JP4554023B2 - Concrete composition for centrifugal molding - Google Patents
Concrete composition for centrifugal molding Download PDFInfo
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- JP4554023B2 JP4554023B2 JP2000063570A JP2000063570A JP4554023B2 JP 4554023 B2 JP4554023 B2 JP 4554023B2 JP 2000063570 A JP2000063570 A JP 2000063570A JP 2000063570 A JP2000063570 A JP 2000063570A JP 4554023 B2 JP4554023 B2 JP 4554023B2
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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
- C04B28/04—Portland 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C04B2103/0045—Polymers chosen for their physico-chemical characteristics
- C04B2103/0053—Water-soluble polymers
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/56—Compositions suited for fabrication of pipes, e.g. by centrifugal casting, or for coating concrete pipes
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Macromonomer-Based Addition Polymer (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は遠心成形コンクリート組成物に関する。
【０００２】
【従来の技術及び発明が解決しようとする課題】
高強度が要求されるパイル、ポール、ヒューム管等の遠心製品の中でも、パイルは60〜100N/mm2の強度を必要とする。この強度発現には、セメントの減水性を高めるナフタレン系分散剤が一般に使用される。しかし、減水性を高めるために分散剤の添加量を多くすると、コンクリートがダイラタンシー的な粘性挙動を示し、締め固めが不充分になることがある。この解決法として特開平8-12399号が提案されている。
【０００３】
しかし、より高強度化を進めるために配合されるけい酸質材料等の高強度材が粘性挙動を更に悪化させ、締め固めが不充分となる。
【０００４】
本発明の課題は、けい酸質材料等の高強度材の併用下においても、通常の遠心力による締め固めで十分な強度を示す遠心成形用コンクリート組成物を提供することである。
【０００５】
【課題を解決するための手段】
本発明は、セメント、高強度材及び混和剤としての水溶性共重合体を含有する遠心成型用コンクリート組成物であって、前記水溶性共重合体が炭素数２〜３のアルキレンオキシド（以下、AOと称す）を平均で２〜100モル付加したポリオキシアルキレン鎖を有する化合物からなるビニル系単量体(a)の１種以上と、カルボキシル基、スルホン酸基又はアミド基を有する化合物若しくはそれらの水溶性塩からなるビニル系単量体(b)の１種以上とを含有する単量体混合物を重合して得られる水溶性共重合体（以下、水溶性共重合体という）である遠心成形用コンクリート組成物に関する。
【０００６】
【発明の実施の形態】
本発明は、コンクリートの粘性挙動の検討から、特定の水溶性共重合体を添加することで、遠心力による締め固めに有効なコンクリート組成物が得られることを見出したものである。
【０００７】
本発明のコンクリート組成物は、高強度材を、セメント重量に対して、好ましくは３〜30重量％、より好ましくは５〜15重量％含有することで、高強度化が達成される。高強度材としては、水和反応によりトバモライト結晶もしくはエトリンガイト結晶を生成するものが好ましい。トバモライト結晶を生成するものとしては、けい酸質材料として、けい砂、フライアッシュ、シリカヒューム等が挙げられるが、通常けい砂が使用される。また、エトリンガイトを生成するものとしては、エフダック（電気化学社製）やデンカΣ1000、Σ5000、Σ6000、デンカCSA（電気化学社製）、小野田Σ1000（太平洋セメント社製）がある。
