JPH11189451A - High-strength cement-based composition - Google Patents
High-strength cement-based compositionInfo
- Publication number
- JPH11189451A JPH11189451A JP9360580A JP36058097A JPH11189451A JP H11189451 A JPH11189451 A JP H11189451A JP 9360580 A JP9360580 A JP 9360580A JP 36058097 A JP36058097 A JP 36058097A JP H11189451 A JPH11189451 A JP H11189451A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- dispersant
- aggregate
- weight
- less
- 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.)
- Granted
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
- 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
- C04B24/2641—Polyacrylates; Polymethacrylates
- C04B24/2647—Polyacrylates; Polymethacrylates containing polyether side chains
-
- 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
- C04B24/2664—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers
- C04B24/267—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers containing polyether side chains
-
- 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
- C04B2103/40—Surface-active agents, dispersants
- C04B2103/408—Dispersants
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、流動性に優れた高
強度のセメント系組成物に関し、より詳しくは、流動性
が高いので成形が容易であり、かつ硬化体の強度が大き
いセメント系組成物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength cement-based composition having excellent fluidity, and more particularly, to a cement-based composition having high fluidity, which is easy to mold and has high strength of a cured product. It is about things.
【０００２】[0002]
【従来の技術】セメント系組成物の代表としてコンクリ
ートがある。コンクリートには経済性を高めると共にそ
の乾燥による収縮を抑えてひび割れを防止するために容
積比で７割程度の骨材が含まれている。この骨材には平
均粒径５mm以上の粗骨材と、これより平均粒径が小さい
細骨材とが用いられている。粗骨材を用いる目的は材料
の充填率を高めることにより成形に必要な流動性を少な
い水量で得られるようにすることにある。水量を低減す
れば相対的に水セメント比が小さくなり、セメントペー
スト部分を高強度化する上で有利になる。2. Description of the Related Art Concrete is a typical cement-based composition. Concrete contains about 70% by volume of aggregate to increase economic efficiency and to suppress shrinkage due to drying to prevent cracking. As this aggregate, a coarse aggregate having an average particle size of 5 mm or more and a fine aggregate having an average particle size smaller than this are used. The purpose of using coarse aggregate is to increase the filling rate of the material so that the fluidity required for molding can be obtained with a small amount of water. If the amount of water is reduced, the water-cement ratio becomes relatively small, which is advantageous in increasing the strength of the cement paste portion.
【０００３】一方、粒径の大きな粗骨材を用いること
は、粗骨材とマトリックスとで硬化体の均質性が異なる
ので、粗骨材と他のマトリクスとが馴染まず、その界面
が破壊しやすいものとなる。このため、粗骨材の使用は
硬化体の強度を高めるうえでは欠点にもなる。例えば、
圧縮強度が１５０N/mm2以上の高強度の硬化体を得よう
とする場合、また曲げ強度を高めようとする場合など
は、粗骨材を用いることは好ましいとは言えない。他
方、硬化体の組織を均質化するために骨材の粒径を小さ
くすると成形に必要な流動性を得るための水量が増加
し、やはり高強度化のためには好ましくない。そこで、
流動性と低水量を両立させるために分散剤が用いられる
が、従来のものはその効果が不十分である。On the other hand, when coarse aggregate having a large particle size is used, the homogeneity of the hardened material differs between the coarse aggregate and the matrix, so that the coarse aggregate does not become compatible with the other matrix and the interface is broken. It will be easy. For this reason, the use of coarse aggregate is a disadvantage in increasing the strength of the cured product. For example,
It is not preferable to use coarse aggregates when obtaining a high-strength cured body having a compressive strength of 150 N / mm 2 or more, or when increasing the bending strength. On the other hand, if the particle size of the aggregate is reduced in order to homogenize the structure of the hardened body, the amount of water for obtaining the fluidity required for molding increases, which is also unfavorable for increasing the strength. Therefore,
A dispersant is used to achieve both fluidity and low water content, but the effect of the conventional dispersant is insufficient.
【０００４】[0004]
【発明の解決課題】以上のように、従来のセメント系組
成物は成形に必要な流動性と硬化後の強度が不十分であ
る。本発明は、このような従来の問題を解決したセメン
卜系組成物を提供することを目的とする。As described above, the conventional cement-based composition is insufficient in the fluidity required for molding and the strength after hardening. An object of the present invention is to provide a cement composition which solves such conventional problems.
【０００５】[0005]
【課題を解決する手段】すなわち、本発明は、(１)セメ
ントと骨材に分散剤と水を加えたものを主体とする組成
物であって、骨材が粒径５mm以下の粉粒体であり、添加
水量が体積比で２５％以下、分散剤が一般式−(ΑＯ)ｎ
−Ｒ（ＡＯは炭素数２から１２のオキシアルキレン基、
Ｒは水素あるいは炭素数２から１２の炭化水素基、(Ａ
Ｏ)ｎはｎがオキシアルキレン基の平均付加モル数３０
以上のポリオキシアルキレン基）で表される分子構造を
有するものであることを特徴とするセメント系組成物に
関する。That is, the present invention provides (1) a composition mainly composed of a cement and an aggregate to which a dispersant and water are added, wherein the aggregate has a particle size of 5 mm or less. Wherein the amount of water added is 25% or less by volume and the dispersant is represented by the general formula-(ΑO) n
-R (AO is an oxyalkylene group having 2 to 12 carbon atoms,
R represents hydrogen or a hydrocarbon group having 2 to 12 carbon atoms;
O) n is the case where n is an average number of moles of added oxyalkylene group of 30
The present invention relates to a cement composition having a molecular structure represented by the above polyoxyalkylene group).
