JPH06144944A - Method for carbonating porous calcium silicate hydrate - Google Patents
Method for carbonating porous calcium silicate hydrateInfo
- Publication number
- JPH06144944A JPH06144944A JP30221292A JP30221292A JPH06144944A JP H06144944 A JPH06144944 A JP H06144944A JP 30221292 A JP30221292 A JP 30221292A JP 30221292 A JP30221292 A JP 30221292A JP H06144944 A JPH06144944 A JP H06144944A
- Authority
- JP
- Japan
- Prior art keywords
- calcium silicate
- silicate hydrate
- porous calcium
- carbon dioxide
- surface area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は多孔質珪酸カルシウム水
和物の炭酸化処理方法に関し、特にその比表面積を著し
く増大させる炭酸化処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carbonation treatment method for porous calcium silicate hydrate, and more particularly to a carbonation treatment method for significantly increasing its specific surface area.
【０００２】[0002]
【従来の技術】多孔質珪酸カルシウム水和物を主成分と
する軽量気泡コンクリート（以下ＡＬＣと略称する）
は、建材や断熱材として多用されている。ＡＬＣ製造工
場において若干の不良品（微細なクラック等が入った程
度のもの）が発生する事がある。また、ビルや住宅の建
設現場や断熱材の施工現場においては、ＡＬＣの端材
（切れ端）が多く発生しており、これらＡＬＣの不良品
やＡＬＣの端材は、たいてい廃棄処分されている。2. Description of the Related Art Light-weight cellular concrete (hereinafter abbreviated as ALC) whose main component is porous calcium silicate hydrate
Is widely used as a building material and heat insulating material. A few defective products (those with minute cracks, etc.) may occur in the ALC manufacturing plant. Further, at the construction sites of buildings and houses and construction sites of heat insulating materials, many ALC scraps (broken pieces) are generated, and these defective ALC products and ALC scraps are usually discarded.
【０００３】しかし、ＡＬＣの端材はむろん、ＡＬＣの
不良品も組成的には正常な製品と何ら変わらないもので
ある。そのため端材を廃棄処分せずに有効利用すること
が求められているところである。ＡＬＣの成分である多
孔質珪酸カルシウム水和物は多孔体であるため、多くの
細孔を持ち、３０ｍ2 ／ｇ前後の比表面積を有する。ま
た、自然条件下での炭酸化及び炭酸ガスによる強制炭酸
化を行った多孔質珪酸カルシウムにおいては、６０ｍ2
／ｇ程度となることが知られている。前記の事実から本
発明者は、この特徴を生かす多孔質珪酸カルシウムの利
用法、例えば多孔質珪酸カルシウム水和物を吸湿剤とし
て利用することについて検討を行った。[0003] However, not only the ALC scraps, but also the defective ALCs are the same in composition as normal products. Therefore, it is required to effectively use the scraps without discarding them. Since the porous calcium silicate hydrate, which is a component of ALC, is a porous body, it has many pores and a specific surface area of about 30 m 2 / g. In addition, in the case of porous calcium silicate that has been carbonated under natural conditions and forcibly carbonized by carbon dioxide, 60 m 2
It is known to be about / g. Based on the above facts, the present inventor has conducted a study on a method of utilizing porous calcium silicate that makes use of this characteristic, for example, utilizing porous calcium silicate hydrate as a hygroscopic agent.
【０００４】[0004]
【発明が解決しようとする課題】しかし、前記多孔質珪
酸カルシウム水和物は、上記のようにかなりの比表面積
を有するものの、その吸湿率は従来の吸湿剤に比べて小
さく、実用に向くものではなかった。従って本発明は、
多孔質珪酸カルシウム水和物を利用することによって、
吸湿剤にも使用しうる多孔質珪酸カルシウム水和物を得
るための炭酸化処理方法を提供することを目的とするも
のである。However, although the above-mentioned porous calcium silicate hydrate has a considerable specific surface area as described above, its moisture absorption rate is smaller than that of conventional moisture absorbents and is suitable for practical use. Was not. Therefore, the present invention is
By utilizing porous calcium silicate hydrate,
It is an object of the present invention to provide a carbonation treatment method for obtaining a porous calcium silicate hydrate that can be used as a hygroscopic agent.