【０００８】
本発明において、ビニル系単量体(a)の炭素数２〜３のAOとは、エチレンオキシド（以下、EOと称す）とプロピレンオキシド（以下、POと称す）挙げられ、分散性能の点よりEOが好ましい。これらのAOの付加形態は、EO又はPOの単独付加、或いはランダム付加、ブロック付加、交互付加のいずれでもよい。単量体(a)においては、AOの導入付加モル数が平均で２〜100の範囲に於いてコンクリートの粘性状態が良く、更に５〜80、特に９〜50が優れる。
【０００９】
単量体(b)は、カルボキシル基、スルホン酸基、アミド基若しくはこれらの水溶性塩の１種以上を含有するビニル系単量体である。水溶性塩としてはナトリウム塩、カリウム塩、カルシウム塩、マグネシウム塩の金属塩や、アンモニウム塩、トリエタノールアミン塩、ジエタノールアミン塩、モノエタノールアミン塩等が挙げられる。
【００１０】
本発明において、単量体(a)としては下記一般式(A)で表される化合物が好ましく、単量体(b)としては一般式(B)又は(C)で表される化合物が好ましい。
【００１１】
【化３】
（式中、
R1，R2；水素原子又はメチル基
m1；０〜２の整数
AO；炭素数２〜３のオキシアルキレン基
n；２〜100の数
X；水素原子又は炭素１〜３のアルキル基
を表す。）
【００１３】
【化４】
（式中、
R3，R6；水素原子又はメチル基
R4，R5；水素原子、メチル基又は(CH2)m2COOM2であり、(CH2)m2COOM2はCOOM1又は他の(CH2)m2COOM2と無水物を形成していてもよく、その場合、それらの基のM1，M2は存在しない。
M1，M2，Y；水素原子、アルカリ金属原子、アルカリ土類金属原子、アンモニウム、水酸基が置換していてもよいアルキル（炭素数２〜８）アンモニウム
m2；０〜２の整数
を表す。）。
【００１５】
一般式(A)で示される単量体としては、メトキシポリエチレングリコール、メトキシポリエチレンポリプロピレングリコール、エトキシポリエチレングリコール、プロポキシポリエチレングリコール等の片末端アルキル基封鎖ポリアルキレングリコールとアクリル酸又はメタクリル酸とのエステル化物やアクリル酸又はメタクリル酸へのEO、PO付加物が用いられる。nはAO基の平均付加モル数であり、前記の範囲が好ましい。
【００１６】
また、一般式(A)のnが50〜100の単量体と一般式(A)のnが２〜50の単量体の併用や、更にnが100を超える単量体とnが２〜50の単量体の併用も、本発明の効果を損なわない限り可能である。
【００１７】
また一般式(B)で示される単量体としては、アクリル酸、メタクリル酸、クロトン酸、無水マレイン酸、マレイン酸、無水イタコン酸、イタコン酸、無水シトラコ酸、シトラコ酸、フマル酸、又はこれらのアルカリ金属塩、アルカリ土類金属塩、アンモニウム塩、水酸基が置換していてもよいアルキル（炭素数２〜８）アンモニウム塩が挙げられる。
【００１８】
また一般式(C)で示される単量体としては、アリルスルホン酸、メタリルスルホン酸、又はこれらのアルカリ金属塩、アルカリ土類金属塩、アンモニウム塩、水酸基が置換していてもよいアルキル（炭素数２〜８）アンモニウム塩が挙げられる。
【００１９】
本発明の水溶性共重合体は、上記一般式(A)〜(C)で表される単量体を用いたものが好ましい。該共重合体は、公知の方法で製造することができる。例えば、特開平7-223852号公報、特開平7-247150号公報、特開平11-157897号公報の溶液重合法が挙げられ、水や炭素数１〜４の低級アルコール中、過硫酸アンモニウム、過酸化水素等の重合開始剤存在下、要すれば、亜硫酸ナトリウムやメルカプトエタノール等を添加し、50〜100℃で0.5〜10時間反応させればよい。
【００２０】
なお本発明の効果を損なわない範囲で、上記単量体(A)〜(C)の他に、共重合可能な単量体を共重合してもよい。こうした単量体の例としては、アクリロニトリル、アクリルアミド、メタクリルアミド、スチレン等が挙げられる。
【００２１】
本発明に用いられる水溶性共重合体としては、上記単量体(A)〜(C)を用いるものの他に、アルケニルエーテルと無水マレイン酸の共重合体等が挙げられる。
【００２２】
水溶性共重合体を得るための単量体混合物中の単量体(a)と単量体(b)の比率は、単量体(a)／単量体(b)＝0.1／100〜200／100（モル比）であることがコンクリート粘性の状態に優れ、単量体(a)／単量体(b)＝10／100〜100／100（モル比）範囲が特に優れる。また、該単量体混合物中、単量体(a)と単量体(b)の合計は50〜100モル％、更に80〜100モル％、特に90〜100モル％であることが好ましい。
【００２３】
また、本発明の水溶性共重合体は、重量平均分子量（ゲルパーミエーションクロマトグラフィー法／標準物質ポリスチレンスルホン酸ナトリウム換算／水系）が5,000〜500,000、特に20,000〜100,000の範囲が分散性に優れる。
【００２４】
本発明の水溶性共重合体としては、メタノールのAO付加物と（メタ）アクリル酸、特にメタクリル酸のエステル(a1)と（メタ）アクリル酸、特にメタクリル酸(b1)の共重合体が好ましい。メタノールのAO平均付加モル数は前記nと同様の範囲が好ましい。また、モノマー比は、(a1)／(b1)＝５／100〜100／100（モル比）が好ましく、より好ましくは10／100〜50／100である。また、この共重合体を、全水溶性共重合体の20重量％以上、好ましくは40重量％含む混合物を使用することもできる。
【００２５】
本発明のコンクリート組成物は、水溶性共重合体を、セメント重量に対して0.01〜3.0重量％、特に0.1〜1.0重量％含有することが好ましい。
【００２６】
本発明コンクリート組成物は、早強セメント、高炉セメント等のセメント類を主成分とし、高強度材と混和剤としての水溶性共重合体とを含有するが、公知の添加剤（材）を併用することもできる。一例を挙げれば、消泡剤、増粘剤、防水剤、遅延剤、早強剤、促進剤、減水剤、高性能減水剤、起泡剤、発泡剤、ＡＥ剤、界面活性剤類等が挙げられる。
【００２７】
【実施例】
（１）水溶性共重合体
表１に、実施例及び比較例で用いた用いた水溶性共重合体を示す。それらのうち、No.１〜11は、特開昭59-162163号公報、特開平2-163108号公報、特開平7-223852号公報、特開平11-157897号公報等の記載に準じて製造したものである。EOはエチレンオキシド、POはプロピレンオキシドを表し、（ ）の次の数字は平均付加モル数である。水溶性共重合体No.９はブロック付加物である。また、水溶性共重合体の分子量は、ゲルパーミエーションクロマトグラフィー法（標準物質ポリスチレンスルホン酸ナトリウム換算／水系）により求めた重量平均分子量である。
【００２８】
【表１】
（２）コンクリート配合物
表２〜表４に実施例及び比較例で用いたコンクリートの配合を示す。
【００３０】
【表２】
【表３】
【表４】
（３）評価
＜コンクリートの締まり評価＞
表２〜表４に示すコンクリート配合に、表１の水溶性共重合体を、表５〜７の量で添加してスランプ値が５〜６cmとなるように調整し、内径20cm×高さ30cmの遠心成形用型枠にコンクリートを15kg投入して遠心締め固めを行った。ここで、スランプ値は、JIS−A1101の方法により測定した。締め固め時間によるコンクリート強度の測定とコンクリートの締まり程度を肉眼で観察した。
【００３４】
遠心条件は、５Ｇ（49ｍ/ｓ2）で１分、15Ｇ（147ｍ/ｓ2）で２分行い、次いで30Ｇ（294ｍ/ｓ2）で２分、４分、５分行ったときの締まり程度を以下の基準で観察した。
【００３５】
◎：内面平滑性良好且つ、平均的に締め固まっている
○：平均的に締め固まっている
△：内面又は外面の平滑性がやや悪い
×：砂利が露出し、内面又は外面の平滑性が悪い。
【００３６】
＜圧縮強度の評価＞
上記コンクリートの締まり評価において、コンクリート投入後の締め固めを30Ｇ（294ｍ/ｓ2）で３分行い、蒸気養生後又はオートクレーブ養生後に硬化体の圧縮強度をJIS−A1108法に準じて測定した。蒸気養生条件は、前置き２時間、20℃で１時間、65℃で５時間、徐令24時間とした。また、オートクレーブ養生条件は、前記蒸気養生24時間後の硬化体を180℃（10気圧）で６時間、徐冷24時間とした。測定結果を表５〜表７に示す。
【００３７】
【００３８】
【表６】
【表７】
【発明の効果】
本発明のコンクリート組成物は、遠心成形後の締め固めが良好であり、強度発現にも優れた効果を示す。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a centrifugally molded concrete composition.
