JP6535180B2 - Highly durable cement board and its cement composition - Google Patents
Highly durable cement board and its cement composition Download PDFInfo
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Description
本発明は耐久性に優れたセメント板の製造方法とそのセメント組成物に関する。より詳しくは、本発明は、建築外装材に使用される押出成形セメント板などについて、供用後に強度が向上し、外装材として必須である長期耐久性を有するセメント板の製造方法とそのセメント組成物に関する。
The present invention relates to a method for producing a cement board having excellent durability and a cement composition thereof. More specifically, the present invention relates to a method for producing a cement board having a long-term durability which is improved as a sheathing material and whose strength is improved after service with respect to an extrusion-formed cementing board used for a building exterior material and the like About.
押出成形セメント板が建築物の外壁材などに多く用いられている。一般に押出成形セメント板は、セメントに繊維、骨材、増粘剤などを配合した組成物を押出成形し、高温高圧養生（オートクレーブ養生）して製造されている。押出成形では、成形時の圧力によって配合物から水が脱水して成形不能になるのを防ぐために、繊維と増粘剤が配合されている。 Extruded cement boards are often used for exterior wall materials of buildings and the like. Generally, an extruded cement board is manufactured by extruding a composition in which fibers, aggregates, thickeners and the like are blended with cement, and high temperature high pressure curing (autoclave curing). In extrusion molding, fibers and a thickener are blended to prevent water from dewatering from the composition and becoming unmoldable due to pressure during molding.
押出成形セメント板に配合する繊維として、従来のアスベスト繊維に代えて、パルプなどの有機繊維や合成繊維、ガラス繊維などが用いられているが、いずれも保水性や保形性などがアスベスト繊維よりも劣るため押出し成形性が不十分であった。また、増粘剤を増量して押出し成形性を高めることが行われるが、増粘剤は高価であるため製造コストが高くなる問題がある。 Organic fibers such as pulp, synthetic fibers, glass fibers, etc. are used in place of conventional asbestos fibers as fibers to be added to the extrusion cement board. Because of inferiority, extrusion moldability was insufficient. In addition, although the thickening agent is increased to improve the extrusion formability, the thickening agent is expensive, and there is a problem that the manufacturing cost becomes high.
押出成形における問題を解決するため、水硬性物質、骨材、繊維からなる押出成形組成物に、押出助剤としてポリオキシアルキレン誘導体の共重合物を含有させたセメント系押出用組成物およびこれを硬化させたセメント製品が提案されている（特許文献１）。
また、水硬性物質、フライアッシュ、繊維からなる押出成形セメント組成物において、押出助剤として含窒素ポリオキシアルキレン誘導体を添加することによって、フライアッシュの未燃カーボンの変動による生産性低下を防止するとともに珪石単独使用のときと同様の強度発現を図ることが知られている（特許文献２）。
In order to solve the problem in extrusion molding, a composition for cement-based extrusion in which a copolymer of a polyoxyalkylene derivative is contained as an extrusion aid in an extrusion molding composition comprising a hydraulic material, aggregate, and fibers, and Hardened cement products have been proposed (US Pat.
In addition, in an extrusion-molded cement composition comprising a hydraulic material, fly ash, and fibers, a nitrogen-containing polyoxyalkylene derivative is added as an extrusion aid to prevent the decrease in productivity due to fluctuation of unburned carbon in fly ash. At the same time, it is known that the same strength expression as in the case of using silica stone alone is intended (Patent Document 2).
さらに、特定直径と繊維長を有する長繊維と短繊維の混合物からなるパルプ繊維を用いることによって、従来と同粘度レベルの増粘剤を使用しても良好な成形性を有する押出成形セメント用組成物が提案されている（特許文献３）。
また、珪石等に代えてフライアッシュを用いることによって、オートクレーブ養生によってもポゾラン反応しない未反応のフライアッシュを含有させて曲げ強度を高めた珪酸カルシウム成形体が提案されている（特許文献４）。
Furthermore, by using pulp fibers consisting of a mixture of long fibers and short fibers having a specific diameter and fiber length, a composition for extrusion-molded cement having good formability even when using thickeners of the same viscosity level as before. Objects have been proposed (Patent Document 3).
