JP2779177B2 - Method for preventing weathering of hydraulic calcium aluminate - Google Patents
Method for preventing weathering of hydraulic calcium aluminateInfo
- Publication number
- JP2779177B2 JP2779177B2 JP63249145A JP24914588A JP2779177B2 JP 2779177 B2 JP2779177 B2 JP 2779177B2 JP 63249145 A JP63249145 A JP 63249145A JP 24914588 A JP24914588 A JP 24914588A JP 2779177 B2 JP2779177 B2 JP 2779177B2
- Authority
- JP
- Japan
- Prior art keywords
- hydraulic
- calcium aluminate
- weathering
- hydraulic calcium
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は水硬性カルシウムアルミネートの風化防止方
法に関し、更に詳しくは、セメント系不定形キヤスタブ
ル、コンクリート及び混和材等に使用される水硬性カル
シウムアルミネートの風化防止方法に関する。Description: FIELD OF THE INVENTION The present invention relates to a method for preventing weathering of hydraulic calcium aluminate, and more particularly to hydraulic calcium used for cement-based amorphous castables, concrete and admixtures. It relates to a method for preventing weathering of aluminate.
セメントは貯蔵中に空気とふれると、湿分を吸い軽微
な水和反応を起し、同時に空中のCO2を吸収する。これ
は水和生成物と反応して、強熱減量を増し、比重も小さ
くなり、凝結もおそくなり、強さも発現性もしだいに低
下する。これがセメントの風化である。When cement comes into contact with air during storage, it absorbs moisture and causes a slight hydration reaction, while at the same time absorbing CO 2 in the air. It reacts with the hydration products, increasing the loss on ignition, lowering the specific gravity, slowing down the setting, and gradually decreasing in strength and development. This is the weathering of cement.
このセメントの風化を防止する方法として種々検討さ
れてきたが、貯蔵場所の通風を少なくするなど設備的な
防止方法が主で、良好な風化防止材が望まれていた。
（コンクリート工学ハンドブツク，朝倉書店発行等） 一方、カルシウムアルミネートの中でも水硬性カルシ
ウムアルミネートは、水を活性が強く極微量の水分によ
り水和反応を起こし、更には、炭酸ガスの吸着や炭酸化
により、一般に「風邪ひき」あるいは「風化」と呼ばれ
る水和活性の低下を生じ易いという課題を持つている。Various methods have been studied as a method for preventing the weathering of the cement, but a method for preventing the facility such as reducing ventilation in the storage place is mainly used, and a good weathering prevention material has been desired.
(Concrete engineering handbook, published by Asakura Shoten, etc.) On the other hand, among calcium aluminates, hydraulic calcium aluminate has a strong activity in water and causes a hydration reaction by a very small amount of water, and furthermore, the adsorption and carbonation of carbon dioxide gas. Accordingly, there is a problem that the hydration activity, which is generally called "cold catch" or "weathering", tends to occur.
特に空気中の水分や炭酸カスに接触させておくと、時
間変化に伴い強熱減量が著しく増加し、硬化遅れや強度
低下等の原因になつていた。In particular, when it is brought into contact with moisture or carbonic acid scum in the air, the loss on ignition significantly increases with time, leading to a delay in curing and a decrease in strength.
中でも水硬性カルシウムアルミネートと耐火材料とを
プレミツクスした不定形キヤスタブルは、耐火材料に吸
着している水分やエアー中の水分、更には、炭酸ガスに
より風化し、長期間貯蔵した製品は著しく硬化遅延した
り、逆に急硬化したりするため、使用できなかつた。こ
の風化の悪影響は、セメント添加量の少ない、低セメン
トキヤスタブルあるいは高強度キヤスタブルと呼ばれ
る、不定形キヤスタブルにおいて顕著に見られた。Above all, amorphous castables made by premixing hydraulic calcium aluminate and refractory material are weathered by the moisture adsorbed on the refractory material, the moisture in the air, and even carbon dioxide gas, and the products stored for a long time are significantly delayed in setting. , And conversely, hardened rapidly, so that it could not be used. This adverse effect of weathering was remarkably observed in an amorphous castable having a small amount of added cement, which is called a low cement castable or a high strength castable.
