JPS63248756A - Cement set accelerator - Google Patents
Cement set acceleratorInfo
- Publication number
- JPS63248756A JPS63248756A JP7968387A JP7968387A JPS63248756A JP S63248756 A JPS63248756 A JP S63248756A JP 7968387 A JP7968387 A JP 7968387A JP 7968387 A JP7968387 A JP 7968387A JP S63248756 A JPS63248756 A JP S63248756A
- Authority
- JP
- Japan
- Prior art keywords
- molar ratio
- sodium aluminate
- cement
- setting
- accelerator
- 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
Links
- 239000004568 cement Substances 0.000 title claims description 14
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 18
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 18
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 13
- 239000000047 product Substances 0.000 description 12
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 239000004567 concrete Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000013065 commercial product Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 2
- 150000008041 alkali metal carbonates Chemical class 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007589 penetration resistance test Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、セメント用凝結硬化促進剤に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a setting and hardening accelerator for cement.
（従来の技術）
コンクリート及びモルタルは、建築・土木分野で経済的
であり、かつ使い易いために種々の個所で広く使用され
ている。(Prior Art) Concrete and mortar are widely used in various places in the field of architecture and civil engineering because they are economical and easy to use.
しかしコンクリート及びモルタルはそのままでは硬化時
間が長いため用途によっては使用しにくい場合がある。However, concrete and mortar may be difficult to use depending on the purpose because they take a long time to harden as they are.
この為、硬化時間を短縮するために、混和剤を添加する
とか特別な養生方法を採用するとか特殊セメントを使用
する等の方法がとられている。これらの方法のうちで混
和剤を添加し硬化促進するのが一般的である。この混和
剤は、一般的に凝結硬化促進剤と呼称されており、以下
の用途で主に使用されている。Therefore, in order to shorten the hardening time, methods such as adding admixtures, adopting special curing methods, and using special cements have been adopted. Among these methods, it is common to add an admixture to accelerate curing. This admixture is generally called a setting and hardening accelerator, and is mainly used in the following applications.
：現場打設工事で工期を短縮する場合、製品工場で早期
脱型を実施して生産性を上げる場合、トンネル等の吹付
工法の場合、軟弱地盤を改良するためのグラウト工法の
場合、止水・漏水防止工事の場合等。: To shorten the construction period through on-site pouring work, to improve productivity by early demolding at product factories, to spray construction methods such as tunnels, to grout methods to improve soft ground, to stop water.・For water leakage prevention work, etc.
この種の促進剤として塩化カルシウム及びアルミン酸ナ
トリウムが代表的なものである。Typical accelerators of this type are calcium chloride and sodium aluminate.
塩化カルシウムで代表される塩化物は促進剤としてすぐ
れており凝結時間の短縮、強度増進に効果はあるが、コ
ンクリート中の鉄筋等を発錆させル欠点がある。アルミ
ン酸ナトリウムは促進剤として有効であり、発錆性はな
いという利点がある。Chlorides, represented by calcium chloride, are excellent accelerators and are effective in shortening setting time and increasing strength, but they have the disadvantage of causing rust in reinforcing bars in concrete. Sodium aluminate is effective as an accelerator and has the advantage of not being rust-prone.
アルミン酸ナトリウムは、Ｎａ２ＯとＡｔ２０３とを主
成物として構成されており、水溶液のものと粉末のもの
とがある。促進剤としては、両者とも使用できるが貯蔵
や運搬などにおいては、粉末状のものを使用する方が便
利なことが多い。また、アルミン酸ナトリウムを単独で
促進剤として使用することもあるが、これにアルカリ金
属炭酸塩（炭酸ナトリウム、炭酸カリウムなど）及び硫
酸塩等を助剤又は増粘剤として併用することも可能であ
る。Sodium aluminate is mainly composed of Na2O and At203, and is available in aqueous solutions and powders. Although both can be used as accelerators, it is often more convenient to use powdered ones for storage and transportation. In addition, although sodium aluminate is sometimes used alone as an accelerator, it is also possible to use it in combination with alkali metal carbonates (sodium carbonate, potassium carbonate, etc.) and sulfates as auxiliaries or thickeners. be.
