JPS62260744A - Manufacture of fiber reinforced cement product - Google Patents
Manufacture of fiber reinforced cement productInfo
- Publication number
- JPS62260744A JPS62260744A JP10414886A JP10414886A JPS62260744A JP S62260744 A JPS62260744 A JP S62260744A JP 10414886 A JP10414886 A JP 10414886A JP 10414886 A JP10414886 A JP 10414886A JP S62260744 A JPS62260744 A JP S62260744A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- fibers
- cement
- reinforced cement
- reinforcing
- 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
- 239000000835 fiber Substances 0.000 title claims description 34
- 239000004568 cement Substances 0.000 title claims description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 239000012783 reinforcing fiber Substances 0.000 claims description 19
- 239000002253 acid Substances 0.000 claims description 18
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000010306 acid treatment Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 229920002978 Vinylon Polymers 0.000 claims description 3
- 239000010425 asbestos Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 229920002972 Acrylic fiber Polymers 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229920006231 aramid fiber Polymers 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000011256 inorganic filler Substances 0.000 claims description 2
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000012784 inorganic fiber Substances 0.000 claims 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 18
- 239000011159 matrix material Substances 0.000 description 17
- 238000005452 bending Methods 0.000 description 10
- 150000003839 salts Chemical class 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 230000003014 reinforcing effect Effects 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 125000000896 monocarboxylic acid group Chemical group 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野〕
この発明は、繊維補強セメント製品の製造方法に関し、
詳しくは乾式法又は押出成形法、注型法など、いわゆる
半乾式法と称される製法により高強度の繊維補強セメン
ト製品を製造する方法に関する。[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a method for manufacturing fiber reinforced cement products,
Specifically, the present invention relates to a method for manufacturing high-strength fiber-reinforced cement products using a so-called semi-dry method, such as a dry method, an extrusion molding method, or a casting method.
従来、主として、建築用セメント製品、例えばＪＪ［瓦
、壁板、あるいはブロック等において、これらの強度向
上を図るため、補強繊維をセメントマトリックス中に混
合することが広く行なわれている。BACKGROUND ART Conventionally, reinforcing fibers have been widely mixed into the cement matrix of cement products for construction, such as JJ roof tiles, wall boards, blocks, etc., in order to improve their strength.
これら繊維として、例えば石綿を始め、ガラス繊維、ア
ラミド繊維、炭素繊維等の無ａ質繊維、あるいはアクリ
ル繊維、ビニロン繊維、パルプ繊維等種々の繊維が提案
されかつ、実際に使用されている。As these fibers, various fibers such as asbestos, amorphous fibers such as glass fibers, aramid fibers, and carbon fibers, acrylic fibers, vinylon fibers, and pulp fibers have been proposed and actually used.
上記各種の補強繊維のセメントマトリックスに対する補
強効果は、繊維自体の伸び率の低さに大きく関与してい
ると考えられ、事実かかる点は種々の実験により既に確
認されている所である。The reinforcing effect of the above-mentioned various reinforcing fibers on the cement matrix is thought to be largely related to the low elongation rate of the fibers themselves, and in fact, this point has already been confirmed through various experiments.
しかしながら、上記補強効果は補強繊維と、セメントマ
トリックスとの接着性によっても大きく影響されると考
えられ、例えば、いかに伸び率の低い材質の補強繊維を
用いても該繊維がセメントマトリックスに接着性を有し
ないものであれば製品に応力が加えられた時、いわゆる
繊維のすり抜けが生じ、充分な補強効果が得られないと
いった問題がある。However, the above-mentioned reinforcing effect is thought to be greatly influenced by the adhesion between the reinforcing fibers and the cement matrix. For example, no matter how low the elongation rate of reinforcing fibers is used, the fibers do not have sufficient adhesion to the cement matrix. If the product does not have this, there is a problem that when stress is applied to the product, so-called fiber slip-through occurs, and a sufficient reinforcing effect cannot be obtained.
従来においては、かかる問題を回避するため、親水性の
有る繊維を選択使用したり、あるいは、表面に凹凸を形
成した繊維を用いたりされているが、いずれによるとし
ても使用可能な繊維に制限があるか、又は繊維の製造に
非常に手間が掛かるといった問題があった。Conventionally, in order to avoid this problem, hydrophilic fibers have been selected or fibers with uneven surfaces have been used, but in either case, there are restrictions on the types of fibers that can be used. However, there were problems in that the production of the fibers was very time-consuming.