【０００６】本発明の上記セメント系組成物は、（２）
ポリオキシアルキレン基と共にカルボキシル基および/
またはスルホン基を有する分散剤を用いたもの、（３）
ポリオキシアルキレン基が分子中５０重量％以上である
分散剤を用いたもの、（４）骨材(P)とセメント(C)の重
量比(P/C)が０.５〜４であるもの、（５）骨材が、セメ
ント１００重量部に対して、粒径１μm未満の粒子４０
重量部以下、粒径１μm〜７５μmの粒子２００重量部以
下、粒径７５μm〜５mmの粒子４００重量部以下である
もの、（６）分散剤の添加量が、粒径７５μm以下の骨
材およびセメントに対して０.１〜５重量％であるも
の、（７）分散剤の他に、可溶性カルシウム塩が添加さ
れたものを含む。The cement composition of the present invention comprises (2)
Carboxyl group and / or polyoxyalkylene group
Or using a dispersant having a sulfone group, (3)
A dispersant having a polyoxyalkylene group content of at least 50% by weight in the molecule; (4) a weight ratio (P / C) of the aggregate (P) to the cement (C) of 0.5 to 4 (5) The aggregate is composed of particles 40 having a particle size of less than 1 μm with respect to 100 parts by weight of cement.
Not more than 200 parts by weight of particles having a particle size of 1 μm to 75 μm and not more than 400 parts by weight of particles having a particle size of 75 μm to 5 mm. (6) Aggregate and cement having a dispersant addition amount of 75 μm or less. 0.1 to 5% by weight with respect to (7) a dispersant and a solution to which a soluble calcium salt is added.
【０００７】[0007]
【発明の実施態様】以下に本発明を実施例と共に詳細に
説明する。本発明のセメント系組成物は、セメントと骨
材の配合に分散剤と水を加えてなる組成物であって、骨
材の粒径を細骨材以下の範囲に限定して出来るだけ組成
物を均質化し、さらに特定の分子構造を有する分散剤を
添加することにより添加水量を低減しながら優れた流動
性と材料強度を達成したものである。具体的には、骨材
を粒径５mm以下の粉粒体とし、添加水量を体積比で２５
％以下に限定すると共に、分散剤として一般式−(ＡＯ)
ｎ−Ｒ（ＡＯは炭素数２から１２のオキシアルキレン
基、Ｒは水素あるいは炭素数２から１２の炭化水素基、
(ΑＯ)ｎはｎがオキシアルキレン基の平均付加モル数３
０以上のポリオキシアルキレン基）で表される分子構造
を有するものを用いたものである。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples. The cement-based composition of the present invention is a composition obtained by adding a dispersant and water to a mixture of cement and an aggregate, and the composition is limited as far as possible by limiting the particle size of the aggregate to the range of fine aggregate or less. In this case, excellent fluidity and material strength are achieved while reducing the amount of water added by homogenizing and further adding a dispersant having a specific molecular structure. Specifically, the aggregate is formed into a powder having a particle size of 5 mm or less, and the amount of added water is 25% by volume.
% And a dispersant represented by the general formula-(AO)
n-R (AO is an oxyalkylene group having 2 to 12 carbon atoms, R is hydrogen or a hydrocarbon group having 2 to 12 carbon atoms,
(ΑO) n is such that n is an average number of moles of added oxyalkylene group of 3
(0 or more polyoxyalkylene groups).
【０００８】(Ｉ)セメント 本発明に用いられるセメントの種類は限定されない。ポ
ルトランドセメント、混合セメント、速硬セメントなど
を用いることができる。ポルトランドセメントは普通、
中庸熱、早強、超早強、耐硫酸塩、低熱、白色の各ポル
トランドセメントを用いることができる。中庸熱、耐硫
酸塩、低熱の各ポルトランドセメントはアルミネート鉱
物(Ｃ3Α)の含有量が少なく、流動性が良いので好まし
い。混合セメントにはフライアッシュセメント、高炉セ
メント、シリカセメントがあるが何れも本発明に用いる
ことができる。混合セメントは組成物中のポルトランド
セメント分が他のセメントよりも相対的に少ないので流
動性を高める点では好ましい。速硬セメントは短時間で
硬化するので流動性が早く失われるが、早期に強度の発
現を求められる場合には効果的である。 (I) Cement The type of cement used in the present invention is not limited. Portland cement, mixed cement, quick-setting cement, or the like can be used. Portland cement is usually
Moderate heat, fast strength, ultra fast strength, sulfate resistant, low heat, white Portland cement can be used. Moderate heat, sulfate resistant and low heat Portland cements are preferred because of their low aluminate mineral (C 3 3 ) content and good fluidity. The mixed cement includes fly ash cement, blast furnace cement and silica cement, all of which can be used in the present invention. The mixed cement is preferable in that the Portland cement content in the composition is relatively small as compared with other cements, so that the fluidity is enhanced. Fast-setting cement hardens in a short time and thus loses its fluidity quickly. However, it is effective when it is required to develop strength early.