これまで水硬性カルシウムアルミネートの風化防止策
として、塩化ビニリデン等の袋にパツクし空気と遮断す
る方法や、耐火材料等とのプレミツクス品においては水
硬性カルシウムアルミネートと耐火材料とを個別に袋詰
めする方法等が取られていたがその効果は十分でなかつ
た。Until now, as a measure to prevent weathering of hydraulic calcium aluminate, packing in bags such as vinylidene chloride to block air, and in premix products with refractory materials etc., separate hydraulic calcium aluminate and refractory materials separately. The method of packing was used, but the effect was not enough.
本発明者は上記課題を解消すべく鋭意検討した結果、
特定の方法を用いることにより、水硬性カルシウムアル
ミネートの風化を防止できる知見を得て本発明を完成す
るに至つた。The present inventor has conducted intensive studies to solve the above problems,
By using a specific method, the present inventors have found that weathering of hydraulic calcium aluminate can be prevented, and have completed the present invention.
即ち、本発明は、水硬性カルシウムアルミネートと、
水硬性カルシウムアルミネート100重量部に対し、0.001
〜３重量部の脂肪酸類を混合粉砕することを特徴とする
水硬性カルシウムアルミネートの風化防止方法である。That is, the present invention provides a hydraulic calcium aluminate,
0.001 to 100 parts by weight of hydraulic calcium aluminate
It is a method for preventing weathering of hydraulic calcium aluminate, which comprises mixing and grinding up to 3 parts by weight of fatty acids.
以下本発明の内容を詳しく説明する。 Hereinafter, the contents of the present invention will be described in detail.
本発明にかかる水硬性カルシウムアルミネート（以下
水硬性CAという）は水硬性であつて、ボーキサイトやバ
イヤーアルミナ等のアルミナ源、生石灰や石灰石等のカ
ルシア源を使用し焼成法及び／又は電融法によつて合成
したクリンカーをボールミル、ローラーミル及びオング
ミル等の粉砕機で粉砕したものである。水硬性CAの鉱物
組成はCaOをＣ、Al3O3をＡとすると、C3A、C5A3、C12OA
7、CA、C3A5及びCA2等で示されるものであつて、具体的
にはアルミナセメントがあげられる。The hydraulic calcium aluminate (hereinafter referred to as hydraulic CA) according to the present invention is hydraulic and is calcined and / or electrofused using an alumina source such as bauxite or Bayer alumina or a calcia source such as quicklime or limestone. The clinker synthesized by the above method is crushed by a crusher such as a ball mill, a roller mill and an ong mill. Assuming that CaO is C and Al 3 O 3 is A, the mineral composition of hydraulic CA is C 3 A, C 5 A 3 , C 12 OA.
7, CA, shall apply those represented by C 3 A 5 and CA 2 or the like, in particular alumina cement and the like.
本発明にかかる脂肪酸類は、各種脂肪酸及び／又はそ
の塩であり、脂肪酸とは、アルキル基をＲとするとRCOO
Hで表わされるものであつて、飽和当脂肪酸、不飽和脂
肪酸どちらでも良い。具体的には、オレイン酸、ステア
リン酸及びパルチミン酸等であつて、ステアリン酸が特
に好ましい。The fatty acids according to the present invention are various fatty acids and / or salts thereof.
It is represented by H, and may be either a saturated fatty acid or an unsaturated fatty acid. Specifically, oleic acid, stearic acid, partimic acid and the like are preferred, with stearic acid being particularly preferred.
又、本発明にかかる脂肪酸塩は、アルカリ金属をＸと
するとRCOOXで表わされるものなどであつて、各々のナ
トリウム塩、カリウム塩及びカルシウム塩等が好まし
い。脂肪酸類のうちステアリン酸アルカリ金属塩が特に
好ましい。The fatty acid salt according to the present invention is represented by RCOOX where X is an alkali metal, and is preferably a sodium salt, a potassium salt, a calcium salt or the like. Among the fatty acids, alkali metal stearate is particularly preferred.
脂肪酸水の添加方法は、風化防止効果の面から、水硬
性CAのクリンカー粉砕時に混合粉砕する方法を行。The method of adding fatty acid water is to mix and pulverize hydraulic CA during clinker pulverization from the viewpoint of weathering prevention effect.
脂肪酸類の使用量は水硬性CA100重量部に対し、0.001
〜３重量部であり、0.01〜0.5重量部が好ましい。Fatty acids are used in an amount of 0.001 parts per 100 parts by weight of hydraulic CA.
To 3 parts by weight, preferably 0.01 to 0.5 parts by weight.
0.01重量部未満ではその効果に乏しく、３重量部を越
えるとカルシウムアルミネートの水和が著しく遅れるた
め好ましくない。If the amount is less than 0.01 part by weight, the effect is poor, and if it exceeds 3 parts by weight, hydration of calcium aluminate is undesirably delayed.
本発明の方法により製造した水硬性CAは耐風化性が向
上するため、各種耐火材や、石膏及びカルシウムサルホ
アルミネート（CSA）等の混和材とプレミキシングした
状態で長期間貯蔵可能になる。Since the hydraulic CA produced by the method of the present invention has improved weathering resistance, it can be stored for a long period of time in a premixed state with various refractory materials and admixtures such as gypsum and calcium sulfoaluminate (CSA).
特に、吸湿性の大きいシリカヒユーム等の超微粉と分
散剤の入つた低セメントキヤスタブルや水硬性CAの急硬
性を利用した気泡コンクリート等の混和材に有効であ
る。In particular, it is effective for admixtures such as low cement castable containing ultrafine powder such as silica hyum having high hygroscopicity and a dispersant, and cellular concrete utilizing the rapid hardening property of hydraulic CA.
以下実施例により本発明を更に詳しく説明する。 Hereinafter, the present invention will be described in more detail with reference to Examples.
実施例１ ボーキサイト100重量部、生石灰60重量部を配合し、
電気炉で1,650℃にて１時間溶融した。その溶融物のタ
ツピング時に、エアー圧10kg/cm2にて吹き飛ばし、表−
１に示す水硬性CAクリンカーを製造した。Example 1 100 parts by weight of bauxite and 60 parts by weight of quicklime were blended,
Melted at 1,650 ° C. for 1 hour in an electric furnace. When tapping the melt, blow it off at an air pressure of 10 kg / cm 2
The hydraulic CA clinker shown in No. 1 was produced.
上記クリンカーと表−２に示す脂肪酸類を所定量チユ
ーブミルにて混合粉砕して、ブレーン法による比表面積
で4,800cm2/gの水硬性CAを得た。A predetermined amount of the above clinker and the fatty acids shown in Table 2 were mixed and pulverized with a tube mill to obtain hydraulic CA having a specific surface area of 4,800 cm 2 / g by a Blaine method.
この水硬性CAを20℃,80％R.H.の雰囲気中に放置し所
定時間経過した時の強熱減量（以下Ig、lossという）の
増加と水和発熱時間を測定した。結果を表−２に併記す
る。尚、測定は次の方法で行つた。The hydraulic CA was allowed to stand in an atmosphere of 20 ° C. and 80% RH, and after an elapse of a predetermined time, an increase in ignition loss (hereinafter referred to as “Ig” or “loss”) and a heat generation time during hydration were measured. The results are shown in Table-2. The measurement was performed by the following method.
（１）Ig、loss:所定の時間経過した試料を1,100℃で恒
量になるまで焼成し、未放置品との熱減量の差とした。(1) Ig, loss: A sample after a lapse of a predetermined time was baked at 1,100 ° C. until a constant weight was obtained, and the difference in heat loss from that of a sample left untreated was determined.
（２）水和発熱:JIS R2521記載のモルタルの水和発熱曲
線を温度記録計にて記録し、注水から発熱ピークまでに
要した時間とした。(2) Heat of hydration: The heat of hydration of the mortar described in JIS R2521 was recorded by a temperature recorder, and the time required from the injection of water to the peak of the heat was determined.
＜使用材料＞ ボーキサイト：ガイアナ産白ボーキサイト 生 石 灰 ：日本石灰工業社製生石灰 脂肪酸類Ａ ：ステアリン酸ナトリウム，関東化学社製
試薬１級 Ｂ ：ステアリン酸、関東化学社製試薬第１級 Ｃ ：オレイン酸、関東化学社製試薬第１級 Ｄ ：パルミチン酸、関東化学社製試薬第１級 Ｅ ：ステアリン酸カリウム、関東化学社製試
薬第１級 〔発明の効果〕 以上から明らかなように、本発明の方法を用いると水
硬性CAの風化が防止でき貯蔵安定性が向上する。<Materials used> Bauxite: White bauxite from Guyana Quicklime: Quicklime manufactured by Nippon Lime Industries Co., Ltd. Fatty acids A: Sodium stearate, reagent grade 1 manufactured by Kanto Kagaku B: Stearic acid, reagent grade 1 manufactured by Kanto Kagaku C: Oleic acid, reagent grade 1 manufactured by Kanto Chemical Co. D: palmitic acid, reagent grade 1 manufactured by Kanto Chemical Co. E: potassium stearate, reagent grade 1 manufactured by Kanto Chemical Co. [Effects of the Invention] As is clear from the above, the use of the method of the present invention prevents weathering of hydraulic CA and improves storage stability.
Claims (1)
カルシウムアルミネート100重量部に対し、0.001〜３重
量部の脂肪酸類を混合粉砕することを特徴とする水硬性
カルシウムアルミネートの風化防止方法。1. A method for preventing weathering of hydraulic calcium aluminate, comprising mixing and pulverizing 0.001 to 3 parts by weight of fatty acid with respect to 100 parts by weight of hydraulic calcium aluminate and 100 parts by weight of hydraulic calcium aluminate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63249145A JP2779177B2 (en) | 1988-10-04 | 1988-10-04 | Method for preventing weathering of hydraulic calcium aluminate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63249145A JP2779177B2 (en) | 1988-10-04 | 1988-10-04 | Method for preventing weathering of hydraulic calcium aluminate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0297443A JPH0297443A (en) | 1990-04-10 |
| JP2779177B2 true JP2779177B2 (en) | 1998-07-23 |
Family
ID=17188590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63249145A Expired - Fee Related JP2779177B2 (en) | 1988-10-04 | 1988-10-04 | Method for preventing weathering of hydraulic calcium aluminate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2779177B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4571274B2 (en) * | 2000-06-16 | 2010-10-27 | 電気化学工業株式会社 | Cement admixture and cement composition |
| JP4498560B2 (en) * | 2000-08-03 | 2010-07-07 | 電気化学工業株式会社 | Cement quick-setting agent |
| JP4498592B2 (en) * | 2000-11-30 | 2010-07-07 | 電気化学工業株式会社 | Cement admixture and cement composition |
| JP4636718B2 (en) * | 2001-03-27 | 2011-02-23 | 住友大阪セメント株式会社 | Method for producing hardened concrete |
| JP4634213B2 (en) * | 2005-04-27 | 2011-02-16 | 電気化学工業株式会社 | Alumina cement composition and repair method using the same |
| JP5113610B2 (en) * | 2008-04-25 | 2013-01-09 | 電気化学工業株式会社 | Cement admixture and cement composition for mass concrete |
| JP6096039B2 (en) * | 2013-04-12 | 2017-03-15 | 太平洋マテリアル株式会社 | Quick set |
| JP6782234B2 (en) * | 2015-06-26 | 2020-11-11 | デンカ株式会社 | Manufacturing method of cement hardened material and hardened cement composition using it |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49120922A (en) * | 1973-03-12 | 1974-11-19 |
-
1988
- 1988-10-04 JP JP63249145A patent/JP2779177B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0297443A (en) | 1990-04-10 |
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