JPH05139804A - Cement admixture and its quick-setting application method - Google Patents

Cement admixture and its quick-setting application method

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Publication number
JPH05139804A
JPH05139804A JP3330120A JP33012091A JPH05139804A JP H05139804 A JPH05139804 A JP H05139804A JP 3330120 A JP3330120 A JP 3330120A JP 33012091 A JP33012091 A JP 33012091A JP H05139804 A JPH05139804 A JP H05139804A
Authority
JP
Japan
Prior art keywords
cement
quick
concrete
setting
alkali metal
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.)
Granted
Application number
JP3330120A
Other languages
Japanese (ja)
Other versions
JP3162769B2 (en
Inventor
Isao Terajima
寺島　　勲
Kenkichi Hirano
健吉 平野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denka Co Ltd
Original Assignee
Denki Kagaku Kogyo KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Denki Kagaku Kogyo KK filed Critical Denki Kagaku Kogyo KK
Priority to JP33012091A priority Critical patent/JP3162769B2/en
Publication of JPH05139804A publication Critical patent/JPH05139804A/en
Application granted granted Critical
Publication of JP3162769B2 publication Critical patent/JP3162769B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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
    • 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
    • C04B28/04—Portland cements
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators
    • C04B2103/14—Hardening accelerators
    • 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
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/20—Retarders
    • C04B2103/22—Set retarders
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PURPOSE:To provide a cement admixture for the quick-setting application of concrete to be used in general construction and building fields and to provide a process for the quick-setting application of concrete. CONSTITUTION:The objective cement admixture contains a cement accelerator, a retarder and an alkali metal aluminate. The process for the quick-setting application of concrete is characterized by the separate transfer of (A) concrete, (B) a liquid suspension of a quick-setting material for cement consisting of an accelerator and a retarder and (C) a liquid containing dissolved alkali metal aluminate under pressure and the mixing of the flows to effect the quick-setting of the mixture. The gelling time and the setting time of concrete can be shortened by the use of the subject cement admixture to enable the use of the composition to the spray-application of NATM process or NTL process to which conventional concrete composition is inapplicable.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、一般土木建築分野で使
用されるコンクリートを急結させて施工するセメント混
和材及びその急結施工方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement admixture which is used in the field of general civil engineering and construction by rapidly setting concrete and a method for quick-setting the cement admixture.

【０００２】本発明におけるコンクリートとは、セメン
トペースト、モルタル、及びコンクリート又はこれらの
スラリーを総称していう。[0002] The concrete in the present invention is a generic term for cement paste, mortar, concrete or a slurry thereof.

【０００３】[0003]

【従来の技術とその課題】従来、コンクリートを急結さ
せる技術としては、例えば、カルシウムアルミネートと
無機硫酸塩を主体とする粉状又は懸濁液状のセメント急
硬材と、コンクリートとを個別に圧送してから合流混合
させて数分〜数十分で硬化させる技術が提案されている
(特開昭50−16717号公報)。2. Description of the Related Art Conventionally, as a technique for rapidly setting concrete, for example, a powdery or suspension cement quick-hardening material mainly composed of calcium aluminate and an inorganic sulfate, and concrete are individually prepared. A technique has been proposed in which it is mixed under pressure after being pumped and then cured in a few minutes to several tens of minutes.
(JP-A-50-16717).

【０００４】しかしながら、従来の技術においては、硬
化時間が短くても30秒程度であるため、数秒で凝結する
ＮＡＴＭ工法の一次吹付けライニングや、これと同程度
の時間でゲル化するＮＴＬ工法の一次ライニングなどの
新しい工法には、アルカリ金属のアルミン酸塩や炭酸塩
を主体とした組成物、カルシウムアルミネートを主体と
した組成物からなる粉体急結材、もしくは、アルカリ金
属のアルミン酸塩と炭酸塩を溶解した液体急結材等が用
いられてきた(特開昭59−156946号公報)。However, in the conventional technique, since the curing time is about 30 seconds at the shortest, the primary spraying lining of the NATM method, which sets in several seconds, and the NTL method, which gels in about the same time, are used. For new methods such as primary lining, alkali metal aluminate and carbonate-based compositions, calcium aluminate-based powder quick-setting materials, or alkali metal aluminates. A liquid quick-setting material in which a carbonate and a carbonate are dissolved has been used (JP-A-59-156946).

