JP3161575B2 - Cement composition for autoclave curing - Google Patents
Cement composition for autoclave curingInfo
- Publication number
- JP3161575B2 JP3161575B2 JP29497594A JP29497594A JP3161575B2 JP 3161575 B2 JP3161575 B2 JP 3161575B2 JP 29497594 A JP29497594 A JP 29497594A JP 29497594 A JP29497594 A JP 29497594A JP 3161575 B2 JP3161575 B2 JP 3161575B2
- Authority
- JP
- Japan
- Prior art keywords
- mortar
- sio
- cement composition
- portland cement
- curing
- 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
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
- C04B28/18—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 mixtures of the silica-lime type
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
Landscapes
- 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)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、オートクレーブ養生に
よってポール、パイルなどの高強度コンクリート製品を
得るためのセメント組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement composition for obtaining high-strength concrete products such as poles and piles by autoclaving.
【０００２】[0002]
【従来の技術】普通ポルトランドセメントにシリカフュ
ームなどの超微粉（平均粒径＜１μｍ）を添加したセメ
ント組成物は低水セメント比で混練しオートクレーブ養
生すると高強度を発現することが知られている。2. Description of the Related Art It is known that a cement composition obtained by adding ultrafine powder (average particle size <1 μm) such as silica fume to ordinary Portland cement has a high strength when kneaded at a low water cement ratio and cured in an autoclave.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記セ
メント組成物に含まれるシリカフュームなどの超微粉は
凝集しやすく、フレッシュなモルタルやコンクリート内
での分散がうまくいかないと、十分な強度が得られな
い。また、十分な強度を得ようとすると、高価な超微粉
（特に、シリカフューム）や高価な混和剤（特に、高性
能ＡＥ減水剤）の使用量が増えるなどの問題があった。However, ultrafine powder such as silica fume contained in the above cement composition tends to agglomerate, and sufficient strength cannot be obtained unless it is well dispersed in fresh mortar or concrete. In addition, in order to obtain sufficient strength, there has been a problem that the amount of expensive ultrafine powder (especially, silica fume) or expensive admixture (especially, high-performance AE water reducing agent) is increased.
【０００４】[0004]
【課題を解決するための手段】本発明は、２ＣａＯ・Ｓ
ｉＯ2 を４５〜９０重量％含有するポルトランドセメン
トに対し、けい石粉をＣａＯ／ＳｉＯ2 （重量比）が
１．０〜２．０になるように添加したオートクレーブ養
生用セメント組成物に関するもので、シリカヒュームの
ような超微粉を用いずに高強度のモルタルまたはコンク
リートを得ることを可能とした。The present invention provides 2CaO.S.
The iO 2 to portland cement containing 45 to 90 wt%, a silicon stone powder CaO / SiO 2 (weight ratio) relates autoclave curing cement composition was added to a 1.0 to 2.0, High strength mortar or concrete can be obtained without using ultrafine powder such as silica fume.
【０００５】本発明において用いられるポルトランドセ
メントは、Ｃ2 Ｓ（２ＣａＯ・ＳｉＯ2 の略称）を４５
〜９０重量％含有する。それ以外の成分としてはＣ3 Ｓ
（３ＣａＯ・ＳｉＯ2 の略称）、Ｃ3 Ａ（３ＣａＯ・Ａ
ｌ2 Ｏ3 の略称）、Ｃ4 ＡＦ（４ＣａＯ・Ａｌ2 Ｏ3 ・
Ｆｅ2 Ｏ3 の略称）などの水硬性鉱物および石膏を含有
する。The Portland cement used in the present invention has C 2 S (abbreviation for 2CaO.SiO 2 ) of 45%.
９０90% by weight. Other components include C 3 S
(Abbreviation for 3CaO.SiO 2 ), C 3 A (3CaO.A
l 2 O 3 ), C 4 AF (4CaO.Al 2 O 3.
(Abbreviation of Fe 2 O 3 ) and gypsum.
【０００６】Ｃ2 Ｓの量が４５重量％未満ではオートク
レーブ養生によって十分な強度が得られない。また９０
重量％を越えるとオートクレーブ養生前にモルタルまた
はコンクリートを硬化させる時間が著しく長くなり望ま
しくない。ポルトランドセメントのブレーン比表面積は
２５００〜６０００ｃｍ2 ／ｇ、好ましくは３０００〜
５０００ｃｍ2 ／ｇである。If the amount of C 2 S is less than 45% by weight, sufficient strength cannot be obtained by autoclaving. Also 90
Exceeding the weight percentage undesirably increases the time for hardening the mortar or concrete before curing in an autoclave. Portland cement has a Blaine specific surface area of 2500-6000 cm 2 / g, preferably 3000-2000 cm 2 / g.
5000 cm 2 / g.
【０００７】本発明において、ポルトランドセメントに
添加されるけい石粉は、ＳｉＯ2 を８５重量％以上含有
し、Ａｌ2 Ｏ3 および／またはＦｅ2 Ｏ3 を１５重量％
未満含有する。けい石粉以外のＳｉＯ2 を含有する粉
体、例えばフライアッシュやメタカオリンなどはＡｌ2
Ｏ3 および／またはＦｅ2 Ｏ3 を１５重量％以上含有
し、けい石粉の代わりに用いるとＣ3 ＡＳＨ4 （３Ｃａ
Ｏ・Ａｌ2 Ｏ3 ・ＳｉＯ2・４Ｈ2 Ｏの略称）などの結
晶性の水和物が生成し強度が低下するので望ましくな
い。In the present invention, the silica powder added to Portland cement contains at least 85% by weight of SiO 2 and 15% by weight of Al 2 O 3 and / or Fe 2 O 3.
Less than. Powder containing SiO 2 other than silica stone powder, for example, such as fly ash and metakaolin Al 2
When O 3 and / or Fe 2 O 3 is contained in an amount of 15% by weight or more and used in place of silica powder, C 3 ASH 4 (3Ca
Crystalline hydrates such as O.Al 2 O 3 .SiO 2 .4H 2 O) are produced, and the strength is lowered, which is not desirable.
【０００８】本発明において、ポルトランドセメントに
添加されるけい石粉の平均粒径は２〜３０μｍ、好まし
くは２〜１０μｍである。平均粒径が２μｍ未満では粒
子が凝集しやすくなり、フレッシュなモルタルまたはコ
ンクリートの流動性が低下するので好ましくない。また
平均粒径が３０μｍを越えるとオートクレーブ養生によ
って十分な強度が得られない。[0008] In the present invention, the average particle size of silica stone powder added to Portland cement is 2 to 30 µm, preferably 2 to 10 µm. If the average particle size is less than 2 μm, the particles are likely to aggregate, and the fluidity of fresh mortar or concrete decreases, which is not preferable. If the average particle size exceeds 30 μm, sufficient strength cannot be obtained by autoclave curing.
【０００９】本発明のオートクレーブ養生用セメント組
成物のＣａＯ／ＳｉＯ2 （重量比）は、１．０〜２．０
の範囲である。１．０未満では石灰が不足してけい石粉
の反応が不十分となり強度が低下する。また２．０を越
えるとオートクレーブ養生によってα−Ｃ2 ＳＨ（α−
２ＣａＯ・ＳｉＯ2 ・Ｈ2 Ｏの略称）などの水和物が生
成し強度が低下するので望ましくない。The cement composition for curing an autoclave of the present invention has a CaO / SiO 2 (weight ratio) of 1.0 to 2.0.
Range. If it is less than 1.0, the lime is insufficient and the reaction of the silica powder becomes insufficient, and the strength decreases. On the other hand, when the value exceeds 2.0, α-C 2 SH (α-
2CaO · SiO 2 · H 2 O abbreviation) undesirable hydrate generated strength is reduced such.
【００１０】本発明のオートクレーブ養生用セメント組
成物を用いモルタルまたはコンクリートを混練する時
に、必要に応じて添加されるものとして混和剤が挙げら
れる。混和剤としては、ナフタリンスルホン酸系、リグ
ニンスルホン酸系、メラミンスルホン酸系およびポリカ
ルボン酸系などを主成分とする減水剤、ＡＥ減水剤、高
性能減水剤、高性能ＡＥ減水剤、流動化剤などが挙げら
れる。またモルタルまたはコンクリート中の空気量を調
整するために、ＡＥ助剤または消泡剤をこれらの混和剤
と併用してもよい。When kneading mortar or concrete using the cement composition for autoclave curing of the present invention, admixtures may be added as necessary. Examples of the admixture include a water reducing agent mainly containing naphthalenesulfonic acid, ligninsulfonic acid, melaminesulfonic acid, and polycarboxylic acid, an AE water reducing agent, a high performance water reducing agent, a high performance AE water reducing agent, and a fluidizer. Agents and the like. In order to adjust the amount of air in the mortar or concrete, an AE auxiliary or an antifoaming agent may be used in combination with these admixtures.
【００１１】本発明のオートクレーブ養生用セメント組
成物を用いたモルタルまたはコンクリートのオートクレ
ーブ養生温度としては、１５０〜２２０℃が好ましい。
オートクレーブ養生温度を高くするほど、短い時間で高
強度のモルタルまたはコンクリートを製造することがで
きる。しかし、２２０℃を越えると結晶性の水和物が生
成し強度が低下するので望ましくない。また１５０℃未
満では、十分な強度を得るための養生時間が著しく長く
なるので望ましくない。オートクレーブ養生時間は温度
によって異なるが、通常は１〜２４時間、好ましくは３
〜１８時間である。[0011] The autoclave curing temperature of mortar or concrete using the cement composition for autoclave curing of the present invention is preferably 150 to 220 ° C.
The higher the temperature of the autoclave curing, the faster the mortar or concrete of high strength can be produced. However, when the temperature exceeds 220 ° C., a crystalline hydrate is formed and the strength is lowered, which is not desirable. On the other hand, if the temperature is lower than 150 ° C., the curing time for obtaining a sufficient strength becomes extremely long, which is not desirable. Although the autoclave curing time varies depending on the temperature, it is usually 1 to 24 hours, preferably 3 hours.
~ 18 hours.
【００１２】オートクレーブ養生の前にセメントの硬化
を促進させるために蒸気養生を行ってもよい。蒸気養生
温度としては３０〜１００℃が好ましい。蒸気養生時間
を高くするほど短い養生時間でセメントは硬化するが、
高くしすぎるとモルタルまたはコンクリートの表面にク
ラックが発生しやすくなる。蒸気養生時間は通常２４時
間以内、好ましくは１８時間以内である。[0012] Prior to autoclaving, steam curing may be performed to accelerate the setting of the cement. The steam curing temperature is preferably from 30 to 100C. The higher the steam curing time is, the shorter the curing time is for the cement to harden,
If the height is too high, cracks tend to occur on the surface of the mortar or concrete. The steam curing time is usually within 24 hours, preferably within 18 hours.
【００１３】本発明においてモルタルおよびコンクリー
トを製造する時に用いる細骨材および粗骨材の種類およ
び配合量は、特に限定されるものでなく、通常のモルタ
ルおよびコンクリートを製造する時に用いるものでもよ
い。In the present invention, the types and amounts of fine aggregate and coarse aggregate used in producing mortar and concrete are not particularly limited, and those used in producing ordinary mortar and concrete may be used.
【００１４】[0014]
【実施例】次に、本発明を実施例により詳しく説明す
る。Next, the present invention will be described in detail with reference to examples.
【００１５】実施例、比較例および参考例の各例で使用
した細骨材および混和剤の種類、モルタルの配合および
混練、養生条件は次のとおりである。The types of fine aggregates and admixtures used in each of the Examples, Comparative Examples and Reference Examples, and the mixing, kneading and curing conditions of the mortar are as follows.
【００１６】細骨材：福島県相馬郡産砕砂（粗粒率：
２．７２） 混和剤：ポリカルボン酸系高性能ＡＥ減水剤〔サンフロ
ー・ＨＳ−７００（サンフロー株式会社製）〕 配 合：細骨材／（ポルトランドセメント＋混和材）の
容積比：１．７〔但し、混和材＝けい石粉、フライアッ
シュ、メタカオリン、シリカフューム〕 水／（ポルトランドセメント＋混和材）の重量比：０．
２５ 混和剤使用量：混練直後のモルタルフロー値（ＪＩＳ
Ｒ ５２０１に従う）が２００±１０ｍｍになるように
調整。 混 練：ポルトランドセメント、混和材、混和剤、水お
よび細骨材を大気圧下および減圧下でそれぞれ３分間混
練した。 養 生：混練したモルタルを以下の条件で養生した。 前養生：２０℃、５時間 蒸気養生：６５℃、５時間 オートクレーブ養生：１８０℃、５時間Fine aggregate: crushed sand from Soma-gun, Fukushima Prefecture (coarse grain ratio:
2.72) Admixture: Polycarboxylic acid-based high-performance AE water reducer [Sanflow HS-700 (manufactured by Sunflow)] Mixing: Fine aggregate / (Portland cement + admixture) volume ratio: 1 0.7 [However, admixture = silica powder, fly ash, metakaolin, silica fume] Weight ratio of water / (Portland cement + admixture): 0.7.
25 Use amount of admixture: Mortar flow value immediately after kneading (JIS
R5201) is adjusted to be 200 ± 10 mm. Kneading: Portland cement, admixture, admixture, water and fine aggregate were kneaded under atmospheric pressure and reduced pressure for 3 minutes, respectively. Curing: The kneaded mortar was cured under the following conditions. Pre-curing: 20 ° C, 5 hours Steam curing: 65 ° C, 5 hours Autoclave curing: 180 ° C, 5 hours
【００１７】各例で使用した混和材の化学組成を表１に
示す。Table 1 shows the chemical composition of the admixture used in each example.
【００１８】[0018]
【表１】 [Table 1]
【００１９】実施例１〜２ Ｃ2 Ｓ量を５２重量％含有するポルトランドセメントに
対し、けい石粉をＣａＯ／ＳｉＯ2 （重量比）が１．６
になるように添加してモルタルを調製した。ポルトラン
ドセメントのブレーン比表面積は３５５０ｃｍ2 ／ｇと
した。ポルトランドセメントの比重および鉱物組成、け
い石粉の比重、平均粒径およびセメントへの添加量（内
割）、ＣａＯ／ＳｉＯ2 （重量比）およびモルタル圧縮
強さを表２に示す。モルタル圧縮強さ試験では直径５ｃ
ｍ、高さ１０ｃｍの円柱供試体を使用した。圧縮強さ試
験はＪＩＳ Ａ １１０８に準じ、オートクレーブ養生
後６時間以内に行った。Examples 1-2 The silica powder had a CaO / SiO 2 (weight ratio) of 1.6 with respect to Portland cement containing 52% by weight of C 2 S.
To prepare a mortar. The Blaine specific surface area of the Portland cement was 3550 cm 2 / g. Table 2 shows the specific gravity and mineral composition of Portland cement, the specific gravity of silica stone powder, the average particle size, the amount added to the cement (inner percentage), CaO / SiO 2 (weight ratio), and the mortar compressive strength. 5c diameter in mortar compressive strength test
A cylindrical specimen having a height of 10 cm and a height of 10 cm was used. The compression strength test was performed within 6 hours after autoclaving according to JIS A 1108.
【００２０】比較例１〜２ ポルトランドセメントに対するけい石粉の添加量を変え
てセメント組成物のＣａＯ／ＳｉＯ2 （重量比）を代え
た以外は実施例２と同様である。その結果を表２に示
す。ＣａＯ／ＳｉＯ2 （重量比）が本発明の範囲を外れ
ると、モルタル圧縮強さは大きく低下する。Comparative Examples 1-2 The same as Example 2 except that the amount of silica powder added to Portland cement was changed to change the CaO / SiO 2 (weight ratio) of the cement composition. Table 2 shows the results. When the CaO / SiO 2 (weight ratio) is out of the range of the present invention, the mortar compressive strength is greatly reduced.
【００２１】比較例３〜６ Ｃ2 Ｓ量が２０重量％のポルトランドセメント（普通ポ
ルトランドセメント）を使用した以外は、実施例２と同
様である。その結果を表２に示す。表２から分かるよう
に、従来の普通ポルトランドセメントを使用した場合に
は、けい石粉の添加量を変えてもオートクレーブ養生し
たモルタルの圧縮強さは、実施例２に及ばない。Comparative Examples 3 to 6 The same as Example 2 except that Portland cement (normal Portland cement) having a C 2 S content of 20% by weight was used. Table 2 shows the results. As can be seen from Table 2, when conventional ordinary Portland cement is used, the compressive strength of the mortar that has been cured in an autoclave is inferior to that of Example 2 even when the amount of silica powder added is changed.
【００２２】[0022]
【表２】 [Table 2]
【００２３】比較例７〜９ けい石粉の代わりにフライアッシュ、メタカオリンおよ
びシリカフュームを使用し、実施例２と同様にポルトラ
ンドセメントへの添加量（内割）を１５容積％とした。
その結果を表３に示す。フライアッシュおよびメタカオ
リンを添加した場合のモルタルの圧縮強さは、無添加の
場合（比較例１）よりも著しく低い。Comparative Examples 7 to 9 Instead of silica powder, fly ash, metakaolin and silica fume were used, and the amount of addition (portion) to Portland cement was 15% by volume in the same manner as in Example 2.
Table 3 shows the results. The compressive strength of the mortar when fly ash and metakaolin were added was significantly lower than the case where no mortar was added (Comparative Example 1).
【００２４】参考例１（従来例） 普通ポルトランドセメントに対し、超微粉であるシリカ
フュームを添加してモルタルを調製した。その結果を表
３に示す。モルタル中での分散がうまくいかないため
か、十分な強度が得られていない。Reference Example 1 (Conventional Example) A mortar was prepared by adding silica fume as an ultrafine powder to ordinary Portland cement. Table 3 shows the results. Sufficient strength has not been obtained, possibly due to poor dispersion in the mortar.
【００２５】[0025]
【表３】 [Table 3]
【００２６】[0026]
【発明の効果】本発明のオートクレーブ養生用セメント
組成物を用いてオートクレーブ養生すると、高強度のモ
ルタルまたはコンクリートが短期間に得られる。本発明
で用いられるけい石粉は、シリカフュームのような超微
粉（＜１μｍ）でないので、フレッシュなモルタルまた
はコンクリート中で分散しやすく分散不良による強度低
下が起こりにくい。また高価なシリカフュームを使用し
ていないので、従来の普通ポルトランドセメントとシリ
カフュームを用いる場合に比べて経済的なメリットも大
きい。When the autoclave-curing cement composition of the present invention is used for autoclave curing, a high-strength mortar or concrete can be obtained in a short time. Since the silica powder used in the present invention is not an ultrafine powder (<1 μm) such as silica fume, it is easily dispersed in fresh mortar or concrete, and the strength is not easily reduced due to poor dispersion. Further, since expensive silica fume is not used, there is a great economical advantage as compared with the case where conventional ordinary Portland cement and silica fume are used.
Claims (3)
有するポルトランドセメントに対し、けい石粉をＣａＯ
／ＳｉＯ2 （重量比）が１．０〜２．０になるように添
加したオートクレーブ養生用セメント組成物。To 1. A Portland cement to 2CaO · SiO 2 containing 45 to 90 wt%, a silicon stone powder CaO
An autoclave curing cement composition added so that / SiO 2 (weight ratio) is 1.0 to 2.0.
請求項１記載のオートクレーブ養生用セメント組成物。2. The autoclave curing cement composition according to claim 1, wherein the silica powder has an average particle size of 2 to 30 μm.
Ａｌ2 Ｏ3 および／またはＦｅ2 Ｏ 3 を１５重量％未満
含有し、平均粒径が２〜３０μｍである請求項１記載の
オートクレーブ養生用セメント組成物。3. The method according to claim 1, wherein the silica powder is SiO.TwoAt least 85% by weight,
AlTwoOThreeAnd / or FeTwoO ThreeLess than 15% by weight
2. The composition according to claim 1, wherein the average particle size is 2 to 30 μm.
An autoclave curing cement composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29497594A JP3161575B2 (en) | 1994-11-29 | 1994-11-29 | Cement composition for autoclave curing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29497594A JP3161575B2 (en) | 1994-11-29 | 1994-11-29 | Cement composition for autoclave curing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08157242A JPH08157242A (en) | 1996-06-18 |
| JP3161575B2 true JP3161575B2 (en) | 2001-04-25 |
Family
ID=17814736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29497594A Expired - Lifetime JP3161575B2 (en) | 1994-11-29 | 1994-11-29 | Cement composition for autoclave curing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3161575B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7730996B2 (en) | 2006-04-12 | 2010-06-08 | Ocv Intellectual Capital, Llc | Long fiber thermoplastic composite muffler system with integrated crash management |
| US7934580B2 (en) | 2006-04-12 | 2011-05-03 | Ocv Intellectual Capital, Llc | Long fiber thermoplastic composite muffler system |
| US7942237B2 (en) | 2006-04-12 | 2011-05-17 | Ocv Intellectual Capital, Llc | Long fiber thermoplastic composite muffler system with integrated reflective chamber |
-
1994
- 1994-11-29 JP JP29497594A patent/JP3161575B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7730996B2 (en) | 2006-04-12 | 2010-06-08 | Ocv Intellectual Capital, Llc | Long fiber thermoplastic composite muffler system with integrated crash management |
| US7934580B2 (en) | 2006-04-12 | 2011-05-03 | Ocv Intellectual Capital, Llc | Long fiber thermoplastic composite muffler system |
| US7942237B2 (en) | 2006-04-12 | 2011-05-17 | Ocv Intellectual Capital, Llc | Long fiber thermoplastic composite muffler system with integrated reflective chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08157242A (en) | 1996-06-18 |
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