JP2000319074A - Production of lightweight carbonate hardened body - Google Patents
Production of lightweight carbonate hardened bodyInfo
- Publication number
- JP2000319074A JP2000319074A JP11126698A JP12669899A JP2000319074A JP 2000319074 A JP2000319074 A JP 2000319074A JP 11126698 A JP11126698 A JP 11126698A JP 12669899 A JP12669899 A JP 12669899A JP 2000319074 A JP2000319074 A JP 2000319074A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- cured product
- powder
- calcium silicate
- granules
- 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.)
- Pending
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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、軽量性、および断
熱性の高い内装・外装用建築材料、土木資材に適用でき
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 carbonated cured product which can be applied to interior and exterior building materials and civil engineering materials having high lightness and heat insulation.
【０００２】[0002]
【従来の技術】ケイ酸カルシウム化合物を主成分とする
材料を炭酸ガスとの反応によって硬化させて、内装・外
装用建築材料、土木資材等に適用できる材料を得るため
の製造方法が知られている（例えば特開平７―２５６７
９号公報および特開平７―２８４６２８号公報）。2. Description of the Related Art There is known a production method for curing a material mainly composed of a calcium silicate compound by reaction with carbon dioxide to obtain a material applicable to interior / exterior building materials, civil engineering materials and the like. (For example, Japanese Patent Laid-Open No. 7-2567)
9 and JP-A-7-284628).
【０００３】これらの方法は、軽量気泡コンクリートの
粉粒体や廃コンクリートの粉粒体と水との混合物を加圧
成型し、ついで炭酸ガスの雰囲気で反応させ固化させる
ことを特徴とした技術である。[0003] These methods are a technique characterized in that a mixture of water and a granular material of lightweight cellular concrete or a granular material of waste concrete is molded under pressure, and then reacted and solidified in an atmosphere of carbon dioxide gas. is there.
【０００４】[0004]
【発明が解決しようとする課題】以上の公知技術は、ケ
イ酸カルシウム中のカルシウムが炭酸化反応によって炭
酸カルシウムとして粒子間に析出することで固化する反
応を利用したものである。これらの技術においては、建
材として使用可能な強度を得るためには、粉粒体を圧密
して加圧成形することを必須とし、その加圧力は２〜４
０ＭＰａとする必要がある。そのため、この条件で成形
された炭酸硬化体の嵩密度は、粉粒体の種類、粒径、添
加する水分によって影響されるが、７００〜２０００ｋ
ｇ／ｍ3になる。The above-mentioned known technique utilizes a reaction in which calcium in calcium silicate precipitates as calcium carbonate between particles by a carbonation reaction and solidifies. In these techniques, in order to obtain strength that can be used as a building material, it is essential to compact and press-mold the powder and granules, and the pressing force is 2 to 4 times.
It must be 0 MPa. For this reason, the bulk density of the cured carbonated product formed under these conditions is affected by the type and particle size of the powder and granules, and the added moisture.
g / m 3 .
【０００５】炭酸硬化体を軽量化する方法として、加圧
の際、加圧力を低くすることが考えられるが、その加圧
力を前記範囲以下にすると、建材として必要な強度を保
持することが難しくなる。また、加圧前あるいは加圧中
に泡を混入あるいは発生させる方法は、加圧成型によっ
てその泡が潰れてしまうため有効な方法にはならない。
さらに、前記公報に記載されているような軽量骨材の混
入においても、その骨材自身の強度が低い場合には骨材
が圧壊してその空隙がなくなり、軽量化は困難となる。
一方、強度の高い骨材を用いると重くなり、結果として
軽量化はできない。[0005] As a method of reducing the weight of the carbonated cured product, it is conceivable to reduce the pressing force at the time of pressing, but if the pressing force is less than the above range, it is difficult to maintain the strength required as a building material. Become. Further, a method of mixing or generating bubbles before or during pressurization is not an effective method because the bubbles are crushed by pressure molding.
Further, even when a lightweight aggregate is mixed as described in the above-mentioned publication, if the strength of the aggregate itself is low, the aggregate is crushed and the voids disappear, and it is difficult to reduce the weight.
On the other hand, if a high-strength aggregate is used, the weight increases, and as a result, the weight cannot be reduced.
【０００６】そこで、本発明の課題は、ケイ酸カルシウ
ム化合物を主成分とする粉粒体から得られる炭酸硬化体
の製法において、その硬化体の強度をあまり低下させる
ことなく、しかも断熱性能がすぐれ、より軽量化された
硬化体を得ることができ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 provide a method for producing a cured carbonic acid product obtained from a granular material containing a calcium silicate compound as a main component without significantly lowering the strength of the cured product and having excellent heat insulating performance. It is another object of the present invention to provide a method for producing a cured carbonated product that can obtain a lighter cured product.
【０００７】[0007]
【課題を解決するための手段】かかる課題を解決するた
めに、本発明は、ケイ酸カルシウム化合物を主成分とす
る粉粒体に固体炭酸粒体を混合し、加圧成形することに
よって前記粉粒体を硬化せしめる軽量炭酸硬化体の製造
方法を採用する。In order to solve the above-mentioned problems, the present invention relates to a method of mixing a powder containing a calcium silicate compound as a main component with a solid carbon dioxide, and subjecting the powder to compaction. A method for producing a lightweight carbonic acid cured product that cures the granules is employed.
【０００８】以下、本発明の作用を説明する。先ず、ケ
イ酸カルシウム化合物の炭酸硬化機構について述べる。
ケイ酸カルシウム化合物は、水の存在下で炭酸ガスと接
触するとカルシウムイオンを放出し、水に溶けた炭酸イ
オンと結合して炭酸カルシウムを析出する。カルシウム
イオンが放出されたあとには、シリカゲルがもとの形状
をほとんど残した状態で存在する。炭酸カルシウムの析
出は、ケイ酸カルシウムなどの粉粒体や骨材、補強繊
維、顔料等の粒子間隙あるいはシリカゲル同士の空隙に
起こる。この炭酸カルシウムの空隙充填によって固化現
象が起こると解釈されている。Hereinafter, the operation of the present invention will be described. First, the mechanism of carbonic acid curing of a calcium silicate compound will be described.
The calcium silicate compound releases calcium ions when contacted with carbon dioxide gas in the presence of water, and combines with carbonate ions dissolved in water to precipitate calcium carbonate. After the release of the calcium ions, the silica gel remains almost in its original shape. Precipitation of calcium carbonate occurs in gaps between particles of particles such as calcium silicate, aggregates, reinforcing fibers, pigments, and the like, or in gaps between silica gels. It is interpreted that the filling of the voids with calcium carbonate causes a solidification phenomenon.
【０００９】したがって、硬化体の強度発現のために
は、原料となる粉粒体が圧密された状態で炭酸化させる
必要がある。しかし、粉粒体の圧密化は、炭酸ガスの硬
化体内部への浸透を妨げてしまう。さらに空隙に炭酸カ
ルシウムが充填されることによってさらに浸透が行われ
にくくなってしまう。[0009] Therefore, in order to develop the strength of the cured product, it is necessary to carbonate the powdery material as a raw material in a compacted state. However, the compaction of the granules hinders the penetration of carbon dioxide gas into the inside of the cured product. Further, by filling the voids with calcium carbonate, it becomes more difficult to infiltrate.
【００１０】これに対し、本発明では、固体炭酸（ドラ
イアイス）粒体を、ケイ酸カルシウム化合物を主成分と
する粉粒体と混合することによって、成形後、固体炭酸
粒体の昇華によって発生する炭酸ガスが固化反応に効率
的に利用され、消失した固体炭酸粒体の空隙が気泡とな
って炭酸硬化体内に残存する状態となる。その結果、炭
酸硬化体の軽量化が可能となる。On the other hand, in the present invention, solid carbonic acid (dry ice) particles are mixed with powder particles mainly composed of a calcium silicate compound, and are formed by sublimation of the solid carbonic acid particles after molding. The generated carbon dioxide gas is efficiently used for the solidification reaction, and the voids of the eliminated solid carbon particles become bubbles and remain in the hardened carbon dioxide body. As a result, it is possible to reduce the weight of the carbonated cured product.
【００１１】なお、軽量炭酸硬化体の軽量化のために
は、加圧成形後の混合成形物体積に対して１０〜６０容
量％に相当する固体炭酸粒体を混合するのが好ましい。
１０容量％未満では硬化体の軽量化が望めず、６０容量
％を超えると固体炭酸粒体の昇華によってできた気泡同
士の連結が多くなり、強度的に低下するためである。In order to reduce the weight of the light-weight carbonized cured product, it is preferable to mix solid carbonic acid particles equivalent to 10 to 60% by volume with respect to the volume of the mixed molded product after pressure molding.
If it is less than 10% by volume, it is not possible to reduce the weight of the cured product, and if it exceeds 60% by volume, the number of connected bubbles formed by sublimation of the solid carbon particles increases, and the strength decreases.
【００１２】次に、本発明に好適なケイ酸カルシウム化
合物は、セメントの主水和反応物である非晶質のケイ酸
カルシウム水和物（ＣＳＨ）、トバモライト、ゾノトラ
イト、ウォラストナイト、フォシャジャイト、セメント
鉱物のうち１種あるいは２種以上の成分の化合物であ
る。Next, calcium silicate compounds suitable for the present invention include amorphous calcium silicate hydrate (CSH), which is a main hydration product of cement, tobermorite, zonotolite, wollastonite, and fossia. It is a compound of one or more of the components of jaite and cement minerals.
【００１３】そして、これらの化合物の粉粒体として、
セメントサイジング板及びセメント押出し板等のセメン
ト二次製品、軽量気泡コンクリート及びケイカル板等の
ケイ酸カルシウム製品、コンクリート硬化体、セメント
モルタル硬化体、セメントペースト硬化体並びに生コン
スラッジ硬化体の粉粒体、さらにポルトランドセメン
ト、γ−Ｃ2Ｓが挙げられ、これらのいずれか１種ある
いは２種以上の混合物が利用できる。[0013] As a powder of these compounds,
Cement secondary products such as cement sizing boards and cement extruded boards, calcium silicate products such as lightweight cellular concrete and caical boards, hardened concrete, hardened cement mortar, hardened cement paste and powdered granules of hardened raw consludge, Further, Portland cement and γ-C 2 S are mentioned, and any one or a mixture of two or more thereof can be used.
【００１４】特に粉粒体として、前記セメント二次製
品、ケイ酸カルシウム製品、コンクリート硬化体、セメ
ントモルタル硬化体及びセメントペースト硬化体の廃
材、並びに生コンスラッジ硬化体から選ばれる少なくと
も１種又は２種以上の混合物からなる粉粒体を使用すれ
ば、廃材をリサイクルして使用するため、省資源及び環
境に配慮した炭酸硬化体の製造方法となる。ただし、前
記廃材や生コンスラッジ硬化体を使用する場合には、そ
れらが本発明の製造に供する前に極度に炭酸化していな
いことが重要である。In particular, at least one or two selected from the above-mentioned cement secondary products, calcium silicate products, hardened concrete, hardened cement mortar and hardened cement paste, and hardened raw sludge are preferably used as powders and granules. The use of the powdery granules made of the above mixture results in a method for producing a cured carbonated material that is resource-saving and environmentally friendly because the waste material is recycled and used. However, in the case of using the waste material and the cured raw sludge, it is important that they are not extremely carbonated before being subjected to the production of the present invention.
【００１５】炭酸化は、材料の強度を増加するために必
要な反応である。したがって、できる限り含有するケイ
酸カルシウムを炭酸化させ、前記粒子間のバインダーと
して有用に機能させるのが望ましい。そのためには、前
記粉粒体にはケイ酸カルシウム化合物が３０重量％以上
含まれていることが望ましく、また、ケイ酸カルシウム
化合物中のカルシウム成分を酸化カルシウム換算で１０
重量％以上とすることが望ましい。さらに、後述する炭
酸化反応によってケイ酸カルシウム化合物のうち７０％
以上が炭酸化されていることが望ましい。[0015] Carbonation is a necessary reaction to increase the strength of the material. Therefore, it is desirable that the calcium silicate contained as much as possible be carbonated and usefully function as a binder between the particles. For this purpose, it is desirable that the powdery granules contain a calcium silicate compound in an amount of 30% by weight or more, and the calcium component in the calcium silicate compound is reduced to 10% in terms of calcium oxide.
It is desirable that the content be not less than weight%. Further, 70% of the calcium silicate compound is obtained by a carbonation reaction described later.
It is desirable that the above is carbonated.
【００１６】また、粉粒体の粒径は加圧成型時に圧壊す
るため特に限定はされないが、平均で１μｍ〜５ｍｍが
望ましい。この範囲を超える粒径では、加圧成形が容易
でなくなり、また範囲未満では炭酸化ガスの硬化体内部
への浸透が困難になるためである。The particle size of the granular material is not particularly limited because it is crushed during pressure molding, but it is preferably 1 μm to 5 mm on average. If the particle size exceeds this range, pressure molding becomes difficult, and if it is less than the range, it becomes difficult for the carbonated gas to penetrate into the inside of the cured product.
【００１７】一方、固体炭酸は、破砕または切削により
粒体となして使用するが、その粒径は５０μｍ〜５ｍｍ
が好ましい。この範囲を超える粒径では固体炭酸粒体自
身が圧壊し偏平な空隙を形成してしまい、一方、この範
囲未満では、粉粒体との混合時に昇華によって消失しや
すくなるためである。On the other hand, solid carbonic acid is used as granules by crushing or cutting, and the particle size is 50 μm to 5 mm.
Is preferred. If the particle size exceeds this range, the solid carbon dioxide particles themselves are crushed to form flat voids, whereas if it is less than this range, the particles tend to disappear by sublimation during mixing with the powder particles.
【００１８】必要な二酸化炭素は、完全に炭酸化させる
場合、粉粒体に含まれるケイ酸カルシウム化合物のカル
シウム成分を酸化カルシウム換算でＡ重量％とすると、
Ａ×４４／５６重量％、すなわち約０．８Ａ重量％の二
酸化炭素が理論的に必要となる。ただし、この必要量分
以上を固体炭酸粒体として本発明の製造方法で使用する
ことも可能であるし、またこの必要量分以下の固体炭酸
粒体を混合してもよい。後者の場合には、成形後、炭酸
ガスの高濃度雰囲気で養生し炭酸化反応を補うことが望
ましい。When the required carbon dioxide is completely carbonated, if the calcium component of the calcium silicate compound contained in the granules is A weight% in terms of calcium oxide,
A.times.44 / 56% by weight, or about 0.8 A weight% of carbon dioxide is theoretically required. However, it is also possible to use the required amount or more as solid carbon particles in the production method of the present invention, or to mix solid carbon particles in the required amount or less. In the latter case, after molding, it is desirable to cure in a high concentration atmosphere of carbon dioxide gas to supplement the carbonation reaction.
【００１９】粉粒体と固体炭酸粒体の混合方法について
は、本発明では限定されるものでないが、可能な限り素
早く混合する必要がある。これは、混合中に固体炭酸粒
体の昇華によって粉粒体の炭酸化が進行してしまうため
である。The method of mixing the granules and the solid carbonic particles is not limited in the present invention, but it is necessary to mix them as quickly as possible. This is because during the mixing, the carbonation of the granules proceeds due to the sublimation of the solid carbon granules.
【００２０】混合に際しては、炭酸反応に影響しない補
強繊維、骨材、顔料等も同時に添加することもできる。
また、反応に必要な水分は固体炭酸粒体との混合の前に
予め粉粒体に混合しておいてもよいし、後述するように
加圧成形後、前記粉粒体と前記固体炭酸粒体との混合成
形物に散布してもよい。At the time of mixing, reinforcing fibers, aggregates, pigments and the like which do not affect the carbonation reaction can be added at the same time.
Further, the water required for the reaction may be previously mixed with the powdered granules before mixing with the solid carbonated granules, or the powdered granules and the solid carbonated granules may be formed after pressure molding as described later. It may be sprayed on a molded article mixed with the body.
【００２１】前者の方法を採用する場合、水の添加量
は、粉粒体の種類、粒径、加圧力によって影響するが、
粉粒体１００重量部に対し３〜６０重量部添加する。例
えば、軽量気泡コンクリート（ＡＬＣ）の粉粒体では３
５〜６０重量部が、ケイカル板の粉粒体では１０〜３０
重量部、コンクリート硬化体の粉粒体では３〜２０重量
部、γ−Ｃ2Ｓでは３〜１５重量部が最適な水の添加量
となる。この範囲未満では、炭酸化反応が十分行われ
ず、また範囲を超えると炭酸反応時に泥しょう化してし
まうためである。水を混合した粉粒体は、固体炭酸粒体
との混合中におこる炭酸反応を極力おさえるために、氷
点下に冷却する方法もある。In the case of employing the former method, the amount of water to be added is influenced by the type, particle size and pressing force of the granular material.
3 to 60 parts by weight is added to 100 parts by weight of the granular material. For example, in the case of light aerated concrete (ALC) powder, 3
5 to 60 parts by weight is 10 to 30 in the powdery granules of the calcical plate.
The optimum amount of water to be added is 3 to 20 parts by weight, 3 to 15 parts by weight of γ-C 2 S, and 3 to 20 parts by weight of the hardened concrete powder. If the amount is less than this range, the carbonation reaction will not be sufficiently performed, and if the amount exceeds the range, the carbonation will occur during the carbonation reaction. There is also a method in which the powder and granules mixed with water are cooled to below freezing in order to minimize the carbonic acid reaction that occurs during the mixing with the solid carbon particles.
【００２２】加圧成形は、プレス成形、押出し成型が適
用できるがプレス成形が好ましい。プレス成形の場合、
粉粒体と固体炭酸粒体の混合物を型枠に入れ加圧する。
このときの加圧力は５〜３０ＭＰａの範囲が望ましい。
加圧速度および型枠温度は、成形材料の保形性に影響す
る。As the pressure molding, press molding and extrusion molding can be applied, but press molding is preferable. In the case of press molding,
The mixture of the powdery granules and the solid carbon dioxide granules is placed in a mold and pressurized.
The pressure at this time is preferably in the range of 5 to 30 MPa.
The pressing speed and the mold temperature influence the shape retention of the molding material.
【００２３】すなわち、加圧速度が極度に遅くかつ型枠
温度が極度に高い場合には、成形中、混合原料中の粉粒
体や固体炭酸粒体等が移動している最中に固体炭酸粒体
の昇華が進み、炭酸化反応が進行してしまうため、硬化
体成形には好ましくない。したがって、加圧速度を早く
し、素早く成形を完了するのが望ましい。That is, when the pressurizing speed is extremely low and the mold temperature is extremely high, the solid carbon dioxide particles are moved during the molding while the powder and the solid carbon particles in the mixed raw material are moving. Since the sublimation of the granules proceeds and the carbonation reaction proceeds, it is not preferable for the formation of a cured product. Therefore, it is desirable to increase the pressing speed and complete the molding quickly.
【００２４】固体炭酸粒体の昇華によって発生する炭酸
ガスは、粉粒体の流動性を増加させる働きがある。成形
時には、この現象によって微細な粉体が硬化体表面へ移
動してくる。その結果、硬化体の表面は緻密な層にな
り、硬化体内部に気泡が存在する形態になる。この一種
のシェル構造は、特に力学的な性質に優れる。The carbon dioxide gas generated by the sublimation of the solid carbon dioxide has the function of increasing the fluidity of the powder. During molding, this phenomenon causes fine powder to move to the surface of the cured product. As a result, the surface of the cured product becomes a dense layer, and has a form in which bubbles exist inside the cured product. This kind of shell structure is particularly excellent in mechanical properties.
【００２５】加圧成形してできた前記混合成形物は、脱
型し氷点以上の雰囲気で静置する。または、養生中に生
じるガス発生に伴う圧力のばらつき、反応に伴う発熱に
よる歪みを解消するため、加圧成形後、そのまま圧力を
保持した状態で反応を進行させる方法も採用できる。The mixed molded product formed by pressure molding is released from the mold and left standing in an atmosphere at a temperature above the freezing point. Alternatively, a method in which the reaction is allowed to proceed while maintaining the pressure as it is after the pressure molding in order to eliminate the variation in pressure due to the generation of gas generated during curing and the distortion due to heat generation due to the reaction.
【００２６】なお、加圧成形時あるいは加圧成型後に、
前記粉粒体と前記固体炭酸粒体との混合成形物に水を散
布して炭酸化反応を促進させる方法や、加圧成形時ある
いは加圧成形後にその混合成形物を加温することによ
り、固体炭酸の昇華を促進させる方法も採用できる。ま
た、本発明によってできた軽量炭酸硬化体は、シリカゲ
ル分を含有するため、原料である粉粒体に対し調湿性能
が付加される。During or after pressure molding,
By spraying water on the mixed molded product of the powder and the solid carbon dioxide to promote the carbonation reaction, or by heating the mixed molded product during or after pressure molding, A method of promoting sublimation of solid carbonic acid can also be adopted. Further, since the light-weight carbonized cured product produced according to the present invention contains a silica gel component, humidity control performance is added to the powdery granules as a raw material.
【００２７】[0027]
【実施例１】軽量気泡コンクリート（ＡＬＣ）の粒径
１．５ｍｍ以下の破砕粉１００重量部に水を４５重量部
混合した。なお、軽量気泡コンクリートは約７０重量％
のケイ酸カルシウム水和物トバモライトを含んでおり、
カルシウムは酸化カルシウム換算で約３３重量％含有し
ている。この混合物に固体炭酸を平均１．０ｍｍに粉砕
した粒体を３０重量部すばやく混合し、１００×１００
ｍｍの型枠に入れ、直ちに２０ＭＰａの圧力で一軸加圧
し成形した。Example 1 45 parts by weight of water was mixed with 100 parts by weight of crushed powder having a particle size of 1.5 mm or less of lightweight cellular concrete (ALC). About 70% by weight of lightweight cellular concrete
Containing calcium silicate hydrate tobermorite,
Calcium contains about 33% by weight in terms of calcium oxide. To this mixture, 30 parts by weight of granules obtained by pulverizing solid carbonic acid to an average of 1.0 mm were quickly mixed, and 100 × 100
mm and immediately uniaxially pressed at a pressure of 20 MPa to form.
【００２８】脱型後、この混合成形物を室温２５℃の密
閉空間に５時間静置し、ついで乾燥し厚さ１２ｍｍの炭
酸硬化体を得た。この炭酸硬化体の嵩密度は７００ｋｇ
／ｍ 3であり、深さ１ｍｍまでの表層部は気泡のない緻
密な層で覆われていて、内部に直径平均１ｍｍの気泡が
存在しておりシェル構造をなしていた。この炭酸硬化体
の破面にフェノールフタレン指示薬をつけて炭酸化の状
況を観察したところ、厚さ方向で赤色化せず、硬化体全
体が炭酸化していることが確認できた。その炭酸硬化体
の強度を３点曲げ試験にて測定したところ３．６ＭＰａ
であった。After demolding, the mixed molded product was compacted at a room temperature of 25 ° C.
Leave it in a closed space for 5 hours, then dry it and dry it with a 12mm thick charcoal.
An acid cured product was obtained. The bulk density of this carbonated cured product is 700 kg
/ M ThreeThe surface layer up to a depth of 1 mm is
It is covered with a dense layer, and bubbles with an average diameter of 1 mm are inside.
It was present and had a shell structure. This carbonated cured body
Phenolphthalene indicator on the fracture surface of
When the condition was observed, the cured product did not turn red in the thickness direction,
It was confirmed that the body was carbonated. The carbonated cured body
Was measured by a three-point bending test to be 3.6 MPa.
Met.
【００２９】[0029]
【比較例１】軽量気泡コンクリート（ＡＬＣ）の粒径
１．５ｍｍ以下の破砕粉１００重量部に水を４５重量部
混合した。なお、軽量気泡コンクリート粉粒体は実施例
１に示した成分と同じものである。この混合物を１００
×１００ｍｍの型枠に入れ、２０ＭＰａの圧力で一軸加
圧し成形した。脱型後、できた成形物を密閉容器に入れ
濃度１００％の炭酸ガスを０．３ＭＰａまで入れ、圧力
を保持しながら２４時間養生した。Comparative Example 1 45 parts by weight of water was mixed with 100 parts by weight of crushed powder having a particle size of 1.5 mm or less of lightweight cellular concrete (ALC). The lightweight cellular concrete granules are the same as the components shown in Example 1. 100 of this mixture
It was placed in a mold having a size of 100 mm and uniaxially pressed at a pressure of 20 MPa to perform molding. After demolding, the formed product was placed in a closed container, and carbon dioxide gas having a concentration of 100% was charged to 0.3 MPa, and the mixture was cured for 24 hours while maintaining the pressure.
【００３０】ついで、乾燥し厚さ１２ｍｍの炭酸硬化体
を得た。この炭酸硬化体の嵩密度は１１６０ｋｇ／ｍ3
であり、曲げ強度は６．１ＭＰａであった。この炭酸硬
化体の破面にフェノールフタレン指示薬をつけて炭酸化
の状況を観察したところ、厚さ方向で赤色化せず、硬化
体全体が炭酸化していることが確認できた。Then, it was dried to obtain a carbonic acid cured product having a thickness of 12 mm. The bulk density of this carbonated cured product is 1160 kg / m 3
And the bending strength was 6.1 MPa. When a phenolphthalene indicator was applied to the fracture surface of the carbonized cured product and the state of carbonation was observed, it was confirmed that the entire cured product was not carbonized in the thickness direction but carbonized.
【００３１】[0031]
【実施例２】まず、普通ポルトランドセメントと細骨材
の重量割合が１：３のセメントモルタルを粉砕し、１．
５ｍｍのフルイを通過させた粉粒体１００重量部に対
し、水を８重量部混合した混合物を用意する。この混合
物１０８重量部に対し、固体炭酸を平均１．０ｍｍに粉
砕した粒体を３０重量部すばやく混合し、１００×１０
０ｍｍの型枠に入れ、直ちに２０ＭＰａの圧力で一軸加
圧し成形した。Example 2 First, a cement mortar having a weight ratio of ordinary Portland cement to fine aggregate of 1: 3 was pulverized.
A mixture is prepared by mixing 8 parts by weight of water with respect to 100 parts by weight of a granular material passed through a 5 mm sieve. To 108 parts by weight of this mixture, 30 parts by weight of granules obtained by pulverizing solid carbonic acid to an average of 1.0 mm were quickly mixed, and 100 × 10
It was placed in a 0 mm formwork and immediately uniaxially pressed at a pressure of 20 MPa to form.
【００３２】脱型後、できた混合成形物を室温２５℃の
密閉空間に５時間静置し、ついで乾燥し厚さ１２ｍｍの
炭酸硬化体を得た。この炭酸硬化体の嵩密度は１１５０
ｋｇ／ｍ3であり、深さ１ｍｍまでの表層部は気泡のな
い緻密な層で覆われており、内部に直径平均１ｍｍの気
泡が存在していてシェル構造をなしていた。この炭酸硬
化体の破面にフェノールフタレン指示薬をつけて炭酸化
の状況を観察したところ、厚さ方向で赤色化せず、硬化
体全体が炭酸化していることが確認できた。この炭酸硬
化体の強度を３点曲げ試験にて測定したところ４．６Ｍ
Ｐａであった。After demolding, the resulting mixed molded product was allowed to stand in a closed space at room temperature of 25 ° C. for 5 hours, and then dried to obtain a 12 mm-thick cured carbonic acid product. The bulk density of this carbonated cured product is 1150
kg / m 3 , and the surface portion up to a depth of 1 mm was covered with a dense layer having no bubbles, and bubbles having an average diameter of 1 mm were present inside to form a shell structure. When a phenolphthalene indicator was applied to the fracture surface of the carbonized cured product and the state of carbonation was observed, it was confirmed that the entire cured product was not carbonized in the thickness direction but carbonized. When the strength of the carbonated cured product was measured by a three-point bending test, it was 4.6 M.
Pa.
【００３３】[0033]
【比較例２】普通ポルトランドセメントと細骨材の重量
割合が１：３のセメントモルタルを粉砕し、１．５ｍｍ
のフルイを通過させた粉粒体１００重量部に対し、水を
８重量部混合した混合物を用意する。この混合物を１０
０×１００ｍｍの型枠に入れ、２０ＭＰａの圧力で一軸
加圧成形した。脱型後、できた成形物を密閉容器に入
れ、濃度１００％、圧力０．３ＭＰａの炭酸ガスで２４
時間養生し、ついで乾燥し厚さ１２ｍｍの炭酸硬化体を
得た。Comparative Example 2 Cement mortar having a weight ratio of ordinary Portland cement to fine aggregate of 1: 3 was crushed to 1.5 mm.
A mixture is prepared by mixing 8 parts by weight of water with respect to 100 parts by weight of the granular material passed through the sieve. This mixture is added to 10
It was placed in a mold frame of 0 × 100 mm and uniaxially pressed at a pressure of 20 MPa. After demolding, the formed product is placed in a closed container and subjected to carbon dioxide gas with a concentration of 100% and a pressure of 0.3 MPa for 24 hours.
After curing for a period of time, the product was dried to obtain a carbonic acid cured product having a thickness of 12 mm.
【００３４】この炭酸硬化体の嵩密度は１５１０ｋｇ／
ｍ3であり、３点曲げ試験にて強度を測定したところ
７．８ＭＰａであった。この炭酸硬化体の破面にフェノ
ールフタレン指示薬をつけて炭酸化の状況を観察したと
ころ、厚さ方向の中心部に厚さ約２mmの赤色化した層が
あり、中央部まで炭酸化していないのが確認できた。[0034] The bulk density of this carbonated cured product is 1510 kg /
m 3 , and the strength was measured by a three-point bending test to be 7.8 MPa. When a phenolphthalene indicator was applied to the fracture surface of the carbonized cured product and the state of carbonation was observed, there was a reddish layer with a thickness of about 2 mm in the center in the thickness direction, and the center was not carbonated. Was confirmed.
【００３５】[0035]
【実施例３】粉粒体としてγ−Ｃ2Ｓの粉末１００重量
部に水１０重量部を予め混合した粉体に、平均１．０ｍ
ｍに粉砕した固体炭酸の粒体を４０重量部すばやく混合
し、径１００ｍｍの円筒状型枠に入れ、直ちに１５ＭＰ
ａの圧力で一軸加圧した。１５ＭＰａまで加圧した後、
プレス変位を固定して３０分保持したまま、固体炭酸粒
体の昇華を終了させた。その後、脱型して炭酸ガス濃度
１００％、温度２５℃、大気圧の雰囲気で追加養生し、
厚さ１５ｍｍの炭酸硬化体を得た。Example 3 A powder obtained by previously mixing 10 parts by weight of water with 100 parts by weight of γ-C 2 S powder as a granular material was added with an average of 1.0 m
m, and quickly mix 40 parts by weight of the solid carbon dioxide granules, put into a cylindrical mold having a diameter of 100 mm, and immediately
Uniaxial pressure was applied at the pressure of a. After pressurizing to 15MPa,
The sublimation of the solid carbon dioxide particles was terminated while the press displacement was fixed and held for 30 minutes. After that, the mold was removed, and additional curing was performed in an atmosphere of carbon dioxide concentration of 100%, temperature of 25 ° C. and atmospheric pressure.
A 15 mm thick carbonic acid cured product was obtained.
【００３６】この炭酸硬化体の嵩密度は１４４０ｋｇ／
ｍ3であった。またこの硬化体の表層部は気泡のない緻
密な層で覆われており、内部に直径平均１ｍｍの気泡が
存在していて一種のシェル構造をなしていた。この炭酸
硬化体の破面にフェノールフタレン指示薬をつけて炭酸
化の状況を観察したところ、厚さ方向で赤色化せず、硬
化体全体が炭酸化していることが確認できた。The bulk density of the carbonic acid cured product is 1440 kg /
m 3 . The surface layer of the cured product was covered with a dense layer having no bubbles, and bubbles having an average diameter of 1 mm existed inside, forming a kind of shell structure. When a phenolphthalene indicator was applied to the fracture surface of the carbonized cured product and the state of carbonation was observed, it was confirmed that the entire cured product was not carbonized in the thickness direction but carbonized.
【００３７】[0037]
【比較例３】γ−Ｃ2Ｓの粉末１００重量部に水１０重
量部を混合した粉粒体を、１００×１００ｍｍの型枠に
入れ、１５ＭＰａの圧力で一軸加圧した。加圧後脱型
し、密閉容器に入れ、濃度１００％の炭酸ガスを０．３
ＭＰａまで入れ、２４時間養生し、厚さ１５ｍｍの炭酸
硬化体を得た。この炭酸硬化体の嵩密度は１８９０ｋｇ
／ｍ3であった。Comparative Example 3 A powder obtained by mixing 100 parts by weight of γ-C 2 S powder with 10 parts by weight of water was placed in a 100 × 100 mm mold, and uniaxially pressed at a pressure of 15 MPa. After pressurizing, remove the mold and put it in a closed container.
It was cured to 24 MPa for 24 hours to obtain a cured carbonic material having a thickness of 15 mm. The bulk density of this carbonated cured product is 1890 kg
/ M 3 .
【００３８】この炭酸硬化体の破面にフェノールフタレ
ン指示薬をつけて炭酸化の状況を観察したところ、厚さ
方向で表層から約４ｍｍの深さから赤色化しており、中
心部では炭酸化が進んでいないことが確認できた。When a phenolphthalene indicator was applied to the fracture surface of the carbonized cured product and the state of carbonation was observed, it turned red at a depth of about 4 mm from the surface in the thickness direction. It has been confirmed that it has not progressed.
【００３９】[0039]
【発明の効果】本発明によれば、ケイ酸カルシウム化合
物を主成分とする粉粒体に混入した固体炭酸粒体によっ
て硬化体中に気泡構造を形成することができるため、軽
量化が図れ、しかも断熱性の面でも優れた硬化成形体を
製造することができる。また、混入した固体炭酸粒体に
よって粉粒体内部から炭酸反応を進行させることがで
き、固化反応を効率的に行うことができる。加えて、シ
ェル構造を構成するため、固体炭酸粒体を混合しないで
製造した炭酸硬化体に比べて、強度もあまり低下しない
軽量炭酸硬化体を製造することが可能となる。According to the present invention, since a bubble structure can be formed in a hardened body by solid carbonic acid granules mixed in a granule mainly composed of a calcium silicate compound, weight reduction can be achieved. In addition, it is possible to produce a cured molded body having excellent heat insulating properties. Further, the carbonic acid reaction can proceed from the inside of the powder and granular material by the mixed solid carbonic acid particles, and the solidification reaction can be efficiently performed. In addition, since the shell structure is formed, it is possible to produce a light-weight carbonized cured product whose strength is not significantly reduced as compared with a carbonated cured product produced without mixing solid carbonic particles.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 稲垣 憲次 愛知県尾張旭市下井町下井2035番地 株式 会社材テクノ研究所内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kenji Inagaki 2035 Shimoi, Shioi-machi, Owariasahi-city, Aichi Pref.
Claims (6)
粒体に固体炭酸粒体を混合し、加圧成形することによっ
て前記粉粒体を硬化せしめることを特徴とする軽量炭酸
硬化体の製造方法。1. A method for producing a light-weight carbonized cured product, comprising mixing a solid carbonic acid granule with a powdery granule containing a calcium silicate compound as a main component, and curing the powdery granule by pressing. Method.
３０重量％以上含まれている請求項１記載の軽量炭酸硬
化体の製造方法。2. The method according to claim 1, wherein the powder contains at least 30% by weight of a calcium silicate compound.
カルシウム製品、コンクリート硬化体、セメントモルタ
ル硬化体及びセメントペースト硬化体の廃材、並びに生
コンスラッジ硬化体から選ばれる少なくとも１種又は２
種以上の混合物である請求項１または２記載の軽量炭酸
硬化体の製造方法。3. The powder or granule is at least one selected from the group consisting of cement secondary products, calcium silicate products, hardened concrete, hardened cement mortar, hardened cement paste, and hardened raw sludge.
3. The method for producing a light-weight carbonized cured product according to claim 1 or 2, which is a mixture of at least one kind.
３〜６０重量部の水を混合したものである請求項１から
３のいずれか１項記載の軽量炭酸硬化体の製造方法。4. The powder or granule is used in an amount of 100 parts by weight.
The method for producing a light-weight cured carbonated product according to any one of claims 1 to 3, wherein 3 to 60 parts by weight of water is mixed.
粒体と前記固体炭酸粒体との混合成形物に水を散布する
請求項１から４のいずれか１項記載の軽量炭酸硬化体の
製造方法。5. The lightweight carbonic curing according to any one of claims 1 to 4, wherein water is sprayed on the mixed molded product of the powdery granules and the solid carbonic granules during or after the pressure molding. How to make the body.
粒体と前記固体炭酸粒体との混合成形物を加温する請求
項１から５のいずれか１項記載の軽量炭酸硬化体の製造
方法。6. The light-weight carbonized cured product according to any one of claims 1 to 5, wherein a mixed molded product of the powder and the solid carbon dioxide is heated during or after pressure molding. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11126698A JP2000319074A (en) | 1999-05-07 | 1999-05-07 | Production of lightweight carbonate hardened body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11126698A JP2000319074A (en) | 1999-05-07 | 1999-05-07 | Production of lightweight carbonate hardened body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000319074A true JP2000319074A (en) | 2000-11-21 |
Family
ID=14941645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11126698A Pending JP2000319074A (en) | 1999-05-07 | 1999-05-07 | Production of lightweight carbonate hardened body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000319074A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100886431B1 (en) | 2008-08-20 | 2009-03-02 | 주식회사 라스아이티에스 | Spot block and manufacturing method thereof |
| CN103556727A (en) * | 2013-10-13 | 2014-02-05 | 许庆华 | Environment-friendly rectorite sound-absorbing board |
| CN103556722A (en) * | 2013-10-13 | 2014-02-05 | 许庆华 | Environmental-friendly pumice acoustic board |
| CN103556731A (en) * | 2013-10-13 | 2014-02-05 | 许庆华 | Environment-friendly shale acoustic board |
| CN115432987A (en) * | 2014-08-04 | 2022-12-06 | 索里迪亚科技公司 | Carbonatable calcium silicate compositions and methods |
-
1999
- 1999-05-07 JP JP11126698A patent/JP2000319074A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100886431B1 (en) | 2008-08-20 | 2009-03-02 | 주식회사 라스아이티에스 | Spot block and manufacturing method thereof |
| CN103556727A (en) * | 2013-10-13 | 2014-02-05 | 许庆华 | Environment-friendly rectorite sound-absorbing board |
| CN103556722A (en) * | 2013-10-13 | 2014-02-05 | 许庆华 | Environmental-friendly pumice acoustic board |
| CN103556731A (en) * | 2013-10-13 | 2014-02-05 | 许庆华 | Environment-friendly shale acoustic board |
| CN115432987A (en) * | 2014-08-04 | 2022-12-06 | 索里迪亚科技公司 | Carbonatable calcium silicate compositions and methods |
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