JP4776169B2 - Hardening accelerator for wood cement board - Google Patents

Hardening accelerator for wood cement board Download PDF

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JP4776169B2
JP4776169B2 JP2004003565A JP2004003565A JP4776169B2 JP 4776169 B2 JP4776169 B2 JP 4776169B2 JP 2004003565 A JP2004003565 A JP 2004003565A JP 2004003565 A JP2004003565 A JP 2004003565A JP 4776169 B2 JP4776169 B2 JP 4776169B2
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cement
mass
wood
anhydrous gypsum
curing
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JP2005194149A (en
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賢司 山本
和人 串橋
裕智 酒井
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Denka Co Ltd
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Denki Kagaku Kogyo KK
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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
    • C04B28/06—Aluminous cements
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators
    • C04B2103/14—Hardening accelerators
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

本発明は、主として建築板として使用される木質セメント板の製造に用いる硬化促進材に関する。   The present invention relates to a curing accelerator used for producing a wood cement board mainly used as a building board.

木質セメント板の製造工場では、早期に脱型可能な強度を発現させることで製造効率を上げることが求められており、セメントの凝結・硬化を促進させるため硬化促進材が用いられている。従来、硬化促進材としては、塩化カルシウムや亜硝酸塩、チオ硫酸塩、トリエタノールアミンなどが知られており、これらの中で性能、コストの面から塩化カルシウムが一般に用いられている。製造された木質セメント板を所定の大きさにカッティングする際、端材が生じるが、塩化カルシウムを用いた場合、塩素が含まれるため、端材の廃棄やリサイクルが難しいという問題がある。近年、環境・リサイクルに対する関心が高まる中、塩素を含まない凝結・硬化促進性に優れた硬化促進材が要望されていた。
最新・コンクリート混和剤の技術と応用、シーエムシー、Ｐ.９６、２００１ In a wood cement board manufacturing factory, it is required to increase manufacturing efficiency by developing strength that can be removed at an early stage, and hardening accelerators are used to promote the setting and hardening of cement. Conventionally, calcium chloride, nitrite, thiosulfate, triethanolamine, and the like are known as hardening accelerators, and among these, calcium chloride is generally used in terms of performance and cost. When the manufactured wood cement board is cut to a predetermined size, mill ends are generated. However, when calcium chloride is used, chlorine is contained, which causes a problem that it is difficult to dispose and recycle the mill ends. In recent years, with increasing interest in the environment and recycling, there has been a demand for a curing accelerator that does not contain chlorine and has excellent setting and curing acceleration.
Latest Concrete Admixture Technology and Applications, CMC, P.96, 2001

本発明が解決しようとする課題は、塩素を含まず、凝結・硬化促進性に優れた木質セメント板用硬化促進材、およびそれを含むセメント組成物を提供することである。   The problem to be solved by the present invention is to provide a hardening accelerator for wood cement board which does not contain chlorine and has excellent setting / hardening acceleration properties, and a cement composition containing the same.

本発明は上記の目的を達成するためのものであり、アルミナセメントと無水セッコウを含有する木質セメント板用硬化促進材である。また、アルミナセメントのＣａＯ／Ａｌ２Ｏ３質量比が０．５〜１．０である該硬化促進材であり、アルミナセメント／無水セッコウの質量比が２０／８０〜８０／２０である該硬化促進材であり、ブレーン比表面積が４０００〜８０００cm2/gである該硬化促進材であり、さらに硫酸アルミニウムを含有する該硬化促進材である。また、セメントと該硬化促進材を含有するセメント組成物であり、セメント１００質量部に対してアルミナセメントと無水セッコウを合計で０．１〜２０質量部、硫酸アルミニウムを１〜１０質量部含有するセメント組成物であり、該セメント組成物を用いた木質セメント板である。 The present invention is to achieve the above object, and is a hardening accelerator for a wood cement board containing alumina cement and anhydrous gypsum. Further, CaO / Al 2 O 3 weight ratio of the alumina cement is curing promoting material is 0.5 to 1.0, the cured mass ratio of alumina cement / anhydrous gypsum is 20/80 to 80/20 It is an accelerator, the curing accelerator having a Blaine specific surface area of 4000 to 8000 cm 2 / g, and further the aluminum accelerator-containing curing accelerator. Moreover, it is a cement composition containing cement and the hardening accelerator, and contains 0.1 to 20 parts by mass of alumina cement and anhydrous gypsum and 1 to 10 parts by mass of aluminum sulfate with respect to 100 parts by mass of cement. It is a cement composition, and is a wood cement board using the cement composition.

本発明により、塩素を含まず、凝結・硬化促進性に優れた木質セメント板用硬化促進材、およびそれを含むセメント組成物が得られる。   INDUSTRIAL APPLICABILITY According to the present invention, a hardening accelerator for a wood cement board that does not contain chlorine and is excellent in setting and hardening acceleration, and a cement composition including the same are obtained.

本発明を以下に詳細に説明する。本発明の硬化促進材は、アルミナセメントと無水セッコウを含有し、水和生成物としてエトリンガイトを生成して凝結・硬化を促進する。アルミナセメントはＣａＯ・Ａｌ２Ｏ３、ＣａＯ・２Ａｌ２Ｏ３を主成分とするものであり、市販品を使用することが可能である。無水セッコウは、フッ酸副生セッコウや天然セッコウ等が使用できる。 The present invention is described in detail below. The curing accelerator of the present invention contains alumina cement and anhydrous gypsum, and generates ettringite as a hydrated product to promote setting and curing. Alumina cement is composed mainly of CaO · Al 2 O 3, CaO · 2Al 2 O 3, it is possible to use a commercially available product. As anhydrous gypsum, hydrofluoric acid byproduct gypsum and natural gypsum can be used.

硬化促進材に含まれるアルミナセメントのＣａＯ／Ａｌ２Ｏ３質量比は０．５〜１．０が好ましい。０．５未満ではアルミナセメントの水和活性が小さいため、凝結・硬化を促進する効果が十分でない場合があり、一方、１．０を超えると凝結・硬化促進作用が大きすぎて、練り混ぜや成型に必要な作業時間が取れなくなる場合がある。ＪＩＳ ３、４種であるアルミナセメント１号品、２号品等が該当し、入手が容易で比較的安価である。 CaO / Al 2 O 3 weight ratio of alumina cement contained in the curing accelerator member is preferably 0.5 to 1.0. If it is less than 0.5, the hydration activity of the alumina cement is small, so the effect of accelerating setting / hardening may not be sufficient. On the other hand, if it exceeds 1.0, the setting / hardening promoting action is too great, In some cases, the working time required for molding cannot be taken. JIS 3, 4 types of alumina cement No. 1, No. 2, etc. are applicable and are easily available and relatively inexpensive.

硬化促進材におけるアルミナセメント／無水セッコウの質量比は２０／８０〜８０／２０が好ましく、４０／６０〜６０／４０がより好ましい。この範囲外では硬化促進材による凝結・硬化促進作用が十分でない場合がある。   The mass ratio of alumina cement / anhydrous gypsum in the curing accelerator is preferably 20/80 to 80/20, more preferably 40/60 to 60/40. Outside this range, the setting / hardening promoting action of the hardening accelerator may not be sufficient.

硬化促進材のブレーン比表面積は４０００〜８０００cm2/gが好ましく、５０００〜７０００がより好ましい。４０００cm2/g未満では凝結・硬化促進作用が小さい場合があり、一方、８０００cm2/gを超えても更なる効果が期待できない。 The brane specific surface area of the curing accelerator is preferably 4000 to 8000 cm 2 / g, more preferably 5000 to 7000. If it is less than 4000 cm 2 / g, the setting / curing promoting action may be small, while if it exceeds 8000 cm 2 / g, no further effect can be expected.

アルミナセメントと無水セッコウを含有する硬化促進材に、硫酸アルミニウムを併用することは、凝結・硬化促進作用がさらに増大するため好ましい。   Use of aluminum sulfate in combination with a hardening accelerator containing alumina cement and anhydrous gypsum is preferable because the setting / hardening promoting action is further increased.

アルミナセメントと無水セッコウを合計した添加量は、セメント１００質量部に対して０．１〜２０質量部が好ましく、０．４〜１０質量部がより好ましい。０．１質量部未満では充分な凝結・硬化促進作用が得られず、一方、２０質量部を超えると凝結・硬化促進作用が大きすぎ、練混ぜや成型に必要な作業時間が取れなくなる場合がある。さらに硫酸アルミニウムの添加量は、セメント１００質量部に対して１〜１０質量部が好ましい。１質量部未満では、凝結・硬化促進作用を増大させる効果が十分でない場合があり、一方、１０質量部を超えると凝結・硬化促進作用が大きくなりすぎ、作業時間を確保できなくなる場合がある。   0.1-20 mass parts is preferable with respect to 100 mass parts of cement, and, as for the addition amount which totaled the alumina cement and anhydrous gypsum, 0.4-10 mass parts is more preferable. If the amount is less than 0.1 parts by mass, a sufficient setting / curing accelerating effect cannot be obtained. is there. Furthermore, the addition amount of aluminum sulfate is preferably 1 to 10 parts by mass with respect to 100 parts by mass of cement. If the amount is less than 1 part by mass, the effect of increasing the setting / curing promoting action may not be sufficient. On the other hand, if the amount exceeds 10 parts by weight, the setting / curing promoting action may become too large to secure the working time.

本発明の硬化促進材を含有するセメント組成物では、普通セメント、早強セメント、中庸熱セメント、対硫酸塩セメント、低熱セメント、高炉セメント、フライアッシュセメント、シリカセメント等の各種セメントが使用できる。また、木質材として、木片、木毛、木粉、木質繊維、木質パルプ等が混合でき、必要に応じて珪砂、珪石粉、パーライト、フライアッシュ、シリカフューム、シラスバルーン、消石灰等も併用できる。さらに減水剤や防水剤、撥水剤等が添加されていてもよい。   In the cement composition containing the curing accelerator of the present invention, various cements such as ordinary cement, early-strength cement, moderately hot cement, sulfate cement, low heat cement, blast furnace cement, fly ash cement, silica cement and the like can be used. Further, as the wood material, wood pieces, wood hair, wood powder, wood fiber, wood pulp and the like can be mixed, and if necessary, silica sand, quartz stone powder, perlite, fly ash, silica fume, shirasu balloon, slaked lime and the like can be used together. Further, a water reducing agent, a waterproofing agent, a water repellent agent or the like may be added.

表１に示すように、ＣａＯ／Ａｌ２Ｏ３質量比を変えたアルミナセメントと無水セッコウを、質量比５０／５０で混合して（ブレーン比表面積６０００cm2/g）、セメント１００質量部に対して１質量部添加し、さらに、硫酸アルミニウムを３質量部添加した。水／粉体比を４０％として、２０℃で練混ぜ、凝結の始発と終結、および材齢１０時間における圧縮強度を測定した。比較例として、塩化カルシウムを１質量部添加した。結果を表１に示す。 As shown in Table 1, alumina cement and anhydrous gypsum with different CaO / Al 2 O 3 mass ratios were mixed at a mass ratio of 50/50 (Brain specific surface area of 6000 cm 2 / g), and 100 parts by mass of cement 1 part by mass was added, and 3 parts by mass of aluminum sulfate was further added. The water / powder ratio was 40%, and the mixture was kneaded at 20 ° C., and the beginning and end of setting and the compressive strength at a material age of 10 hours were measured. As a comparative example, 1 part by mass of calcium chloride was added. The results are shown in Table 1.

〈使用材料〉
セメント：普通ポルトランドセメント（電気化学工業社製）
水：水道水
アルミナセメント：市販品（電気化学工業社製）
無水セッコウ：フッ酸副生セッコウ
硫酸アルミニウム：工業品、１８水塩（大明化学社製）
塩化カルシウム：工業品（旭硝子社製） <Materials used>
Cement: Ordinary Portland cement (manufactured by Denki Kagaku Kogyo)
Water: Tap water Alumina cement: Commercial product (manufactured by Denki Kagaku Kogyo)
Anhydrous gypsum: By-product hydrofluoric acid gypsum Aluminum sulfate: Industrial product, 18 hydrate (Daimei Chemical Co., Ltd.)
Calcium chloride: Industrial product (Asahi Glass Co., Ltd.)

Figure 0004776169
Figure 0004776169

ＣａＯ／Ａｌ２Ｏ３質量比が０．７のアルミナセメントを用い、アルミナセメントと無水セッコウの質量比を変えた以外は実施例１と同様に行った。結果を表２に示す。 The same operation as in Example 1 was performed except that an alumina cement having a CaO / Al 2 O 3 mass ratio of 0.7 was used and the mass ratio of the alumina cement and anhydrous gypsum was changed. The results are shown in Table 2.

Figure 0004776169
Figure 0004776169

ＣａＯ／Ａｌ２Ｏ３質量比が０．７のアルミナセメントを用い、アルミナセメントと無水セッコウのブレーン比表面積を変えた以外は実施例１と同様に行った。結果を表３に示す。 This was carried out in the same manner as in Example 1 except that an alumina cement having a CaO / Al 2 O 3 mass ratio of 0.7 was used and the Blaine specific surface areas of the alumina cement and anhydrous gypsum were changed. The results are shown in Table 3.

Figure 0004776169
Figure 0004776169

ＣａＯ／Ａｌ２Ｏ３質量比が０．７のアルミナセメントを用い、アルミナセメントと無水セッコウ、硫酸アルミニウムの添加量を変えた以外は実施例１と同様に行った。結果を表４に示す。 This was carried out in the same manner as in Example 1 except that an alumina cement having a CaO / Al 2 O 3 mass ratio of 0.7 was used and the addition amounts of alumina cement, anhydrous gypsum and aluminum sulfate were changed. The results are shown in Table 4.

Figure 0004776169
Figure 0004776169

ＣａＯ／Ａｌ２Ｏ３質量比が０．７のアルミナセメントを用い、アルミナセメントと無水セッコウ、硫酸アルミニウムの添加量を変えて、実施例４と同様にセメント組成物を作製した。セメント組成物と等量の木質材を配合したものをフラット板上に散布し、８０℃、４Ｎ／ｍｍ２で加圧して一次硬化させた。その後、１６０℃、１２時間オートクレーブ養生して３０×３０×１ｃｍの木質セメント板を作製した。結果を表５に示す。 A cement composition was prepared in the same manner as in Example 4 by using alumina cement having a CaO / Al 2 O 3 mass ratio of 0.7 and changing the addition amounts of alumina cement, anhydrous gypsum and aluminum sulfate. A mixture of a cement composition and an equal amount of a wood material was sprayed on a flat plate and pressurized at 80 ° C. and 4 N / mm 2 for primary curing. Then, the autoclave curing was performed at 160 ° C. for 12 hours to produce a 30 × 30 × 1 cm wood cement board. The results are shown in Table 5.

〈使用材料〉
木質材：カラマツ材 <Materials used>
Wood material: larch

Figure 0004776169
Figure 0004776169

Claims (3)

ＣａＯ／Ａｌ ２ Ｏ ３ 質量比が０．５〜１．０であるアルミナセメント、無水セッコウ及び硫酸アルミニウムからなり、アルミナセメント／無水セッコウの質量比が２０／８０〜８０／２０であり、かつ、アルミナセメントと無水セッコウのブレーン比表面積が４０００〜８０００cm 2 /gであることを特徴とする木質セメント板用硬化促進材。 It consists of alumina cement , anhydrous gypsum and aluminum sulfate with a CaO / Al 2 O 3 mass ratio of 0.5 to 1.0, the mass ratio of alumina cement / anhydrous gypsum being 20/80 to 80/20, and A hardening accelerator for a wood cement board, wherein the specific surface area of alumina cement and anhydrous gypsum is 4000 to 8000 cm 2 / g . セメント１００質量部に対して、アルミナセメントと無水セッコウを合計で０．１〜２０質量部、硫酸アルミニウムを１〜１０質量部含有することを特徴とする、セメントと請求項１記載の木質セメント板用硬化促進材を含有してなるセメント組成物。 2. The cement and woody cement board according to claim 1 , comprising 0.1 to 20 parts by mass of alumina cement and anhydrous gypsum and 1 to 10 parts by mass of aluminum sulfate with respect to 100 parts by mass of cement. A cement composition comprising a curing accelerator for a machine . 請求項２記載のセメント組成物と木質材を配合し、８０℃、４Ｎ／ｍｍ ２ で加圧して一次硬化させ後、１６０℃、１２時間オートクレーブ養生することを特徴とする木質セメント板の製造方法。

A method for producing a wood cement board , comprising blending the cement composition according to claim 2 and a wood material, pressurizing at 80 ° C. and 4 N / mm 2 for primary curing, and then curing at 160 ° C. for 12 hours. .

JP2004003565A 2004-01-09 2004-01-09 Hardening accelerator for wood cement board Expired - Fee Related JP4776169B2 (en)

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