JP2002201085A - Method of manufacturing carbonation cured compact - Google Patents
Method of manufacturing carbonation cured compactInfo
- Publication number
- JP2002201085A JP2002201085A JP2000397972A JP2000397972A JP2002201085A JP 2002201085 A JP2002201085 A JP 2002201085A JP 2000397972 A JP2000397972 A JP 2000397972A JP 2000397972 A JP2000397972 A JP 2000397972A JP 2002201085 A JP2002201085 A JP 2002201085A
- Authority
- JP
- Japan
- Prior art keywords
- calcium
- layer portion
- cured
- inner layer
- molded body
- 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.)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、水酸化カルシウム
および／または珪酸カルシウム系の粉体を成形したカル
シウム系成形体を、炭酸化養生して硬化体を形成する炭
酸硬化体の製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cured product of carbonic acid by curing a calcium-based molded product obtained by molding calcium hydroxide and / or calcium silicate-based powder to form a cured product. It is.
【０００２】[0002]
【従来の技術】水酸化カルシウムおよび／または珪酸カ
ルシウム系の原料粉体を成形した後に、そのカルシウム
系成形体を炭酸ガス中で炭酸化することにより炭酸硬化
体を製造する方法が一般に知られている。原料粉体を成
形する際は、原料粉体の流れ制御を容易にして型枠内へ
の充填性を良くしたり、また成形体の割れ・欠けを防い
だりするために、加水して原料粉体を所定の含水状態に
していた。また、原料特性やその成形方法によっては、
多分な含水状態になることもあった。2. Description of the Related Art There is generally known a method for producing a carbonated cured product by molding a raw material powder of calcium hydroxide and / or calcium silicate and then carbonating the calcium-based molded product in carbon dioxide gas. I have. When molding the raw material powder, water is added to the raw material powder to make it easier to control the flow of the raw material powder and improve the filling property in the mold, and to prevent cracking and chipping of the molded body. The body was in a predetermined wet state. Also, depending on the characteristics of the raw materials and the molding method,
Probably, it became a water-containing state.
【０００３】また、カルシウム系成形体の炭酸化反応の
結果、その成形体内部に反応水が生成される。すなわ
ち、珪酸カルシウムの炭酸化反応は、次の化学式で示さ
れるように、炭酸化にともないシリカ、炭酸カルシウ
ム、反応水（右端）が生成される。 ＣａＯ・ＳｉＯ2・Ｈ2Ｏ ＋ＣＯ2 →ＳｉＯ2＋ＣａＣ
Ｏ3＋Ｈ2Ｏ[0003] As a result of the carbonation reaction of the calcium-based compact, reaction water is produced inside the compact. That is, in the carbonation reaction of calcium silicate, as shown by the following chemical formula, silica, calcium carbonate, and reaction water (right end) are generated with carbonation. CaO ・ SiO 2・ H 2 O + CO 2 → SiO 2 + CaC
O 3 + H 2 O
【０００４】このように、水酸化カルシウムおよび／ま
たは珪酸カルシウム系の粉体原料から炭酸硬化体が製造
される際には、水が添加されたり炭酸化反応によって反
応水が成形体内部で生成されたりして、そのカルシウム
系成形体は比較的高い含水状態になる。[0004] As described above, when a carbonated cured product is produced from a powder material of calcium hydroxide and / or calcium silicate, water is added or reaction water is generated inside the molded product by a carbonation reaction. In some cases, the calcium-based molded body becomes relatively high in water content.
【０００５】[0005]
【発明が解決しようとする課題】含水状態で成形された
カルシウム系成形体は、その外層部から内層部に至るま
でほぼ均一な含水状態となる。このような状態で炭酸化
養生すると、成形体内部まで炭酸化反応が進行し難くな
る。その理由は次のように推察される。The calcium-based compact formed in a water-containing state has a substantially uniform water-containing state from the outer layer to the inner layer. If carbonation curing is performed in such a state, it becomes difficult for the carbonation reaction to progress to the inside of the molded body. The reason is presumed as follows.
【０００６】通常、成形体の炭酸化養生ではその初期段
階に炭酸ガスと容易に接触する成形体の表層部において
炭酸化が始まり、シリカの隙間を埋めるように緻密な炭
酸カルシウムが成形体表層部に形成される。このため、
表層部に最初に形成された緻密な炭酸カルシウムは、炭
酸ガスの成形体内層部への進行を妨げるようになる。ま
た、成形体全体がほぼ均一な含水状態、すなわち空隙中
の水分が占める容積率が成形体内でほぼ均一な状態であ
るため、炭酸化反応により生成された反応水が毛管現象
により成形体内部を移動することが少ない。このため、
先の表層部の炭酸化によって生成された反応水は、移動
することなく表層部に留まって、より炭酸ガスの成形体
内層部への進行を妨げる働きをする。従って、従来の成
形体全体がほぼ均一な含水状態（成形体の内部組織がほ
ぼ均一な場合）、言い換えれば、成形体内部の空隙中の
水分の占める容積率がほぼ均一であると、外層部から内
層部に向かうほど炭酸化反応が進行し難い状態となり、
内層部においては炭酸硬化反応が十分に成されない状況
であった。Normally, in the carbonation curing of the molded body, carbonation starts in the surface layer portion of the molded body which easily comes into contact with carbon dioxide gas at the initial stage, and dense calcium carbonate is filled in the surface layer of the molded body so as to fill the gaps of silica. Formed. For this reason,
The dense calcium carbonate first formed on the surface layer portion prevents the carbon dioxide gas from traveling to the molded body layer portion. In addition, since the entire molded body is substantially uniform in water, that is, the volume ratio occupied by moisture in the voids is substantially uniform in the molded body, the reaction water generated by the carbonation reaction causes the inside of the molded body to flow through the capillary phenomenon. Less likely to move. For this reason,
The reaction water generated by the carbonation of the surface layer stays at the surface layer without moving, and functions to further prevent the carbon dioxide gas from traveling to the layer in the molded body. Therefore, when the entire conventional molded body is substantially uniform in a water-containing state (when the internal structure of the molded body is substantially uniform), in other words, when the volume ratio of water in the voids inside the molded body is substantially uniform, the outer layer portion , The carbonation reaction becomes more difficult to progress toward the inner layer,
In the inner layer portion, the carbonic acid curing reaction was not sufficiently performed.
