JPH06271345A - Wooden cement board - Google Patents
Wooden cement boardInfo
- Publication number
- JPH06271345A JPH06271345A JP8558893A JP8558893A JPH06271345A JP H06271345 A JPH06271345 A JP H06271345A JP 8558893 A JP8558893 A JP 8558893A JP 8558893 A JP8558893 A JP 8558893A JP H06271345 A JPH06271345 A JP H06271345A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- wood
- slag
- blast furnace
- furnace slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は木質補強材によって補強
された木質セメント板に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood cement board reinforced with a wood reinforcing material.
【０００２】[0002]
【発明の背景】従来はセメント板の補強材としては石綿
が使用されていたが、石綿微粉末の飛散によって環境汚
染が問題となり、石綿に代わる補強材として木片や木質
繊維が用いられるようになった。しかしながら木質補強
材で補強した木質セメント板は寸法安定性に劣り、乾燥
吸湿の繰返しによって伸縮し亀裂やそり等が起り易いと
云う欠点がある。したがって木質セメント板を外装板と
して用いた場合、釘等で固定していても乾燥時には収縮
して目地開きを生じ、吸水時には伸長して反りを生ずる
おそれがある。BACKGROUND OF THE INVENTION Asbestos has conventionally been used as a reinforcing material for cement boards, but environmental pollution is a problem due to the scattering of asbestos fine powder, and wood chips and wood fibers have come to be used as a reinforcing material in place of asbestos. It was However, a wood cement board reinforced with a wood reinforcing material has poor dimensional stability, and has the drawback that it tends to expand and contract due to repeated drying and moisture absorption, and cracks and warpage easily occur. Therefore, when a wood cement board is used as an exterior board, there is a possibility that even if it is fixed with nails or the like, it contracts during drying to open the joints and expands during water absorption to cause warpage.
【０００３】[0003]
【従来の技術】上記問題点を解決する手段として、従
来、合成樹脂エマルジョンや水溶性高分子等の高分子物
質を木質補強材に含浸させる方法（特開昭６０−２２６
４４８号）、比較的微細な木質補強材と比較的粗大な木
質補強材とを混合して木質セメント板の内部構造を緻密
かつ均質にする方法（特開昭６０−２４６２４８号）等
が提供されている。2. Description of the Related Art As a means for solving the above problems, conventionally, a method of impregnating a wood reinforcing material with a polymeric substance such as a synthetic resin emulsion or a water-soluble polymer (JP-A-60-226).
No. 448), a method of mixing a relatively fine wood reinforcing material and a relatively coarse wood reinforcing material to make the internal structure of the wood cement board dense and homogeneous (JP-A-60-246248). ing.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら高分子物
質を木質補強材に含浸させる方法では、木質補強材の含
水率に相違があると高分子物質の吸着量に大きな影響が
及ぼされ、寸法安定性が大きくばらつくと云う問題点が
ある。こんような問題点を解消するには、木質補強材を
出来るだけ完全に乾燥して高分子物質の吸着量の向上と
均質化を図ることが必要であるが、このような乾燥工程
は煩雑でありかつエネルギーの消費量を増大させるもの
である。However, in the method of impregnating a wood reinforcing material with a polymer material, if the water content of the wood reinforcing material is different, the adsorption amount of the polymer material is greatly affected and the dimensional stability is improved. There is a problem that is greatly varied. In order to eliminate such problems, it is necessary to dry the wood reinforcing material as completely as possible to improve the adsorption amount of the polymer substance and to homogenize it, but such a drying process is complicated. Yes, and increases energy consumption.
【０００５】一方木質補強材の粒度を選別する方法では
木質補強材の粒度を特定範囲に調整することは極めて煩
雑かつ困難であり、例え木質補強材の粒度を特定範囲に
調整したとしても、成形過程で木質補強材が均質になる
よう型枠上に散布してフォーミングすることは非常に困
難である。On the other hand, it is extremely complicated and difficult to adjust the particle size of the wood reinforcing material to a specific range by the method of selecting the particle size of the wood reinforcing material. Even if the particle size of the wood reinforcing material is adjusted to a specific range, molding In the process, it is very difficult to spray the wood reinforcing material on the formwork so as to make it uniform and form it.
【０００６】[0006]
【課題を解決するための手段】本発明は上記従来の課題
を解決するための手段として、木質補強材と、セメント
と、高炉スラグと、石膏とを主体とする混合硬化物から
なり、該高炉スラグの比表面積が４０００cm2 ／g 以上
の微粉末であり、セメントと高炉スラグとの混合比は
１：０．２から１：１重量比の範囲であり、石膏は０〜
５重量％含まれている木質セメント板を提供するもので
ある。Means for Solving the Problems As a means for solving the above-mentioned conventional problems, the present invention comprises a hardened mixture of wood reinforcing material, cement, blast furnace slag, and gypsum. Slag is a fine powder with a specific surface area of 4000 cm 2 / g or more, the mixing ratio of cement and blast furnace slag is in the range of 1: 0.2 to 1: 1 weight ratio, and gypsum is 0
The present invention provides a wood cement board containing 5% by weight.
【０００７】本発明において用いられる木質補強材とし
ては木片、木毛、木質繊維、木質パルプ等、従来の木質
セメント板に用いられる木質補強材と同様なものがあ
る。望ましい木質補強材としては巾０．５〜２mm、長さ
１〜２０mm、アスペクト比（長さ／厚み）２０〜３０の
木片がある。The wood reinforcing material used in the present invention includes wood chips, wood wool, wood fibers, wood pulp, etc., similar to the wood reinforcing materials used in conventional wood cement boards. A preferable wood reinforcing material is a piece of wood having a width of 0.5 to 2 mm, a length of 1 to 20 mm and an aspect ratio (length / thickness) of 20 to 30.
【０００８】本発明において用いられるセメントとして
は、ポルトランドセメント、高炉スラグセメント、シリ
カセメント、フライアッシュセメント、アルミナセメン
ト等が例示される。Examples of the cement used in the present invention include Portland cement, blast furnace slag cement, silica cement, fly ash cement and alumina cement.
【０００９】本発明ではセメントの一部が高炉スラグに
よって置換せられる。本発明に用いられる高炉スラグは
比表面積が４０００cm2 ／g 以上、望ましくは８０００
cm2／g 以下の微粉末であり、セメントと高炉スラグと
の混合比率は１：０．２から１：１重量比の範囲に限定
される。本発明では所望なれば石膏が添加されるが、該
石膏の添加量は０〜５重量％の範囲に設定される。更に
本発明では上記成分以外、所望なればケイ砂、ケイ石
粉、シリカヒューム、シラスバルーン、パーライト、ベ
ントナイト、ケイソウ土等の充填剤を置換してもよい
し、あるいは塩化カルシウム、塩化マグネシウム、硫酸
アルミニウム、アルミン酸ソーダ、水ガラス等のセメン
ト硬化促進剤が添加されてもよい。In the present invention, part of the cement is replaced by blast furnace slag. The blast furnace slag used in the present invention has a specific surface area of 4000 cm 2 / g or more, preferably 8000.
It is a fine powder of cm 2 / g or less, and the mixing ratio of cement and blast furnace slag is limited to the range of 1: 0.2 to 1: 1 weight ratio. In the present invention, gypsum is added if desired, and the amount of gypsum added is set in the range of 0 to 5% by weight. Further, in the present invention, in addition to the above components, silica sand, silica stone powder, silica fume, shirasu balloon, perlite, bentonite, diatomaceous earth and the like may be substituted, or calcium chloride, magnesium chloride, aluminum sulfate. A cement hardening accelerator such as sodium aluminate or water glass may be added.
【００１０】本発明の木質セメント板を製造するには、
通常上記木質補強材を絶乾固形分換算で２０〜３０重量
％、セメント一高炉スラグ混合物を７０〜８０重量％、
更に所望なれば石膏を０〜５重量％、防水剤、硬化促進
剤等を添加し、水を３０〜４０重量％添加混合して湿潤
原料混合物とし、該湿潤原料を型枠上に散布してマット
にフォーミングし、該マットを複数枚積重ねてプレス加
圧した後、圧締して温度６０〜８０℃、相対湿度６０％
RH以上の雰囲気で２４時間加熱養生して硬化させる。硬
化後、得られた積層マットは脱型し、通常５〜７日間自
然養生しかつ乾燥を行ない、木質セメント板を製造す
る。本発明においては通常オートクレーブ養生は必要で
ないが、所望によりオートクレーブ養生を行なってもよ
い。To produce the wood cement board of the present invention,
Usually, the above wood reinforcing material is 20 to 30% by weight in terms of absolute dry solid content, and the cement-blast furnace slag mixture is 70 to 80% by weight,
Further, if desired, gypsum is added in an amount of 0 to 5% by weight, a waterproofing agent, a hardening accelerator and the like, and water is added in an amount of 30 to 40% by weight to form a wet raw material mixture, and the wet raw material is sprayed on a mold. After forming on a mat, stacking a plurality of the mats and press-pressing the mat, the temperature is 60 to 80 ° C. and the relative humidity is 60%.
It is cured by heating for 24 hours in an atmosphere of RH or higher. After curing, the obtained laminated mat is demolded, naturally cured for 5 to 7 days and dried to produce a wood cement board. In the present invention, autoclave curing is not usually required, but autoclave curing may be performed if desired.
【００１１】[0011]
【作用】本発明ではセメントの一部を比表面積が４００
０cm2 ／g 以上の微粉末である高炉スラグに置換する
が、該高炉スラグは水硬性がありセメント使用量を減ら
して養生後の未硬化セメント量を減らし、それによって
木質セメント板の寸法安定性を改良する。したがって本
発明ではオートクレーブ養生は特に必要としなくなる。
しかし高炉スラグの比表面積が４０００cm2 ／g に満た
ない粗大なものは水硬性が充分でない。またセメントと
高炉スラグの混合比が１：０．２重量比に満たない量で
高炉スラグが含まれていても、上記高炉スラグの効果は
顕著ではなく、また１：１重量比を越えた量で高炉スラ
グが含まれていると木質セメント板の強度が低下する。
石膏はセメントおよび高炉スラグの水硬性を促進するも
のであるが、５重量％を越えた量で添加されると寸法安
定性に悪影響を及ぼす。In the present invention, a part of cement has a specific surface area of 400
The blast furnace slag, which is a fine powder of 0 cm 2 / g or more, is substituted, but the blast furnace slag is hydraulic and reduces the amount of cement used to reduce the amount of uncured cement after curing, thereby improving the dimensional stability of the wood cement board. Improve. Therefore, autoclave curing is not particularly required in the present invention.
However, if the specific surface area of the blast furnace slag is less than 4000 cm 2 / g, it is not sufficiently hydraulic. Even if the mixing ratio of cement and blast furnace slag is less than 1: 0.2 by weight, the effect of blast furnace slag is not remarkable, and the amount exceeds 1: 1 by weight. However, if blast furnace slag is included, the strength of the wood cement board will decrease.
Gypsum promotes the hydraulic properties of cement and blast furnace slag, but if added in an amount exceeding 5% by weight, it adversely affects the dimensional stability.
【００１２】[0012]
【実施例】表１に示す組成の混合物を使用して表裏層部
と内層部とを有する本発明の木質セメント板試料である
実施例１〜５および比較試料である比較例１〜４を作成
した。セメントは普通ポルトランドセメント（住友セメ
ント社製）を使用し、木片はチップをフレーカー（パー
ルマン社製）で細片化して平均巾１．３mm、平均長さ１
２mm、平均アスペクト比２４としたものを使用し、高炉
スラグは比表面積４０００cm2 ／g （無印）、６０００
cm2 ／g （＊）、８０００cm2 ／g （＊＊）の三種類を
使用し、セメント硬化促進剤は１重量％の塩化カルシウ
ム（Ｃa Ｃｌ2）を使用した。[Examples] Using the mixture having the composition shown in Table 1, Examples 1 to 5 which are wood cement board samples of the present invention having front and back layers and an inner layer and Comparative Examples 1 to 4 which are comparative samples were prepared. did. As the cement, ordinary Portland cement (Sumitomo Cement Co., Ltd.) is used, and the wood chips are made into chips with flakers (Pearlman Co.), with an average width of 1.3 mm and an average length of 1
The blast furnace slag has a specific surface area of 4000 cm 2 / g (no mark), 6000
cm 2 / g (*), using the three types of 8000cm 2 / g (**), cement curing accelerator was used 1% by weight of calcium chloride (Ca Cl 2).
【００１３】上記各試料について、下型板上に表１に示
す組成の混合物を所定量を散布してマットをフォーミン
グし、得られたマットを三層重ねてプレス成形した後、
その上から上型板を当接し、圧力２０kgf ／cm2 で圧締
し温度６０〜８０℃、相対湿度６０％以上の雰囲気中で
２４時間養生することにより、厚み１２mmの三層構造の
木質セメント板とした。With respect to each of the above samples, a predetermined amount of the mixture having the composition shown in Table 1 was sprayed on the lower template to form a mat, and the obtained mat was laminated with three layers and press-molded.
By contacting the upper mold plate from above, pressing at 20 kgf / cm 2 and curing for 24 hours in an atmosphere at a temperature of 60 to 80 ° C. and a relative humidity of 60% or more, a wood cement of three-layer structure with a thickness of 12 mm It was a plate.
【００１４】[0014]
【表１】 [Table 1]
【００１５】上記各試料について曲げ強度、吸水伸び、
耐凍結融解性能の各試験を行なった。その結果を表２に
示す。Flexural strength, water absorption elongation, and
Each test of freeze-thaw resistance performance was performed. The results are shown in Table 2.
【００１６】[0016]
【表２】 [Table 2]
【００１７】表２において、比較例１は高炉スラグを添
加しない試料。比較例２は高炉スラグを下限値に満たな
い量添加した試料。比較例３は高炉スラグを上限値を越
えた量添加した試料。比較例４は石膏が上限値を越えた
量添加した試料である。表２によれば本発明の試料であ
る実施例１〜５は高炉スラグを添加しない比較例１と同
等な曲げ強度を有するが、寸法安定性、耐凍結融解性能
は比較例１〜４に比して優れている。石膏が上限値を越
えて含まれている比較例４は寸法安定性および耐凍結融
解性能において劣る。In Table 2, Comparative Example 1 is a sample to which blast furnace slag is not added. Comparative Example 2 is a sample to which blast furnace slag is added in an amount less than the lower limit value. Comparative Example 3 is a sample to which blast furnace slag is added in an amount exceeding the upper limit value. Comparative Example 4 is a sample to which gypsum was added in an amount exceeding the upper limit. According to Table 2, Examples 1 to 5 which are samples of the present invention have the same bending strength as Comparative Example 1 in which blast furnace slag is not added, but the dimensional stability and freeze-thaw resistance are higher than those of Comparative Examples 1 to 4. And is excellent. Comparative Example 4 containing gypsum in excess of the upper limit is inferior in dimensional stability and freeze-thaw resistance.
【００１８】[0018]
【発明の効果】したがって、本発明においては煩雑な工
程を経ずして寸法安定性に優れた木質セメント板が提供
される。As described above, the present invention provides a wood cement board having excellent dimensional stability without complicated steps.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年４月２３日[Submission date] April 23, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００４[Correction target item name] 0004
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００４】[0004]
【発明が解決しようとする課題】しかしながら高分子物
質を木質補強材に含浸させる方法では、木質補強材の含
水率に相違があると高分子物質の吸着量に大きな影響が
及ぼされ、寸法安定性が大きくばらつくと云う問題点が
ある。このような問題点を解消するには、木質補強材を
出来るだけ完全に乾燥して高分子物質の吸着量の向上と
均質化を図ることが必要であるが、このような乾燥工程
は煩雑でありかつエネルギーの消費量を増大させるもの
である。However, in the method of impregnating a wood reinforcing material with a polymer material, if the water content of the wood reinforcing material is different, the adsorption amount of the polymer material is greatly affected and the dimensional stability is improved. There is a problem that is greatly varied. To solve the problems such as this is only possible wood reinforcement completely dry it is necessary to improve the homogenization of the adsorption of polymeric materials, such drying step is complicated And increase energy consumption.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 18:26） 2102−4Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C04B 18:26) 2102-4G
Claims (1)
と、石膏とを主体とする混合硬化物からなり、該高炉ス
ラグの比表面積が４０００cm2 ／g 以上の微粉末であ
り、セメントと該高炉スラグとの混合比は１：０．２か
ら１：１重量比の範囲であり、石膏は０〜５重量％含ま
れていることを特徴とする木質セメント板1. A mixture of a wood reinforcing material, cement, blast-furnace slag, and gypsum as a main component, which is a fine powder having a specific surface area of 4000 cm 2 / g or more. A wood cement board characterized in that the mixing ratio with blast furnace slag is in the range of 1: 0.2 to 1: 1 weight ratio, and that gypsum is contained in 0 to 5 weight%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8558893A JPH06271345A (en) | 1993-03-18 | 1993-03-18 | Wooden cement board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8558893A JPH06271345A (en) | 1993-03-18 | 1993-03-18 | Wooden cement board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06271345A true JPH06271345A (en) | 1994-09-27 |
Family
ID=13862979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8558893A Withdrawn JPH06271345A (en) | 1993-03-18 | 1993-03-18 | Wooden cement board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06271345A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0724939U (en) * | 1993-10-10 | 1995-05-12 | 昭人 西 | Concrete moldings |
-
1993
- 1993-03-18 JP JP8558893A patent/JPH06271345A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0724939U (en) * | 1993-10-10 | 1995-05-12 | 昭人 西 | Concrete moldings |
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