この発明は、上記問題点に鑑み、補強繊維のセメントマ
トリックスに対する接着性を向上させ、従来と同一の補
強繊維を用いたとしても補強効果を一段と向上し得る繊
維補強セメント製品の製造方法を得ることを目的として
なされたものである。In view of the above-mentioned problems, the present invention aims to improve the adhesion of reinforcing fibers to the cement matrix, and to obtain a method for producing fiber-reinforced cement products that can further improve the reinforcing effect even when using the same reinforcing fibers as before. This was done for the purpose of
即ち、この発明の繊維補強セメント仮の製造方法は、添
加すべき補強繊維に弱酸処理を施し、しかる後、該補強
繊維とセメント、無機質充填材及び必要な水とを均一混
合し、該均一混合物を成形、養生硬化することを特徴と
するものである。That is, the method for producing a temporary fiber-reinforced cement of the present invention involves subjecting the reinforcing fibers to be added to a weak acid treatment, then uniformly mixing the reinforcing fibers with cement, an inorganic filler, and necessary water, and preparing the homogeneous mixture. It is characterized by molding, curing and hardening.
一般にセメントを主成分とするマトリックスの硬化反応
時に酸を介在させることは上記反応系中に塩を生じさせ
マトリックスの結合強度に悪影υを及ぼすとして禁忌事
項とされていた。In general, it has been considered contraindicated to introduce an acid during the curing reaction of a matrix whose main component is cement, because it causes salts to form in the reaction system, which adversely affects the bonding strength of the matrix.
即ち、アルカリ反応系中に酸を介在させると、セメント
マトリックス中のカルシウム分と強固に反応し、水溶性
の無い固いカルシウム系結晶塩を生成する。かかる反応
で、セメント中のアルカリ分が中和されてしまい、セメ
ントマトリックス自体の強度発現がそれだけ■害される
。That is, when an acid is present in the alkaline reaction system, it reacts strongly with the calcium content in the cement matrix, producing a hard calcium-based crystalline salt that is not water-soluble. Such a reaction neutralizes the alkaline content in the cement, thereby impairing the strength development of the cement matrix itself.
しかしながら、上記結晶塩の生成時消費されるアルカリ
分の消費量を少なくし、また、酸マトリックスへのの分
散を無くすればセメントマトリックスのアルカリ反応に
影響を与えずに結晶塩のみの生成は、可能である筈であ
る。However, if the amount of alkali consumed during the production of the crystalline salt is reduced and its dispersion into the acid matrix is eliminated, the production of only the crystalline salt can be achieved without affecting the alkaline reaction of the cement matrix. It should be possible.
本願発明は、かかる点に着目してなされたものであり、
セメントマトリックスの水和反応に影響を与えない程度
の７暦度及び量の弱酸を補強繊維表面に塗布又は、含浸
させる処理をしておき、これをセメント材料中に混合し
、繊維表面のみで上記中和反応を生じさせるのである。The present invention has been made with attention to this point,
The surface of the reinforcing fibers is coated or impregnated with a weak acid in an amount that does not affect the hydration reaction of the cement matrix, and this is mixed into the cement material and the above-mentioned effect is applied only to the fiber surface. This causes a neutralization reaction.
従って、繊維表面ではセメント中に含まれるアルカリ分
と前記処理した酸とが反応し、繊維とセメントマトリッ
クスとの間に強固な結晶塩が生成される。この結晶塩は
水溶性が無く、非常に強固な密着性が発揮される。Therefore, on the fiber surface, the alkaline content contained in the cement reacts with the treated acid, and a strong crystalline salt is generated between the fiber and the cement matrix. This crystalline salt has no water solubility and exhibits very strong adhesion.
なお、上記において弱酸処理とは、電離定数に−１Ｘｌ
０−’以下、ＰＫ値が３以上の酸であって、例えば酢酸
（ＣＩｌ、Ｃ０ＯＨ）の５％〜３０％水ン容液、クエン
酸溶液等、セメント中のカルシウム分と反応してカルシ
ウム塩を生成する弱酸溶液を補強繊維に含浸させ又は表
面塗布することを言う。 なお、補強繊維としては従来
使用されているもの全般が使用される。In addition, in the above, weak acid treatment means that the ionization constant is -1Xl
Acids with a PK value of 3 or more, such as acetic acid (CII, COOH) in 5% to 30% water, citric acid solution, etc., react with calcium in cement to form calcium salts. This refers to the process of impregnating reinforcing fibers with or coating the surface of reinforcing fibers with a weak acid solution that produces In addition, all conventionally used reinforcing fibers can be used.
