JPH0764607B2 - Shrinkage reduction cement additive - Google Patents
Shrinkage reduction cement additiveInfo
- Publication number
- JPH0764607B2 JPH0764607B2 JP63318932A JP31893288A JPH0764607B2 JP H0764607 B2 JPH0764607 B2 JP H0764607B2 JP 63318932 A JP63318932 A JP 63318932A JP 31893288 A JP31893288 A JP 31893288A JP H0764607 B2 JPH0764607 B2 JP H0764607B2
- Authority
- JP
- Japan
- Prior art keywords
- shrinkage
- cement
- additive
- reducing
- organic
- 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.)
- Expired - Lifetime
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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
Landscapes
- 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)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、収縮低減用セメント添加剤に関する。TECHNICAL FIELD The present invention relates to a shrinkage-reducing cement additive.
［従来の技術］ 従来、セメント組成物の乾燥収縮ひびわれを防止する目
的で使用される添加剤として、乾燥収縮自体を大幅に低
減させることが出来る有機系の乾燥収縮低減剤が知られ
ている。[Prior Art] Conventionally, as an additive used for the purpose of preventing a dry shrinkage crack of a cement composition, an organic dry shrinkage reducing agent capable of significantly reducing the dry shrinkage itself is known.
［発明が解決しようとする課題］ しかしながら、従来のものは全て液状体でありセメント
等と混合すると塊状となりやすく一粉状とすることが困
難であった。そのため、セメント等粉状体と収縮低減剤
は別々の容器に保管しておき、使用時にそれぞれ必要量
を別々に秤り取ってから水と混合するという繁雑な手順
を要していた。[Problems to be Solved by the Invention] However, all of the conventional materials are liquids, and when they are mixed with cement or the like, they easily become lumps and it is difficult to make them into one powder. Therefore, the powdery material such as cement and the shrinkage-reducing agent have to be stored in separate containers, and at the time of use, the necessary amounts have to be weighed separately and mixed with water, which is a complicated procedure.
［課題を解決するための手段］ 本発明者らは、上記問題点を解決すべく鋭意検討した結
果、本発明に到達した。すなわち、本発明は無機あるい
は有機系の吸油性を有する粉状体に液状の有機系収縮低
減剤をあらかじめ吸収させてなる収縮低減用添加剤であ
る。[Means for Solving the Problems] The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention is a shrinkage-reducing additive obtained by preliminarily absorbing a liquid organic shrinkage-reducing agent into an inorganic or organic oil-absorbing powder.
本発明において使用される粉状体としては、次のものが
挙げられる。無機系では、たとえば繊維状マグネシウム
オキシサルフェート、パーライト、炭酸カルシウム、高
炉スラグ、シリカ、フライアッシュ等が挙げられる。有
機系では、フェノール樹脂、塩化ビニリデン、尿素樹
脂、エポキシ樹脂を原料として作られたバルーン等が挙
げられる。これらのうち好ましいのは繊維状マグネシウ
ムオキシサルフェートおよび塩化ビニリデンを原料とし
て作られたバルーンである。The powdery material used in the present invention includes the following. Examples of the inorganic type include fibrous magnesium oxysulfate, perlite, calcium carbonate, blast furnace slag, silica and fly ash. Examples of the organic type include balloons made of phenol resin, vinylidene chloride, urea resin, and epoxy resin as raw materials. Of these, preferred are balloons made of fibrous magnesium oxysulfate and vinylidene chloride as raw materials.
上記粉状体が吸油性でなければならないのは、下述のよ
うに水に比して高粘性の有機系収縮低減剤を吸収させる
必要から、それに応じた吸収能を有していなければなら
ないことによる。The powdery substance must be oil-absorptive because it needs to absorb an organic shrinkage-reducing agent having a viscosity higher than that of water as described below, and therefore it must have an absorption capacity corresponding to it. It depends.
また、使用される有機系収縮低減剤としては次のものが
挙げられる。Further, the following organic shrinkage reducing agents are used.
ａ、一般式ROAOnH （１） （式中、Ｒは水素基、炭素数１〜７のアルキル基または
炭素数５〜６のシクロアルキル基、Ａは炭素数２〜３の
１種または２種のアルキレン基、ｎは１〜10の数） （式中、R1およびR2は水素基または炭素数１〜４のアル
キル基、Ａは炭素数２〜３の１種または２種のアルキレ
ン基、ｎは１〜10の数） ｃ、一般式 （式中、Ｒはｎ個の活性水素をもつ化合物の残基、Ａは
２〜３の１種または２種のアルキレン基、ｍは１〜４の
数、ｎは２〜８の数） 本発明において使用される有機系収縮低減剤としては、
通常の温度で粘度が100cps以下のものが、粉状体に吸収
させやすいために好ましい。a, a general formula ROAO n H (1) (In the formula, R is a hydrogen group, an alkyl group having 1 to 7 carbon atoms or a cycloalkyl group having 5 to 6 carbon atoms, and A is one or two kinds having 2 to 3 carbon atoms. Seed alkylene group, n is a number from 1 to 10) (In the formula, R 1 and R 2 are hydrogen groups or alkyl groups having 1 to 4 carbon atoms, A is one or two alkylene groups having 2 to 3 carbon atoms, and n is a number of 1 to 10) c, general formula (In the formula, R is a residue of a compound having n active hydrogens, A is one or two alkylene groups of 2-3, m is a number of 1 to 4, and n is a number of 2 to 8.) As the organic shrinkage reducing agent used in the invention,
It is preferable that the viscosity is 100 cps or less at a normal temperature because it can be easily absorbed by the powder.
これら有機系収縮低減剤は、粉状体に吸収させる際、１
種のみで行ってもよく、２種以上を混合して行っても良
い。These organic shrinkage-reducing agents are
It may be carried out only with one kind or may be carried out by mixing two or more kinds.
本発明において、粉状体と有機系収縮低減剤の配合割合
は、粉状体の種類により差があるが、液状の有機系収縮
低減剤を吸収させた際、べとつきが無く塊状とならない
範囲であれば、任意に選ぶことができる。たとえば、収
縮低減用セメント添加剤中、粉状体は１〜80wt％、有機
系収縮低減剤は99〜20wt％である。In the present invention, the mixing ratio of the powdery material and the organic shrinkage reducing agent is different depending on the kind of the powdery material, but when the liquid organic shrinkage reducing agent is absorbed, it is not sticky and does not become a lump. If you have it, you can choose it arbitrarily. For example, the shrinkage-reducing cement additive is 1 to 80 wt% in the powder form and 99 to 20 wt% in the organic shrinkage reducing agent.
本発明の収縮低減用セメント添加剤が使用できるセメン
トとしては、普通セメント、早強セメント、中庸熱セメ
ント、高炉セメントおよびフライアッシュセメントなど
が挙げられ、セメントの種類の影響を受けない。さら
に、骨材の種類、併用する混和剤および混和材料の制約
を受けない。すなわち、コンクリート用減水剤、空気連
行剤、膨張材その他公知のモルタルまたはコンクリート
用混和材料と併用することもできる。Examples of the cement that can be used with the shrinkage-reducing cement additive include ordinary cement, early-strength cement, moderate heat cement, blast furnace cement and fly ash cement, and are not affected by the type of cement. Furthermore, there is no restriction on the type of aggregate, the admixture used in combination, and the admixture. That is, it can be used in combination with a water reducing agent for concrete, an air entraining agent, an expansive material and other known mortar or admixture material for concrete.
本発明の収縮低減用セメント添加剤のセメントへの添加
量は、有機系収縮低減剤の種類、粉状体と有機系収縮低
減剤の配合割合によっても異なるが、セメントに対して
通常0.5〜20重量％である。添加量が0.5重量％未満では
収縮低減効果は少なく、一方20重量％を越えるとセメン
ト組成物の強度が無添加のものと比較して約2/3以下と
なり実用性において充分でない。The amount of the cement additive for shrinkage reduction of the present invention added to the cement is usually 0.5 to 20 with respect to the cement, although it varies depending on the type of the organic shrinkage reducing agent, the mixing ratio of the powder and the organic shrinkage reducing agent. % By weight. If the addition amount is less than 0.5% by weight, the effect of reducing shrinkage is small, while if it exceeds 20% by weight, the strength of the cement composition is about 2/3 or less as compared with the one without addition, which is not practical.
本発明の収縮低減用セメント添加剤は、普通一般に行わ
れているセメント混和材料と同じように使用できる。た
とえば、セメント、骨材等と混合したのち混練水を加え
ても良いし、一度練り上がつたコンクリート等に添加し
ても良い。The shrinkage-reducing cement additive of the present invention can be used in the same manner as the commonly used cement admixture. For example, after mixing with cement, aggregate, etc., kneading water may be added, or it may be added to concrete etc. which has been once kneaded.
［実施例］ 以下、実施例により本発明をさらに説明するが本発明は
これに限定されるものではない。[Examples] Hereinafter, the present invention will be further described with reference to Examples, but the present invention is not limited thereto.
本発明の収縮低減用セメント添加剤を次のようにして得
た。The shrinkage-reducing cement additive of the present invention was obtained as follows.
実施例１ 繊維状マグネシウムオキシサルフェート（商品名；モス
ハイジ）30重量部にオキシアルキレンアルキルエーテル
系の液状体収縮低減剤（商品名；テトラガードAS20）70
重量部を吸収させ本発明の収縮低減用セメント添加剤を
得た。Example 1 30 parts by weight of fibrous magnesium oxysulfate (trade name: Mosheidi) and an oxyalkylene alkyl ether-based liquid shrinkage reducing agent (trade name: Tetraguard AS 20 ) 70
By absorbing part by weight, the shrinkage-reducing cement additive of the present invention was obtained.
実施例２ 塩化ビニリデン系バルーン（商品名；マツモトマイクロ
スフェアー）10重量部にオキシアルキレンアルキルエー
テル系の液状体収縮低減剤（商品名；テトラガードA
S20）300重量部を吸収させ本発明の収縮低減用セメント
添加剤を得た。Example 2 10 parts by weight of vinylidene chloride balloon (trade name; Matsumoto Microspheres) and oxyalkylene alkyl ether-based liquid shrinkage reducing agent (trade name: Tetraguard A)
S 20) to obtain a shrinkage reducing cement additives of the present invention to absorb 300 parts by weight.
上記のようにして得られた収縮低減用セメント添加剤は
塊状とならず、セメントと混合して容易に一粉状とする
ことができた。The shrinkage-reducing cement additive obtained as described above did not become lumpy, but could be easily mixed into cement and made into one powder form.
［試験例］ 実施例１及び実施例２で得られた収縮低減用セメント添
加剤をそれぞれセメント（日本セメント（株）アサノ普
通ポルトランドセメント）に対して1.5重量％添加した
もの及びしないものについてJIS A1129のダイアルゲー
ジ法にて収縮試験を、JISR5201により強度を測定し表−
１に示す結果を得た。[Test example] About the thing which added the cement additive for shrinkage reduction obtained in Example 1 and Example 2 to cement (Nippon Cement Co., Ltd. Asano ordinary Portland cement) by 1.5weight% respectively, and JIS A1129 Shrinkage test by dial gauge method and strength measured by JISR5201
The results shown in 1 were obtained.
なお、水／セメント比は200％である。砂としては、河
川産のものを用いた。また、養生は水中養生１週間後、
さらに20℃相対湿度60％雰囲気下に所定の期間放置して
行った。The water / cement ratio is 200%. The sand used was from the river. In addition, the curing is done one week after underwater curing,
Further, the test piece was left to stand in an atmosphere of 20 ° C. and 60% relative humidity for a predetermined period.
［発明の効果］ 本発明の収縮低減用セメント添加剤は、セメント等と混
合した際塊状とならず、容易に一粉状とすることができ
る。そのため、セメント等粉状体と収縮低減剤を別々の
容器に保存しておき、使用時にそれぞれ必要量をべつべ
つに秤り取ってから水と混合するという繁雑な手順を要
しない。 [Effects of the Invention] The shrinkage-reducing cement additive of the present invention does not form a lump when mixed with cement or the like, and can be easily made into a powder. Therefore, it is not necessary to store the powdered material such as cement and the shrinkage-reducing agent in separate containers, individually weigh the necessary amounts for each, and then mix them with water.
さらに、本発明の収縮低減用セメント添加剤をセメント
に使用した場合、無添加の場合と比較して大幅な乾燥収
縮の低減がはかられる。なお、セメント組成物の大幅な
強度低下等の悪影響を及ぼすこともない。Furthermore, when the shrinkage-reducing cement additive of the present invention is used in cement, a drastic reduction in drying shrinkage can be achieved as compared with the case of no addition. In addition, it does not have a bad influence such as a significant decrease in strength of the cement composition.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 本藤 文明 京都府京都市東山区一橋野本町11番地の１ 三洋化成工業株式会社内 (56)参考文献 特開 昭62−41743（ＪＰ，Ａ) 特開 昭63−233031（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumiaki HONTO 1-11, Hitotsubinohonmachi, Higashiyama-ku, Kyoto, Kyoto Prefecture Sanyo Kasei Kogyo Co., Ltd. (56) Reference JP-A-62-41743 (JP, A) Kai 63-233031 (JP, A)
Claims (3)
体に液状の有機系収縮低減剤をあらかじめ吸収させてな
る粉状の収縮低減用セメント添加剤。1. A powdery shrinkage-reducing cement additive obtained by previously absorbing a liquid organic shrinkage-reducing agent into an inorganic or organic oil-absorbing powdery material.
グネシウムオキシサルフェート、パーライト、炭酸カル
シウム、高炉スラグ、シリカおよびフライアッシュから
なる群より選ばれるものである請求項１記載の添加剤。2. The additive according to claim 1, wherein the inorganic oil-absorbing powdery substance is selected from the group consisting of fibrous magnesium oxysulfate, perlite, calcium carbonate, blast furnace slag, silica and fly ash. .
ル樹脂、塩化ビニリデン、尿素樹脂およびエポキシ樹脂
を原料として作られたバルーンからなる群より選ばれる
ものである請求項１または２記載の添加剤。3. The organic oil-absorbing powdery material is selected from the group consisting of balloons made from phenol resin, vinylidene chloride, urea resin and epoxy resin as a raw material. Additive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63318932A JPH0764607B2 (en) | 1988-12-16 | 1988-12-16 | Shrinkage reduction cement additive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63318932A JPH0764607B2 (en) | 1988-12-16 | 1988-12-16 | Shrinkage reduction cement additive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02164754A JPH02164754A (en) | 1990-06-25 |
| JPH0764607B2 true JPH0764607B2 (en) | 1995-07-12 |
Family
ID=18104596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63318932A Expired - Lifetime JPH0764607B2 (en) | 1988-12-16 | 1988-12-16 | Shrinkage reduction cement additive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0764607B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4538199B2 (en) * | 2003-04-18 | 2010-09-08 | 太平洋セメント株式会社 | PC grout admixture and cement-based PC grout composition |
| JP5332105B2 (en) * | 2007-01-29 | 2013-11-06 | 住友大阪セメント株式会社 | Method for reducing drying shrinkage of concrete with high water absorption recycled aggregate |
| JP5085237B2 (en) * | 2007-08-30 | 2012-11-28 | 電気化学工業株式会社 | Premixed mortar and method for producing the same |
| JP5227161B2 (en) * | 2008-12-27 | 2013-07-03 | 太平洋マテリアル株式会社 | Cement admixture and cement composition |
| JP5466538B2 (en) * | 2010-03-08 | 2014-04-09 | 株式会社Ａｄｅｋａ | Powder shrinkage reducing agent for cement and cement composition containing the shrinkage reducing agent |
| JP6164887B2 (en) * | 2013-03-26 | 2017-07-19 | デンカ株式会社 | High-strength cement admixture and cement composition using the same |
| JP6252851B2 (en) * | 2014-03-20 | 2017-12-27 | 日油株式会社 | Dry shrinkage reducing agent composition for improving workability of premix mortar, premix mortar and hardened cement using the same |
| JP6752443B2 (en) * | 2016-03-30 | 2020-09-09 | 日油株式会社 | Powder drying shrinkage reducing agent for premixed mortar, premixed mortar and hardened cement |
| JP6731144B2 (en) * | 2016-05-31 | 2020-07-29 | 日油株式会社 | Premix repair mortar powder additive, premix repair mortar and hardened cement |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0714829B2 (en) * | 1985-08-12 | 1995-02-22 | 日本ゼオン株式会社 | Method for producing dry powder containing hardly volatile organic compound |
| JPH0791100B2 (en) * | 1986-12-10 | 1995-10-04 | タカタ株式会社 | How to prevent deterioration of concrete and mortar |
-
1988
- 1988-12-16 JP JP63318932A patent/JPH0764607B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02164754A (en) | 1990-06-25 |
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