JPH07106932B2 - Quick-setting agent for spraying - Google Patents
Quick-setting agent for sprayingInfo
- Publication number
- JPH07106932B2 JPH07106932B2 JP4305487A JP4305487A JPH07106932B2 JP H07106932 B2 JPH07106932 B2 JP H07106932B2 JP 4305487 A JP4305487 A JP 4305487A JP 4305487 A JP4305487 A JP 4305487A JP H07106932 B2 JPH07106932 B2 JP H07106932B2
- Authority
- JP
- Japan
- Prior art keywords
- quick
- setting
- spraying
- strength
- sodium aluminate
- 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、モルタル又はコンクリートの吹付け用急結剤
に関する。TECHNICAL FIELD The present invention relates to a quick-setting admixture for spraying mortar or concrete.
（従来の技術） セメント材料やコンクリート材料に、少量の急結剤を添
加して、これをトンネルや建築物の壁面に吹付け固化さ
せる吹付け工法が、一般に採用されている。(Prior Art) A spraying method in which a small amount of a quick-setting agent is added to a cement material or a concrete material, and this is sprayed and solidified on the wall surface of a tunnel or a building is generally adopted.
従来、吹付け用急結剤としては、アルミン酸塩、アルカ
リ炭酸塩、カルシウムアルミネートが、単独に又は組み
合わせて使用されている。Conventionally, aluminates, alkali carbonates, and calcium aluminates have been used alone or in combination as the quick-setting agent for spraying.
しかし、アルミン酸塩、アルカリ炭酸塩の使用は、単独
・組み合わせのいずれにおいても急結性がシャーブでな
い為、湧水個所の施工等において問題が多かった。又、
急結剤のセメントに対する最適添加量の範囲が狭く、実
際の施工現場での管理が難しいという問題があった。更
に吹付け後のモルタルやコンクリートの強度発限性が悪
く、特に若材令時での強度が低く、又、長期強度の伸び
が低いという欠点を有していた。アルミン酸塩はアルミ
ン酸ナトリウムが代表的な材料であるが、通常使用され
ているものは吸湿性が高く、長期安定性が非常に悪いと
いう欠点もあった。However, the use of aluminates and alkali carbonates has many problems in the construction of spring locations because the quick setting property is not a sheave, either alone or in combination. or,
There was a problem that the range of the optimum addition amount of the quick-setting admixture to the cement was narrow and it was difficult to manage at the actual construction site. Further, the mortar and concrete after spraying have poor strength limitability, and particularly have a low strength at a young age, and have a low long-term strength elongation. Sodium aluminate is a typical material for the aluminate, but the commonly used ones have the drawbacks of high hygroscopicity and very poor long-term stability.
一方、カルシウムアルミネートを主成分とした物は前者
に比較して急結性はシャープであり、強度発現は十分で
あるが、モルタルやコンクリートに添加する量を多量に
要するという欠点があった。On the other hand, the one containing calcium aluminate as a main component has sharper setting property than the former and has sufficient strength development, but has a drawback that a large amount is added to mortar or concrete.
（発明が解決しようとする問題点） 本発明は、従来の吹付け用急結剤の有する欠点を解消
し、下記の条件を満足する急結剤を提供することを目的
とする。(Problems to be Solved by the Invention) An object of the present invention is to solve the drawbacks of the conventional quick-setting agents for spraying and to provide a quick-setting agent that satisfies the following conditions.
急結性がシャープである。The sharpness is sharp.
低添加量で凝結時間が短い。Low addition amount and short setting time.
添加量に比例して凝結時間が短縮する。The setting time is shortened in proportion to the added amount.
初期強度及び長期強度が高い。High initial strength and long-term strength.
望ましくは取り扱いが容易であり、かつ変質しない。Desirably, it is easy to handle and does not deteriorate.
