JP2009155151A - Water reducing agent for cement composition and cement composition - Google Patents

Water reducing agent for cement composition and cement composition Download PDF

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Publication number
JP2009155151A
JP2009155151A JP2007334301A JP2007334301A JP2009155151A JP 2009155151 A JP2009155151 A JP 2009155151A JP 2007334301 A JP2007334301 A JP 2007334301A JP 2007334301 A JP2007334301 A JP 2007334301A JP 2009155151 A JP2009155151 A JP 2009155151A
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cement composition
water
reducing agent
cement
water reducing
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Yusuke Sugino
雄亮 杉野
Yasuhide Hojo
泰秀 北條
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Taiheiyo Materials Corp
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Taiheiyo Materials Corp
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/302Water reducers

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water reducing agent for a cement composition which exhibits excellent water reducing effect when used for the cement composition having low water-powder ratio of ≤35%. <P>SOLUTION: The cement composition contains a (meth)acrylic acid-based graft polymer and a soluble calcium salt. The soluble calcium salt is suitably a specific component. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明はセメント組成物用減水剤およびセメント組成物に関する。特に、セメントと粉末状混和材料との合計100質量部に対して水が15〜35質量部であると言った低水粉体比セメント組成物用減水剤およびセメント組成物に関する。   The present invention relates to a water reducing agent for a cement composition and a cement composition. In particular, the present invention relates to a water reducing agent for low water powder ratio cement composition and a cement composition in which water is 15 to 35 parts by mass with respect to 100 parts by mass in total of cement and powdered admixture.

土木工事、建築工事、或いはコンクリートブロックやヒューム管等のコンクリート二次製品の製造等において、コンクリートやモルタル等を混練により製造する場合、今や、減水剤(AE減水剤、高性能減水剤、高性能AE減水剤等のセメント分散剤)を使用することは、極、一般的である。なぜならば、減水剤は、コンクリートやモルタル等の所定のコンシステンシーを得る為に必要な水を減じることが出来、この結果、硬化後のコンクリートやモルタル等の物性が優れたものになるからである。このような減水剤として、ポリオキシエチレンを側鎖としたメタクリル酸塩又は無水マレイン酸の共重合体又は縮合体からなるポリカルボン酸系セメント減水剤が知られている(特許文献1)。尚、重合体に側鎖を付ける方法としてグラフト重合を用いることも知られている(特許文献2)。   When concrete, mortar, etc. are manufactured by kneading in civil engineering work, building work, or concrete secondary products such as concrete blocks and fume pipes, water reducing agents (AE water reducing agent, high performance water reducing agent, high performance) are now available. It is extremely common to use a cement dispersant such as an AE water reducing agent. This is because the water reducing agent can reduce the water required to obtain a predetermined consistency such as concrete and mortar, and as a result, the physical properties of concrete and mortar after curing will be excellent. . As such a water reducing agent, a polycarboxylic acid-based cement water reducing agent made of a copolymer or condensate of methacrylate or maleic anhydride having polyoxyethylene as a side chain is known (Patent Document 1). In addition, it is also known to use graft polymerization as a method for attaching a side chain to a polymer (Patent Document 2).

ところで、コンクリートやモルタル等の強度をより高める為、シリカフューム、高炉スラグ微粉末や特殊な粉末状の混和材料(例えば、太平洋マテリアル株式会社製の高強度混和材「ウルトラスーパーミックス」(商品名))等を添加し、セメントと粉末状の混和材料の合計(以下「粉体」と言う)の質量に対する使用する水の質量比を百分率で表した値(本発明においては「水粉体比」と言う)を低くすることが試みられている。
特開2000−327385号公報 特許第4001327号公報
By the way, in order to increase the strength of concrete, mortar, etc., silica fume, blast furnace slag fine powder and special powder admixture (for example, high strength admixture “Ultra Supermix” (trade name) manufactured by Taiheiyo Materials Co., Ltd.) Etc., and the mass ratio of water to be used to the total mass of cement and powdered admixture (hereinafter referred to as “powder”) expressed as a percentage (in the present invention, “water / powder ratio” Is trying to lower.
JP 2000-327385 A Japanese Patent No. 4001327

ところが、今日では、今までの減水剤よりも、更に減水することが可能な減水剤が求められている。   However, today, there is a demand for a water reducing agent that can further reduce water than conventional water reducing agents.

