JPH092855A - High-early-strength concrete composition - Google Patents
High-early-strength concrete compositionInfo
- Publication number
- JPH092855A JPH092855A JP17933295A JP17933295A JPH092855A JP H092855 A JPH092855 A JP H092855A JP 17933295 A JP17933295 A JP 17933295A JP 17933295 A JP17933295 A JP 17933295A JP H092855 A JPH092855 A JP H092855A
- Authority
- JP
- Japan
- Prior art keywords
- water
- early
- cement
- concrete composition
- mol
- 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
- C04B24/2688—Copolymers containing at least three different monomers
-
- 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
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/40—Surface-active agents, dispersants
- C04B2103/408—Dispersants
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は早強コンクリート組成物
に関する。得られる硬化物に早期強度を発現させて工期
の短縮及び工事の省力化を図るため、早強コンクリート
組成物が使用されている。かかる早強コンクリート組成
物は、セメントとして早強ポルトランドセメントを用
い、更に水、細骨材、粗骨材及びセメント分散剤を用い
て調製したものである。本発明は、調製したコンクリー
ト組成物の流動性の経時的低下を小さくし、同時に該コ
ンクリート組成物から得られる硬化物に充分な早期強度
を発現させ、また乾燥収縮によるひび割れに対する抵抗
性（以下、ひび割れ抵抗性という）を高めることができ
る早強コンクリート組成物に関するものである。FIELD OF THE INVENTION The present invention relates to a high-strength concrete composition. Early-strength concrete compositions are used in order to develop early strength in the obtained cured product to shorten the construction period and save labor in construction. This early-strength concrete composition is prepared by using early-strength Portland cement as cement, and further using water, fine aggregate, coarse aggregate and cement dispersant. The present invention reduces a decrease in fluidity of a prepared concrete composition with time, at the same time expresses sufficient early strength in a cured product obtained from the concrete composition, and also resistance to cracking due to drying shrinkage (hereinafter, The present invention relates to a high-strength concrete composition capable of increasing crack resistance).
【０００２】[0002]
【従来の技術】従来、早強コンクリート組成物として
は、前記したようにセメントとして早強ポルトランドセ
メントを用い、更に水、細骨材、粗骨材及びセメント分
散剤を用いて調製したものが使用されている。そしてこ
の場合、セメント分散剤としては、セメントとして普通
ポルトランドセメントを用いた通常のコンクリート組成
物を調製する場合と同様、各種の水溶性ビニル共重合
体、なかでも（メタ）アクリル酸塩とメタリルスルホン
酸塩と（メタ）アクリル酸メチルとメトキシポリエトキ
シエチルメタクリレートとの４種の共重合成分から得ら
れる水溶性ビニル共重合体が使用されている（特公平５
−１１０５７、特開平４−２０９６１３）。ところが、
セメントとして早強ポルトランドセメントを用い、また
高度に減水した早強コンクリート組成物の調製におい
て、通常のコンクリート組成物を調製する場合と同様、
セメント分散剤として上記のような水溶性ビニル共重合
体を用いると、調製した早強コンクリート組成物の流動
性の経時的低下が大きく、また得られる硬化物の早期強
度の発現が不充分で、しかもひび割れ抵抗性が低いとい
う欠点がある。2. Description of the Related Art Conventionally, as a high-strength concrete composition, as described above, a high-strength Portland cement was used as a cement, and further, water, fine aggregate, coarse aggregate and cement dispersant were used. Has been done. In this case, as the cement dispersant, various water-soluble vinyl copolymers, especially (meth) acrylic acid salt and methallyl salt, as in the case of preparing a normal concrete composition using ordinary Portland cement as cement. A water-soluble vinyl copolymer obtained from four copolymer components of sulfonate, methyl (meth) acrylate, and methoxypolyethoxyethyl methacrylate is used (Japanese Patent Publication No.
-11057, JP-A-4-209613). However,
Using early strength Portland cement as a cement, also in the preparation of a highly water-reduced early strength concrete composition, as in the case of preparing a normal concrete composition,
When the water-soluble vinyl copolymer as described above is used as the cement dispersant, the fluidity of the prepared early-strength concrete composition is largely decreased with time, and the early strength of the obtained cured product is insufficiently expressed, Moreover, it has the drawback of low crack resistance.
【０００３】[0003]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、従来の早強コンクリート組成物では、コン
クリート組成物の流動性の経時的低下が大きく、また得
られる硬化物の早期強度の発現が不充分で、しかもひび
割れ抵抗性が低い点である。The problem to be solved by the present invention is that in the conventional fast-strength concrete composition, the fluidity of the concrete composition is largely decreased with time, and the early strength of the obtained cured product is The point is that expression is insufficient and crack resistance is low.
