JPWO2021105726A5

JPWO2021105726A5 -

Info

Publication number: JPWO2021105726A5
Application number: JP2022531030A
Authority: JP
Publication date: 2023-10-31

Description

ＣＯ₂の吸着および放出を促進し、したがってコンクリート混合物中の炭素の均一な拡散を促進するために、リサイクルされていない骨材材料は、ＣＯ ₂ を吸着し、セメントの混合および硬化中に発生する発熱反応によって発生した熱に起因して吸着したＣＯ₂をコンクリート混合物に放出することができる骨材材料を含む。いくつかの実施形態では、リサイクルされていない骨材材料は、ＣＯ₂を吸着および放出することができる骨材材料であるポゾラン材料を含む。例えば、ポゾラン材料は、３０℃の温度で吸着されたＣＯ₂を放出し、したがって、ＣＯ₂吸着骨材材料がＣＯ₂吸着ポゾラン材料を含む場合、ＣＯ₂吸着骨材材料は、セメント混合チャンバ１４０においてＣＯ₂吸着骨材材料をセメントおよび水と混合する間に到達する温度（すなわち、３０℃～６０℃の温度）でＣＯ₂を放出する。リサイクルされていない骨材材料のポゾラン材料は、天然ポゾラン材料、人工ポゾラン材料、またはそれらの組み合わせであり得る。天然ポゾラン材料の例には、火山灰、軽石、軽石粉（軽石質軽石など）、軽石、イグニンブライト、膨張頁岩、ゼオライト、メタカオリン、ならびに籾殻灰およびナツメヤシの木灰を含むシリカを含有する植物灰からの天然ポゾランが含まれる。人工ポゾラン材料の例には、フライアッシュ、スラグ、ガラス化カルシウムアルミノケイ酸塩（ＶＣＡＳ）、およびシリカフュームが含まれる。 In order to promote the adsorption and release of CO ₂ and therefore the uniform diffusion of carbon in the concrete mixture, non-recycled aggregate materials are used to adsorb CO ₂ and generate during cement mixing and curing. Contains an aggregate material that is capable of releasing adsorbed CO ₂ into the concrete mixture due to the heat generated by exothermic reactions. In some embodiments, the non-recycled aggregate material includes pozzolanic material, which is an aggregate material that can adsorb and release _CO2 . For example, pozzolanic materials release adsorbed _CO2 at a temperature of 30°C, so if the _CO2 adsorbing aggregate material comprises a _CO2 adsorbing pozzolanic material, the _CO2 adsorbing aggregate material CO ₂ is released at temperatures reached during mixing the CO ₂ adsorbing aggregate material with cement and water at 140 (ie, temperatures between 30° C. and 60° C.) . The pozzolanic material of the non-recycled aggregate material may be a natural pozzolanic material, an engineered pozzolanic material, or a combination thereof. Examples of natural pozzolanic materials include volcanic ash, pumice, pumice powder (such as pumice pumice), pumice, ignimbrite, expanded shale, zeolite, metakaolin, and from plant ashes containing silica, including rice husk ash and date palm wood ash. Contains natural pozzolan. Examples of engineered pozzolanic materials include fly ash, slag, vitrified calcium aluminosilicate (VCAS), and silica fume.

Claims

A method for diffusing _CO2 within a concrete mixture, the method comprising:
mixing an aggregate material with CO ₂ gas in a pretreatment chamber of a concrete preparation system to form a CO ₂ adsorbing aggregate material , the aggregate material comprising: volcanic ash, pumice, pumice powder, ignin; a pozzolanic material selected from brite, expanded shale, zeolite, metakaolin, vegetable ash, or combinations thereof, wherein the pozzolanic material has a peak CO ₂ adsorption rate of 6.0×10 ⁻⁴ mol/sec or more. , and the pozzolanic material releases the adsorbed CO ₂ at a temperature of 30°C to 60°C;
transferring the _CO2 adsorbing aggregate material from the pretreatment chamber to a cement mixing chamber of the concrete preparation system;
mixing the CO ₂ adsorbing aggregate material with cement and water at a temperature between 30° C. and 60° C. to form the concrete mixture, the step of mixing the CO ₂ adsorbing aggregate material comprising the pozzolanic material with cement and water; releasing CO 2 from the CO ₂ adsorbing aggregate material comprising the pozzolanic material and diffusing _{CO 2} _into the concrete mixture to form a carbonated concrete mixture;
method including .