【０００７】また、カルシウム成形体がその原料特性や
成形方法によって比較的高い含水状態、すなわち成形体
の空隙中における水分の占める容積率が高い状態である
と、成形体の表層部に近い部分であっても、炭酸ガスが
進行することができなくなる。この結果、成形体内層部
が全く炭酸化されていない状況も発生していた。特に、
押し出し成形、抄造成形等の圧縮成形は、一般に水が多
量に添加されて高い含水状態における成形方法であるた
め、この問題が顕著であった。Further, if the calcium compact is in a relatively high water-containing state due to its raw material properties and molding method, that is, in a state in which the volume ratio of water in the voids of the compact is high, the portion near the surface layer of the compact may be formed. Even if it does, carbon dioxide gas cannot proceed. As a result, there has been a situation in which the inner layer of the molded body is not carbonated at all. In particular,
This problem is remarkable because compression molding such as extrusion molding and papermaking molding is a molding method in which a large amount of water is added and a high water content is generally used.
【０００８】このように、成形体の内層部まで均一に炭
酸化されていないと、得られた炭酸硬化体の内層部と外
層部とで組織構造が異なってしまうため、乾燥収縮率が
内・外層部で異なったり、内層部が炭酸硬化していない
ために曲げ強度不足となったりして、炭酸硬化体に亀
裂、割れ等を発生させる原因となっていた。[0008] As described above, if the inner layer portion of the molded article is not uniformly carbonated, the structure of the inner layer portion and the outer layer portion of the obtained carbonated cured product are different from each other. The outer layer portion differs, or the inner layer portion is not carbonated and hardened, resulting in insufficient bending strength, which causes cracks and cracks in the carbonated cured product.
【０００９】そこで、本発明の目的は上記問題点をなく
し、カルシウム系成形体を炭酸化養生して、その内層部
まで均一に炭酸化させる炭酸硬化体の製造方法を提供す
ることにある。Accordingly, an object of the present invention is to eliminate the above-mentioned problems and to provide a method for producing a hardened carbonic material in which a calcium-based molded body is carbonated and cured, and the inner layer portion is uniformly carbonated.
【００１０】[0010]
【課題を解決するための手段】本発明は、前記課題を解
決するために、水酸化カルシウムおよび／または珪酸カ
ルシウム系の粉体を成形したカルシウム系成形体を、炭
酸ガス中で炭酸化養生して硬化体を形成する炭酸硬化体
の製造方法において、前記カルシウム系成形体の空隙中
の水分が占める容積率を、その内層部に比べて外層部で
は低下させて炭酸化養生する炭酸硬化体の製造方法とし
た。また、前記内層部は前記カルシウム系成形体の中心
部から４０〜６０％の体積を占める部分であって、該内
層部の空隙中の水分が占める容積率を５％以上とし、さ
らにその容積率の５〜９０％を前記外層部の水分が占め
る容積率とすることにより、さらに好ましい炭酸硬化体
が得られる製造方法とした。ここで、「空隙中の水分が
占める容積率」とは、空隙の容積と、その空隙中に含ま
れている水分の容積との比率とする。また、「カルシウ
ム系成形体の中心部から４０〜６０％の体積を占める部
分」とは、その成形体の中心から成形体を構成する母材
と空隙とを含んだ体積が成形体全体の体積（同前）の４
０〜６０％である部分とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a calcium-based compact formed by molding calcium hydroxide and / or calcium silicate-based powder in a carbon dioxide gas. In the method for producing a cured carbonic acid body, the volume ratio occupied by the moisture in the voids of the calcium-based molded body is reduced in the outer layer portion compared to the inner layer portion of the carbonated cured material. The manufacturing method was adopted. Further, the inner layer portion is a portion occupying 40 to 60% of the volume from the center of the calcium-based molded body, and the volume ratio of water in the voids of the inner layer portion is set to 5% or more, and the volume ratio is further increased. Is set to 5 to 90% of the volume ratio occupied by the water in the outer layer portion, thereby obtaining a more preferable cured carbonic acid product. Here, the “volume ratio occupied by the moisture in the gap” is defined as a ratio between the volume of the gap and the volume of the moisture contained in the gap. The “portion occupying 40 to 60% of the volume from the center of the calcium-based molded body” is defined as the volume including the base material and the voids constituting the molded body from the center of the molded body. (Same as above) 4
The portion is 0 to 60%.