In addition, a calcium silicate molded body is proposed in which the bending strength is enhanced by using unreacted fly ash which does not react with pozzolan even by aging the autoclave by using fly ash instead of silica stone or the like (Patent Document 4).
通常、押出成形セメント板は、押出成形後に１７０℃〜１８０℃でのオートクレーブ養生を行う。この促進養生において、セメントのカルシウム分と珪酸質粉末のシリカ分が反応してＣＳＨ水和物やトバモライト等の水和生成物が生成して水和反応が終結する。このためオートクレーブ養生後は、硬化体の供用後の強度増進は期待できない。むしろ供用後にトバモライトやＣＳＨ水和物の炭酸化反応によって硬化体組織が緩み、強度が僅かに低下する場合がある。 In general, extruded cement boards are autoclaved at 170 ° C. to 180 ° C. after extrusion. In this accelerated curing, the calcium content of the cement and the silica content of the siliceous powder react to form a hydration product such as CSH hydrate or tobermorite and the hydration reaction is terminated. For this reason, after autoclave curing, the strength can not be expected to be increased after the service of the cured product. Rather, the hardened body structure may be loosened by the carbonation reaction of tobermorite or CSH hydrate after service, resulting in a slight decrease in strength.
本発明は、オートクレーブ養生して製造されるセメント板について、オートクレーブ養生後においても、セメント未水和物、またはセメント未水和物と珪酸質粉末の未水和物がセメント板の硬化体中に残存し、オートクレーブ養生後ならびに供用後も強度が増進するようにしたセメント板の製造方法とそのセメント組成物を提供する。
The present invention relates to a cement board produced by autoclave curing and, even after autoclave curing, cement unhydrated or unhydrated cement unhydrated and siliceous powder in the hardened body of cement plate Disclosed is a method for producing a cement board which remains and whose strength is enhanced after autoclave curing and after use, and its cement composition.
本発明は、以下の構成からなるセメント組成物と、該セメント組成物によって製造するセメント板の製造方法に関する。
〔１〕セメントと珪酸質粉末からなる水硬性材料と、骨材、繊維および混和剤を含み、この板状押出成形体をオートクレーブ養生してなるセメント板を製造するセメント組成物において、上記水硬性材料がブレーン比表面積２０００cm２/ｇ以上の微粒粉と、１５００cm２/g以上〜２０００cm２/g未満の粗粒粉とからなり、セメント粗粒粉と珪酸質粗粒粉の合計量が１.０質量％〜１５.０質量％であって、水硬性材料の含有量が３０質量％〜９５質量％であり、該水硬性材料中のセメント量が珪酸質粉末量の１倍量以上であることを特徴とするセメント組成物。
〔２〕水硬性材料中のセメント粗粒粉の量が１.４質量％〜１３.０質量％である上記[１]に記載するセメント組成物。
〔３〕水硬性材料中の珪酸質粗粒粉の量が１.３質量％〜７.５質量％である上記[１]または上記[２]に記載するセメント組成物。
〔４〕セメントと珪酸質粉末からなる水硬性材料と骨材、繊維および混和剤を含み、上記水硬性材料がブレーン比表面積２０００cm２/ｇ以上の微粒粉と、１５００cm２/g以上〜２０００cm２/g未満の粗粒粉とからなり、セメント粗粒粉と珪酸質粗粒粉の合計量が１.０質量％〜１５.０質量％であって、水硬性材料の含有量が３０質量％〜９５質量％であり、該水硬性材料中のセメント量が珪酸質粉末量の１倍量以上であるセメント組成物を板状に押出成形し、オートクレーブ養生してなることを特徴とするセメント板の製造方法。
The present invention relates to a cement composition comprising the following constitution, and a method for producing a cement board produced by the cement composition.
[1] A hydraulic material consisting of cement and siliceous powder, aggregate, comprising fibers and admixtures, the plate-like extrudate in cement compositions to produce a cement plate formed by autoclave curing, the hydraulic materials and Blaine specific surface area of 2000 cm 2 / g or more fine powder consists of a 1500 cm 2 / g or more ~2000cm 2 / g less coarse powder, the total amount of cement coarse powder and siliceous coarse powder 1. The content of the hydraulic material is 30% to 95% by mass, and the amount of cement in the hydraulic material is at least 1 time the amount of the siliceous powder. Cement composition characterized by.
[2] The cement composition according to the above [1], wherein the amount of cement coarse particles in the hydraulic material is 1.4% by mass to 13.0% by mass.
[3] The cement composition according to the above [1] or [2], wherein the amount of siliceous coarse particles in the hydraulic material is 1.3% by mass to 7.5% by mass.
[4] hydraulic material and aggregate consisting of cement and siliceous powder comprises fibers and admixtures, the hydraulic material is the Blaine specific surface area of 2000 cm 2 / g or more fine powder, 1500 cm 2 / g or more ～2000Cm 2 / g of coarse particle powder, the total amount of cement coarse particle powder and siliceous coarse particle powder is 1.0 mass% to 15.0 mass% , and the content of hydraulic material is 30 mass% A cement board characterized in that it is formed by extruding a cement composition having an amount of cement in an amount of at least 1 times the amount of siliceous powder in an amount of about 95% by mass, and autoclaved for curing. Manufacturing method .
〔具体的な説明〕
本発明のセメント組成物は、セメントと珪酸質粉末からなる水硬性材料と、骨材、繊維および混和剤を含み、この板状押出成形体をオートクレーブ養生してなるセメント板を製造するセメント組成物において、上記水硬性材料がブレーン比表面積２０００cm２/ｇ以上の微粒粉と、１５００cm２/g以上〜２０００cm２/g未満の粗粒粉とからなり、セメント粗粒粉と珪酸質粗粒粉の合計量が１.０質量％〜１５.０質量％であって、水硬性材料の含有量が３０質量％〜９５質量％であり、該水硬性材料中のセメント量が珪酸質粉末量の１倍量以上であることを特徴とするセメント組成物である。
[Specific description]
The cement composition of the present invention comprises a hydraulic material comprising cement and siliceous powder, an aggregate, fibers and an admixture, and the cement composition for producing a cement board obtained by autoclave-curing this plate-like extrusion molded body in the above hydraulic material and the Blaine specific surface area of 2000 cm 2 / g or more fine powder consists of a 1500 cm 2 / g or more ~2000cm 2 / g less coarse powder, cement coarse powder and siliceous coarse powder The total amount is 1.0% by mass to 15.0% by mass , the content of the hydraulic material is 30% by mass to 95% by mass, and the cement amount in the hydraulic material is 1 of the amount of the siliceous powder It is a cement composition characterized by being at least a double amount .
本発明は、セメント組成物に含まれる水硬性材料の粗粒粉量を上記範囲に調整することによって、該組成物を板状に押出成形してオートクレーブ養生してなるセメント板について、その強度が養生後にも増進するようにしたものである。 In the present invention, by adjusting the amount of coarse-grained powder of hydraulic material contained in the cement composition to the above-mentioned range, the strength of the cement board obtained by extruding the composition into a plate and curing the autoclave is It is intended to improve after curing.
本発明のセメント組成物に含まれる水硬性材料の含有量は約３０質量％〜約９５質量％が良く、さらには約４０質量％〜９０質量％が好ましい。セメント組成物中の水硬性材料が上記含有量より少ないと、成形したセメント板について所望の強度が得られず、良好な押出成形性が得られない。また、水硬性材料が上記含有量よりも多いと、相対的に骨材量が少なくなるので、やはり十分な強度や良好な押出成形性が得られない。 The content of the hydraulic material contained in the cement composition of the present invention is preferably about 30% by mass to about 95% by mass, and more preferably about 40% by mass to 90% by mass. If the hydraulic material in the cement composition is less than the above content, the desired strength can not be obtained for the formed cement board, and good extrusion formability can not be obtained. Further, when the hydraulic material is more than the above content, the amount of aggregate relatively decreases, so that sufficient strength and good extrusion moldability can not be obtained.