[0002]
[Prior art and problems to be solved by the invention]
Piles high strength is required, pole, among centrifugal products such as Hume pipe, pile requires strength 60~100N / mm 2. In order to develop this strength, a naphthalene-based dispersant that increases the water reduction of cement is generally used. However, if the amount of the dispersant added is increased in order to increase water reduction, the concrete exhibits a dilatancy-like viscous behavior, and compaction may be insufficient. JP-A-8-12399 has been proposed as a solution to this problem.
[0003]
However, a high-strength material such as a siliceous material blended in order to further increase the strength further deteriorates the viscous behavior, resulting in insufficient compaction.
[0004]
The subject of this invention is providing the concrete composition for centrifugal forming which shows sufficient intensity | strength by the compaction by a normal centrifugal force also in the combined use of high strength materials, such as a siliceous material.
[0005]
[Means for Solving the Problems]
The present invention is a centrifugal molding concrete composition containing a cement, a high-strength material and a water-soluble copolymer as an admixture, wherein the water-soluble copolymer is an alkylene oxide having 2 to 3 carbon atoms (hereinafter, A compound having a carboxyl group, a sulfonic acid group or an amide group, or one or more kinds of vinyl monomers (a) composed of a compound having a polyoxyalkylene chain to which 2 to 100 moles of AO) is added on average Centrifugal is a water-soluble copolymer (hereinafter referred to as a water-soluble copolymer) obtained by polymerizing a monomer mixture containing at least one vinyl monomer (b) comprising a water-soluble salt of The present invention relates to a concrete composition for molding.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention has been found from the examination of the viscous behavior of concrete that a concrete composition effective for compaction by centrifugal force can be obtained by adding a specific water-soluble copolymer.
[0007]
The concrete composition of the present invention achieves high strength by containing a high-strength material, preferably 3 to 30% by weight, more preferably 5 to 15% by weight, with respect to the cement weight. As the high-strength material, a material that generates tobermorite crystals or ettringite crystals by a hydration reaction is preferable. Examples of materials that produce tobermorite crystals include siliceous sand, fly ash, silica fume, and the like as siliceous materials, but usually silica sand is used. Further, ettringite is produced by EFDAC (manufactured by Denki Kagaku), Denka Σ1000, Σ5000, Σ6000, Denka CSA (manufactured by Denki Kagaku), and Onoda Σ1000 (manufactured by Taiheiyo Cement).
[0008]
In the present invention, the vinyl monomer (a) having 2 to 3 carbon atoms includes ethylene oxide (hereinafter referred to as EO) and propylene oxide (hereinafter referred to as PO). Is preferred. These AO addition forms may be EO or PO addition alone, random addition, block addition, or alternate addition. In the monomer (a), the viscosity state of the concrete is good when the added mole number of AO introduced is in the range of 2 to 100 on average, and 5-80, especially 9-50, is excellent.
[0009]
The monomer (b) is a vinyl monomer containing at least one of a carboxyl group, a sulfonic acid group, an amide group or a water-soluble salt thereof. Examples of the water-soluble salt include sodium salts, potassium salts, calcium salts, magnesium salts, ammonium salts, triethanolamine salts, diethanolamine salts, monoethanolamine salts, and the like.
[0010]
In the present invention, the monomer (a) is preferably a compound represented by the following general formula (A), and the monomer (b) is preferably a compound represented by the general formula (B) or (C). .
[0011]
[Chemical 3]
(Where
R 1 , R 2 ; hydrogen atom or methyl group
m 1 ; integer from 0 to 2
AO: C2-C3 oxyalkylene group
n: Number from 2 to 100
X represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. )
[0013]
[Formula 4]
(Where
R 3 , R 6 ; hydrogen atom or methyl group
R 4 , R 5 ; a hydrogen atom, a methyl group or (CH 2 ) m 2 COOM 2 , (CH 2 ) m 2 COOM 2 forms an anhydride with COOM 1 or other (CH 2 ) m 2 COOM 2 In that case, M 1 and M 2 of those groups do not exist.
M 1 , M 2 , Y: hydrogen atom, alkali metal atom, alkaline earth metal atom, ammonium, and alkyl (carbon number 2 to 8) ammonium optionally substituted with a hydroxyl group
m 2 represents an integer of 0 to 2 ; ).
[0015]
As the monomer represented by the general formula (A), an esterified product of a polyalkylene glycol with one-end alkyl group blocked such as methoxypolyethylene glycol, methoxypolyethylenepolypropylene glycol, ethoxypolyethyleneglycol or propoxypolyethyleneglycol and acrylic acid or methacrylic acid Or EO and PO adducts to acrylic acid or methacrylic acid. n is the average number of moles of AO group added, and the above range is preferable.
[0016]
In addition, a combination of a monomer of general formula (A) with n of 50 to 100 and a monomer of general formula (A) with n of 2 to 50, or a monomer with n of more than 100 and n of 2 Combination of ˜50 monomers is also possible as long as the effects of the present invention are not impaired.
[0017]
Examples of the monomer represented by the general formula (B) include acrylic acid, methacrylic acid, crotonic acid, maleic anhydride, maleic acid, itaconic anhydride, itaconic acid, citraconic anhydride, citraconic acid, fumaric acid, or these Alkali metal salt, alkaline earth metal salt, ammonium salt, and alkyl (carbon number 2 to 8) ammonium salt which may be substituted with a hydroxyl group.
[0018]
Examples of the monomer represented by the general formula (C) include allyl sulfonic acid, methallyl sulfonic acid, or an alkali metal salt, an alkaline earth metal salt, an ammonium salt, and an alkyl group optionally substituted with a hydroxyl group ( C2-C8) ammonium salt is mentioned.
[0019]
The water-soluble copolymer of the present invention is preferably one using monomers represented by the above general formulas (A) to (C). The copolymer can be produced by a known method. Examples include solution polymerization methods disclosed in JP-A-7-223852, JP-A-7-247150, and JP-A-11-157897. In water and lower alcohols having 1 to 4 carbon atoms, ammonium persulfate, peroxide In the presence of a polymerization initiator such as hydrogen, if necessary, sodium sulfite, mercaptoethanol or the like may be added and reacted at 50 to 100 ° C. for 0.5 to 10 hours.
[0020]
In addition to the monomers (A) to (C), a copolymerizable monomer may be copolymerized within a range not impairing the effects of the present invention. Examples of such monomers include acrylonitrile, acrylamide, methacrylamide, styrene and the like.
[0021]
Examples of the water-soluble copolymer used in the present invention include copolymers of alkenyl ethers and maleic anhydride, in addition to those using the monomers (A) to (C).
[0022]
The ratio of the monomer (a) to the monomer (b) in the monomer mixture for obtaining the water-soluble copolymer is: monomer (a) / monomer (b) = 0.1 / 100- 200/100 (molar ratio) is excellent in concrete viscosity, and the monomer (a) / monomer (b) = 10/100 to 100/100 (molar ratio) range is particularly excellent. In the monomer mixture, the total of the monomer (a) and the monomer (b) is preferably 50 to 100 mol%, more preferably 80 to 100 mol%, and particularly preferably 90 to 100 mol%.
[0023]
Further, the water-soluble copolymer of the present invention has excellent dispersibility when the weight average molecular weight (gel permeation chromatography method / standard substance sodium polystyrene sulfonate equivalent / water system) is 5,000 to 500,000, particularly 20,000 to 100,000.
[0024]
The water-soluble copolymer of the present invention is preferably a copolymer of methanol AO adduct and (meth) acrylic acid, particularly methacrylic acid ester (a1) and (meth) acrylic acid, particularly methacrylic acid (b1). . The average added mole number of AO in methanol is preferably in the same range as n. The monomer ratio is preferably (a1) / (b1) = 5/100 to 100/100 (molar ratio), more preferably 10/100 to 50/100. Also, a mixture containing 20% by weight or more, preferably 40% by weight of the total water-soluble copolymer can be used.
[0025]
The concrete composition of the present invention preferably contains a water-soluble copolymer in an amount of 0.01 to 3.0% by weight, particularly 0.1 to 1.0% by weight, based on the cement weight.
[0026]
The concrete composition of the present invention contains cements such as early-strength cement and blast furnace cement as a main component, and contains a high-strength material and a water-soluble copolymer as an admixture, but uses a known additive (material) in combination. You can also For example, antifoaming agents, thickeners, waterproofing agents, retardation agents, early strengthening agents, accelerators, water reducing agents, high performance water reducing agents, foaming agents, foaming agents, AE agents, surfactants, etc. Can be mentioned.
[0027]
【Example】
(1) Water-soluble copolymer Table 1 shows the water-soluble copolymer used in Examples and Comparative Examples. Among them, Nos. 1 to 11 are produced according to the descriptions in JP-A-59-162163, JP-A-2-163108, JP-A-7-223852, JP-A-11-157897, etc. It is a thing. EO represents ethylene oxide, PO represents propylene oxide, and the number after () is the average number of moles added. Water-soluble copolymer No. 9 is a block adduct. The molecular weight of the water-soluble copolymer is a weight average molecular weight determined by a gel permeation chromatography method (standard substance sodium polystyrene sulfonate conversion / water system).
[0028]
[Table 1]
(2) Concrete blends Tables 2 to 4 show the blends of concrete used in Examples and Comparative Examples.
[0030]
[Table 2]
[Table 3]
[Table 4]
(3) Evaluation <Concrete tightening evaluation>
To the concrete blends shown in Tables 2 to 4, the water-soluble copolymers shown in Table 1 are added in the amounts shown in Tables 5 to 7 to adjust the slump value to 5 to 6 cm, and the inner diameter is 20 cm × height is 30 cm. 15 kg of concrete was put into the mold for centrifugal molding and centrifugal compaction was performed. Here, the slump value was measured by the method of JIS-A1101. The concrete strength was measured with the compaction time and the degree of concrete compaction was observed with the naked eye.
[0034]
Centrifugation is performed at 5G (49m / s 2 ) for 1 minute, 15G (147m / s 2 ) for 2 minutes, then 30G (294m / s 2 ) for 2 minutes, 4 minutes, and 5 minutes. Were observed according to the following criteria.
[0035]
A: Good inner surface smoothness and average compaction ○: Average compaction Δ: Somewhat poor inner surface or outer surface smoothness X: Gravel exposed, poor inner surface or outer surface smoothness .
[0036]
<Evaluation of compressive strength>
In the concrete tightening evaluation, the compaction after the concrete was charged was performed at 30 G (294 m / s 2 ) for 3 minutes, and the compressive strength of the cured body was measured according to the JIS-A1108 method after steam curing or after autoclave curing. The steam curing conditions were 2 hours in advance, 1 hour at 20 ° C., 5 hours at 65 ° C., and 24 hours. The autoclave curing conditions were such that the cured body after 24 hours of steam curing was 6 hours at 180 ° C. (10 atm) and slowly cooled for 24 hours. The measurement results are shown in Tables 5-7.
[0037]
[0038]
[Table 6]
[Table 7]
【The invention's effect】
The concrete composition of the present invention has good compaction after centrifugal molding and exhibits excellent effects in strength development.
Claims (1)
前記水溶性共重合体が炭素数２〜３のアルキレンオキシドを平均で25〜40モル付加したポリオキシアルキレン鎖を有する化合物からなるビニル系単量体(a)の１種以上と、カルボキシル基、スルホン酸基又はアミド基を有する化合物若しくはそれらの水溶性塩からなるビニル系単量体(b)の１種以上とを含有する単量体混合物を重合して得られる水溶性共重合体であり、
前記単量体(a)が一般式(A)で表される化合物であり、前記単量体(b)が一般式(B)又は(C)で表される化合物であり、
前記高強度材が水和反応によりトバモライト結晶又はエトリンガイト結晶を生成する鉱物であり、該高強度材をセメント重量に対して５〜15重量％含有する、
遠心成形用コンクリート組成物。
R1，R2；水素原子又はメチル基
m1；０〜２の整数
AO；炭素数２〜３のオキシアルキレン基
n；25〜40の数
X；水素原子又は炭素１〜３のアルキル基
を表す。）
R3，R6；水素原子又はメチル基
R4，R5；水素原子、メチル基又は(CH2)m2COOM2であり、(CH2)m2COOM2はCOOM1又は他の(CH2)m2COOM2と無水物を形成していてもよく、その場合、それらの基のM1，M2は存在しない。
M1，M2，Y；水素原子、アルカリ金属原子、アルカリ土類金属原子、アンモニウム、水酸基が置換していてもよいアルキル（炭素数２〜８）アンモニウム
m2；０〜２の整数
を表す。）A concrete composition for centrifugal molding comprising a cement, a high-strength material, and a water-soluble copolymer as an admixture,
One or more vinyl monomers (a) composed of a compound having a polyoxyalkylene chain in which the water-soluble copolymer is added with an average of 25 to 40 moles of an alkylene oxide having 2 to 3 carbon atoms, a carboxyl group, A water-soluble copolymer obtained by polymerizing a monomer mixture containing a compound having a sulfonic acid group or an amide group or one or more vinyl monomers (b) composed of water-soluble salts thereof. ,
The monomer (a) is a compound represented by the general formula (A), the monomer (b) is a compound represented by the general formula (B) or (C),
The high-strength material is a mineral that produces tobermorite crystals or ettringite crystals by a hydration reaction, and contains the high-strength material in an amount of 5 to 15 % by weight based on the cement weight.
