JP2005263567A - Method for producing high-strength centrifugally molded article and high-strength centrifugally molded article produced thereby - Google Patents

Method for producing high-strength centrifugally molded article and high-strength centrifugally molded article produced thereby Download PDF

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JP2005263567A
JP2005263567A JP2004079427A JP2004079427A JP2005263567A JP 2005263567 A JP2005263567 A JP 2005263567A JP 2004079427 A JP2004079427 A JP 2004079427A JP 2004079427 A JP2004079427 A JP 2004079427A JP 2005263567 A JP2005263567 A JP 2005263567A
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centrifugal force
portland cement
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binder
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JP4141976B2 (en
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Yoshiharu Watanabe
芳春 渡邉
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Denki Kagaku Kogyo Kk
電気化学工業株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifugally molded article having a larger introduced prestress, a high crazing load, high durability, and high strength of at least 100 N/mm<SP>2</SP>(in terms of design strength) and to provide a method for producing the same. <P>SOLUTION: The method for producing a high-strength centrifugally molded article comprises mixing high-early-strength or ultrahigh-early-strength portland cement having a unit weight below 400 kg/m<SP>3</SP>with a blast furnace slag powder or with both a blast furnace slag powder and normal portland cement to form a binder comprising the cement, the blast furnace slag powder, and the normal portland cement and having a unit weight of 450 to 650 kg/m<SP>3</SP>; adding a high performance water reducing agent to the mixture to give green concrete having a water-to-binder ratio of 30% or below; and centrifugally molding the concrete, followed by heat curing. In one embodiment of this method, 10-40 pts. wt. blast furnace slag powder is used per 100 pts. wt. binder. In another embodiment of this method, a gypsum and/or silica fume is used in addition to the above components. The high-strength centrifugally molded article and the high-strength centrifugally molded article having compressive strength of 100 N/mm<SP>2</SP>or higher in terms of a design strength are provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、高強度遠心力成型製品の製造方法およびその高強度遠心力成型製品に関し、特に、圧縮強度が設計基準強度で100N/mm2以上のコンクリート杭、鋼管複合杭、推進管、及びポールなどの高強度遠心力成型製品の製造方法およびその高強度遠心力成型製品に関する。 The present invention relates to a method for producing a high-strength centrifugal force molded product and the high-strength centrifugal force molded product, and in particular, a concrete pile, a steel pipe composite pile, a propulsion pipe, and a pole having a compressive strength of 100 N / mm 2 or more as a design standard strength. The present invention relates to a method for producing a high-strength centrifugal force molded product such as the above and a high-strength centrifugal force molded product.
従来、高強度遠心力成型製品を製造するには、普通ポルトランドセメントに石膏及び/又はシリカフュームなどの高強度混和材が使用され、設計基準強度80〜85N/mm2の高強度杭や推進管等の遠心力成型製品が実用化されている(非特許文献1参照)。
しかしながら、より高強度を得るために水結合材比を小さくすると、振動成型した供試体では設計基準強度で100N/mm2以上の強度は容易に得られるが、遠心力成型すると、水結合材比を小さくすればするほど脱水性が悪くなると同時に、遠心力による骨材の分離があるために、設計基準強度で100N/mm2以上の強度を有する高強度遠心力成型製品の実用化は困難であるという課題がある。
Conventionally, in order to produce high-strength centrifugal molded products, high-strength admixtures such as gypsum and / or silica fume are usually used for Portland cement, and high-strength piles and propulsion pipes with a design standard strength of 80 to 85 N / mm 2 Centrifugal force molded products have been put into practical use (see Non-Patent Document 1).
However, if the water binder ratio is reduced in order to obtain higher strength, the vibration molded specimen can easily obtain a strength of 100 N / mm 2 or more in the design standard strength, but if centrifugal force molding is performed, the water binder ratio The smaller the size, the worse the dehydration, and the separation of aggregates due to centrifugal force, making it difficult to put into practical use a high-strength centrifugal force molded product with a design standard strength of 100 N / mm 2 or more. There is a problem that there is.
さらに前記高強度混和材を使用しないで高強度遠心力成型製品を製造する方法として、ポリカルボン酸塩系減水剤を使用し、早強ポルトランドセメントや超早強ポルトランドセメントの単位量を400〜600kg/m3とし、水セメント比を32%以下、又は、20〜28%とすることも提案されている(特許文献1参照)。
しかしながらこの方法では、早強ポルトランドセメントや超早強ポルトランドセメントは粉末度が大きいため保水性が高く、遠心力成型による脱水性が悪くなるだけでなく、内面には締まらない軟らかいペースト層が残るために、ペースト層が厚くなるほど遠心力成型体としての強度は低くなる。
また、早強ポルトランドセメントなどの水硬性の高いセメントは、初期強度は高くなるが、その後の強度の伸びが停滞し、その遠心力成型体では設計基準強度100N/mm2以上の高強度は得られ難いという課題がある。
Furthermore, as a method for producing a high-strength centrifugal force molded product without using the high-strength admixture, a polycarboxylate-based water reducing agent is used, and the unit amount of early-strength Portland cement or ultra-early-strength Portland cement is 400 to 600 kg. / and m 3, the water-cement ratio of 32% or less, or, also proposed are (see Patent Document 1) be 20 to 28%.
However, with this method, early-strength Portland cement and super-early-strength Portland cement have a high degree of fineness, so water retention is high, and not only dehydration by centrifugal force molding is deteriorated, but also a soft paste layer that does not tighten is left on the inner surface. In addition, as the paste layer becomes thicker, the strength as a centrifugal force molded body becomes lower.
