KR101619320B1 - Cement product manufacture method using co_2 curing - Google Patents
Cement product manufacture method using co_2 curing Download PDFInfo
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- KR101619320B1 KR101619320B1 KR1020150138566A KR20150138566A KR101619320B1 KR 101619320 B1 KR101619320 B1 KR 101619320B1 KR 1020150138566 A KR1020150138566 A KR 1020150138566A KR 20150138566 A KR20150138566 A KR 20150138566A KR 101619320 B1 KR101619320 B1 KR 101619320B1
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- 239000004568 cement Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title abstract description 21
- 238000011084 recovery Methods 0.000 claims abstract description 37
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910001868 water Inorganic materials 0.000 claims abstract description 19
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 17
- 238000003466 welding Methods 0.000 claims abstract description 16
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 239000012615 aggregate Substances 0.000 abstract description 2
- 238000001723 curing Methods 0.000 description 140
- 239000007789 gas Substances 0.000 description 30
- 238000012360 testing method Methods 0.000 description 23
- 238000006243 chemical reaction Methods 0.000 description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000010793 Steam injection (oil industry) Methods 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000012812 general test Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
- G01N33/0067—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display by measuring the rate of variation of the concentration
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
- G01N2021/354—Hygrometry of gases
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02809—Concentration of a compound, e.g. measured by a surface mass change
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Food Science & Technology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Medicinal Chemistry (AREA)
- Ceramic Engineering (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention concrete secondary after curing using a carbon dioxide (CO 2) after molding of the mixed product the cement by preparing the product through the curing speed of the curing time, applies the CO 2 welding capable of reducing the carbon footprint The present invention relates to a method for manufacturing a secondary product of concrete, comprising the steps of mixing a cement mixture with cement, aggregate and water to form a cement mixture; A molding step in which the cement mixture is injected into a mold and molded; A pre-curing step of allowing the concrete secondary product formed in the forming step to stand in air for a predetermined time and curing in air; A charging step of charging the concrete secondary product into the curing chamber after removing the forming mold; A CO 2 curing step of closing the curing chamber and then injecting CO 2 gas into the curing chamber to hold the curing gas for a predetermined time; CO 2 recovery method comprising: after CO 2 welding ends recovering CO 2 gas in the curing chamber to withdraw from the curing chamber; And a final curing step of performing the final curing of the concrete secondary product.
Description
The present invention is a product through the curing and then cured using, and more particularly, to cement and / or after the admixture formed of a mixture of products of carbon dioxide (CO 2) as an apparatus and a method for producing a concrete secondary product The present invention relates to an apparatus and a method for manufacturing a concrete secondary product using CO 2 curing which can shorten the curing time and reduce the amount of generated carbon.
Cement is produced by mixing limestone raw materials, clay and iron raw materials as raw materials and calcining at high temperature. Among these, limestone (CaCO 3 ) decomposes to CaO and CO 2 through decarbonation process at high temperature of 800 ° C or higher, CaO is used as the main material of cement, and CO 2 is discharged. Cement produces 1 tonne and is a major source of CO 2 emissions of 0.9 tonnes of CO 2. Efforts are being made worldwide to reduce the CO 2 emissions of cement in order to reduce global greenhouse gases.
In particular, cement has the characteristic of re-bonding to CO 2 and converting it to CaCO 3 , which is called carbonation.
The carbonation reaction of cement is different from the unconfined case and the hardened case. The carbonation reaction of the cement paste in the uncured state is advantageous in accelerating the coagulation time and exhibiting rapid strength.
The cement carbonation reaction in the solid state is a well-known carbonation reaction undergoing a lot of research. The calcium hydroxide reacts with CO 2 to generate calcium carbonate and water, and also reacts with calcium silicate hydrate to produce silica, calcium carbonate and water The calcium carbonate produced is believed to have the effect of filling the pores to reduce the water absorption and to improve the strength in the long term.
The existing prior arts have developed the CO 2 storage technology based on the carbonation reaction mechanism after hardening, and showed the advantage of reducing the compressive strength and pH of the product. However, after curing for curing hydration reaction of cement, 2 because the penetration because the permeability of the CO 2 poor sikimyeo the carbonation reaction in the high-pressure CO 2 in the chamber, there is a problem in that the carbonation is not easily made to the inner center.
The applicant of the present invention has developed a technique of supplying CO 2 to a cementitious product in a non-solid state, curing the product, penetrating CO 2 deeply into the interior of the cementitious system, thereby causing carbonation reaction and improving initial strength as compared with air curing (Journal of the Architectural Institute of Korea, Vol. 30, No. 5, Vol. 307, May 2014).
However, this is a conventional cement manufacturing techniques with CO 2 gas, the remaining CO 2 is used discharged to the outside there is a limit to the CO 2 reduction, since injection of both coarse since CO 2 gas to steam curing process of the CO 2 It does not have the initial strength enhancement effect and consumes energy in the steam curing process, so it produces CO 2 .
The interior of a concrete secondary product by the present invention has been to solve the problem as described above, one object of the present invention to perform the CO 2 cured for a predetermined time in a state in which the concrete secondary products unconsolidated and then, carrying out the curing for a predetermined time , It is possible to secure the initial and long-term compressive strength over the existing curing products, to shorten the time required for the entire curing, and to provide a device and a method for manufacturing a concrete secondary product which does not require a CO 2 chamber that can withstand high pressure .
Another object of the present invention is to provide an apparatus and a method for manufacturing a concrete secondary product capable of minimizing the amount of CO 2 generated by performing CO 2 curing and then recovering and reusing the remaining CO 2 gas.
In order to accomplish the above object, according to the present invention, there is provided an apparatus for manufacturing a concrete secondary product, comprising: a curing chamber having a closed space for accommodating a concrete secondary product in an uncured state; A CO 2 supply unit for supplying carbon dioxide (CO 2 ) into the curing chamber; It characterized in that the recovery of the CO 2 fed into the welding chamber, comprising a CO 2 recovery unit for supplying recovered CO 2 to the curing chamber.
A method for manufacturing a concrete secondary product using the concrete secondary product manufacturing apparatus of the present invention as described above,
Mixing of cement and aggregate with water to form a cement mixture;
A molding step in which the cement mixture is injected into a mold and molded;
A pre-curing step of allowing the concrete secondary product formed in the forming step to stand in air for a predetermined time and curing in air;
A charging step of charging the concrete secondary product into the curing chamber after removing the forming mold;
A CO 2 curing step of closing the curing chamber and then injecting CO 2 gas into the curing chamber to hold the curing gas for a predetermined time;
CO 2 recovery method comprising: after CO 2 welding ends recovering CO 2 gas in the curing chamber to withdraw from the curing chamber;
A curing step of performing the curing of the concrete secondary product;
And a control unit.
According to the present invention, CO 2 curing can be stored in a concrete secondary product by carbonation by applying CO 2 , which is a typical greenhouse gas, to a concrete secondary product in an uncured state.
In addition, CaCO 3 produced by CO 2 curing improves the initial strength by filling the internal void and increasing the density, and can maintain the strength of the existing product over the long term. In addition, since the curing is performed after CO 2 curing, the time required for curing can be greatly shortened, thereby reducing the energy saving effect and CO 2 generation additionally.
In another aspect, the present invention CO 2 there is to perform the curing After curing, the compressive strength of concrete secondary products produced by carrying out the curing as such CO 2 welding in order also a concrete secondary products produced by existing normal air curing or steam curing It was confirmed that there was a better effect.
In addition, since CO 2 curing prevents initial strength deterioration due to the use of mixed materials such as fly ash and blast furnace slag used for cement reduction, it is possible to use mixed materials that are not used in conventional concrete secondary products, Can be further improved.
In addition, it can be used for CO 2 curing and the remaining CO 2 gas can be recovered and reused, which can greatly reduce CO 2 emissions.
FIG. 1 is a view illustrating a concrete secondary product manufacturing apparatus according to an embodiment of the present invention.
2 is a flowchart illustrating a method for manufacturing a concrete secondary product according to an embodiment of the present invention.
FIG. 3 is a graph showing the thermal masses of a conventional concrete secondary product test body and a concrete secondary product test body according to the present invention.
FIG. 4 is a table showing mass measurement values of a concrete secondary product test specimen according to a curing method using a TGA.
FIG. 5 is a table showing calculated values of CO 2 absorption rates of concrete secondary product test specimens by the curing method by TGA.
6 is a graph showing the compressive strength results of a concrete secondary product test body according to the present invention.
7 is a graph showing the compressive strength of a conventional concrete secondary product test body.
FIG. 8 is a graph comparing compressive strengths of a concrete secondary product test body of the present invention produced by incorporating an admixture material and a conventional general test body.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of an apparatus and a method for manufacturing a concrete secondary product according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a view showing a concrete secondary product manufacturing apparatus according to an embodiment of the present invention. The concrete secondary product manufacturing apparatus according to the present invention has a closed space in which a concrete secondary product P in an uncured state is accommodated A CO 2 supply unit for supplying carbon dioxide (CO 2 ) to the inside of the
Wherein the CO 2 supply unit, curing through the CO 2 storage tank 21 and, CO 2
And via the CO 2 recovery unit, CO 2 recovery tank 31, a
The carbon
The steam supply unit includes a
The
The
1 and 2, a method for manufacturing a concrete secondary product using the concrete secondary product manufacturing apparatus having the above-described structure will be described.
