to prepare a third composition; and d) And mixing the prepared first composition with the second composition prepared in step b) and the third composition prepared in step c) to prepare a concrete admixture.
Wherein the step a) comprises: a) mixing 2 to 3 parts by weight of meta kaolin having a powder degree of 9,000 to 10,000 cm < 2 > / g with respect to 100 parts by weight of water at 10 to 20 DEG C in a first reaction tank; 5 to 6 parts by weight of an alumina cement having a weight-average particle size of 10 to 100 m < 2 > / g and 0.001 to 0.002 parts by weight of a catalyst; and a-2) 15 to 20 parts by weight of sodium hydroxide A-3) adding 2 to 3 parts by weight of borax in a state where the temperature of the first reactor is raised to 100 to 110 ° C, and then reacting the mixture for 1 hour to 2 hours; and a-4) And a natural reaction at room temperature for 12 hours to 13 hours, followed by filtering to prepare the first composition.
In step b), 20 to 22 parts by weight of liquid sodium silicate and 30 to 33 parts by weight of a polycarboxylate-based water reducing agent are mixed with 100 parts by weight of water at 30 to 35 ° C in the secondary reaction tank and stirred for 30 minutes to 50 minutes. To prepare a second composition.
In the step c), the third composition may be prepared by mixing 50 to 55 parts by weight of an anionic surfactant with respect to 100 parts by weight of water at 20 to 22 ° C in the third reaction tank.
The step d) comprises adding 15 to 18 parts by weight of the first composition, 30 to 33 parts by weight of the second composition and 40 to 50 parts by weight of the third composition to 100 parts by weight of water at 20 to 22 캜 Min to complete the concrete admixture of the steam cured concrete structure.
The present invention can improve the compressive strength and flexural strength of the steam curing concrete structure by using calcium hydroxide and pozzolanic reaction of the cement in hydration reaction of the cement, improve the productivity by shortening the initial coagulation time, and improve the durability of the concrete structure There is an effect.
FIG. 1 is a flowchart illustrating a process of manufacturing a concrete admixture of a steam curing concrete structure according to a preferred embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a concrete admixture of a steam curing concrete structure according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a flowchart illustrating a process of manufacturing a concrete admixture of a steam curing concrete structure according to a preferred embodiment of the present invention.
1, a method for manufacturing a concrete admixture of a steam cured concrete structure according to a preferred embodiment of the present invention comprises the steps of preparing a first composition by adding water, meta kaolin, alumina cement, a catalyst, sodium hydroxide and borax, (S20) of mixing a water, a liquid sodium silicate and a polycarboxylic acid-based water reducing agent to prepare a second composition (S20), and mixing the water and an anionic surfactant to prepare a third composition S30), and a fourth step (S40) of mixing the first composition, the second composition and the third composition to prepare a concrete admixture.
In the first step (S10), 2 to 3 parts by weight of meta-kaolin having a powder degree of 9,000 to 10,000 cm < 2 > / g is added to 100 parts by weight of water at 10 to 20 DEG C in the primary reaction tank, 5 to 6 parts by weight of alumina cement and 0.001 to 0.002 parts by weight of a catalyst are added to the first reaction tank, and 15 to 20 parts by weight of sodium hydroxide is added while the temperature of the first reaction tank is raised to 40 to 45 캜 (S12), adding 2 to 3 parts by weight of borax in a state of raising the temperature of the first reaction tank to 100 to 110 占 폚, and then reacting for 1 hour to 2 hours (S13) For 12 hours to 13 hours, and then filtering to produce a first composition (S14).
In the second step S20, 20 to 22 parts by weight of liquid sodium silicate and 30 to 33 parts by weight of a polycarboxylate-based water reducing agent are mixed with 100 parts by weight of water at 30 to 35 DEG C in the secondary reaction tank, And the mixture is stirred for 50 minutes to prepare a second composition.
In the third step S30, the third composition is prepared by mixing 50 to 55 parts by weight of an anionic surfactant with 100 parts by weight of water at 20 to 22 캜.
In the fourth step (S40), 15 to 18 parts by weight of the first composition, 30 to 33 parts by weight of the second composition, and 30 to 35 parts by weight of the third composition are mixed in 100 parts by weight of water at 20 to 22 캜, Mix for 50 minutes to complete the concrete admixture of the steam curing concrete structure.
In the process of manufacturing the concrete admixture of the present invention, the limitation of the weight, the temperature and the reaction time is an optimum condition in which precipitation does not occur. Also, the hydration reaction is smoothly performed and the steam curing This is a condition that can prevent the durability and strength of the concrete structure from being weakened.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, concrete embodiments of the present invention will be described in detail with reference to the results of measurement of physical properties of steam cured concrete structures manufactured by the embodiments.
≪ Example 1 >
20 kg of the concrete admixture composition of the steam cured concrete structure of the present invention in which the first composition, the second composition and the third composition were mixed was mixed with 50 kg of water. Then, as shown in Table 1 below, 1% .
The comparative example is a concrete structure to which the concrete admixture composition of the steam curing concrete structure of the present invention is not added.
In order to measure the compressive strength based on the slump test of KSF-2402, the specimen test of KSF-2403 and the compressive strength test of KSF-2405 on the 7th, 14th and 28th days, * Three 20 cm specimens were prepared and stored at room temperature, demolded after 24 hours, cured at a temperature of 19 to 21 ° C by wet curing method, and water content, slump and compressive strength were measured at each age.
At this time, the water-reducing rate indicating the measured physical properties (workability) of Example 1 was increased by 23.08% and the slump (steam) was increased by 12.5%.