Further, a high hydraulic cement such as high-early-strength Portland cement, early strength is increased, then the elongation stagnant strength, obtained high strength design strength 100 N / mm 2 or more at its centrifugal force molded There is a problem that it is difficult to be done.
さらに、この方法に、前記高強度混和材を併用しても、高強度混和材を配合した分、粉体量が多くなるため、遠心力成型性はむしろ悪くなり、前記同様に早強ポルトランドセメントなどの水硬性の高いセメントは、初期強度が高くなるためにその後の強度の伸びが停滞し、設計基準強度で100N/mm2以上の高強度遠心力成型製品の製造は困難であるという課題がある。 Furthermore, even if the high-strength admixture is used in combination with this method, the amount of powder increases by the amount of the high-strength admixture, so the centrifugal force moldability is rather deteriorated. high hydraulic cement, such as, subsequent strength elongation is stagnant for initial strength is high, the problem that the production of 100 N / mm 2 or more high intensity centrifugal force molded product on design strength is difficult is there.
特開平07−304014号公報Japanese Patent Laid-Open No. 07-304014
本発明は、種々検討した結果、水硬性の高い早強ポルトランドセメント又は超早強ポルトランドセメントに、高炉スラグ粉末、又は、高炉スラグ粉末と普通ポルトランドセメントとを配合することにより、遠心力成型性を高め、設計基準強度で100N/mm2以上の高強度遠心力成型製品が製造できることを知見し、本発明を完成させたものである。 As a result of various investigations, the present invention has shown that centrifugal force formability is improved by blending blast furnace slag powder, or blast furnace slag powder and ordinary Portland cement, with early hydraulic strong Portland cement or ultra-high early strength Portland cement. It has been found that a high strength centrifugal force molded product having a design standard strength of 100 N / mm 2 or more can be manufactured, and the present invention has been completed.
本発明が解決しようとする課題は、高強度遠心力成型製品の製造方法およびその高強度遠心力成型製品を提供するものであり、特に、圧縮強度が設計基準強度で100N/mm2以上の高強度遠心力成型製品の製造方法およびその高強度遠心力成型製品を提供するものである。 An object of the present invention is to provide is to provide a manufacturing method and a high-strength centrifugal force molded product of high strength centrifugal molding products, in particular, the compression strength design strength 100 N / mm 2 or more high The present invention provides a method for producing a high strength centrifugal molded product and a high strength centrifugal molded product.
本発明は、単位量400kg/m3未満の早強ポルトランドセメント又は超早強ポルトランドセメントに、高炉スラグ粉末を、又は、高炉スラグ粉末と普通ポルトランドセメントとを配合し、早強ポルトランドセメント又は超早強ポルトランドセメントと、高炉スラグ粉末と、普通ポルトランドセメントとからなる結合材の単位量を450〜650kg/m3とし、高性能減水剤を併用して水結合材比30%以下としたコンクリートを遠心力成型し、加熱養生を行なう高強度遠心力成型製品の製造方法であり、高炉スラグ粉末が、結合材100部中、10〜40部である該高強度遠心力成型製品の製造方法であり、さらに、石膏類及び/又はシリカフュームを併用する該高強度遠心力成型製品の製造方法であり、石膏類が、結合材100部に対して、CaSO4換算で15部以下である該高強度遠心力成型製品の製造方法であり、シリカフュームが、結合材100部に対して、15部以下である該高強度遠心力成型製品の製造方法であり、該高強度遠心力成型製品の製造方法で製造された高強度遠心力成型製品であり、圧縮強度が設計基準強度で100N/mm2以上である該高強度遠心力成型製品である。 In the present invention, a blast furnace slag powder or a blast furnace slag powder and a normal Portland cement are blended with an early strong Portland cement or an ultra early strong Portland cement having a unit amount of less than 400 kg / m 3, and an early strong Portland cement or an Centrifugal concrete with a unit of 450 to 650 kg / m 3 of binder consisting of strong Portland cement, blast furnace slag powder, and ordinary Portland cement, and a water binder ratio of 30% or less using a high-performance water reducing agent. It is a method for producing a high-strength centrifugal force molded product that is force-molded and heat-cured, and the blast furnace slag powder is 10 to 40 parts in 100 parts of a binding material, Furthermore, a gypsum and / or high-strength centrifugal molding product manufacturing method of a combination of silica fume, the high strength gypsum is, relative to the binder 100 parts, more than 15 parts by CaSO 4 terms It is a manufacturing method of a heart force molded product, the silica fume is a manufacturing method of the high-strength centrifugal force molded product that is 15 parts or less with respect to 100 parts of the binder, and manufactured by the manufacturing method of the high-strength centrifugal force molded product The high-strength centrifugal force molded product, which has a compressive strength of 100 N / mm 2 or more in terms of design standard strength.
以下、本発明を詳しく説明する。
本発明で使用する部や%は特に規定のない限り質量基準である。
The present invention will be described in detail below.
Parts and% used in the present invention are based on mass unless otherwise specified.
本発明は、早強ポルトランドセメント又は超早強ポルトランドセメント(以下、早強ポセ類という)に、高炉スラグ粉末を、又は、高炉スラグ粉末と普通ポルトランドセメントとを配合して結合材として使用するものである。   In the present invention, blast furnace slag powder or blend of blast furnace slag powder and ordinary Portland cement is used as a binder in early strong Portland cement or ultra-early strong Portland cement (hereinafter referred to as early strong Poses). It is.
早強ポセ類の単位量は、400kg/m3未満であり、300〜390kg/m3が好ましい。400kg/m3以上では粉末度が大きいために、脱水性等の遠心力成型性が悪く、遠心力成型体の強度は高くならず、同一スランプを得るための高性能減水剤の使用量も増加して不経済となる場合がある。また、早強ポセ類の単位量が300kg/m3未満と少なすぎると、遠心力成型性は良くなるが、結合材全体の水硬性が弱くなるため、目的とする強度は得られ難くなる場合がある。 Unit amount of early-strength Pose compound is less than 400kg / m 3, 300~390kg / m 3 is preferred. At 400 kg / m 3 or more, the fineness is high, so the centrifugal force moldability such as dehydration is poor, the strength of the centrifugal force molded body is not high, and the amount of high-performance water reducing agent used to obtain the same slump increases. Can be uneconomical. In addition, if the unit amount of early strong Pose is less than 300 kg / m 3 , centrifugal force moldability will be improved, but the hydraulic strength of the whole binder will be weakened, making it difficult to obtain the desired strength There is.
本発明では、早強ポセ類に、高炉スラグ粉末を、又は、高炉スラグ粉末と普通ポルトランドセメントとを配合して結合材とする。
結合材の単位量は、450〜650kg/m3であり、470〜600kg/m3が好ましい。450kg/m3未満では高性能減水剤を最大限使用しても、設計基準強度で100N/mm2以上の高強度遠心力成型製品は得難い場合があり、650kg/m3を超えると強度は頭打ちとなり、経済的にも好ましくない場合がある。
In the present invention, the blast furnace slag powder or the blast furnace slag powder and ordinary Portland cement are blended with the early strong Pose to form a binder.
Unit amount of the binder is 450~650kg / m 3, 470~600kg / m 3 is preferred. Even less than 450 kg / m 3 by maximum use of the superplasticizer, 100 N / mm 2 or more high intensity centrifugal force molded product on design strength is sometimes difficult to obtain the strength exceeds 650 kg / m 3 is peaked In some cases, it is economically undesirable.
本発明で使用する高炉スラグ粉末(以下、スラグ粉という)は、高炉で鉄鋼石から銑鉄をつくる際に副生する溶融スラグを、水等により急冷し、粉砕又は粉砕・分級して得られる微粉末であり、JIS A 6206に規定されるものが好ましい。
スラグ粉の粉末度は、大きいほど潜在水硬性は高くなるため、強度的には好ましいが、通常、高炉セメントに使用されているブレーン比表面積値(以下、ブレーン値という)で4,000〜4,500cm2/g程度のスラグ粉の使用が可能である。
スラグ粉の使用量は、結合材100部中、10〜40部が好ましく、15〜35部がより好ましく、20〜30部が最も好ましい。
スラグ粉は、遠心力成型時の脱水性を高め遠心力成型体の強度を高めると共に、同一スランプを得るための高性能減水剤量を少なくする効果を有するが、スラグ粉が10部未満では、脱水性等の遠心力成型性が悪くなり、遠心力成型体の強度発現の改善効果も小さくなる場合があり、40部を超えると、結合材全体の水硬性が低下して、遠心力成型体の強度発現の改善効果も小さくなる場合がある。
The blast furnace slag powder used in the present invention (hereinafter referred to as slag powder) is a fine slag obtained by quenching molten slag produced as a by-product when making pig iron from iron ore in a blast furnace with water or the like and crushing or crushing / classifying it. A powder that is specified in JIS A 6206 is preferable.
The greater the fineness of the slag powder, the higher the potential hydraulic property, so it is preferable in terms of strength. However, it is usually 4,000 to 4,500 cm 2 in terms of the specific surface area of brain (hereinafter referred to as “brane value”) used in blast furnace cement. The use of slag powder of about / g is possible.
The amount of slag powder used is preferably 10 to 40 parts, more preferably 15 to 35 parts, and most preferably 20 to 30 parts in 100 parts of the binder.
Slag powder has the effect of reducing the amount of high-performance water reducing agent to obtain the same slump as well as increasing the strength of the centrifugal force molding by increasing the dewaterability during centrifugal molding, but if the slag powder is less than 10 parts, Centrifugal force moldability such as dehydration may deteriorate, and the effect of improving the strength expression of the centrifugal force molded body may be reduced. If it exceeds 40 parts, the hydraulic properties of the whole binder will be reduced, and the centrifugal force molded body In some cases, the effect of improving the strength development of the resin becomes small.
本発明で使用する普通ポルトランドセメント(以下、普通ポセという)は、早強ポルトランドセメント(以下、早強ポセという)などよりも水硬性は低いが、遠心力成型性は良い。また、スラグ粉よりは遠心力成型性は劣るが、水硬性が高いので、遠心力成型体の強度を高めるために適量を併用することが可能である。   The ordinary Portland cement (hereinafter referred to as ordinary strength) used in the present invention is lower in hydraulic properties than the early strong Portland cement (hereinafter referred to as early strength), but has a good centrifugal force moldability. Moreover, although centrifugal force moldability is inferior to slag powder, since hydraulic property is high, in order to raise the intensity | strength of a centrifugal force molded object, it is possible to use a suitable quantity together.
本発明では、早強ポセ類に、スラグ粉、又は、スラグ粉と普通ポセとを配合するが、早強ポセ類に、スラグ粉と普通ポセとを配合することは、コンクリート製品工場において、サイロを3本必要とするため、既に、JIS製品として普通ポセとスラグ粉を規定範囲量混合した高炉セメントが市販されているため、高炉セメントを使用する方が便利である。   In the present invention, slag powder or slag powder and ordinary posse are blended with early strong Pose, but blending slag powder and ordinary pose with early strong Pose is a silo in a concrete product factory. Therefore, it is more convenient to use blast furnace cement because JIS has already been commercially available as a JIS product.
本発明で使用する高性能減水剤は、比較的多量に添加しても遅延性がなく、空気連行性もない減水率の高い減水剤であり、一般的に、高性能AE減水剤と区別される。
また、高性能減水剤は、減水効果の他に遠心力成型性向上の効果も有し、通常の使用量の上限を超えて使用して、減水効果が頭打ちとなっても、遠心力成型性は向上する。
そして、高性能減水剤は、ポリアルキルアリルスルホン酸塩系、芳香族アミノスルホン酸塩系、及びメラミンホルマリン樹脂スルホン酸塩系のいずれかを主成分とするものであるが、本発明では、ポリアルキルアリルスルホン酸塩系や芳香族アミノスルホン酸塩系の高性能減水剤の一種又は二種以上が使用可能であり、メラミンホルマリン樹脂スルホン酸塩系の高性能減水剤は、遠心力成型性が悪く、高強度遠心力成型製品の製造には適さないものである。
ポリアルキルアリルスルホン酸塩系高性能減水剤には、メチルナフタレンスルホン酸ホルマリン縮合物、ナフタレンスルホン酸ホルマリン縮合物、及びアントラセンスルホン酸ホルマリン縮合物等があり、その市販品としては、電気化学工業(株)社製商品名「FT-500」又はそのシリーズ、花王(株)社商品名「マイティ-100」(粉末)や「マイティ-150」又はそのシリーズ、第一工業製薬(株)社商品名「セルフロー110P」(粉末)、竹本油脂(株)社商品名「ポールファイン510N」など、並びに、日本製紙(株)社商品名「サンフローPS」又はそのシリーズなどが代表的である。
芳香族アミノスルホン酸塩系高性能減水剤としては、藤沢薬品(株)社商品名「パリックFP200H」又はそのシリーズがある。
高性能減水剤の使用量は、結合材100部に対して、有効成分で0.6〜2.0部が好ましい。0.6部未満では減水率が小さく、2.0部を超えて使用しても減水率が頭打ちとなり、かつ、遠心力成型性の向上作用も頭打ちとなるため経済的にも好ましくない。
The high-performance water reducing agent used in the present invention is a water-reducing agent having a high water-reducing rate, which is not delayed even when added in a relatively large amount and does not have air entrainment, and is generally distinguished from a high-performance AE water-reducing agent. The
In addition to the water-reducing effect, the high-performance water reducing agent also has the effect of improving the centrifugal force moldability. Will improve.
The high performance water reducing agent is mainly composed of any one of polyalkylallyl sulfonate, aromatic amino sulfonate, and melamine formalin sulfonate. One or more alkyl allyl sulfonate and aromatic amino sulfonate high-performance water reducing agents can be used, and melamine formalin sulfonate high-performance water reducing agents have centrifugal moldability. Unfortunately, it is not suitable for manufacturing high strength centrifugal molded products.
The polyalkylallyl sulfonate-based high-performance water reducing agent includes methyl naphthalene sulfonic acid formalin condensate, naphthalene sulfonic acid formalin condensate, anthracene sulfonic acid formalin condensate, and the like. Product name "FT-500" or its series, Kao Corporation product name "Mighty-100" (powder) or "Mighty-150" or its series, Daiichi Kogyo Seiyaku Co., Ltd. product name Representative examples include “Cellflow 110P” (powder), Takemoto Yushi Co., Ltd. trade name “Pole Fine 510N”, and Nippon Paper Industries Co., Ltd. trade name “Sunflow PS” or a series thereof.
As an aromatic amino sulfonate-based high-performance water reducing agent, there is Fujisawa Pharmaceutical Co., Ltd. trade name “Palic FP200H” or its series.
The amount of the high-performance water reducing agent used is preferably 0.6 to 2.0 parts as an active ingredient with respect to 100 parts of the binder. If it is less than 0.6 parts, the water reduction rate is small, and even if it is used in excess of 2.0 parts, the water reduction rate reaches its peak, and the effect of improving the centrifugal force moldability also reaches its peak.
本発明において、石膏類及び/又はシリカフュームをさらに配合することにより、より高強度な遠心力成型製品が得られる。
石膏類は、二水石膏、半水石膏、II型の無水石膏、及びIII型無水石膏が使用されるが、特に、II型の無水石膏はより高強度を発現する面から好ましい。
II型の無水石膏は、天然産無水石膏、フッ酸発生時に副生するフッ酸石膏、及び他の形態の石膏を350℃以上の温度で熱処理したものが使用される。
石膏類の粉末度はセメントと同等以上であれば特に限定されるものではない。
石膏類の使用量は、結合材100部に対して、CaSO4換算で15部以下が好ましく、10部以下がより好ましく、1.5〜6部が最も好ましい。15超えて配合しても水結合材比が小さくなるほど未反応で残るようになるため遠心力成型体の強度は頭打ちとなる。また、1.5部未満では遠心力成型体の強度の増加は小さいため好ましくない。
In the present invention, a centrifugal strength molded product with higher strength can be obtained by further blending gypsum and / or silica fume.
As the gypsum, dihydrate gypsum, hemihydrate gypsum, type II anhydrous gypsum, and type III anhydrous gypsum are used. In particular, type II anhydrous gypsum is preferable from the viewpoint of developing higher strength.
As type II anhydrous gypsum, natural anhydrous gypsum, hydrofluoric acid gypsum by-produced when hydrofluoric acid is generated, and other forms of gypsum heat-treated at a temperature of 350 ° C. or higher are used.
The fineness of gypsum is not particularly limited as long as it is equal to or higher than that of cement.
The amount of gypsum used is preferably 15 parts or less, more preferably 10 parts or less, and most preferably 1.5 to 6 parts in terms of CaSO 4 with respect to 100 parts of the binder. Even if blended in excess of 15, as the water binder ratio becomes smaller, it remains unreacted, so the strength of the centrifugally molded product reaches its peak. On the other hand, if it is less than 1.5 parts, the increase in the strength of the centrifugally molded product is small, which is not preferable.
シリカフューム(以下、SFという)は、金属シリコンやシリコン合金を電気炉で製造するときに発生する非晶質の球形の超微粉であり、遠心力成型体の強度を高める。
SFの使用量は、結合材100部に対して、15部以下が好ましく、12部以下がより好ましく、2〜10部が最も好ましい。15部を超えて配合しても、遠心力成型性は悪くなるため遠心力成型体の強度も頭打ちとなるため好ましくない。また、2部未満では遠心力成型体の強度の増加は小さいため好ましくない。
また、石膏類とSFを併用して配合する場合は、石膏類とSFの合計で30部以下であるが、それぞれの好ましい量やより好ましい量の合計量でよく、両成分を併用添加するほうが効率よく高強度遠心力成型製品が製造できる。
Silica fume (hereinafter referred to as SF) is an amorphous spherical ultrafine powder generated when metal silicon or a silicon alloy is produced in an electric furnace, and increases the strength of the centrifugally molded body.
The amount of SF used is preferably 15 parts or less, more preferably 12 parts or less, and most preferably 2 to 10 parts with respect to 100 parts of the binder. Even if it exceeds 15 parts, the centrifugal force moldability deteriorates, and the strength of the centrifugal force molded body reaches its peak, which is not preferable. On the other hand, if it is less than 2 parts, the increase in the strength of the centrifugal molded body is small, which is not preferable.
Moreover, when mix | blending gypsum and SF together, it is 30 parts or less in total of gypsum and SF, but the total amount of each preferable amount and a more preferable amount may be sufficient, and it is better to add both components together. A high-strength centrifugal force molded product can be manufactured efficiently.
水結合材比は、30%以下であり、29%以下が好ましい。水結合材比は、小さくするほど遠心力成型体の強度も高くなるが、高性能減水剤の能力から、17%前後が限界であり、それより小さくすると、単位結合材量が多くなりすぎ、作業性が悪くなると同時に、遠心力成型性も悪くなり、遠心力成型体の強度も頭打ちとなる場合がある。   The water binder ratio is 30% or less, preferably 29% or less. The smaller the water binder ratio, the higher the strength of the centrifugal molded body. However, due to the ability of the high-performance water reducing agent, the limit is around 17%. At the same time as workability deteriorates, the centrifugal force moldability also deteriorates, and the strength of the centrifugal force molded body may reach its peak.
本発明において、コンクリートを練り混ぜる際に、早強ポセ類、スラグ粉や普通ポセ、高性能減水剤、骨材、石膏類、SF、及び水等のミキサへの投入順序や練り混ぜ方法は特に限定されるものではなく、通常の方法が使用される。   In the present invention, when mixing concrete, the order of addition to the mixer, such as early-strength Pose, slag powder and ordinary Pose, high-performance water reducing agent, aggregate, gypsum, SF, and water, and the mixing method are particularly The usual method is used without limitation.
本発明において、高強度遠心力成型製品を製造する遠心力成型方法は、常法でよく、通常、コンクリートを軸方向に延ばす3G以下、コンクリートを型枠に遠心力で貼り付けたままでモルタルを軸方向に延ばす6〜10G、粗骨材を外側に移動させながら締め固める15〜25G、並びに、より強く締め固める30〜40Gの各段階を3〜5段階で組み合わせることが好ましい。   In the present invention, the centrifugal force molding method for producing a high-strength centrifugal force molded product may be a conventional method. Usually, the concrete is axially extended to 3G or less, and the mortar is axially attached to the mold with centrifugal force. It is preferable to combine the steps of 6 to 10G extending in the direction, 15 to 25G for compacting the coarse aggregate while moving to the outside, and 30 to 40G for compacting the coarse aggregate in 3 to 5 steps.
本発明の高強度遠心力成型製品は、遠心力成型した後は数時間の前養生を行った後に適度な温度勾配で昇温し、40℃以上の温度で加熱養生を行う。
加熱方法としては、通常の蒸気養生方法や、熱したオイルを配管に循環させて行う方法その他があるが、遠心力成型体両端の解放部を密閉しない場合は、蒸気養生を行う方法が好ましい。
養生温度が低い場合は時間を長くし、養生温度が高い場合は時間を短くすることができ、40〜50℃の養生温度で8〜10時間保持することが好ましく、60〜100℃の養生温度で4〜6時間保持することがより好ましく、70〜85℃の養生温度で5時間保持することが最も好ましい。そして、養生後は養生槽の中で翌日までゆっくり自然冷却する。
なお、100℃を超える高温高圧養生では、スラグ粉を配合するとアルミナ分が多くなり、その分、結晶形が立方体で、結合力が弱いハイドロガーネットを多く生成するようになり、遠心力成型体の強度が低下するため好ましくない。
その後は養生槽の中で翌日までゆっくり自然冷却するか、養生槽に保温性の良い蓋を乗せて40℃程度の温度で1晩養生することが好ましい。
The high-strength centrifugal force molded product of the present invention is precured for several hours after being subjected to centrifugal force molding, then heated at an appropriate temperature gradient, and heated at a temperature of 40 ° C. or higher.
As a heating method, there are a normal steam curing method, a method in which heated oil is circulated in a pipe, and the like, but a steam curing method is preferable when the open portions at both ends of the centrifugal force molded body are not sealed.
If the curing temperature is low, the time can be lengthened, and if the curing temperature is high, the time can be shortened. It is preferable to hold the curing temperature at 40-50 ° C for 8-10 hours, and the curing temperature is 60-100 ° C. It is more preferable to hold | maintain for 4 to 6 hours, and it is most preferable to hold | maintain for 5 hours at the curing temperature of 70-85 degreeC. And after curing, it naturally cools slowly in the curing tank until the next day.
In addition, in high-temperature and high-pressure curing exceeding 100 ° C, when slag powder is added, the amount of alumina increases, and as a result, the crystal form is cubic and many hydrogarnets with weak bonding strength are generated, and centrifugal force molded products This is not preferable because the strength is lowered.
After that, it is preferable to cool naturally slowly until the next day in the curing tank, or to cure the film overnight at a temperature of about 40 ° C. with a lid having good heat retention.
本発明の高強度遠心力成型製品の製造方法により、(1) 設計基準強度で100N/mm2以上の高強度遠心力成型製品が製造できるため、杭の場合は支持力が大きく取れ、杭の施工本数が減り経済的となる。また、プレストレスをより大きく導入できるため地震に対して強い、耐震性の杭の製造が可能となる。(2) 推進管(推進工法用ヒューム管)では推進延長距離が長くなり、工費が安価となる。(3) ポールではひびわれ荷重が大きくなり、高耐久性のポールの製造が可能となるなどの効果を奏する。 According to the manufacturing method of the high strength centrifugal force molded product of the present invention, (1) a high strength centrifugal force molded product with a design standard strength of 100 N / mm 2 or more can be manufactured. The number of installations is reduced and it becomes economical. Moreover, since prestress can be introduced more greatly, it is possible to manufacture earthquake-resistant piles that are strong against earthquakes. (2) Propulsion pipes (fume pipes for the propulsion method) have a longer propulsion extension distance and lower construction costs. (3) The pole has the effect of increasing the cracking load and making it possible to manufacture a highly durable pole.
以下、本発明を実施例にて詳細に説明するが、本発明はこれら実施例に限られるものではない。   EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited to these Examples.
表1に示す早強ポセ類、スラグ粉、普通ポセ、高炉セメント、高性能減水剤、及び水を用い、空気量1.5%で、単位粗骨材量を1,100kg/m3として1m3となるよう細骨材量を調節したコンクリート配合で、スランプ2〜10cmのコンクリートを調製した。
調製したコンクリートを、外径20cm×長さ30cmの円筒型枠に17.5kg詰め、初速1.5G×2分、低速3G×5分、中速I 8G×1分、中速II 15G×2分、及び高速35G×3分の条件で遠心力成型した。
遠心力成型した供試体は、遠心力成型後、4時間前養生してから、20〜80℃まで3時間で上げて、そのまま5時間保持してから蒸気を止め、養生槽の中でそのままゆっくり冷却し、翌日、脱型後、室内で気乾養生した。
遠心力成型後の遠心力成型供試体ののろ量を測定し、遠心力成型供試体の締まりを観察すると共に、圧縮強度を測定した。結果を表1に併記する。
なお、コンクリートの練り混ぜは、結合材、細骨材、及び粗骨材を30秒間空練りした後、水に高性能減水剤を溶解した練り混ぜ水を添加して3分間二軸ミキサで練り混ぜた。
Table 1 early strength Pose acids shown, slag powder, usually Pose, blast furnace cement, superplasticizer, and using water, air amount 1.5%, a 1 m 3 units coarse aggregate amount as 1,100 kg / m 3 A concrete with a slump of 2 to 10 cm was prepared with a concrete composition in which the amount of fine aggregate was adjusted.
17.5 kg of the prepared concrete is packed in a cylindrical frame with an outer diameter of 20 cm x length of 30 cm, initial speed 1.5G x 2 minutes, low speed 3G x 5 minutes, medium speed I 8G x 1 minute, medium speed II 15G x 2 minutes, And centrifugal force molding under conditions of high speed 35G × 3 minutes.
After the centrifugal force molding, the specimen molded by centrifugal force is cured for 4 hours, then raised to 20-80 ° C in 3 hours, held for 5 hours, then the steam is stopped, and slowly in the curing tank. After cooling and demolding the next day, it was air-dried indoors.
The amount of filtration of the centrifugal force molded specimen after centrifugal force molding was measured, the tightening of the centrifugal force molded specimen was observed, and the compressive strength was measured. The results are also shown in Table 1.
For concrete mixing, the binder, fine aggregate, and coarse aggregate are kneaded for 30 seconds, then mixed with high-performance water reducing agent dissolved in water and mixed for 3 minutes with a biaxial mixer. mixed.
<使用材料>
早強ポセ類:電気化学工業(株)社製、早強ポセ、密度3.12g/cm3
スラグ粉 :高炉スラグ粉末、粉砕品、ブレーン値4,500cm2/g、密度2.90g/cm3
普通ポセ :電気化学工業(株)社製、普通ポセ、密度3.16g/cm3
高炉セメント:電気化学工業(株)社製、密度3.03g/cm3、スラグ粉の含有率43%
石膏類 :不溶性無水石膏、天然産、ブレーン値5,000cm2/g、密度2.85g/cm3
SF :エルケム社製シリカフューム、密度2.44g/cm3
高性能減水剤:ポリアルキルアリルスルホン酸塩系高性能減水剤、市販品、粉末
細骨材 :砂、新潟県姫川産川砂、5mm下、密度2.62g/cm3
粗骨材 :砕石、新潟県姫川産砕石、5〜13mm、密度2.64g/cm3
<Materials used>
Early strong Pose: made by Denki Kagaku Kogyo Co., Ltd., early strong Pose, density 3.12g / cm 3
Slag powder: Blast furnace slag powder, ground product, brain value 4,500cm 2 / g, density 2.90g / cm 3
Normal Pose: manufactured by Denki Kagaku Kogyo Co., Ltd., normal Pose, density 3.16 g / cm 3
Blast furnace cement: Denki Kagaku Kogyo Co., Ltd., density 3.03g / cm 3 , slag powder content 43%
Gypsum: Insoluble anhydrous gypsum, natural product, brain value 5,000cm 2 / g, density 2.85g / cm 3
SF: silica fume manufactured by Elchem, density 2.44 g / cm 3
High-performance water reducing agent: polyalkylallyl sulfonate-based high-performance water reducing agent, commercially available, fine powder aggregate: sand, sand from Himekawa, Niigata Prefecture, 5 mm below, density 2.62 g / cm 3
Coarse aggregate: Crushed stone, crushed stone from Himekawa, Niigata Prefecture, 5-13mm, density 2.64g / cm 3
<試験方法>
のろ :ノロ発生量、cc/遠心力成型供試体1個分
締まり :遠心力成型供試体の内面状態の遠心力成型性、「良」は脱水して内面のペースト層は硬い、「やや良」はペースト層はダレないが軟らかい状態で張り付いており、ペースト層の締まりが悪い、及び「不良」はペーストが波打ち状態を示す
圧縮強度 :JIS A 1136 に準じて、室内で気乾養生した材齢28日の強度を測定
<Test method>
Noro: Noro generation, cc / centrifuge force test specimen tightened by one: Centrifugal force moldability of the centrifugal force test specimen, “good” is dehydrated and the paste layer on the inner surface is hard, “slightly good” "The paste layer does not sag but sticks in a soft state, the paste layer is poorly tightened, and" Poor "indicates that the paste shows a wavy state. Compressive strength in accordance with JIS A 1136: Air-dried indoors Measure strength at 28 days of age
表1より、結合材量を一定にし、水結合材比を29%一定とした場合、スラグ粉の含有率が多くなると脱水性が向上し、遠心力成型体の強度は高くなる。そして、スラグ粉が、結合材100部中、10〜40部で100N/mm2以上の強度が得られ、15〜35部がより高強度であり、20〜30部が最も強度が得られる。
この際、早強ポセは300kg/m3以上必要であり、390kg/m3を超える量を配合しても強度の伸びは期待できないことも示される(実験No.1- 3〜実験No.1- 9)。
結合材中のスラグ粉の含有率を一定とし、結合材の単位量を変えた場合では、結合材450kg/m3以上で100N/mm2が得られ、650kg/m3を超えると強度の伸びは頭打ちとなることが示され、470〜600kg/m3以上がより好ましい(実験No.1-10、実験No.1-14)。
また、水結合材比は小さくなれば、小さくなるほど遠心力成型体の強度も高くなることも示される(実験No.1-17〜実験No.1-22)。
From Table 1, when the amount of the binder is constant and the water binder ratio is constant at 29%, the dewaterability is improved and the strength of the centrifugal molded body is increased when the content of the slag powder is increased. The slag powder, in binder 100 parts, 100 N / mm 2 or more strength can be obtained in 10 to 40 parts of a high strength and more is 15 to 35 parts, most strength is obtained 20 to 30 parts.
At this time, it is shown that early strong Pose is required to be 300 kg / m 3 or more, and even if an amount exceeding 390 kg / m 3 is blended, it is not expected to increase strength (Experiment No. 1-3 to Experiment No. 1). -9).
When the content of slag powder in the binder is constant and the unit amount of the binder is changed, 100N / mm 2 is obtained at 450 kg / m 3 or more of the binder, and the strength is increased when it exceeds 650 kg / m 3. Is flattened out, more preferably 470 to 600 kg / m 3 or more (Experiment No. 1-10, Experiment No. 1-14).
Further, it is also shown that the strength of the centrifugal force molded body increases as the water binder ratio decreases (experiment No. 1-17 to experiment No. 1-22).
実施例1の実験No.1- 4のコンクリート配合を用いて、表2に示す無水石膏、SFを使用したこと以外は実施例1と同様に行った。結果を表2に併記する。
なお、遠心力成型体の強度は材齢7日で測定し、コンクリートのスランプが硬くなる場合や軟らかくなる場合は高性能減水剤量を加減した。
The same procedure as in Example 1 was performed except that anhydrous gypsum and SF shown in Table 2 were used using the concrete composition of Experiment No. 1-4 of Example 1. The results are also shown in Table 2.
The strength of the centrifugally molded product was measured at a material age of 7 days. When the concrete slump was hardened or softened, the amount of the high-performance water reducing agent was adjusted.