【００１１】[0011]
【発明の実施の形態】本発明は、水酸化カルシウムおよ
び／または珪酸カルシウム系の粉体を成形したカルシウ
ム系成形体から炭酸硬化体を製造する際に、成形体の空
隙中の水分が占める容積率をその内層部に比べて外層部
では低下させて炭酸化養生する製造方法である。BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to the volume occupied by water in the voids of a compact when producing a carbonated cured product from a calcium-based compact formed from calcium hydroxide and / or calcium silicate-based powder. This is a production method in which the rate is reduced in the outer layer portion compared to the inner layer portion and carbonation curing is performed.
【００１２】カルシウム系成形体を炭酸ガス中で炭酸化
養生する際に、その内層部に比べて外層部での空隙中の
水分が占める容積率を低下させることにより、成形体の
炭酸化の初期段階から、外層部と内層部との炭酸化反応
をほぼ同時に進行させることが可能となる。その理由
は、 １）外層部での空隙中の水分による炭酸ガスの進行が妨
げられ難くなり、炭酸ガスが内層部にまで容易かつ十分
に到達、供給されるようになる。 ２）外層部の水分（溶媒）が少ないため、従来とは違っ
て、炭酸化の初期段階における外層部の炭酸化反応が活
発に起こらない。これにより、炭酸ガスの進行を妨げる
次の２つの阻害要因を押さえることが可能となる。 ａ）成形体表面層におけるシリカの隙間を埋める緻密な
炭酸カルシウムの多量な生成 ｂ）上記炭酸化反応による多量の反応水の生成 さらに、これは外層部の空隙中の水分が占める容積率が
低い状態で維持されていることとなる。 ３）内部層で生成された反応水は、毛管現象により空隙
中の水分の容積率の低い外層部へと順次移動していく。
そして、その水（反応水）は外層部の炭酸化反応を活発
にする溶媒として働くため、成形体の内層部から外層部
に向かって炭酸化が進行するようになる。なお、本発明
において、炭酸化反応は気液境界での反応となるため、
前記溶媒（水）は炭酸ガスあるいはカルシウム成分がそ
の溶媒中に溶解して炭酸化反応を促進させるようにな
る。この際の反応式を下記に示す。 ＣＯ2 ＋２ＯＨ- →Ｈ2Ｏ＋ＣＯ3 - Ｃａ2+＋ＣＯ3 -→ＣａＣＯ3 When the calcium-based compact is subjected to carbonation curing in carbon dioxide gas, the volume ratio of the water in the voids in the outer layer portion is made lower than that in the inner layer portion, so that the initial carbonation of the compact is reduced. From the stage, the carbonation reaction between the outer layer portion and the inner layer portion can proceed almost simultaneously. The reasons are as follows: 1) The progress of the carbon dioxide gas due to the moisture in the voids in the outer layer portion is hardly hindered, and the carbon dioxide gas can easily and sufficiently reach and be supplied to the inner layer portion. 2) Since there is little water (solvent) in the outer layer, the carbonation of the outer layer in the initial stage of carbonation does not actively occur unlike the conventional case. This makes it possible to suppress the following two inhibiting factors that hinder the progress of carbon dioxide gas. a) A large amount of dense calcium carbonate that fills the gaps of silica in the surface layer of the molded body. b) A large amount of reaction water generated by the carbonation reaction. It will be maintained in a state. 3) The reaction water generated in the inner layer sequentially moves to the outer layer portion having a low volume ratio of water in the void due to capillary action.
Then, the water (reaction water) acts as a solvent that activates the carbonation reaction of the outer layer, so that the carbonation proceeds from the inner layer to the outer layer of the molded article. In the present invention, since the carbonation reaction is a reaction at the gas-liquid boundary,
In the solvent (water), a carbon dioxide gas or a calcium component is dissolved in the solvent to promote the carbonation reaction. The reaction formula at this time is shown below. CO 2 + 2OH - → H 2 O + CO 3 - Ca 2+ + CO 3 - → CaCO 3
【００１３】以上より、成形体の炭酸化養生の経過によ
って発生していた内層部への炭酸ガスを供給する阻害要
因等がなくなり、炭酸ガスが内層部にまで十分に供給さ
れて成形体の外層部および内層部が均一に炭酸化した硬
化体が生成される。これにより、表面に亀裂が発生し難
いとともに、曲げ強度が向上した炭酸硬化体を得ること
が可能となる。[0013] As described above, the obstruction factor for supplying carbon dioxide to the inner layer portion, which is generated due to the progress of carbonation curing of the molded body, is eliminated, and the carbon dioxide gas is sufficiently supplied to the inner layer portion and the outer layer of the molded body is removed. A cured product in which the part and the inner layer part are uniformly carbonated is generated. This makes it possible to obtain a hardened carbonic acid product that is less likely to crack on the surface and has improved bending strength.