Also, as shown in Table 2 below, it can be confirmed that the compressive strength is increased from 15.79% to 23.28% by the average age.
≪ Example 2 >
20 kg of the concrete admixture composition of the steam cured concrete structure of the present invention in which the first composition, the second composition and the third composition were mixed was mixed with 50 kg of water, and then, as shown in Table 3 below, 1.5% .
(13mm-25mm)
(Cement * 1.5%)
Example 2 of the formulation as shown in Table 3 and comparative example without addition of the present invention were tested with a concrete mixer according to the test method of KSF-4004 on the basis of 7 days, 14 days, and 28 days at 10? * 20 cm Three specimens were prepared and the specimens were cured in a steam curing room (temperature: 30 ° C-80 ° C / humidity: 80-100) for 5 hours, demolded after 24 hours and stored at room temperature. Respectively.
The blend shown in Table 3 in Example 2 is a step in which the slump is not measured as a dry process.
As shown in Table 4, the compressive strength of the concrete admixture of the steam cured concrete structure is increased from 30.02% to 33.76% for each age.
It can also be seen that the compressive strength increase rate is higher in Example 2 than the wet curing method of Example 1, which is the steam curing method, as compared to the respective comparisons.
As described above, the concrete admixture of the steam curing concrete structure of the present invention promotes the hydration reaction of the cement and promotes the calcium hydroxide and pozzolanic reaction of the cement to strengthen the strength (compressive strength and bending strength) of the concrete structure, Slump improvement), it is possible to reduce the manufacturing cost of the structure by reducing the steam process time, and it is possible to smoothly manage the quality standard of the structure, thereby preventing the increase in the cost due to the poor quality There is also an effect.
In addition, by using metakaolin powder having a powder degree of 9,000 to 10,000 cm 2 / g and alumina cement having a powder degree of 4,000 to 5,000 cm 2 / g, residual wastes are not generated, thereby preventing environmental pollution
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And this also belongs to the present invention.
Claims (6)
Wherein the first composition comprises 2 to 3 parts by weight of meta kaolin having a powder degree of 9,000 to 10,000 cm < 2 > / g, 5 to 6 parts by weight of alumina cement having a powder degree of 4,000 to 5,000 cm & 0.001 to 0.002 parts by weight of a catalyst, 15 to 20 parts by weight of sodium hydroxide, and 2 to 3 parts by weight of borax,
The second composition is a mixture of 20 to 22 parts by weight of liquid sodium silicate and 30 to 33 parts by weight of a polycarboxylate-based water reducing agent based on 100 parts by weight of water,
The third composition is a mixture of 50 to 55 parts by weight of an anionic surfactant with respect to 100 parts by weight of water
b) mixing liquid sodium silicate and a polycarboxylic acid-based water reducing agent to prepare a second composition,
c) mixing water and an anionic surfactant to prepare a third composition,
d) mixing the first composition, the second composition and the third composition to prepare a concrete admixture.
The step a)
a-1) In the first reaction tank, 2 to 3 parts by weight of meta-kaolin having a powder degree of 9,000 to 10,000 cm < 2 > / g and an alumina cement having a powder degree of 4,000 to 5,000 cm & 5 to 6 parts by weight and 0.001 to 0.002 parts by weight of a catalyst,
a-2) adding 15 to 20 parts by weight of sodium hydroxide while the temperature of the first reaction tank is raised to 40 to 45 DEG C,
a-3) adding 2 to 3 parts by weight of borax at a temperature of 100 to 110 DEG C in the first reaction vessel, and then reacting the mixture for 1 hour to 2 hours;
a-4) a natural reaction at room temperature for 12 hours to 13 hours, followed by filtering to produce a first composition.
The step b)
20 to 22 parts by weight of liquid sodium silicate and 30 to 33 parts by weight of a polycarboxylate type water reducing agent are mixed with 100 parts by weight of water at 30 to 35 DEG C in the secondary reaction tank and stirred for 30 minutes to 50 minutes to prepare a second composition Wherein the steam curing concrete structure comprises a mixture of water and steam.
The step c)
Wherein the third composition is prepared by mixing 50 to 55 parts by weight of an anionic surfactant with 100 parts by weight of water at 20 to 22 占 폚 to prepare the third composition.
The step d)
15 to 18 parts by weight of the first composition, 30 to 33 parts by weight of the second composition and 30 to 35 parts by weight of the third composition are mixed for 40 to 50 minutes in 100 parts by weight of water at 20 to 22 占 폚 to prepare a concrete admixture Wherein the steam curing concrete structure comprises a mixture of water and steam.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110845173A (en) * | 2018-08-21 | 2020-02-28 | 江苏省建工建材质量检测中心有限公司 | Method for accelerating static maintenance of concrete product |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100880908B1 (en) | 2008-11-27 | 2009-02-04 | 임원순 | Cement concrete composite and pavement method for concrete bridge using the same |
| JP2009029646A (en) | 2007-07-25 | 2009-02-12 | Denki Kagaku Kogyo Kk | Hardened cement concrete, its manufacturing method, and cement concrete for use in its manufacture |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009029646A (en) | 2007-07-25 | 2009-02-12 | Denki Kagaku Kogyo Kk | Hardened cement concrete, its manufacturing method, and cement concrete for use in its manufacture |
| KR100880908B1 (en) | 2008-11-27 | 2009-02-04 | 임원순 | Cement concrete composite and pavement method for concrete bridge using the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110845173A (en) * | 2018-08-21 | 2020-02-28 | 江苏省建工建材质量检测中心有限公司 | Method for accelerating static maintenance of concrete product |
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