表2より、結合材100部に対して、無水石膏は1.5部以上、SFは2.0部以上で効果を発揮し、結合材中のスラグ粉の含有率を選択すると使用量が少なくても、材齢7日で、100N/mm2以上が得られるようになり、石膏類とSFを併用すると120N/mm2以上の強度も短期間で得られることも示される。 From Table 2, the effect is achieved with 1.5 parts or more of anhydrous gypsum and 2.0 parts or more of SF with respect to 100 parts of the binder, and if the content of slag powder in the binder is selected, even if the amount used is small, At the age of 7 days, 100 N / mm 2 or more can be obtained, and it is also shown that the strength of 120 N / mm 2 or more can be obtained in a short period when gypsum and SF are used together.

Claims (8)

  1. 単位量400kg/m3未満の早強ポルトランドセメント又は超早強ポルトランドセメントに、高炉スラグ粉末を配合し、早強ポルトランドセメント又は超早強ポルトランドセメントと、高炉スラグ粉末とからなる結合材の単位量を450〜650kg/m3とし、高性能減水剤を併用して水結合材比30%以下としたコンクリートを、遠心力成型し、加熱養生を行なうことを特徴とする高強度遠心力成型製品の製造方法。 The early strength portland cement or ultra-early-strength portland cement is less than the unit amount 400 kg / m 3, formulated with blast furnace slag powder, high-early-strength Portland cement or ultra-early-strength Portland cement, a unit amount of the binder consisting of blast furnace slag powder Of high-strength centrifugal force molded product, characterized in that concrete is made 450-650 kg / m 3 and combined with a high-performance water reducing agent, and the water binder ratio is 30% or less, centrifugally molded, and heat-cured. Production method.
  2. 単位量400kg/m3未満の早強ポルトランドセメント又は超早強ポルトランドセメントに、高炉スラグ粉末と普通ポルトランドセメントとを配合し、早強ポルトランドセメント又は超早強ポルトランドセメントと、高炉スラグ粉末と、普通ポルトランドセメントとからなる結合材の単位量を450〜650kg/m3とし、高性能減水剤を併用して水結合材比30%以下としたコンクリートを、遠心力成型し、加熱養生を行なうことを特徴とする高強度遠心力成型製品の製造方法。 Blast furnace slag powder and ordinary Portland cement are blended with early strong Portland cement or ultra-early strong Portland cement with a unit amount of less than 400 kg / m 3 , and early strong Portland cement or ultra-early strong Portland cement, blast furnace slag powder and ordinary The unit amount of the binder consisting of Portland cement is 450-650 kg / m 3 and the concrete with a water binder ratio of 30% or less using a high-performance water reducing agent is molded by centrifugal force and heat cured. A method for producing a high strength centrifugal molded product.
  3. 高炉スラグ粉末が、結合材100部中、10〜40部であることを特徴とする請求項1又は請求項2に記載の高強度遠心力成型製品の製造方法。   The method for producing a high-strength centrifugal force molded product according to claim 1 or 2, wherein the blast furnace slag powder is 10 to 40 parts in 100 parts of the binder.
  4. さらに、石膏類及び/又はシリカフュームを併用することを特徴とする請求項1〜3のうちの1項に記載の高強度遠心力成型製品の製造方法。   Furthermore, gypsum and / or silica fume are used together, The manufacturing method of the high intensity | strength centrifugal force molded product of Claim 1 characterized by the above-mentioned.
  5. 石膏類が、結合材100部に対して、CaSO4換算で15部以下であることを特徴とする請求項4に記載の高強度遠心力成型製品の製造方法。 The method for producing a high-strength centrifugal force molded product according to claim 4, wherein the plaster is 15 parts or less in terms of CaSO 4 with respect to 100 parts of the binder.
  6. シリカフュームが、結合材100部に対して、15部以下であることを特徴とする請求項4又は請求項5に記載の高強度遠心力成型製品の製造方法。   The method for producing a high-strength centrifugal force molded product according to claim 4 or 5, wherein the silica fume is 15 parts or less with respect to 100 parts of the binder.
  7. 請求項1〜6のうちの1項に記載の高強度遠心力成型製品の製造方法で製造された高強度遠心力成型製品。   A high-strength centrifugal force molded product produced by the method for producing a high-strength centrifugal force molded product according to claim 1.
  8. 圧縮強度が、設計基準強度で100N/mm2以上であることを特徴とする請求項7に記載の高強度遠心力成型製品。 The high strength centrifugal force molded product according to claim 7, wherein the compressive strength is 100 N / mm 2 or more in terms of design standard strength.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007269610A (en) * 2006-03-31 2007-10-18 Sumitomo Osaka Cement Co Ltd Concrete composition and concrete formed article obtained by using the same
JP2008007351A (en) * 2006-06-28 2008-01-17 Kao Corp Hydraulic composition for centrifugally molded hardened body
JP2011073969A (en) * 2011-01-19 2011-04-14 Sumitomo Osaka Cement Co Ltd Concrete composition and concrete molded body using the same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007269610A (en) * 2006-03-31 2007-10-18 Sumitomo Osaka Cement Co Ltd Concrete composition and concrete formed article obtained by using the same
JP2008007351A (en) * 2006-06-28 2008-01-17 Kao Corp Hydraulic composition for centrifugally molded hardened body
JP2011073969A (en) * 2011-01-19 2011-04-14 Sumitomo Osaka Cement Co Ltd Concrete composition and concrete molded body using the same

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