【０００５】しかしながら、粉体急結材は定量圧送性や
施工時における粉塵発生の面での課題があり、しかも、
液体急結材は強アルカリ性であるため、セメントの水和
が抑制されて強度増進が期待できず、作業者への安全上
の面からも課題が多いものであった。However, the quick-setting powder material has problems in terms of quantitative pumpability and dust generation during construction, and moreover,
Since the liquid quick-setting material is strongly alkaline, hydration of the cement is suppressed and strength enhancement cannot be expected, and there are many problems in terms of worker safety.

【０００６】これに変わる材料として、カルシウムアル
ミネートと無機硫酸塩を主体とした懸濁液状の急結材の
検討がなされてきた(特開昭50−16717号公報)。しかし
ながら、この懸濁状の急結材の練り置き性を十分にする
ためには、凝結遅延剤は必須であり、したがって、合流
混合させても前記課題の解決は得られなかった。As a substitute material, a suspension type quick-setting material mainly composed of calcium aluminate and an inorganic sulfate has been studied (Japanese Patent Laid-Open No. 50-16717). However, the setting retarder is indispensable in order to make the kneading property of the suspended quick-setting material sufficient, and therefore the above-mentioned problems could not be solved even by confluent mixing.

【０００７】本発明者らは、前記課題を解消すべく種々
検討を重ねた結果、強度発現が遅くはじまるため、それ
単独では急結材として使用されず、常にアルカリ炭酸塩
と併用しなければならなかったアルカリ金属アルミン酸
塩とカルシウムアルミネート等のセメント急結材を含有
する特定のセメント混和材を使用することにより、ま
た、コンクリートと、特定のセメント混和材を懸濁溶解
した液とを個別に圧送することにより、コンクリートを
数秒で急結できる知見を得て本発明を完成するに至っ
た。As a result of various studies to solve the above-mentioned problems, the inventors of the present invention start to develop the strength lately. Therefore, it is not used alone as a quick-setting material and must always be used in combination with an alkali carbonate. By using a specific cement admixture containing a cement quick-setting material such as alkali metal aluminate and calcium aluminate, the concrete and the liquid in which the specific cement admixture is suspended and dissolved can be separated. The present invention has been completed by obtaining the knowledge that concrete can be rapidly set in a few seconds by pumping to concrete.

【０００８】[0008]

【課題を解決するための手段】即ち、本発明は、セメン
ト急結材、凝結遅延剤、及びアルカリ金属アルミン酸塩
を含有してなるセメント混和材であり、さらには、コン
クリート(Ａ)と、セメント急結材と凝結遅延剤の懸濁液
状セメント急硬材(Ｂ)と、アルカリ金属アルミン酸塩を
溶解した液(Ｃ)とを個別に圧送し、合流混合して急結施
工することを特徴とするコンクリートの急結施工方法で
ある。Means for Solving the Problems That is, the present invention is a cement admixture containing a cement quick setting material, a setting retarder, and an alkali metal aluminate, and further concrete (A), Suspended cement rapid hardening material (B) of cement quick setting material and setting retarder and liquid (C) in which alkali metal aluminate is dissolved are separately pressure-fed, combined and mixed to perform quick setting. It is a characteristic concrete quick-setting construction method.

【０００９】以下、本発明をさらに詳細に説明する。The present invention will be described in more detail below.

【００１０】本発明に係るセメント急結材とは、化学成
分としてCaO、Al2O3、及びSO3を有効成分として含有す
るものであり、CaOをC、Al2O3をAとすると、C12A7、C11
A7CaF2、CA、及びC3A等のカルシウムアルミネート類
と、これらカルシウムアルミネート類と、例えば、セッ
コウや硫酸ナトリウムなどの無機硫酸塩との混合物又は
それらの溶融生成物であり、結晶質、非晶質いずれも使
用可能である。これらのうち、C12A7やC11A7CaF2の組成
を有する物を高温溶融して急冷し非晶質としたものとII
型無水セッコウとの混合物が最も急結性が良く好まし
い。The cement quick-setting material according to the present invention is one containing CaO, Al 2 O 3 and SO 3 as active ingredients as chemical components, where CaO is C and Al 2 O 3 is A, C 12 A 7 , C 11
Calcium aluminates such as A 7 CaF 2 , CA, and C 3 A, and a mixture of these calcium aluminates and, for example, an inorganic sulfate such as gypsum or sodium sulfate, or a molten product thereof, and a crystal. Both quality and amorphous can be used. Of these, those having a composition of C 12 A 7 or C 11 A 7 CaF 2 were melted at high temperature and rapidly cooled to make them amorphous.
A mixture with anhydrous gypsum type is most preferred because of its quick setting property.

【００１１】カルシウムアルミネート類の粉末度は、ブ
レーン比表面積2,000cm2/g以上が好ましく、3,000〜5,0
00cm2/gがより好ましい。The powderyness of the calcium aluminate is preferably 2,000 cm 2 / g or more of the Blaine specific surface area of 3,000 to 5,0.
00 cm 2 / g is more preferable.

【００１２】また、無機硫酸塩の粉末度は、ブレーン比
表面積2,000cm2/g以上以上が好ましく、3,000〜8,000cm
2/gがより好ましい。The fineness of the inorganic sulfate is preferably at least 2,000 cm 2 / g of Blaine specific surface area, more preferably 3,000 to 8,000 cm.
2 / g is more preferable.

【００１３】本発明では、セメント急結材中のカルシウ
ムアルミネート類と無機硫酸塩との割合は、カルシウム
アルミネート類100重量部に対して、無機硫酸塩が0.5〜
1.5重量倍が好ましい。In the present invention, the proportion of calcium aluminate and inorganic sulfate in the cement quick-setting admixture is 0.5 to 100 parts by weight of inorganic calcium sulfate.
1.5 times by weight is preferable.

【００１４】本発明に係る凝結遅延剤は、セメント急結
材の練り置き性を２時間以上保持するために必要であ
り、具体的には、クエン酸、酒石酸、リンゴ酸、及びグ
ルコン酸等の有機ビトロキシルカルボン酸や、シュ糖、
並びに、炭酸ナトリウムや炭酸カリウム等が挙げられ
る。凝結遅延剤の使用量は、特に限定されるものではな
いが、例えば、クエン酸と炭酸カリウムを使用した場合
は、セメント急結材100重量部に対して、５重量部以下
が好ましく、0.3〜２重量部がより好ましい。The setting retarder according to the present invention is necessary for maintaining the kneading property of the cement quick setting material for 2 hours or more, and specifically, citric acid, tartaric acid, malic acid, gluconic acid and the like. Organic vitroxyl carboxylic acid, sucrose,
In addition, sodium carbonate, potassium carbonate and the like can be mentioned. The amount of the setting retarder used is not particularly limited, but for example, when citric acid and potassium carbonate are used, 5 parts by weight or less is preferable with respect to 100 parts by weight of the cement quick setting material, and 0.3 to 2 parts by weight is more preferred.

【００１５】本発明においては、セメント急結材と凝結
遅延剤は、水に懸濁した状態の懸濁液状セメント急硬材
として使用することが好ましい。In the present invention, the cement quick setting material and the setting retarder are preferably used as a suspension type cement quick setting material in a state of being suspended in water.

【００１６】ここで、使用する水の量は、施工目的によ
って異なるが、初期強度の向上を目的とした場合は、水
セメント比60〜100％が好ましく、注入性や浸透性の向
上を目的とする場合は、水セメント比400〜600％でも使
用可能である。Here, the amount of water used varies depending on the purpose of construction, but for the purpose of improving the initial strength, a water-cement ratio of 60 to 100% is preferable, and the purpose is to improve the injectability and permeability. If it does, a water-cement ratio of 400-600% can also be used.

