JPH0216261B2 - - Google Patents
Info
- Publication number
- JPH0216261B2 JPH0216261B2 JP57045645A JP4564582A JPH0216261B2 JP H0216261 B2 JPH0216261 B2 JP H0216261B2 JP 57045645 A JP57045645 A JP 57045645A JP 4564582 A JP4564582 A JP 4564582A JP H0216261 B2 JPH0216261 B2 JP H0216261B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- alumina
- length
- change
- added
- 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 - Lifetime
Links
- 239000004568 cement Substances 0.000 claims description 30
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 13
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000010425 asbestos Substances 0.000 description 7
- 229910052895 riebeckite Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000010454 slate Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- -1 pulp Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical group O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 229910001648 diaspore Inorganic materials 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical group O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical group [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 229910052903 pyrophyllite Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
Landscapes
- Producing Shaped Articles From Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は優れた品質、特に長さ変化の少ないセ
メント板の製造方法に関する。
セメント板、たとえば石綿スレート板はセメン
トにアスベスト等の繊維類を加え、この配合物に
５〜10倍量程度の水を加えてスラリーとし、この
スラリーを抄造して製造される。石綿スレート板
は汎用の建築材料として使用されているが、長さ
変化率が大きいことが欠点とされている。すなわ
ち長さ変化率が大きいことから施工後、板が曲つ
たりあるいは板の突きつけ部分に隙間が生じたり
して性能ならびに美観を損つていた。このため長
さ変化率の小さいケイ酸カルシウム板等が開発さ
れているが、このものの製造にはオートクレーブ
養生を必要とするなど特殊な製法ならびに製造工
程を要するため製品のコストアツプにつながり汎
用性に欠ける欠点があつた。従つて簡便な方法で
安価に長さ変化率の小さいセメント板を製造する
ことが望まれてきた。
本発明はセメントにアスベスト等を配合してな
る石綿スレート等のセメント板を製造するに際
し、セメントに水酸化アルミニウムおよび／また
はアルミナ化合物の中から選ばれた１種またはそ
れ以上を添加する製造方法に関し、これによつて
長さ変化率を大幅に低減し得る知見を得たもので
ある。しかもオートクレーブ養生などの煩雑な工
程を必要とせず従来使用されてきた抄造法によつ
て安価に製造できるのが特徴である。
本発明に使用されるセメントは普通、早強、超
早強、高炉、フライアツシユ等の汎用のセメント
が用いられる。
アルミナ化合物としてはアルミナセメント、ア
ルミナ水和物および含水アルミナケイ酸塩が挙げ
られる。アルミナセメントには一般のアルミナセ
メントおよび高アルミナセメントが示される。ア
ルミナ水和物としてはダイアスポア、ベーマイ
ト、ハイドラルジライト、キブサイトの鉱物があ
り、さらにこれらを含有するボーキサイト、バン
土頁岩等も使用できる。また含水アルミナケイ酸
塩としてはカオリン族、モンモリロナイト族、イ
ライト族、アロフエン族、パイロフイライト族な
どを含む粘土鉱物が挙げられる。
前記水酸化アルミニウムおよび／またはアルミ
ナ化合物の中から選ばれた１種あるいはそれ以上
を組合わせて用いることができる。その添加量は
セメントに対して内割で水酸化アルミニウムが２
〜25％、好ましくは2.5〜20％であり、アルミナ
化合物は５〜40％、好ましくは10〜30％である。
添加量が下限未満では長さ変化率低減の効果がな
く、また上限を超えても長さ変化率の低減効果は
頭打ちとなり、逆に強度が大幅に低下するので好
ましくない。
従来繊維としてはアスベスト、耐アルカリ繊維
等の無機質繊維やパルプ、ナイロン、ポリプロピ
レン等の汎用の有機質繊維が用いられる。これら
繊維類の添加量はセメントに対して内割で３〜30
％、一般には10〜20％の範囲で用いられる。
さらに充填材として長さ変化率の低減効果の助
長、増量、補強、作業性等の目的から石灰石、ケ
イ石、タルク、スラグ、フライアツシユ等の粉末
を前記セメント、水酸化アルミニウムおよび／ま
たはアルミナ化合物、繊維類からなる配合物に添
加することができる。
水酸化アルミニウム、およびアルミナ化合物の
粉末度はブレーン値で2000〜7000cm2／ｇ程度が好
ましい。2000cm2／ｇより粗すぎるとセメントとの
反応性が悪く、またスラリーとしたときに分離を
起す。また7000cm2／ｇより細かすぎると抄造の際
にメツシユを介しての固液分離に長時間を要し生
産性を低下するのみでなく、水分を多く含んだ性
状の悪い製品になりやすい。
上記の添加材のうちアルミナ化合物としてアル
ミナセメントを添加する場合にはオキシカルボン
酸およびその塩類、たん白質あるいはその変性物
およびその塩類等汎用の遅延剤を適宜加える。そ
の他のアルミナ化合物を使用した場合は遅延剤を
用いる必要はない。
本発明において使用する水は配合物に対し５〜
10倍量を用いる。水を加えてスラリーとするには
パルパー等の撹拌機で撹拌混合する。得られたス
ラリーは汎用の丸網抄造機あるいは長網抄造機で
抄造し、抄造体を必要があればロールプレスある
いは面プレスを行なつてセメント板とし、大気圧
下で慣用の方法にしたがつて養生する。
本発明によれば水酸化アルミニウムおよび／ま
たはアルミナ化合物を添加することにより従来の
セメント板の欠点であつた長さ変化率を大幅に低
減し得た。セメントに対して非活性な石灰石粉末
の如き充填材を添加した場合、長さ変化率はプレ
ーンの場合よりも若干減少する。しかし本発明に
おいてはプレーンに充填材を添加した場合に比べ
長さ変化率の低減効果はより大きく、単なる増量
材としての価値以上のものがあつた。
さらに本発明においては水酸化アルミニウムお
よび／またはアルミナ化合物を添加することによ
り、カサ比重が低減するため、比強度（曲げ強
度／比重の２乗）はプレーンあるいはプレーンに
石灰石粉末を添加した場合より相対的に大きくな
り強度性状が向上するという好結果が得られた。
また水酸化アルミニウムおよび／またはアルミ
ナ化合物は水和時にセメントのCa（OH）2と反応
しており、Ca（OH）2のＸ線回析ピークが大幅に
減少する。このためロツクウール、ガラス繊維
等、従来、セメント等に配合し得なかつた繊維等
も補強効果を十分有していることが判明した。従
つて、衛生上とかく問題のあるアスベストを上記
繊維等で大部分代替しその使用量を５％以下に、
減少させてもセメント板として充分な強度を有す
るものを得ることができるようになつた。
次に実施例を挙げて本発明を説明する。
実施例
普通ポルトランドセメントに対して表−１に示
す水酸化アルミニウムまたはアルミナ化合物を添
加し、繊維類を配合し（表中、各％はセメントに
対する内割重量％を示す。）、これらの配合物に10
倍量の水を加えてスラリーとし、このスラリーを
丸網抄造機にて抄造し100Kg／cm2のプレス成形を
行なつてセメント板を製造した。得られた製品か
ら、サンプルを採取し、かさ比重、および曲げ強
度試験はJIS A5403、長さ変化率はJIS A5418に
従つてそれぞれ行なつた。Ca（OH）2の残存量は、
Ｘ線回折（Cu−Kα、2θ＝18.1゜）において、普通
ポルトランドセメントの場合のピークを基準にし
た比較値（ピーク比）として示した。得られた結
果を表―２に示す。
The present invention relates to a method for producing cement boards of excellent quality, especially with little change in length. Cement boards, such as asbestos slate boards, are manufactured by adding fibers such as asbestos to cement, adding about 5 to 10 times the amount of water to this mixture to form a slurry, and making paper from this slurry. Asbestos slate board is used as a general-purpose building material, but its disadvantage is that it has a large rate of change in length. In other words, due to the large rate of change in length, after construction, the board may become bent or a gap may appear at the butt part of the board, impairing performance and aesthetics. For this reason, calcium silicate plates with a small rate of change in length have been developed, but the manufacturing of these plates requires special manufacturing methods and processes such as autoclave curing, which increases the cost of the product and lacks versatility. There were flaws. Therefore, it has been desired to manufacture a cement board with a small rate of change in length by a simple method and at low cost. The present invention relates to a manufacturing method in which one or more selected from aluminum hydroxide and/or alumina compounds are added to cement when manufacturing cement boards such as asbestos slate made by blending asbestos with cement. As a result, we have obtained the knowledge that the rate of change in length can be significantly reduced. Moreover, it is characterized by the fact that it can be manufactured at low cost by the conventional paper-making method without requiring complicated processes such as autoclave curing. The cement used in the present invention is generally a general-purpose cement such as early strength, ultra early strength, blast furnace, or fly ash cement. Alumina compounds include alumina cement, alumina hydrate, and hydrated alumina silicates. Alumina cement includes general alumina cement and high alumina cement. Examples of the alumina hydrate include minerals such as diaspore, boehmite, hydralgilite, and kibsite, and bauxite, vane shale, and the like containing these minerals can also be used. Hydrous alumina silicates include clay minerals including kaolin group, montmorillonite group, illite group, allophene group, pyrophyllite group, and the like. One or more selected from the above aluminum hydroxide and/or alumina compounds can be used in combination. The amount of aluminum hydroxide added is 2 parts per cement.
~25%, preferably 2.5-20%, and alumina compounds 5-40%, preferably 10-30%.
If the amount added is less than the lower limit, there will be no effect of reducing the rate of change in length, and if the amount exceeds the upper limit, the effect of reducing the rate of change in length will reach a ceiling, and on the contrary, the strength will drop significantly, which is not preferable. Conventional fibers include inorganic fibers such as asbestos and alkali-resistant fibers, and general-purpose organic fibers such as pulp, nylon, and polypropylene. The amount of these fibers added is 3 to 30% relative to cement.
%, generally used in the range of 10 to 20%. Furthermore, powders such as limestone, silica stone, talc, slag, fly ash, etc. are used as fillers for the purpose of promoting the effect of reducing the length change rate, increasing weight, reinforcing, workability, etc. It can be added to formulations consisting of fibers. The fineness of the aluminum hydroxide and alumina compound is preferably about 2000 to 7000 cm 2 /g in Blaine value. If it is too coarse than 2000 cm 2 /g, the reactivity with cement will be poor and separation will occur when it is made into a slurry. On the other hand, if the particle size is too fine than 7000 cm 2 /g, it will take a long time to separate solid and liquid through the mesh during paper making, which not only reduces productivity but also tends to result in a product containing a lot of water and having poor properties. When alumina cement is added as an alumina compound among the above-mentioned additives, general-purpose retardants such as oxycarboxylic acids and their salts, proteins or modified products thereof, and their salts are appropriately added. If other alumina compounds are used, there is no need to use a retarder. The water used in the present invention is
Use 10 times the amount. To make a slurry by adding water, stir and mix using a stirrer such as a pulper. The obtained slurry was made into a paper using a general-purpose circular paper making machine or a fourdrinier paper making machine, and if necessary, the paper product was roll pressed or surface pressed to form a cement board, which was then processed under atmospheric pressure using a conventional method. Let's take care of ourselves. According to the present invention, by adding aluminum hydroxide and/or an alumina compound, the rate of change in length, which was a drawback of conventional cement boards, could be significantly reduced. When a filler such as inactive limestone powder is added to the cement, the rate of change in length is slightly reduced compared to the plain case. However, in the present invention, the effect of reducing the rate of change in length was greater than when the filler was added to the plain material, and the material was more than just a filler. Furthermore, in the present invention, by adding aluminum hydroxide and/or an alumina compound, the bulk specific gravity is reduced, so the specific strength (bending strength/square of specific gravity) is higher than when limestone powder is added to plain or plain. Good results were obtained in that the strength and properties of the steel were improved. Furthermore, the aluminum hydroxide and/or alumina compound reacts with Ca(OH) 2 of the cement during hydration, and the X-ray diffraction peak of Ca(OH) 2 is significantly reduced. Therefore, it has been found that fibers such as rock wool and glass fibers, which could not be mixed into cement, etc., have sufficient reinforcing effects. Therefore, asbestos, which is problematic in terms of hygiene, should be largely replaced with the above-mentioned fibers, etc., and the amount used should be reduced to 5% or less.
It has become possible to obtain a cement board with sufficient strength even if the amount is reduced. Next, the present invention will be explained with reference to Examples. Example Aluminum hydroxide or alumina compounds shown in Table 1 were added to ordinary Portland cement, and fibers were blended (in the table, each percentage indicates the percentage by weight relative to the cement), and these blends were prepared. to 10
Double the amount of water was added to form a slurry, and this slurry was made into paper using a circular mesh paper making machine and press-formed at 100 kg/cm 2 to produce a cement board. Samples were taken from the obtained products, and bulk specific gravity and bending strength tests were conducted in accordance with JIS A5403, and length change rate was conducted in accordance with JIS A5418. The remaining amount of Ca(OH) 2 is
In X-ray diffraction (Cu-Kα, 2θ=18.1°), it is shown as a comparative value (peak ratio) based on the peak of ordinary Portland cement. The results obtained are shown in Table 2.
【表】【table】
【表】【table】
【表】
比較例
普通ポルトランドセメントおよびそのセメント
に表−３に示す各種材料を添加配合した以外は前
記実施例の手順にしたがつて、セメント板を製造
した。得られた結果を表−４に示す。[Table] Comparative Example Cement boards were manufactured according to the procedure of the previous example except that ordinary Portland cement and the various materials shown in Table 3 were added to the cement. The results obtained are shown in Table-4.
【表】【table】
【表】
以上の実施例、比較例からわかるように本発明
に基づく水酸化アルミニウムおよび／またはアル
ミナ化合物を添加することにより、長さ変化率が
格段に改善された。
しかも、従来ロツクウール等使用不可能であつ
たこの種製品に上記手段を用いたことによつて十
分使用できることが確認された。[Table] As can be seen from the above Examples and Comparative Examples, the rate of change in length was significantly improved by adding the aluminum hydroxide and/or alumina compound based on the present invention. Moreover, it has been confirmed that by applying the above-mentioned method, it can be used satisfactorily for this type of product, which conventionally could not be used for, such as rock wool.
Claims (1)
化アルミニウムおよび／またはアルミナ化合物を
添加し、これらに繊維類と水を加えてスラリーと
なし、該スラリーを抄造することを特徴とするセ
メント板の製造方法。1. A cement board characterized by adding aluminum hydroxide and/or alumina compound having a fineness of 2000 to 7000 cm 2 /g to cement, adding fibers and water to form a slurry, and making the slurry into paper. manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4564582A JPS58167459A (en) | 1982-03-24 | 1982-03-24 | Manufacture of cement board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4564582A JPS58167459A (en) | 1982-03-24 | 1982-03-24 | Manufacture of cement board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58167459A JPS58167459A (en) | 1983-10-03 |
| JPH0216261B2 true JPH0216261B2 (en) | 1990-04-16 |
Family
ID=12725103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4564582A Granted JPS58167459A (en) | 1982-03-24 | 1982-03-24 | Manufacture of cement board |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58167459A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6177687A (en) * | 1984-09-22 | 1986-04-21 | エスケ−化研株式会社 | High refractory properties composition |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5325619A (en) * | 1976-07-31 | 1978-03-09 | Matsushita Electric Works Ltd | Continuous process for production of glasssfibreereinforced cement products |
-
1982
- 1982-03-24 JP JP4564582A patent/JPS58167459A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5325619A (en) * | 1976-07-31 | 1978-03-09 | Matsushita Electric Works Ltd | Continuous process for production of glasssfibreereinforced cement products |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58167459A (en) | 1983-10-03 |
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