後者の場合に、これらを予め一定の割合で混合しておく
と使用に際して便利である。この場合には、アルミン酸
ナトリウムは粉末状のものを使う方が取りあつかい易い
。In the latter case, it is convenient to mix these in a certain ratio beforehand. In this case, it is easier to handle sodium aluminate in powder form.
アルミン酸ナトリウムは、Ａｔ２０３／Ｎａ２Ｏのモル
比が１未満のものが、一般に使用されているが、粉末の
場合においては、Ｎａ２Ｏリッチのものは、潮解性が高
いだめ吸湿し易く長期安定性に欠けるため、セメント用
凝結硬化促進剤として取り扱い難いという欠点があった
。Sodium aluminate with a molar ratio of At203/Na2O of less than 1 is generally used, but in the case of powder, those rich in Na2O have high deliquescent properties, easily absorb moisture, and lack long-term stability. Therefore, it has the disadvantage that it is difficult to handle as a setting and hardening accelerator for cement.
（発明が解決しようとする問題点）
本発明は、上記問題点を解決し、長期的に性状が安定し
、取りあつかいの容易なセメント用凝結硬化促進剤を提
供することにある。(Problems to be Solved by the Invention) An object of the present invention is to solve the above-mentioned problems and provide a setting and hardening accelerator for cement that has stable properties over a long period of time and is easy to handle.
（問題点を解決するだめの手段）
本発明者は、アルミン酸ナトリウムを含む、セメント用
凝結硬化促進剤が、硬化速度促進の点で優れていること
に着目し、その吸湿性、長期不安定性など取り扱い上の
難点を解消すべく、鋭意検討を重ねた結果本発明を完成
した。本発明になるセメント用凝結硬化促進剤は、Ａｔ
２０３／Ｎａ ２０のモル比が１以上であるアルミン酸
ナトリウムを含有することを特徴とする。(Another Means to Solve the Problems) The present inventor has focused on the fact that a setting and hardening accelerator for cement containing sodium aluminate is excellent in terms of accelerating hardening speed, and has discovered that its hygroscopicity and long-term instability The present invention was completed as a result of extensive research in order to resolve these handling difficulties. The setting hardening accelerator for cement according to the present invention is At
It is characterized by containing sodium aluminate having a molar ratio of 203/Na20 of 1 or more.
本発明において使用するアルミン酸ナトリウムは、Ａｔ
２０３／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。The sodium aluminate used in the present invention is At
203/Na2O molar ratio is 1 or more, preferably 1 to 5
It is desirable that
モル比が１以上であると１未満である通常品に比較して
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 lower than that of ordinary products where the molar ratio is less than 1, and the product is easy to handle and has excellent long-term storage stability.
゛ 尚、モル比（Ａｔ２０３／Ｎａ２Ｏ）が１〜５のア
ルミン酸ナトリウムの製造法は特公昭５８−４６４５０
、特開昭５８−１４５６１９．特開昭５８−１４０３１
７に記載されている。゛ The method for producing sodium aluminate with a molar ratio (At203/Na2O) of 1 to 5 is disclosed in Japanese Patent Publication No. 58-46450.
, Japanese Patent Publication No. 58-145619. Japanese Patent Publication No. 58-14031
7.
