EP-4741362-A1 - CEMENT COMPOSITION FOR FIXING CARBON DIOXIDE, CEMENT HARDENED BODY FOR FIXING CARBON DIOXIDE, AND METHOD FOR FIXING CARBON DIOXIDE

Abstract

A cement composition for carbon dioxide fixation, comprising a cement composition and a carbon dioxide absorbing liquid containing a carbon dioxide absorbent. A hardened cement for carbon dioxide fixation, comprising a hardened cement and a carbonate supported on the hardened cement. A carbon dioxide fixation method comprising: mixing a cement composition with a carbon dioxide absorbing liquid containing a carbon dioxide absorbent; hardening the cement composition containing the carbon dioxide absorbent to obtain a hardened cement for carbon dioxide fixation; and contacting the hardened cement with atmospheric air to fix the carbon dioxide contained in the atmospheric air in the hardened cement.

Inventors

• SAITO, RYOSUKE
• FUSHIMI, KOJI
• YODA, Yuya
• YANO, KEIICHI
• TSUJINO, Masato
• NISHIDA, AKIRA
• KITAGAKI, Ryoma
• ELAKNES, Yogarajah
• SENBOKU, Hisanori
• SAKAIRI, Masatoshi

Assignees

• Shimizu Corporation
• National University Corporation Hokkaido University

Dates

Publication Date

20260513

Application Date

20240614

Claims (13)

1. A cement composition for carbon dioxide fixation, comprising a cement composition and a carbon dioxide absorbing liquid containing a carbon dioxide absorbent.
2. The cement composition according to claim 1, wherein the carbon dioxide absorbing liquid has a pH of 8.0 or higher at 20°C.
3. The cement composition according to claim 1, wherein the carbon dioxide absorbing liquid contains carbon dioxide.
4. The cement composition according to claim 1, wherein an amount of the carbon dioxide absorbing liquid is 0.01 parts by mass or more and 100 parts by mass or less per 100 parts by mass of cement contained in the cement composition.
5. The cement composition according to claim 1, wherein the carbon dioxide absorbent is an alkaline compound.
6. The cement composition according to claim 1, wherein an amount of the carbon dioxide absorbent is 0.1 parts by mass or more and less than 5 parts by mass per 100 parts by mass of the cement composition.
7. The cement composition according to claim 1, wherein an amount of the carbon dioxide absorbent is 0.1 parts by mass or more and less than 5 parts by mass per 100 parts by mass of the cement composition, and the carbon dioxide absorbing liquid contains carbon dioxide.
8. The cement composition according to claim 1, wherein the carbon dioxide absorbent is an amine compound, an amount of the carbon dioxide absorbent is 0.1 parts by mass or more and less than 5 parts by mass per 100 parts by mass of the cement composition, and the carbon dioxide absorbing liquid contains carbon dioxide.
9. A hardened cement for carbon dioxide fixation, comprising a hardened cement and a carbonate supported on the hardened cement.
10. The hardened cement according to claim 9, wherein an amount of the carbonate is 0 parts by mass or more and 50 parts by mass or less per 100 parts by mass of the hardened cement.
11. The hardened cement according to claim 9, wherein the hardened cement is concrete.
12. A carbon dioxide fixation method comprising: mixing a cement composition with a carbon dioxide absorbing liquid containing a carbon dioxide absorbent; hardening the cement composition containing the carbon dioxide absorbent to obtain a hardened cement for carbon dioxide fixation; and contacting the hardened cement with atmospheric air to fix the carbon dioxide contained in the atmospheric air in the hardened cement.
13. A carbon dioxide fixation method comprising: mixing a cement composition with a carbon dioxide absorbing liquid containing a carbon dioxide absorbent and a pre-dissolved carbon dioxide; hardening the cement composition containing the carbon dioxide absorbent to obtain a hardened cement for carbon dioxide fixation; and contacting the hardened cement with atmospheric air to fix the carbon dioxide contained in the atmospheric air in the hardened cement.

Description

TECHNICAL FIELD The present invention relates to a cement composition for carbon dioxide fixation, a hardened cement for carbon dioxide fixation, and a carbon dioxide fixation method. Priority is claimed on Japanese Patent Application No. 2023-110225, filed July 4, 2023, the contents of which are incorporated herein by reference. BACKGROUND ART For the purpose of preventing global warming, there is a global demand for reducing carbon dioxide (CO2) emissions. In the construction materials field, proposals have been made on a method to reduce the amount of CO2 generated during concrete production by reducing the amount of cement, as well as concrete-related technologies that can fix (absorb) CO2 (see, for example, Patent Document 1). With regard to technologies for accelerating the fixation of CO2 in newly constructed concrete, for example, the technology described in Patent Document 2 is known. The technology described in Patent Document 2 accelerates carbonation from the surface by exposing a concrete structure that is not yet fully carbonated, such as newly constructed concrete, to a high-concentration CO2 gas environment. Citation List Patent Document Patent Document 1: Japanese Patent Granted Publication No. 4822373Patent Document 2: Japanese Unexamined Patent Application Publication No. 2014-51422 SUMMARY OF INVENTION Technical Problem For carrying out carbonation treatment, it is necessary to cure the periphery of the concrete structure with a sheet or the like so that CO2 gas does not leak to the outside. This method is not always easy depending on the shape of the concrete structure, and there is a concern that CO2 gas may leak to the outside. The present invention has been made in view of the above circumstances, and an object thereof is to provide a cement composition for carbon dioxide fixation, a hardened cement for carbon dioxide fixation, and a carbon dioxide fixation method, which allow carbon dioxide to be fixed without leaking to the outside. Solution to Problem Embodiments of the present invention made in order to solve the above-mentioned problem are as enumerated below. [1] A cement composition for carbon dioxide fixation, comprising a cement composition and a carbon dioxide absorbing liquid containing a carbon dioxide absorbent.[2] The cement composition according to [1], wherein the carbon dioxide absorbing liquid has a pH of 8.0 or higher at 20°C.[3] The cement composition according to [1] or [2], wherein the carbon dioxide absorbing liquid contains carbon dioxide.[4] The cement composition according to any one of [1] to [3], wherein an amount of the carbon dioxide absorbing liquid is 0.01 parts by mass or more and 100 parts by mass or less per 100 parts by mass of cement contained in the cement composition.[5] The cement composition according to any one of [1] to [4], wherein the carbon dioxide absorbent is an alkaline compound.[6] The cement composition according to any one of [1] to [5], wherein an amount of the carbon dioxide absorbent is 0.1 parts by mass or more and less than 5 parts by mass per 100 parts by mass of the cement composition.[6-1] The cement composition according to any one of [1] to [6], wherein an amount of the carbon dioxide absorbent is 0.1 to 4 parts by mass, 0.2 to 3. 5 parts by mass, 0.3 to 3 parts by mass, 0.4 to 3 parts by mass, 0.45 to 2.5 parts by mass, 0.45 to 2.0 parts by mass, or 0.45 to 1.5 parts by mass, per 100 parts by mass of the cement composition.[7] The cement composition according to any one of [1] to [6-1], wherein an amount of the carbon dioxide absorbent is 0.1 to less than 5 parts by mass, per 100 parts by mass of the cement composition, and the carbon dioxide absorbing liquid contains carbon dioxide.[8] The cement composition according to any one of [1] to [7], wherein the carbon dioxide absorbent is an amine compound, an amount of the carbon dioxide absorbent is 0.1 parts by mass or more and less than 5 parts by mass per 100 parts by mass of the cement composition, and the carbon dioxide absorbing liquid contains carbon dioxide.[9] A hardened cement for carbon dioxide fixation, comprising a hardened cement and a carbonate supported on the hardened cement.[10] The hardened cement according to [9], wherein an amount of the carbonate is 0 parts by mass or more and 50 parts by mass or less per 100 parts by mass of the hardened cement.[11] The hardened cement according to [9] or [10], wherein the hardened cement is concrete.[12] A carbon dioxide fixation method comprising: mixing a cement composition with a carbon dioxide absorbing liquid containing a carbon dioxide absorbent;hardening the cement composition containing the carbon dioxide absorbent to obtain a hardened cement for carbon dioxide fixation; andcontacting the hardened cement with atmospheric air to fix the carbon dioxide contained in the atmospheric air in the hardened cement.[13] A carbon dioxide fixation method comprising: mixing a cement composition with a carbon dioxide absorb