【０００９】(II)骨材 本発明において用いる骨材は粒径５mm以下のものであ
る。なお、本発明において粒径５mm以下とは、日本工業
規格(JIS A 1102−1989)に規定される骨材の篩分け試験
において、５mm篩上の残量が１０％未満であることを云
う。好ましくは、１.２mm篩上の残量が１０％未満のも
のが適当である。 (II) Aggregate The aggregate used in the present invention has a particle size of 5 mm or less. In the present invention, a particle size of 5 mm or less means that the residual amount on a 5 mm sieve is less than 10% in an aggregate sieving test prescribed in Japanese Industrial Standards (JIS A 1102-1989). Preferably, the one having a residual amount of less than 10% on a 1.2 mm sieve is suitable.
【００１０】本発明の骨材は、流動性を高めると共に組
成物の充填度および強度を高めるために、以下の粒度分
布を有するものが好ましい。即ち、セメント１００重量
部に対して、１μm以下の粒子が４０重量部以下、ｌμm
〜７５μmの粒子が２００重量部以下、７５μm以上の粒
子が４００重量部以下であって、粉体(Ρ)とセメント
(Ｃ)の重量比(Ρ/Ｃ)が０.５〜４であるものが好まし
い。The aggregate of the present invention preferably has the following particle size distribution in order to increase the flowability and the degree of filling and strength of the composition. That is, particles of 1 μm or less are not more than 40 parts by weight, and 1 μm
Particles of up to 75 μm are 200 parts by weight or less, particles of 75 μm or more are 400 parts by weight or less, and powder (Ρ) and cement
It is preferable that the weight ratio (Ｃ / C) of (C) is 0.5 to 4.
【００１１】骨材の材質は限定されない。なお、シリカ
質の骨材でセメントとポゾラン反応するものは高強度を
得るうえで好ましい。特に粒径の小さいものはポゾラン
反応の点でシリカ質含有量の高いものがより好ましい。
シリカ質骨材の例としては、シリカフューム、シリカゾ
ル、沈降シリカ、フライアッシュ、スラグ、火山灰、珪
砂、岩石粉末、河川砂、山砂、陸砂、海砂、砕砂があ
る。なお、シリカと石灰のバランスを調整するために石
灰石微粉末、石灰石砕砂を用いることも有益である。The material of the aggregate is not limited. Note that a silica-based aggregate that undergoes a pozzolanic reaction with cement is preferable for obtaining high strength. Particularly, those having a small particle size are more preferably those having a high siliceous content in terms of the pozzolan reaction.
Examples of siliceous aggregates include silica fume, silica sol, precipitated silica, fly ash, slag, volcanic ash, silica sand, rock powder, river sand, mountain sand, land sand, sea sand, and crushed sand. It is also useful to use limestone fine powder and limestone crushed sand to adjust the balance between silica and lime.
【００１２】(III)分散剤 本発明に用いる分散剤は、その分子中に、一般式−(Ａ
Ｏ)ｎ−Ｒ（ＡＯは炭素数２から１２のオキシアルキレ
ン基、Ｒは水素あるいは炭素数２から１２の炭化水素
基、(ＡＯ)ｎはｎがオキシアルキレン基の平均付加モル
数で３０以上のポリオキシアルキレン基）で表される分
子構造を有するものである。分散剤の分子中に含まれる
ポリオキシアルキレン基は、その立体障害効果により組
成物の材料粒子どうしを反発させて分散性を高める。特
にナフタレンスルホン酸では分散が難しかった低水粉体
比の系において有効にその効果を発揮する。 (III) Dispersant The dispersant used in the present invention has a compound represented by the general formula-(A)
O) n-R (AO is an oxyalkylene group having 2 to 12 carbon atoms, R is hydrogen or a hydrocarbon group having 2 to 12 carbon atoms, and (AO) n is that n is an average addition mole number of the oxyalkylene group of 30 or more. A polyoxyalkylene group). The polyoxyalkylene group contained in the molecule of the dispersant repels the material particles of the composition due to the steric hindrance effect and enhances the dispersibility. In particular, the effect is effectively exerted in a system having a low water powder ratio, which is difficult to disperse with naphthalenesulfonic acid.
