JP4627935B2 - Conditioning material - Google Patents
Conditioning material Download PDFInfo
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- JP4627935B2 JP4627935B2 JP2001221474A JP2001221474A JP4627935B2 JP 4627935 B2 JP4627935 B2 JP 4627935B2 JP 2001221474 A JP2001221474 A JP 2001221474A JP 2001221474 A JP2001221474 A JP 2001221474A JP 4627935 B2 JP4627935 B2 JP 4627935B2
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- Prior art keywords
- alc
- humidity control
- carbonation
- waste material
- humidity
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Classifications
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- 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
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- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Description
【０００１】
【発明の属する技術分野】
本発明は、建築物解体現場等から発生する炭酸化飽和した軽量気泡コンクリート（以下、ＡＬＣという）廃材を再利用した調湿材に関するものである。
【０００２】
【従来の技術】
一般にＡＬＣは、珪酸質原料として天然の珪石や珪砂と、石灰質原料としての天然原料から直接製造される石灰石やセメントを主原料とし、副原料として石膏の他、オートクレーブ前のＡＬＣ切断屑などの繰り返し原料を添加し、その配合物に水を加えて混合スラリーとし、これらのスラリーを発泡硬化させた後、水蒸気養生することによって得られる。得られたＡＬＣは、所定寸法に切削加工することによって、パネルなどの建築材料などとなる。建築材料としてのＡＬＣパネルは、鉄筋造やＲＣ造などの外壁、屋根、床などの材料として広く用いられる。
【０００３】
ところで、ＡＬＣ製造工場やＡＬＣの建築施工現場、建築物解体現場等からは、ＡＬＣ廃材が多量に発生する。製造工程から発生するＡＬＣ廃材に関しては、上記のように繰り返し原料として再利用しており、バージン原料に対する割合が大きくなると強度低下の原因となるため、添加量が制限されるという問題はあるものの、工程内でのリサイクル化が進んでいる。しかしながら、ＡＬＣ建設施工現場や建築物解体現場からのＡＬＣ廃材に関しては産業廃棄物として処理するだけで、リサイクル化が進んでいない状況である。ＡＬＣ廃材を産業廃棄物として処理するには、多額の費用が必要になるため製品のコストが上昇する。そのためＡＬＣ建設施工現場や建築物解体現場からのＡＬＣ廃材の有効利用が望まれている。
【０００４】
一方、従来からＡＬＣを利用した二次製品が各種知られており、その中でＡＬＣを利用した調湿材としては、以下に記載するものが知られている。ＡＬＣ製造工程で発生する不良品や建築中に発生する端材などを粉砕したＡＬＣの粉末そのものを調湿材とするもの（特開平６−９９０６３号公報等参照）、前記ＡＬＣ粉末を炭酸ガスで炭酸化させることにより生成されるものを調湿材とするもの、さらに前記ＡＬＣ粉末に水等を添加、造粒して、その造粒物を炭酸ガスで炭酸化させた後、乾燥させてなる調湿材（特開平１０−３３９７９号公報等参照）などがある。
【０００５】
【発明が解決しようとする課題】
しかしながら、従来のＡＬＣ粉末そのものを調湿材としたものについては、炭酸化したものと比べ比表面積が小さいため吸放湿量が少なく、また使用中に炭酸化が進行するとトバモライト結晶が反応して水が放出され、調湿材としての機能が低下するという難点がある。
また、ＡＬＣ粉末を炭酸化した調湿材についても、炭酸化によって比表面積は増大するが、粉末であることにより調湿能力が低く、十分な調湿機能が得られない上、ハンドリング時や床等に散布する場合に風で粉末が飛散したりして取り扱い上も不利な面が多かった。
さらに、ＡＬＣ粉末を造粒後に炭酸化、乾燥させた調湿材の場合は、炭酸化により調湿機能は優れているが、炭酸化に多くの手間と時間を要し、製造コストが高くなるという問題があった。
【０００６】
本発明は、これらの問題を解決するためになされたもので、低コストで優れた調湿機能を有する調湿材を提供しようとするものである。
【０００７】
【課題を解決するための手段】
本発明に係る調湿材は、ビルや家屋の建て替え、リフォーム、補修の対象となる建物から発生するＡＬＣ廃材を有効利用するものであり、その要旨は、炭酸化飽和したＡＬＣ廃材からなることを特徴とし、また、炭酸化飽和したＡＬＣ廃材を磁選機などで鉄筋を取り除いた後、それを破砕して得られた粒径３〜３０ｍｍの破砕物からなることを特徴とし、さらに、炭酸化飽和した軽量気泡コンクリート廃材を磁選機などで鉄筋を取り除いた後、それを３ｍｍ以下の大きさに粉砕し、該粉砕物を粒径３〜３０ｍｍに造粒し、乾燥させて得られたものからなることを特徴とするものである。
【０００８】
ここで、ＡＬＣの炭酸化とは、ＡＬＣの主要鉱物であるトバモライトが、炭酸ガスと水分が存在する環境下で、シリカゲルと炭酸カルシウムに分解する反応であり、仕上げ等の施工が適切に施された場合にも、徐々に進行することが知られている。また、炭酸化することによりＡＬＣは収縮し（炭酸化収縮）、さらに炭酸化したＡＬＣは乾燥収縮率が大きくなり、乾燥収縮と湿潤膨張の繰り返しによるひび割れの発生やパネル強度の低下につながることが知られている。それと同時に、ＡＬＣは炭酸化することによって比表面積が増大し、吸放湿量の優れたものとなることも知られている。