【００１４】また、カルシウム系成形体の中心部から４
０〜６０％の体積を占める内層部における空隙中の水分
が占める容積率を５％以上とし、その容積率の５〜９０
％を外層部の水分が占める容積率として、炭酸ガス中で
炭酸化養生する。この方法によれば、炭酸ガスの内部層
への進行がより支障なく進み、また、内部層で生成され
た反応水がさらに容易に外層部へ移動するようになる。
その結果、成形体内部がより均一に炭酸化された硬化体
を得ることができるため望ましい。Further, the distance from the center of the calcium-based molded product is
The volume ratio of the water in the void in the inner layer portion occupying 0 to 60% is 5% or more, and the volume ratio of 5 to 90%
% Is defined as the volume ratio occupied by the water in the outer layer portion, and carbonation curing is performed in carbon dioxide gas. According to this method, the progress of the carbon dioxide gas to the inner layer proceeds more smoothly, and the reaction water generated in the inner layer moves more easily to the outer layer.
As a result, a cured product in which the inside of the molded product is more uniformly carbonated can be obtained, which is desirable.
【００１５】ここで、カルシウム系成形体の中心部から
４０％〜６０％の体積を占める部分を内層部とした理由
は、複雑な形状の成形体の場合、内層部と外層部とを明
確に区分けすることが困難であり、また本発明の実施に
おいて内層部と外層部との厳密な区分けは必要としない
ためである。Here, the reason that the portion occupying 40% to 60% of the volume from the central portion of the calcium-based molded product is used as the inner layer portion is that, in the case of a molded product having a complicated shape, the inner layer portion and the outer layer portion are clearly defined. This is because it is difficult to divide, and strict division between the inner layer portion and the outer layer portion is not required in the practice of the present invention.
【００１６】また、内層部の空隙中の水分が占める容積
率が５％以上であると、炭酸化反応に寄与する水（溶
媒）が外層部に十分に供給される状態となる。さらに、
その状態で外層部の空隙中の水分が占める容積率を内層
部の空隙中の水分が占める容積率の５〜９０％以上にす
ると、内層部から移動して加算される水量が外層部の炭
酸化反応に十分な溶媒量となるとともに、その差（内層
部と外層部との空隙中の水分が占める容積率の差）によ
って内層部から外層部への毛管現象がより活発になる。When the volume ratio of water in the voids in the inner layer is 5% or more, water (solvent) contributing to the carbonation reaction is sufficiently supplied to the outer layer. further,
In this state, when the volume ratio occupied by the moisture in the voids in the outer layer portion is set to 5 to 90% or more of the volume ratio occupied by the moisture in the voids in the inner layer portion, the amount of water moved from the inner layer portion and added is reduced by the carbonic acid in the outer layer portion. The amount of the solvent becomes sufficient for the formation reaction, and the difference (difference in the volume ratio occupied by the moisture in the gap between the inner layer portion and the outer layer portion) makes the capillary action from the inner layer portion to the outer layer portion more active.
【００１７】炭酸ガスの濃度は、１％以上であると炭酸
化養生にかかる時間が短縮されるとともに経済的であり
好ましく、１０％以上であると時間がさらに短縮され
て、より望ましい。例えば、セメント工場等のボイラー
等の排気ガス（炭酸ガス）を再使用すると、その濃度は
１０〜４０％であり、炭酸化養生の時間短縮が図られる
とともに経済的でもあり非常に望ましい。When the concentration of carbon dioxide gas is 1% or more, the time required for carbonation curing is shortened and it is economical. When the concentration of carbon dioxide gas is 10% or more, the time is further shortened and more desirable. For example, when exhaust gas (carbon dioxide gas) from a boiler or the like in a cement plant or the like is reused, the concentration thereof is 10 to 40%, which shortens the time for carbonation curing and is economical, which is very desirable.
【００１８】本発明における水酸化カルシウム系の原料
は、消石灰、ドロマイトの焼成物を水和させたものなど
が使用でき、さらに消石灰またはドロマイトを主成分と
する漆喰やドロマイトプラスターの廃材を活用すると経
済的な効果も得られて望ましい。また、珪酸カルシウム
系の原料は、ＣＳＨゲル、トバモライト、ゾノトライト
等が使用できる。さらに、トバモライトまたはゾノトラ
イトを主成分とするＡＬＣやゾノトライト系断熱ボード
の廃材を活用すると、経済的な効果も得られて望まし
い。また、水酸化カルシウムや珪酸カルシウム系の原料
には、モルタル、コンクリート等のカルシウム系水硬性
材料が使用でき、さらにその廃材を活用すると経済的効
果が得られてより好ましい。なお、水酸化カルシウム系
の原料や珪酸カルシウム系の原料は、カルシウム系成形
体の原料として、単独で用いるほか、両者を混合して用
いることもできる。As the calcium hydroxide-based raw material in the present invention, hydrated products of slaked lime and dolomite can be used. Further, it is economical to use waste materials of plaster or dolomite plaster containing slaked lime or dolomite as a main component. It is desirable because it can also provide a positive effect. As the calcium silicate-based raw material, CSH gel, tobermorite, zonotolite and the like can be used. Furthermore, it is desirable to use waste materials of ALC or zonotolite-based heat insulating boards containing tobermorite or zonotolite as a main component, because an economic effect can be obtained. As the calcium hydroxide or calcium silicate-based raw material, a calcium-based hydraulic material such as mortar or concrete can be used, and it is more preferable to use the waste material because an economic effect is obtained. In addition, the calcium hydroxide-based raw material and the calcium silicate-based raw material can be used alone as the raw material of the calcium-based molded body, or can be used by mixing both.