また、セメント製品の製法手段としては、いわゆる乾式
法、押出成形法、注型法等の半乾式法など、繊維に処理
した弱酸がセメントマトリックス中に溶融拡散しない濃
度のスラリーを用いる製法であれば、いずれでも適用可
能である。In addition, as a manufacturing method for cement products, there are semi-dry methods such as the so-called dry method, extrusion molding method, and casting method, as long as the manufacturing method uses a slurry with a concentration that does not allow the weak acid treated with the fibers to melt and diffuse into the cement matrix. , any one of them is applicable.
以下、この発明の詳細な説明する。 The present invention will be explained in detail below.
（実施例１）
補強繊維としてパルプ繊維を用意し、該パルプ繊維１
ｋｇをスーパーミキサーに投入し、３０秒間乾燥状態の
まま混合し、次いで、酢酸の弱酸水溶流を５００ｇ加水
し、再び３，５分間用合することにより弱酸処理を行な
った。(Example 1) Pulp fibers were prepared as reinforcing fibers, and the pulp fibers 1
kg was placed in a super mixer and mixed in a dry state for 30 seconds, then 500 g of a weak acid aqueous solution of acetic acid was added thereto, and the mixture was mixed again for 3.5 minutes to perform a weak acid treatment.
この弱酸処理を行なったパルプ繊維の含水率は乾燥０％
時を基準として５０％であった。The moisture content of pulp fibers treated with this weak acid is 0% when dry.
It was 50% based on time.
なお、上記弱酸水ｌ容液に１０％、２０％及び３０９４
の三種を用意し、繊維の弱酸処理を夫々の弱酸溶液で行
なった。In addition, 10%, 20% and 3094 were added to the above weak acid aqueous solution.
Three types of fibers were prepared, and the fibers were treated with a weak acid solution of each type.
次に、上記処理済パルプ繊維の各５重量％をセメント５
１．３重量％、シリカ粉４３．７重量％と混合し、乾式
製法により、厚さ約５．７ｍｍの板状試験片を成形し、
２日間自然養生後オートクレーブ養生を８゜５ ａｔｍ
Ｇ Ｘ１５時間行ない、硬化させた。Next, 5% by weight of each of the above treated pulp fibers was added to 5% of cement.
1.3% by weight and 43.7% by weight of silica powder, and formed into a plate-shaped test piece with a thickness of about 5.7mm by dry manufacturing method.
After natural curing for 2 days, autoclave curing at 8°5 atm.
It was cured for 15 hours.
上記試験片につき、２７ Ｘ ５８曲げ試験、及びＪＩ
Ｓ４号に準拠する曲げ試験を行なった。その結果は表１
１表２に示す通りである。For the above test piece, 27 x 58 bending test and JI
A bending test was conducted in accordance with No. S4. The results are in Table 1
1 As shown in Table 2.
表１
２７ Ｘ ５８曲げ試験
表２
ＪＩＳｄ号曲げ試験
表１１表２から明らかなように、弱酸未処理の繊維より
も、１０〜３０％の弱酸処理をした補強繊維を用いた場
合強度が優れることが判明した。Table 1 27 x 58 bending test Table 2 JIS No. d bending test Table 11 As is clear from Table 2, the strength is superior when using reinforcing fibers treated with 10 to 30% weak acid than fibers not treated with weak acid. There was found.
なお、弱酸処理は、試験結果によれば２０％／８液での
処理をピークとして、その前後の濃度では、強度は低下
する傾向を示し、従って濃度の範囲は５％〜３０％ン容
ｐ（ｆ＜に止めておくことが良いことが判明した。In addition, according to the test results, the strength of weak acid treatment peaks at the treatment with 20%/8 solution, and the strength tends to decrease at concentrations before and after that, so the concentration range is 5% to 30% by volume p. (It turns out that it is better to keep it at f<.
（実施例２）
次に、実施例１と同様な補強繊維及び酸処理を行ない、
該繊維を実施例１と同一配合量のセメント、シリカ粉と
混合し、全潰に対し、１５重量％の水を加え、押出成形
により、厚さ５．７ｍｍの板状片を成形し、実施例１と
同様に養生硬化させ、これら試験片につきＪＩｓ４号曲
げ試験を行なった。(Example 2) Next, the same reinforcing fiber and acid treatment as in Example 1 were performed,
The fibers were mixed with cement and silica powder in the same amounts as in Example 1, 15% by weight of water was added to the total crushing, and a plate-like piece with a thickness of 5.7 mm was formed by extrusion molding. These test pieces were cured and cured in the same manner as in Example 1, and a JIs No. 4 bending test was conducted on these test pieces.
その結果は表３に示す通りである。The results are shown in Table 3.
なお、上記と同一混合材料によりスラリーを調整し、こ
れを注型によって試験片を作成した場合も、はぼ同様な
結果が得られた。In addition, when a slurry was prepared using the same mixed material as above and a test piece was created by casting the slurry, almost the same results were obtained.