2. The method of claim 1 , wherein the pozzolanic material comprises a _CO2 adsorption capacity of 0.4 mmol/gram or more.

2. The method of claim 1, wherein the concrete preparation system further comprises a _CO2 source coupled to the pretreatment chamber by a _CO2 input pipe.

4. The method of claim 3 , wherein the concrete preparation system further comprises an upstream flow meter fluidly coupled to the _CO2 input pipe and configured to measure the flow rate of _CO2 gas entering the pretreatment chamber.

mixing the aggregate material with the _CO2 gas in the pre-treatment chamber;
sending the aggregate material to the pretreatment chamber;
4. The method of claim 3 , comprising sending the _CO2 gas from the _CO2 source to the pretreatment chamber.

4. The method of claim 3 , wherein the CO ₂ gas is sent from the CO ₂ source to the pretreatment chamber at a flow rate of 300 ml/min to 1400 ml/min.

7. The method of claim 6 , wherein mixing the aggregate material with the _CO2 gas in the pre-treatment chamber further comprises agitating the aggregate material in the pre-treatment chamber.

The concrete preparation system further comprises: a cement source coupled to the cement mixing chamber by a cement input pipe; and a water source coupled to the cement mixing chamber by a water input pipe;
mixing the _CO2 adsorbing aggregate material with the cement and the water in the cement mixing chamber;
delivering the cement from the cement source to the cement mixing chamber;
2. The method of claim 1, comprising directing the water from the water source to the cement mixing chamber.

2. The method of claim 1, wherein the _CO2 adsorbing aggregate material is transferred from the pretreatment chamber to the cement mixing chamber via a chamber connection pipe.

the concrete preparation system further comprising a downstream flow meter coupled to the chamber connecting pipe;
10. The method of claim 9 , wherein the downstream flow meter is configured to measure the flow rate of _CO2 adsorbing aggregate material entering the cement mixing chamber.

A method for diffusing _CO2 within a concrete mixture, the method comprising:
mixing an aggregate material with CO ₂ gas to form a CO ₂ adsorbing aggregate material in a pretreatment chamber of a concrete preparation system , the aggregate material comprising: volcanic ash, pumice, pumice powder, ignite powder; a pozzolanic material selected from embrite, expanded shale, zeolite, metakaolin, vegetable ash, or combinations thereof, wherein the pozzolanic material has a peak CO ₂ adsorption rate of 6.0×10 ⁻⁴ mol/sec or more. and the pozzolanic material releases the adsorbed CO ₂ at a temperature of 30°C to 60°C;
transferring the _CO2 adsorbing aggregate material from the pretreatment chamber to a cement mixing chamber of the concrete preparation system via a chamber connection pipe;
mixing the CO ₂ adsorbing aggregate material with cement and water at a temperature of 30° C. to 60° C. to form the concrete mixture, the mixing of the CO ₂ adsorbing aggregate material with the cement and water comprising: releasing CO 2 from the CO 2 adsorbing aggregate material and diffusing the CO 2 _into _the concrete _mixture to form a carbonated concrete mixture;
method including .

The pozzolanic material has a content of 0 . 12. The method of claim 11 , comprising a _CO2 adsorption capacity of 4 mmol/gram or more.

The concrete preparation system further comprises a _CO2 source coupled to the pretreatment chamber by a _CO2 input pipe, and mixing the aggregate material with the _CO2 gas in the pretreatment chamber comprises :
sending the aggregate material to the pretreatment chamber;
12. The method of claim 11 , comprising sending the _CO2 gas from the _CO2 source to the pretreatment chamber.

The concrete preparation system further comprises: a cement source coupled to the cement mixing chamber by a cement input pipe; and a water source coupled to the cement mixing chamber by a water input pipe;
mixing the _CO2 adsorbing aggregate material with the cement and the water in the cement mixing chamber;
delivering the cement from the cement source to the cement mixing chamber;
12. The method of claim 11 , comprising directing the water from the water source to the cement mixing chamber.