JPH0545537B2 - - Google Patents
Info
- Publication number
- JPH0545537B2 JPH0545537B2 JP61007200A JP720086A JPH0545537B2 JP H0545537 B2 JPH0545537 B2 JP H0545537B2 JP 61007200 A JP61007200 A JP 61007200A JP 720086 A JP720086 A JP 720086A JP H0545537 B2 JPH0545537 B2 JP H0545537B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- low
- cement
- less
- workability
- 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
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- Ceramic Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
〔産業上の利用分野〕
本発明は、各種耐火骨材等と配合して低セメン
トキヤスタブルにした際に優れた施工性と硬化安
定性を示す低セメントキヤスタブル組成物に関す
る。
低セメントキヤスタブルは、耐スポーリング
性、耐スラグ性及び高温強度を改善するために、
アルミナセメントの使用量を１〜15％特に３〜６
％程度とし、耐火骨材の一部にSiO2，Al2O3，
SiC等の粒径1μ以下の超微粉を加え、流動性を付
与するために分散剤を添加したものである。
〔従来の技術〕
従来から用いられている低セメントキヤスタブ
ル用アルミナセメントは、5μ以下の粒子が多く、
又、ホールミル、振動ミル等で破砕粉砕されてい
る為、ミルの特性粒度分布がなだらかであつた。
この為に各種耐火骨材等と配合し低セメントキヤ
スタブルにした場合、高温での施工性に欠け、
又、低温で硬化しにくく使用雰囲気、季節により
分散剤等を細目に変え作り分けする必要があつ
た。
〔発明が解決しようとする問題点〕
本発明は、低セメントキヤスタブルが有してい
た上述の不都合を解消すべくなされたものであつ
て施工性と硬化安定性に優れた低セメントキヤス
タブル組成物を提供することにある。
〔問題点を解決するための手段〕
即ち、本発明は、Al2O3成分が70重量％を越え
る量であり、5μm以下の微粉を25重量％を以下含
み、磨砕粉砕されてなるアルミナセメントと、カ
ルボン酸類を含有してなる低セメントキヤスタブ
ル組成物である。
以下、本発明をさらに詳しく説明する。
本発明に係るアルミナセメントのAl2O3成分
は、70重量％を超える量であり、溶融法あるいは
焼成法によつて得られたアルミナセメントクリン
カーを、ローラーミル、ジエツトミルのような摩
砕粉砕機で5μm以下の微粉が25重量％以下となる
ように摩砕粉砕することによつて得ることができ
る。5μm以下の微粉が25重量％よりも多くなる
と、水和が早くなつて施工性が悪くなり、又、硬
化時間の温度依存性も強くなるので好ましくな
い。
〔作用〕
摩砕粉砕機で粉砕したものは、アルミナセメン
ト粒子の内部クラツクが少なく形状が角ばつてお
り、又、ミルの特性上5μm以下の活性微粉が生じ
にくく粒度分布もシヤープになる。この為、各粒
子の水和も統一され、硬化安定性に優れると共に
活性微粉も少ないので施工性が良好になる。
これに対し、ボールミル、振動ミルのような破
砕粉砕機で粉砕したものは、アルミナセメント粒
子に内部クラツクが生じ易く形状も球形に近く、
ミルの特性上、5μm以下の活性微粉を生じ易く粒
度分布もなだらかになる。この為、各粒子の水和
もまちまちであり硬化安定性は良くない。更に活
性微粉が多いので施工性も劣る。
本発明の組成物に含まれるカルボン酸類とは、
カルボン酸又はその塩であり、クエン酸ナトリウ
ムが好ましい。
カルボン酸類は組成物に流動性を付与する効果
が顕著である。
また、本発明の低セメントキヤスタブル組成物
に、SiO2，SiC及びAl2O3等の超微粉なども必要
に応じ混合することも可能である。
［実施例と比較例］
次に本発明の実施例と比較例を挙げて説明す
る。
表１に示すアルミナセメント５重量部、表２に
示す耐火骨材95重量部、クエン酸ナトリウム0.18
重量部（但し実験No.１〜14のみクエン酸ナトリウ
ムを添加した。）及び水8.5重量部を配合し低セメ
ントキヤスタブルを得た。その物性を表３に示
す。
また、実験No.15と実験No.16は、クエン酸ナトリ
ウムの代わりに、トリポリリン酸ナトリウム
0.001重量％とホウ酸0.00018重量％を使用したこ
と以外は実験No.１〜14と同様に行つた比較例であ
る。
表３に示すように、本発明の低セメントキヤス
タブル組成物を用いたものは、
(1) 硬化時間が雰囲気温度に影響されにくく安定
している。特に低温での硬化性が良い。
(2) 高温での施工性に優れる。
等の優れた性能を有していることがわかる。
尚物性の測定は次の方法で行つた。
１ フロー（施工性）
JIS R2553の方法で混練し、振動テーブル
（6000〜8000rpm）上でフローコーンに詰めた後、
10秒間振動を加えた時の広がり径（mm）を測定し
た。
２ 硬化時間
混練物の（発熱一時間）曲線の注水よりピーク
までの時間とした。
[Industrial Field of Application] The present invention relates to a low-cement castable composition that exhibits excellent workability and curing stability when mixed with various refractory aggregates and the like to form a low-cement castable composition. Low cement castable to improve spalling resistance, slag resistance and high temperature strength.
Reduce the amount of alumina cement used from 1 to 15%, especially from 3 to 6
%, and some of the refractory aggregate contains SiO 2 , Al 2 O 3 ,
Ultrafine powder such as SiC with a particle size of 1μ or less is added, and a dispersant is added to give fluidity. [Conventional technology] Alumina cement for low-cement castables, which has been used conventionally, has many particles of 5μ or less.
In addition, since it was crushed and ground using a whole mill, vibration mill, etc., the characteristic particle size distribution of the mill was gentle.
For this reason, when mixed with various fire-resistant aggregates etc. to make a low-cement castable, it lacks workability at high temperatures,
In addition, it is difficult to cure at low temperatures, and it is necessary to make different types of dispersants by changing the finer dispersant depending on the usage atmosphere and season. [Problems to be Solved by the Invention] The present invention has been made to solve the above-mentioned disadvantages of low-cement castables, and provides a low-cement castable composition with excellent workability and curing stability. It's about providing things. [Means for Solving the Problems] That is, the present invention provides an alumina that is ground and pulverized, containing more than 70% by weight of Al 2 O 3 components and 25% by weight or less of fine powder of 5 μm or less. This is a low cement castable composition containing cement and carboxylic acids. The present invention will be explained in more detail below. The Al 2 O 3 component of the alumina cement according to the present invention is in an amount exceeding 70% by weight, and the alumina cement clinker obtained by the melting method or sintering method is processed into a grinding machine such as a roller mill or a jet mill. It can be obtained by grinding so that the amount of fine powder of 5 μm or less is 25% by weight or less. If the amount of fine powder of 5 μm or less exceeds 25% by weight, hydration becomes rapid and workability deteriorates, and the temperature dependence of the curing time becomes strong, which is not preferable. [Operation] Alumina cement particles pulverized by a grinder have fewer internal cracks and are angular in shape, and due to the characteristics of the mill, it is difficult to produce active fine powder of 5 μm or less, resulting in a sharp particle size distribution. For this reason, the hydration of each particle is unified, resulting in excellent curing stability and less active fine powder, resulting in good workability. On the other hand, alumina cement particles that are pulverized using a crusher such as a ball mill or a vibration mill tend to have internal cracks and are close to spherical in shape.
Due to the characteristics of the mill, active fine powder of 5 μm or less tends to be produced, and the particle size distribution becomes gentle. For this reason, the hydration of each particle varies and the curing stability is not good. Furthermore, since there is a large amount of active fine powder, the workability is also poor. The carboxylic acids contained in the composition of the present invention are:
A carboxylic acid or a salt thereof, preferably sodium citrate. Carboxylic acids have a remarkable effect of imparting fluidity to the composition. Furthermore, ultrafine powders such as SiO 2 , SiC and Al 2 O 3 can also be mixed into the low-cement castable composition of the present invention, if necessary. [Examples and Comparative Examples] Next, examples and comparative examples of the present invention will be described. 5 parts by weight of alumina cement shown in Table 1, 95 parts by weight of fireproof aggregate shown in Table 2, 0.18 parts by weight of sodium citrate
parts by weight (however, sodium citrate was added only in Experiment Nos. 1 to 14) and 8.5 parts by weight of water to obtain a low cement castable. Its physical properties are shown in Table 3. In addition, in Experiment No. 15 and Experiment No. 16, sodium tripolyphosphate was used instead of sodium citrate.
This is a comparative example conducted in the same manner as Experiment Nos. 1 to 14, except that 0.001% by weight and 0.00018% by weight of boric acid were used. As shown in Table 3, those using the low cement castable composition of the present invention have (1) a stable curing time that is not easily affected by ambient temperature; It has particularly good curing properties at low temperatures. (2) Excellent workability at high temperatures. It can be seen that it has excellent performance. The physical properties were measured by the following method. 1 Flow (workability) After kneading according to the method of JIS R2553 and packing into a flow cone on a vibration table (6000 to 8000 rpm),
The spread diameter (mm) was measured when vibration was applied for 10 seconds. 2. Curing time The time from water injection to the peak of the kneaded product (one hour heat generation) curve was taken as the time.
【表】【table】
【表】【table】
【表】【table】
本発明の低セメントキヤスタブル組成物は、優
れた施工性と硬化安定性を有している。
低温では、適度な硬化時間であり高温でも十分
な施工性を兼ね備えている。
この為施工性雰囲気、季節によつて作り分けす
る必要がなく、温度変化の激しい場所での未硬
化、早硬化等のトラブルも回避できる。
The low cement castable composition of the present invention has excellent workability and curing stability. It has an appropriate curing time at low temperatures and has sufficient workability even at high temperatures. For this reason, there is no need to make different products depending on the workability atmosphere or season, and problems such as uncured or premature hardening in areas with severe temperature changes can be avoided.
Claims (1)
5μm以下の微粉を25重量％を以下を含み、磨砕粉
砕されてなるアルミナセメントとカルボン酸類を
含有してなる低セメントキヤスタブル組成物。1 Al 2 O 3 component is in an amount exceeding 70% by weight,
A low cement castable composition containing 25% by weight or less of fine powder of 5 μm or less, alumina cement obtained by grinding and pulverization, and carboxylic acids.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61007200A JPS62167241A (en) | 1986-01-18 | 1986-01-18 | Alumina cement for low cement castable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61007200A JPS62167241A (en) | 1986-01-18 | 1986-01-18 | Alumina cement for low cement castable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62167241A JPS62167241A (en) | 1987-07-23 |
| JPH0545537B2 true JPH0545537B2 (en) | 1993-07-09 |
Family
ID=11659385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61007200A Granted JPS62167241A (en) | 1986-01-18 | 1986-01-18 | Alumina cement for low cement castable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62167241A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0654291B2 (en) * | 1988-09-20 | 1994-07-20 | 株式会社島津製作所 | Spectrophotometer |
| EP2803649B1 (en) | 2013-05-15 | 2016-04-13 | Calucem GmbH | White Alumina cement |
-
1986
- 1986-01-18 JP JP61007200A patent/JPS62167241A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62167241A (en) | 1987-07-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |