JP3992115B2 - Inorganic cured body and method for producing the same - Google Patents
Inorganic cured body and method for producing the same Download PDFInfo
- Publication number
- JP3992115B2 JP3992115B2 JP21047294A JP21047294A JP3992115B2 JP 3992115 B2 JP3992115 B2 JP 3992115B2 JP 21047294 A JP21047294 A JP 21047294A JP 21047294 A JP21047294 A JP 21047294A JP 3992115 B2 JP3992115 B2 JP 3992115B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- glass fiber
- hydration
- cured
- cured 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.)
- Expired - Fee Related
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
Description
【０００１】
【産業上の利用分野】
この発明は、外装材及び内装材のような建築材料、或いはブロック材のような土木材料等として用いられる無機硬化体の製造方法に関するものである。
【０００２】
【従来の技術】
ポルトランドセメントや混合セメントをバインダとして用い、ガラス繊維を補強材としたガラス繊維補強コンクリート（ＧＲＣ）は、強度も高く、靱性に優れており、建築材料や土木材料等として一部利用されてきている。しかし、その使用に際しては、セメントから生じるアルカリ（主としてＣａ（ＯＨ）2 ）によってガラス繊維が侵されて強度及び靱性が低下するという欠点があり、用途はごく制限されたものとなっている。
【０００３】
このため、高価な耐アルカリ性のガラス繊維を用いたり、セメントに炭酸ガスを作用させアルカリを低減することが試みられているが、いずれも長期の使用では、ガラス繊維の劣化が避けられず、十分な改善効果が得られていないのが現状である。
【０００４】
また、低アルカリの硬化体を得るためにスラグの利用が試みられているが、スラグは、そのままの状態、即ち、未水和のスラグは低アルカリであるが炭酸ガスと反応せず炭酸化によって硬化体を得ることができない。従って、スラグとアルカリ刺激材を含む成形体を養生して水和させ硬化体とするか、あるいはスラグを含む成形体を高温におき水和させ硬化体とした後、炭酸ガスを作用させるなどの方法が採られている。
【０００５】
【発明が解決しようとする課題】
しかし、この方法は成形体の養生中にガラス繊維が高いアルカリ下におかれることになり、その間にガラス繊維の劣化が生じて好ましいものでない。また、硬化体とした後に炭酸ガスを作用させることは、硬化体の内部へ炭酸ガスが非常に浸透し難く、炭酸化が極めて不十分なものとなりやすい。このため、炭酸ガスの浸透を容易ならしめるために硬化体の空隙を多くすると高強度のものが得られないなどの欠点がある。
【０００６】
この発明は、硬化体中のアルカリ濃度が低く、耐アルカリ性ガラス繊維の使用は勿論のこと、安価なＥガラス繊維を補強材として使用しても、長期耐久性に優れ、高強度及び高靱性な無機硬化体及びその製造方法を提供するものである。
【０００７】
【課題を解決するための手段】
上述の目的を達成するために、この発明の無機硬化体の製造方法によれば、ガラス繊維を補強材として混入する無機硬化体の製造方法において、ブレーン比表面積１０００〜２００００ｃｍ ２ ／ｇのスラグを、水中若しくは温水中で少なくともＩｇ．Ｌｏｓｓで５重量％以上となるように攪拌混合して水和前処理し、ガラス繊維を混入して成形体とし、該成形体に炭酸ガスを作用させ硬化させることを特徴とする（請求項１）、又この発明の無機硬化体は、前記請求項１記載の製造方法により製造された無機硬化体である（請求項２）。以下、この発明を詳しく説明する。
【０００８】
まず、ここで使用されるスラグは、いわゆるカルシウム含有スラグであり、カルシウムとして１０％以上含有しているものであれば、特に制限されることなく利用することができ、中でも鉄鋼高炉スラグが好適に使用される。スラグは、後述する水和前処理を効果的に進めるために粉末状のものが良く、ブレーン比表面積１０００〜２００００cm2/g程度のものが好ましい。これが１０００cm2/g以下では炭酸化時の効率が悪く、水和前処理後の再粉砕が必要となり、また、２００００cm2/gをこえて粉砕しても水和前処理を効率的に進める以上に粉砕に要する負担が大きく経済的でない。また、当然のことながら、スラグに砂、砂利等を加え、モルタルまたはコンクリートとして使用することになんら問題はない。
