JP3121073B2 - Dust-reducing liquid admixture and method for producing concrete for wet spraying using the same - Google Patents

Dust-reducing liquid admixture and method for producing concrete for wet spraying using the same

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Publication number
JP3121073B2
JP3121073B2 JP03295126A JP29512691A JP3121073B2 JP 3121073 B2 JP3121073 B2 JP 3121073B2 JP 03295126 A JP03295126 A JP 03295126A JP 29512691 A JP29512691 A JP 29512691A JP 3121073 B2 JP3121073 B2 JP 3121073B2
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JP
Japan
Prior art keywords
water
concrete
dust
quick
setting
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
Application number
JP03295126A
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Japanese (ja)
Other versions
JPH05105493A (en
Inventor
智 岡沢
茂美 松尾
勉 山川
紳一郎 中村
和良 早川
直志 徳谷
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.)
Shin Etsu Chemical Co Ltd
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Shin Etsu Chemical Co Ltd
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Priority to JP03295126A priority Critical patent/JP3121073B2/en
Publication of JPH05105493A publication Critical patent/JPH05105493A/en
Application granted granted Critical
Publication of JP3121073B2 publication Critical patent/JP3121073B2/en
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • 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
    • 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
    • C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0075—Anti-dusting agents
    • 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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
    • C04B2111/00172—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite by the wet process

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

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、急結剤を用いる湿式吹
き付け工法に有用な粉塵低減型液状混和剤およびこれを
使用したコンクリートの製造方法、とくにはコンクリー
トの吹き付け施工時における粉塵の抑制、はね返りの減
少による材料の節減、コンクリートの長時間の流動性確
保とその後の短時間での急結、硬化コンクリートの長期
圧縮強度の向上を達成した、液状混和剤とこれを使用し
たコンクリートの製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust reducing liquid admixture useful for a wet spraying method using a quick setting agent and a method for producing concrete using the same. A liquid admixture and a method for producing concrete using it, which achieves material savings by reducing rebound, securing long-term fluidity of concrete and quick setting in a short time thereafter, and improving long-term compressive strength of hardened concrete. It is about.

【０００２】[0002]

【従来技術】コンクリートの吹き付け工法は下記の乾式
工法と湿式工法とに大別され、従来は施工設備上の問
題、急結剤の使用が容易などの理由から乾式工法が多用
されてきたが、最近はコンクリートのＷ／Ｃ（水セメン
ト比）の維持をはじめとする品質および施工管理が容易
なこと、乾式工法に比べて粉塵の発生量が少ないことな
どから湿式工法の割合が増えつつある。2. Description of the Related Art Concrete spraying methods are broadly divided into the following dry methods and wet methods. Conventionally, dry methods have been frequently used due to problems in construction equipment and easy use of quick-setting agents. Recently, the ratio of the wet method is increasing due to the fact that the quality and construction management including the maintenance of the W / C (water-cement ratio) of the concrete are easy, and the amount of generated dust is smaller than the dry method.

【０００３】乾式工法：水以外のすべての材料を空練り
したコンクリートを、吹き付け機により圧送し、吹き付
けノズルの手前で別系統で送られた水と合流させて吹き
付ける工法。[0003] Dry construction method: A construction method in which concrete obtained by kneading all materials other than water is pressure-fed by a spraying machine and joined with water sent from another system before the spraying nozzle to spray it.

【０００４】湿式工法：急結剤を除くすべての材料を混
練したコンクリートを、吹き付け機により圧送し、吹き
付けノズルの手前で急結剤を加えて吹き付ける工法。[0004] Wet method: A method in which concrete kneaded with all the materials except the quick-setting agent is pressure-fed by a spraying machine, and the quick-setting agent is added and sprayed before the spraying nozzle.

【０００５】これらのコンクリートの吹き付け工事では
施工時に発生する粉塵が作業環境上問題となっていて、
コンクリートに遅延剤としてセルロースエーテルを混合
し、次いで急結剤を添加混合して湿式吹き付けを行う方
法（特公昭52-13853号公報）や水溶性セルロースエーテ
ルと減水剤と消泡剤とからなる吹き付け工法用助剤（特
開昭59- 141448号公報）が提案されている。[0005] In these concrete spraying works, dust generated during construction is a problem in the working environment.
A method in which cellulose ether is mixed with concrete as a retarding agent, and then a quick setting agent is added and mixed, followed by wet spraying (Japanese Patent Publication No. 52-13853), or spraying comprising a water-soluble cellulose ether, a water reducing agent and an antifoaming agent A method aid (JP-A-59-141448) has been proposed.

【０００６】しかし、これらの方法はいずれも主成分と
して粉末状の水溶性セルロースエーテルを用いるもので
あるため、粉立ちなど取り扱いが困難なほか、コンクリ
ートに均一に混ざりにくく、とくに添加量がコンクリー
ト中のセメント重量に対し0.05〜 0.5％程度と少量であ
ることから、精度の高い特別な供給装置を必要としてい
た。However, all of these methods use a powdery water-soluble cellulose ether as a main component, so that they are difficult to handle such as powdering, and are difficult to mix uniformly with concrete. Since it is a small amount of about 0.05 to 0.5% of the cement weight, a special high-precision feeding device was required.

【０００７】前述したように、湿式吹き付け工法では短
時間に所定の強度を得るためにノズル口付近で急結剤が
添加されているが、ここでいう急結剤とはJIS A-0203
「コンクリート用語」において「セメントの水和反応を
早め凝結時間を著しく短くするために用いる混和剤」と
定義されているもので、その代表的なものにはアルミン
酸アルカリ、炭酸アルカリまたは両者の混合物などの無
機塩系、セメント鉱物系、カルシウムサルホアルミネー
ト系などが挙げられる。As described above, in the wet spraying method, a quick-setting agent is added near the nozzle orifice in order to obtain a predetermined strength in a short time, but the quick-setting agent referred to here is JIS A-0203.
It is defined in the term "concrete" as "an admixture used to accelerate the hydration reaction of cement and to significantly shorten the setting time." Typical examples are alkali aluminates, alkali carbonates, or a mixture of both. Inorganic salt-based, cement mineral-based, calcium sulfoaluminate-based, and the like.

【０００８】この急結剤はコンクリートの主要原料であ
るセメント、砂、砂利などと比べて高価であり、とくに
湿式工法ではセメント粒子が急結剤に接触する前に水と
接触すること、乾式工法と比べてＷ／Ｃが大きくなるこ
とから一般に急結剤の使用量が多くなる。This quick-setting admixture is more expensive than cement, sand, gravel, etc., which are the main raw materials for concrete. In particular, in the wet method, the cement particles come into contact with water before coming into contact with the quick-setting admixture. In general, the amount of the quick-setting admixture is increased because the ratio of W / C is increased.

【０００９】このためポリカルボン酸塩系混和剤を減水
剤として用いて単位水量を減らし急結剤使用量を低減す
る方法も提案されている（特開平2- 48453号公報）が、
この方法は急結剤の急結効果を改善することはできるが
粉塵を抑制する効果に乏しい。また急結剤を添加した吹
き付けコンクリートには、これを添加しないものと比べ
て初期圧縮強度は大きいが長期圧縮強度が低下するとい
う問題もある。For this reason, a method has been proposed in which a polycarboxylate-based admixture is used as a water reducing agent to reduce the amount of unit water and reduce the amount of quick-setting binder used (JP-A-2-48453).
Although this method can improve the quick setting effect of the quick setting agent, it has a poor effect of suppressing dust. In addition, the shotcrete to which the quick-setting agent is added has a problem that the initial compressive strength is large but the long-term compressive strength is lower than that of the concrete not added.

【００１０】[0010]

【発明が解決しようとする課題】したがって、本発明の
目的は、予め練り混ぜたコンクリートに急結剤を添加し
て施工する湿式吹き付け工法において、コンクリートの
流動性を長時間確保し、粉塵抑制、はね返り率の低減、
急結剤の急結効果の向上および長期圧縮強度の向上等が
達成される粉塵低減型液状混和剤並びにこれを用いたコ
ンクリートの製造方法を提供するものである。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a wet spraying method in which a quick-setting agent is added to premixed concrete to ensure the fluidity of the concrete for a long period of time and to reduce dust. Reduction of rebound rate,
An object of the present invention is to provide a dust-reducing liquid admixture capable of improving the quick-setting effect of a quick-setting agent and improving long-term compressive strength, and a method for producing concrete using the same.

【００１１】[0011]

【課題を解決するための手段】すなわち、本発明による
粉塵低減型液状混和剤は、水溶性セルロースエーテルと
この 0.1〜10倍量の水溶性ポリカルボン酸塩と水とから
なることを特徴とし、これを用いたコンクリートの製造
方法は、予め練り混ぜるコンクリートに対し前記液状混
和剤を固形分換算でセメント重量の0.02〜 1.5重量％添
加することを特徴とするものである。That is, the dust-reducing liquid admixture of the present invention comprises a water-soluble cellulose ether, 0.1 to 10 times the amount of a water-soluble polycarboxylate and water, The method for producing concrete using this method is characterized in that the liquid admixture is added to concrete to be mixed in advance in an amount of 0.02 to 1.5% by weight of cement in terms of solid content.

【００１２】以下、本発明をさらに詳細に説明する。前
述したように、水溶性セルロースエーテルのみを使用し
ても粉塵抑制効果は得られるが、本発明の液状混和剤
は、この水溶性セルロースエーテルにその 0.1〜10倍量
の水溶性ポリカルボン酸塩を併用したことにより、コン
クリートのＷ／Ｃを低減して水に対する水溶性セルロー
スエーテルの濃度を高め、コンクリートの性状をして流
動性を長時間保持しつつより粘ちょうにし、水溶性セル
ロースエーテルを単独で使用する場合よりも半分以下の
量で同等の粉塵抑制効果を得ると共に、粉末状の水溶性
セルロースエーテルではコンクリート中に混合しにくか
ったのを、容易かつ均一に混合できるものとした。Hereinafter, the present invention will be described in more detail. As described above, the dust suppression effect can be obtained by using only the water-soluble cellulose ether. However, the liquid admixture of the present invention contains 0.1 to 10 times as much water-soluble polycarboxylate as the water-soluble cellulose ether. The use of water-soluble cellulose ether reduces the W / C of concrete, increases the concentration of water-soluble cellulose ether with respect to water, and makes the concrete more viscous while maintaining fluidity for a long time. The equivalent dust suppression effect was obtained with an amount less than half that of the case of using alone, and the powdery water-soluble cellulose ether, which was difficult to mix in concrete, can be easily and uniformly mixed.

【００１３】この液状混和剤に用いられる水溶性セルロ
ースエーテルとしては、メチルセルロース、エチルセル
ロースなどのアルキルセルロース；ヒドロキシエチルセ
ルロース、ヒドロキシプロピルセルロースなどのヒドロ
キシアルキルセルロース；ヒドロキシエチルメチルセル
ロース、ヒドロキシプロピルメチルセルロース、ヒドロ
キシエチルエチルセルロースなどのヒドロキシアルキル
アルキルセルロースが挙げられるが、これらの内特に好
ましいのはヒドロキシアルキルセルロースとヒドロキシ
アルキルアルキルセルロースである。Examples of the water-soluble cellulose ether used in the liquid admixture include alkyl cellulose such as methyl cellulose and ethyl cellulose; hydroxyalkyl cellulose such as hydroxyethyl cellulose and hydroxypropyl cellulose; and hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose and hydroxyethyl ethyl cellulose. Hydroxyalkylalkylcellulose is mentioned, and among these, hydroxyalkylcellulose and hydroxyalkylalkylcellulose are particularly preferred.

【００１４】前記液状混和剤の調製に際し、これらの水
溶性セルロースエーテルは粉末のままで添加してもよい
し、ママコを防ぐためにグリオキザールなどを付加した
ものを用いることもできる。また水溶性セルロースエー
テルにはヒドロキシプロピルメチルセルロースのように
空気連行性を有するものがあり、必要に応じてトリブチ
ルフォスフェート、ポリアルキレングリコール誘導体の
ような消泡剤を併用することもできる。In preparing the liquid admixture, these water-soluble cellulose ethers may be added as they are in a powder form or may be added with glyoxal or the like to prevent mamako. Some water-soluble cellulose ethers have air entrainment like hydroxypropylmethylcellulose. If necessary, an antifoaming agent such as tributyl phosphate or a polyalkylene glycol derivative can be used in combination.

【００１５】他方、前記水溶性セルロースエーテルと併
用されるポリカルボン酸塩は、カルボキシル酸基置換ビ
ニルモノマーを１成分として含む共重合体の塩で、水溶
性セルロースエーテルの溶解を抑え、粘性の低いスラリ
ー状の液に保つ働きをする。上記共重合体の具体的な例
としては、水溶性のα，β−不飽和ジカルボン酸とオレ
フィンの共重合体、ポリエチレングリコールモノアリル
エーテルとマレイン酸系単量体およびこれらと共重合可
能な単量体から導かれる共重合体、イソブチレン−スチ
レンマレイン酸系、イソブチレン−アクリル酸エステル
−マレイン酸系、イソブチレン−スチレン−アクリル酸
エステル−マレイン酸系の共重合体などが挙げられる。On the other hand, the polycarboxylate used in combination with the water-soluble cellulose ether is a salt of a copolymer containing a carboxylic acid group-substituted vinyl monomer as one component, which suppresses the dissolution of the water-soluble cellulose ether and has a low viscosity. It works to keep the slurry liquid. Specific examples of the above-mentioned copolymer include a copolymer of a water-soluble α, β-unsaturated dicarboxylic acid and an olefin, a polyethylene glycol monoallyl ether and a maleic acid-based monomer, and a monomer copolymerizable therewith. Copolymers derived from monomers, isobutylene-styrene-maleic acid, isobutylene-acrylate-maleic acid, and isobutylene-styrene-acrylate-maleic acid copolymers.

【００１６】本発明の液状混和剤は水溶性セルロースエ
ーテルとこの 0.1〜10倍量の水溶性ポリカルボン酸塩と
水とからなるものであるが、水溶性ポリカルボン酸塩は
好ましくは水溶性セルロースエーテルの0.25〜５倍量で
使用される。水溶性ポリカルボン酸塩が 0.1倍量未満で
は、水溶性セルロースエーテルが溶解して粘性が高まる
ため多量の水が必要になる。また粘性の高い液状混和剤
を使用すると、均一な練り混ぜが難しくなる。他方、10
倍量を超えるときは水溶性セルロースエーテルが分離、
沈殿して均一な液とならないため品質変動の原因とな
る。The liquid admixture of the present invention comprises a water-soluble cellulose ether, 0.1 to 10 times the amount of a water-soluble polycarboxylate and water, and the water-soluble polycarboxylate is preferably a water-soluble cellulose. Used in 0.25 to 5 times the amount of ether. When the amount of the water-soluble polycarboxylate is less than 0.1 times, a large amount of water is required because the water-soluble cellulose ether is dissolved and the viscosity increases. When a highly viscous liquid admixture is used, uniform mixing becomes difficult. On the other hand, 10
When the amount exceeds twice, the water-soluble cellulose ether separates,
Since it does not precipitate and become a uniform liquid, it causes quality fluctuation.

【００１７】本発明による湿式吹き付け工法用コンクリ
ートの製造に際し、予め練り混ぜたコンクリートに対し
て添加される上記液状混和剤の量は、固形分換算でセメ
ント重量の0.02〜 1.5重量％、好ましくは0.08〜 0.5重
量％である。これが0.02重量％未満では粉塵抑制効果、
減水効果が不充分であり、顕著な相乗効果が発揮されな
い。また 1.5重量％を超えるときは減水効果が頭打ちと
なり、粘性の異常な上昇により吹き付けが困難となる。In the production of the concrete for the wet spraying method according to the present invention, the amount of the liquid admixture added to the previously kneaded concrete is 0.02 to 1.5% by weight, preferably 0.08% by weight of the cement weight in terms of solid content. ~ 0.5% by weight. If this is less than 0.02% by weight, the dust suppression effect,
The water reducing effect is insufficient, and no remarkable synergistic effect is exhibited. When the content exceeds 1.5% by weight, the water reducing effect reaches a peak, and the spraying becomes difficult due to an abnormal increase in viscosity.

【００１８】本発明の方法の一態様として水溶性セルロ
ースエーテルと水溶性ポリカルボン酸塩をコンクリート
中のセメント重量に対する使用量で示せば、固形分換算
で、前者が0.01〜 1.0重量％、好ましくは0.05〜 0.3重
量％、後者が0.01〜 0.5重量％、好ましくは0.03〜 0.2
重量％が適当である。In one embodiment of the method of the present invention, when the water-soluble cellulose ether and the water-soluble polycarboxylate are used in terms of the amount used based on the weight of cement in concrete, the former is 0.01 to 1.0% by weight in terms of solid content, preferably 0.05 to 0.3% by weight, the latter being 0.01 to 0.5% by weight, preferably 0.03 to 0.2%
% By weight is appropriate.

【００１９】前者が0.01重量％未満では粉塵抑制効果が
劣り、 1.0重量％を超えるとコンクリートの粘性が増し
て吹き付けが困難となったりセメントの凝結が遅延した
りするので好ましくない。後者が0.01重量％未満では減
水効果が得られないため所望の急結効果が得られず、
0.5重量％を超えると量の増加ほどには急結効果の向上
が望めず経済的でない。If the former is less than 0.01% by weight, the effect of suppressing dust is inferior, and if it exceeds 1.0% by weight, the viscosity of concrete increases, making spraying difficult and setting of cement unfavorably delayed. If the latter is less than 0.01% by weight, the desired quick-setting effect cannot be obtained because the water reducing effect cannot be obtained,
If it exceeds 0.5% by weight, it is not economical to improve the quick setting effect as much as the amount is increased.

【００２０】なお、通常のコンクリートの製造に用いら
れているリグニンスルホン酸塩とその誘導体、オキシカ
ルボン酸塩、ナフタリンスルホン酸ホルマリン縮合物
塩、メラミンスルホン酸ホルマリン縮合物塩等を主成分
とする減水剤は、水溶性セルロースエーテルと水溶液状
態で混合してコンクリートに使用すると、 １）リグニンスルホン酸塩とその誘導体およびオキシカ
ルボン酸塩では、凝結遅延作用が大きいために急結剤の
急結性を低下させる； ２）ナフタリンスルホン酸ホルマリン縮合物塩では、水
溶液がゲル化して取り扱いが困難になり、コンクリート
の経時的な流動性の低下が極めて大きく、空気量を過大
に連行し、急結剤の急結性を低下させる； ３）メラミンスルホン酸ホルマリン縮合物塩では、流動
性の低下が大きい；などの不利がもたらされるので本発
明には適用できない。In addition, water-reducing water containing lignin sulfonate and its derivatives, oxycarboxylate, naphthalene sulfonate formalin condensate, melamine sulfonate formalin condensate and the like used in the production of ordinary concrete as main components. When the agent is mixed with water-soluble cellulose ether in the form of an aqueous solution and used for concrete, 1) Lignin sulfonate and its derivatives and oxycarboxylates have a large setting delay effect, so that the quick-setting properties of the quick-setting agent are reduced. 2) In the case of the formalin condensate of naphthalenesulfonic acid, the aqueous solution gels, making it difficult to handle, and the fluidity of the concrete decreases significantly with the passage of time. 3) The melamine sulfonic acid formalin condensate greatly reduces the fluidity; Since disadvantage is brought to the present invention can not be applied.

【００２１】本発明の粉塵低減型液状混和剤は水溶性ポ
リカルボン酸塩を使用することにより水溶性セルロース
エーテルを可溶化して一液にすることを可能にし、従来
使用されてきた粉体に比べ取り扱いが容易となり、高価
な供給装置を不要とし、かつコンクリート中に均一に混
合することを可能にした。The dust-reducing liquid admixture of the present invention makes it possible to solubilize a water-soluble cellulose ether into one liquid by using a water-soluble polycarboxylate, and it is used in powders which have been conventionally used. This makes handling easier, eliminates the need for expensive feeding equipment, and enables uniform mixing in concrete.

【００２２】また、本発明の湿式吹き付け工法用コンク
リートの製造方法は、上記粉塵低減型液状混和剤を使用
することにより、その減水効果によりコンクリートの水
セメント比を低減し、コンクリート中の水に対する水溶
性セルロースエーテルの濃度を高め、その結果、コンク
リートの流動性を長時間保持しつつより粘ちょうとし、
水溶性セルロースエーテルおよび水溶性ポリカルボン酸
塩をそれぞれ単独で使用した場合には得られなかった優
れた粉塵抑制効果、はね返り率の低減効果および急結剤
の急結効果を増大させ、しかも長期圧縮強度発現性を改
善するなど、総合的に吹き付けコンクリートの品質を改
善することに成功したものである。In the method for producing concrete for a wet spraying method according to the present invention, by using the above-mentioned dust-reducing liquid admixture, the water-to-cement ratio of the concrete is reduced by the water-reducing effect, and the water-to-water ratio in the concrete is reduced. Increase the concentration of the cellulose ether, which results in more viscous while maintaining the fluidity of the concrete for a long time,
Water-soluble cellulose ethers and water-soluble polycarboxylates, which are not obtained when used alone, have an excellent dust suppression effect, reduce the rebound rate and increase the quick-setting effect of the quick-setting agent. It succeeded in comprehensively improving the quality of shotcrete, including improving the strength development.

【００２３】[0023]

【実施例】以下、本発明の具体的態様を実施例及び比較
例により説明するが、本発明はこれに限定されるもので
はない。 実施例１〜７および比較例１〜７ 湿式吹き付けコンクリートのモデル試験としてコンクリ
ートに表１に示す各成分を練り混ぜ、その直後の温度と
空気量、練り置きによるスランプ（流動性保持）、吹き
付け実験装置による粉塵濃度とはね返り率、急結剤添加
系の凝結（凝結始発時間）および圧縮強度の測定を行
い、その結果を表２に示した。なお、各例において使用
した材料、試験方法などは以下の通りである。EXAMPLES Hereinafter, specific embodiments of the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited thereto. Examples 1 to 7 and Comparative Examples 1 to 7 As a model test of wet sprayed concrete, each component shown in Table 1 was mixed and kneaded with concrete, and the temperature and air amount immediately after mixing, slumping (maintaining fluidity) by kneading, and spraying test were performed. Dust concentration and rebound rate, setting (starting time of setting) and compressive strength of the quick-setting additive-added system were measured by the apparatus, and the results are shown in Table 2. The materials and test methods used in each example are as follows.

【００２４】１）水溶性セルロースエーテル（表中ＷＣ
Ｅと略す）： ａ）ヒドロキシエチルセルロース（表中ＨＥＣと略す） NATROSOL 250 HHR、ハーキュレス社製。 ｂ）ヒドロキシプロピルメチルセルロース（表中ＨＰＭ
Ｃと略す） ２％水溶液の粘度： 30,000cps、信越化学工業社製。1) Water-soluble cellulose ether (WC in the table)
E): a) Hydroxyethylcellulose (abbreviated as HEC in the table) NATROSOL 250 HHR, manufactured by Hercules. b) Hydroxypropyl methylcellulose (HPM in the table)
Viscosity of 2% aqueous solution: 30,000 cps, manufactured by Shin-Etsu Chemical Co., Ltd.

【００２５】２）減水剤： ａ）ポリカルボン酸塩（表中Ａと略す） NT-1000、エヌエムビー社製。 ｂ）リグニンスルホン酸塩（表中Ｂと略す） ポゾリスNo.8、エヌエムビー社製。 ｃ）オキシカルボン酸塩（表中Ｃと略す） グルコン酸ナトリウム、試薬１級。 ｄ）ナフタレンスルホン酸ホルマリン縮合物塩（表中Ｄ
と略す） マイティー 150、花王社製。 ｅ）メラミンスルホン酸ホルマリン縮合物塩（表中Ｅと
略す） レオビルド NL-4000、エヌエムビー社製。2) Water reducing agent: a) Polycarboxylate (abbreviated as A in the table) NT-1000, manufactured by NMB Corporation. b) Lignin sulfonate (abbreviated as B in the table) Pozzolith No. 8, manufactured by NMB. c) Oxycarboxylate (abbreviated as C in the table) Sodium gluconate, reagent primary. d) Naphthalenesulfonic acid formalin condensate salt (D in the table)
Mighty 150, manufactured by Kao Corporation. e) Melamine sulfonic acid formalin condensate salt (abbreviated as E in the table) Leobuild NL-4000, manufactured by NMB Corporation.