【００１３】このような立体障害効果によって材料粒子
どうしを反発させるには、オキシアルキレン基の平均付
加モル数(一般式のｎ)が重要である。平均付加モル数ｎ
が大きいほどその効果が大きい。具体的にはｎ＝３０以
上が適当である。好ましくは５０以上が良い。平均付加
モル数ｎの上限は特に限定されないが、製造の経済性か
らは２００以下が妥当であろう。なお、分散剤は分子中
に異なる平均付加モル数ｎのオキシアルキレン基を２種
以上含有するものでも良い。ポリオキシアルキレン基の
うち製造上経済的であるのはポリオキシエチレン基であ
るが、その他にポリオキシプロピレン基等でも良い。ま
た、２種以上のオキシアルキレン基を同一鎖上に持つも
のでも良い。In order to repel material particles due to such a steric hindrance effect, the average number of moles of oxyalkylene group added (n in the general formula) is important. Average number of moles added n
The greater the value, the greater the effect. Specifically, n = 30 or more is appropriate. Preferably, it is 50 or more. The upper limit of the average number of added moles n is not particularly limited, but from the economical point of production, 200 or less may be appropriate. The dispersant may contain two or more oxyalkylene groups having different average addition moles n in the molecule. Among the polyoxyalkylene groups, the one that is economical in production is the polyoxyethylene group, but may be a polyoxypropylene group or the like. Further, those having two or more oxyalkylene groups on the same chain may be used.
【００１４】さらに、本発明に用いる分散剤は、セメン
トに吸着して効果を高めるように、カルボキシル基およ
び／またはスルホン基をポリオキシエチレンと共に有す
るものが好ましい。具体的な例として、(i)アクリレー
ト、メタクリレートまたはその誘導体などのアクリル酸
系の単量体と、これら単量体と共重合可能なポリオキシ
アルキレン基を持つ化合物を必須成分とする共重合体、
(ii)無水マレイン酸と、無水マレイン酸と共重合可能な
ポリオキシアルキレンを持つ化合物との共重合物、(ii
i)上記(i)(ii)にアリルスルホン酸等のスルホン酸化合
物を成分として重合した共重合物、(iV)芳香族化合物と
ホルムアルデヒド共縮合可能なポリオキシアルキレン基
を持つ化合物とホルムアルデヒド共縮合物が例示され
る。なお、これらの共重合体や共縮合物は塩の形でも良
い。Further, the dispersant used in the present invention preferably has a carboxyl group and / or a sulfone group together with polyoxyethylene so as to be adsorbed on cement to enhance the effect. As a specific example, (i) an acrylic acid-based monomer such as acrylate, methacrylate or a derivative thereof, and a copolymer having a compound having a polyoxyalkylene group copolymerizable with these monomers as an essential component ,
(ii) a copolymer of maleic anhydride and a compound having a polyoxyalkylene copolymerizable with maleic anhydride, (ii)
i) a copolymer obtained by polymerizing a sulfonic acid compound such as allyl sulfonic acid as a component in (i) and (ii) above, and (iV) a compound having a polyoxyalkylene group capable of co-condensing an aromatic compound with formaldehyde and formaldehyde co-condensation. Things are illustrated. In addition, these copolymers and co-condensates may be in the form of a salt.
【００１５】これらのポリオキシアルキレン基を持つ化
合物(以下、ポリオキシアルキレン化合物と云う)を必須
成分とするセメント分散剤は、例えば、アクリル酸系の
共重合物は特開昭58-74552号、特開平01-226757号、特
開平6-206750号、特開平07-109156号、特開平07-126053
号、特開平08-12396号、特開平09-27850号などに記載さ
れており、また無水マレイン酸の共重合物は特開昭63-2
85140号、特開平05-310458号、特開平09-255740号など
に記載されている。また、芳香族化合物とのホルムアル
デヒド共縮合物の例は特開平06-340459号、特開平07-10
9158号に記載されている。しかし、これらは何れもその
成分を示したものに過ぎず、セメント系組成物の強度を
高める目的でその付加モル数ｎを検討したものは知られ
ていない。しかも、これらに記載されている組成物の強
度は本発明よりも格段に低い。例えば、高強度セメント
組成物の提供を目的とした特開平6-206750号においてさ
え、実施例に示された最高の強度は１３５N/mm2に止ま
っており、本発明のような１５０N/mm2水準の高強度セ
メント組成物を提供するものではない。Cement dispersants containing a compound having a polyoxyalkylene group (hereinafter referred to as a polyoxyalkylene compound) as an essential component include, for example, acrylic copolymers disclosed in JP-A-58-74552. JP-A-01-226757, JP-A-6-206750, JP-A-07-109156, JP-A-07-126053
JP-A-08-12396, JP-A-09-27850, and the copolymer of maleic anhydride is described in JP-A-63-2
No. 85140, JP-A-05-310458, JP-A-09-255740 and the like. Examples of formaldehyde cocondensates with aromatic compounds are described in JP-A-06-340459 and JP-A-07-10
No. 9158. However, each of these is merely an indication of its component, and there is no known one that examines the number of moles added n for the purpose of increasing the strength of the cement composition. Moreover, the strength of the compositions described therein is significantly lower than in the present invention. For example, even in JP-A-6-206750 for the purpose of providing high-strength cement composition, the best strength shown in the examples are mere 135N / mm 2, 150N / mm 2 , such as in the present invention It does not provide a level of high strength cement composition.
【００１６】本発明に用いる分散剤において、ポリオキ
シアルキレン基の分子中の含有量は、５０重量％以上が
適当である。５０重量％未満ではポリオキシアルキレン
基による立体障害効果による粒子分散効果が十分得られ
ず、セメント系組成物の流動性が不十分になる。In the dispersant used in the present invention, the content of the polyoxyalkylene group in the molecule is suitably at least 50% by weight. If the amount is less than 50% by weight, the particle dispersion effect due to the steric hindrance effect of the polyoxyalkylene group cannot be sufficiently obtained, and the fluidity of the cement composition becomes insufficient.
【００１７】分散剤の添加量は、粒径７５μm以下の骨
材に対して重量比で、０.１〜５％が適当である。粒径
７５μm以下の骨材は組成物の流動性を低下させるの
で、分散剤によって流動性の低下を防止する。分散剤の
添加量が上記範囲より少ないとセメント系組成物の流動
性が大幅に低く、また、この添加量が上記範囲より多過
ぎるとセメント系組成物の強度発現を阻害するので好ま
くない。The addition amount of the dispersant is suitably 0.1 to 5% by weight based on the aggregate having a particle size of 75 μm or less. Aggregate having a particle size of 75 μm or less lowers the flowability of the composition, and thus the dispersant prevents the flowability from lowering. If the amount of the dispersant is less than the above range, the fluidity of the cement composition is significantly low, and if the amount is too large, the strength of the cement composition is impaired, which is not preferable.
【００１８】本発明のセメント系組成物は、可溶性カル
シウム塩を添加することにより強度の発現を促進するこ
とができる。入手が容易で利用しやすい可溶性カルシウ
ム塩の例として、亜硝酸カルシウム、硝酸カルシウム、
ギ酸カルシウム、チオシアン酸カルシウム、塩化カルシ
ウムなどがある。これらの添加量は０.１〜５重量％が
適当である。The cement composition of the present invention can promote the development of strength by adding a soluble calcium salt. Examples of soluble calcium salts that are readily available and easy to use include calcium nitrite, calcium nitrate,
Examples include calcium formate, calcium thiocyanate, and calcium chloride. The appropriate amount of these additives is 0.1 to 5% by weight.
【００１９】本発明のセメント系組成物に添加される水
量は、全材料の合計体積に対し体積比で２５％以下であ
り、１０％〜２５％が好ましい。特に高強度を得ようと
する場合には２０％以下が好ましい。水量が１０％未満
では組成物の流動性が失われる。また、添加水量が２５
％を上回ると強度が低下する。The amount of water added to the cementitious composition of the present invention is not more than 25% by volume, preferably 10% to 25%, based on the total volume of all materials. In particular, when high strength is to be obtained, the content is preferably 20% or less. If the amount of water is less than 10%, the fluidity of the composition is lost. In addition, the amount of added water is 25
%, The strength decreases.
【００２０】本発明のセメント系組成物を硬化させる場
合、養生については特別の処理を必要としない。なお、
４５℃以上の温度に３時間以上置くと、より高強度の硬
化体を得ることができる。When curing the cementitious composition of the present invention, no special treatment is required for curing. In addition,
If it is kept at a temperature of 45 ° C. or more for 3 hours or more, a cured product with higher strength can be obtained.
【００２１】[0021]
【発明の効果】本発明のセメント系組成物は、硬化後に
１５０N/mm2以上の圧縮強度を得ることができる。この
ように非常に緻密で硬化体の強度が大きく、しかも耐久
性に優れるので、土木、建築、機械等の各分野において
広く利用することができ、従来のコンクリートに代えて
使用することにより更に耐久性を高めることができる。
また、樹脂や鋼材の代替としての使用も可能である。更
に、本発明のセメント系組成物は流動性に優れるので、
施工性が良く、流し込みが可能でポンプを使い容易に施
工することができる。The cement composition of the present invention can obtain a compressive strength of 150 N / mm 2 or more after hardening. As described above, it is very dense, has high strength of the cured body, and has excellent durability, so it can be widely used in various fields such as civil engineering, construction, and machinery. Can be enhanced.
It can also be used as a substitute for resin and steel. Furthermore, since the cement composition of the present invention has excellent fluidity,
The workability is good, pouring is possible, and the work can be easily carried out using a pump.
【００２２】[0022]
【実施例】以下、本発明を実施例によって具体的に示
す。実施例１ 各材料の配合比が、中庸熱ポルトランドセメント３５体
積部に、骨材としてシリカフューム１０体積部、珪石粉
末１５体積部、豊浦珪砂２０体積部を加え、これに表１
に示す分散剤を含む水２０体積部を添加してセメント組
成物とした。このセメント組成物１リットルをホバートミキ
サーで１０分間練り混ぜ、これをガラス板上に置いたリ
ング(D25mm×H20mm)に流し込み、リングを引き上げて丸
く広がった組成物の長径と短径を測定し、その平均値を
フロー値として表し、流動性を評価した。また、この組
成物を用いて角柱の供試体(2×2×H3cm)を成形し、２０
℃の水中養生を２８日、８０℃の水中養生を３日行った
後に圧縮強度を日本工業規格(JIS A 1108)に従って測定
した。この結果を表１に示した。なお、骨材は、セメン
ト１００重量部に対し、１μm以下の粒子２３重量部、
１〜７５μmの粒子３９重量部、７５μm〜５mmの粒子５
０重量部からなるものである。分散剤の添加量はセメン
ト１００重量部に対し１重量部である。なお、表１に示
す分散剤の成分は表２の通りである。EXAMPLES The present invention will be specifically described below with reference to examples. Example 1 The mixing ratio of each material was 35 parts by volume of medium heat Portland cement, 10 parts by volume of silica fume, 15 parts by volume of silica powder, and 20 parts by volume of Toyoura silica sand were added as aggregates.