水硬性材料はセメントと珪酸質粉末とからなる。水硬性材料の構成材料であるセメントは、普通ポルトランドセメントなどの各種ポルトランドセメント、早強ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメントなど各種のポルトランドセメントを用いることができる。珪酸質粉末は、珪石粉末等の天然ポゾラン物質粉末、または石炭火力発電所の副産物である石炭灰やフライアッシュ（JIS A 6201:1999 「コンクリート用フライアッシュ」に規定されるＩ級、II級、III級、IV級のフライアッシュ）などを用いることができる。 The hydraulic material comprises cement and siliceous powder. The cement which is a constituent material of hydraulic material can use various portland cements, such as various portland cements, such as ordinary portland cement, early high strength portland cement, moderate heat portland cement, low heat portland cement, etc. Silica powder is natural pozzolanic material powder such as silica stone powder, or coal ash or fly ash which is a by-product of a coal-fired power plant (class A, class II specified in JIS A 6201: 1999 “fly ash for concrete” Class III, IV class fly ash) and the like can be used.
水硬性材料に含まれるセメント量は珪酸質粉末量の約１.０倍量以上が適当であり、約１.０〜約８倍量が好く、約１．５〜６倍量がさらに好ましい。セメント量が珪酸質粉末量の１.０倍量より少ないと、カルシウム量が不足し水和反応が不十分になるのでセメント板の強度が低下する。一方、セメント量が珪酸質粉末量の８倍量を超えると珪酸質粉末を加える効果が十分に得られない。 The amount of cement contained in the hydraulic material is suitably about 1.0 times or more of the amount of siliceous powder, preferably about 1.0 to about 8 times, and more preferably about 1.5 to 6 times. . If the amount of cement is less than 1.0 times the amount of siliceous powder, the amount of calcium will be insufficient and the hydration reaction will be insufficient, so the strength of the cement board will decrease. On the other hand, when the cement amount exceeds eight times the amount of the siliceous powder, the effect of adding the siliceous powder can not be obtained sufficiently.
上記水硬性材料を構成するセメントおよび珪酸質粉末は何れもレーン比表面積２０００cm２/ｇ以上の微粒粉と、１５００cm２/g以上〜２０００cm２/g未満の粗粒粉とによって形成されている。
セメントおよび珪酸質粉末について、ブレーン比表面積１５００cm２/g以上〜２０００cm２/g未満の粉末を粗粒粉と云い、ブレーン比表面積２０００cm２/ｇ以上の粉末を微粒粉と云う。また、セメント粗粒粉とセメント微粒粉を含めてセメントと云い、珪酸質粗粒粉と珪酸質微粒粉を含めて珪酸質粉末と云う。また、セメント粗粒粉と珪酸質粗粒粉を含めて単に粗粒粉と云う。
Cement and siliceous powder and Lane ratio Any surface area of 2000 cm 2 / g or more fine powder constituting the hydraulic material, and is formed by a 1500 cm 2 / g or more ~2000cm 2 / g of less than coarse powder.
For cement and siliceous powder, refers to Blaine specific surface area of 1500 cm 2 / g or more ~2000cm powder of less than 2 / g and coarse powder, referred to as fine powder Blaine specific surface area of 2000 cm 2 / g or more powder. Also, cement coarse powder and cement fine powder are referred to as cement, and siliceous coarse powder and siliceous fine powder are referred to as siliceous powder. Also, cement coarse powder and siliceous coarse powder are simply referred to as coarse powder.