【０００５】[0005]
【課題を解決するための手段】本発明の第１は、多孔質
珪酸カルシウム水和物を、炭酸ガスの溶解した水の存在
下で炭酸化する事を特徴とする多孔質珪酸カルシウム水
和物の炭酸化処理方法であり、第２は、炭酸ガスの溶解
した水の重量が多孔質珪酸カルシウム水和物の４倍以上
１０００倍以下で、多孔質珪酸カルシウム水和物を反応
させる方法であり、第３は、ゾノライト、トバモライ
ト、ジャイロライト、フォシャジャイト、ヒレブランダ
イトから選ばれる１種または、２種以上の混合物である
多孔質珪酸カルシウム水和物を炭酸ガスの溶解した水の
存在下で炭酸化する事を特徴とする多孔質珪酸カルシウ
ム水和物の炭酸化処理方法である。The first aspect of the present invention is to characterize a porous calcium silicate hydrate by carbonating it in the presence of water in which carbon dioxide gas is dissolved. The second is a method of reacting porous calcium silicate hydrate when the weight of water in which carbon dioxide gas is dissolved is 4 times or more and 1000 times or less that of the porous calcium silicate hydrate. The third is the presence of water in which carbon dioxide gas is dissolved in a porous calcium silicate hydrate, which is one kind or a mixture of two or more kinds selected from zonolite, tobermorite, gyrolite, foshaygit, and hellebrandite. It is a method for carbonating a porous calcium silicate hydrate, which is characterized in that it is carbonated by.
【０００６】本発明に使用する多孔質珪酸カルシウム水
和物としては、例えば珪酸質原料と石灰質原料とを混合
してスラリ−状にしたものをそのまま高温高圧水蒸気養
生、あるいは該スラリーに発泡剤、起泡剤などの気泡生
成剤をも混合したスラリ−状物を型枠内で硬化した後、
高温高圧水蒸気養生してなるＡＬＣ等の無機多孔質の人
工鉱物等を挙げることができる。この多孔質珪酸カルシ
ウム水和物には、前記のＡＬＣ等の製造工程で発生する
不良品や、ビルや住宅等への建設中に発生する端材など
を使用することができる。As the porous calcium silicate hydrate used in the present invention, for example, a mixture of a siliceous raw material and a calcareous raw material and made into a slurry form is directly subjected to high temperature high pressure steam curing, or a foaming agent for the slurry, After curing the slurry-like material mixed with a foaming agent such as a foaming agent in the mold,
Examples thereof include inorganic porous artificial minerals such as ALC obtained by curing at high temperature and high pressure steam. As the porous calcium silicate hydrate, defective products generated in the manufacturing process such as ALC described above and scraps generated during the construction of a building or a house can be used.
【０００７】多孔質珪酸カルシウム水和物の具体的成分
としては、ゾノトライト、トバモライト、ジャイロライ
ト、フォシャジャイト、ヒレブランダイト等であり、こ
れらの成分のうちいずれか１つを単独成分とするもので
も、２種類以上を混合成分とするものでもよい。また、
ＣＳＨゲルや未反応の珪酸質原料等が含まれていても良
い。Specific components of the porous calcium silicate hydrate include zonotolite, tobermorite, gyrolite, foshagitite, hellebrandite, etc., and any one of these components is a single component. However, a mixture of two or more kinds may be used. Also,
CSH gel, unreacted siliceous raw material, etc. may be contained.
【０００８】多孔質珪酸カルシウム水和物の粒径は特に
限定されるものではないが、反応性や製品の利用性から
０．６ｍｍ以下が好ましい。炭酸ガスの溶解した水を得
るには、炭酸ガスを公知の方法によって蒸留水等の水に
溶解させれば良く、例えば水に炭酸ガスを吹き込む方法
等が挙げられる。炭酸ガスの濃度は特に限定されない
が、炭酸ガス溶液のｐＨが４〜５程度となる様に炭酸ガ
スを溶解させれば、効率良く多孔質珪酸カルシウム水和
物の炭酸化を行うことができる。The particle size of the porous calcium silicate hydrate is not particularly limited, but is preferably 0.6 mm or less from the viewpoint of reactivity and availability of products. To obtain water in which carbon dioxide gas is dissolved, carbon dioxide gas may be dissolved in water such as distilled water by a known method, and examples thereof include a method of blowing carbon dioxide gas into water. The concentration of carbon dioxide gas is not particularly limited, but if carbon dioxide gas is dissolved so that the pH of the carbon dioxide gas solution is about 4 to 5, carbonation of the porous calcium silicate hydrate can be efficiently performed.