【００１７】本発明に係るアルカリ金属アルミン酸塩と
しては、アルミン酸ナトリウムやアルミン酸カリウムな
どが挙げられるが、液状として使用する場合は溶解度の
面からアルミン酸カリウムが好ましい。本発明において
は、アルカリ金属アルミン酸塩は液状、又は、一度アル
カリ金属アルミン酸塩溶液を乾燥し、例えば固形分50％
のスラリー状で使用することが可能である。液状の場合
はNa2O/Al2O3又はK2O/Al2O3のモル比は1.5以上である
が、ゲル化及び凝結時間を数秒程度とするには、1.5〜
2.0が好ましい。また、アルミン酸ナトリウム又はアル
ミン酸カリウムのNa2O/Al2O3又はK2O/Al2O3のモル比が
1.0の場合は、100℃においても溶解しないが、このスラ
リーを乾燥して、使用時に水に懸濁させてスラリー状で
添加しても同様の効果が得られる。液状アルカリ金属ア
ルミン酸塩は、NaOH又はKOH液とAl(OH)3をNa2O/Al2O3又
はK2O/Al2O3のモル比が1.5〜2.0となるように配合し、1
00℃で加熱溶解し、50％液濃度に調整するが、液状とし
て貯蔵する場合は液状アルミン酸カリウムが好ましい。
アルカリ金属アルミン酸塩の使用量は、セメント100重
量部に対して、アルカリ金属アルミン酸塩として0.2〜
５重量部が好ましい。0.2重量部未満では懸濁液状セメ
ント急硬材を添加しても10秒以内でゲル化凝結させるこ
とができず、５重量部を越えて使用しても急結効果は向
上せず、その後の強度性状に悪影響をあたえるばかり
か、耐久性の面で課題が多い。また、アルカリ金属アル
ミン酸塩とアルカリ炭酸塩とを溶解した液は、アルカリ
炭酸塩が遅延効果を示し、本発明の目的とする凝結時間
内では全く効果が認められない。Examples of the alkali metal aluminate according to the present invention include sodium aluminate and potassium aluminate, and when used in liquid form, potassium aluminate is preferable from the viewpoint of solubility. In the present invention, the alkali metal aluminate is liquid, or once the alkali metal aluminate solution is dried, for example, solid content 50%.
It is possible to use it in the form of a slurry. In the case of liquid, the molar ratio of Na 2 O / Al 2 O 3 or K 2 O / Al 2 O 3 is 1.5 or more, but in order to set the gelation and setting time to about several seconds, 1.5 to
2.0 is preferable. Further, the molar ratio of sodium aluminate or potassium aluminate Na 2 O / Al 2 O 3 or K 2 O / Al 2 O 3 is
In the case of 1.0, it does not dissolve even at 100 ° C, but the same effect can be obtained by drying this slurry, suspending it in water at the time of use, and adding it in the form of a slurry. Liquid alkali metal aluminate, NaOH or KOH liquid and Al (OH) 3 are blended so that the molar ratio of Na 2 O / Al 2 O 3 or K 2 O / Al 2 O 3 is 1.5 to 2.0, 1
It is dissolved by heating at 00 ° C and adjusted to a liquid concentration of 50%, but when it is stored as a liquid, liquid potassium aluminate is preferable.
The amount of alkali metal aluminate used is 0.2 to 10 parts by weight per 100 parts by weight of cement as alkali metal aluminate.
5 parts by weight is preferred. If it is less than 0.2 parts by weight, the rapid hardening effect cannot be improved even if the suspension cement rapid hardening material is added, and it cannot be gelled and set within 10 seconds. In addition to adversely affecting the strength properties, there are many problems in terms of durability. Further, in the liquid in which the alkali metal aluminate and the alkali carbonate are dissolved, the alkali carbonate shows a retarding effect, and no effect is observed within the setting time which is the object of the present invention.

【００１８】アルカリ金属アルミン酸塩は、あらかじめ
コンクリートに添加した場合、セメントと反応して効果
が失なわれるため好ましくなく、懸濁液状セメント急硬
材にあらかじめ添加すると懸濁液状セメント急硬材がゲ
ル化して好ましくない。Alkali metal aluminate is not preferable because it loses its effect by reacting with cement when it is added to concrete in advance. Gelling is not preferable.

【００１９】コンクリートのゲル化もしくは凝結する時
間を数秒程度とする方法として、液状アルカリ金属アル
ミン酸塩と、懸濁液状セメント急硬材を個別に圧送し、
コンクリート圧送ホースにセットされたインレットピー
スで、コンクリート圧送圧以上、例えば、７kgf/cm2以
上の圧で添加混合する方法が好ましく、セメント急硬材
とアルカリ金属アルミン酸塩の添加位置は30cmの範囲内
で個別に添加し、合流混合させる方法が好ましい。As a method of setting the time for gelling or setting of concrete to about several seconds, liquid alkali metal aluminate and suspension type cement rapid hardening material are separately pressure fed,
It is preferable to use an inlet piece set in a concrete pumping hose to add and mix it at a concrete pumping pressure or more, for example, at a pressure of 7 kgf / cm 2 or more. The addition position of cement rapid hardening material and alkali metal aluminate is within 30 cm. A method in which they are individually added and mixed by mixing is preferable.