本発明のセメント組成物において、セメント粗粒粉と珪酸質粗粒粉の合計量は１.０質量％〜１５.０質量％が良く、１.３質量％〜１３.０質量％が好ましい。セメント組成物中のセメント粗粒粉と珪酸質粗粒粉の合計量が１.０質量％未満では、オートクレーブ養生後の強度が十分に増進しない。また、該粗粒粉の量が１５.０質量％を超えると、初期強度が低下する傾向が強くなる。 In the cement composition of the present invention, the total amount of cement coarse particles and siliceous coarse particles is preferably 1.0% by mass to 15.0% by mass, and preferably 1.3% by mass to 13.0% by mass. If the total amount of cement coarse powder and siliceous coarse powder in the cement composition is less than 1.0% by mass, the strength after autoclave curing does not sufficiently improve. Moreover, when the amount of the coarse particles exceeds 15.0% by mass, the initial strength tends to decrease.
上記水硬性材料において、セメント粗粒粉の量は１.４質量％〜１３.０質量％が好ましく、３.０質量％〜１０.５質量％がより好ましい。セメント粗粒粉の量が上記範囲であるときは珪酸質粗粒粉の量はゼロでもよい。セメント粗粒粉の量が１.４質量％未満ではオートクレーブ養生後に強度が増進した後に僅かに低下する傾向が見られる。また、セメント粗粒粉の量が１３.０質量％を超えると初期強度の発現が不十分になる傾向が見られる。セメント粗粒粉の量が３.０質量％〜１０.５質量％の範囲では、初期強度が十分に発現し、長期強度が初期強度より約１割程度向上する。 In the hydraulic material, the amount of cement coarse particles is preferably 1.4% by mass to 13.0% by mass, and more preferably 3.0% by mass to 10.5% by mass. When the amount of cement coarse particles is in the above range, the amount of siliceous coarse particles may be zero. If the amount of cement coarse powder is less than 1.4% by mass, a tendency is observed that the strength is slightly improved after curing of the autoclave and then slightly decreased. Moreover, when the amount of cement coarse particles exceeds 13.0 mass%, the tendency for the expression of initial strength to be insufficient is seen. When the amount of cement coarse-grained powder is in the range of 3.0% by mass to 10.5% by mass, the initial strength is sufficiently developed, and the long-term strength is improved by about 10% over the initial strength.
上記水硬性材料において、珪酸質粗粒粉の量は１.３質量％〜７.５質量％が好ましく、１.８質量％〜５.４質量％がより好ましい。珪酸質粗粒粉の量が上記範囲であるときはセメント粗粒粉の量はゼロでもよい。珪酸質粗粒粉の量が１.３質量％未満では養生後に強度が増進した後に僅かに低下する傾向が見られる。また、該粗粒粉の量が７.５質量％を超えると長期強度の増進が小さくなる傾向がある。珪酸質粗粒粉の量が１.８質量％〜５.４質量％の範囲では、初期強度が十分に発現し、長期強度が初期強度より約１割程度向上する。 In the hydraulic material, the amount of the siliceous coarse particles is preferably 1.3% by mass to 7.5% by mass, and more preferably 1.8% by mass to 5.4% by mass. When the amount of siliceous coarse particles is in the above range, the amount of coarse cement particles may be zero. If the amount of siliceous coarse-grained powder is less than 1.3% by mass, it tends to be slightly decreased after the strength is increased after curing. In addition, when the amount of the coarse particles exceeds 7.5% by mass, the increase in long-term strength tends to be small. When the amount of coarse siliceous powder is in the range of 1.8% by mass to 5.4% by mass, the initial strength is sufficiently developed, and the long-term strength is improved by about 10% over the initial strength.
水硬性材料に含まれるセメントと珪酸質粉末の何れについても、その粗粒粉量を上記範囲に調整することによって、オートクレーブ養生後の強度を増進させることができる。該水硬性材料の粗粒粉は、セメント粗粒粉のみでもよく、珪酸質粗粒粉のみでもよい。また、セメント粗粒粉と珪酸質粗粒粉の両方を用いてもよく、これらに粗粒粉を混入することによってオートクレーブ養生後の強度を増進させることができる。 The strength after curing of the autoclave can be enhanced by adjusting the amount of coarse particles of the cement and the siliceous powder contained in the hydraulic material to the above range. The coarse particles of the hydraulic material may be only cement coarse particles or only siliceous coarse particles. Moreover, both cement coarse powder and siliceous coarse powder may be used, and by mixing coarse powder with these, strength after autoclave curing can be enhanced.