凝結硬化促進剤の使用量は、使用目的によって異なるが
、セメント１００重量部に対して１〜１０重量部配合す
る事が好ましく、数分から３０分程度で凝結が開始する
事が望ましい。促進剤としては、アルミン酸す） ＩＪ
ウムを単独で使用可能であり ｓｄ
る拳、これにアルカリ金属炭酸塩（炭酸ナトリウム、炭
酸カリウム）及び硫酸塩を助剤又は増粘剤としても併用
することが可能である。又セメントは一般的に普通ポル
トランドセメントが使用されるが、これ以外の各種セメ
ント（早強ポルトランドセメント、白色ポルトランドセ
メント、耐硫酸塩ポルトランドセメント、中庸熱ポルト
ランドセメント等）にも適用が可能である。The amount of setting and hardening accelerator to be used varies depending on the purpose of use, but it is preferably 1 to 10 parts by weight per 100 parts by weight of cement, and it is desirable that setting starts in about a few minutes to 30 minutes. As an accelerator, aluminic acid) IJ
It is possible to use sd alone, but it is also possible to use it in combination with alkali metal carbonates (sodium carbonate, potassium carbonate) and sulfates as auxiliaries or thickeners. Generally, ordinary Portland cement is used as the cement, but various other cements (early strength Portland cement, white Portland cement, sulfate-resistant Portland cement, moderate heat Portland cement, etc.) can also be used.
更に骨材として細骨材を混入したモルタル、細骨材・粗
骨材を混入したコンクリートにもいづれも使用ができる
。Furthermore, it can be used for both mortar mixed with fine aggregate and concrete mixed with fine aggregate or coarse aggregate.
（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) In order 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.
試験は凝結試験及び強度試験を中心に実施した。Tests were conducted mainly on setting tests and strength tests.
モルタルミキサーにセメントｓｏｏｇと所定量の促進剤
と細骨材１０００．９（鹿島量）ＦＭ２．７を投入して
１分間空練りしたのち、水１８０ｇを投入して１５秒間
混練し、直ちにこれを型枠につめ、プロフタ−貫入抵抗
試験（ＡＳＴＭ −Ｃ−４０３）及び強度試験（ＪＩＳ
Ｒ５２（）１）ｅ行った。尚、試験は温度２０±３℃、
湿度６５４ ＲＨの条件室で行い、ブロクター貫入値（
ＰＳＩ ）が５００ ＰＳＩを始発時間とした。Cement soog, a predetermined amount of accelerator, and fine aggregate 1000.9 (Kashima amount) FM2.7 were put into a mortar mixer and mixed for 1 minute, then 180g of water was added and kneaded for 15 seconds, and then immediately mixed. Packed into formwork, profiler penetration resistance test (ASTM-C-403) and strength test (JIS
R52()1)e went. The test was conducted at a temperature of 20±3°C.
It was carried out in a room with a humidity of 654 RH, and the Broctor penetration value (
The starting time was 500 PSI (PSI).
使用した材料は、アルミン酸ナトリウムについては粒度
１關以下であり、モル比１以上のもの（化学組成Ａｔ２
０３７３．７重量％ 、Ｎａ２Ｏ２５−０重量％でｋＬ
２０５ ／Ｎａ ２０のモル比１．８；改良品という
）と市販品（化学組成Ａｔ２０．５３．０重量％、Ｎａ
２０３８．０重量％でＡｔ２０３／Ｎａ２Ｏのモル比０
．８５ ＞とである。炭酸ナトリウムは市販品で純度９
９．５重量−以上の材料を使用した。The materials used had a particle size of 1 or less for sodium aluminate, and a molar ratio of 1 or more (chemical composition At2).
0373.7% by weight, kL at 5-0% by weight of Na2O2
205/Na20 molar ratio 1.8; referred to as an improved product) and a commercial product (chemical composition At20.53.0% by weight, Na
2038.0 wt% and At203/Na2O molar ratio 0
．． 85>. Sodium carbonate is commercially available and has a purity of 9.
Materials weighing more than 9.5% by weight were used.
試験結果を第１表に示す。アルミン酸す） ＩＪウムの
Ａｔ２０５／Ｎ＆ ２０のモル比が１以上である１、８
（改良品）ものと１以下である０、８５（市販品）のも
のとを含有する促進剤を比較したが凝結始発時間及び強
度に大差はなかった。The test results are shown in Table 1. Aluminic acid) 1,8 in which the molar ratio of At205/N&20 of IJum is 1 or more
(Improved product) and 0.85 (commercial product), which is less than 1, were compared, but there was no significant difference in setting initial time and strength.