【００２０】混合順序は特に限定されるものではない
が、アルカリ金属アルミン酸塩を先に混合することが好
ましい。The mixing order is not particularly limited, but it is preferable to mix the alkali metal aluminate first.

【００２１】懸濁液状セメント急硬材のペースト又はス
ラリーを調整する装置としては、合流部を極力短かくし
たＹ字管や、二重管を用いて一方の液を内管に、他方の
液を内管と外管との間隙部に注入し、二重管の先端部も
しくは二重管から流れ出た空中部で合流させる二重管工
法、さらには２本のパイプを近接させ、しかも空中で速
やかに合流できるように２本のパイプを配置しておく方
法などが使用可能である。As a device for adjusting the paste or slurry of the cement-hardening material in the form of a suspension cement, a Y-shaped tube in which the merging portion is made as short as possible, or a double tube is used to put one liquid in the inner pipe and the other liquid. Is injected into the gap between the inner pipe and the outer pipe, and is joined at the tip of the double pipe or in the aerial part flowing out of the double pipe. Furthermore, two pipes are placed close to each other and in the air. It is possible to use a method of arranging two pipes so that they can join quickly.

【００２２】また、懸濁液状セメント急硬材をコンクリ
ートに添加混合する方法としては、特に限定されるもの
ではないが、吹付けノズル先端から３〜５m後で、コン
クリート圧送ホース中の生コンクリートに、ＮＡＴＭ工
法で用いられているインレットピースを用いて、７kgf/
cm2程度のエアーや50〜100kgf/cm2程度の高圧水で圧入
添加する方法、また、単にインレットピースにポンプで
圧入し、管中にセットされたスパイラル状のミキサーを
油圧で回転させて混合する方法などの湿式工法の使用可
能である。The method for adding and mixing the suspension-type cement rapid hardening material to concrete is not particularly limited, but after 3 to 5 m from the tip of the spray nozzle, it is added to ready-mixed concrete in the concrete pressure-feeding hose. , 7kgf / using the inlet piece used in the NATM method
How to press fitting added cm 2, air or 50～100Kgf / cm 2, high-pressure water, also mixed simply pressed by a pump to the inlet piece, with a spiral mixer which is set into the tube is rotated by a hydraulic It is possible to use a wet method such as a method of doing.

【００２３】液状アルカリ金属アルミン酸塩の添加方法
は、懸濁液状セメント急硬材の添加される直前か直後
に、同様な添加装置を取り付けて添加する方法が好まし
い。As a method of adding the liquid alkali metal aluminate, it is preferable to add a similar adding device immediately before or after the suspension cement rapid hardening material is added.

【００２４】ＮＡＴＭ又はＮＴＬ工法で用いられている
コンクリートの使用方法としては前述の湿式工法と、乾
式工法がある。As a method of using concrete used in the NATM or NTL method, there are the above-mentioned wet method and dry method.

【００２５】ここで、乾式工法とは、懸濁液状セメント
急硬材をインレットピース内を通過するドライコンクリ
ートに添加し、さらに、その直後に同様なインレットピ
ースをセットして、液状アルカリ金属アルミン酸塩をあ
らかじめ添加した水をコンクリートに20kgf/cm2程度の
圧力で加水して生コンクリートとする方法がある。Here, the dry method is a method in which a suspension cement rapid hardening material is added to dry concrete passing through the inlet piece, and immediately after that, a similar inlet piece is set and a liquid alkali metal aluminate is added. There is a method in which water to which salt has been added in advance is added to concrete at a pressure of about 20 kgf / cm 2 to prepare fresh concrete.

【００２６】[0026]

【実施例】以下実施例により本発明を説明する。The present invention will be described with reference to the following examples.

【００２７】実施例１ 普通ポルトランドセメントと水を混合し、セメントが80
kg/100リットルとなるセメントペーストスラリーを調整
した。一方、非晶質のC12A7とII型無水セッコウとの等
重量混合物(真比重2.9)よりなる、ブレーン値5,500cm2/
gのセメント急結材、クエン酸と炭酸カリウムとを重量
比で１：３に混合した凝結遅延剤を表１に示すように各
種割合で混合して懸濁液状セメント急硬材を調整した。
また、アルカリ金属アルミン酸塩は50％アルミン酸カリ
ウム液を使用した。セメントペーストスラリーと、懸濁
液状セメント急硬材、及びアルミン酸カリウム液を混合
後、ゲル化する時間を測定した。結果を表１に併記す
る。Example 1 Normal Portland cement was mixed with water, and the cement was 80%.
A cement paste slurry of kg / 100 liter was prepared. On the other hand, it consists of an equal weight mixture of amorphous C 12 A 7 and type II anhydrous gypsum (true specific gravity 2.9), and has a Blaine value of 5,500 cm 2 /
A suspension-type cement quick-hardening material was prepared by mixing the cement quick-setting material (g) and a setting retarder, which was a mixture of citric acid and potassium carbonate in a weight ratio of 1: 3, in various proportions as shown in Table 1.
As the alkali metal aluminate, 50% potassium aluminate solution was used. After mixing the cement paste slurry, the suspension cement quick-hardening material, and the potassium aluminate liquid, the gelation time was measured. The results are also shown in Table 1.

【００２８】＜使用材料＞ カルシウムアルミネート類：C12A7、非晶質、ブレーン
3,800cm2/g 無機硫酸塩 ：II型無水セッコウ、ブレーン7,500cm2/g 凝結遅延剤ａ：クエン酸、試薬一級 〃 ｂ：炭酸カリウム、試薬一級 アルミン酸カリウム液：50％アルミン酸カリウム液 セメント：電気化学工業社製普通ポルトランドセメン
ト、真比重3.15 水 ：水道水<Materials used> Calcium aluminates: C 12 A 7 , amorphous, brane
3,800 cm 2 / g Inorganic sulfate: II type anhydrous gypsum, Blaine 7,500 cm 2 / g Setting retarder a: Citric acid, first grade reagent 〃 b: Potassium carbonate, first grade potassium aluminate liquid: 50% potassium aluminate liquid cement : Ordinary Portland cement manufactured by Denki Kagaku Co., true specific gravity 3.15 Water: Tap water

【００２９】[0029]

【表１】 [Table 1]

【００３０】表１から明らかなように、アルミン酸カリ
ウム液を添加することにより、無添加に比較してかなり
ゲル化時間を短縮することが可能となる。なお、セメン
トペーストスラリーのみにアルミン酸カリウム液を添加
してもゲル化しなかった。As is clear from Table 1, the addition of the potassium aluminate solution makes it possible to considerably shorten the gelling time as compared with the case where no addition is made. It should be noted that addition of the potassium aluminate liquid to the cement paste slurry alone did not cause gelation.

【００３１】実施例２ セメント砂比１：３で、水・セメント比55％のモルタル
に、セメント100重量部に対して、セメント急結材が10
重量部で、凝結遅延剤がセメント急結材100重量部にた
いして、0.5重量部となるように調整した水比70％の懸
濁液状セメント急硬材と、アルミン酸カリウム液を添加
混合後、ゲル化時間とその後のプロクター貫入抵抗値を
測定したこと以外は実施例１と同様に行なった。結果を
表２に併記する。Example 2 Cement sand ratio of 1: 3, water / cement ratio of 55% mortar, and cement quick-setting material 10 per 100 parts by weight of cement.
In parts by weight, 100% by weight of the set retarder is 100 parts by weight of the cement quick-setting material, and 0.5% by weight of the cement-hardening material is added to the suspension-type cement quick-hardening material with a water ratio of 70%, and the gel is added and mixed. The same procedure as in Example 1 was carried out except that the aging time and the subsequent Proctor penetration resistance value were measured. The results are also shown in Table 2.

【００３２】＜使用材料＞ 砂：姫川産天然砂、ＦＭ2.8<Materials used> Sand: Natural sand from Himekawa, FM2.8

【００３３】[0033]

【表２】 [Table 2]

【００３４】表２から明かのように、アルミン酸カリウ
ム液を添加することにより、無添加に比較して、かなり
ゲル化時間を短縮することができ、プロクター貫入抵抗
値に対しても悪影響をあたえない。なお、モルタルのみ
にアルミン酸カリウム液を添加した場合、ゲル化はする
ものの、プロクター貫入抵抗値を示さなかった。As is clear from Table 2, by adding the potassium aluminate solution, the gelling time can be considerably shortened as compared with the case where it is not added, and the puncture resistance value of the proctor is adversely affected. Absent. When the potassium aluminate solution was added only to the mortar, it gelled but did not show a proctor penetration resistance value.