【０００４】[0004]
【課題を解決するための手段】しかして本発明者らは、
上記の課題を解決するべく研究した結果、セメントとし
て早強ポルトランドセメントを用い、更に水、細骨材、
粗骨材及びセメント分散剤を用いて調製した早強コンク
リート組成物において、水／セメント比、単位水量、細
骨材の単位量及び粗骨材の単位量をそれぞれ所定範囲に
設定し、且つセメント分散剤としてフェノキシポリエト
キシエチルメタクリレートを１種の共重合成分として含
む４種の共重合成分から得られる特定の水溶性ビニル共
重合体を用い、かかるセメント分散剤を早強ポルトラン
ドセメントに対し所定割合で用いたものが正しく好適で
あることを見出した。Means for Solving the Problems Thus, the present inventors have
As a result of research to solve the above problems, using early strength Portland cement as cement, water, fine aggregate,
In a high-strength concrete composition prepared using a coarse aggregate and a cement dispersant, the water / cement ratio, the unit amount of water, the unit amount of the fine aggregate and the unit amount of the coarse aggregate are each set in a predetermined range, and the cement A specific water-soluble vinyl copolymer obtained from four copolymerization components containing phenoxypolyethoxyethyl methacrylate as one copolymerization component is used as a dispersant, and the cement dispersant is contained in a predetermined ratio with respect to early strength Portland cement. It was found that the one used in 1. was correct and suitable.
【０００５】すなわち本発明は、セメントとして早強ポ
ルトランドセメントを用い、更に水、細骨材、粗骨材及
びセメント分散剤を用いて調製した早強コンクリート組
成物において、水／セメント比が３０〜６５％、単位水
量が１４０〜１８５kg／ｍ3、細骨材の単位量が７００
〜１２００kg／ｍ3及び粗骨材の単位量が８００〜１２
００kg／ｍ3であり、且つ早強ポルトランドセメント１
００重量部に対して下記のセメント分散剤を０．１〜
２．０重量部の割合で用いて成ることを特徴とする早強
コンクリート組成物に係る。That is, according to the present invention, a high-strength concrete composition prepared by using early-strength Portland cement as cement, and further using water, fine aggregate, coarse aggregate and cement dispersant, has a water / cement ratio of 30 to 30. 65%, the unit water amount is 140-185 kg / m 3 , the unit amount of fine aggregate is 700
~ 1200kg / m 3 and unit amount of coarse aggregate is 800 ~ 12
00kg / m 3 and early strength Portland cement 1
0.1 parts by weight of the following cement dispersant is used.
A high-strength concrete composition characterized by being used in a ratio of 2.0 parts by weight.
【０００６】セメント分散剤：下記の式１で示される構
成単位Ａ、下記の式２で示される構成単位Ｂ、下記の式
３で示される構成単位Ｃ及び下記の式４で示される構成
単位Ｄで構成された水溶性ビニル共重合体であって、全
構成単位中、構成単位Ａが４５〜６５モル％、構成単位
Ｂが２〜１５モル％、構成単位Ｃが５〜２０モル％及び
構成単位Ｄが１０〜４０モル％を占め、且つ数平均分子
量が２０００〜２００００である水溶性ビニル共重合
体。Cement dispersant: structural unit A represented by the following formula 1, structural unit B represented by the following formula 2, structural unit C represented by the following formula 3, and structural unit D represented by the following formula 4. A structural unit A is 45 to 65 mol%, a structural unit B is 2 to 15 mol%, a structural unit C is 5 to 20 mol%, and a water-soluble vinyl copolymer composed of A water-soluble vinyl copolymer in which the unit D accounts for 10 to 40 mol% and the number average molecular weight is 2000 to 20000.
【０００７】[0007]
【式１】 (Equation 1)
【式２】 (Equation 2)
【式３】 (Equation 3)
【式４】 (Equation 4)
【０００８】（式１〜式４において、 Ｒ1，Ｒ2：Ｈ又はＣＨ3 Ｒ3：フェニル基 Ｍ1，Ｍ2：アルカリ金属、アルカリ土類金属及び有機ア
ミンから選ばれるカチオン基 ｍ：５〜４５の整数）(In the formulas 1 to 4, R 1 , R 2 : H or CH 3 R 3 : phenyl group M 1 , M 2 : cation group selected from alkali metal, alkaline earth metal and organic amine m: 5 ~ Integer of 45)
【０００９】本発明の早強コンクリート組成物は、セメ
ントとして早強ポルトランドセメントを用い、更に水、
細骨材、粗骨材及びセメント分散剤を用いて調製したも
のである。かかる早強コンクリート組成物において、本
発明では、水／セメント比を３０〜６５％とするが、４
０〜６０％とするのが好ましい。また単位水量を１４０
〜１８５kg／ｍ3とするが、１５０〜１８０kg／ｍ3とす
るのが好ましい。更に細骨材の単位量を７００〜１２０
０kg／ｍ3とするが、７５０〜１１００kg／ｍ3とするの
が好ましい。そして粗骨材の単位量を８００〜１２００
kg／ｍ3とするが、８５０〜１１５０kg／ｍ3とするのが
好ましい。The early-strength concrete composition of the present invention uses early-strength Portland cement as cement, and further comprises water,
It was prepared using fine aggregate, coarse aggregate and cement dispersant. In the present invention, the water / cement ratio is 30 to 65% in such a high-strength concrete composition.