A concrete composition for centrifugal molding.
R 1 , R 2 ; hydrogen atom or methyl group
m 1 ; integer from 0 to 2
AO: C2-C3 oxyalkylene group
n; Number from 25 to 40
X represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. )
R 3 , R 6 ; hydrogen atom or methyl group
R 4 , R 5 ; a hydrogen atom, a methyl group or (CH 2 ) m 2 COOM 2 , (CH 2 ) m 2 COOM 2 forms an anhydride with COOM 1 or other (CH 2 ) m 2 COOM 2 In that case, M 1 and M 2 of those groups do not exist.
M 1 , M 2 , Y: hydrogen atom, alkali metal atom, alkaline earth metal atom, ammonium, and alkyl (carbon number 2 to 8) ammonium optionally substituted with a hydroxyl group
m 2 represents an integer of 0 to 2 ; )
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| JP4056809B2 (en) * | 2002-07-09 | 2008-03-05 | 花王株式会社 | Powder shrinkage reducing agent |
| JP4896443B2 (en) * | 2004-06-24 | 2012-03-14 | 花王株式会社 | Method for producing centrifugal molded cured body |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5874552A (en) * | 1981-10-30 | 1983-05-06 | 株式会社日本触媒 | Cement dispersant |
| JPH0328151A (en) * | 1989-06-27 | 1991-02-06 | Denki Kagaku Kogyo Kk | Cement composition and mortar or concrete produced by using the same |
| JPH06100346A (en) * | 1992-09-18 | 1994-04-12 | Kao Corp | Admixture for concrete |
| JPH0812399A (en) * | 1994-07-06 | 1996-01-16 | Kao Corp | Admixture composition for concrete product |
| JPH092853A (en) * | 1995-06-19 | 1997-01-07 | Denki Kagaku Kogyo Kk | Slag-reducing agent and production of centrifugally formed article using the material |
| JPH0940450A (en) * | 1995-07-27 | 1997-02-10 | Denki Kagaku Kogyo Kk | Method for mixing concrete for centrifugal casting |
-
2000
- 2000-03-08 JP JP2000063570A patent/JP4554023B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5874552A (en) * | 1981-10-30 | 1983-05-06 | 株式会社日本触媒 | Cement dispersant |
| JPH0328151A (en) * | 1989-06-27 | 1991-02-06 | Denki Kagaku Kogyo Kk | Cement composition and mortar or concrete produced by using the same |
| JPH06100346A (en) * | 1992-09-18 | 1994-04-12 | Kao Corp | Admixture for concrete |
| JPH0812399A (en) * | 1994-07-06 | 1996-01-16 | Kao Corp | Admixture composition for concrete product |
| JPH092853A (en) * | 1995-06-19 | 1997-01-07 | Denki Kagaku Kogyo Kk | Slag-reducing agent and production of centrifugally formed article using the material |
| JPH0940450A (en) * | 1995-07-27 | 1997-02-10 | Denki Kagaku Kogyo Kk | Method for mixing concrete for centrifugal casting |
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