【００３５】[0035]

【発明の効果】本発明のセメント混和材を使用すること
により、ゲル化時間やコンクリートの凝結時間が短縮さ
れ、従来適用できなかったＮＡＴＭ工法における吹付け
工法やＮＴＬ工法に適用可能となった。EFFECTS OF THE INVENTION By using the cement admixture of the present invention, the gelation time and the setting time of concrete can be shortened, and it has become possible to apply to the spraying method and the NTL method in the NATM method which could not be applied conventionally.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 22:14 Ｅ 2102−4Ｇ 22:12 2102−4Ｇ 24:04 2102−4Ｇ 22:08） Ｚ 2102−4Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI Technical indication C04B 22:14 E 2102-4G 22:12 2102-4G 24:04 2102-4G 22:08) Z 2102-4G

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 セメント急結材、凝結遅延剤、及びアル
カリ金属アルミン酸塩を含有してなるセメント混和材。1. A cement admixture containing a cement quick setting material, a setting retarder, and an alkali metal aluminate. 【請求項２】 セメントと請求項１記載のセメント混和
材からなるセメント組成物。2. A cement composition comprising cement and the cement admixture according to claim 1. 【請求項３】 コンクリート(Ａ)と、セメント急結材と
凝結遅延剤の懸濁液状セメント急硬材(Ｂ)と、アルカリ
金属アルミン酸塩を溶解した液(Ｃ)とを個別に圧送し、
合流混合して急結施工することを特徴とするコンクリー
トの急結施工方法。3. A concrete (A), a cement cement hardener and a suspension cement cement hardener (B), and a liquid (C) in which an alkali metal aluminate is dissolved are separately fed under pressure. ,
A quick setting method for concrete, characterized by merging and mixing to perform quick setting.
JP33012091A 1991-11-19 1991-11-19 Cement admixture and quick setting method Expired - Fee Related JP3162769B2 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
JP33012091A JP3162769B2 (en) 1991-11-19 1991-11-19 Cement admixture and quick setting method

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0769482A1 (en) * 1995-10-17 1997-04-23 Denki Kagaku Kogyo Kabushiki Kaisha Spraying material and spraying method employing it
JP2000239056A (en) * 1999-02-17 2000-09-05 Denki Kagaku Kogyo Kk Spraying material and spraying construction method
JP2001316150A (en) * 2000-05-01 2001-11-13 Denki Kagaku Kogyo Kk Quick setting agent, cement composition and spraying material using it
WO2005042432A1 (en) * 2003-10-31 2005-05-12 Denki Kagaku Kogyo Kabushiki Kaisha Rapidly curable composition for cement and process for producing the same
JP2006512272A (en) * 2002-12-27 2006-04-13 ラファージ アリュミネイト Liquid setting accelerators for compositions containing Portland cement
JP2008156229A (en) * 1997-10-17 2008-07-10 Denki Kagaku Kogyo Kk Quick-setting spray cement concrete composition, quick-setting spray cement concrete, and spray material using the cement concrete

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0769482A1 (en) * 1995-10-17 1997-04-23 Denki Kagaku Kogyo Kabushiki Kaisha Spraying material and spraying method employing it
JP2008156229A (en) * 1997-10-17 2008-07-10 Denki Kagaku Kogyo Kk Quick-setting spray cement concrete composition, quick-setting spray cement concrete, and spray material using the cement concrete
JP2000239056A (en) * 1999-02-17 2000-09-05 Denki Kagaku Kogyo Kk Spraying material and spraying construction method
JP2001316150A (en) * 2000-05-01 2001-11-13 Denki Kagaku Kogyo Kk Quick setting agent, cement composition and spraying material using it
JP2006512272A (en) * 2002-12-27 2006-04-13 ラファージ アリュミネイト Liquid setting accelerators for compositions containing Portland cement
WO2005042432A1 (en) * 2003-10-31 2005-05-12 Denki Kagaku Kogyo Kabushiki Kaisha Rapidly curable composition for cement and process for producing the same

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