It is preferably 0 to 60%. The unit water volume is 140
And ~185kg / m 3, but is preferably a 150~180kg / m 3. Further, the unit amount of fine aggregate is 700 to 120
And 0 kg / m 3, but is preferably a 750~1100kg / m 3. And the unit amount of coarse aggregate is 800 to 1200
and kg / m 3, but is preferably a 850~1150kg / m 3.
【００１０】本発明で用いるセメントは、ＪＩＳ−Ｒ５
２１０に適合する早強ポルトランドセメントである。ま
た本発明で用いる細骨材は、特にその種類を制限するも
のではなく、いずれも公知の川砂、海砂、山砂、砕砂等
である。更に本発明で用いる粗骨材は、これも特にその
種類を制限するものではなく、いずれも公知の川砂利、
砕石、軽量骨材等である。The cement used in the present invention is JIS-R5.
It is a high-strength Portland cement conforming to 210. Further, the fine aggregate used in the present invention is not particularly limited in its type, and all are known river sand, sea sand, mountain sand, crushed sand and the like. Further, the coarse aggregate used in the present invention is not particularly limited in its type, and both are known river gravel,
Examples include crushed stone and lightweight aggregate.
【００１１】本発明で用いるセメント分散剤は、前記し
た式１〜式４で示される構成単位Ａ〜Ｄで構成されたも
のである。これらの構成単位Ａ〜Ｄはそれぞれ相当する
ビニル単量体を共重合することによって形成される。The cement dispersant used in the present invention is composed of the structural units A to D represented by the above formulas 1 to 4. These structural units A to D are formed by copolymerizing the corresponding vinyl monomers.
【００１２】式１で示される構成単位Ａを形成すること
となるビニル単量体としては、１）メタクリル酸のアル
カリ金属塩、アルカリ土類金属塩及び有機アミン塩、
２）アクリル酸のアルカリ金属塩、アルカリ土類金属塩
及び有機アミン塩がある。なかでもメタクリル酸のナト
リウムやカリウム等のアルカリ金属塩が好ましい。The vinyl monomer forming the constitutional unit A represented by the formula 1 includes 1) an alkali metal salt of methacrylic acid, an alkaline earth metal salt and an organic amine salt,
2) There are alkali metal salts, alkaline earth metal salts and organic amine salts of acrylic acid. Of these, alkali metal salts of methacrylic acid such as sodium and potassium are preferable.
【００１３】式２で示される構成単位Ｂを形成すること
となるビニル単量体としては、メタリルスルホン酸のア
ルカリ金属塩、アルカリ土類金属塩及び有機アミン塩が
ある。なかでもメタリルスルホン酸のナトリウムやカリ
ウム等のアルカリ金属塩が好ましい。The vinyl monomer forming the structural unit B represented by the formula 2 includes alkali metal salts, alkaline earth metal salts and organic amine salts of methallyl sulfonic acid. Of these, alkali metal salts of methallyl sulfonic acid such as sodium and potassium are preferable.
【００１４】式３で示される構成単位Ｃを形成すること
となるビニル単量体としては、メチルアクリレート及び
メチルメタクリレートがある。The vinyl monomer forming the structural unit C represented by the formula 3 includes methyl acrylate and methyl methacrylate.
【００１５】式４で示される構成単位Ｄを形成すること
となるビニル単量体としては、いずれもオキシエチレン
単位の繰り返し数が５〜４５であるフェノキシポリエト
キシエチルメタクリレートがある。なかでもオキシエチ
レン単位の繰り返し数が１５〜４０であるフェノキシポ
リエトキシエチルメタクリレートが好ましい。As the vinyl monomer forming the structural unit D represented by the formula 4, there is phenoxypolyethoxyethyl methacrylate in which the number of repeating oxyethylene units is 5 to 45. Of these, phenoxypolyethoxyethyl methacrylate having a repeating number of oxyethylene units of 15 to 40 is preferable.
【００１６】本発明のセメント分散剤は以上説明したよ
うな構成単位Ａ〜Ｄで構成された水溶性ビニル共重合体
であって、これらの全構成単位中、構成単位Ａを４５〜
６５モル％、好ましくは５０〜６５モル％、構成単位Ｂ
を２〜１５モル％、好ましくは３〜１５モル％、構成単
位Ｃを５〜２０モル％、好ましくは７〜２０モル％、構
成単位Ｄを１０〜４０モル％、好ましくは１５〜３５モ
ル％の割合で有する水溶性ビニル共重合体である。The cement dispersant of the present invention is a water-soluble vinyl copolymer composed of the structural units A to D as described above, and the structural unit A is 45 to 45% of all the structural units.
65 mol%, preferably 50-65 mol%, structural unit B
2 to 15 mol%, preferably 3 to 15 mol%, the structural unit C is 5 to 20 mol%, preferably 7 to 20 mol%, the structural unit D is 10 to 40 mol%, preferably 15 to 35 mol% Is a water-soluble vinyl copolymer having a ratio of.