【００１９】本発明におけるカルシウム系成形体の主原
料がＡＬＣ粉体であると、微細な炭酸カルシウムが生成
されるため、比表面積が比較的大きな炭酸硬化体を得る
ことができる。また、この炭酸硬化体は比表面積が大き
いため、調湿材として優れた機能を有する。このように
して得られた調湿材は、同じ体積の他部材のものと比較
して、調湿能力が高く優れている。そのため、例えば室
内、床下、屋根裏等の限られた空間において使用される
場合、限られた使用量で調湿能力を十分に発揮すること
が可能となる。また、その嵩高（体積）をさらに減らし
て所定量当たりの調湿能力を向上させるために、通常は
押出成形によって、板状もしくは小さなペレット状の成
形体が製造される。When the main raw material of the calcium-based molded product of the present invention is ALC powder, fine calcium carbonate is generated, and thus a hardened carbon dioxide having a relatively large specific surface area can be obtained. In addition, since the carbonated product has a large specific surface area, it has an excellent function as a humidity control material. The humidity control material thus obtained has a high humidity control capability and is superior to those of other members having the same volume. Therefore, when used in a limited space such as indoors, under the floor, attic, etc., it is possible to sufficiently exhibit the humidity control ability with a limited amount of use. Further, in order to further reduce the bulk (volume) and improve the humidity control ability per a predetermined amount, a plate-like or small pellet-like molded body is usually produced by extrusion molding.
【００２０】このように押出成形によって成形されて多
量の水を含んだ成形体であっても、本発明の炭酸硬化体
の製造方法を適用することにより、ハンドリングに十分
な強度を備えているとともに、炭酸化によって内層部ま
で炭酸カルシウムが形成されて高い調湿性能を備えた炭
酸硬化体を得ることができる。[0020] Even if a molded article formed by extrusion molding and containing a large amount of water as described above, by applying the method for producing a cured carbonic acid product of the present invention, the molded article has sufficient strength for handling and In addition, calcium carbonate is formed up to the inner layer by carbonation, so that a hardened carbon dioxide having high humidity control performance can be obtained.
【００２１】カルシウム成形体の空隙中の水分が占める
容積率を、成形体の内層部に比べて外層部では低下させ
るには、自然乾燥、熱風受熱乾燥、伝熱受熱乾燥、赤外
線乾燥、高周波乾燥等の方法があり、熱風受熱、伝熱受
熱などが設備、操作性の面で好ましい。また、空隙中の
水分が占める容積率の高い原料を内側とし、それに対す
る空隙中の水分が占める容積率の低い原料を外側として
積層成形させることによっても、本発明における成形体
を得ることはできる。In order to reduce the volume ratio occupied by the moisture in the voids of the calcium compact in the outer layer compared to the inner layer of the compact, natural drying, hot air drying, heat transfer drying, infrared drying, high frequency drying Hot air heat reception, heat transfer heat reception, and the like are preferable in terms of facilities and operability. The molded article of the present invention can also be obtained by laminating a raw material having a high volume ratio occupied by moisture in the voids on the inner side and a raw material having a low volume ratio occupied by moisture in the voids on the outer side. .
【００２２】カルシウム成形体の成形方法としては、押
し出し成形、抄造成形、プレス成形、鋳込み成形、ロー
ル成形等が適用可能である。押し出し成形、抄造成形、
鋳込み成形ロール成形のように、成形時に加水を必要と
して多分な含水状態となるカルシウム成形体の炭酸化養
生において、本発明はその効果を特に発揮する。Extrusion molding, papermaking molding, press molding, casting molding, roll molding and the like can be applied as a molding method of the calcium molded body. Extrusion molding, papermaking molding,
The present invention exerts its effect particularly in the carbonation curing of a calcium molded body that requires water at the time of molding and is likely to be in a water-containing state as in the case of cast molding roll molding.
【００２３】また、水酸化カルシウムおよび／または珪
酸カルシウム系の粉体原料のほかに、成形体内の毛管現
象を妨げない材料を原料として混合することは可能であ
る。例えば、珪砂、雲母、人工軽量骨材等の骨材、およ
び補強繊維や顔料等を混合させても良い。それらの混合
量は、材料の用途や成形方法によっても異なるが、骨材
は６０重量％以下、また、補強繊維と顔料とはそれぞれ
が５重量％以下であることが、硬化体の軽量化、強度ア
ップ、および色彩等の面で好ましい。In addition to the calcium hydroxide and / or calcium silicate-based powder raw material, it is possible to mix a raw material that does not prevent the capillary phenomenon in the molded body. For example, silica sand, mica, aggregates such as artificial lightweight aggregates, and reinforcing fibers and pigments may be mixed. The mixing amount thereof varies depending on the use of the material and the molding method. However, the aggregate is 60% by weight or less, and the reinforcing fiber and the pigment are 5% by weight or less, respectively. It is preferable in terms of increasing strength and color.