（問題点を解決するための手段） 本発明者は、上記条件を満足する急結剤を開発すべく鋭
意検討を重ね、消石灰とアルミン酸ナトリウム及び炭酸
ナトリウムを特定の構成比で組み合わせたものが急結剤
として極めて優れていることを見出し、本発明を完成し
た。(Means for Solving Problems) The present inventor has conducted extensive studies in order to develop a quick-setting admixture satisfying the above-mentioned conditions, and a combination of slaked lime and sodium aluminate and sodium carbonate in a specific composition ratio has been proposed. They have found that they are extremely excellent as quick-setting agents and completed the present invention.
本発明になる吹付け用急結剤は、消石灰５〜25重量％、
アルミン酸ナトリウム５〜25重量％及び炭酸ナトリウム
50〜90重量％からなる吹付け用急結剤である。The quick-setting accelerator for spraying according to the present invention is 5 to 25% by weight of slaked lime,
5-25% by weight sodium aluminate and sodium carbonate
It is a quick-setting adhesive for spraying composed of 50 to 90% by weight.
本発明に使用する消石灰及び炭酸ナトリウムは工業的用
途に通常使用されるものでよい。The slaked lime and sodium carbonate used in the present invention may be those commonly used in industrial applications.
アルミン酸ナトリウムはNa2OとAl2O3を主成分として構
成されており、水溶液と粉末の２種類がある。通常は、
Al2O3/Na2Oのモル比が１未満のものが使用されている。
しかし、粉末の場合Na2Oリッチのアルミン酸ナトリウム
は、潮解性が高いため吸湿し易く、長期安定性に欠け
る。従って、本発明において使用するアルミン酸ナトリ
ウムは、Al2O3/Na2Oのモル比が１以上、好ましくは１〜
５であることが望ましい。Sodium aluminate is composed mainly of Na 2 O and Al 2 O 3 , and there are two types, an aqueous solution and a powder. Normally,
Al 2 O 3 / Na 2 O having a molar ratio of less than 1 is used.
However, in the case of powder, sodium aluminate rich in Na 2 O has high deliquescent property, so that it easily absorbs moisture and lacks long-term stability. Therefore, the sodium aluminate used in the present invention has a molar ratio of Al 2 O 3 / Na 2 O of 1 or more, preferably 1 to
5 is desirable.
モル比が１以上であると通常品に比較して潮解性が非常
に少なく取り扱いが容易であり、かつ長期保存性がすぐ
れている。When the molar ratio is 1 or more, the deliquescent property is much less than that of a normal product, the handling is easy, and the long-term storage property is excellent.
尚、モル比（Al2O3/Na2O）が１〜５のアルミン酸ナトリ
ウムの製造法は例えば特公昭58−46450号公報に記載さ
れている。A method for producing sodium aluminate having a molar ratio (Al 2 O 3 / Na 2 O) of 1 to 5 is described in, for example, Japanese Patent Publication No. 58-46450.
次に、消石灰、アルミン酸ナトリウム、炭酸ナトリウム
の組成を限定した理由を説明する。Next, the reason for limiting the composition of slaked lime, sodium aluminate, and sodium carbonate will be described.
第１図は、上記３成分の組成三角形である。FIG. 1 is a composition triangle of the above three components.
第１図において、領域Ａのものは、本発明にかかわる、
吹付け剤として好適の組成である。領域Ｃのものは、急
結性の尺度である凝結時間が非常に長く、領域Ｂのもの
は、急結性は良好であるが、強度が不十分であるとか、
急結剤の添加量に比例して凝結時間が短縮しないとかの
欠点を有し、吹付け用急結剤としては、適しない。In FIG. 1, the area A is related to the present invention,
The composition is suitable as a spraying agent. In the region C, the setting time, which is a measure of the quick setting property, is very long, and in the region B, the quick setting property is good, but the strength is insufficient.
It has a defect that the setting time is not shortened in proportion to the amount of the quick-setting agent added, and is not suitable as a quick-setting agent for spraying.