従って、本発明が解決しようとする第1の課題は、水粉体比が35%以下と言った低水粉体比のセメント組成物に用いた場合に、優れた減水性を奏するセメント組成物用減水剤を提供することである。   Accordingly, the first problem to be solved by the present invention is a cement composition that exhibits excellent water reduction when used in a cement composition having a low water powder ratio of 35% or less. Is to provide a water reducing agent.

本発明が解決しようとする第2の課題は、水粉体比が35%以下と言った低水粉体比のセメント組成物において、優れた減水性が奏されたセメント組成物を提供することである。   The second problem to be solved by the present invention is to provide a cement composition with excellent water reduction in a low water powder ratio cement composition having a water powder ratio of 35% or less. It is.

前記第1の課題は、
(メタ)アクリル酸系グラフトポリマーと、
可溶性カルシウム塩とを含有する
ことを特徴とするセメント組成物用減水剤によって解決される。
The first problem is
(Meth) acrylic acid-based graft polymer;
It solves by the water reducing agent for cement compositions characterized by containing a soluble calcium salt.

特に、(メタ)アクリル酸系グラフトポリマーと、
可溶性カルシウム塩とを含有してなり、
前記ポリマーに対する前記カルシウム塩の質量比が0.3〜5である
ことを特徴とするセメント組成物用減水剤によって解決される。
In particular, a (meth) acrylic acid-based graft polymer,
Containing a soluble calcium salt,
This is solved by a water reducing agent for cement composition, wherein the mass ratio of the calcium salt to the polymer is 0.3 to 5.

中でも、セメントと粉末状混和材料との合計100質量部に対して水が15〜35質量部であるセメント組成物に対する上記セメント組成物用減水剤によって解決される。   Especially, it solves with the said water reducing agent for cement compositions with respect to the cement composition whose water is 15-35 mass parts with respect to a total of 100 mass parts of cement and a powdery admixture.

前記第2の課題は、
上記のセメント組成物用減水剤の成分(A)と、
セメント、及び必要に応じて添加される粉末状混和材料(B)と、
水(C)とを含み、
前記(B)100質量部に対して、前記(A)が0.2〜8質量部、前記(C)が15〜35質量部である
ことを特徴とするセメント組成物によって解決される。
The second problem is
Component (A) of the water reducing agent for cement composition,
Cement, and powdered admixture (B) added as necessary;
Including water (C),
This is solved by the cement composition, wherein (A) is 0.2 to 8 parts by mass and (C) is 15 to 35 parts by mass with respect to 100 parts by mass of (B).

本発明のセメント組成物用減水剤は、水粉体比が35%以下の低水粉体比において、特に優れた減水性を奏する。すなわち、本発明のセメント組成物用減水剤を混練したコンクリートやモルタルは、水粉体比が35%以下の低水粉体比において、同じコンシステンシーを得るのに要する水の量を更に減じることが出来る。   The water reducing agent for cement composition of the present invention exhibits particularly excellent water reduction at a low water powder ratio of 35% or less. That is, concrete or mortar kneaded with the water reducing agent for cement composition of the present invention further reduces the amount of water required to obtain the same consistency at a low water powder ratio of 35% or less. I can do it.

この結果、本発明のセメント組成物用減水剤を混練したコンクリートやモルタル(セメント組成物)は、強度が、特に、優れている。又、水量が少ないので、乾燥収縮が小さく、ひび割れが起き難く、高耐久性のコンクリートやモルタルが得られる。   As a result, concrete and mortar (cement composition) kneaded with the water reducing agent for cement composition of the present invention are particularly excellent in strength. In addition, since the amount of water is small, drying shrinkage is small, cracking hardly occurs, and highly durable concrete and mortar can be obtained.

本発明はセメント組成物用減水剤である。特に、セメントと粉末状混和材料との合計100質量部に対して水が15〜35質量部の割合のセメント組成物用の減水剤である。そして、(メタ)アクリル酸系グラフトポリマーと、可溶性カルシウム塩とを含有する。特に、ポリマーに対するカルシウム塩の質量比が0.3〜5の割合で(メタ)アクリル酸系グラフトポリマーと可溶性カルシウム塩とを含有する。   The present invention is a water reducing agent for cement compositions. In particular, it is a water reducing agent for a cement composition in which water is in a proportion of 15 to 35 parts by mass with respect to a total of 100 parts by mass of cement and powdered admixture. And (meth) acrylic acid type graft polymer and soluble calcium salt are contained. In particular, the (meth) acrylic acid-based graft polymer and the soluble calcium salt are contained at a mass ratio of calcium salt to polymer of 0.3 to 5.

本発明になるセメント組成物は、上記のセメント組成物用減水剤の成分(A)と、セメント、及び必要に応じて添加される粉末状混和材料(B)と、水(C)とを含み、前記(B)100質量部に対して、前記(A)が0.2〜8質量部(特に、0.4質量部以上。5質量部以下。)、前記(C)が15〜35質量部(特に、20質量部以上。30質量部以下。)である。   The cement composition according to the present invention includes the water reducing agent component (A) described above, cement, and a powdery admixture (B) added as necessary, and water (C). The (A) is 0.2 to 8 parts by mass (particularly 0.4 parts by mass or more and 5 parts by mass or less) and the (C) is 15 to 35 parts by mass with respect to 100 parts by mass of the (B). Part (particularly 20 parts by mass or more and 30 parts by mass or less).

更に詳しく説明する。
本発明で用いられる(メタ)アクリル酸系グラフトポリマーは、例えば下記一般式で表されるポリマーポリマー(一般式中、m,aは1以上の任意の整数。n,lは0以上の任意の整数。)が挙げられる。
例えば、オレフィンモノカルボン酸及びその塩から選ばれる一種又は二種以上、アルコキシポリエチレングリコール(メタ)アクリレート及び(メタ)アクリルスルホン酸塩から選ばれる一種又は二種以上、並びに(メタ)アクリル酸アルキル及びヒドロキシアルキル(メタ)アクリレートから選ばれる一種又は二種以上を含む水溶性ビニル共重合体を好ましいものとして挙げることが出来る。特に、メトキシポリエチレングリコール(メタ)アクリレート、メタクリル酸又はその塩及び(メタ)アクリルスルホン酸塩を含む水溶性ビニル共重合体を好ましいものとして挙げることが出来る。尚、トリエタノールアミンやホルムアルデヒドを実質的に含まない(メタ)アクリル酸系グラフトポリマーは、環境負荷が小さいので、特に、好ましい。
This will be described in more detail.
The (meth) acrylic acid-based graft polymer used in the present invention is, for example, a polymer polymer represented by the following general formula (in the general formula, m and a are arbitrary integers of 1 or more. N and l are arbitrary integers of 0 or more. Integer).
For example, one or more selected from olefin monocarboxylic acids and salts thereof, one or more selected from alkoxy polyethylene glycol (meth) acrylate and (meth) acryl sulfonate, and alkyl (meth) acrylate and A water-soluble vinyl copolymer containing one or more selected from hydroxyalkyl (meth) acrylates can be mentioned as a preferable example. In particular, water-soluble vinyl copolymers containing methoxypolyethylene glycol (meth) acrylate, methacrylic acid or a salt thereof and (meth) acrylsulfonic acid salt can be mentioned as preferable ones. A (meth) acrylic acid-based graft polymer substantially free of triethanolamine or formaldehyde is particularly preferable because it has a small environmental load.

本発明で用いる可溶性カルシウム塩としては、亜硝酸カルシウム、硝酸カルシウム、塩化カルシウム、蟻酸カルシウム等が挙げられる。亜硝酸カルシウムや硝酸カルシウムは特に好ましい。中でも、亜硝酸カルシウムは、モルタルやコンクリートに埋設または接する鉄筋や鋼鈑等の鋼材の発錆を抑制することができことから、好ましい。尚、亜硝酸カルシウムや硝酸カルシウムを使用する場合、これらの化合物は潮解性があることから、水溶液の状態で使用することが好ましい。   Examples of the soluble calcium salt used in the present invention include calcium nitrite, calcium nitrate, calcium chloride, calcium formate and the like. Calcium nitrite and calcium nitrate are particularly preferred. Among these, calcium nitrite is preferable because it can suppress rusting of steel materials such as reinforcing bars and steel rods embedded or in contact with mortar or concrete. In addition, when using calcium nitrite and calcium nitrate, since these compounds have deliquescence, it is preferable to use in the state of aqueous solution.

メタクリル酸系グラフトポリマーに対する可溶性カルシウム塩の質量比は0.3〜5であることが好ましい。その理由は、0.3未満の小さ過ぎた場合には、減水効果が小さいからである。逆に、5を越えて大き過ぎた場合にも、大きな減水効果が得られないからである。可溶性カルシウム塩の更に好ましい質量比は0.4〜3である。特に、該質量比が0.45〜2.5の場合には、減水効果が更に大きなものとなる。   The mass ratio of the soluble calcium salt to the methacrylic acid-based graft polymer is preferably 0.3 to 5. The reason is that the water reducing effect is small when it is too small, less than 0.3. On the contrary, even if it exceeds 5 and is too large, a large water reduction effect cannot be obtained. A more preferable mass ratio of the soluble calcium salt is 0.4-3. In particular, when the mass ratio is 0.45 to 2.5, the water reduction effect is further increased.

本発明のセメント組成物には、本発明のセメント組成物用減水剤、特に、低水粉体比セメント組成物用減水剤の他にも、各種の混和材料を含有しても良い。例えば、増粘剤、セメント用ポリマ、発泡剤、起泡剤、防水材、防錆剤、収縮低減剤、保水剤、顔料、繊維、撥水剤、白華防止剤、膨張材(剤)、急結剤(材)、急硬剤(材)、消泡剤、高炉スラグ微粉末、石粉、シリカフューム、火山灰、表面硬化剤、保水剤等が挙げられる。   The cement composition of the present invention may contain various admixtures in addition to the water reducing agent for cement composition of the present invention, in particular, the water reducing agent for low water powder ratio cement composition. For example, thickener, cement polymer, foaming agent, foaming agent, waterproofing material, rust preventive agent, shrinkage reducing agent, water retention agent, pigment, fiber, water repellent agent, whitening prevention agent, expansion material (agent), Examples thereof include a rapid setting agent (material), a rapid hardening agent (material), an antifoaming agent, fine powder of blast furnace slag, stone powder, silica fume, volcanic ash, a surface hardening agent, and a water retention agent.

本発明のセメント組成物用減水剤の製造方法は、特には限定されない。例えば、パン型コンクリートミキサ、パグミル型コンクリートミキサ、重力式コンクリートミキサ、ヘンシェル式ミキサ、リボンミキサ、グラウトミキサ、ハンドミキサ、左官ミキサ、ラインミキサ等のミキサ或いは容器内での攪拌により、(メタ)アクリル酸系グラフトポリマーと可溶性カルシウム塩とを混合することで製造できる。この時に用いるミキサは、連続式ミキサでもバッチ式ミキサでも良い。各材料のミキサ内への投入順序は特に限定されない。一種ずつ添加してもよく、一部又は全部を同時に添加してもよい。   The method for producing the water reducing agent for cement composition of the present invention is not particularly limited. For example, (Meth) acrylic by stirring in a mixer or container such as a bread type concrete mixer, pug mill type concrete mixer, gravity concrete mixer, Henschel type mixer, ribbon mixer, grout mixer, hand mixer, plaster mixer, line mixer It can be produced by mixing an acid-based graft polymer and a soluble calcium salt. The mixer used at this time may be a continuous mixer or a batch mixer. The order in which each material is charged into the mixer is not particularly limited. One by one may be added, or part or all may be added simultaneously.

本発明のセメント組成物用減水剤は、各成分が上記製造方法によって予め混合されていても良い。しかしながら、セメント組成物中に別々に添加されても良い。従って、予め混合された形態でなくても良い。そして、本発明のセメント組成物用減水剤は、セメントに水と共に添加・混合される。   In the water reducing agent for cement composition of the present invention, each component may be preliminarily mixed by the above production method. However, it may be added separately in the cement composition. Therefore, it may not be a premixed form. And the water reducing agent for cement composition of this invention is added and mixed with water with cement.

本発明のセメント組成物は、前記セメント組成物用減水剤の他に、セメント及び水が、最低限、含まれる。そして、必要に応じて、各種の骨材・混和材料などが含まれる。例えば、細骨材、粗骨材、及び各種の混和材料などである。混和材料としては、例えば増粘剤、セメント用ポリマー、発泡剤、起泡剤、防水材、防錆剤、収縮低減剤、保水剤、顔料、繊維、撥水剤、白華防止剤、膨張材(剤)、急結剤(材)、急硬剤(材)、消泡剤、高炉スラグ微粉末、石粉、シリカフューム、火山灰、表面硬化剤、保水剤等が挙げられる。細骨材としては、川砂、陸砂、海砂、砕砂、珪砂及び人工軽量細骨材等が挙げられる。粗骨材としては、川砂利、陸砂利、砕石及び人工骨材等が挙げられる。そして、これらは、適宜、一種又は二種以上が用いられる。   The cement composition of the present invention contains at least cement and water in addition to the water reducing agent for cement composition. And various aggregates and admixtures are included as needed. For example, fine aggregates, coarse aggregates, and various admixtures. Examples of admixtures include thickeners, polymers for cement, foaming agents, foaming agents, waterproofing materials, rust preventives, shrinkage reducing agents, water retention agents, pigments, fibers, water repellents, white flower preventing agents, and expansion materials. (Agent), quick setting agent (material), rapid hardening agent (material), antifoaming agent, blast furnace slag fine powder, stone powder, silica fume, volcanic ash, surface hardener, water retention agent and the like. Examples of the fine aggregate include river sand, land sand, sea sand, crushed sand, silica sand, and artificial lightweight fine aggregate. Examples of the coarse aggregate include river gravel, land gravel, crushed stone, and artificial aggregate. And these are 1 type, or 2 or more types is used suitably.

本発明のセメント組成物で使用するセメントとしては、普通、早強、超早強、低熱及び中庸熱等の各種ポルトランドセメント、エコセメント、並びにこれらポルトランドセメント又はエコセメントに、フライアッシュ、高炉スラグ、シリカフューム又は石灰石微粉末等を混合した各種混合セメント、太平洋セメント社製「ジェットセメント」(商品名)や住友大阪セメント社製「ジェットセメント」(商品名)等の超速硬セメント、アルミナセメント等が挙げられる。尚、これらは、一種単独で用いたり、二種以上併用する場合もある。   As the cement used in the cement composition of the present invention, various portland cements such as normal, early strength, super early strength, low heat and moderate heat, eco cement, and portland cement or eco cement, fly ash, blast furnace slag, Various cements mixed with silica fume or fine powder of limestone, super-fast cements such as “Jet Cement” (trade name) manufactured by Taiheiyo Cement Co., Ltd. and “Jet Cement” (trade name) manufactured by Sumitomo Osaka Cement Co., alumina cement, etc. It is done. In addition, these may be used individually by 1 type, or may be used together 2 or more types.

上記セメント組成物と混練する水は、水道水が推奨される。但し、水道水に限定されるものでもない。混和材料に含まれる水を用いてもよい。この場合に用いる水の量は、セメント組成物中のセメントと粉末状の混和材料を合わせて粉体として、100質量部に対して15質量部〜35質量部とすることが好ましい。特に好ましくは20〜30質量部である。すなわち、水粉体比を15〜35%、特に、20〜30%とすることが好ましい。尚、セメント組成物用減水剤又はその一部が水溶液の場合は、該水溶液の質量を差し引いて上記セメント組成物に添加する。すなわち、水粉体比における水の量は、セメント組成物中に含まれる全水量である。   As water to be kneaded with the cement composition, tap water is recommended. However, it is not limited to tap water. You may use the water contained in an admixture. The amount of water used in this case is preferably 15 parts by mass to 35 parts by mass with respect to 100 parts by mass as the powder of the cement in the cement composition and the powdered admixture. Especially preferably, it is 20-30 mass parts. That is, the water powder ratio is preferably 15 to 35%, particularly 20 to 30%. In addition, when the water reducing agent for cement composition or a part thereof is an aqueous solution, the mass of the aqueous solution is subtracted and added to the cement composition. That is, the amount of water in the water powder ratio is the total amount of water contained in the cement composition.

以下、本発明を更に具体的に説明するが、これによって本発明は限定されるものでは無い。   Hereinafter, the present invention will be described more specifically, but the present invention is not limited thereto.

[実施例]
表1に示す配合割合のモルタルを各水準約1.5Lとなる量を作製した。
この作製されたモルタルの品質試験(コンシステンシー試験及び圧縮強度試験)を行った。その結果を、表2に示す。
[Example]
The amount of the mortar having a blending ratio shown in Table 1 was made to be about 1.5 L at each level.
The produced mortar was subjected to quality tests (consistency test and compressive strength test). The results are shown in Table 2.

尚、この時の使用材料、粉体の作製方法、モルタルの作製方法、及び品質試験方法を以下に示す。
供試体作成、及び練り混ぜは、全て、20℃で行い、使用材料の温度も20℃とした上で試験を行った。
<使用材料>
セメント:早強ポルトランドセメント(太平洋セメント株式会社製) (記号:C)
粉末状の混和材料1:高強度混和材(商品名「ウルトラスーパーミックス」)(太平洋マテリアル株式会社製) (記号:USM)
粉末状の混和材料2:消泡剤(商品名「SNディフォーマーAHP」)(サンノプコ株式会社製) (記号:AHP)
骨材:陸砂(粗粒率;2.67,比重;2.60) (記号:S)
水:水道水 (記号:W)
メタクリル酸系グラフトポリマー水溶液:メトキシポリエチレングリコールメタクリレート、メタクリル酸の塩及びメタリルスルホン酸塩を含む水溶性ビニル共重合体の水溶液(トリエタノールアミン及びホルムアルデヒドを実質的に含まない)(濃度;25%) (記号:MCP)
β−ナフタリンスルホン酸ホルマリン縮合物の水溶液:(濃度;48%) (記号:NS)
可溶性カルシウム塩1:亜硝酸カルシウムの水溶液(濃度;30%)(記号:Ca30)
可溶性カルシウム塩2:亜硝酸カルシウム及び硝酸カルシウムが質量比で50:50含まれる水溶液(濃度;45%)(記号:Ca45)
<粉体の作製>
作製するモルタル組成物の体積(空気量を除く。)が約1.5Lとなる量の表1に示す割合の各材料の中、セメントと粉末状混和材料とを、ポリ袋(縦500mm×横250mm×厚さ0.04mm)に投入し、密閉した後、30秒間手で振り、各材料を混合して粉体を得た。
<モルタルの作製方法>
ホバート社製ミキサの容器に、水および骨材を入れ、15秒間混練した。この後、上記粉体を加え、90秒間混練してモルタルを作製した。尚、この間に、一度、ミキサを止め、攪拌羽根に付着したモルタルを掻き落した。
<品質試験方法>
[コンシステンシー試験]
製造した各モルタルの練り混ぜ直後における、JIS R 5201「セメントの物理試験方法」11.フロー試験に準じて、落下運動を行わずに静置した状態でのフロー値(以下、「静置フロー値」という。)を測定した。
[圧縮強度試験]
土木学会規準JSCE−G 541「充填モルタルの圧縮強度試験方法」に準じ、圧縮強度を測定した。養生方法は、次の2通りの養生方法とした。
養生方法1:材齢1日で脱型後、材齢7日まで20℃気中養生とした。
養生方法2:20℃で4時間静置後、20℃/時間で80℃まで昇温。その後80℃を保持し、練り混ぜ終了から20時間で蒸気養生槽より取り出し、20℃で保管。
The materials used at this time, the powder production method, the mortar production method, and the quality test method are shown below.
The specimen preparation and kneading were all performed at 20 ° C., and the test was performed after the temperature of the material used was set to 20 ° C.
<Materials used>
Cement: Early strong Portland cement (manufactured by Taiheiyo Cement Co., Ltd.) (Code: C)
Powdered admixture 1: High-strength admixture (trade name “Ultra Supermix”) (manufactured by Taiheiyo Materials Co., Ltd.) (Code: USM)
Powdered admixture 2: Antifoaming agent (trade name “SN deformer AHP”) (manufactured by San Nopco Co., Ltd.) (symbol: AHP)
Aggregate: Land sand (Coarse grain ratio: 2.67, Specific gravity: 2.60) (Symbol: S)
Water: Tap water (Symbol: W)
Aqueous solution of methacrylic acid-based graft polymer: aqueous solution of water-soluble vinyl copolymer containing methoxypolyethylene glycol methacrylate, methacrylic acid salt and methallyl sulfonate (substantially free of triethanolamine and formaldehyde) (concentration: 25% (Symbol: MCP)
β-Naphthalenesulfonic acid formalin condensate aqueous solution: (concentration: 48%) (symbol: NS)
Soluble calcium salt 1: aqueous solution of calcium nitrite (concentration: 30%) (symbol: Ca30)
Soluble calcium salt 2: Aqueous solution containing 50:50 calcium nitrite and calcium nitrate (concentration: 45%) (symbol: Ca45)
<Preparation of powder>
Among the materials in the proportions shown in Table 1 in which the volume of the mortar composition (excluding the amount of air) is about 1.5 L, cement and powdered admixture are placed in a plastic bag (length 500 mm × width 250 mm × thickness 0.04 mm) and sealed, and then shaken by hand for 30 seconds to mix the materials and obtain powder.
<Mortar production method>
Water and aggregate were put into a container of a mixer manufactured by Hobart and kneaded for 15 seconds. Thereafter, the powder was added and kneaded for 90 seconds to prepare a mortar. During this time, the mixer was once stopped and the mortar adhered to the stirring blade was scraped off.
<Quality test method>
[Consistency test]
10. JIS R 5201 “Physical testing method of cement” immediately after mixing of each mortar produced. According to the flow test, the flow value in a state of standing without performing a drop motion (hereinafter referred to as “static flow value”) was measured.
[Compressive strength test]
The compressive strength was measured according to JSCE-G 541 “Testing method for compressive strength of filled mortar”. The curing method was the following two curing methods.
Curing method 1: After demolding at a material age of 1 day, it was kept at 20 ° C. in air until the material age was 7 days.
Curing method 2: After standing at 20 ° C. for 4 hours, the temperature was raised to 80 ° C. at 20 ° C./hour. Thereafter, the temperature is maintained at 80 ° C., taken out from the steam curing tank within 20 hours from the end of mixing, and stored at 20 ° C.

表1
Table 1

表2
Table 2

この表1,2から、本発明のセメント組成物用減水剤は、水粉体比が35%以下の低水粉体比において、特に優れた減水性を備えることが判る。そして、水粉体比が35%以下の高強度コンクリート、高強度モルタル、高耐久性コンクリート、高耐久性モルタルの製造に好適である。

特許出願人 太平洋マテリアル株式会社
代 理 人 宇 高 克 己
From Tables 1 and 2, it can be seen that the water reducing agent for cement composition of the present invention has particularly excellent water reduction at a low water powder ratio of 35% or less. And it is suitable for manufacture of high-strength concrete, high-strength mortar, highly durable concrete, and highly durable mortar whose water powder ratio is 35% or less.

Patent Applicant Taiheiyo Material Co., Ltd.
Representative Katsumi Udaka

Claims (5)

(メタ)アクリル酸系グラフトポリマーと、
可溶性カルシウム塩とを含有する
ことを特徴とするセメント組成物用減水剤。
(Meth) acrylic acid-based graft polymer;
A water reducing agent for a cement composition, comprising a soluble calcium salt.
(メタ)アクリル酸系グラフトポリマーと、
可溶性カルシウム塩とを含有してなり、
前記ポリマーに対する前記カルシウム塩の質量比が0.3〜5である
ことを特徴とするセメント組成物用減水剤。
(Meth) acrylic acid-based graft polymer;
Containing a soluble calcium salt,
A water reducing agent for a cement composition, wherein a mass ratio of the calcium salt to the polymer is 0.3 to 5.
可溶性カルシウム塩が亜硝酸カルシウム及び硝酸カルシウムの群の中から選ばれる一種または二種である
ことを特徴とする請求項1または請求項2のセメント組成物用減水剤。
The water-reducing agent for a cement composition according to claim 1 or 2, wherein the soluble calcium salt is one or two selected from the group consisting of calcium nitrite and calcium nitrate.
セメントと粉末状混和材料との合計100質量部に対して水が15〜35質量部であるセメント組成物用減水剤である
ことを特徴とする請求項1〜請求項3いずれかのセメント組成物用減水剤。
The cement composition according to any one of claims 1 to 3, wherein the cement composition is a water reducing agent for cement composition in which water is 15 to 35 parts by mass with respect to 100 parts by mass in total of cement and powdered admixture. Water reducing agent.
請求項1〜請求項4いずれかのセメント組成物用減水剤の成分(A)と、
セメント、及び必要に応じて添加される粉末状混和材料(B)と、
水(C)とを含み、
前記(B)100質量部に対して、前記(A)が0.2〜8質量部、前記(C)が15〜35質量部である
ことを特徴とするセメント組成物。
The component (A) of the water reducing agent for cement composition according to any one of claims 1 to 4,
Cement, and powdered admixture (B) added as necessary;
Including water (C),
The cement composition, wherein (A) is 0.2 to 8 parts by mass and (C) is 15 to 35 parts by mass with respect to 100 parts by mass of (B).
JP2007334301A 2007-12-26 2007-12-26 Water reducing agent for cement composition and cement composition Pending JP2009155151A (en)

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