【０００９】本発明の多孔質珪酸カルシウム水和物を炭
酸ガスの溶解した水の存在下で炭酸化するには、炭酸ガ
スの溶解した水と多孔質珪酸カルシウム水和物を接触さ
せれば良く、前記炭酸ガス溶解水中に多孔質珪酸カルシ
ウム水和物を浸漬させる方法などが挙げられる。炭酸化
反応中に、炭酸ガス溶解水中へ炭酸ガスを吹き込むなど
して常に溶解水中の炭酸ガス濃度をある程度に保ってお
けば、より効率良く炭酸化を行うことができる。To carbonize the porous calcium silicate hydrate of the present invention in the presence of water in which carbon dioxide gas is dissolved, it is sufficient to bring the water in which carbon dioxide gas is dissolved into contact with the porous calcium silicate hydrate. , A method of immersing the porous calcium silicate hydrate in the carbon dioxide gas-dissolved water. If carbon dioxide concentration in the dissolved water is always kept to some extent by blowing carbon dioxide gas into the carbon dioxide dissolved water during the carbonation reaction, carbonation can be performed more efficiently.
【００１０】炭酸ガスの溶解した水の、多孔質珪酸カル
シウム水和物に対する重量比は、４倍以上１０００倍以
下であると、製造直後の多孔質珪酸カルシウム水和物と
比較して、比表面積が３倍以上となるので好ましく、さ
らに好ましくは５０倍以上１００倍以下である。When the weight ratio of the water in which carbon dioxide gas is dissolved to the porous calcium silicate hydrate is 4 times or more and 1000 times or less, the specific surface area is larger than that of the porous calcium silicate hydrate immediately after the production. Is preferably 3 times or more, and more preferably 50 times or more and 100 times or less.
【００１１】[0011]
【作用】多孔質珪酸カルシウム水和物を炭酸化処理する
ことにより、多孔質珪酸カルシウム水和物中にシリカゲ
ルと炭酸カルシウムが生成するが、本発明のようにこの
反応を大量の水溶液中にて行えば、カルシウム分が水溶
液中に溶解し、生成物のグラム当たりのシリカゲルの量
が増大し、比表面積がさらに増大する。[Function] By subjecting the porous calcium silicate hydrate to carbonation, silica gel and calcium carbonate are produced in the porous calcium silicate hydrate. This reaction is carried out in a large amount of aqueous solution as in the present invention. If done, the calcium content will dissolve in the aqueous solution, increasing the amount of silica gel per gram of product and further increasing the specific surface area.
【００１２】[0012]
【実施例】以下に、実施例、比較例を用いて本発明をさ
らに詳しく説明する。実施例、比較例に示す比表面積、
及び吸湿率は、以下の方法で測定した。 比表面積測定 日機装製ベータソープ表面積計を用いて測定した。EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples. Specific surface area shown in Examples and Comparative Examples,
The moisture absorption rate was measured by the following method. Specific surface area measurement The surface area was measured using a beta soap surface area meter manufactured by Nikkiso.
【００１３】吸湿率測定 ＪＩＳ Ｚ０７０１の測定方法に従い測定した。Moisture Absorption Rate Measurement It was measured according to the measuring method of JIS Z0701.
【００１４】[0014]
【参考例】ビル建設現場で発生したＡＬＣ端材を回収
し、クラッシャーで潰してから、中の鉄筋を引き抜いた
のち、ハンマーミルで粗粉砕した。このようにして得た
粗粉砕物をふるい分けて、平均粒径が０．６ｍｍ以下の
粉状ＡＬＣを得た。このＡＬＣ粉（含水率３０％程度）
の比表面積及び吸湿率を表１に示す。このＡＬＣ粉を以
下の実施例及び比較例で使用した。[Reference Example] ALC mill ends generated at a building construction site were collected, crushed by a crusher, the reinforcing bars in the inside were pulled out, and then coarsely crushed by a hammer mill. The coarsely pulverized product thus obtained was sieved to obtain powdery ALC having an average particle size of 0.6 mm or less. This ALC powder (water content about 30%)
Table 1 shows the specific surface area and moisture absorption of the. This ALC powder was used in the following examples and comparative examples.
【００１５】[0015]
【実施例１】蒸留水に炭酸ガスを吹き込み飽和させの
ち、ｐＨを４．４程度に調整した溶液に参考例で得たＡ
ＬＣ粉の重量比率を４：１で添加し、この溶液中に炭酸
ガスを５００ｃｃ／ｍｉｎで流し込んだまま、攪拌機で
３００ｒｐｍの攪拌速度で攪拌する。この状態で８時間
反応させる。その後前記溶液からＡＬＣ粉をろ別し乾燥
することによって炭酸化ＡＬＣ粉を得た。得られた炭酸
化ＡＬＣ粉について、比表面積及び吸湿率を測定した。
この結果を表１に示す。Example 1 Carbon dioxide gas was blown into distilled water to saturate it, and then the solution of which pH was adjusted to about 4.4 was obtained in Reference Example A.