本発明のセメント組成物に含まれる骨材としては、セメント製品に一般的に配合される珪砂、砕砂、川砂、山砂、高炉スラグ砕砂などの細骨材を用いることができる。該セメント組成物中の骨材量は約１０質量％〜約６０質量％が良く、さらには押出成形性を考慮すると約１５質量％〜約４５質量％が好ましい。 As aggregates contained in the cement composition of the present invention, fine aggregates generally used in cement products, such as silica sand, crushed sand, river sand, mountain sand, blast furnace slag crushed sand, etc. can be used. The amount of aggregate in the cement composition is preferably about 10% by mass to about 60% by mass, and further preferably about 15% by mass to about 45% by mass in consideration of the extrusion formability.
本発明のセメント組成物に含まれる繊維はパルプ繊維として、クラフトパルプ、サイザルパルプ、ＰＳパルプ、ＰＫパルプ、古紙パルプなどの天然繊維を用いることができる。繊維長は、押出成形性を考慮すると１ｍｍ〜６ｍｍが好ましく、該セメント組成物中の繊維量は約１質量％〜約３質量％が好ましい。 As fibers contained in the cement composition of the present invention, natural fibers such as kraft pulp, sisal pulp, PS pulp, PK pulp, and waste paper pulp can be used as pulp fibers. The fiber length is preferably 1 mm to 6 mm in consideration of the extrusion formability, and the fiber amount in the cement composition is preferably about 1% by mass to about 3% by mass.
本発明のセメント組成物は、必要に応じて、増粘剤、減水剤、流動化剤などの混和剤を含むことができる。混和剤の含有量は約３重量％未満が好ましい。 The cement composition of the present invention can optionally contain an admixture such as a thickener, a water reducing agent, a fluidizing agent and the like. The content of admixture is preferably less than about 3% by weight.
本発明の上記セメント組成物を板状に押出成形し、該板状成形体をオートクレーブに入れ、１７０℃〜１８０℃の高温高圧下で水和反応を促進してセメント板が製造される。 The cement composition of the present invention is extruded into a plate, and the plate-like compact is put into an autoclave, and the hydration reaction is promoted under high temperature and high pressure of 170 ° C to 180 ° C to produce a cement plate.
本発明のセメント組成物を板状に押出成形してオートクレーブ養生してなるセメント板は、製造直後の曲げ強度は従来品と同程度であるが、供用後に曲げ強度が次第に向上する。具体的には、本発明の実施例では、製造直後の曲げ強度に対して３年後の曲げ強度は約１割程度向上する。 The cement board obtained by extruding the cement composition of the present invention into a plate and curing it in an autoclave has a bending strength immediately after production equivalent to that of a conventional product, but the bending strength gradually improves after service. Specifically, in the embodiment of the present invention, the bending strength after three years is improved by about 10% with respect to the bending strength immediately after production.
本発明の実施例を以下に示す。製造したセメント板の曲げ強度は規格（JIS A 5441：2003「押出成形セメント板」）に基づいて測定した。なお、実施例では、珪酸質粉末として珪石粉を用いた場合を示すが、これに限定されるものではなく、珪酸粉末として石炭灰やフライアッシュを用いることができる。 Examples of the invention are given below. The bending strength of the manufactured cement board was measured based on the standard (JIS A 5441: 2003 "extruded cement board"). In addition, although the case where a silica stone powder is used as a siliceous powder is shown in an Example, it is not limited to this, Coal ash and fly ash can be used as a silica powder.