【００２４】[0024]
【実施例】以下、本発明の実施例および比較例を説明す
る。 （実施例）珪酸カルシウム系のトバモライト粉末を原料
として、その原料粉体に対し外割で５２％の含水率とな
るように加水してミキサーにて混練し、その混練物を押
し出し成形によって縦１００ｍｍ、横１００ｍｍ、厚さ
１０ｍｍの板状の成形体を得た。EXAMPLES Examples and comparative examples of the present invention will be described below. (Example) A calcium silicate-based tobermorite powder was used as a raw material, and water was added to the raw material powder so as to have a water content of 52% on an external basis and kneaded with a mixer. The kneaded product was extruded to a length of 100 mm. A plate-shaped molded product having a width of 100 mm and a thickness of 10 mm was obtained.
【００２５】そして、その成形体を温度６０℃、湿度３
０％、風速１．５ｍ／ｓの条件で熱風受熱乾燥させて、
成形体内部（内層部、外層部）の空隙中の水分が占める
容積率を、表１中の実施例に示す値に設定した。すなわ
ち、成形体内層部の空隙中の水分が占める容積率を２．
０〜９８．３％にするとともに、空隙中の水分が占める
容積率を外層部は内層部の２．６〜９３．６％と変化さ
せて、成形体をそれぞれ製造した。Then, the molded body is heated at a temperature of 60 ° C. and a humidity of 3 ° C.
0%, hot air receiving heat drying under the condition of wind speed 1.5 m / s,
The volume ratio occupied by the moisture in the voids inside the molded product (inner layer portion, outer layer portion) was set to the value shown in the examples in Table 1. That is, the volume ratio occupied by the moisture in the voids in the layer portion of the molded body is set to 2.
The molded bodies were manufactured by changing the volume ratio occupied by the moisture in the voids to 2.6 to 93.6% of the inner layer portion while setting the volume ratio occupied by the water in the voids to 0 to 98.3%.
【００２６】内層部と外層部との区分け、およびそれら
の空隙中の水分が占める容積率は、次の方法に従った。
形状とその性状が同じとなるように、同じ製造条件のも
とで２つの成形体を得て、その一方を乾燥させて絶乾状
態とする。そして、絶乾状態の成形体と他方とを比較す
ることにより、成形体全体の体積（母材と空隙とを含ん
だ体積）とそこに含まれている水分量、さらに母材の比
重を求める。これらにより、成形体内部の空隙の全容
積、及び空隙中の水分が占める容積率を得ることができ
る。また、他方の成形体を縦８０ｍｍ、横８０ｍｍ、厚
さ８ｍｍとなるように縦横厚み方向から中心に向かって
均等に切り出して内層部（全成形体体積の５１．２％）
とした。そして、これを絶乾状態として内層部に含まれ
ていた水分量、また、その体積と母材の比重から内層部
の空隙の全容積及び空隙中の水分が占める容積率を求め
た。さらに、成形体全体と内層部とにおける水分量及び
空隙の全容積から、外層部の空隙中の水分が占める容積
率を求める。なお、絶乾状態とは、成形体を１０５±５
℃で一定質量になるまで乾燥させた状態を言う。The division of the inner layer portion and the outer layer portion and the volume ratio occupied by moisture in the voids thereof were determined according to the following method.
Two molded bodies are obtained under the same manufacturing conditions so that the shapes and their properties are the same, and one of them is dried to make it completely dry. Then, the volume of the entire molded body (volume including the base material and the voids), the amount of water contained therein, and the specific gravity of the base material are obtained by comparing the completely dried molded body with the other. . Thus, it is possible to obtain the total volume of the voids inside the molded body and the volume ratio occupied by the moisture in the voids. Further, the other molded body is cut out uniformly from the vertical and horizontal thickness directions toward the center so as to have a length of 80 mm, a width of 80 mm, and a thickness of 8 mm, thereby forming an inner layer portion (51.2% of the total molded body volume).
And Then, this was made to be in an absolutely dry state, and the total volume of the voids in the inner layer portion and the volume ratio occupied by the moisture in the voids were determined from the amount of moisture contained in the inner layer portion, and the volume and the specific gravity of the base material. Further, a volume ratio occupied by moisture in the voids in the outer layer portion is determined from the amount of water in the entire molded body and the inner layer portion and the total volume of the voids. In addition, the absolutely dry state means that the molded body is 105 ± 5
This refers to a state of drying at a temperature of ° C. to a constant mass.
【００２７】そして、成形体を容積２０リッターの密閉
容器に入れて、濃度１００％の炭酸ガスを流量２リット
ル／分、２気圧を維持して容器内に送り込み、４８時間
かけて成形体の炭酸化養生を行った。Then, the molded body is placed in a closed container having a capacity of 20 liters, and a carbon dioxide gas having a concentration of 100% is fed into the container at a flow rate of 2 liters / minute while maintaining the pressure at 2 atm. Curing was performed.
【００２８】（比較例）実施例と同様の方法により、成
形体内部（内層部、外層部）の空隙中の水分が占める容
積率を、表１の比較例に示す値に設定した。すなわち、
成形体外層部の空隙中の水分が占める容積率を内層部の
それより大きく設定した条件で成形体をそれぞれ製造
し、さらに、実施例と同様の炭酸化養生によって炭酸硬
化体を得た。表１において、内層部は成形体の中心から
縦８０ｍｍ、横８０ｍｍ、厚さ８ｍｍの部分とした。(Comparative Example) The volume ratio occupied by moisture in the voids inside the molded product (inner layer portion and outer layer portion) was set to the value shown in Comparative Example in Table 1 by the same method as in the example. That is,
The compacts were respectively manufactured under the condition that the volume ratio of the moisture in the voids in the outer layer portion of the compact was larger than that in the inner layer portion, and further, a carbonated cured product was obtained by the same carbonation curing as in the examples. In Table 1, the inner layer portion was a portion having a length of 80 mm, a width of 80 mm, and a thickness of 8 mm from the center of the molded body.
【００２９】以上の実施例及び比較例によって得られた
炭酸硬化体について、その表面に発生した亀裂の状態、
内層部の炭酸化状態、および曲げ強度の結果を表１に示
す。なお、炭酸硬化体の亀裂の発生状態は、硬化体表面
を目視観察することによりその有無を調べた。炭酸化状
態は、硬化体を縦１００ｍｍ、横５０ｍｍ、厚さ１０ｍ
ｍに切断した切断面に、フェノールフタレイン１％のア
ルコール溶液を塗布してその変色の様子を観測した。具
体的には、炭酸化が十分に行なわれて（中性となり）溶
液が無色のまま変化しないか、または炭酸化が不十分で
（アルカリ性のまま）赤紫色に変色するかを観測した。
曲げ強度の測定にあたって、先に半分に切断した硬化体
をさらに長手方向に半分に切断して、横２５ｍｍ縦１０
０ｍｍの試料とした。そして、試料の長手方向（縦）の
互いに８０ｍｍ離れた位置において、直径１０ｍｍの丸
棒を用いて試料下方から２点支持し、その支持間の中央
部を上方から直径１０ｍｍの丸棒を介して試料に加重を
かけた。そして、試料が破壊した時の最大加重を曲げ強
度の値とした。With respect to the carbonic acid cured product obtained by the above Examples and Comparative Examples, the state of cracks generated on the surface,
Table 1 shows the results of the carbonation state of the inner layer and the bending strength. The presence or absence of cracks in the cured carbonic acid was examined by visually observing the surface of the cured product. As for the carbonation state, the cured product is 100 mm long, 50 mm wide, and 10 m thick.
A 1% alcohol solution of phenolphthalein was applied to the cut surface cut into m, and the discoloration was observed. Specifically, it was observed whether the carbonation was sufficiently performed (neutral) and the solution remained colorless, or the carbonation was insufficient (alkaline) and turned red-purple.
In measuring the bending strength, the cured body previously cut in half was further cut in half in the longitudinal direction, and the width was 25 mm and the length was 10 mm.
A sample of 0 mm was used. Then, at a position 80 mm apart from each other in the longitudinal direction (longitudinal direction) of the sample, two points are supported from below the sample using a round bar having a diameter of 10 mm, and the center between the supports is supported from above by a round bar having a diameter of 10 mm. The sample was weighted. The maximum load when the sample was broken was defined as the value of the bending strength.
【００３０】[0030]
【表１】 [Table 1]
【００３１】表１の実施例１〜１０に示すように、内層
部の空隙中の水分が占める容積率より外層部の空隙中の
水分が占める容積率を低くして成形体の炭酸化をするこ
とにより、得られた硬化体表面に亀裂が発生しないとと
もに、その曲げ強度を向上させることが可能となった。As shown in Examples 1 to 10 in Table 1, carbonization of the molded product is performed by lowering the volume ratio occupied by the voids in the outer layer than the volume ratio occupied by the voids in the inner layer. As a result, cracks did not occur on the surface of the obtained cured product, and the bending strength thereof could be improved.
【００３２】さらに、実施例２〜６、９、１０において
は、内層部の空隙中の水分が占める容積率を５％以上と
して、かつ、空隙中の水分が占める容積率を外層部では
内層部の５〜９０％としたことにより、より十分な曲げ
強度の硬化体が得られた。また、実施例７、８では、内
層部の空隙中の水分が占める容積率を５％以上として、
かつ、外層部の空隙中の水分が占める容積率を内層部の
水分が占める容積率を５〜９０％の範囲外（実施例７：
２．６％、実施例８：９３．６％）としたが、十分な曲
げ強度の硬化体を得ることができた。なお、フェノール
フタレイン溶液による炭酸化状態の観測では、実施例１
〜１０の炭酸硬化体の切断面はすべて変色することがな
く、内層部まで十分に炭酸化されていることが確認され
た。Further, in Examples 2 to 6, 9 and 10, the volume ratio occupied by the water in the voids in the inner layer portion was set to 5% or more, and the volume ratio occupied by the water content in the voids was increased in the outer layer portion. By setting the content to 5 to 90%, a cured product having more sufficient bending strength was obtained. Further, in Examples 7 and 8, the volume ratio occupied by moisture in the voids in the inner layer portion was set to 5% or more.
