JPH107446A - Cement additive and use of the same - Google Patents

Cement additive and use of the same

Info

Publication number
JPH107446A
JPH107446A JP18415796A JP18415796A JPH107446A JP H107446 A JPH107446 A JP H107446A JP 18415796 A JP18415796 A JP 18415796A JP 18415796 A JP18415796 A JP 18415796A JP H107446 A JPH107446 A JP H107446A
Authority
JP
Japan
Prior art keywords
cement
acid
reducing agent
copolymer
weight
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.)
Pending
Application number
JP18415796A
Other languages
Japanese (ja)
Inventor
Shuzo Nakamura
秀三 中村
Shoichi Ogawa
彰一 小川
Masaru Kaneko
勝 金子
Hirotake Yamashita
裕毅 山下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chichibu Onoda Cement Corp
Original Assignee
Chichibu Onoda Cement Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chichibu Onoda Cement Corp filed Critical Chichibu Onoda Cement Corp
Priority to JP18415796A priority Critical patent/JPH107446A/en
Publication of JPH107446A publication Critical patent/JPH107446A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C04B2103/20Retarders
    • 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

Abstract

PROBLEM TO BE SOLVED: To obtain a cement additive capable of maintaining a flowing property without increasing a unit amount of water even at a high temperature in a cement composition, decreasing a slump loss and suppressing a generation of a cold joint. SOLUTION: This cement additive is obtained by combining a water-reducing agent consisting of at least one kind of a copolymer consisting of a polyoxyalkylene compound expressed by the formula: CH2 =CH-CH2 O-(AO)n R [AO is a 2-4C oxyalkylene group, of which 50-100mol% is oxyethylene group; R is a 1-4C alkyl group; (n) is 10-20] and maleic anhydride as indispensable components, a hydrolysate of the copolymer, and salts of the hydrolysate as an active ingredient, with a retarding agent consisting of at least one kind of an oxycarboxylic acid, a phosphonic acid and their derivatives as an active ingredient.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、セメント添加剤及
びこのセメント添加剤の使用方法に係り、詳しくは、セ
メントペースト、モルタル、コンクリートなどのセメン
ト組成物に配合し、特にセメント組成物の温度がたとえ
ば25℃以上と高温になる場合にも、単位水量を増加さ
せることなく流動性を確保し、スランプロスを少なく
し、コールドジョイントの発生を抑制して施工性を大幅
に改善するセメント添加剤及びこのセメント添加剤の使
用方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement additive and a method for using the cement additive. More specifically, the present invention relates to a cement additive such as cement paste, mortar, concrete, and the like. For example, even when the temperature is as high as 25 ° C. or more, a cement additive that ensures fluidity without increasing the unit water amount, reduces slump loss, suppresses the occurrence of cold joints, and significantly improves workability. It relates to the method of using the cement additive.

【0002】[0002]

【従来の技術】セメントペースト、モルタル、コンクリ
ートなどのセメント組成物に配合する減水剤として、リ
グニンスルホン酸、メラミンスルホン酸やナフタレンス
ルホン酸などが知られており、セメントの分散性を増
し、流動性を改善して施工性を向上させるために使用さ
れている。しかしながら、これらの減水剤では、少なか
らず時間とともにスランプが低下して(スランプロス)流
動性が損なわれる。このスランプロスを改善する方法と
して、減水剤として、アクリル系水溶性ビニル共重合物
や無水マレイン酸共重合物を用いることも行われてい
る。
2. Description of the Related Art Lignin sulfonic acid, melamine sulfonic acid, naphthalene sulfonic acid and the like are known as water reducing agents to be added to cement compositions such as cement paste, mortar, concrete and the like. Is used to improve the workability. However, with these water reducing agents, the slump decreases over time (slump loss) and the fluidity is impaired. As a method of improving the slump loss, an acrylic water-soluble vinyl copolymer or a maleic anhydride copolymer is used as a water reducing agent.