（実施例及び比較例） 本発明の効果を明瞭にするため、実施例及び比較例につ
いて説明するが、本発明の技術的範囲は実施例に限定さ
れるものではない。(Examples and Comparative Examples) To clarify the effects of the present invention, examples and comparative examples will be described, but the technical scope of the present invention is not limited to the examples.
試験は（１）凝結試験ならびに（２）強度試験を行なっ
た。The tests were (1) setting test and (2) strength test.
（１）凝結試験、及び（２）強度試験はモルタルミキサ
ーを使用し、細骨材（鹿島産FM2.7）1500gに１次水90g
を加えて１分間空練りして含水率６重量％とした。For (1) setting test and (2) strength test, mortar mixer was used, and fine aggregate (FM2.7 produced by Kashima) 1500 g, primary water 90 g
Was added and kneaded for 1 minute to adjust the water content to 6% by weight.
次にセメント（日本セメント（株）製）500gと所定量の
急結剤をミキサーヘ投入して30秒間空練りしたのち、２
次水160gを投入して15秒間混練し、直ちにこれを型枠に
つめ、プロクター貫入抵抗試験（ASTM−Ｃ−403）及び
強度試験（JIS R 5201）を行った。Next, 500 g of cement (manufactured by Nippon Cement Co., Ltd.) and a predetermined amount of a quick-setting agent were put into a mixer and kneaded for 30 seconds, and then 2
Next, 160 g of next water was added, and the mixture was kneaded for 15 seconds. Immediately after that, this was put in a mold and a proctor penetration resistance test (ASTM-C-403) and a strength test (JIS R 5201) were performed.
尚、試験は温度20±３℃、湿度80％以上の条件室で行
い、供試体は材令１日以降、温度20±３℃の水中養生に
供した。なおプロクター貫入抵抗試験（凝結試験）はプ
ロクター貫入値（PSI）が500PSIを始発時間、4000PSIを
終結時間とした。The test was carried out in a condition room at a temperature of 20 ± 3 ° C. and a humidity of 80% or more, and the test piece was subjected to underwater curing at a temperature of 20 ± 3 ° C. after 1 day of age. In the Proctor Penetration Resistance Test (setting test), the Proctor Penetration Value (PSI) was set to 500 PSI as the start time and 4000 PSI as the end time.
（１）凝結試験 本発明品（実施例）３成分の組成をかえた比較品及び市
販品（吹付け剤として市販されているもの）（比較例）
の急結剤添加量と終結時間の関係を調べた。使用した材
料は、アルミン酸ナトリウムについては粒度1mm以下で
あり、モル比１以上のもの（化学組成Al2O373.7重量
％、Na2O25.0重量％でAl2O3/Na2Oのモル比1.8;改良品と
いう）と市販品（化学組成Al2O353.0重量％、Na2O38.0
重量％でAl2O3/Na2Oのモル0.85）とである。消石灰と炭
酸ナトリウムは市販品で純度99.5重量％以上の材料を使
用した。(1) Coagulation test The product of the present invention (Example) A comparative product in which the composition of the three components was changed and a commercial product (commercially available as a spraying agent) (Comparative Example)
The relationship between the amount of quick-setting agent added and the termination time was investigated. Material used for the sodium aluminate or less particle size 1 mm, the molar ratio of 1 or more of (chemical composition Al 2 O 3 73.7 wt%, with Na 2 O25.0 wt% Al 2 O 3 / Na 2 O of Molar ratio 1.8; improved product) and commercial product (chemical composition Al 2 O 3 53.0% by weight, Na 2 O 38.0
% By weight of Al 2 O 3 / Na 2 O is 0.85). As slaked lime and sodium carbonate, commercially available materials having a purity of 99.5% by weight or more were used.