Further, the volume ratio occupied by the moisture in the voids in the outer layer portion is out of the range of 5 to 90% by the volume ratio occupied by the moisture in the inner layer portion (Example 7:
2.6%, Example 8: 93.6%), but a cured product having sufficient bending strength could be obtained. In addition, in the observation of the carbonation state using the phenolphthalein solution, Example 1 was used.
It was confirmed that all of the cut surfaces of the carbonated cured products of Nos. To 10 did not discolor, and the inner layer was sufficiently carbonated.
【００３３】なお、比較例１および２では、表１に示す
ように、得られた硬化体の表面に亀裂が発生し、その曲
げ強度も低くなっていた。また、炭酸化状態も切断面の
中央部が赤紫色に変色して、炭酸化の状態が不十分であ
った。In Comparative Examples 1 and 2, as shown in Table 1, cracks occurred on the surface of the obtained cured product, and its bending strength was low. Also, in the carbonation state, the center of the cut surface turned reddish purple, and the carbonation state was insufficient.
【００３４】[0034]
【発明の効果】本発明によれば、成形体内部が均一に炭
酸化された硬化体を製造することができる。これによ
り、表面の亀裂、割れ、欠けの発生が少なくなり、か
つ、曲げ強度が向上した炭酸硬化体を得ることができる
ようになる。また、曲げ強度が向上した炭酸硬化体は、
その取り扱い、運搬も容易となり、建築資材（調湿材
等）への利用も可能となる。According to the present invention, it is possible to produce a cured product in which the inside of the molded product is uniformly carbonated. Thereby, the occurrence of cracks, cracks, and chips on the surface is reduced, and a cured carbon dioxide body having improved bending strength can be obtained. In addition, the carbonated cured body with improved bending strength
Its handling and transportation become easy, and it can be used for building materials (humidity control materials, etc.).
───────────────────────────────────────────────────── フロントページの続き (72)発明者 寺村 敏史 愛知県尾張旭市下井町下井2035番地 株式 会社建材技術研究所内 Ｆターム(参考） 4G012 PB03 PB06 PD03 PE07 RA02 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toshifumi Teramura 2035 Shimoi, Shioi-machi, Owariasahi-shi, Aichi Prefecture F-term in the Building Materials Research Laboratory (reference) 4G012 PB03 PB06 PD03 PE07 RA02
Claims (5)
シウム系の粉体を成形したカルシウム系成形体を、炭酸
ガス中で炭酸化養生して硬化体を形成する炭酸硬化体の
製造方法において、前記カルシウム系成形体の空隙中の
水分が占める容積率を、その内層部に比べて外層部では
低下させて炭酸化養生することを特徴とする炭酸硬化体
の製造方法。1. A process for producing a cured carbonic product, comprising forming a cured product by subjecting a calcium-based molded product obtained by molding a powder of calcium hydroxide and / or calcium silicate to carbonation curing in carbon dioxide gas. A method for producing a cured carbonic material, characterized in that the volume ratio occupied by water in the voids of a system molded body is reduced in an outer layer portion compared to an inner layer portion and carbonation curing is performed.
中心部から４０〜６０％の体積を占める部分であって、
該内層部の空隙中の水分が占める容積率を５％以上と
し、さらにその容積率の５〜９０％を前記外層部の水分
が占める容積率とした請求項１記載の炭酸硬化体の製造
方法。2. The inner layer portion is a portion occupying a volume of 40 to 60% from a central portion of the calcium-based molded body,
2. The method for producing a cured carbonic acid product according to claim 1, wherein the volume ratio occupied by the water in the voids of the inner layer portion is 5% or more, and the volume ratio occupied by the water content of the outer layer portion is 5 to 90%. .
る請求項１または２記載の炭酸硬化体の製造方法。3. The method according to claim 1, wherein the carbon dioxide gas has a concentration of 1% or more.
シウム系水硬性材料の廃材である請求項１ないし３のい
ずれかに記載の炭酸硬化体の製造方法。4. The method for producing a cured carbonic acid product according to claim 1, wherein a main raw material of the calcium-based molded body is waste material of a calcium-based hydraulic material.
ＡＬＣ粉体である請求項１ないし３のいずれかに記載の
炭酸硬化体の製造方法。5. The method for producing a cured carbonic acid product according to claim 1, wherein the main raw material of the calcium-based molded product is an ALC powder.
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|---|---|---|---|
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| JPH11130560A (en) * | 1997-10-24 | 1999-05-18 | Matsushita Electric Works Ltd | Production of hardened cement product |
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| JPS52102331A (en) * | 1976-02-25 | 1977-08-27 | Ibigawa Electric Ind Co Ltd | Production method of waterrproof carbonation curing material |
| JPS63210055A (en) * | 1987-02-27 | 1988-08-31 | 太平洋セメント株式会社 | Carbonation curing process for gamma dilime silicate |
| JPH0725679A (en) * | 1993-03-04 | 1995-01-27 | Onoda Autoclaved Light Weight Concrete Co Ltd | Respective production of carbonation-hardened molded body and precursor thereof and moisture absorbing and desorbing material composed of the same molded body |
| JPH11130560A (en) * | 1997-10-24 | 1999-05-18 | Matsushita Electric Works Ltd | Production of hardened cement product |
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