System and method for steam curing and carbonation curing precast concrete

Patent metadata

Field	Value
Publication number	US-2024254059-A1
Application number	US-202318392381-A
Country	US
Kind code	A1
Filing date	Dec 21, 2023
Priority date	Feb 1, 2023
Publication date	Aug 1, 2024
Grant date	—

Abstract

A system and method for steam curing and carbonation curing precast concrete, including: a steam curing tank forming a steam curing space; a carbonation curing tank disposed within the steam curing space and forming a carbonation curing space; a mold disposed within the carbonation curing space and forming a concrete shaping space by a plurality of segments; and a demolding device configured to separate the plurality of segments from one another to open the concrete shaping space.

First claim

What is claimed is:

1 . A system for steam curing and carbonation curing precast concrete, the system comprising:
a steam curing tank forming a steam curing space; a carbonation curing tank disposed within the steam curing space and forming a carbonation curing space; a mold disposed within the carbonation curing space and forming a concrete shaping space by a plurality of segments; and a demolding device configured to separate the plurality of segments from one another to open the concrete shaping space.

2 . The system according to claim 1 , wherein the plurality of segments form a gap through which carbon dioxide injected into the carbonation curing space flows into the concrete shaping space as each of the plurality of segments is pulled toward an inner surface of the carbonation curing tank by the demolding device.

3 . The system according to claim 2 , wherein the demolding device comprises:
a first magnet being coupled, respectively, to the plurality of segments; and a first shuttering magnet being coupled to the carbonation curing tank and generating a magnetic force of opposite polarity to the first magnet.

4 . The system according to claim 3 , further comprising a pressurizing device configured to press each of the plurality of segments in a direction away from the inner surface of the carbonation curing tank to prevent the concrete shaping space from arbitrarily being opened due to the plurality of segments being pushed towards the inner surface of the carbonation curing tank by a concrete casting pressure,
wherein the pressurizing device comprises: a second magnet being coupled, respectively, to the plurality of segments; and a second shuttering magnet being coupled to the carbonation curing tank and generating a magnetic force of the same polarity as the second magnet.

5 . The system according to claim 4 , further comprising a power generation unit configured to supply power required for driving the demolding device and the pressurizing device,
wherein the power generation unit is configured to generate power using the pressure of steam injected into the steam curing space.

6 . The system according to claim 5 , wherein the power generation unit comprises:
a collision plate facing a steam injection port within the steam curing space; and a piezoelectric element arranged on the collision plate.

7 . The system according to claim 1 , further comprising:
a boiler; a steam injection unit configured to inject steam produced by the boiler into the steam curing space; and a carbon dioxide injection unit configured to inject carbon dioxide into the carbonation curing space.

8 . The system according to claim 7 , wherein the carbon dioxide injection unit comprises:
a carbon dioxide collector configured to separate carbon dioxide from the exhaust gas of the boiler; and a carbon dioxide storage tank configured to temporarily store carbon dioxide separated from the carbon dioxide collector.

9 . The system according to claim 8 , wherein carbon dioxide injection unit further comprises a carbon dioxide recovery line configured to recover carbon dioxide from the carbonation curing tank and store the recovered carbon dioxide in the carbon dioxide storage tank.

10 . The system according to claim 7 , further comprising a control unit configured to control the demolding device, the steam injection unit and the carbon dioxide injection unit,
wherein the control unit is configured to drive the steam injection unit to initiate steam curing and then drive the demolding device and the carbon dioxide injection unit to initiate carbonation curing.

11 . The system according to claim 10 , wherein the control unit is configured to initiate carbonation curing after a predetermined time has elapsed after initiating steam curing, the predetermined time being a time sufficient to develop a minimum strength for retaining the shape in precast concrete.

12 . The system according to claim 1 , wherein the carbonation curing tank comprises a container and a lid configured to open and close an opened top surface of the container, and
wherein the plurality of segments comprises: a plurality of first segments coupled to the container and configured to partition lateral surfaces of the concrete shaping space; and a second segment coupled to the lid and configured to partition a top surface of the concrete shaping space.

13 . The system according to claim 12 , wherein the mold further comprises a platform disposed on a bottom surface of the container to partition a bottom surface of the concrete shaping space.

14 . The system according to claim 13 , wherein the first segments is provided with first stopper projections at lower ends of the first segments, the first stopper projections being inserted into insertion grooves formed on a lateral surface of the platform.

15 . The system according to claim 12 , wherein the second segment is provided with second stopper projections along edges of the second segment, the second stopper projections being configured to support outer surfaces of the first segments.

16 . The system according to claim 1 , wherein the plurality of segments are each movably coupled to the carbonation curing tank via a buffer spring.

17 . A method of steam curing and carbonation curing precast concrete, the method comprising:
casting pre-prepared concrete into a mold; initiating high-temperature curing by heating a carbonation curing tank enveloping the mold; and initiating carbonation curing by removing the mold and injecting carbon dioxide into the carbonation curing tank.

18 . The method according to claim 17 , wherein, in the step of initiating carbonation curing, carbonation curing is initiated when a predetermined time has elapsed after initiating the high-temperature curing, the predetermined time being a time sufficient to develop a minimum strength for retaining the shape in precast concrete.

19 . The method according to claim 17 , wherein the mold comprises a plurality of segments forming a concrete shaping space in the carbonation curing tank,
wherein the plurality of segments is separated from one another by a demolding device to open the concrete shaping space, and wherein the demolding device comprises first magnets being coupled, respectively, to the plurality of segments and a first shuttering magnet coupled to the carbonation curing tank and configured to generate a magnetic force opposite to a polarity of the first magnets.

20 . The method according to claim 19 , wherein the carbonation curing tank comprises a container and a lid configured to open and close an opened top surface of the container,
wherein the plurality of segments comprises a plurality of first segments coupled to the container and configured to partition lateral surfaces of the concrete shaping space and a second segment coupled to the lid and configured to partition a top surface of the concrete shaping space, and wherein, in the step of casting pre-prepared concrete, the concrete is cast into the concrete shaping space through a top surface of the concrete shaping space being opened by separating the lid from the container.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Lee Haeng-Ki
• Park Jihoon
• Cho Alam
• Kim Naru
• Jang Daeik

Classifications

• C04B40/0231

  Carbon dioxide hardening · CPC title

• F22B37/26

  Steam-separating arrangements · CPC title

• F22B1/1815

  using the exhaust gases of gas-turbines · CPC title

• F01K23/02

  the engine cycles being thermally coupled · CPC title

• C04B40/024

  Steam hardening, e.g. in an autoclave · CPC title