20 parts by volume of water containing a dispersant shown in (1) was added to obtain a cement composition. One liter of this cement composition was kneaded with a Hobart mixer for 10 minutes, poured into a ring (D25 mm × H20 mm) placed on a glass plate, and the ring was pulled up to measure the major axis and minor axis of the composition that had spread out round, The average value was expressed as a flow value, and the fluidity was evaluated. A prismatic test piece (2 × 2 × H3 cm) was formed using this composition,
After curing in water at 28 ° C. for 28 days and curing in water at 80 ° C. for 3 days, the compressive strength was measured in accordance with Japanese Industrial Standards (JIS A 1108). The results are shown in Table 1. The aggregate is 23 parts by weight of particles of 1 μm or less based on 100 parts by weight of cement,
39 parts by weight of particles of 1 to 75 μm, particles 5 of 75 μm to 5 mm
It consists of 0 parts by weight. The addition amount of the dispersant is 1 part by weight based on 100 parts by weight of cement. The components of the dispersant shown in Table 1 are as shown in Table 2.
【００２３】表１に示すように、分散剤中のオキシエチ
レンの付加モル数の多いものほど組成物の分散性が高く
なり、組成物が均質化されると共に流動性も高められ
る。この作用によって気泡が少なく、かつ均質な成型体
が得られるので成形体の圧縮強度が向上している。ま
た、カルボキシル基とスルホン基を同時に持つものは初
期の流動性が高く、かつ流動性の経時変化を小さくする
ことを可能としている。一方、オキシエチレンの付加モ
ル数が本発明より少ない分散剤を用いた比較例は流動性
が著しく劣っており、圧縮強度が格段に低い。ポリオキ
シアルキレン基を有しない分散剤を用いたものは混練り
ができず、成形不能であった。As shown in Table 1, the greater the number of moles of oxyethylene added to the dispersant, the higher the dispersibility of the composition, the more homogeneous the composition and the higher the fluidity. By this action, a uniform molded body with few air bubbles is obtained, so that the compressive strength of the molded body is improved. In addition, those having both a carboxyl group and a sulfone group have high initial fluidity and can reduce the temporal change of fluidity. On the other hand, the comparative example using the dispersant in which the number of moles of oxyethylene added is smaller than that of the present invention is remarkably inferior in fluidity, and has remarkably low compressive strength. Those using a dispersant having no polyoxyalkylene group could not be kneaded and could not be molded.
【００２４】[0024]
【表１】 [Table 1]
【００２５】[0025]
【表２】 [Table 2]
【００２６】実施例２ 表３に示す配合の材料を用い、バドルミキサーで練混ぜ
た組成物を円柱供試体(D10×H20cm)あるいは角柱供試体
(10×10×40cm)に成形し、２０℃での水中養生２８日後
の圧縮強度および曲げ強度を日本工業規格(JIS A 1108,
1106)に準じて測定した。この結果を表３に示した。な
お、組成物を混練りする際には、先ず粒径５mm以下の材
料に分散剤を含有する水を加えてミキサーで混合し、粒
径５mm以上の材料(粗骨材)を有するものは、この混練物
に粗骨材を加えて練り混ぜた。また、分散剤としてはオ
キシエチレンの付加モル数６８のポリオキシアルキレン
化合物と無水マレイン酸とアリルスルホン酸の共重合物
を用い、その添加量を表３に示した。セメントは低熱ポ
ルトランドセメントを用い、５mm以下の骨材としてシリ
カフューム、珪石粉末、珪砂粉石を用い、粗骨材として
硬質砂岩砕石(吸水率0.3％、最大寸法20mm、ＦＭ=6.7)
を用いた。 Example 2 A column sample (D10 × H20 cm) or a prism sample was prepared by kneading a composition kneaded with a paddle mixer using the ingredients shown in Table 3.
(10 × 10 × 40cm), and the compressive strength and flexural strength after 28 days of curing in water at 20 ° C. were measured according to Japanese Industrial Standards (JIS A 1108,
1106). The results are shown in Table 3. When kneading the composition, first add water containing a dispersant to a material having a particle size of 5 mm or less, mix with a mixer, and a material having a material having a particle size of 5 mm or more (coarse aggregate) The coarse aggregate was added to the kneaded material and kneaded. The dispersant used was a polyoxyalkylene compound having an added mole number of oxyethylene of 68, and a copolymer of maleic anhydride and allylsulfonic acid. The cement used is low-heat Portland cement. Silica fume, silica powder, and silica sand powder are used as aggregates of 5 mm or less. Hard sandstone crushed stone is used as coarse aggregate (water absorption 0.3%, maximum size 20 mm, FM = 6.7).
Was used.
【００２７】[0027]
【表３】 [Table 3]
【００２８】表３の比較例に示すように、粒径５mm以上
の粗骨材を入れたものは極端に圧縮強度ならびに曲げ強
度が減少した。また、単位水量が体積比で２５％を上回
っても強度は大きく低下した。セメントに対する骨材の
重量比が４を越えると組成物が流動性を失い成形できな
かった。一方、本発明の実施例(No.2-1〜No.2-5)はいず
れも高い圧縮強度および曲げ強度を有している。As shown in the comparative examples in Table 3, the samples containing coarse aggregate having a particle size of 5 mm or more had extremely reduced compressive strength and bending strength. Even when the unit water volume exceeded 25% by volume, the strength was greatly reduced. When the weight ratio of aggregate to cement exceeded 4, the composition lost its fluidity and could not be molded. On the other hand, Examples (No. 2-1 to No. 2-5) of the present invention all have high compressive strength and bending strength.
【００２９】実施例３ 各材料の配合比が、セメント(Ｃ)３５体積部に、骨材と
してシリカフューム１０体積部、珪石粉末１５体積部、
豊浦珪砂２０体積部を加え、これに表１に示す分散剤を
含む水２０体積部を添加してセメント組成物とした。こ
のセメント組成物１リットルをホバートミキサで１０分間練
り混ぜ、その流動性をガラス板上に置いたリング(D25mm
？20mm)に流し込み、リングを引き上げ、丸く広がった
組成物の長径と短径を測定し平均値をフロー値として表
し、流動性を評価した。また、この組成物を用い角柱の
供試体(2・？3cm)を成形し、翌日脱型した直後、２０℃
の水中養生を２８日、８０℃の水中養生を３日行った後
に圧縮強度を測定した。この結果を表４に示した。な
お、セメントの種類を中庸(Ｍ)、白色(Ｗ)、普通(Ｎ)と
変えて同様の試験を行った。また、分散剤としてはオキ
シエチレンの付加モル数６８のポリオキシアルキレン化
合物と無水マレイン酸とアリルスルホン酸の共重合物を
用い、その添加量は、セメント１００重量部に対し１重
量部とした。さらに、可溶性カルシウム塩として亜硝酸
カルシウムまたはチオシアン酸カルシウムを表４に示す
量加えた。 EXAMPLE 3 The mixing ratio of each material was 35 parts by volume of cement (C), 10 parts by volume of silica fume as an aggregate, 15 parts by volume of silica powder,
20 parts by volume of Toyoura silica sand were added, and 20 parts by volume of water containing a dispersant shown in Table 1 were added thereto to obtain a cement composition. One liter of this cement composition was kneaded with a Hobart mixer for 10 minutes, and its fluidity was measured by using a ring (D25mm) placed on a glass plate.
? 20 mm), the ring was pulled up, the major axis and minor axis of the composition spread round were measured, the average value was expressed as a flow value, and the fluidity was evaluated. Also, a prismatic specimen (2.3 cm) was formed using this composition, and immediately after demolding the next day, the temperature was lowered to 20 ° C.
After curing for 28 days in water and curing for 3 days in water at 80 ° C., the compressive strength was measured. The results are shown in Table 4. The same test was conducted by changing the type of cement to medium (M), white (W), and normal (N). As the dispersant, a copolymer of a polyoxyalkylene compound having an added mole number of oxyethylene of 68, maleic anhydride, and allylsulfonic acid was used, and the amount added was 1 part by weight based on 100 parts by weight of cement. Further, calcium nitrite or calcium thiocyanate was added as a soluble calcium salt in an amount shown in Table 4.
【００３０】表４に示すように、可溶性カルシウム塩を
添加したものは、初期強度の増進と流動性の向上が見ら
れ、かつ、また、長期の強度の低下も見られず、高強度
のセメント組成物を得る上で効果的である。As shown in Table 4, in the case where the soluble calcium salt was added, the increase in the initial strength and the improvement in the fluidity were observed, and the long-term strength was not reduced. It is effective in obtaining the composition.
【００３１】[0031]
【表４】 [Table 4]
Claims (7)
のを主体とする組成物であって、骨材が粒径５mm以下の
粉粒体であり、添加水量が体積比で２５％以下、分散剤
が一般式−(ＡＯ)ｎ−Ｒ（ＡＯは炭素数２から１２のオ
キシアルキレン基、Ｒは水素あるいは炭素数２から１２
の炭化水素基、(ＡＯ)ｎはｎがオキシアルキレン基の平
均付加モル数３０以上のポリオキシアルキレン基）で表
される分子構造を有するものであることを特徴とするセ
メント系組成物。1. A composition mainly comprising a cement and an aggregate to which a dispersant and water are added, wherein the aggregate is a powder having a particle size of 5 mm or less, and the amount of added water is 25% by volume. Hereinafter, the dispersant is represented by the general formula-(AO) n-R (AO is an oxyalkylene group having 2 to 12 carbon atoms, R is hydrogen or 2 to 12 carbon atoms)
(AO) n is a compound having a molecular structure represented by the formula: wherein n is a polyoxyalkylene group having an average number of moles of added oxyalkylene group of 30 or more).