【００２６】３）消泡剤： トリブチルフォスフェート（試薬１級）3) Antifoaming agent: tributyl phosphate (first grade reagent)

【００２７】４）コンクリートの配合： 〈プレーンコンクリートの配合〉 Ｗ／Ｃ（水／セメント比）：60％、ｓ／ａ（細骨材率）
56.7％、 粗骨材の最大寸法：20mm。 単位量（基本配合）［kg／ｍ3 ］ 水（水道水）： 210、セメント： 350、細骨材： 918、
粗骨材： 711、 急結剤：セメント×0.06。 なお、減水剤を使用したコンクリートの単位水量は、混
和剤を用いないプレーンコンクリートと同一のスランプ
が得られるように変化させた。4) Mixing of concrete: <mixing of plain concrete> W / C (water / cement ratio): 60%, s / a (fine aggregate ratio)
56.7%, maximum size of coarse aggregate: 20mm. Unit amount (basic composition) [kg / m 3 ] Water (tap water): 210, Cement: 350, Fine aggregate: 918,
Coarse aggregate: 711, Quick setting agent: cement x 0.06. In addition, the unit water amount of the concrete using the water reducing agent was changed so that the same slump as that of the plain concrete not using the admixture was obtained.

【００２８】５）コンクリートの材料： ａ）セメント：普通ポルトランドセメント（日本、小野
田、三菱各セメント社製のものを等量づつ混合して使
用） ｂ）細骨材 ：最大粒径５mmの砂、新井市下濁川産、吸
水率2.29％、比重2.57粗粒率2.81。 ｃ）粗骨材 ：最大粒径20mmの砕石、新井市下濁川産、
吸水率2.05％、比重2.61、粗粒率6.62。 ｄ）急結剤 ： QP-55（エヌエムビー社製）5) Material of concrete: a) Cement: Ordinary Portland cement (used by mixing equal parts from Japan, Onoda and Mitsubishi Cement Co.) b) Fine aggregate: sand having a maximum particle size of 5 mm, Arai City Shimogakugawa product, water absorption 2.29%, specific gravity 2.57 coarse grain ratio 2.81. c) Coarse aggregate: crushed stone with a maximum particle size of 20 mm, from Shimogakugawa, Arai City,
Water absorption 2.05%, specific gravity 2.61, coarse grain ratio 6.62. d) Accelerator: QP-55 (NMB)

【００２９】６）空気量の測定：JIS A 1128に準ずる。6) Measurement of air volume: According to JIS A 1128.

【００３０】７）スランプの測定：練り置きしたコンク
リートについて、30分、60分後にJIS A-1101に準じてス
ランプの測定を行った。7) Slump measurement: The slump was measured on the concrete after mixing for 30 minutes and 60 minutes according to JIS A-1101.

【００３１】８）粉塵濃度およびはね返り率の測定： ・吹き付け実験装置：実験は高さ2.5m、幅3.5m、奥行き
5.0mの蒲鉾型の模擬トンネルを用いて下記の条件で行っ
た。 吹き付け機：リードガン（プライブリコ社製） ミキサー：傾胴式、容量 200リットル 吹き付け圧力： 2.5〜3.0kg/cm2 吹き付け場所：トンネルの入口から４ｍの、壁面から１
ｍ離れた場所より斜め上方の壁面に向けて行う。8) Measurement of Dust Concentration and Rebound Rate: Spraying test equipment: The test was 2.5 m in height, 3.5 m in width, and depth
The test was performed under the following conditions using a 5.0 m mock-up type tunnel. Spraying machine: Lead gun (Priv Brico) Mixer: Tilt-type, 200 liter capacity Spraying pressure: 2.5-3.0kg / cm 2 Spraying place: 4m from tunnel entrance, 1 from wall
m from a place m away from the wall.

【００３２】・粉塵濃度の測定：吹き付け開始後、トン
ネルの出入り口を塞ぎ、トンネルの入口から１ｍ（吹き
付け場所から３ｍ）の、左右両側壁より１ｍ離れた場所
（各１ヶ所、相互の距離 1.5ｍ）で、粉塵濃度計（柴田
科学機械工業社製）により30秒毎に測定し吹き付け開始
から３分後の値を粉塵濃度（カウント／分）とした。 ・はね返り率の測定：吹き付け場所の下にビニールシー
トを敷き、はね返り量を計量し、全吹き付け量との比率
をはね返り率とした。Measurement of dust concentration: After the start of spraying, block the entrance and exit of the tunnel, and place 1 m from the entrance of the tunnel (3 m from the spraying location) and 1 m away from the left and right side walls (one each, 1.5 m from each other) ), The value was measured every 30 seconds by a dust concentration meter (manufactured by Shibata Scientific Machinery Co., Ltd.), and the value after 3 minutes from the start of spraying was defined as the dust concentration (count / min).・ Measurement of the rebound rate: A vinyl sheet was laid under the spraying place, the rebound amount was measured, and the ratio to the total spray amount was defined as the rebound rate.

【００３３】９）凝結始発時間の測定：４）項記載の配
合から急結剤を除いたコンクリートをウェットスクリー
ニング（篩目が５mmの篩を用い、モルタル部分と粗骨材
部分とを篩分けること）によりモルタルを分離し、得ら
れたモルタルを30分間練り置き、これに急結剤を後から
添加して20秒間手練りする。このものにつきJIS A-6204
のコンクリートの凝結時間試験方法に準じて凝結の始発
時間（貫入抵抗が35kgf/cm2)を測定した。なお、凝結時
間は急結剤を添加してからの時間（分−秒）である。9) Measurement of setting start time: wet screening of concrete obtained by removing the quick setting agent from the composition described in 4) (screening the mortar portion and the coarse aggregate portion using a sieve having a sieve of 5 mm) ) To separate the mortar, knead the obtained mortar for 30 minutes, add the quick-setting agent to it later and knead it for 20 seconds. JIS A-6204 for this
The starting time of setting (penetration resistance was 35 kgf / cm 2 ) was measured according to the setting method of concrete setting time. The setting time is the time (minute-second) since the addition of the quick setting agent.

【００３４】10）圧縮強度試験：JIS A-1108による。な
お、試験の材令は７日と28日である。10) Compressive strength test: According to JIS A-1108. The age of the test is 7 days and 28 days.

【００３５】[0035]

【表１】 [Table 1]

【００３６】[0036]

【表２】 [Table 2]

【００３７】表２より、各実施例は水溶性セルロースエ
ーテルと減水剤を使用していない比較例１と比べて、 １）粉塵濃度を22〜64％にまで抑制し、 ２）はね返り率を60〜83％まで低減することができ、 ３）凝結時間を約１分30秒以上短縮して急結効果を向上
させ、 ４）材令７日の圧縮強度を14〜51％、材令28日の圧縮強
度を７〜42％増加させ、 ５）練り混ぜてから60分経過した後のスランプの低下量
が（比較例１の6.5cmに対し） 3.6〜 2.6と小さく、 ６）消泡剤の使用量も僅かですんで、過大に空気を連行
することがない、などの利点がある。From Table 2, it can be seen that in each Example, 1) the dust concentration was suppressed to 22 to 64% and 2) the rebound rate was 60%, as compared with Comparative Example 1 in which no water-soluble cellulose ether and water reducing agent were used. 3) The setting time is reduced by about 1 minute 30 seconds or more to improve the quick setting effect. 4) The compressive strength of 7 days old is 14-51%, 28 days old. 5) The amount of decrease in the slump after 60 minutes from mixing is reduced to 3.6 to 2.6 (compared to 6.5 cm in Comparative Example 1), and 6) the defoamer The use amount is small, and there is an advantage that the air is not entrained excessively.

【００３８】比較例２は減水剤を添加しない場合である
が、各実施例と比べて粉塵抑制効果が十分でなく、流動
性保持、急結性および長期圧縮強度発現性等の効果が劣
る。比較例３は水溶性セルロースエーテルを添加しない
場合であるが、各実施例と比べて粉塵抑制効果が劣り、
はね返り率の低減効果も十分でない。Comparative Example 2 was a case where no water reducing agent was added, but the effect of suppressing dust was not sufficient, and the effects such as fluidity retention, quick-setting property and long-term compressive strength were inferior to those of Examples. Comparative Example 3 was a case where no water-soluble cellulose ether was added, but the dust suppressing effect was inferior to each of the examples,
The effect of reducing the rebound rate is not sufficient.

【００３９】比較例４〜７は減水剤の種類を変えた場合
であるが、とりわけ比較例５〜６では粉塵抑制効果の相
乗効果がなく、はね返り率の低減効果も劣る。比較例４
は粉塵抑制効果はよいが、はね返り率の低減効果が劣
る。比較例６および７は流動性保持効果が極めて低く急
結効果にも劣り実用的でない。とくに比較例６は水溶性
セルロースエーテルとゲルを形成し空気量を過大に連行
するため、これを減らすための消泡剤量が多くなる。In Comparative Examples 4 to 7, the type of the water reducing agent was changed. Particularly, in Comparative Examples 5 to 6, there was no synergistic effect of the dust suppressing effect, and the effect of reducing the rebound rate was poor. Comparative Example 4
Has a good dust suppression effect, but is inferior in the effect of reducing the rebound rate. Comparative Examples 6 and 7 have an extremely low fluidity retention effect and are inferior to the quick setting effect, and are not practical. In particular, Comparative Example 6 forms a gel with the water-soluble cellulose ether and entrains too much air, so that the amount of the antifoaming agent for reducing this is increased.

【００４０】すなわち、各実施例と比較例２および３と
の比較より、水溶性セルロースエーテルと水溶性ポリカ
ルボン酸塩の単独使用では得られなかった粉塵抑制効果
やはね返り率の低減効果が水溶性セルロースエーテルと
水溶性ポリカルボン酸塩との併用で得られること、また
比較例４〜７と比べて、急結効果、長期圧縮強度発現
性、流動性保持効果、空気連行性などが総合的に改善さ
れることが確認された。That is, from the comparison between each example and Comparative Examples 2 and 3, it was found that the water-soluble cellulose ether and the water-soluble polycarboxylate alone did not have the effect of suppressing dust and the effect of reducing the rebound rate. It can be obtained by using a combination of a cellulose ether and a water-soluble polycarboxylate. Also, compared with Comparative Examples 4 to 7, the quick setting effect, long-term compressive strength, fluidity retention effect, air entrainment, and the like are comprehensive. It was confirmed to be improved.