【０００９】
前述したように、スラグは、そのままでは炭酸化することはなく、硬化体を得ることができない。この発明は、スラグを水和前処理し、これを成形体材料として用いる。水和前処理は、スラグを単に水に漬けておくだけでも良いが、温度が２０℃以上の水中若しくは温水中で攪拌混合することが好ましい。水和は水温が高いほど早く進み、また、水和中、スラグを攪拌混合することにより水和を促進すると共にスラグの固結ができないようにすれば、このスラリーを用いて直接成形の用に供することができる。
【００１０】
スラグと水の混合比は、攪拌の便を考慮し重量比でスラグ／水＝５〜０．１の範囲とすることが好ましい。この範囲を外れて水の量が少なくなると攪拌に大きな動力を必要とし、また、水の量が多くなると次工程における炭酸化で脱水量が多くなり非効率となる。尚、スラリーの凝集を防ぐために公知の分散剤を添加しても良く、さらに水和前処理を促進するためにオートクレーブや蒸気を作用させることもできる。
【００１１】
上述したスラグの水和前処理は、Ｉｇ．Ｌｏｓｓ（強熱減量、１００℃〜７００℃の加熱による重量減少率）で５重量％以上となるまで行う。Ｉｇ．Ｌｏｓｓは、スラグの水和率、すなわち、炭酸化可能度を端的に、しかも精度良く現すもので、これを５重量％以上とすることで、効果的に炭酸化硬化体を得ることができる。
【００１２】
次に、水和前処理したスラグを用い、これに所望により砂、砂利、ガラス繊維等を混合して成形体を作る。成形は、公知のプレミックス法、スプレーサクション法、ダイレクトスプレー法等がいずれも採用できるが、多孔質板上で成形することにより効果的な脱水が行われる。補強材として混合するガラス繊維は、耐アルカリ性ガラス繊維を使用することにより飛躍的にその耐久性を上げることができるが、安価なＥガラス繊維を用いても大幅に耐久性を改善することができ、特にガラス繊維の種類を問うことなく使用できる。
【００１３】
次いで、成形体に炭酸ガスを作用させ硬化させる。硬化は、炭酸ガス雰囲気中に成形体を静置する方法、或いは、圧力を利用して炭酸ガスを成形体中に浸透させる方法等があるが、前記多孔質板上の成形体に加圧炭酸ガスを作用させることにより、余剰水の脱水と炭酸化硬化を効率的に行うことができる。炭酸ガスは、高濃度ガスほど効率的に炭酸化を行うことができるが、特に濃度に制限を受けるものではなく、また、炭酸ガスを含有する各種の排気ガスを有効に利用することもできる。
【００１４】
【作用】
水和前処理したスラグを成形体材料とし、炭酸化によって得た硬化体は、アルカリ濃度が低く、耐アルカリ性ガラス繊維の使用は勿論のこと、安価なＥガラス繊維を補強材として使用しても、長期耐久性に優れ、高強度及び高靱性な無機硬化体とすることができる。
【００１５】
【実施例】
粉末度がブレーン値で６０００cm2/gとした鉄鋼高炉スラグ（Ｉｇ．Ｌｏｓｓ、１．０重量％）を、３０℃の温水（水対スラグの重量比２：１）中で７日間攪拌して水和前処理した（Ｉｇ．Ｌｏｓｓ、１０重量％）。次に砂をスラグと同重量添加し、均一に攪拌してモルタルとした。成形は、１辺５０ｃｍ、高さ８０ｃｍの角柱容器の下方から２０ｃｍの位置に布を張った穴空き鉄板を設置し、容器上方からスプレーガンを用いてモルタルを吹き付けると同時に、モルタルの固形分に対し５重量％のガラス繊維をカットしながら吹き付け、穴空き鉄板上に厚さ１０ｍｍの成形体を得た。次いで、容器に蓋をし、成形体に２気圧の炭酸ガスを５分間作用させ、余剰水の脱水と炭酸化硬化を行った。得られた硬化体を２５ｃｍｍ×５ｃｍの大きさに切り分け、７０℃の温水に所定期間浸漬したのち、スパン２０ｃｍの中央点集中載荷式による曲げ試験を行い、強度の変化を測定した。結果を表１に示す。表１には、比較例として、上記水和前処理したスラグの代わりに普通セメントモルタルを用いたものと、炭酸化未処理の普通セメントモルタル（２０℃水中で７日間養生）の例を併せて示す。
【００１６】
【表１】
【発明の効果】
以上、説明したように、この発明によれば、ガラス繊維のアルカリ劣化が防止され、長期耐久性に優れたものとすることができる。[0001]
[Industrial application fields]
The present invention relates to a method for producing an inorganic cured body used as a building material such as an exterior material and an interior material, or a civil engineering material such as a block material.
[0002]
[Prior art]
Glass fiber reinforced concrete (GRC) using Portland cement or mixed cement as a binder and glass fiber as a reinforcing material is high in strength and excellent in toughness, and has been used in part as building materials and civil engineering materials. . However, in its use, there is a disadvantage that the glass fiber is eroded by alkali (mainly Ca (OH) 2 ) generated from the cement and the strength and toughness are lowered, and its use is extremely limited.
[0003]
For this reason, attempts have been made to reduce the alkali by using an expensive alkali-resistant glass fiber or by acting carbon dioxide on cement, but in both cases, deterioration of the glass fiber is inevitable in long-term use. The present situation is that the improvement effect is not obtained.
[0004]
In addition, the use of slag has been attempted in order to obtain a low-alkali cured product, but the slag remains as it is, that is, unhydrated slag is low-alkaline, but does not react with carbon dioxide gas and is carbonized. A cured product cannot be obtained. Therefore, the molded body containing slag and alkali stimulating material is cured and hydrated to obtain a cured body, or the molded body containing slag is hydrated to obtain a cured body, and then carbon dioxide gas is allowed to act. The method is taken.
[0005]
[Problems to be solved by the invention]
However, this method is not preferable because the glass fiber is placed under a high alkali during the curing of the molded body, and the glass fiber deteriorates during that time. Further, when carbon dioxide gas is allowed to act after forming a cured body, carbon dioxide gas hardly penetrates into the inside of the cured body and carbonation tends to be extremely insufficient. For this reason, there is a drawback that a high-strength material cannot be obtained if the voids of the cured body are increased in order to facilitate the penetration of carbon dioxide gas.
[0006]
This invention has a low alkali concentration in the cured product, and it is excellent in long-term durability, high strength, and high toughness even when inexpensive glass fiber is used as a reinforcing material as well as the use of alkali-resistant glass fiber. An inorganic cured body and a method for producing the same are provided.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object , according to the method for producing an inorganic cured body of the present invention, in the method for producing an inorganic cured body in which glass fibers are mixed as a reinforcing material, a slag having a Blaine specific surface area of 1000 to 20000 cm 2 / g is used. , At least Ig. The mixture is stirred and mixed so as to be 5% by weight or more with Loss, pretreated by hydration, mixed with glass fiber to form a molded body, and carbon dioxide gas is allowed to act on the molded body to cure. In addition, the inorganic cured body of the present invention is an inorganic cured body manufactured by the manufacturing method according to claim 1 (claim 2). Hereinafter, the present invention will be described in detail.
[0008]
First, the slag used here is a so-called calcium-containing slag, and can be used without particular limitation as long as it contains 10% or more as calcium, and steel blast furnace slag is particularly suitable. used. The slag is preferably in the form of a powder in order to effectively proceed with the hydration pretreatment described later, and preferably has a brain specific surface area of about 1000 to 20000 cm 2 / g. If this is less than 1000 cm 2 / g, the efficiency at the time of carbonation is poor, and re-grinding after hydration pretreatment is necessary, and even if pulverization exceeds 20000 cm 2 / g, the hydration pretreatment is effectively advanced. However, the burden required for crushing is large and not economical. As a matter of course, there is no problem in adding sand, gravel or the like to slag and using it as mortar or concrete.
[0009]
As described above, the slag is not carbonated as it is, and a cured product cannot be obtained. In the present invention, slag is pre-hydrated and used as a molding material. In the hydration pretreatment, slag may be simply immersed in water, but it is preferable to stir and mix in water at a temperature of 20 ° C. or higher or warm water. Hydration proceeds faster as the water temperature rises, and during hydration, if slag is stirred and mixed to promote hydration and prevent slag from solidifying, this slurry can be used for direct molding. Can be provided.
[0010]
The mixing ratio of slag and water is preferably in the range of slag / water = 5 to 0.1 in terms of weight ratio in consideration of the convenience of stirring. If the amount of water decreases outside this range, a large amount of power is required for stirring, and if the amount of water increases, the amount of dehydration increases due to carbonation in the next step, resulting in inefficiency. A known dispersant may be added in order to prevent the slurry from agglomerating, and an autoclave or steam can be allowed to act to promote the hydration pretreatment.