【００１７】本発明によれば、水溶性ビニル共重合体を
構成する構成単位Ａ〜Ｄのうちで、末端にフェニル基を
持つポリオキシエチレン鎖を有する構成単位Ｄ及びその
構成割合が特に重要である。構成単位Ｄを所定割合で有
する前記した特定の水溶性ビニル共重合体をセメント分
散剤として早強ポルトランドセメントに対し所定量用い
ることが、本発明の早強コンクリート組成物において、
流動性の経時的低下を小さくし、同時に得られる硬化物
に充分な早期強度を発現させ、しかもひび割れ抵抗性を
高めることになる。According to the present invention, among the constitutional units A to D constituting the water-soluble vinyl copolymer, the constitutional unit D having a polyoxyethylene chain having a phenyl group at the terminal and its constitution ratio are particularly important. is there. In the early-strength concrete composition of the present invention, the specific water-soluble vinyl copolymer having the structural unit D in a predetermined ratio is used as a cement dispersant in a predetermined amount with respect to the early-strength Portland cement.
The decrease in fluidity over time is reduced, and at the same time, the cured product obtained exhibits sufficient early strength, and crack resistance is enhanced.
【００１８】本発明はセメント分散剤として用いる水溶
性ビニル共重合体の合成方法を特に制限するものではな
く、その合成には公知の方法、例えば特開平６−２０６
７５０号公報に記載されているような方法が適用でき
る。例えば、ラジカル開始剤の存在下に、各構成単位を
形成することとなる前記した各ビニル単量体を所定の共
重合比率となるよう水系溶液にてラジカル共重合するこ
とにより得られる。かくして得られる水溶性ビニル共重
合体の数平均分子量は２０００〜２００００（ＧＰＣ
法、プルラン換算）の範囲のものとするが、３０００〜
１５０００の範囲のものとするのが好ましい。The present invention does not particularly limit the method for synthesizing the water-soluble vinyl copolymer used as the cement dispersant, and a known method for the synthesis thereof, for example, JP-A-6-206.
The method described in Japanese Patent Publication No. 750 can be applied. For example, it can be obtained by radically copolymerizing each of the above-mentioned vinyl monomers that will form each structural unit in an aqueous solution in the presence of a radical initiator so as to have a predetermined copolymerization ratio. The number average molecular weight of the water-soluble vinyl copolymer thus obtained is 2000 to 20000 (GPC
Law, pullulan conversion)
It is preferably in the range of 15,000.
【００１９】本発明において、セメント分散剤である水
溶性ビニル共重合体の使用量は、早強ポルトランドセメ
ント１００重量部に対して、固形分換算で、０．１〜
２．０重量部とするが、０．５〜１．５重量部とするの
が好ましい。水溶性ビニル共重合体はコンクリート組成
物の練り混ぜ時に練り混ぜ水と一緒に添加することがで
きる。In the present invention, the amount of the water-soluble vinyl copolymer used as the cement dispersant is 0.1 to 100 parts by weight of early-strength Portland cement in terms of solid content.
The amount is 2.0 parts by weight, preferably 0.5 to 1.5 parts by weight. The water-soluble vinyl copolymer can be added together with mixing water when mixing the concrete composition.
【００２０】本発明の早強コンクリート組成物は、以上
説明したような早強ポルトランドセメント、水、細骨
材、粗骨材及びセメント分散剤を必須成分とするが、合
目的的に他の剤を併用することもできる。かかる他の剤
としては、空気連行剤、消泡剤、凝結促進剤、凝結遅延
剤、防錆剤、防腐剤、防水剤等がある。The early-strength concrete composition of the present invention contains the above-described early-strength Portland cement, water, fine aggregate, coarse aggregate and cement dispersant as essential components, but other agents may be used purposefully. Can also be used together. Such other agents include air entraining agents, antifoaming agents, setting accelerators, setting retarders, rust preventives, preservatives, waterproofing agents and the like.
【００２１】以下、本発明の構成及び硬化をより一層具
体的にするため、実施例等を挙げるが、本発明が該実施
例に限定されるというものではない。尚、以下の実施例
等において、部は重量部を、また％を空気量を除き重量
％を意味する。Examples will be given below to make the constitution and curing of the present invention more concrete, but the present invention is not limited to the examples. In the following Examples and the like, “part” means “part by weight” and “%” means “% by weight excluding the amount of air”.
【００２２】[0022]
試験区分１（セメント分散剤としての水溶性ビニル共重
合体の合成） ・水溶性ビニル共重合体Ｐ−１の合成 メタクリル酸１００部（１．１６モル）、メタリルスル
ホン酸ナトリウム４０部（０．２５モル）、メチルアク
リレート２５部（０．２９モル）、フェノキシポリエト
キシエチル（オキシエチレン単位の繰り返し数が１５、
以下ｎ＝１５という）メタクリレート４００部（０．４
９モル）及び水７５０部を反応容器に仕込み、水酸化ナ
トリウムの３０％水溶液１５５部を投入して中和し、均
一に溶解した後、雰囲気を窒素置換した。反応系の温度
を温水浴にて６０℃に保ち、過硫酸アンモニウムの１５
％水溶液７５部を投入して重合を開始し、６時間重合反
応を継続して重合を完結した。その後、酸性分解物の中
和のために３０％水酸化ナトリウム水溶液５部を投入し
て中和し、生成物を得た。得られた生成物の一部をエバ
ポレータで濃縮し、アセトン／イソプロパノールの混合
溶媒中で沈殿精製して乾燥し、水溶性ビニル共重合体Ｐ
−１を得た。水溶性ビニル共重合体Ｐ−１をＵＶ吸収、
ＮＭＲ測定、熱分解ガスクロマトグラフィー、元素分
析、滴定等で分析したところ、カルボキシル価１１０、
イオウ含有量１．２％であり、構成単位Ａ〜Ｄに相当す
る各ビニル単量体の共重合比率は、メタクリル酸ナトリ
ウム／メタリルスルホン酸ナトリウム／メチルアクリレ
ート／フェノキシポリエトキシエチル（ｎ＝１５）メタ
クリレート＝５１／１０／１３／２６（モル比）で、数
平均分子量４８００（ＧＰＣ法、プルラン換算、以下同
じ）であった。Test Category 1 (Synthesis of Water-Soluble Vinyl Copolymer as Cement Dispersant) -Synthesis of Water-Soluble Vinyl Copolymer P-1 Methacrylic acid 100 parts (1.16 mol), Sodium methallyl sulfonate 40 parts (0 0.25 mol), 25 parts of methyl acrylate (0.29 mol), phenoxypolyethoxyethyl (the number of repeating oxyethylene units is 15,
400 parts of methacrylate (hereinafter referred to as n = 15) (0.4
(9 mol) and 750 parts of water were charged into a reaction vessel, and 155 parts of a 30% aqueous solution of sodium hydroxide was added to neutralize and uniformly dissolve, and then the atmosphere was replaced with nitrogen. Keep the temperature of the reaction system at 60 ° C in a warm water bath, and add 15% of ammonium persulfate.
% 75% aqueous solution was added to start the polymerization, and the polymerization reaction was continued for 6 hours to complete the polymerization. Thereafter, 5 parts of a 30% aqueous sodium hydroxide solution was added to neutralize the acidic decomposed product, and the product was obtained. A part of the obtained product was concentrated by an evaporator, precipitated and purified in a mixed solvent of acetone / isopropanol, and dried to obtain a water-soluble vinyl copolymer P.
-1 was obtained. UV absorption of the water-soluble vinyl copolymer P-1
When analyzed by NMR measurement, thermal decomposition gas chromatography, elemental analysis, titration, etc., a carboxyl value of 110,
The sulfur content is 1.2%, and the copolymerization ratio of each vinyl monomer corresponding to the structural units A to D is sodium methacrylate / sodium methallyl sulfonate / methyl acrylate / phenoxypolyethoxyethyl (n = 15). ) Methacrylate = 51/10/13/26 (molar ratio), and the number average molecular weight was 4,800 (GPC method, pullulan conversion, the same applies hereinafter).
【００２３】・水溶性ビニル共重合体Ｐ−２〜Ｐ−５及
びＲ−１〜Ｒ−１３の合成 水溶性ビニル共重合体Ｐ−１と同様にして、表１記載の
水溶性ビニル共重合体Ｐ−２〜Ｐ−５及びＲ−１〜Ｒ−
１３を得た。Synthesis of water-soluble vinyl copolymers P-2 to P-5 and R-1 to R-13 In the same manner as the water-soluble vinyl copolymer P-1, the water-soluble vinyl copolymers shown in Table 1 are added. Combined P-2 to P-5 and R-1 to R-
13 was obtained.