【００４１】[0041]

【発明の効果】本発明の粉塵低減型液状混和剤は水溶性
セルロースエーテルと水溶性ポリカルボン酸塩とを一液
化したことにより、従来粉体で使用されていたものに比
べて取扱いを容易とし、高価な供給装置を必要としない
ため経済性を向上させ、コンクリートへの均一な混合に
より均質なコンクリートの製造を可能にする。The dust-reducing liquid admixture of the present invention has been made easier to handle as compared with those conventionally used in powders, because the water-soluble cellulose ether and the water-soluble polycarboxylate are made into one liquid. In addition, the present invention does not require an expensive supply device, thereby improving the economic efficiency, and enables uniform production of concrete by uniform mixing with concrete.

【００４２】本発明の湿式吹き付け工法用コンクリート
の製造方法は上記液状混和剤を使用したことにより、コ
ンクリートの流動性を長時間保持し、優れた粉塵抑制効
果により作業環境を向上し、はね返り率の低減による材
料の損失抑制と急結剤の急結性の向上に伴う添加量の節
減とによって経済性を向上させ、長期圧縮強度の改善に
よりコンクリートの耐久性を向上させることができる。The method for producing concrete for the wet spraying method according to the present invention uses the above-mentioned liquid admixture to maintain the fluidity of concrete for a long time, to improve the working environment by an excellent dust suppressing effect, and to improve the rebound rate. It is possible to improve the economic efficiency by suppressing the loss of the material by the reduction and the addition amount by the improvement of the quick setting property of the quick setting agent, and to improve the durability of the concrete by improving the long-term compressive strength.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 山川 勉 新潟県中頸城郡頸城村大字西福島28番地 の１ 信越化学工業株式会社 合成技術 研究所内 (72)発明者 中村 紳一郎 新潟県中頸城郡頸城村大字西福島28番地 の１ 信越化学工業株式会社 合成技術 研究所内 (72)発明者 早川 和良 東京都千代田区大手町二丁目６番１号 信越化学工業株式会社 本社内 (72)発明者 徳谷 直志 東京都千代田区大手町二丁目６番１号 信越化学工業株式会社 本社内 (56)参考文献 特開 昭63−270334（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 24/38 C04B 24/26 C04B 28/04 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tsutomu Yamakawa 28-1, Nishifukushima, Nishigusuku-mura, Nakakushiro-gun, Niigata Pref. 28, Nishifukushima, Mura Dai-no-Shin Shin-Etsu Chemical Co., Ltd., Synthetic Technology Laboratory (72) Inventor Kazuyoshi Hayakawa 2-6-1 Otemachi, Chiyoda-ku, Tokyo Shin-Etsu Chemical Co., Ltd. Head Office (72) Inventor Tokuya Naoshi 2-6-1 Otemachi, Chiyoda-ku, Tokyo Shin-Etsu Chemical Co., Ltd. Head Office (56) References JP-A-63-270334 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB Name) C04B 24/38 C04B 24/26 C04B 28/04

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】水溶性セルロースエーテルとこの 0.1〜10
倍量の水溶性ポリカルボン酸塩と水とからなる粉塵低減
型液状混和剤。1. A water-soluble cellulose ether and 0.1 to 10
A dust-reducing liquid admixture consisting of twice as much water-soluble polycarboxylate and water. 【請求項２】予め練り混ぜたコンクリートに急結剤を添
加して施工する湿式吹き付け工法において、前記コンク
リートに対し請求項１記載の粉塵低減型液状混和剤を固
形分換算でセメント重量の0.02〜 1.5重量％添加するこ
とを特徴とする湿式吹き付け工法用コンクリートの製造
方法。2. A wet spraying method in which a quick-setting agent is added to concrete previously kneaded and mixed, wherein the dust-reducing liquid admixture according to claim 1 is added to said concrete in an amount of 0.02 to cement weight in terms of solid content. A method for producing concrete for wet spraying, comprising adding 1.5% by weight.
JP03295126A 1991-10-15 1991-10-15 Dust-reducing liquid admixture and method for producing concrete for wet spraying using the same Expired - Lifetime JP3121073B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03295126A JP3121073B2 (en) 1991-10-15 1991-10-15 Dust-reducing liquid admixture and method for producing concrete for wet spraying using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP03295126A JP3121073B2 (en) 1991-10-15 1991-10-15 Dust-reducing liquid admixture and method for producing concrete for wet spraying using the same

Publications (2)

Publication Number Publication Date
JPH05105493A JPH05105493A (en) 1993-04-27
JP3121073B2 true JP3121073B2 (en) 2000-12-25

Family

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT406156B (en) * 1996-08-13 2000-03-27 Tulln Zuckerforschung Gmbh ADDITIVES FOR SPRAY CONCRETE
CA2460517A1 (en) * 2001-09-14 2003-03-27 Satoshi Okazawa Additive for cement composition and cement composition containing the same
JP4514145B2 (en) * 2005-05-26 2010-07-28 電気化学工業株式会社 Spraying material and spraying method using the same
KR102453138B1 (en) * 2020-07-24 2022-10-07 서울대학교산학협력단 Method for producing polycarboxylates using lignin, polycarboxylate prepared thereby and concrete admixture containing the prepared polycarboxylate

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JPH05105493A (en) 1993-04-27

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