【0003】しかしながら、これらの減水剤において
も、スランプロスがあり、また特に環境温度が高い夏場
において、セメント組成物の温度がたとえば25℃以上
となる場合には、減水剤のもつセメント分散作用が低下
して所定の流動性が得られなかったり、スランプロスが
大きくなって施工性を損なったり、さらに、このスラン
プロスとセメントの凝結が速まることが原因となって、
コンクリート打ち込み継続中に不連続面が生じ、構造上
の欠陥となるコールドジョイントが発生したり、あるい
は打設表面の仕上性が劣るなどの問題があった。
[0003] However, these water reducing agents also have a slump loss and, particularly in summer when the environmental temperature is high, when the temperature of the cement composition becomes, for example, 25 ° C or more, the cement dispersing action of the water reducing agent is exerted. It is not possible to obtain the predetermined fluidity due to the decrease, or the slump loss increases and the workability is impaired, and further, due to the rapid setting of the slump loss and the cement,
There have been problems such as a discontinuous surface being generated while the concrete is being poured and a cold joint, which is a structural defect, or a poor surface finish of the casting surface.

【0004】この問題に対しては、セメント組成物の温
度を低下させるために、使用する水や骨材を冷やした
り、あるいは液体窒素をセメント組成物に吹き込む方法
もあるが、冷却のための設備を必要とし、多大な費用が
掛かるものであった。さらにセメント組成物の温度が高
い場合には、所定の流動性を得るのにより多くの減水剤
を必要としたり、あるいは所定の流動性を得るためにセ
メント組成物中の水の量(単位水量)を多くする必要が生
じ、結果としてセメント組成物硬化体の強度を低下させ
てしまうといった問題がある。
[0004] In order to reduce the temperature of the cement composition, there are methods of cooling water or aggregate used or blowing liquid nitrogen into the cement composition. And required a great deal of expense. Furthermore, when the temperature of the cement composition is high, more water reducing agent is required to obtain the predetermined fluidity, or the amount of water in the cement composition to obtain the predetermined fluidity (unit water amount) Is required to be increased, and as a result, there is a problem that the strength of the cured cement composition is reduced.

【0005】[0005]

【本発明が解決しようとする課題】本発明は、これらの
問題を解決し、流動性がよく、スランプロスが小さく施
工性が良好で、特に環境温度が高い場合にもコールドジ
ョイントの発生が少ないセメント添加剤とその使用方法
を提供することにある。
SUMMARY OF THE INVENTION The present invention solves these problems and has good fluidity, small slump loss, good workability, and low occurrence of cold joints, especially when the environmental temperature is high. It is to provide a cement additive and a method of using the same.

【0006】[0006]

【課題を解決するための手段】本発明は、水硬性のセメ
ントを含有するセメントペースト、モルタル、コンクリ
ートなどのセメント組成物中に、特定のポリオキシアル
キレン化合物及び無水マレイン酸を必須成分とする共重
合物等を有効成分とする減水剤と、オキシカルボン酸、
ホスホン酸及びその誘導体の1種以上を有効成分とする
遅延剤とをセメント添加剤として配合することによって
達成される。
The present invention relates to a cement composition containing a specific polyoxyalkylene compound and maleic anhydride in a cement composition such as cement paste, mortar and concrete containing hydraulic cement. Water reducing agent containing a polymer or the like as an active ingredient, oxycarboxylic acid,
This is achieved by blending a retarder containing at least one of phosphonic acid and derivatives thereof as an active ingredient as a cement additive.

【0007】[0007]

【発明の実施の形態】以下、本発明を詳しく説明する。
本発明の構成成分である減水剤は、一般式(1)CH2=
CH-CH2O-(AO)nR (ただし、AOは炭素数2〜
4のオキシアルキレン基で、その50〜100モル%は
オキシエチレン基であり、Rは炭素数1〜4のアルキル
基、nは10〜200) で示されるポリオキシアルキ
レン化合物及び無水マレイン酸を必須成分とする共重合
物、この共重合物の加水分解物及びこの共重合物の加水
分解物の塩のうちの1種以上を有効成分とする減水剤で
ある。このポリオキシアルキレン化合物と無水マレイン
酸の共重合物は、例えば特開昭63−285140号公
報や特開平5−310458号公報に示されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The water reducing agent, which is a component of the present invention, has the general formula (1) CH 2 =
CH—CH 2 O— (AO) n R (where AO has 2 to 2 carbon atoms)
4 is an oxyalkylene group, of which 50 to 100 mol% is an oxyethylene group, R is an alkyl group having 1 to 4 carbon atoms, n is 10 to 200), and a polyoxyalkylene compound represented by the following formula: A water reducing agent comprising at least one of a copolymer as a component, a hydrolyzate of the copolymer, and a salt of a hydrolyzate of the copolymer as an active ingredient. The copolymer of the polyoxyalkylene compound and maleic anhydride is disclosed in, for example, JP-A-63-285140 and JP-A-5-310458.

【0008】この減水剤の使用量は、セメント100重
量部に対して、固形分として0.03〜1重量部の割合
である。この量が0.03重量部より少ないと、セメン
トに対する分散効果がなく流動性が得られず、また1重
量部を超えると、ブリージングが多くなり、沈みひびわ
れや初期乾燥ひびわれを生じたり、骨材分離を生じたり
し、また不経済である。
The amount of the water reducing agent used is 0.03 to 1 part by weight as a solid content with respect to 100 parts by weight of cement. If the amount is less than 0.03 parts by weight, there is no dispersing effect on the cement and no fluidity can be obtained. If the amount is more than 1 part by weight, bleeding increases, causing sink cracks, initial dry cracks, and aggregates. Separation occurs and is uneconomical.

【0009】本発明の構成成分である遅延剤は、オキシ
カルボン酸、ホスホン酸及びその誘導体のうちの1種以
上であり、オキシカルボン酸としては、グルコン酸、グ
ルコヘプトン酸、アラボン酸、リンゴ酸、酒石酸、クエ
ン酸及びこれらのアルカリ金属塩、アルカリ土類金属塩
を用いることができ、ホスホン酸及びその誘導体として
は、アミノトリ(メチレンホスホン酸)、1-ヒドロキシエ
チリデン-1,1-ジホスホン酸、エチレンジアミンテトラ
(メチレンホスホン酸)、ジエチレントリアミンペンタ
(メチレンホスホン酸)及びこれらのアルカリ金属塩、ア
ルカリ土類金属塩を用いることができる。
The retarder which is a component of the present invention is at least one of oxycarboxylic acid, phosphonic acid and derivatives thereof, and the oxycarboxylic acid includes gluconic acid, glucoheptonic acid, arabonic acid, malic acid, Tartaric acid, citric acid and their alkali metal salts, alkaline earth metal salts can be used, and as phosphonic acid and its derivatives, aminotri (methylene phosphonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, ethylenediamine Tetra
(Methylene phosphonic acid), diethylene triamine penta
(Methylene phosphonic acid) and their alkali metal salts and alkaline earth metal salts.

【0010】なかでも、グルコン酸、アミノトリ(メチ
レンホスホン酸)、1-ヒドロキシエチリデン-1,1-ジホス
ホン酸は、少量添加でスランプロスの改善効果が大き
い。これら遅延剤は単独で添加しても、あるいは2種以
上を混合して用いてもよい。この遅延剤の添加量は、セ
メント100重量部に対して固形分で0.01〜1重量
部がよい。0.01重量部より少ないと、特にセメント
組成物の温度が25℃以上となる場合には、スランプロ
スの防止効果がなく、また1重量部を超えると、水硬性
セメントが硬化不良を起こし、また所定の強度が得られ
なかったりする。
Among them, gluconic acid, aminotri (methylenephosphonic acid), and 1-hydroxyethylidene-1,1-diphosphonic acid have a large effect of improving slump loss by adding a small amount. These retarders may be added alone or as a mixture of two or more. The amount of the retarder to be added is preferably from 0.01 to 1 part by weight as a solid content with respect to 100 parts by weight of cement. When the amount is less than 0.01 part by weight, especially when the temperature of the cement composition is 25 ° C. or higher, there is no slump loss preventing effect, and when it exceeds 1 part by weight, the hydraulic cement causes poor curing, Also, a predetermined strength may not be obtained.

【0011】本発明のセメント添加剤は、水硬性のセメ
ント及び水とを主体としたセメントペースト、これに細
骨材たとえば砂を加えたモルタル、さらにこれに粗骨材
たとえば砕石や軽量骨材を加えたコンクリート等のセメ
ント組成物に添加する。水硬性のセメントとしては、普
通、早強、中庸熱、耐硫酸塩などの各種のポルトランド
セメントやC2Sを多く含有するビーライトセメント、
これらのセメントに鉱物質微粉末である高炉水砕スラ
グ、フライアッシュ、シリカヒューム、石灰石微粉末、
シリカ、火山灰、珪藻土などを添加した混合セメント、
アルミネート鉱物を添加した速硬性セメント等である。
The cement additive of the present invention includes a cement paste mainly composed of hydraulic cement and water, a mortar obtained by adding fine aggregate such as sand, and a coarse aggregate such as crushed stone or lightweight aggregate. It is added to the added cement or other cement composition. Examples of hydraulic cements include ordinary, high-strength, moderate heat, various portland cements such as sulfate-resistant, belite cement containing a large amount of C 2 S,
Blast furnace granulated slag, fly ash, silica fume, limestone fine powder,
Mixed cement with silica, volcanic ash, diatomaceous earth, etc.
It is a fast-setting cement to which an aluminate mineral is added.

【0012】またセメント組成物には、その他成分、例
えば、AE剤、消泡剤、流動化剤、増粘剤、乾燥収縮低
減剤、防錆剤、発泡材、膨張材などの混和材料、高炉ス
ラグ骨材、鉄鉱石などの骨材、スチールファイバーや連
続繊維などの補強剤を配合してもよい。本発明のセメン
ト添加剤のセメント組成物への添加順序は、特に制限さ
れず、例えば、減水剤と遅延剤とを、水硬性セメントに
プレミックスしてもよく、あるいは、減水剤をセメン
ト、水、細骨材、粗骨材等とともに練り混ぜた後に、遅
延剤を添加してもよい。さらにセメント組成物中への本
発明の添加剤の添加方法、セメント組成物各材料の練り
混ぜ方法は特に制限を受けるものではない。
The cement composition may contain other components such as an AE agent, an antifoaming agent, a fluidizing agent, a thickening agent, a drying shrinkage reducing agent, a rust preventive, a foaming material, an admixing material such as an expanding material, a blast furnace. Aggregates such as slag aggregate and iron ore, and reinforcing agents such as steel fiber and continuous fiber may be blended. The order of addition of the cement additive of the present invention to the cement composition is not particularly limited.For example, a water reducing agent and a retarder may be premixed with a hydraulic cement, or a water reducing agent may be mixed with cement and water. After kneading with fine aggregate, coarse aggregate and the like, a retarder may be added. Further, the method of adding the additive of the present invention to the cement composition and the method of kneading each material of the cement composition are not particularly limited.

【0013】[0013]

【実施例】実施例1 普通ポルトランドセメント100重量部、水38重量
部、小笠産砂200重量部、岩瀬産砕石337重量部に
対して、表1に示すように、減水剤として、末端がメチ
ル基(R;CH3)で、n=34のオキシエチレン基を構
造中にもつポリオキシアルキレン化合物…CH2=CH-
CH2O-(CH2CH2O-)34CH3と無水マレイン酸との
共重合物A、リグニンスルホン酸塩B、アクリル酸系の
共重合物C及びDを、遅延剤として表−1に示すものを
用い、添加量を変えて、スランプ及び強度を測定した。
各材料は予め30℃とし、30℃恒温室で1分間強制パ
ン型ミキサーで練り混ぜてセメント組成物とし、練り混
ぜ直後及び練り混ぜから30分後にスランプ試験を実施
した。また練り上がったセメント組成物を直径10cm×
長さ20cmの円筒形型枠に詰め、24時間後に脱型して
圧縮強度を測定した。
Example 1 As shown in Table 1, a 100% by weight of ordinary Portland cement, 38 parts by weight of water, 200 parts by weight of sand from Ogasa and 337 parts by weight of crushed stone from Iwase were used as a water reducing agent, and the terminal was methyl. Group (R; CH 3 ), a polyoxyalkylene compound having an oxyethylene group with n = 34 in the structure: CH 2 CHCH—
A copolymer A of CH 2 O— (CH 2 CH 2 O—) 34 CH 3 and maleic anhydride, a lignin sulfonate B, and an acrylic acid-based copolymer C and D were used as retarders in Table 1 The slump and the strength were measured by changing the amount of addition using the materials shown in (1) and (2).
Each material was previously set to 30 ° C. and kneaded in a 30 ° C. constant temperature room for 1 minute with a forced pan mixer to form a cement composition, and a slump test was performed immediately after kneading and 30 minutes after kneading. In addition, the kneaded cement composition is 10 cm in diameter.
It was packed in a cylindrical form having a length of 20 cm, demolded after 24 hours, and the compressive strength was measured.

【0014】[0014]

【表1】 [Table 1]

【0015】その結果、実験No.1から実験No.5に示し
た本発明のセメント添加剤を適正量用いたものは、スラ
ンプ保持に優れ、また24時間後の圧縮強度は何れも1
80kgf/cm2で良好であった。これに対し、減水剤添加
量が0.02重量部と少ない実験No.6では、スランプ
が0cmで流動性がなく、また、減水剤添加量が1.2重
量部と多い実験No.7では、スランプは19.5cmとな
ったが、セメントペースト部分が粗骨材と分離し、また
ブリージングが極端に多いものであった。また、グルコ
ン酸添加量が1.2重量部と多い実験No.8では、セメ
ントの硬化不良を生じ、24時間後の圧縮強度は極端に
低くなった。また、ポリオキシアルキレン化合物と無水
マレイン酸との共重合物以外の減水剤を用いた実験No.
9から実験No.11では、何れも実験No.2から実験No.
4の本発明の減水剤と同一添加量でも、練り直後のスラ
ンプ値は小さく、スランプロスも大きいものであった。
[0015] As a result, those using the proper amount of the cement additive of the present invention shown in Experiment Nos. 1 to 5 were excellent in slump retention, and each had a compressive strength of 1 hour after 24 hours.
It was good at 80 kgf / cm 2 . On the other hand, in Experiment No. 6 in which the amount of the water reducing agent added was as small as 0.02 parts by weight, the slump was 0 cm and there was no fluidity. The slump became 19.5 cm, but the cement paste part was separated from the coarse aggregate and the breathing was extremely large. In Experiment No. 8 in which the amount of gluconic acid added was as large as 1.2 parts by weight, poor setting of the cement occurred, and the compressive strength after 24 hours was extremely low. In addition, Experiment No. using a water reducing agent other than a copolymer of a polyoxyalkylene compound and maleic anhydride.
From Experiment No. 9 to Experiment No. 11, all are from Experiment No. 2 to Experiment No.
Even with the same addition amount as the water reducing agent of the present invention No. 4, the slump value immediately after kneading was small and the slump loss was large.

【0016】実施例2 普通ポルトランドセメント100重量部、水39重量
部、小笠産砂215重量部、岩瀬産砕石360重量部に
対して、表2に示すように、減水剤として、実施例1と
同じ末端がメチル基(R;CH3)で、n=34のオキシエ
チレン基を構造中にもつポリオキシアルキレン化合物…
CH2=CH-CH2O-(CH2CH2O-)34CH3と無水マ
レイン酸の共重合物A、ω-ヒドロキシポリオキシエチ
レンアクリレートとメチルアクリレートとの水溶性ビニ
ル共重合物Bを、遅延剤として、アミノトリ(メチレン
ホスホン酸)、グルコン酸を用い、添加量を変えて、ス
ランプを測定した。各材料は予め36℃とし、36℃恒
温室で1分間強制パン型ミキサーで練り混ぜてセメント
組成物とし、練り混ぜ直後から経時的に36℃恒温室で
スランプ試験を実施した。
[0016] Example 2 ordinary portland cement 100 parts by weight, 39 parts by weight of water, Ogasa producing sand 215 parts by weight, relative to Iwase producing crushed stone 360 parts by weight, as shown in Table 2, as a water reducing agent, as in Example 1 A polyoxyalkylene compound having the same terminal as a methyl group (R; CH 3 ) and having an oxyethylene group with n = 34 in the structure.
CH 2 CHCH—CH 2 O— (CH 2 CH 2 O—) 34 CH 3 and maleic anhydride copolymer A, ω-hydroxypolyoxyethylene acrylate and methyl acrylate water-soluble vinyl copolymer B A slump was measured using aminotri (methylenephosphonic acid) and gluconic acid as retarders, while changing the amount of addition. Each material was previously set at 36 ° C., and kneaded with a forced pan mixer in a 36 ° C. constant temperature room for 1 minute to form a cement composition, and a slump test was performed in the 36 ° C. constant temperature room over time immediately after kneading.

【0017】[0017]

【表2】 [Table 2]

【0018】 実験No.12、実験No.13に示した本発明の
セメント添加剤を適正量用いたものは、練り混ぜから1
20分後でもスランプロスは僅かであるが、遅延剤無添
加の実験No.14では、練り混ぜから90分以後のスラン
プロスが大きく、また、減水剤Aの代わりに減水剤Bを
用いた実験No.15では、練り直後のスランプ値が小さ
く、スランプロスも大きいものであった。
Samples using the proper amount of the cement additive of the present invention shown in Experiment No. 12 and Experiment No. 13
Although the slump loss was slight even after 20 minutes, in Experiment No. 14 in which no retarder was added, the slump loss after 90 minutes from the kneading was large, and the experiment using water reducing agent B instead of water reducing agent A was performed. In No. 15, the slump value immediately after kneading was small, and the slump loss was large.

【0019】[0019]

【発明の効果】本発明のセメント添加剤は、セメントペ
ースト、モルタル、コンクリートなどのセメント組成物
に配合することによって、セメント組成物が流動性に優
れ、スランプロスが少なく、コールドジョイントの発生
が少なく、特に環境温度が高くセメント組成物の温度が
たとえば25℃を超える場合にも、特別な冷却装置を必
要とすることなく、施工性が良好となる。また、本発明
のセメント添加剤は、レディーミクストコンクリート用
の減水剤、流動化剤、高性能AE減水剤、暑中コンクリー
ト用減水剤として、あるいはコンクリート製品製造用高
性能減水剤として、また左官、床仕上げ、グラウトなど
に用いるプレミツクス製品用の減水剤として有効に使用
でき、土木ならびに建築関係の工事における作業性を著
しく改善するものであり、ポンプ圧送性や表面仕上げに
も優れ、その効果は特に環境温度の高い夏場で顕著とな
る。
The cement additive of the present invention is blended with a cement composition such as cement paste, mortar, concrete, etc., so that the cement composition has excellent fluidity, low slump loss, and low occurrence of cold joints. In particular, even when the environmental temperature is high and the temperature of the cement composition exceeds, for example, 25 ° C., the workability is improved without requiring a special cooling device. In addition, the cement additive of the present invention may be used as a water reducing agent for ready-mixed concrete, a superplasticizer, a high-performance AE water reducing agent, a water reducing agent for hot concrete, or as a high-performance water reducing agent for concrete product manufacturing, or as a plasterer or floor. It can be used effectively as a water reducing agent for premix products used in finishing and grouting, and it significantly improves workability in civil engineering and construction related works. It becomes remarkable in summer when temperature is high.

───────────────────────────────────────────────────── 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 103:20 103:30 (72)発明者 山下 裕毅 千葉県佐倉市大作二丁目4番2号 秩父小 野田株式会社中央研究所内──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. 6 Identification code Agency reference number FI Technical display location // C04B 103: 20 103: 30 (72) Inventor Hiroki Yamashita 2-4 Daisaku, Sakura City, Chiba Prefecture No.2 Chichibu Onoda Central Research Laboratory

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 一般式(1) CH2=CH-CH2O-(AO)nR ……(1) (ただし、AOは炭素数2〜4のオキシアルキレン基
で、その50〜100モル%はオキシエチレン基であ
り、Rは炭素数1〜4のアルキル基、nは10〜20
0)で示されるポリオキシアルキレン化合物及び無水マ
レイン酸を必須成分とする共重合物、この共重合物の加
水分解物及びこの共重合物の加水分解物の塩のうちの少
なくとも1種を有効成分とする減水剤と、 オキシカルボン酸、ホスホン酸及びその誘導体のうちの
少なくとも1種を有効成分とする遅延剤とを組み合わせ
ることを特徴とするセメント添加剤。
1. A compound represented by the general formula (1): CH 2 -CH—CH 2 O— (AO) n R (1) (where AO is an oxyalkylene group having 2 to 4 carbon atoms, and 50 to 100 moles thereof) % Is an oxyethylene group, R is an alkyl group having 1 to 4 carbon atoms, and n is 10 to 20%.
0) a copolymer containing a polyoxyalkylene compound and maleic anhydride as essential components, a hydrolyzate of this copolymer and a salt of a hydrolyzate of this copolymer as an active ingredient A cement additive comprising a combination of a water reducing agent as described above and a retarder containing at least one of oxycarboxylic acid, phosphonic acid and derivatives thereof as an active ingredient.
【請求項2】 オキシカルボン酸が、グルコン酸、クエ
ン酸及びこれらのアルカリ金属塩、アルカリ土類金属塩
のなかから選ばれたものであることを特徴とする請求項
1に記載のセメント添加剤。
2. The cement additive according to claim 1, wherein the oxycarboxylic acid is selected from gluconic acid, citric acid and their alkali metal salts and alkaline earth metal salts. .
【請求項3】 ホスホン酸及びその誘導体が、アミノト
リ(メチレンホスホン酸)、1-ヒドロキシエチリデン-1,1
-ジホスホン酸、エチレンジアミンテトラ(メチレンホス
ホン酸)、ジエチレントリアミンペンタ(メチレンホスホ
ン酸)及びこれらのアルカリ金属塩、アルカリ土類金属
塩のなかから選ばれたものであることを特徴とする請求
項1または2に記載のセメント添加剤。
3. The phosphonic acid and its derivative are aminotri (methylenephosphonic acid), 1-hydroxyethylidene-1,1
3. Diphosphonic acid, ethylenediaminetetra (methylenephosphonic acid), diethylenetriaminepenta (methylenephosphonic acid) and their alkali metal salts and alkaline earth metal salts. A cement additive according to claim 1.
【請求項4】 セメント100重量部に対し、減水剤を
0.03〜1重量部、遅延剤を0.01〜1重量部添加
することを特徴とする請求項1ないし3のいずれかに記
載のセメント添加剤の使用方法。
4. The method according to claim 1, wherein 0.03 to 1 part by weight of a water reducing agent and 0.01 to 1 part by weight of a retarder are added to 100 parts by weight of cement. How to use cement additives.
JP18415796A 1996-06-25 1996-06-25 Cement additive and use of the same Pending JPH107446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18415796A JPH107446A (en) 1996-06-25 1996-06-25 Cement additive and use of the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18415796A JPH107446A (en) 1996-06-25 1996-06-25 Cement additive and use of the same

Publications (1)

Publication Number Publication Date
JPH107446A true JPH107446A (en) 1998-01-13

Family

ID=16148370

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18415796A Pending JPH107446A (en) 1996-06-25 1996-06-25 Cement additive and use of the same

Country Status (1)

Country Link
JP (1) JPH107446A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003073157A (en) * 2001-09-04 2003-03-12 Nippon Shokubai Co Ltd Cement admixture and method of execution of cement composition
JP2005082426A (en) * 2003-09-05 2005-03-31 Dai Ichi Kogyo Seiyaku Co Ltd Anti-solidifying agent for granulated blast furnace slag, and granulated blast furnace slag
JP2010006701A (en) * 2009-10-06 2010-01-14 Nippon Shokubai Co Ltd Method for producing cement admixture
JP2014108911A (en) * 2012-12-03 2014-06-12 Takenaka Komuten Co Ltd Blast-furnace slag-containing cement slurry composition and method for preparing soil cement slurry
JP2016029005A (en) * 2014-07-22 2016-03-03 株式会社大林組 Concrete for placement on fresh concrete

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003073157A (en) * 2001-09-04 2003-03-12 Nippon Shokubai Co Ltd Cement admixture and method of execution of cement composition
JP2005082426A (en) * 2003-09-05 2005-03-31 Dai Ichi Kogyo Seiyaku Co Ltd Anti-solidifying agent for granulated blast furnace slag, and granulated blast furnace slag
JP2010006701A (en) * 2009-10-06 2010-01-14 Nippon Shokubai Co Ltd Method for producing cement admixture
JP2014108911A (en) * 2012-12-03 2014-06-12 Takenaka Komuten Co Ltd Blast-furnace slag-containing cement slurry composition and method for preparing soil cement slurry
JP2016029005A (en) * 2014-07-22 2016-03-03 株式会社大林組 Concrete for placement on fresh concrete

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