The method for manufacturing a concrete secondary product according to the present invention is a method for manufacturing a concrete secondary product, comprising the steps of mixing a cement mixture with water to form a cement mixture, molding the cement mixture into a forming mold, allowed to stand in the air for a secondary product a preset time to the CO 2 gas in the entire welding step, after the input step, sealing the curing chamber, the curing chamber to inject a concrete secondary product after removing the mold in the curing chamber for air curing CO 2 welding step for holding for injection to a preset time, CO 2 after the end of welding CO 2 recovery step for recovering CO 2 gas in the curing chamber to withdraw from the curing chamber, the curing for carrying out the curing of the concrete secondary products .
A more detailed explanation of each step is as follows.
First, in the material mixing step, a cement mixture is prepared by mixing cement, aggregate, and water. In this case, an admixture such as fly ash or blast furnace slag may be mixed together to produce a cement mixture.
In the molding step, the cement mixture is poured into a molding mold such as a mold, and the concrete secondary product is molded in a specific shape by vibrating or pressing.
When the concrete secondary product is molded as described above, the molded concrete secondary product is left in the air for 2 to 24 hours to perform the pre-curing step to remove the molding frame.
When the pre-curing step is completed, the concrete secondary product P is put into the
And by operating the feed compressor (22) injecting CO 2 gas into the
In the CO 2 curing step, CO 2 is supplied to the unreinforced concrete secondary product (P) to cause a carbonation reaction, thereby filling the internal void and improving the initial strength by increasing the density. The carbonation reaction of concrete secondary product (P) in an uncured state accelerates the setting time and accelerates the strength development. The major unreacted cement phases that are carbonated are C 3 S and C 2 S. The calcium silicate phase reacts with CO 2 in the presence of moisture to produce calcium silicate hydrate (C x SH y ) and produces chemically safe calcium carbonate instead of calcium hydroxide. This reaction is expressed by the following equations (1) and (2).
C 3 S + (3-x) CO 2 + y H 2 O → C x SH y + (3-x) CaCO 3 (1)
C 2 S + (2-x) CO 2 + y H 2 O → C x SH y + (2-x) CaCO 3 (2)
When the above-mentioned CO 2 curing is finished, the CO 2 recovery unit is operated to withdraw the CO 2 gas in the curing
Thus, by using a
When the recovery of the CO 2 gas in the curing
When the curing is difficult to hydrate, it is necessary to spray or water tank impregnation before the curing step for the strength development by the hydration reaction of the concrete secondary product (P) dried by the carbonation in the CO 2 curing step It is preferable to further perform a water supply step of supplying water to the concrete secondary product (P).
When the present curing is to be steam curing, steam is supplied into the curing
According to the concrete secondary product manufacturing method of the present invention as described above, the CO 2 curing can be stored in the concrete secondary product by the carbonation reaction by applying CO 2 , which is a typical greenhouse gas, to the concrete secondary product in an uncured state.
In addition, CaCO 3 produced by CO 2 curing improves the initial strength by filling the internal void and increasing the density, and can maintain the strength of the existing product over the long term. In addition, the time required for steam curing applied to enhance the strength of existing cement products is shortened to about 50%, thereby further reducing the energy saving effect and the CO 2 generation amount.
In addition, since CO 2 curing prevents initial strength deterioration due to the use of mixed materials such as fly ash and blast furnace slag used for cement reduction, it is possible to use mixed materials that are not used in conventional concrete secondary products, Can be further improved.
In addition, it can be used for CO 2 curing and the remaining CO 2 gas can be recovered and reused, which can greatly reduce CO 2 emissions.
In order to evaluate the performance of the concrete secondary product manufactured by the method according to the present invention, the CO 2 absorption rate measurement and the compressive strength measurement test using TGA were performed. The secondary concrete test specimens used were those made by mixing 300 kg / m3 of cement, 105 kg / m3 of water and 2,020 kg / m3 of sand. In order to compare the compressive strength characteristics of concrete secondary products, cubic type specimens of 50 × 50 × 50 mm were prepared according to KS L 5105 "Compressive Strength Test of Hydraulic Cement Mortar" After curing in a laboratory room for a period of time, curing was started. The pre-curing, CO 2 curing and air curing of the specimens were carried out under laboratory air-conditioning conditions (21 ° C, RH 30%), not separate temperature and humidity conditions.
After the pre-curing, the demolded specimens were cured with CO 2 , and curing conditions were classified as basic, high pressure and low concentration. CO 2 was the primary curing for 2 hours at 100% concentration, and pressure conditions in the common chamber (test samples Ca100-2h-AH, Ca100-2h-W, Ca100-2h-S), the high-pressure CO 2 concentration is cured in a high-
FIG. 3A and FIG. 3B are thermogravimetric analyzes of the specimens not subjected to CO 2 curing and the specimens cured for 2 hours at 100% CO 2 after 7 days in a curing box under aerobic conditions. It is shown that the temperature of the CO 2 curing test piece is larger than that of the CO 2 curing test piece, although it is possible to confirm both the general air curing test specimen and the CO 2 curing test specimen because the calcium carbonate part is decomposed into CO 2 by heat.