The LC powder was added at a weight ratio of 4: 1 and stirred with a stirrer at a stirring speed of 300 rpm while carbon dioxide gas was poured into the solution at 500 cc / min. In this state, the reaction is carried out for 8 hours. Thereafter, ALC powder was filtered from the solution and dried to obtain carbonated ALC powder. The specific surface area and moisture absorption rate of the obtained carbonated ALC powder were measured.
The results are shown in Table 1.
【００１６】[0016]
【実施例２】実施例１において、炭酸ガスの溶解した蒸
留水とＡＬＣ粉の重量比率を５０：１で添加した以外は
同様の方法によって炭酸化ＡＬＣ粉を得た。得られた炭
酸化ＡＬＣ粉について、比表面積及び吸湿率を測定し
た。この結果を表１に示す。Example 2 Carbonated ALC powder was obtained by the same method as in Example 1 except that the weight ratio of distilled water in which carbon dioxide gas was dissolved and ALC powder was added at 50: 1. The specific surface area and moisture absorption rate of the obtained carbonated ALC powder were measured. The results are shown in Table 1.
【００１７】[0017]
【実施例３】実施例１において、炭酸ガスの溶解した蒸
留水とＡＬＣ粉の重量比率を１００：１で添加した以外
は同様の方法によって炭酸化ＡＬＣ粉を得た。得られた
炭酸化ＡＬＣ粉について、比表面積及び吸湿率を測定し
た。この結果を表１に示す。Example 3 Carbonated ALC powder was obtained by the same method as in Example 1 except that the weight ratio of distilled water in which carbon dioxide gas was dissolved and ALC powder was added at 100: 1. The specific surface area and moisture absorption rate of the obtained carbonated ALC powder were measured. The results are shown in Table 1.
【００１８】[0018]
【実施例４】実施例１において、炭酸ガスの溶解した蒸
留水とＡＬＣ粉の重量比率を１０００：１で添加した以
外は同様の方法によって炭酸化ＡＬＣ粉を得た。得られ
た炭酸化ＡＬＣ粉について、比表面積及び吸湿率を測定
した。この結果を表１に示す。Example 4 Carbonated ALC powder was obtained by the same method as in Example 1 except that the weight ratio of distilled water in which carbon dioxide gas was dissolved and ALC powder was added at 1000: 1. The specific surface area and moisture absorption rate of the obtained carbonated ALC powder were measured. The results are shown in Table 1.
【００１９】[0019]
【比較例１】参考例のＡＬＣ粉重量比率を炭酸ガス雰囲
気中に３６時間放置後取り出し、乾燥させることによっ
て炭酸化ＡＬＣ粉を得た。得られた炭酸化ＡＬＣ粉につ
いて、比表面積及び吸湿率を測定した。この結果を表１
に示す。Comparative Example 1 Carbonated ALC powder was obtained by allowing the ALC powder weight ratio of Reference Example to stand in a carbon dioxide gas atmosphere for 36 hours, then taking it out and drying it. The specific surface area and moisture absorption rate of the obtained carbonated ALC powder were measured. The results are shown in Table 1.
Shown in.
【００２０】[0020]
【表１】 [Table 1]
【００２１】[0021]
【発明の効果】本発明の構成にすることにより、簡便な
方法によって多孔質珪酸カルシウム水和物の比表面積を
向上させ、吸湿率を増大させた多孔質珪酸カルシウム水
和物を提供することができる。また、アルカリ分が低い
ことにより、製品の用途が従来の多孔質珪酸カルシウム
と比較して、広くなる。さらに、いままで廃棄されてい
たＡＬＣ端材を安価な方法によって有効利用できる。EFFECTS OF THE INVENTION With the constitution of the present invention, it is possible to provide a porous calcium silicate hydrate having an improved moisture absorption rate by improving the specific surface area of the porous calcium silicate hydrate by a simple method. it can. In addition, the low alkali content makes the product more versatile than conventional porous calcium silicates. Furthermore, the ALC scraps that have been discarded until now can be effectively used by an inexpensive method.
Claims (3)
スの溶解した水の存在下で炭酸化させる事を特徴とする
多孔質珪酸カルシウム水和物の炭酸化処理方法1. A method for carbonating a porous calcium silicate hydrate, which comprises carbonizing the porous calcium silicate hydrate in the presence of water in which carbon dioxide gas is dissolved.
酸カルシウム水和物の４倍以上１０００倍以下である、
請求項１に記載の多孔質珪酸カルシウム水和物の炭酸化
処理方法2. The weight of water in which carbon dioxide gas is dissolved is 4 times or more and 1000 times or less that of the porous calcium silicate hydrate.
The method for carbonating the porous calcium silicate hydrate according to claim 1.