又、市販品Ａはアルミン酸ナトリウムを主成分とした材
料であり、市販品Ｂはカルシウムアルミネートのセメン
ト鉱物を主成分とした材料である。Further, the commercial product A is a material containing sodium aluminate as a main component, and the commercial product B is a material containing calcium aluminate cement mineral as a main component.
第１表に各組成の急結剤について急結剤の添加量と、始
発時間・終結時間との関係を示す。Table 1 shows the relationship between the amount of the quick-setting admixture and the starting time and the termination time for the quick-setting admixture of each composition.
アルミン酸ナトリウムは、改良品と通常の市販品では、
凝結時間に大差がない。 Sodium aluminate is a modified product and a normal commercial product,
There is not much difference in setting time.
No.1〜No.6に示す実施例の急結剤は市販品A,Bに比較し
て、急結剤の添加量が少量でも、短い凝結時間を示すの
で経済的に有利である。Compared with the commercial products A and B, the quick-setting agents of the examples shown in No. 1 to No. 6 are economically advantageous because they show a short setting time even if the addition amount of the quick-setting agent is small.
又、急結剤の急結作用はセメントに対しある特定の範囲
のみであり、この範囲外では著しく急結作用が低下する
場合がある。この現象を生じるのは市販品Ａと比較例No
8,15であり好ましくない。急結剤の添加量に比例して凝
結時間が短縮する材料が急結剤として好ましいことはい
うまでもない。Further, the quick-setting effect of the quick-setting agent is only within a certain range with respect to the cement, and outside this range, the quick-setting effect may be significantly reduced. This phenomenon is caused by the commercially available product A and the comparative example No.
It is 8,15 and not preferable. Needless to say, a material whose setting time is shortened in proportion to the amount of the quick-setting agent is preferable as the quick-setting agent.
（２）強度試験 強度が高い程、良い急結剤であることはいうまでもな
い。しかし、一般的に急結剤を添加したモルタル又はコ
ンクリートは急結剤無添加のモルタル又はコンクリート
に比較して初期強度は良好であるが、長期強度は大幅に
低下する。(2) Strength test Needless to say, the higher the strength, the better the setting agent. However, in general, mortar or concrete to which a quick-setting agent is added has better initial strength than mortar or concrete without a quick-setting agent, but long-term strength is significantly reduced.
実施例（No.1,2,3,4,5,6）と比較例（No.7,9,14,16及び
市販品Ｂ）を用いて、急結剤の添加量の増減における圧
縮強度の測定を材令３時間、１日、７日、28日時につい
て実施した。この結果を第２表に示す。Using the examples (No.1,2,3,4,5,6) and comparative examples (No.7,9,14,16 and commercial product B), the compressive strength when the amount of the quick-setting admixture is increased or decreased. Was measured for 3 hours, 1 day, 7 days and 28 days. The results are shown in Table 2.
実施例と比較例とを比べて若材令時（３時間）の強度に
大差は見られないが、長期材令時（28日）の強度は実施
例のものが優れている。 Although there is no great difference in the strength between the young and old (3 hours) compared with the examples and the comparative examples, the strength of the examples is superior for the long-term (28 days).
又、アルミン酸ナトリウムについて改良品と市販品とし
ては強度に大差はない。Further, regarding the sodium aluminate, there is no great difference in strength between the improved product and the commercial product.
アルミン酸ナトリウムにおいてAl2O3/Na2Oのモル比は１
以上のものと（改良品）と通常の市販品について、取り
扱い性及び長期安定性についての比較を実施した。モル
比１以上のものとして化学組成がAl2O373.7重量％、Na2
O25.0重量％であり、Al2O3/Na2Oのモル比が1.8のものを
使用し、市販品として化学組成がAl2O353.0重量％、Na2
O38.0重量％であり、Al2O3/Na2Oのモル比が0.85のもの
を使用した。The molar ratio of Al 2 O 3 / Na 2 O in sodium aluminate is 1
The above-mentioned products (improved products) and ordinary commercial products were compared for handling property and long-term stability. Chemical composition of Al 2 O 3 73.7% by weight, Na 2
O2 5.0% by weight, Al 2 O 3 / Na 2 O molar ratio of 1.8 is used, and as a commercial product the chemical composition is Al 2 O 3 53.0% by weight, Na 2
O3 was 8.0% by weight and the Al 2 O 3 / Na 2 O molar ratio was 0.85.