【０００９】
【発明の実施の形態】
本発明において使用するＡＬＣは、炭酸化したＡＬＣ廃材であって、炭酸化度が６０％以上のものが好ましい。ＡＬＣの炭酸化の進行と劣化の関係は図１に示すごとく、炭酸化度は経過年数に比例し、５０％までは比例関係で増加し、６０％で飽和することか知られている（特開２０００−２８３８９５号公報等参照）。つまり、炭酸化度が６０％に達すると、耐用年数を超過したと考えられる。このことから、６０％を下回る炭酸化度のＡＬＣ廃材の場合、炭酸化が未飽和のため、さらに炭酸化が進行すると、トバモライト結晶が反応して水が放出され、調湿材としての機能は低いものとなる。したがって、本発明の調湿材としては、炭酸化度が６０％以上のものが好適である。
【００１０】
また、回収したＡＬＣ廃材に含まれる鉄筋は磁選機などで取り除いた後、このＡＬＣ廃材を破砕し、その破砕物の粒径を３〜３０ｍｍとしたのは、３ｍｍ未満ではハンドリング時や床等に散布する場合に風で粉末が飛散し、他方、３０ｍｍを超えると塊状物となり調湿材として適さないためである。したがって、調湿材として用いる場合の粒径としては、取り扱い上にも散布する上でも３〜３０ｍｍが好ましい。
【００１１】
さらに、磁選機などで鉄筋を取り除いたＡＬＣ廃材を３ｍｍ以下の大きさに粉砕した後、該粉砕物を粒径３〜３０ｍｍに造粒したものからなる調湿材の場合の造粒手法としては、半乾式低水分のペレッティングプレス造粒、またはローループレス造粒などの方法が適しており、使用するＡＬＣ粉末の粒径は３ｍｍ以下のものが使用できる。ＡＬＣ粉末の含水率は水添加により１０〜５０％に調整するのが好ましい。また場合によっては澱粉質や糖蜜などのバインダーを添加してもかまわない。
【００１２】
造粒して得られる調湿材、あるいは破砕して得られる調湿材は、所定の粒径であれば、形状が歪んであっても構わない。
【００１３】
このようにＡＬＣ廃材、ＡＬＣ廃材を破砕あるいは造粒したものを調湿材に用いることで、建築廃材の有効利用がはかられ、環境上も好ましいという優れた効果が得られるのみならず、利用するＡＬＣ廃材は、前記したごとく良好な調湿性能をすでに有しているので、あらためて炭酸化処理を施す必要がなく、そのまま利用できる利点もある。
【００１４】
【実施例】
表１に示す炭酸化度、形状およびかさ比重のＡＬＣ廃材の調湿性能を調べた。
調湿性能は、恒温恒湿槽の中に試料を静置して重量変化を調べることによって評価した。その時の試験条件は、温度２０℃一定、４０％ＲＨ状態から１時間で８０％ＲＨまで増湿し、８０％ＲＨにて１１時間保持した後、１時間で４０％ＲＨに湿度を落とし、４０％ＲＨに１１時間保持し、これを２回繰り返した。その結果は水分の増加減少量を質量％にて図２に示す。
図２の結果より明らかなごとく、本発明例１の調湿材は、良好な値を示したのに対し、炭酸化度が６０％未満の調湿材（比較例１．２．３）の場合は、調湿性能が劣っている。なお、比較例４は、質量当たりで換算すると、本発明例１の９割程度の吸放出特性を示したが、カサ比重が大きく低いため、散布した場合を考えると体積当たりでは、極めて調湿効率が悪いといえる。なお、ここでは本発明例１のみの結果を示したが、残りの本発明例２．３についても同様の結果が得られることはいうまでもない。
【００１５】
【表１】
【発明の効果】
以上説明したごとく、本発明の調湿材は、すでに炭酸化飽和したＡＬＣ廃材を原料とするため、建築廃材の有効利用がはかられ、環境上も好ましいという優れた効果が得られるのみならず、利用するＡＬＣ廃材は、良好な調湿性能をすでに有しているので、あらためて炭酸化処理を施す必要がなく、そのまま利用できる利点があり、従来の調湿材に比べ製造コストも安価につく。また、ＡＬＣと調湿性能が大きく異なる天然素材を組み合わせることにより、吸放出特性を制御・向上させたＡＬＣ基の複合調湿材を提供することも可能である。
【図面の簡単な説明】
【図１】ＡＬＣの炭酸化の進行と劣化の関係を示す図である。
【図２】本発明の実施例における調湿材の調湿性能を示す図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a humidity control material that reuses carbonated and saturated lightweight cellular concrete (hereinafter referred to as ALC) waste material generated from a building demolition site or the like.
[0002]
[Prior art]
In general, ALC mainly uses natural silica stone and silica sand as siliceous raw materials and limestone and cement directly produced from natural raw materials as calcareous raw materials. It is obtained by adding raw materials, adding water to the blend to form a mixed slurry, foam-curing these slurries, and then curing with water vapor. The obtained ALC is made into a building material such as a panel by cutting into a predetermined dimension. ALC panels as building materials are widely used as materials for outer walls, roofs, floors, etc., such as steel bars and RC structures.
[0003]
By the way, a large amount of ALC waste material is generated from ALC manufacturing factories, ALC building construction sites, building demolition sites, and the like. As for ALC waste material generated from the manufacturing process, it is reused as a repetitive raw material as described above, and when the ratio to the virgin raw material increases, it causes a decrease in strength, but there is a problem that the addition amount is limited, Recycling within the process is progressing. However, ALC waste materials from ALC construction sites and building demolition sites are only treated as industrial waste and are not being recycled. In order to treat ALC waste as industrial waste, a large amount of expense is required, which increases the cost of the product. Therefore, effective use of ALC waste materials from ALC construction sites and building demolition sites is desired.
[0004]
On the other hand, conventionally, various secondary products using ALC are known, and among them, the following are known as humidity control materials using ALC. ALC powder itself obtained by pulverizing defective products generated in the ALC manufacturing process or mill materials generated during construction is used as a humidity control material (see JP-A-6-99063, etc.), and the ALC powder is carbon dioxide. What is produced by carbonation is used as a humidity control material, further water is added to the ALC powder, granulated, and the granulated product is carbonated with carbon dioxide gas and then dried. There is a humidity control material (see JP-A-10-33979).
[0005]
[Problems to be solved by the invention]
However, the conventional ALC powder itself as a humidity control material has a smaller specific surface area than the carbonated one, so the amount of moisture absorbed and released is small, and when the carbonation proceeds during use, the tobermorite crystals react. There is a problem that water is released and the function as a humidity control material is lowered.
In addition, the specific surface area of the humidity control material obtained by carbonizing the ALC powder also increases due to the carbonation. However, since the powder is a powder, the humidity control capability is low, and a sufficient humidity control function cannot be obtained. In the case of spraying, etc., there were many disadvantages in handling because the powder was scattered by the wind.
Furthermore, in the case of a humidity control material obtained by carbonizing and drying ALC powder after granulation, the humidity control function is excellent due to carbonation, but it takes a lot of labor and time for carbonation, and the production cost increases. There was a problem.
[0006]
The present invention has been made to solve these problems, and aims to provide a humidity control material having an excellent humidity control function at low cost.
[0007]
[Means for Solving the Problems]
The humidity control material according to the present invention effectively uses ALC waste generated from a building to be rebuilt, renovated or repaired, and the gist of the humidity control material is that it is composed of ALC waste material saturated with carbonation. It is also characterized in that it consists of a crushed material with a particle size of 3 to 30 mm obtained by removing the rebar from a carbonized and saturated ALC waste material using a magnetic separator, etc. After removing the rebar from the lightweight lightweight concrete waste material with a magnetic separator, etc., it is pulverized to a size of 3 mm or less, and the pulverized product is granulated to a particle size of 3 to 30 mm and dried. It is characterized by this.
[0008]
Here, carbonation of ALC is a reaction in which tobermorite, the main mineral of ALC, decomposes into silica gel and calcium carbonate in an environment where carbon dioxide and moisture are present. In this case, it is known to progress gradually. Carbonation causes ALC to shrink (carbonation shrinkage). Carbonated ALC also increases the drying shrinkage rate, which can lead to cracking and panel strength reduction due to repeated drying shrinkage and wet expansion. Are known. At the same time, it is known that ALC increases in specific surface area by carbonation and has an excellent moisture absorption / release amount.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The ALC used in the present invention is a carbonated ALC waste material, preferably having a carbonation degree of 60% or more. As shown in FIG. 1, the relationship between the progress and deterioration of ALC carbonation is known to be proportional to the number of years elapsed, increase up to 50% in a proportional relationship, and saturate at 60%. (See Kai 2000-283895). That is, when the carbonation degree reaches 60%, it is considered that the service life has been exceeded. From this, in the case of ALC waste materials having a carbonation degree of less than 60%, since carbonation is unsaturated, when carbonation proceeds further, tobermorite crystals react to release water, and the function as a humidity control material is It will be low. Therefore, as the humidity control material of the present invention, those having a carbonation degree of 60% or more are suitable.
[0010]
Also, after removing the reinforcing bars contained in the recovered ALC waste material with a magnetic separator, etc., this ALC waste material was crushed and the particle size of the crushed material was 3 to 30 mm. This is because the powder is scattered by the wind when sprayed, and on the other hand, if it exceeds 30 mm, it becomes a lump and is not suitable as a humidity control material. Therefore, the particle size when used as a humidity control material is preferably 3 to 30 mm for both handling and application.
[0011]
Furthermore, as a granulation method in the case of a humidity control material comprising an ALC waste material from which reinforcing bars have been removed with a magnetic separator or the like, pulverized to a size of 3 mm or less, and then the pulverized product is granulated to a particle size of 3 to 30 mm A semi-dry type low moisture pelletizing press granulation method or a roll-press granulation method is suitable, and the ALC powder used can have a particle size of 3 mm or less. The water content of the ALC powder is preferably adjusted to 10 to 50% by adding water. In some cases, a binder such as starch or molasses may be added.
[0012]
The humidity conditioning material obtained by granulation or the humidity conditioning material obtained by crushing may have a distorted shape as long as it has a predetermined particle size.
[0013]
In this way, the use of the ALC waste material and the crushed or granulated ALC waste material as the humidity control material makes it possible to effectively use the building waste material, and not only provides an excellent effect that it is environmentally friendly, but also uses it. Since the ALC waste material to be used already has a good humidity control performance as described above, there is an advantage that it can be used as it is without the need for carbonation treatment.
[0014]
【Example】
The humidity control performance of the ALC waste material having the carbonation degree, shape and bulk specific gravity shown in Table 1 was examined.
The humidity control performance was evaluated by leaving the sample in a constant temperature and humidity chamber and examining the change in weight. The test conditions at that time were as follows: the temperature was constant at 20 ° C., the humidity increased from 40% RH to 80% RH in 1 hour, held at 80% RH for 11 hours, and then the humidity was reduced to 40% RH in 1 hour. It was held at% RH for 11 hours and this was repeated twice. The result is shown in FIG.
As is clear from the results of FIG. 2, the humidity control material of Example 1 of the present invention showed good values, whereas the humidity control material having a carbonation degree of less than 60% (Comparative Example 1.2.3). In the case, the humidity control performance is inferior. In addition, Comparative Example 4 showed about 90% of the absorption / release characteristics of Example 1 of the present invention when converted per mass, but because the bulk density is large and low, considering the case of spraying, the humidity control is extremely high per volume. It can be said that efficiency is bad. Although only the result of the present invention example 1 is shown here, it is needless to say that the same result can be obtained for the remaining invention example 2.3.
[0015]
[Table 1]
【The invention's effect】
As described above, since the humidity control material of the present invention uses ALC waste material that has already been saturated with carbonation as a raw material, not only can the excellent use of the building waste material be achieved, but it is also favorable in terms of the environment. Since the ALC waste material used already has good humidity control performance, it does not need to be re-carbonated and has the advantage that it can be used as it is, and the manufacturing cost is low compared to conventional humidity control materials. . It is also possible to provide an ALC-based composite humidity control material with controlled / improved absorption / release characteristics by combining a natural material with a greatly different humidity control performance from ALC.
[Brief description of the drawings]
FIG. 1 is a graph showing the relationship between the progress of carbonation of ALC and its deterioration.
FIG. 2 is a diagram showing humidity control performance of a humidity control material in an example of the present invention.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001221474A JP4627935B2 (en) | 2001-07-23 | 2001-07-23 | Conditioning material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001221474A JP4627935B2 (en) | 2001-07-23 | 2001-07-23 | Conditioning material |
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| Publication Number | Publication Date |
|---|---|
| JP2003033622A JP2003033622A (en) | 2003-02-04 |
| JP4627935B2 true JP4627935B2 (en) | 2011-02-09 |
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|---|---|---|---|
| JP2001221474A Expired - Fee Related JP4627935B2 (en) | 2001-07-23 | 2001-07-23 | Conditioning material |
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| JP (1) | JP4627935B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012082084A (en) * | 2010-10-07 | 2012-04-26 | Asahi Kasei Construction Materials Co Ltd | Humidity conditioning building material and method of manufacturing the same |
| CN102454247A (en) * | 2010-10-21 | 2012-05-16 | 旭化成建材株式会社 | Moisture-adjusting building material and manufacture method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005320202A (en) * | 2004-05-10 | 2005-11-17 | Shimizu Corp | Cement composition using waste concrete fine powder and method of preparing the same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0699063A (en) * | 1992-09-24 | 1994-04-12 | Takeshi Fujiwara | Under-floor humidity conditioning agent |
| JPH1033979A (en) * | 1996-07-19 | 1998-02-10 | Onoda Autoclaved Light Weight Concrete Co Ltd | Method of manufacturing humidity control material |
| JPH1176737A (en) * | 1997-09-04 | 1999-03-23 | Sumitomo Metal Mining Co Ltd | Flexible vessel for housing humidifying material and humidifying method using the same |
| JP2001353418A (en) * | 2000-06-14 | 2001-12-25 | Clion Co Ltd | Porous humidifying material and producing method thereof |
| JP2002004447A (en) * | 2000-06-22 | 2002-01-09 | Clion Co Ltd | Moisture adjusting building material |
| JP2002030735A (en) * | 2000-07-14 | 2002-01-31 | Clion Co Ltd | Moisture-conditioning building material |
-
2001
- 2001-07-23 JP JP2001221474A patent/JP4627935B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0699063A (en) * | 1992-09-24 | 1994-04-12 | Takeshi Fujiwara | Under-floor humidity conditioning agent |
| JPH1033979A (en) * | 1996-07-19 | 1998-02-10 | Onoda Autoclaved Light Weight Concrete Co Ltd | Method of manufacturing humidity control material |
| JPH1176737A (en) * | 1997-09-04 | 1999-03-23 | Sumitomo Metal Mining Co Ltd | Flexible vessel for housing humidifying material and humidifying method using the same |
| JP2001353418A (en) * | 2000-06-14 | 2001-12-25 | Clion Co Ltd | Porous humidifying material and producing method thereof |
| JP2002004447A (en) * | 2000-06-22 | 2002-01-09 | Clion Co Ltd | Moisture adjusting building material |
| JP2002030735A (en) * | 2000-07-14 | 2002-01-31 | Clion Co Ltd | Moisture-conditioning building material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012082084A (en) * | 2010-10-07 | 2012-04-26 | Asahi Kasei Construction Materials Co Ltd | Humidity conditioning building material and method of manufacturing the same |
| CN102454247A (en) * | 2010-10-21 | 2012-05-16 | 旭化成建材株式会社 | Moisture-adjusting building material and manufacture method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003033622A (en) | 2003-02-04 |
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