ト、トバモライト、ジャイロライト、フォシャジャイ
ト、ヒレブランダイトから選ばれる１種または、２種以
上の混合物である請求項１に記載の多孔質珪酸カルシウ
ム水和物の炭酸化処理方法3. The porous silicic acid according to claim 1, wherein the porous calcium silicate hydrate is one kind or a mixture of two or more kinds selected from zonolite, tobermorite, gyrolite, foshajite and hilebrandite. Carbonation method of calcium hydrate
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30221292A JPH06144944A (en) | 1992-11-12 | 1992-11-12 | Method for carbonating porous calcium silicate hydrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30221292A JPH06144944A (en) | 1992-11-12 | 1992-11-12 | Method for carbonating porous calcium silicate hydrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06144944A true JPH06144944A (en) | 1994-05-24 |
Family
ID=17906307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30221292A Withdrawn JPH06144944A (en) | 1992-11-12 | 1992-11-12 | Method for carbonating porous calcium silicate hydrate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06144944A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001034294A1 (en) * | 1999-11-12 | 2001-05-17 | University Of Greenwich | Silicate/aluminate materials |
| WO2002070425A1 (en) * | 2001-03-05 | 2002-09-12 | James Hardie Research Pty Limited | Low density calcium silicate hydrate strength accelerant additive for cementitious products |
| JP2011042514A (en) * | 2009-08-19 | 2011-03-03 | National Institute Of Advanced Industrial Science & Technology | Method for manufacturing porous structure |
| US8845940B2 (en) | 2012-10-25 | 2014-09-30 | Carboncure Technologies Inc. | Carbon dioxide treatment of concrete upstream from product mold |
| US9108883B2 (en) | 2013-06-25 | 2015-08-18 | Carboncure Technologies, Inc. | Apparatus for carbonation of a cement mix |
| US9376345B2 (en) | 2013-06-25 | 2016-06-28 | Carboncure Technologies Inc. | Methods for delivery of carbon dioxide to a flowable concrete mix |
| US9388072B2 (en) | 2013-06-25 | 2016-07-12 | Carboncure Technologies Inc. | Methods and compositions for concrete production |
| US9738562B2 (en) | 2013-06-25 | 2017-08-22 | Carboncure Technologies Inc. | Methods and compositions for concrete production |
| WO2017140435A1 (en) * | 2016-02-16 | 2017-08-24 | Linde Aktiengesellschaft | Initiation of cement hardening by the addition of carbon dioxide to the mixing water |
| US9790131B2 (en) | 2013-02-04 | 2017-10-17 | Carboncure Technologies Inc. | System and method of applying carbon dioxide during the production of concrete |
| US10350787B2 (en) | 2014-02-18 | 2019-07-16 | Carboncure Technologies Inc. | Carbonation of cement mixes |
| US10570064B2 (en) | 2014-04-07 | 2020-02-25 | Carboncure Technologies Inc. | Integrated carbon dioxide capture |
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| US11660779B2 (en) | 2016-04-11 | 2023-05-30 | Carboncure Technologies Inc. | Methods and compositions for treatment of concrete wash water |
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-
1992
- 1992-11-12 JP JP30221292A patent/JPH06144944A/en not_active Withdrawn
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| WO2001034294A1 (en) * | 1999-11-12 | 2001-05-17 | University Of Greenwich | Silicate/aluminate materials |
| WO2002070425A1 (en) * | 2001-03-05 | 2002-09-12 | James Hardie Research Pty Limited | Low density calcium silicate hydrate strength accelerant additive for cementitious products |
| US7041167B2 (en) | 2001-03-05 | 2006-05-09 | James Hardie International Finance B.V. | Low density accelerant and strength enhancing additive for cementitious products and methods of using same |
| AU2002302913B2 (en) * | 2001-03-05 | 2008-01-24 | James Hardie Technology Limited | Low density calcium silicate hydrate strength accelerant additive for cementitious products |
| JP2011042514A (en) * | 2009-08-19 | 2011-03-03 | National Institute Of Advanced Industrial Science & Technology | Method for manufacturing porous structure |
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| US9376345B2 (en) | 2013-06-25 | 2016-06-28 | Carboncure Technologies Inc. | Methods for delivery of carbon dioxide to a flowable concrete mix |
| US10350787B2 (en) | 2014-02-18 | 2019-07-16 | Carboncure Technologies Inc. | Carbonation of cement mixes |
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| WO2017140435A1 (en) * | 2016-02-16 | 2017-08-24 | Linde Aktiengesellschaft | Initiation of cement hardening by the addition of carbon dioxide to the mixing water |
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