〔実施例１〕
表１に示す材料を表２に示す配合で調合した乾式材料に、水を１８.５質量％加えて混練し、セメント組成物を製造した。該セメント組成物を板状（厚さ６０mm、幅６００mm、長さ２ｍ）に押出成形した。該成形板をオートクレーブに入れ、温度１７５℃、圧力８kgf/cm２で３．０時間養生し、セメント板を製造した。このセメント板について、製造直後〜３年後の曲げ強度を測定した。測定結果を表２に示した。
Example 1
18.5 mass% of water was added to a dry material prepared by blending the materials shown in Table 1 with the composition shown in Table 2, and the mixture was kneaded to produce a cement composition. The cement composition was extruded into a plate (thickness 60 mm, width 600 mm, length 2 m). The molded plate was placed in an autoclave and aged for 3.0 hours at a temperature of 175 ° C. and a pressure of 8 kgf / cm 2 to produce a cement plate. About this cement board, the bending strength immediately after manufacture-three years after was measured. The measurement results are shown in Table 2.
実施例１において、試料Ａ５は製造直後および１年後の強度が比較試料Ｂよりも低いが、２年後および３年後の強度は比較試料Ｂよりも高い。また、試料Ａ２〜Ａ５は製造直後の強度よりも３年後の強度が約１割程度高くなっており、３年後の強度は何れも比較試料Ｂよりも高い。試料Ａ１も製造直後の強度より２年後の強度が向上しており、また試料Ａ１の３年後の強度は比較試料Ｂよりも高い。一方、比較試料（No.Ｂ）は経時的な強度の増加は見られない。 In Example 1, the strength of sample A5 is lower than that of comparative sample B immediately after production and after 1 year, but higher than that of comparative sample B after 2 years and 3 years. Further, in the samples A2 to A5, the strength three years later is about 10% higher than the strength immediately after the production, and the strength three years later is higher than that of the comparative sample B. The strength of sample A1 also improves after 2 years from the strength immediately after production, and the strength of sample A1 after 3 years is higher than that of comparative sample B. On the other hand, the comparison sample (No. B) shows no increase in strength with time.
〔実施例２〕
表１に示す材料を表３に示す配合で調合した乾式材料に、水を１８.５質量％加えて混練し、セメント組成物を製造した。該セメント組成物を板状（厚さ６０mm、幅６００mm、長さ２ｍ）に押出成形した。該成形板をオートクレーブに入れ、温度１７５℃、圧力８kgf/cm２で３．０時間養生し、セメント板を製造した。このセメント板について、製造直後〜３年後の曲げ強度を測定した。測定結果を表３に示した。
Example 2
18.5 mass% of water was added to a dry material prepared by blending the materials shown in Table 1 with the composition shown in Table 3, and the mixture was kneaded to produce a cement composition. The cement composition was extruded into a plate (thickness 60 mm, width 600 mm, length 2 m). The molded plate was placed in an autoclave and aged for 3.0 hours at a temperature of 175 ° C. and a pressure of 8 kgf / cm 2 to produce a cement plate. About this cement board, the bending strength immediately after manufacture-three years after was measured. The measurement results are shown in Table 3.
実施例２において、試料Ａ６〜Ａ１０の製造直後の強度は比較試料Ｂと同程度であるが、３年後の強度は何れも比較試料Ｂよりも高い。また、試料Ａ６〜Ａ１０の何れも強度が経時的に増進しており、製造直後の強度よりも３年後の強度が約１割程度高くなっている。 In Example 2, the strength immediately after production of the samples A6 to A10 is comparable to that of the comparative sample B, but the strength after 3 years is higher than that of the comparative sample B. Further, in each of the samples A6 to A10, the strength increases with time, and the strength after three years is about 10% higher than the strength immediately after the production.
