Carbonation curing system for hydraulic hardened body and carbonation curing control method for hydraulic hardened body

Abstract

To provide a carbonation hardening system of a hydraulic hardened body and a carbonation hardening management method of the hydraulic hardened body, capable of efficiently using CO2 in a carbonation hardening tank for carbonation hardening of the hydraulic hardened body.SOLUTION: The carbonation curing system for a hydraulic hardened body includes a carbonation curing tank for accommodating a hydraulic hardened body, a supplying unit for supplying a carbon dioxide-containing gas having a higher CO2 concentration than air into the carbonation curing tank, a discharging unit for discharging a gas containing at least carbon dioxide from the inside of the carbonation curing tank to the outside of the carbonation curing tank, and a blower provided inside the carbonation curing tank to apply the gas containing CO2 to the hydraulic hardened body.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carbonation curing system for a hydraulically hardened body and a carbonation curing management method for a hydraulically hardened body. [Background technology]

[0002] In recent years, technology for fixing CO2 in concrete has been attracting a great deal of attention in order to realize a carbon-neutral society. In this technology, the CO2 concentration in the tank is increased, and carbonation curing is carried out during the hardening process of the concrete left in the tank, causing the concrete to absorb and fix CO2.

[0003] For example, Patent Document 1 describes a curing system for producing a concrete-based final product and curing a material that will not fully cure without the presence of CO2. In the curing system of Patent Document 1, the bonding element has a core containing a predetermined element, a first layer at least partially covering the core and containing the predetermined element, and a second layer at least partially covering the first layer and containing the predetermined element. Carbon dioxide gas is supplied to the curing chamber from a carbon dioxide source via a gas inlet port, and during curing, the concentration of carbon dioxide gas in the curing chamber, the temperature of the carbon dioxide gas, the humidity of the carbon dioxide gas, the amount of carbon dioxide gas supplied to the curing chamber, and the circulation of carbon dioxide gas present in the curing chamber are controlled.

[0004] However, in conventional carbonation curing systems such as those described in Patent Document 1, not all of the CO2 already present in the curing chamber before the CO2 supply and the CO2 supplied to the curing chamber are used for carbonation curing, and the CO2 not used for carbonation curing leaks from the curing chamber. As such, the CO2 in the curing chamber is not fully used for carbonation curing and is wasted and released from the curing chamber. Therefore, there is a need to increase the amount of CO2 used for carbonation curing in the curing chamber and reduce the amount of CO2 leaking from the curing chamber. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6598818 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a carbonation curing system for hydraulic hardened bodies and a carbonation curing management method for hydraulic hardened bodies, which can efficiently use CO2 in a carbonation curing tank for the carbonation curing of hydraulic hardened bodies. [Means for solving the problem]

[0007] [1] A carbonation curing system for a hydraulically hardened body, comprising: a carbonation curing tank for accommodating a hydraulically hardened body; a supply unit for supplying a carbon dioxide-containing gas having a higher CO2 concentration than air into the carbonation curing tank; a discharge unit for discharging a gas containing at least carbon dioxide from the inside of the carbonation curing tank to the outside of the carbonation curing tank; and a blower provided inside the carbonation curing tank for blowing the CO2-containing gas onto the surface of the hydraulically hardened body. [2] The carbonation curing system for hydraulic hardened bodies described in [1] above, wherein the blower continuously blows the gas containing CO2 onto the surface of the hydraulic hardened body at a flow rate of 0.05 m / s or more and 5.00 m / s or less. [3] The carbonation curing system for hydraulically hardened bodies according to [1] or [2] above, further comprising at least one occupant disposed above the hydraulically hardened body inside the carbonation curing tank to form an enclosed space. [4] The carbonation curing system for a hydraulically hardened body according to any one of the above [1] to [3], further comprising a dehumidifier provided inside the carbonation curing tank to dehumidify the gas inside the carbonation curing tank, and to supply heat generated by dehumidifying the gas inside the carbonation curing tank to the inside of the carbonation curing tank when the temperature inside the carbonation curing tank is equal to or lower than a predetermined temperature, and to discharge heat generated by dehumidifying the gas inside the carbonation curing tank to the outside of the carbonation curing tank when the temperature inside the carbonation curing tank is higher than the predetermined temperature. [5] The carbonation curing system for a hydraulically hardened body according to any one of the above [1] to [4], further comprising a heater provided inside the carbonation curing tank for heating the gas in the carbonation curing tank when the temperature in the carbonation curing tank is equal to or lower than a predetermined value. [6] The carbonation curing system for a hydraulically hardened body according to any one of the above [1] to [5], further comprising a cooling device provided inside the carbonation curing tank for cooling the gas inside the carbonation curing tank when the temperature inside the carbonation curing tank is higher than a predetermined value. [7] The carbonation curing system for a hydraulically hardened body according to any one of [1] to [6] above, further comprising an air velocity sensor provided on the surface of the hydraulically hardened body to measure the flow velocity of gas on the surface of the hydraulically hardened body. [8] The carbonation curing system for a hydraulically hardened body according to any one of [1] to [7] above, further comprising a combined sensor provided on the surface of the hydraulically hardened body to measure at least one of the temperature, humidity, CO2 concentration, and condensation on the surface of the hydraulically hardened body. [9] The carbonation curing system for a hydraulically hardened body according to any one of the above [1] to [8], which comprises a plurality of the carbonation curing tanks, which are connected to each other, and which supplies gas containing at least carbon dioxide gas discharged to the outside of one of the carbonation curing tanks into the inside of another of the carbonation curing tanks.

[10] The carbonation curing system for a hydraulically hardened body according to any one of the above [1] to [9], further comprising a carbon dioxide delayed discharge mechanism that discharges gas containing at least air and carbon dioxide from inside the carbonation curing tank to the outside of the carbonation curing tank via the discharge part, and that preferentially discharges air to the outside of the carbonation curing tank over carbon dioxide.

[11] The carbonation curing system for a hydraulically hardened body according to any one of the above [1] to

[10] , wherein the supply unit is provided at the bottom of the side wall of the carbonation curing tank.

[12] The carbonation curing system for a hydraulic hardened body according to the above item

[10] or

[11] , wherein the discharge unit is provided in the upper part of the carbonation curing tank, and the carbon dioxide delayed discharge mechanism comprises a carbon dioxide delay unit that circulates the gas from the upper part of the carbonation curing tank to the lower part of the carbonation curing tank, and supplies the gas that has circulated upward in the carbonation curing tank through a flow path cross-sectional area S2 that is smaller than the flow path cross-sectional area S1 when circulating downward, to the discharge unit.

[13] The carbonation curing system for hydraulic hardened bodies described in

[12] above, wherein the carbon dioxide delay section has an inner tube whose upper end is connected to the discharge section, extends downward, and has an open lower end, and an outer tube whose lower end is closed, extends upward, has an open upper end, and covers the outer periphery of the inner tube from the outside.

[14] A method for managing the carbonation curing of a hydraulically hardened body, comprising: a filling step of filling a carbon dioxide-containing gas having a higher CO2 concentration than air into a carbonation curing tank that accommodates a hydraulically hardened body; a curing step of carbonating and curing the hydraulically hardened body with the carbon dioxide gas filled into the carbonation curing tank in the filling step; and a discharging step of discharging a gas containing at least carbon dioxide gas from the inside of the carbonation curing tank to the outside of the carbonation curing tank after the curing step, wherein the CO2-containing gas is applied to the surface of the hydraulically hardened body to carbonate and cure the hydraulically hardened body in the curing step.

[15] The carbonation curing management method for a hydraulic hardened body according to the above

[14] , wherein in the curing step, the gas containing CO2 is continuously applied to the surface of the hydraulic hardened body at a flow rate of 0.05 m / s or more and 5.00 m / s or less to carbonation cure the hydraulic hardened body.

[16] The carbonation curing management method for a hydraulic hardened body according to the above

[14] or

[15] , which comprises a plurality of the carbonation curing tanks, which are connected to each other, and which supplies gas containing at least carbon dioxide gas discharged to the outside of one of the carbonation curing tanks into the inside of another of the carbonation curing tanks. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a carbonation curing system for hydraulic hardened bodies and a carbonation curing management method for hydraulic hardened bodies, which can efficiently use CO2 in a carbonation curing tank for the carbonation curing of hydraulic hardened bodies. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing an example of a carbonation curing system for a hydraulically hardened body according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram showing another example of the carbonation curing system for a hydraulically hardened body according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a detailed description will be given based on an embodiment.

[0011] As a result of extensive research, the inventors have discovered that by exposing a gas containing CO2 to a hydraulic hardened body placed in a carbonation curing tank, the CO2 in the carbonation curing tank can be used efficiently for carbonation curing of the hydraulic hardened body, and have completed the present invention based on this finding.

[0012] The carbonation curing system for hydraulic hardened bodies of the present invention comprises a carbonation curing tank that accommodates the hydraulic hardened body, a supply unit that supplies carbon dioxide-containing gas having a higher CO2 concentration than air into the carbonation curing tank, a discharge unit that discharges gas containing at least carbon dioxide from the inside of the carbonation curing tank to the outside of the carbonation curing tank, and a blower that is provided inside the carbonation curing tank and blows the CO2-containing gas against the surface of the hydraulic hardened body.

[0013] The carbonation curing management method of the present invention for a hydraulically hardened body includes a filling step of filling a carbon dioxide-containing gas having a higher CO2 concentration than air into a carbonation curing tank containing the hydraulically hardened body, a curing step of carbonation curing the hydraulically hardened body with the carbon dioxide gas filled into the carbonation curing tank in the filling step, and a discharging step of discharging gas containing at least carbon dioxide from the inside of the carbonation curing tank to the outside of the carbonation curing tank after the curing step. In the curing step, the CO2-containing gas is applied to the surface of the hydraulically hardened body to carbonation cure the hydraulically hardened body.

[0014] Fig. 1 is a schematic diagram showing an example of a carbonation curing system for a hydraulically hardened body according to an embodiment. As shown in Fig. 1, the carbonation curing system 1 for a hydraulically hardened body (hereinafter simply referred to as the carbonation curing system) includes a carbonation curing tank 2, a supply unit 3, a discharge unit 41, and a blower 6.

[0015] The carbonation curing tank 2 constituting the carbonation curing system 1 contains a hydraulic hardened body H that is subjected to carbonation curing to absorb and fix CO2 (hereinafter, absorption and fixation will be collectively referred to as fixation). The hydraulic hardened body H is the object to be carbonation cured. For example, the hydraulic hardened body H is placed on a support 5 such as a block timber. The carbonation curing tank 2 is, for example, a shipping container.

[0016] Hydraulic hardened materials H contain cement and harden by reacting with water, and examples thereof include concrete and mortar. When the hydraulic hardened material H undergoes carbonation curing, in which the hydraulic hardened material H reacts with carbon dioxide during the hardening process, CO2 is fixed in the hydraulic hardened material H.

[0017] The supply unit 3 supplies a carbon dioxide-containing gas from the outside of the carbonation curing tank 2 to the inside of the carbonation curing tank 2 through a supply opening 2a provided in the side wall of the carbonation curing tank 2. The carbon dioxide-containing gas is a gas containing carbon dioxide, and preferably consists of only carbon dioxide. The CO2 concentration in the carbon dioxide-containing gas is higher than the CO2 concentration in air.

[0018] The supply unit 3 is provided with a supply valve 3a and is connected to a CO2 supply device 3b. The CO2 supply device 3b supplies a carbon dioxide-containing gas to the supply unit 3. If necessary, the CO2 concentration, temperature, CO2 supply rate, etc. of the carbon dioxide-containing gas supplied from the CO2 supply device 3b to the supply unit 3 may be adjusted by an adjustment unit (not shown).

[0019] The carbon dioxide-containing gas supplied from the CO2 supply equipment 3b to the supply unit 3 is supplied from the supply unit 3 to the inside of the carbonation curing tank 2. The supply valve 3a of the supply unit 3 controls the stop and start of supply (supply restart) of the carbon dioxide-containing gas into the carbonation curing tank 2, as well as the adjustment of the supply amount of the carbon dioxide-containing gas supplied into the carbonation curing tank 2.

[0020] When filling the carbon dioxide-containing gas into the carbonation curing tank 2, in order to reduce the amount of CO2 that leaks from the carbonation curing tank 2 without being used for the carbonation curing of the hydraulic hardened body H and to efficiently use the carbon dioxide in the carbon dioxide-containing gas supplied from the supply unit 3 for the carbonation curing of the hydraulic hardened body H, the supply unit 3 is preferably provided in the lower part of the side wall of the carbonation curing tank 2, and more preferably in the lower part of the side wall of the carbonation curing tank 2 that faces the carbon dioxide delayed discharge mechanism 4 described below.

[0021] The exhaust unit 41 exhausts gas containing at least carbon dioxide gas from the inside of the carbonation curing tank 2 to the outside of the carbonation curing tank 2.

[0022] The blower 6 is provided inside the carbonation curing tank 2. The blower 6 agitates the gas inside the carbonation curing tank 2 and is different from the air conditioning equipment 8 that adjusts the temperature and humidity inside the carbonation curing tank 2. For example, the blower 6 is provided at a position opposite the supply unit 3 and blows air in a direction away from the carbon dioxide gas delayed discharge mechanism 4, which will be described later.

[0023] During carbonation curing of the hydraulic hardened body H, the air blower 6 in the carbonation curing tank 2 blows gas containing CO2 onto the surface of the hydraulic hardened body H. In this way, the CO2 in the carbonation curing tank 2 can be efficiently used for carbonation curing of the hydraulic hardened body H.

[0024] Furthermore, when the blower 6 continuously blows CO2-containing gas onto the surface of the hydraulically cured material H at a flow rate of 0.05 m / s or more, condensation is less likely to occur on the surface of the hydraulically cured material H, and the carbonation depth of the hydraulically cured material H can be easily controlled to a predetermined level. Furthermore, drying shrinkage of the hydraulically cured material H in the early stages of its life can be suppressed. Furthermore, when the flow rate is preferably 5.00 m / s or less, more preferably 1.00 m / s or less, shrinkage due to excessive drying of the hydraulically cured material H and the occurrence of fine cracks in the hydraulically cured material H can be suppressed. The flow rate of the gas blown onto the surface of the hydraulically cured material H from the blower 6 can be measured by a wind speed sensor 71 provided on the top surface of the hydraulically cured material H, as shown in FIG. 1.

[0025] Preferably, the carbonation curing system 1 further includes an air conditioning system 8. The airflow continuously blown onto the surface of the hydraulically hardened body H by the blower 6 is preferably an airflow generated by the blower 6, and an air supply duct 81 and an inlet 8a of the air conditioning system 8 installed in the carbonation curing tank 2. The airflow generated by the blower 6 and the air conditioning system 8 flows in one direction within the carbonation curing tank 2 (from left to right in FIG. 1 ) and continuously blows onto the surface of the hydraulically hardened body H.

[0026] The air intake 8a of the air conditioning equipment 8 is disposed on the side of the carbonation curing tank 2 facing the blower 6. The air intake of the air supply duct 81 is provided around the blower 6 and faces the blower 6. The hydraulically hardened body H is installed between the opposing air intake of the air supply duct 81 and the air intake 8a of the air conditioning equipment 8. In this way, the air supply duct 81 and the air intake 8a of the air conditioning equipment 8 are disposed separately.

[0027] The CO2-containing gas, the temperature and humidity of which have been adjusted by the operating air conditioning equipment 8, is released toward the blower 6 from the air supply port of the air supply duct 81 located at the top of the carbonation curing tank 2. The blower 6 blows the temperature- and humidity-adjusted gas toward the intake port 8a of the air conditioning equipment 8, which is installed beyond the hydraulically hardened body H. As the temperature- and humidity-adjusted gas flows toward the intake port 8a of the air conditioning equipment 8, it comes into contact with the hydraulically hardened body H, thereby progressing and accelerating the carbonation curing of the hydraulically hardened body H, and water vapor is generated from the hydraulically hardened body H.

[0028] After contacting the hydraulically hardened body H, the gas decreases in CO2 concentration and increases in humidity. The gas with a decreased CO2 concentration and increased humidity is drawn into the intake port 8a of the air conditioning unit 8, along with gases with a higher CO2 concentration and / or lower humidity than the gas with a decreased CO2 concentration. Furthermore, when carbon dioxide-containing gas is supplied from the supply unit 3 into the carbonation curing tank 2, air with a higher CO2 concentration than the gas with a decreased CO2 concentration and increased humidity is also drawn into the intake port 8a of the air conditioning unit 8. The air drawn in through the intake port 8a is sent to the air conditioning unit 8, which adjusts the temperature and humidity and mixes gases with different CO2 concentrations. The gas, whose temperature and humidity have been adjusted by the air conditioning unit 8 and whose CO2 concentration is maintained, is then released again from the air outlet of the air supply duct 81 toward the blower 6.

[0029] In this way, the gas, whose temperature and humidity have been adjusted and whose CO2 concentration has been maintained, is continuously and forcibly brought into contact with the surface of the hydraulically hardened material H, thereby suppressing the occurrence of airflow turbulence, stagnant gas, and local airflow loops due to the arrangement of the hydraulically hardened material H. Therefore, the CO2 in the carbonation curing tank 2 can be efficiently used to efficiently perform carbonation curing of the hydraulically hardened material H with little unevenness. Furthermore, because the air supply port of the air supply duct 81 and the inlet 8a of the air conditioning unit 8 are arranged opposite each other, water vapor generated from the hydraulically hardened material H during carbonation curing can be efficiently taken in from the inlet 8a located downstream into the air conditioning unit 8. As a result, the dehumidification efficiency in the carbonation curing tank 2 is improved.

[0030] In this way, the cycle in which the air conditioning equipment 8 adjusts the temperature, humidity and CO2 concentration, the blower 6 blows the gas whose temperature, humidity and CO2 concentration have been adjusted by the air conditioning equipment 8 to the hydraulic hardened body H, the hydraulic hardened body H is carbonation cured with the gas whose temperature, humidity and CO2 concentration have been adjusted, the blower 6 blows the gas after carbonation curing to the air conditioning equipment 8, and the air conditioning equipment 8 adjusts the temperature, humidity and CO2 concentration of the gas blown by the blower 6 can be carried out continuously and forcibly.

[0031] The carbonation curing system 1 preferably further includes a wind speed sensor 71. The wind speed sensor 71 is provided on the surface (top surface shown in FIG. 1) of the hydraulically hardened body H, and measures the flow speed of gas on the surface of the hydraulically hardened body H.

[0032] By disposing the air velocity sensor 71 on the surface of the hydraulically hardened body H, the flow velocity of the gas that is continuously blown onto the surface (upper surface) of the hydraulically hardened body H can be measured in real time, and therefore the gas flow velocity can be more accurately controlled within the above range by the blower 6, or in some cases the blower 6 and the air conditioning equipment 8. Therefore, the CO2 in the carbonation curing tank can be used more efficiently for the carbonation curing of the hydraulically hardened body H.

[0033] Preferably, the carbonation curing system 1 further includes a combined sensor 72. The combined sensor 72 is provided on the surface (top surface shown in FIG. 1) of the hydraulic hardened body H, and measures at least one of the temperature, humidity, CO2 concentration, and condensation on the surface of the hydraulic hardened body H. Preferably, the combined sensor 72 measures all of the temperature, humidity, CO2 concentration, and condensation on the surface of the hydraulic hardened body H.

[0034] By disposing the combined sensor 72 on the surface of the hydraulic hardened body H, the surface condition of the hydraulic hardened body H can be measured in real time, and the gas that is continuously blown onto the surface (top surface) of the hydraulic hardened body H can be conditioned by the air conditioning equipment 8, or in some cases by the blower 6 and the air conditioning equipment 8, thereby optimizing the carbonation curing environment of the hydraulic hardened body H. Therefore, the CO2 in the carbonation curing tank can be used more efficiently for the carbonation curing of the hydraulic hardened body H.

[0035] If the carbonation curing system 1 is provided with the wind speed sensor 71 and the combined sensor 72, the CO2 in the carbonation curing tank can be used more efficiently for carbonation curing of the hydraulic hardened body H.

[0036] Furthermore, the carbonation curing system 1 preferably further includes a dehumidifier installed inside the carbonation curing tank 2. The dehumidifier dehumidifies the gas inside the carbonation curing tank 2. Although FIG. 1 shows a configuration in which the dehumidifier is incorporated into the air conditioning equipment 8, the dehumidifier may be configured separately from the air conditioning equipment 8.

[0037] When the temperature inside the carbonation curing tank 2 is below a predetermined level, the dehumidifier inside the carbonation curing tank 2 supplies heat generated by dehumidifying the gas inside the carbonation curing tank 2 to the inside of the carbonation curing tank 2. The heat generated by dehumidification is released from the air supply duct 81 toward the blower 6, passed through the hydraulically hardened body H by the blower 6, and then flows to the intake port 8a of the air conditioning equipment 8, where it is used to increase or maintain the temperature inside the carbonation curing tank 2. In this way, the heat generated inside the carbonation curing tank 2 is used to control the temperature inside the carbonation curing tank 2 without being discharged outside the carbonation curing tank 2, thereby improving the heating efficiency inside the carbonation curing tank 2.

[0038] Furthermore, when the temperature inside the carbonation curing tank 2 is higher than a predetermined value, the dehumidifier inside the carbonation curing tank 2 discharges heat generated by dehumidifying the gas inside the carbonation curing tank 2 to the outside of the carbonation curing tank 2. The heat generated by the dehumidification is discharged to the outside of the carbonation curing tank 2 from an outdoor unit (not shown) that is connected to an air conditioning system 8 and installed outside the carbonation curing tank 2. In this way, the heat generated inside the carbonation curing tank 2 is not used to increase or maintain the temperature inside the carbonation curing tank 2, but is discharged to the outside of the carbonation curing tank 2, thereby improving the cooling efficiency inside the carbonation curing tank 2.

[0039] The temperature inside the carbonation curing tank 2 changes depending on the environment in which the carbonation curing tank 2 is installed, such as the season and weather. The temperature suitable for accelerating carbonation is generally determined to be in the range of outside air temperature (room temperature) to 55°C depending on the type of hydraulic hardened body, and this temperature range is set as the predetermined temperature. However, as described above, when the temperature inside the carbonation curing tank 2 is below the predetermined temperature, the heat is supplied to the inside of the carbonation curing tank 2, and when the temperature inside the carbonation curing tank 2 is above the predetermined temperature, the heat is discharged to the outside of the carbonation curing tank 2, thereby maintaining the inside of the carbonation curing tank 2 at the predetermined temperature and efficiently accelerating the carbonation curing of the hydraulic hardened body H.

[0040] In this way, depending on the temperature inside the carbonation curing tank 2, the heat generated by dehumidifying the gas is retained inside the carbonation curing tank 2 or is discharged outside the carbonation curing tank 2, so that the heat can be effectively used to control the temperature inside the carbonation curing tank 2.

[0041] Furthermore, the carbonation curing system 1 preferably further includes a heater installed inside the carbonation curing tank 2. While Fig. 1 shows a configuration in which the heater is incorporated into the air conditioning equipment 8, the heater may be configured separately from the air conditioning equipment 8.

[0042] When the temperature inside the carbonation curing tank 2 is below a predetermined level, the heater inside the carbonation curing tank 2 heats the gas inside the carbonation curing tank 2. The heated gas is released from the air supply duct 81 toward the blower 6, passed through the hydraulically hardened body H by the blower 6, and then flows into the intake port 8a of the air conditioning unit 8, where it is used to increase or maintain the temperature inside the carbonation curing tank 2. In this way, the inside of the carbonation curing tank 2 can be maintained at a predetermined temperature, thereby efficiently promoting carbonation curing of the hydraulically hardened body H. Furthermore, the gas heated by the heater inside the carbonation curing tank 2 is used to control the temperature inside the carbonation curing tank 2 without being discharged outside the carbonation curing tank 2, thereby avoiding heat loss.

[0043] Furthermore, the carbonation curing system 1 preferably further includes a cooling machine installed inside the carbonation curing tank 2. Although Fig. 1 shows a configuration in which the cooling machine is incorporated into the air conditioning equipment 8, the cooling machine may be configured separately from the air conditioning equipment 8.

[0044] When the temperature inside the carbonation curing tank 2 is higher than a predetermined temperature, the cooler inside the carbonation curing tank 2 cools the gas inside the carbonation curing tank 2. The cooled gas is discharged from the air supply duct 81 toward the blower 6, passed through the hydraulically hardened body H by the blower 6, and then flows into the intake port 8a of the air conditioning unit 8, where it is used to lower or maintain the temperature inside the carbonation curing tank 2. In this way, the inside of the carbonation curing tank 2 can be maintained at a predetermined temperature, thereby efficiently promoting carbonation curing of the hydraulically hardened body H. Furthermore, heat generated by the cooler inside the carbonation curing tank 2 is discharged outside the carbonation curing tank 2 from an outdoor unit (not shown), thereby improving the cooling efficiency inside the carbonation curing tank 2.

[0045] It is also preferable that the carbonation curing system 1 further includes at least one occupant 51 provided above the hydraulically hardened body H inside the carbonation curing tank 2. While FIG. 1 shows a configuration in which the carbonation curing system 1 includes one occupant 51, the carbonation curing system 1 may also include a plurality of occupants 51.

[0046] The occupant 51 is a member that forms a closed space, and occupies the excess space above the hydraulically hardened body H in the internal space of the carbonation curing tank 2 that is not related to the carbonation curing of the hydraulically hardened body H (hereinafter simply referred to as the excess space of the carbonation curing tank). The occupant 51 is provided without contacting the hydraulically hardened body H, and does not impede the carbonation curing of the hydraulically hardened body H. For example, the occupant 51 is larger than the hydraulically hardened body H.

[0047] The occupant 51 preferably has a lower carbon dioxide gas permeability than air, and more preferably does not transmit carbon dioxide gas. In addition to such permeability, the occupant 51 preferably has high insulating properties and is lightweight. These properties of the occupant 51 can be selected appropriately depending on the configuration of the carbonation curing system 1. Furthermore, when the carbonation curing system 1 includes multiple occupants 51, the multiple occupants 51 may all have the same properties and shapes, the multiple occupants 51 may all have different properties and shapes, or some of the multiple occupants 51 may have the same properties and shapes.

[0048] Suitable examples of the occupant 51 include a member with a hollow closed space such as an airbag, an air mattress, or a balloon, and a member with a solid closed space such as polystyrene foam.

[0049] By installing the occupant 51 in the excess space of the carbonation curing tank 2, it is possible to reduce the volume of the internal space of the carbonation curing tank 2. This makes it possible to reduce the amount of carbon dioxide-containing gas supplied to the carbonation curing tank 2, i.e., the amount of CO2 used, and also makes it possible to increase the CO2 concentration in the carbonation curing tank 2 to a predetermined value or higher in a short period of time. Furthermore, if the occupant 51 were in contact with the hydraulic hardened material H, the contact area between the hydraulic hardened material H and the carbon dioxide gas would decrease, inhibiting carbonation curing of the hydraulic hardened material H, so the occupant 51 is not in contact with the hydraulic hardened material H.

[0050] From the viewpoint of further enhancing the above-mentioned effects of the occupant 51, it is preferable that the occupant 51 be provided in the excess space between the hydraulic hardened material H and the upper part of the carbonation curing tank 2 inside the carbonation curing tank 2, as shown in Fig. 1. For example, an air spacer 52, which is a breathable member such as a box made of wire mesh or a reinforcing bar cage, is provided on the upper surface of the uppermost hydraulic hardened material H, and the occupant 51 is supported from below by the air spacer 52. Carbon dioxide gas in the gas flowing inside the air spacer 52 can be used for carbonation curing of the upper surface of the uppermost hydraulic hardened material H, which supports the air spacer 52 from below.

[0051] Furthermore, the carbonation curing system 1 preferably performs a filling process of supplying and filling the carbon dioxide-containing gas into the carbonation curing tank 2, a curing process of carbonation curing the hydraulic hardened body H with the carbon dioxide gas filled into the carbonation curing tank 2, and a discharging process of discharging gas containing at least carbon dioxide gas to the outside of the carbonation curing tank 2 after curing the hydraulic hardened body H. The filling process, curing process, and discharging process in the carbonation curing system 1 correspond to the filling step S10, curing step S20, and discharging step S30, respectively, in the carbonation curing management method for a hydraulic hardened body of an embodiment described below.

[0052] Preferably, the carbonation curing system 1 further includes a carbon dioxide delayed discharge mechanism 4. The carbon dioxide delayed discharge mechanism 4 discharges a gas containing at least air and carbon dioxide (hereinafter simply referred to as gas) from the inside of the carbonation curing tank 2 to the outside of the carbonation curing tank 2 via a discharge unit 41, and preferentially discharges air over carbon dioxide to the outside of the carbonation curing tank 2. The air contained in the gas discharged to the outside of the carbonation curing tank 2 refers to air that was already present inside the carbonation curing tank 2 before the carbon dioxide-containing gas was supplied from the supply unit 3, and when the carbon dioxide-containing gas supplied from the supply unit 3 contains air, the air contained in the carbon dioxide-containing gas supplied from the supply unit 3 is also included.

[0053] The carbon dioxide delayed discharge mechanism 4 utilizes the difference in weight between air and carbon dioxide gas to preferentially discharge air over carbon dioxide gas to the outside of the carbonation curing tank 2. In other words, the carbon dioxide delayed discharge mechanism 4 delays the discharge of carbon dioxide gas more than air. Furthermore, if the carbon dioxide-containing gas supplied from the supply unit 3 contains other substances in addition to carbon dioxide gas and air, the other substances are also discharged from the carbon dioxide delayed discharge mechanism 4 to the outside of the carbonation curing tank 2.

[0054] Such a carbon dioxide gas delayed discharge mechanism 4 includes a discharge part 41 and a carbon dioxide gas delay part 42.

[0055] The discharge unit 41 constituting the carbon dioxide delayed discharge mechanism 4 discharges gases including at least air and carbon dioxide from the inside of the carbonation curing tank 2 to the outside of the carbonation curing tank 2 through a discharge opening 2b provided in the side wall of the carbonation curing tank 2. The discharge unit 41 is provided in the upper part of the side wall of the carbonation curing tank 2.

[0056] An overflow valve 41a is provided in the discharge part 41. The overflow valve 41a of the carbon dioxide gas delayed discharge mechanism 4 controls the stop and start (restart) of the discharge of gas to the outside of the carbonation curing tank 2, as well as the adjustment of the amount of gas discharged to the outside of the carbonation curing tank 2.

[0057] The carbon dioxide delay unit 42 constituting the carbon dioxide delayed discharge mechanism 4 causes the gas to flow from the upper part of the carbonation curing tank 2 to the lower part thereof, and supplies the gas that has flowed upward in the carbonation curing tank 2 through a flow path cross-sectional area S2 that is smaller than the flow path cross-sectional area S1 when flowing downward, to the discharge unit 41. In the carbon dioxide delay unit 42, the flow path cross-sectional area S2 for flowing the gas from the lower part to the upper part of the carbonation curing tank 2 is smaller than the flow path cross-sectional area S1 for flowing the gas from the upper part to the lower part of the carbonation curing tank 2.

[0058] In this way, the carbon dioxide delay unit 42 utilizes the difference between the above-mentioned flow path cross-sectional area S1 and flow path cross-sectional area S2 to circulate the gas present in the upper part of the carbonation curing tank 2 downward through the flow path cross-sectional area S1, and to circulate the gas that has circulated downward through the flow path cross-sectional area S2 that is smaller than the flow path cross-sectional area S1, thereby enabling air to be supplied preferentially to the discharge unit 41 rather than carbon dioxide. In this way, the carbon dioxide delay discharge mechanism 4 can discharge air to the outside of the carbonation curing tank 2 via the discharge unit 41 preferentially rather than carbon dioxide.

[0059] The carbon dioxide gas delay section 42 having such a configuration preferably has an inner cylinder 42a and an outer cylinder 42b.

[0060] The inner cylinder 42a constituting the carbon dioxide gas delay section 42 has an upper end connected to the discharge section 41, extends downward, and is open at its lower end. The inner cylinder 42a extends up to near the inner surface of the lower end of the outer cylinder 42b.

[0061] The outer cylinder 42b that constitutes the carbon dioxide delay section 42 is closed at the bottom and extends upward, covering the outer periphery of the inner cylinder 42a from the outside. In this way, the inner cylinder 42a and the outer cylinder 42b that covers the entire periphery of the inner cylinder from the outside form a double cylinder structure.

[0062] The lower end of the inner cylinder 42a and the inner surface of the lower end of the outer cylinder 42b are not in contact with each other. For example, the lower limit of the vertical distance d between the lower end of the inner cylinder 42a and the inner surface of the lower end of the outer cylinder 42b is preferably 20 mm or more, and the upper limit is preferably 150 mm or less. If the distance d is 20 mm or more, gas can circulate smoothly even if condensation occurs between the lower ends of the inner cylinder 42a and the outer cylinder 42b. Furthermore, if the distance d is 150 mm or less, the airflow stabilization effect achieved by the length of the inner cylinder 42a and the outer cylinder 42b is satisfactory.

[0063] The lower end of the outer cylinder 42b may be connected to the bottom of the carbonation curing tank 2. When the lower end of the outer cylinder 42b is connected to the bottom of the carbonation curing tank 2, the lower end of the outer cylinder 42b may be open, and the bottom portion of the carbonation curing tank 2 connected to the lower end of the outer cylinder 42b also serves as the inner surface of the lower end of the outer cylinder 42b.

[0064] The outer cylinder 42b extends to a position lower than the upper end of the inner cylinder 42a. The upper end of the outer cylinder 42b is open.

[0065] A drain pipe 43 may be provided on the lower end side of the outer cylinder 42b to discharge a small amount of water (including condensed water) to the outside of the carbonation curing tank 2. The drain pipe 43 is provided with a drain valve 43a.

[0066] The gas flows in from the upper end of the outer cylinder 42b, flows downward through the outer cylinder 42b, then flows from the lower end of the outer cylinder 42b to the lower end of the inner cylinder 42a, flows upward through the inner cylinder 42a, and then flows into the discharge section 41 from the upper end of the inner cylinder 42a.

[0067] The cross-sectional area S2 of the flow path of the inner cylinder 42a, through which the gas flows from bottom to top, is smaller than the cross-sectional area S1 of the flow path of the outer cylinder 42b, through which the gas flows from top to bottom. With this double-cylinder structure of the inner cylinder 42a and the outer cylinder 42b, of the carbon dioxide gas and air contained in the gas in the carbonation curing tank 2, air can be supplied to the discharge part 41 preferentially over carbon dioxide gas.

[0068] From the viewpoint that the double-cylinder structure of the inner cylinder 42a and the outer cylinder 42b supplies air to the discharge section 41 with higher priority than carbon dioxide, it is preferable that the supply flow rate of the carbon dioxide-containing gas supplied from the supply section 3 to the inside of the carbonation curing tank 2 (hereinafter simply referred to as the supply flow rate of the carbon dioxide-containing gas) > the flow rate of the gas flowing upward inside the inner cylinder 42a (hereinafter simply referred to as the flow rate inside the inner cylinder 42a) > the flow rate of the gas flowing downward inside the outer cylinder 42b (hereinafter simply referred to as the flow rate inside the outer cylinder 42b), and that the flow rate inside the inner cylinder 42a is 20% or less of the supply flow rate of the carbon dioxide-containing gas, and that the flow rate inside the outer cylinder 42b is 5% or less of the supply flow rate of the carbon dioxide-containing gas. On the other hand, although the effect can be improved as the flow rate difference is increased, the size of the inner cylinder 42a and the outer cylinder 42b increases. Therefore, the flow rate difference may be appropriately selected depending on the arrangement constraints of the inner cylinder 42a and the outer cylinder 42b in the carbonation curing tank 2.

[0069] In the carbon dioxide-containing gas filling process, the gas in the carbonation curing tank 2 is not agitated, and instead the carbon dioxide-containing gas is supplied from the supply unit 3 provided below the carbonation curing tank 2, easily creating a state in which the CO2 concentration is high below the carbonation curing tank 2 and low above the carbonation curing tank 2. Then, the gas present above the carbonation curing tank 2, i.e., the gas with a low CO2 concentration, flows into the carbon dioxide delayed discharge mechanism 4, which then actively discharges air rather than carbon dioxide out of the carbonation curing tank 2.

[0070] In this way, by statically supplying (filling) the carbon dioxide-containing gas without stirring the gas in the carbonation curing tank 2, the difference in CO2 concentration between the top and bottom of the carbonation curing tank 2 is actively increased, and the resulting gas with a low CO2 concentration above the carbonation curing tank 2 flows into the carbon dioxide delayed discharge mechanism 4, which actively discharges the air to the outside of the carbonation curing tank 2. In this way, when the carbon dioxide-containing gas is filled into the carbonation curing tank 2, the amount of CO2 leaking from the carbonation curing tank 2 without being used for the carbonation curing of the hydraulic hardened body H is reduced, thereby reducing the amount of CO2 wastedly released from the carbonation curing tank 2, and the CO2 in the carbonation curing tank 2 can be used efficiently for the carbonation curing of the hydraulic hardened body H.

[0071] 1, the carbonation curing system 1 may further include an exhaust unit 91 having an exhaust valve 91a, an intake unit 93 having an intake valve 93a, and an exhaust fan 92 provided in the exhaust unit 91, which are provided in the carbonation curing tank 2. For example, in the discharge step (discharge step S30 described below), when it is desired to ventilate the carbonation curing tank 2, the exhaust valve 91a is opened and the exhaust fan 92 is operated to discharge the gas inside the carbonation curing tank 2 into the carbonation curing tank 2, and the intake valve 93a is opened to take in air outside the carbonation curing tank 2 into the carbonation curing tank 2. When connecting multiple carbonation curing tanks 21, 22 as described below, the intake valve 93a, which is a two-way valve, is replaced with a three-way intake valve 93b.

[0072] Fig. 2 is a schematic diagram showing another example of the carbonation curing system for a hydraulically hardened body according to the embodiment. Of the components shown in Fig. 1, Fig. 2 shows the carbonation curing tanks 2 (21, 22), the supply unit 3, the discharge unit 41, and the hydraulically hardened body H, while omitting other components. The carbonation curing tanks 21 and 22 have the same configuration as the carbonation curing tank 2 described above.

[0073] 2, the carbonation curing system 1 includes a plurality of carbonation curing tanks 21, 22, and an exhaust port 91 of the carbonation curing tank 21 is preferably connected to an intake port 93 of the carbonation curing tank 22, and the exhaust port 91 of the carbonation curing tank 22 is preferably connected to an intake port 93 of the carbonation curing tank 21. When the CO2 concentration of the gas discharged in the discharge process of the carbonation curing tank 21 is higher than that of air, the carbonation curing system 1 supplies the gas containing at least carbon dioxide discharged from the exhaust port 91 having an exhaust valve 91a and an exhaust fan 92 to the outside of the carbonation curing tank 21 from an intake port 93 of the carbonation curing tank 22, which is separate from the carbonation curing tank 21 that discharged the gas.

[0074] In the carbonation curing tanks 21 and 22 which are connected to each other, carbon dioxide-containing gas, which is discharged from the exhaust part 91 of the carbonation curing tank 21 and has a higher CO2 concentration than air, is charged into the separate carbonation curing tank 22 through the intake part 93 having the intake three-way valve 93b, so that the CO2 discharged from the carbonation curing tank 21 can be reused for carbonation curing of the hydraulic hardened body H contained in the separate carbonation curing tank 22. This further reduces the amount of CO2 leaking from the carbonation curing tank without being used for carbonation curing of the hydraulic hardened body.

[0075] Furthermore, when the CO2 concentration of the gas discharged in the discharge process of the carbonation curing tank 22 is higher than that of air, the carbon dioxide-containing gas discharged from the exhaust section 91 of the carbonation curing tank 22 can be filled into the carbonation curing tank 21 through the intake three-way valve 93b of the intake section 93, thereby further reducing the amount of CO2 leaking from the carbonation curing tank 2 without being used for the carbonation curing of the hydraulic hardened body.

[0076] When the carbonation curing tanks 21, 22 take in outside air, the intake three-way valve 93b is switched to the outside side. When multiple carbonation curing tanks 21, 22 are not connected, the intake three-way valve 93b is replaced by the intake valve 93a, which is a two-way valve.

[0077] Next, a carbonation curing control method for a hydraulically hardened body according to an embodiment will be described.

[0078] The method for managing carbonation curing of a hydraulically hardened body includes a filling step S10, a curing step S20, and a discharging step S30, and is a method for implementing the carbonation curing system for a hydraulically hardened body of the above embodiment.

[0079] In the filling step S10, the carbonation curing tank 2 containing the hydraulic hardened body H is filled with a carbon dioxide-containing gas having a higher CO2 concentration than air. In the curing step S20 performed after the filling step S10, the hydraulic hardened body H is carbonation cured using the carbon dioxide gas filled into the carbonation curing tank 2 in the filling step S10. In the discharging step S30 performed after the curing step S20, gas containing at least carbon dioxide is discharged from the carbonation curing tank 2 to the outside of the carbonation curing tank 2. Then, in the curing step S20, the gas containing CO2 is applied to the surface of the hydraulic hardened body H to carbonation cure the hydraulic hardened body H. In this way, the CO2 in the carbonation curing tank 2 can be efficiently used for carbonation curing of the hydraulic hardened body H.

[0080] Furthermore, in the curing step S20, if a gas containing CO2 is continuously blown onto the surface of the hydraulically hardened body H at a flow rate of 0.05 m / s or more, condensation is less likely to occur on the surface of the hydraulically hardened body H, and the carbonation depth of the hydraulically hardened body H can be easily controlled to a predetermined level. Furthermore, drying shrinkage of the hydraulically hardened body H in the early stages of its life can be suppressed. Furthermore, if the flow rate is preferably 5.00 m / s or less, more preferably 1.00 m / s or less, shrinkage due to excessive drying of the hydraulically hardened body H and the occurrence of fine cracks in the hydraulically hardened body H can be suppressed.

[0081] Furthermore, when the CO2 concentration of the gas discharged in the carbonation curing tank discharging step S30 is higher than that of air, the carbonation curing management method for hydraulic hardened body H preferably includes a plurality of carbonation curing tanks 21, 22 connected to each other, and supplies the gas containing at least carbon dioxide gas discharged to the outside of carbonation curing tank 21 into a carbonation curing tank 22 separate from the carbonation curing tank 21 that discharged the gas, as shown in Figure 2. The separate carbonation curing tank 22 has a configuration similar to that of the carbonation curing tank 21, and can perform the filling step S10, the curing step S20, and the discharging step S30.

[0082] Carbon dioxide-containing gas, which is discharged outside the carbonation curing tank 21 from an exhaust section 91 having an exhaust valve 91a and an exhaust fan 92 and has a higher CO2 concentration than air, is charged into a separate carbonation curing tank 22 from an intake section 93 having an intake three-way valve 93b, so that the CO2 discharged from the carbonation curing tank 21 can be reused for carbonation curing of the hydraulic hardened body H contained in the separate carbonation curing tank 22. This further reduces the amount of CO2 leaking from the carbonation curing tank without being used for carbonation curing of the hydraulic hardened body.

[0083] Furthermore, when the CO2 concentration of the gas discharged from the carbonation curing tank 22 is higher than that of air, the carbon dioxide-containing gas discharged from the exhaust section 91 of the carbonation curing tank 22 can be filled into the carbonation curing tank 21 through the intake three-way valve 93b of the intake section 93, thereby further reducing the amount of CO2 leaking from the carbonation curing tank 2 without being used for carbonation curing of the hydraulic hardened body.

[0084] According to the embodiment described above, by exposing the hydraulic hardened body placed in the carbonation curing tank to gas containing CO2, the CO2 in the carbonation curing tank can be used efficiently for carbonation curing of the hydraulic hardened body.

[0085] Although the embodiments have been described above, the present invention is not limited to the above embodiments, but includes all aspects encompassed by the concept and scope of the claims of the present disclosure, and can be modified in various ways within the scope of the present disclosure. [Explanation of symbols]

[0086] 1 Carbonation curing system for hydraulic hardened materials 2, 21, 22 Carbonation curing tank 2a Supply opening 2b Ejection opening 3 Supply section 3a Supply valve 3b CO2 supply equipment 4. Delayed carbon dioxide release mechanism 41 Discharge section 41a Overflow valve 42 Carbon dioxide delay section 42a Inner cylinder 42b outer cylinder 43 Drain pipe 43a Drain valve 5 Support 51 Occupant 52 Air spacer 6. Blower 71 Wind speed sensor 72 Combined Sensor 8 Air conditioning equipment 8a Air conditioning equipment intake 81 Air supply duct 91 Exhaust section 91a Exhaust valve 92 Exhaust fan 93 Intake section 93a Intake valve 93b Intake three-way valve H Hydraulic hardening body

Claims

1. a carbonation curing tank for accommodating the hydraulically hardened body; CO than air ２ A supply unit that supplies a highly concentrated carbon dioxide-containing gas into the carbonation curing tank; a discharge unit that discharges gas containing at least carbon dioxide gas from the inside of the carbonation curing tank to the outside of the carbonation curing tank; A CO ２ a blower that blows a gas containing A carbonation curing system for hydraulic hardened bodies, comprising:

2. The blower ２ 2. The carbonation curing system for a hydraulically hardened body according to claim 1, wherein a gas containing the above is continuously applied to the surface of the hydraulically hardened body at a flow rate of 0.05 m / s or more and 5.00 m / s or less.

3. 2. The carbonation curing system for a hydraulically cured body according to claim 1, further comprising at least one occupant provided above the hydraulically cured body inside the carbonation curing tank to form an enclosed space.

4. 2. The carbonation curing system for a hydraulically hardened body according to claim 1, further comprising a dehumidifier provided inside the carbonation curing tank to dehumidify the gas inside the carbonation curing tank, and to supply heat generated by the dehumidification of the gas inside the carbonation curing tank to the inside of the carbonation curing tank when the temperature inside the carbonation curing tank is equal to or lower than a predetermined temperature, and to discharge heat generated by the dehumidification of the gas inside the carbonation curing tank to the outside of the carbonation curing tank when the temperature inside the carbonation curing tank is higher than the predetermined temperature.

5. 2. The carbonation curing system for a hydraulically hardened body according to claim 1, further comprising a heater provided inside the carbonation curing tank for heating gas in the carbonation curing tank when the temperature in the carbonation curing tank is equal to or lower than a predetermined temperature.

6. 2. The carbonation curing system for a hydraulically hardened body according to claim 1, further comprising a cooler provided inside the carbonation curing tank for cooling the gas inside the carbonation curing tank when the temperature inside the carbonation curing tank is higher than a predetermined temperature.

7. 2. The carbonation curing system for a hydraulically cured body according to claim 1, further comprising a wind speed sensor provided on the surface of the hydraulically cured body to measure a flow speed of gas on the surface of the hydraulically cured body.

8. A temperature sensor is provided on the surface of the hydraulic hardened body, and measures the temperature, humidity, and CO ２ The carbonation curing system for a hydraulically hardened body according to claim 1, further comprising a combined sensor for measuring at least one of concentration and condensation.

9. 2. The carbonation curing system for a hydraulically hardened body according to claim 1, comprising a plurality of the carbonation curing tanks, the carbonation curing tanks being connected to each other, and a gas containing at least carbon dioxide gas discharged to the outside of one of the carbonation curing tanks being supplied to the inside of another of the carbonation curing tanks.

10. 2. The carbonation curing system for a hydraulic hardened body according to claim 1, further comprising a carbon dioxide delayed discharge mechanism that discharges gas containing at least air and carbon dioxide from inside the carbonation curing tank to the outside of the carbonation curing tank via the discharge part, and that preferentially discharges air to the outside of the carbonation curing tank over carbon dioxide.

11. 2. The carbonation curing system for a hydraulically hardened body according to claim 1, wherein the supply unit is provided at a lower part of a side wall of the carbonation curing tank.

12. The discharge part is provided at the top of the carbonation curing tank, 11. The carbonation curing system for a hydraulic hardened body according to claim 10, wherein the carbon dioxide delayed discharge mechanism comprises a carbon dioxide delay unit that supplies, to the discharge unit, the gas that has been circulated from the upper part of the carbonation curing tank to the lower part of the carbonation curing tank through a flow path cross-sectional area S2 that is smaller than the flow path cross-sectional area S1 when the gas has been circulated downward.

13. The carbon dioxide delay section an inner cylinder whose upper end is connected to the discharge portion, extends downward, and has an open lower end; an outer cylinder having a closed lower end, extending upward, and an open upper end, which covers the outer periphery of the inner cylinder from the outside; The carbonation curing system for a hydraulically hardened body according to claim 12, comprising:

14. The inside of the carbonation curing tank containing the hydraulic hardened body contains more CO than air. ２ a filling step of filling a gas containing high concentration carbon dioxide gas; a curing step of carbonating and curing the hydraulic hardened body with the carbon dioxide gas filled in the carbonation curing tank in the filling step; a discharging step of discharging gas containing at least carbon dioxide gas from the inside of the carbonation curing tank to the outside of the carbonation curing tank after the curing step; and In the curing step, CO ２ a gas containing the compound represented by the formula (I) is blown onto the surface of the hydraulically hardened body to carbonate and cure the hydraulically hardened body.

15. In the curing step, ２ 15. The method for managing carbonation curing of a hydraulically hardened body according to claim 14, wherein the hydraulically hardened body is carbonated by continuously applying a gas containing the compound at a flow rate of 0.05 m / s or more and 5.00 m / s or less to the surface of the hydraulically hardened body.

16. 16. The method for managing carbonation curing of a hydraulic hardened body according to claim 14 or 15, comprising a plurality of the carbonation curing tanks, the carbonation curing tanks being connected to each other, and a gas containing at least carbon dioxide gas discharged to the outside of one of the carbonation curing tanks being supplied to the inside of another of the carbonation curing tanks.

Images