アルミン酸ナトリウムにおいてＡｔ２０５／Ｎａ ２０
のモル比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Ａｔ２０３
７３．７重ｔ％、Ｎａ ２０２５．０重量％であり、Ａ
ｔ２０３／Ｎａ ２０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Ａｔ２０３５３．０重量％Ｎ
ａｚ０３８．０重量％であり、Ａｔ２０３／Ｎａ２Ｏの
モル比が０．８５のものを使用した。At205/Na20 in sodium aluminate
A comparison was made regarding ease of handling and long-term stability between a product with a molar ratio of 1 or more (improved product) and a normal commercial product. The chemical composition is At203 as a molar ratio of 1 or more.
73.7% by weight, Na 2025.0% by weight, A
A product with a molar ratio of t203/Na20 of 1.8 was used, and as a commercially available product, the chemical composition was At20353.0%N by weight.
The content of az0 was 38.0% by weight, and the molar ratio of At203/Na2O 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
殆んど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だが、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りだ。Commercially available products have very high deliquescent properties, and if left indoors for one day, they absorb moisture from the air and become sticky, making them difficult to handle. However, those with a molar ratio of 1 or more had almost no deliquescent property and were not a problem in handling. In addition, when crushed with a pestle or various types of crushers, there was a clear difference.
Those with a molar ratio of 1 or more have good pulverization properties, but commercially available products are sticky after being pulverized.
これらの結果より本発明になる改良品アルミン酸ナトリ
ウムを含む促進剤は一般市販品アルミン酸ナトリウムを
含む促進剤に比べ、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 accelerator containing the improved sodium aluminate of the present invention is easier to handle and has stable quality over a long period of time compared to the accelerator containing the commercially available sodium aluminate.
（発明の効果）
本発明によるＡｔ２０３／Ｎａ ２０のモル比が１以上
であるアルミン酸ナトリウムを含有するセメント用凝結
硬化促進剤は、一般に市販されているアルミン酸ナトリ
ウム（Ａｔ２０３／Ｎａ２Ｏのモル比１以下）を含有す
るセメント用凝結硬化促進剤とほぼ同一の性能が示し市
販品のアルミン酸ナトリウム含有のものよりも取り扱い
が容易であり、かつ材料が変質しにぐいため、長期安定
性にすぐれている。(Effects of the Invention) The setting and hardening accelerator for cement containing sodium aluminate having an At203/Na20 molar ratio of 1 or more according to the present invention is a commonly commercially available sodium aluminate (At203/Na2O molar ratio of 1 or more). It has almost the same performance as a setting and hardening accelerator for cement containing the following), is easier to handle than commercially available products containing sodium aluminate, and has excellent long-term stability because the material is less likely to deteriorate. There is.
Claims (1)
るアルミン酸ナトリウムを含有することを特徴とするセ
メント用凝結硬化促進剤。1. A setting and hardening accelerator for cement, which contains sodium aluminate having a molar ratio of Al_2O_3/Na_2O of 1 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7968387A JPS63248756A (en) | 1987-04-02 | 1987-04-02 | Cement set accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7968387A JPS63248756A (en) | 1987-04-02 | 1987-04-02 | Cement set accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63248756A true JPS63248756A (en) | 1988-10-17 |
Family
ID=13697001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7968387A Pending JPS63248756A (en) | 1987-04-02 | 1987-04-02 | Cement set accelerator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63248756A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0711623A (en) * | 1993-06-25 | 1995-01-13 | Kyokado Eng Co Ltd | Chemical for ground grouting |
-
1987
- 1987-04-02 JP JP7968387A patent/JPS63248756A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0711623A (en) * | 1993-06-25 | 1995-01-13 | Kyokado Eng Co Ltd | Chemical for ground grouting |
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