【００２４】[0024]
【表１】 [Table 1]
【００２５】表１において、 Ａ−１：メタクリル酸ナトリウム Ａ−２：アクリル酸ナトリウム Ｂ−１：メタリルスルホン酸ナトリウム Ｃ−１：メチルアクリレート Ｄ−１：フェノキシポリエトキシエチル（ｎ＝１５）メ
タクリレート Ｄ−２：フェノキシポリエトキシエチル（ｎ＝２５）メ
タクリレート Ｄ−３：フェノキシポリエトキシエチル（ｎ＝４０）メ
タクリレート Ｅ−１：メトキシポリエトキシエチル（ｎ＝１０）メタ
クリレート Ｅ−２：ポリエチレングリコール（ｎ＝１０）モノメタ
クリレートIn Table 1, A-1: sodium methacrylate A-2: sodium acrylate B-1: sodium methallyl sulfonate C-1: methyl acrylate D-1: phenoxypolyethoxyethyl (n = 15) methacrylate D-2: Phenoxypolyethoxyethyl (n = 25) methacrylate D-3: Phenoxypolyethoxyethyl (n = 40) methacrylate E-1: Methoxypolyethoxyethyl (n = 10) methacrylate E-2: Polyethylene glycol (n = 10) Monomethacrylate
【００２６】試験区分２（早強コンクリート組成物の調
製及びその評価） ・早強コンクリート組成物の調製 表３に示す各例の早強コンクリート組成物を次のように
調製した。先ず表２に示す調合条件で、２０℃×８０％
ＲＨの調湿下、５０リットルのパン型強制ミキサーに早
強ポルトランドセメント、細骨材及び粗骨材を順次投入
して１５秒間空練りをした。次いで、各例いずれも目標
スランプが１８±１cmの範囲に入るように、セメント分
散剤を練り混ぜ水と共に添加して２分間練り混ぜた。ま
た、空気量の調整は、各例いずれも目標空気量が４±１
％となるように空気量調整剤（竹本油脂社製の空気量調
整剤ＡＥ３００）を添加して行なった。Test Category 2 (Preparation of Early-Strength Concrete Composition and Evaluation thereof) Preparation of Early-Strength Concrete Composition The early-strength concrete compositions of each example shown in Table 3 were prepared as follows. First, under the mixing conditions shown in Table 2, 20 ° C x 80%
While controlling the humidity of RH, early-strength Portland cement, fine aggregate and coarse aggregate were sequentially added to a 50-liter pan-type forced mixer and kneaded for 15 seconds. Then, in each of the examples, a cement dispersant was added together with mixing water so that the target slump was in the range of 18 ± 1 cm, and the mixture was mixed for 2 minutes. In addition, the target air amount is adjusted to 4 ± 1 in each example.
The air amount adjusting agent (air amount adjusting agent AE300 manufactured by Takemoto Yushi Co., Ltd.) was added so that the amount of the chemical composition became 100%.
【００２７】[0027]
【表２】 [Table 2]
【００２８】表２において、 早強ポルトランドセメント：秩父小野田社製の早強ポル
トランドセメント（比重３．１３） 細骨材：日比産海砂（比重２．５４）／男鹿島砕砂（比
重２．６５）＝７０／３０（容積比）の混合物 粗骨材：岡崎産砕石（比重２．６６）In Table 2, early strength Portland cement: early strength Portland cement manufactured by Chichibu Onoda Co. (specific gravity 3.13) Fine aggregate: Hibi sea sand (specific gravity 2.54) / Ogajima crushed sand (specific gravity 2.13) 65) = 70/30 (volume ratio) mixture Coarse aggregate: Okazaki crushed stone (specific gravity 2.66)
【００２９】・調製した早強コンクリート組成物の評価 調製した各例の早強コンクリート組成物について、次の
ように評価した。結果を表３に示した。 スランプ：練り混ぜ直後、更に６０分静置後及び９０分
静置後に、ＪＩＳ−Ａ１１０１に準拠して測定した スランプ残存率：（９０分後のスランプ／直後のスラン
プ）×１００ 空気量：ＪＩＳ−Ａ１１２８に準拠して測定したEvaluation of the prepared early-strength concrete compositions The prepared early-strength concrete compositions of each example were evaluated as follows. The results are shown in Table 3. Slump: Immediately after kneading, after further standing for 60 minutes and after standing for 90 minutes, slump residual rate measured according to JIS-A1101: (slump after 90 minutes / slump immediately after) × 100 Air volume: JIS- Measured according to A1128
【００３０】[0030]
【表３】 [Table 3]
【００３１】表３において、 ＊１：直後のスランプ値が目標スランプ値にならなかっ
たので測定しなかった ＊２：９０分後のスランプ値がないため計算値なし 添加量：早強ポルトランドセメント１００重量部に対す
る固形分換算値In Table 3, * 1: Not measured because the slump value immediately after did not reach the target slump value. * 2: No calculated value because there is no slump value after 90 minutes Addition amount: Early strength Portland cement 100 Solid content conversion value to parts by weight
【００３２】試験区分３（硬化物の作製及びその評価） ・硬化物の作製 １）圧縮強度測定用硬化物の作製 試験区分２で調製した各例の早強コンクリート組成物を
直径１０cm×高さ２０cmの鋼製円筒型枠へ打設した。２
０℃で１日気中養生したものを材齢１日の供試体とし、
また２０℃で３日又は２８日水中養生したものをそれぞ
れ材齢３日の供試体、材齢２８日の供試体とした。 ２）乾燥収縮測定用硬化物の作製 試験区分２で調製した各例の早強コンクリート組成物
を、ＪＩＳ−Ａ１１３２に準じて、寸法１０cm×１０cm
×４０cmの鋼製直方型枠へ打設し、硬化したものを供試
体とした。 ３）ひび割れ発生日測定用硬化物の作製 試験区分２で調製した各例の早強コンクリート組成物を
用い、ＪＩＳ原案（セメントコンクリート、５３〜５５
頁、５３２号、１９９１年）の方法による鋼製型枠へ打
設し、そのまま２０℃×６０％ＲＨで保存したものを供
試体とした。Test Category 3 (Preparation of Cured Product and Evaluation thereof) Preparation of Cured Product 1) Preparation of Cured Product for Compressive Strength Measurement The early-strength concrete composition of each example prepared in Test Section 2 had a diameter of 10 cm and a height of 10 cm. It was cast into a 20 cm steel cylindrical formwork. Two
A specimen that was aged at 0 ° C for 1 day in air was used as a specimen for 1 day of age.
Further, those aged in water at 20 ° C. for 3 days or 28 days were used as a specimen of 3 days old and a specimen of 28 days old, respectively. 2) Preparation of cured product for dry shrinkage measurement The high-strength concrete composition of each example prepared in Test Category 2 was measured in accordance with JIS-A1132 to have dimensions of 10 cm x 10 cm.
It was cast into a steel rectangular mold of 40 cm and hardened to obtain a specimen. 3) Preparation of a cured product for measuring the date of occurrence of cracking Using the early-strength concrete composition of each example prepared in Test Category 2, JIS draft (cement concrete, 53-55)
P. 532, 1991) was placed in a steel mold and stored as it was at 20 ° C. × 60% RH to give a test piece.
【００３３】・作製した硬化物の評価 前記１）〜３）で得られた各供試体について、次のよう
に評価した。結果を表４に示した。 圧縮強度：ＪＩＳ−Ａ１１０８に準拠して測定した 乾燥収縮率：ＪＩＳ−Ａ１１２９に準拠し、コンパレー
タ方法により測定したひび割れ発生日：ＪＩＳ原案（セ
メントコンクリート、５３〜５５頁、５３２号、１９９
１年）の方法に準拠して測定した（この試験方法は、拘
束によりひび割れが必ず入るようになっており、ひび割
れ発生日の遅い方がひび割れ抵抗性の高いことを示す）Evaluation of Cured Product Produced Each of the test pieces obtained in 1) to 3) above was evaluated as follows. The results are shown in Table 4. Compressive strength: Measured according to JIS-A1108 Drying shrinkage ratio: According to JIS-A1129, crack generation date measured by comparator method: JIS original draft (cement concrete, pages 53 to 55, No. 532, 199)
1 year) (measured in accordance with the method of 1 year) (this test method shows that cracks always occur due to restraint, and that the later the cracking date is, the higher the crack resistance is)
【００３４】[0034]
【表４】 [Table 4]
【００３５】表４において、 ＊３：目標スランプ値に達しなかったので測定しなかっ
た ＊４：供試体を作製できなかったので測定しなかったIn Table 4, * 3: No measurement was performed because the target slump value was not reached. * 4: No measurement was performed because a specimen could not be prepared.
【００３６】[0036]
【発明の効果】既に明らかなように、以上説明した本発
明には、従来の早強コンクリート組成物に比較して、調
製した早強コンクリート組成物の流動性の経時的低下が
小さく、同時に得られる硬化物に充分な早期強度を発現
させ、またひび割れ抵抗性を高めることができるという
効果がある。As is apparent from the above, the present invention described above has a small decrease in fluidity of the prepared early-strength concrete composition over time as compared with the conventional early-strength concrete composition, and can be obtained at the same time. There is an effect that a cured product to be obtained can exhibit sufficient early strength and crack resistance can be enhanced.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 24:26） 103:40 111:20 (72)発明者 伊井 敬二 兵庫県神戸市北区松が枝町１−１−43− 905 (72)発明者 牧 保峯 愛知県幡豆郡吉良町大字吉田字大切間30 (72)発明者 青山 晴洋 愛知県豊橋市北島町北島238 (72)発明者 小川 盈弥 奈良県奈良市百楽園１丁目８−28 フォル ム学園前201号室 (72)発明者 木之下 光男 愛知県豊川市為当町椎木308番地─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Internal reference number FI technical display location C04B 24:26) 103: 40 111: 20 (72) Inventor Keiji Ii Matsugae Kita-ku, Kobe City, Hyogo Prefecture Town 1-143- 905 (72) Inventor Maki Hoho Akira 30 Yoshira, Yoshira, Hira-gun, Hachi-gun, Aichi Yama Haruyo Aoyama 238 Kitajima, Kitajima-cho, Toyohashi-shi, Aichi (72) Inventor Ogawa Ya 8-chome, Hyakurakuen, Nara, Nara Prefecture, Room 8-28, Formakuen-mae, Room 201 (72) Inventor Mitsuo Kinoshita 308 Shiiki, Tomegawa-cho, Toyokawa-shi, Aichi
Claims (2)
トを用い、更に水、細骨材、粗骨材及びセメント分散剤
を用いて調製した早強コンクリート組成物において、水
／セメント比が３０〜６５％、単位水量が１４０〜１８
５kg／ｍ3、細骨材の単位量が７００〜１２００kg／ｍ3
及び粗骨材の単位量が８００〜１２００kg／ｍ3であ
り、且つ早強ポルトランドセメント１００重量部に対し
て下記のセメント分散剤を０．１〜２．０重量部の割合
で用いて成ることを特徴とする早強コンクリート組成
物。 セメント分散剤：下記の式１で示される構成単位Ａ、下
記の式２で示される構成単位Ｂ、下記の式３で示される
構成単位Ｃ及び下記の式４で示される構成単位Ｄで構成
された水溶性ビニル共重合体であって、全構成単位中、
構成単位Ａが４５〜６５モル％、構成単位Ｂが２〜１５
モル％、構成単位Ｃが５〜２０モル％及び構成単位Ｄが
１０〜４０モル％を占め、且つ数平均分子量が２０００
〜２００００である水溶性ビニル共重合体。 【式１】 【式２】 【式３】 【式４】 （式１〜式４において、 Ｒ1，Ｒ2：Ｈ又はＣＨ3 Ｒ3：フェニル基 Ｍ1，Ｍ2：アルカリ金属、アルカリ土類金属及び有機ア
ミンから選ばれるカチオン基 ｍ：５〜４５の整数）1. A fast-strength concrete composition prepared by using early-strength Portland cement as cement, and further using water, fine aggregate, coarse aggregate and cement dispersant, wherein the water / cement ratio is 30 to 65%, Unit water amount is 140-18
5 kg / m 3 , unit amount of fine aggregate is 700 to 1200 kg / m 3
And the unit amount of coarse aggregate is 800 to 1200 kg / m 3 , and the following cement dispersant is used in a ratio of 0.1 to 2.0 parts by weight with respect to 100 parts by weight of early strength Portland cement. A high-strength concrete composition characterized by: Cement dispersant: Consists of a structural unit A represented by the following formula 1, a structural unit B represented by the following formula 2, a structural unit C represented by the following formula 3, and a structural unit D represented by the following formula 4. A water-soluble vinyl copolymer, in all the structural units,
Structural unit A is 45 to 65 mol%, structural unit B is 2 to 15
Mol%, constituent unit C accounts for 5 to 20 mol% and constituent unit D accounts for 10 to 40 mol%, and the number average molecular weight is 2000.
A water-soluble vinyl copolymer having a molecular weight of 20,000. (Equation 1) (Equation 2) (Equation 3) (Equation 4) (In the formulas 1 to 4, R 1 , R 2 : H or CH 3 R 3 : phenyl group M 1 , M 2 : a cation group selected from alkali metal, alkaline earth metal and organic amine m: 5 to 45 integer)
単位Ａが５０〜６５モル％、構成単位Ｂが３〜１５モル
％、構成単位Ｃが７〜２０モル％及び構成単位Ｄが１５
〜３５モル％を占める水溶性ビニル共重合体である請求
項１記載の早強コンクリート組成物。2. The cement dispersant has a structural unit A of 50 to 65 mol%, a structural unit B of 3 to 15 mol%, a structural unit C of 7 to 20 mol% and a structural unit D of 15 in all the structural units.
The high-strength concrete composition according to claim 1, which is a water-soluble vinyl copolymer accounting for ˜35 mol%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17933295A JP3162605B2 (en) | 1995-06-21 | 1995-06-21 | Early strength concrete composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17933295A JP3162605B2 (en) | 1995-06-21 | 1995-06-21 | Early strength concrete composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH092855A true JPH092855A (en) | 1997-01-07 |
| JP3162605B2 JP3162605B2 (en) | 2001-05-08 |
Family
ID=16063993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17933295A Expired - Fee Related JP3162605B2 (en) | 1995-06-21 | 1995-06-21 | Early strength concrete composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3162605B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103073215A (en) * | 2013-01-08 | 2013-05-01 | 武汉格瑞林建材科技股份有限公司 | Polycarboxylate superplasticizer with narrow molecular weight distribution and preparation method thereof |
| CN105399382A (en) * | 2015-12-10 | 2016-03-16 | 中交一公局桥隧工程有限公司 | High-early-strength micro-expansion concrete |
| CN112225502A (en) * | 2020-09-25 | 2021-01-15 | 青岛青泰建筑科技有限公司 | Super early strength water reducing concrete and preparation method thereof |
-
1995
- 1995-06-21 JP JP17933295A patent/JP3162605B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103073215A (en) * | 2013-01-08 | 2013-05-01 | 武汉格瑞林建材科技股份有限公司 | Polycarboxylate superplasticizer with narrow molecular weight distribution and preparation method thereof |
| CN103073215B (en) * | 2013-01-08 | 2015-08-12 | 武汉格瑞林建材科技股份有限公司 | Polycarboxylate water-reducer of a kind of narrow molecular weight distributions and preparation method thereof |
| CN105399382A (en) * | 2015-12-10 | 2016-03-16 | 中交一公局桥隧工程有限公司 | High-early-strength micro-expansion concrete |
| CN112225502A (en) * | 2020-09-25 | 2021-01-15 | 青岛青泰建筑科技有限公司 | Super early strength water reducing concrete and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3162605B2 (en) | 2001-05-08 |
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