シル基および/またはスルホン基を有する分散剤を用い
た請求項１に記載するセメント系組成物。2. The cement composition according to claim 1, wherein a dispersant having a carboxyl group and / or a sulfone group together with a polyoxyalkylene group is used.
量％以上である分散剤を用いた請求項１または２に記載
するセメント系組成物。3. The cement composition according to claim 1, wherein a dispersant having a polyoxyalkylene group content of 50% by weight or more in the molecule is used.
Ｃ)が０.５〜４である請求項１〜３のいずれかに記載す
るセメント系組成物。4. The weight ratio of aggregate (P) to cement (C) (P /
The cement composition according to any one of claims 1 to 3, wherein C) is 0.5 to 4.
て、粒径１μm未満の粒子４０重量部以下、粒径１μm〜
７５μmの粒子２００重量部以下、粒径７５μm〜５mmの
粒子４００重量部以下である請求項４に記載するセメン
ト系組成物。5. An aggregate comprising 40 parts by weight or less of particles having a particle size of less than 1 μm and a particle size of 1 μm to 100 parts by weight of cement.
The cement-based composition according to claim 4, wherein the particles are 200 parts by weight or less of 75 µm particles and 400 parts by weight or less of particles having a particle size of 75 µm to 5 mm.
骨材およびセメントに対して０.１〜５重量％である請
求項１〜５のいずれかに記載するセメント系組成物。6. The cement composition according to claim 1, wherein the amount of the dispersant added is 0.1 to 5% by weight based on the aggregate and the cement having a particle size of 75 μm or less.
加された請求項１〜６のいずれかに記載するセメント系
組成物。7. The cement composition according to claim 1, wherein a soluble calcium salt is added in addition to the dispersant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36058097A JP4420480B2 (en) | 1997-12-26 | 1997-12-26 | High-strength cementitious composition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36058097A JP4420480B2 (en) | 1997-12-26 | 1997-12-26 | High-strength cementitious composition |
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| Publication Number | Publication Date |
|---|---|
| JPH11189451A true JPH11189451A (en) | 1999-07-13 |
| JP4420480B2 JP4420480B2 (en) | 2010-02-24 |
Family
ID=18470023
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36058097A Expired - Fee Related JP4420480B2 (en) | 1997-12-26 | 1997-12-26 | High-strength cementitious composition |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002060262A (en) * | 2000-08-17 | 2002-02-26 | Taiheiyo Cement Corp | Dispersant for hydraulic composition |
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| JPH0648801A (en) * | 1992-03-11 | 1994-02-22 | W R Grace & Co | Highly fluid concrete composition |
| JPH06191918A (en) * | 1992-09-30 | 1994-07-12 | Takenaka Komuten Co Ltd | Hydraulic cement composition having ultrahigh strength |
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| JPH08217808A (en) * | 1995-02-09 | 1996-08-27 | Mitsubishi Chem Basf Co Ltd | Aqueous emulsion of multi-stage resin and polymer cement composition composed thereof |
| JPH08332471A (en) * | 1995-06-09 | 1996-12-17 | Sandoz Ag | Fixation of waste |
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| JPH11106248A (en) * | 1997-08-06 | 1999-04-20 | Nippon Shokubai Co Ltd | Cement admixture |
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1997
- 1997-12-26 JP JP36058097A patent/JP4420480B2/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03218956A (en) * | 1990-01-23 | 1991-09-26 | Nippon Steel Chem Co Ltd | Highly fluidized mortar |
| JPH0648801A (en) * | 1992-03-11 | 1994-02-22 | W R Grace & Co | Highly fluid concrete composition |
| JPH06191918A (en) * | 1992-09-30 | 1994-07-12 | Takenaka Komuten Co Ltd | Hydraulic cement composition having ultrahigh strength |
| JPH0748161A (en) * | 1993-07-19 | 1995-02-21 | Lion Corp | Precast cement product composition for building |
| JPH07267704A (en) * | 1994-03-31 | 1995-10-17 | Chichibu Onoda Cement Corp | Self-leveling aqueous composition |
| JPH08217808A (en) * | 1995-02-09 | 1996-08-27 | Mitsubishi Chem Basf Co Ltd | Aqueous emulsion of multi-stage resin and polymer cement composition composed thereof |
| JPH08332471A (en) * | 1995-06-09 | 1996-12-17 | Sandoz Ag | Fixation of waste |
| JPH09241058A (en) * | 1996-03-07 | 1997-09-16 | Chichibu Onoda Cement Corp | Cement additive |
| JPH11106248A (en) * | 1997-08-06 | 1999-04-20 | Nippon Shokubai Co Ltd | Cement admixture |
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| JP2002060262A (en) * | 2000-08-17 | 2002-02-26 | Taiheiyo Cement Corp | Dispersant for hydraulic composition |
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|---|---|
| JP4420480B2 (en) | 2010-02-24 |
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