表３
ＪＩＳ４号曲げ試験
（実施例３）
石綿繊維、ガラス繊維、アクｊＪル繊維、ビニロン繊維
を用い、これらに、各２０％酢酸水溶液による弱酸処理
を行ない、実施例１と同様な乾式製法により試験片を成
形し、これらにつき曲げ＠変試験を行なった。Table 3 JIS No. 4 bending test (Example 3) Using asbestos fiber, glass fiber, ACJJ fiber, and vinylon fiber, each was subjected to weak acid treatment with a 20% acetic acid aqueous solution, and the same dry manufacturing method as in Example 1 was performed. Test pieces were molded and subjected to bending tests.
その結果は、表４の通りである。The results are shown in Table 4.
表４
Ｊ １５４号曲げ試験
（実施例４）
実施例Ｉにおける酢酸に代え酒石酸、プロピオン酸及び
クエン酸を用いた他は、実施例１と同様に試験片を成形
し、曲げ強度試験を行なったところ、表５に示す結果が
得られた。Table 4 J No. 154 bending test (Example 4) A test piece was formed in the same manner as in Example 1, except that tartaric acid, propionic acid, and citric acid were used instead of acetic acid in Example I, and a bending strength test was conducted. However, the results shown in Table 5 were obtained.
ＪＩＳｄ号曲げ試験 表５
〔効果〕
この発明は以上のように、繊維とセメントマトリックス
との界面が弱酸とセメント中のカルシウム分との反応に
より生じる結晶塩により強固に接着されるため、従来と
同一種類の補強繊維を用いているにもかかわらず、その
補強効果は著しく向上する。また、乾式法、又は半乾式
法であるから、マトリックス中への酸の分散化も防止出
来、マトリックスの酸による悪影響も全く無い。JIS No. d bending test Table 5 [Effects] As described above, this invention is the same as the conventional method because the interface between the fiber and the cement matrix is firmly bonded by the crystalline salt produced by the reaction between the weak acid and the calcium content in the cement. Despite using different types of reinforcing fibers, the reinforcing effect is significantly improved. Furthermore, since it is a dry method or a semi-dry method, it is possible to prevent acid from dispersing into the matrix, and there is no adverse effect caused by the acid in the matrix.
Claims (3)
、該補強繊維とセメント、無機質充填材及び必要な水と
を均一混合し、該均一混合物を成形、養生硬化すること
を特徴とする繊維補強セメント製品の製造方法。(1) The reinforcing fibers to be added are treated with a weak acid, and then the reinforcing fibers are uniformly mixed with cement, an inorganic filler, and necessary water, and the uniform mixture is molded and cured to harden. Method for manufacturing fiber reinforced cement products.
り行なわれる特許請求の範囲第１項記載の繊維補強セメ
ント製品の製造方法。(2) The method for producing a fiber-reinforced cement product according to claim 1, wherein the weak acid treatment is performed with an acetic acid aqueous solution having a concentration of 5% to 30%.
しくは炭素繊維等の無機質繊維、又は、アクリル繊維、
ビニロン繊維若しくはパルプ繊維等の有機繊維のいずれ
かである特許請求の範囲第１項、又は第２項記載の繊維
補強セメント製品の製造方法。(3) The reinforcing fiber is inorganic fiber such as asbestos, glass fiber, aramid fiber or carbon fiber, or acrylic fiber,
The method for producing a fiber-reinforced cement product according to claim 1 or 2, which is made of organic fibers such as vinylon fibers or pulp fibers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10414886A JPS62260744A (en) | 1986-05-06 | 1986-05-06 | Manufacture of fiber reinforced cement product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10414886A JPS62260744A (en) | 1986-05-06 | 1986-05-06 | Manufacture of fiber reinforced cement product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62260744A true JPS62260744A (en) | 1987-11-13 |
Family
ID=14372993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10414886A Pending JPS62260744A (en) | 1986-05-06 | 1986-05-06 | Manufacture of fiber reinforced cement product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62260744A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56125263A (en) * | 1980-03-06 | 1981-10-01 | Kuraray Co | Vinylon fiber reinforced cement material |
| JPS5756363A (en) * | 1980-09-16 | 1982-04-03 | Sekisui Chemical Co Ltd | Magnesia cement mixture |
-
1986
- 1986-05-06 JP JP10414886A patent/JPS62260744A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56125263A (en) * | 1980-03-06 | 1981-10-01 | Kuraray Co | Vinylon fiber reinforced cement material |
| JPS5756363A (en) * | 1980-09-16 | 1982-04-03 | Sekisui Chemical Co Ltd | Magnesia cement mixture |
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