[0011]
The slag hydration pretreatment described above is the same as that of Ig. It is carried out until Loss (loss on ignition, weight reduction rate by heating at 100 ° C. to 700 ° C.) reaches 5% by weight or more. Ig. Loss expresses the hydration rate of slag, that is, the degree of carbonation in a straightforward and accurate manner. By setting this to 5% by weight or more, a carbonized cured product can be obtained effectively.
[0012]
Next, using slag pretreated by hydration, sand, gravel, glass fiber, etc. are mixed with this as desired to form a molded body. For the molding, any of a known premix method, spray suction method, direct spray method and the like can be adopted, but effective dehydration is performed by molding on a porous plate. Glass fiber to be mixed as a reinforcing material can dramatically improve its durability by using alkali-resistant glass fiber, but it can greatly improve durability even by using inexpensive E glass fiber. In particular, it can be used without questioning the type of glass fiber.
[0013]
Next, carbon dioxide is allowed to act on the molded body to be cured. Curing includes a method of allowing the molded body to stand in a carbon dioxide atmosphere or a method of allowing carbon dioxide gas to penetrate into the molded body using pressure. By allowing the gas to act, the excess water can be efficiently dehydrated and carbonized and cured. Carbon dioxide gas can be carbonized more efficiently as the concentration of the gas increases. However, the concentration is not particularly limited, and various exhaust gases containing carbon dioxide gas can be used effectively.
[0014]
[Action]
The slag pretreated by hydration is used as a molded body material, and the cured product obtained by carbonation has a low alkali concentration, not to mention the use of alkali-resistant glass fibers, but also using inexpensive E glass fibers as a reinforcing material. In addition, an inorganic cured body having excellent long-term durability and high strength and toughness can be obtained.
[0015]
【Example】
A steel blast furnace slag (Ig. Loss, 1.0% by weight) having a fineness of 6000 cm 2 / g as a brane value was stirred in 30 ° C. warm water (water to slag weight ratio 2: 1) for 7 days. Hydration was pretreated (Ig. Loss, 10% by weight). Next, sand was added in the same weight as the slag, and stirred uniformly to obtain a mortar. Molding is done by installing a perforated iron plate with a cloth stretched 20cm from the bottom of a prismatic container with a side of 50cm and a height of 80cm. On the other hand, it was sprayed while cutting 5% by weight of glass fiber to obtain a molded body having a thickness of 10 mm on a perforated iron plate. Next, the container was covered, and carbon dioxide gas of 2 atm was allowed to act on the molded body for 5 minutes to perform dehydration of excess water and carbonation curing. The obtained cured body was cut into a size of 25 cm × 5 cm, immersed in warm water at 70 ° C. for a predetermined period, and then subjected to a bending test by a center point concentrated loading method with a span of 20 cm to measure a change in strength. The results are shown in Table 1. In Table 1, as a comparative example, those using ordinary cement mortar instead of the slag pretreated with hydration and ordinary cement mortar not treated with carbonation (cured in 20 ° C. water for 7 days) are combined. Show.
[0016]
[Table 1]
【The invention's effect】
As described above, according to the present invention, alkali deterioration of glass fibers can be prevented and excellent long-term durability can be achieved.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21047294A JP3992115B2 (en) | 1994-08-11 | 1994-08-11 | Inorganic cured body and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21047294A JP3992115B2 (en) | 1994-08-11 | 1994-08-11 | Inorganic cured body and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0859310A JPH0859310A (en) | 1996-03-05 |
| JP3992115B2 true JP3992115B2 (en) | 2007-10-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21047294A Expired - Fee Related JP3992115B2 (en) | 1994-08-11 | 1994-08-11 | Inorganic cured body and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3992115B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010038503A (en) * | 1999-10-25 | 2001-05-15 | 김수태 | Solidified product of the slag from the electric furnace and the prepatation thereof |
| EP2594336A1 (en) * | 2011-11-21 | 2013-05-22 | Helmut Schirmbrand | Method and device for milling mineral substances and mineral substance |
| CA3136486C (en) * | 2019-04-12 | 2023-01-10 | Carbicrete Inc. | Carbonation curing method to produce wet-cast slag-based concrete products |
| CN113905863A (en) * | 2019-04-12 | 2022-01-07 | 碳化混凝土公司 | Production method of wet casting slag-based concrete product |
-
1994
- 1994-08-11 JP JP21047294A patent/JP3992115B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0859310A (en) | 1996-03-05 |
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