Figure 4 provides a summary of the CO 2 absorption rate of the normal air curing test specimen for the CO 2 absorption rate of the test sample and the comparative CO 2 in accordance with various conditions and the main curing method using thermal weight value by the TGA.
CO 2 welding, and the main curing method by the CO 2 absorption rate is also estimated using Table 4 is summarized in the table of FIG. Compared broken down by CO 2 welding condition Ca100-2h average test samples were 13.14%, Ca25-4h test samples to 9.89~17.61% is 8.38%, HCa100-1h test body is the higher the pressure and concentration of 19.26% higher the CO 2 absorption rate The trend was confirmed.
6 shows the compressive strength of the CO 2 curing test specimen.
7 is without the CO 2 welding air, water, steam curing illustrates the compression strength of a
In addition, the compressive strength of CO 2 cured and steam cured and CO 2 cured steam cured specimens with 10% replacement of fly ash and blast furnace slag were additionally tested. As a result, The problem of strength reduction was not occurred but rather rather high. Therefore, the specimens without CO 2 curing were subjected to 8-hour steam curing. Therefore, it can be confirmed that the CO 2 curing time is 2 hours and the steam curing time is 4 hours.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.
P: concrete secondary product 10: curing chamber
21: CO 2 storage tank 22: supply compressor
23: supply flow path 24: concentration control valve
31: CO 2 recovery tank 32: recovery compressor
33: carbon dioxide separation membrane 34: recovery valve
35: Recovery flow path 41: Boiler
42: steam jet nozzle 43:
44: Steam control valve 51: Concentration sensing unit
52: Temperature sensing unit 53: Humidity sensing unit
Claims (10)
Mixing of cement and aggregate with water to form a cement mixture;
A molding step in which the cement mixture is injected into a mold and molded;
A pre-curing step of allowing the concrete secondary product formed in the forming step to stand in air for a predetermined time and curing in air;
A charging step of charging the concrete secondary product into the curing chamber after removing the forming mold;
A CO 2 curing step of closing the curing chamber and then injecting CO 2 gas into the curing chamber to hold the curing gas for a predetermined time;
CO 2 recovery method comprising: after CO 2 welding ends recovering CO 2 gas in the curing chamber to withdraw from the curing chamber;
A curing step of performing the curing of the concrete secondary product;
Wherein the method comprises the steps of:
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210124852A (en) * | 2020-04-07 | 2021-10-15 | 한국과학기술원 | Curing method of cement comprising alkali activated slag |
| KR20220097663A (en) * | 2020-12-30 | 2022-07-08 | 한국석회석신소재연구재단 | Manufacturing Method of Calcium Silicated Base Cement Clinker And Calcium Silicated Base Cement Clinker Hardening Body |
| KR20230112447A (en) | 2022-01-20 | 2023-07-27 | 한국과학기술원 | Segment formwork system for carbonation curing of concrete structure and carbonation curing method using the same |
| KR102632095B1 (en) | 2022-12-09 | 2024-02-02 | 한국건설기술연구원 | Method for manufacturing carbon eating concrete using carbon dioxide dissolved water of nano-bubble |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20210124852A (en) * | 2020-04-07 | 2021-10-15 | 한국과학기술원 | Curing method of cement comprising alkali activated slag |
| KR102357971B1 (en) * | 2020-04-07 | 2022-02-03 | 한국과학기술원 | Curing method of cement comprising alkali activated slag |
| KR20220097663A (en) * | 2020-12-30 | 2022-07-08 | 한국석회석신소재연구재단 | Manufacturing Method of Calcium Silicated Base Cement Clinker And Calcium Silicated Base Cement Clinker Hardening Body |
| KR102565729B1 (en) | 2020-12-30 | 2023-08-14 | 한국석회석신소재연구재단 | Manufacturing Method of Calcium Silicated Base Cement Clinker And Calcium Silicated Base Cement Clinker Hardening Body |
| KR20230112447A (en) | 2022-01-20 | 2023-07-27 | 한국과학기술원 | Segment formwork system for carbonation curing of concrete structure and carbonation curing method using the same |
| KR102632095B1 (en) | 2022-12-09 | 2024-02-02 | 한국건설기술연구원 | Method for manufacturing carbon eating concrete using carbon dioxide dissolved water of nano-bubble |
| KR102680950B1 (en) * | 2023-12-06 | 2024-07-04 | 석성기업주식회사 | Concrete structure with reduced carborn emission and manufacturing method therof |
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