〔実施例３〕
表１に示す材料を表４に示す配合で調合した乾式材料に、水を１８.５質量％加えて混練し、セメント組成物を製造した。該セメント組成物を板状（厚さ６０mm、幅６００mm、長さ２ｍ）に押出成形した。該成形板をオートクレーブに入れ、温度１７５℃、圧力８kgf/cm２で３．０時間養生し、セメント板を製造した。このセメント板について、製造直後〜３年後の曲げ強度を測定した。測定結果を表４に示した。
[Example 3]
18.5 mass% of water was added to a dry material prepared by blending the materials shown in Table 1 with the composition shown in Table 4, and the mixture was kneaded to produce a cement composition. The cement composition was extruded into a plate (thickness 60 mm, width 600 mm, length 2 m). The molded plate was placed in an autoclave and aged for 3.0 hours at a temperature of 175 ° C. and a pressure of 8 kgf / cm 2 to produce a cement plate. About this cement board, the bending strength immediately after manufacture-three years after was measured. The measurement results are shown in Table 4.
実施例３において、試料Ａ１１〜Ａ１５の製造直後の強度は比較試料Ｂと同程度であるが、３年後の強度は何れも比較試料Ｂよりも高い。また、試料Ａ１１〜Ａ１５の何れも強度が経時的に増進しており、製造直後の強度よりも３年後の強度が約１割程度高くなっている。 In Example 3, the strength immediately after the production of the samples A11 to A15 is comparable to that of the comparative sample B, but the strength after 3 years is higher than that of the comparative sample B. Further, in all of the samples A11 to A15, the strength increases with time, and the strength three years later is about 10% higher than the strength immediately after the production.
〔実施例４〕
表１に示す材料を表５に示す配合で調合した乾式材料に、水を１８.５質量％加えて混練し、セメント組成物を製造した。該セメント組成物を板状（厚さ６０mm、幅６００mm、長さ２ｍ）に押出成形した。該成形板をオートクレーブに入れ、温度１７５℃、圧力８kgf/cm２で３．０時間養生し、セメント板を製造した。このセメント板について、製造直後〜３年後の曲げ強度を測定した。測定結果を表５に示した。
Example 4
18.5 mass% of water was added to a dry material prepared by blending the materials shown in Table 1 with the composition shown in Table 5, and the mixture was kneaded to produce a cement composition. The cement composition was extruded into a plate (thickness 60 mm, width 600 mm, length 2 m). The molded plate was placed in an autoclave and aged for 3.0 hours at a temperature of 175 ° C. and a pressure of 8 kgf / cm 2 to produce a cement plate. About this cement board, the bending strength immediately after manufacture-three years after was measured. The measurement results are shown in Table 5.
表５に示すように、セメント組成物中の水硬性材料の含有量が３０質量％の試料Ａ１６および９５質量％の試料Ａ１７に比べて、水硬性材料の含有量が２６質量％の試料Ｃ１は曲げ強度の発現性が劣る。また９６質量％の試料Ｃ２は試料Ａ１７に比べて押出成形性が不良であり、さらにオートクレーブ養生後の曲げ強度が低下するため、水硬性材料が９５質量％を上回るようにする必要はない。従って、セメント組成物中の水硬性材料の含有量は３０質量％〜９５質量％が好ましい。 As shown in Table 5, the sample C1 having a hydraulic material content of 26% by mass is lower than the sample A16 having a hydraulic material content of 30% by mass and the sample A17 having a content of 95% by mass in the cement composition. Poor expression of bending strength. In addition, the 96 mass% sample C2 has inferior extrusion formability as compared with the sample A17, and the bending strength after autoclave curing is reduced, so the hydraulic material does not have to be more than 95 mass%. Therefore, the content of the hydraulic material in the cement composition is preferably 30% by mass to 95% by mass.
Claims (4)
Hydraulic material and aggregate consisting of cement and siliceous powder comprises fibers and admixtures, and the hydraulic material is Blaine specific surface area of 2000 cm 2 / g or more fine powder, 1500 cm 2 / g or more ~2000cm less than 2 / g And the total amount of cement coarse powder and siliceous coarse powder is 1.0% by mass to 15.0% by mass , and the content of the hydraulic material is 30% by mass to 95% % a and cement amount of water-hardening material is extruded cement composition is 1 times or more siliceous powder amount in a plate shape, manufacturing method of cement board, characterized in that formed by autoclave curing .
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