市販品は潮解性が非常に高く、屋内に１日間放置する
と、空気中の水分を吸湿して、べたべたとなり取り扱い
が困難であった。しかしモル比が１以上のものは潮解性
が殆んなく取り扱いに問題はなかった。また、乳ばちや
各種粉砕機で粉砕したが、明らかに差異が見られ、モル
比１以上のものは粉砕性は良好であるが、市販品は粉砕
後べたべたとなった。The commercial product had a very high deliquescent property, and when left indoors for 1 day, it absorbed moisture in the air and became sticky, which made it difficult to handle. However, when the molar ratio was 1 or more, there was almost no deliquescent and there was no problem in handling. In addition, when crushed with a dairy mackerel or various crushers, a clear difference was observed, and those having a molar ratio of 1 or more had good crushability, but commercial products became sticky after crushing.
これらの結果より改良品は市販品に比べ、取り扱いが容
易であり、長期的に品質が安定していると言える。From these results, it can be said that the improved product is easier to handle than the commercial product and the quality is stable in the long term.
（発明の効果） 本発明による吹付け用急結剤は、急結性がシャープであ
り、低添加量で凝結時間が短かく、添加量に比例して凝
結時間が短縮するため、現場の施工管理が容易である。(Effects of the Invention) The quick-setting adhesive for spraying according to the present invention has a sharp quick-setting property, a short addition time with a low addition amount, and a reduction in the setting time in proportion to the addition amount. Easy to manage.
又、実用性に問題がない強度を発現する。さらに、アル
ミン酸ナトリウムとしてAl2O3/Na2Oのモル比が１〜５の
ものを使用すれば、取り扱いが容易であり、かつ材料が
変質しにくいため長期安定性にすぐれている。Further, it exhibits strength with no problem in practicality. Further, when sodium aluminate having a molar ratio of Al 2 O 3 / Na 2 O of 1 to 5 is used, it is easy to handle and the material is not easily deteriorated, and thus it is excellent in long-term stability.
第１図は、消石灰、アルミン酸ナトリウム、炭酸ナトリ
ウム３成分の組成三角形である。FIG. 1 is a composition triangle of slaked lime, sodium aluminate, and sodium carbonate.
Claims (2)
ム５〜25重量％及び炭酸ナトリウム50〜90重量％からな
る吹付け用急結剤。1. A quick-setting admixture for spraying comprising 5 to 25% by weight of slaked lime, 5 to 25% by weight of sodium aluminate and 50 to 90% by weight of sodium carbonate.
比が１〜５である事を特徴とする特許請求の範囲第１項
記載の吹付け用急結剤。2. A quick-setting admixture for spraying according to claim 1, wherein the molar ratio of sodium aluminate to Al 2 O 3 / Na 2 O is 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4305487A JPH07106932B2 (en) | 1987-02-27 | 1987-02-27 | Quick-setting agent for spraying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4305487A JPH07106932B2 (en) | 1987-02-27 | 1987-02-27 | Quick-setting agent for spraying |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63210050A JPS63210050A (en) | 1988-08-31 |
| JPH07106932B2 true JPH07106932B2 (en) | 1995-11-15 |
Family
ID=12653168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4305487A Expired - Fee Related JPH07106932B2 (en) | 1987-02-27 | 1987-02-27 | Quick-setting agent for spraying |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07106932B2 (en) |
-
1987
- 1987-02-27 JP JP4305487A patent/JPH07106932B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63210050A (en) | 1988-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |