JP2003292359A - Dust reduction agent - Google Patents
Dust reduction agentInfo
- Publication number
- JP2003292359A JP2003292359A JP2002095991A JP2002095991A JP2003292359A JP 2003292359 A JP2003292359 A JP 2003292359A JP 2002095991 A JP2002095991 A JP 2002095991A JP 2002095991 A JP2002095991 A JP 2002095991A JP 2003292359 A JP2003292359 A JP 2003292359A
- Authority
- JP
- Japan
- Prior art keywords
- reducing agent
- mortar
- dust
- dust reducing
- agent
- 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
Landscapes
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、粉末急結剤を用い
る湿式吹付け工法に有用な粉塵低減剤及びこれを使用し
たセメント混和剤、モルタル及びモルタル吹付け工法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust reducing agent useful for a wet spraying method using a powder quick-setting agent, a cement admixture using the same, a mortar and a mortar spraying method.
【０００２】[0002]
【従来の技術】モルタルの吹付け工事では、施工時に発
生する粉塵が作業環境上問題となっており、モルタルに
増粘性を付与する粉塵低減剤を混合し、これに急結剤を
添加・混合して湿式吹付け工法を行うことが提案されて
いる。従来市販されている粉塵低減剤は、メチルセルロ
ース等の高分子化合物であり、一般に、これをモルタル
混練時又は予め練り混ぜたモルタルに添加・混合し、こ
れと急結剤を混合して吹付ける方法により、用いられて
いる。また、急結剤と粉塵低減剤とを予め混合し、吹付
けノズル近傍のＹ字管においてモルタルと混合して吹付
ける方法も提案されている。2. Description of the Related Art In mortar spraying work, dust generated during construction has become a problem in the working environment. Therefore, a dust reducing agent that imparts a thickening property to mortar is mixed, and a quick-setting agent is added and mixed. It has been proposed to carry out a wet spraying method. Dust reducing agents that have hitherto been commercially available are high molecular compounds such as methylcellulose, and generally, a method of adding and mixing this during mortar kneading or to mortar that has been kneaded in advance, and mixing this with a quick-setting agent and spraying. It is used by A method has also been proposed in which a quick-setting agent and a dust reducing agent are mixed in advance and mixed with mortar in a Y-tube near a spray nozzle and sprayed.
【０００３】しかしながら、従来用いられているメチル
セルロース系の粉塵低減剤では、特に急結剤と粉塵低減
剤とを予め混合し、吹付けノズル近傍のＹ字管において
モルタルと混合して吹付ける方法に用いる場合、十分に
粉塵を低減することができなかった。However, in the conventionally used methylcellulose-based dust reducing agent, in particular, a method in which a quick-setting agent and a dust reducing agent are mixed in advance and mixed with mortar in a Y-shaped tube in the vicinity of the spraying nozzle and sprayed. When used, dust could not be reduced sufficiently.
【０００４】[0004]
【発明が解決しようとする課題】従って、本発明の目的
は、粉末急結剤を用いる湿式吹付け工法に有用な粉塵低
減剤及びこれを使用したセメント混和剤、モルタル及び
モルタル吹付け工法を提供することにある。Therefore, an object of the present invention is to provide a dust reducing agent useful for a wet spraying method using a powder quick-setting agent, and a cement admixture, a mortar and a mortar spraying method using the dust reducing agent. To do.
【０００５】[0005]
【課題を解決するための手段】かかる実情において、本
発明者らは鋭意研究を行なった結果、ポリ（メタ）アク
リレート４級化物を粉塵低減剤として用いれば、少ない
添加量で粉塵を十分に低減することができ、粉末急結剤
を用いる湿式吹付け工法に有用であることを見出し、本
発明を完成した。Under such circumstances, as a result of intensive studies by the present inventors, if a poly (meth) acrylate quaternary compound is used as a dust reducing agent, the dust can be sufficiently reduced with a small addition amount. The present invention has been completed, and it was found that it is useful for a wet spraying method using a powder quick-setting agent.
【０００６】すなわち、本発明は、ポリ（メタ）アクリ
レート４級化物からなる粉塵低減剤、及びこれを含有す
るセメント混和剤を提供するものである。また、本発明
は、前記粉塵低減剤、セメント、細骨材及び水を含有す
るモルタルを提供するものである。That is, the present invention provides a dust reducing agent comprising a quaternary poly (meth) acrylate and a cement admixture containing the same. The present invention also provides a mortar containing the dust reducing agent, cement, fine aggregate and water.
【０００７】また、本発明は、前記粉塵低減剤、セメン
ト、細骨材及び水を含有するモルタルを圧送し、別経路
から急結剤を圧送し、合流混合部で混合した後、吹き付
けることを特徴とするモルタル吹付け工法を提供するも
のである。また、本発明は、セメント、細骨材及び水を
含有するモルタルを圧送し、別経路から前記粉塵低減剤
及び急結剤を圧送し、合流混合部で混合した後、吹き付
けることを特徴とするモルタル吹付け工法を提供するも
のである。In the present invention, the mortar containing the dust reducing agent, cement, fine aggregate and water is pressure-fed, the quick-setting agent is pressure-fed from another route, mixed in the confluent mixing section, and then sprayed. The characteristic mortar spraying method is provided. Further, the present invention is characterized in that mortar containing cement, fine aggregate and water is pressure-fed, the dust reducing agent and the quick-setting agent are pressure-fed from another route, and the mixture is mixed in a confluent mixing section and then sprayed. The mortar spraying method is provided.
【０００８】[0008]
【発明の実施の形態】本発明の粉塵低減剤は、ポリ（メ
タ）アクリレート４級化物からなるものである。特に、
（メタ）アクリレート４級化物を重合させたポリマー、
更に（メタ）アクリレート４級化物のホモポリマーが好
ましい。（メタ）アクリレート４級化物としては、次式
（１）BEST MODE FOR CARRYING OUT THE INVENTION The dust reducing agent of the present invention comprises a quaternary poly (meth) acrylate. In particular,
A polymer obtained by polymerizing a quaternary (meth) acrylate,
Further, a homopolymer of quaternary (meth) acrylate is preferable. The quaternary (meth) acrylate has the following formula (1)
【０００９】[0009]
【化１】 [Chemical 1]
【００１０】（式中、Ｒ1は水素原子又はメチル基を示
し、Ｒ2、Ｒ3及びＲ4は同一又は異なって、水素原子又
はアルキル基を示し、ｎは１〜１２の数を示し、Ｘ-は
アニオン残基を示す）で表わされるものが挙げられる。(Wherein R 1 represents a hydrogen atom or a methyl group, R 2 , R 3 and R 4 are the same or different and represent a hydrogen atom or an alkyl group, and n represents a number of 1 to 12, X − represents an anion residue).
【００１１】ここで、Ｒ2、Ｒ3及びＲ4としては、水素
原子又は炭素数１〜６のアルキル基、特に水素原子又は
メチル基が好ましく、更にＲ2、Ｒ3及びＲ4が全てアル
キル基であるのが好ましい。ｎは２〜６が好ましく、特
に２が好ましい。また、Ｘ-としては、塩素イオン、臭
素イオン等のハロゲンイオンや、硝酸イオン、硫酸イオ
ン、リン酸イオンなどが挙げられる。Here, as R 2 , R 3 and R 4 , a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, particularly a hydrogen atom or a methyl group is preferable, and R 2 , R 3 and R 4 are all alkyl. It is preferably a group. 2-6 are preferable and, as for n, 2 is especially preferable. Examples of X − include halogen ions such as chlorine ions and bromine ions, nitrate ions, sulfate ions, and phosphate ions.
【００１２】本発明の粉塵低減剤は、保水量が自重の９
倍以上、特に１０倍以上であるのが、粉塵の発生をより
低減できるので好ましい。ここで、保水量とは、粉塵低
減剤に十分な水を加えたときに、直ちに保持される水の
量で、例えば粉塵低減剤を濾紙の上に載せ、粉塵低減剤
質量の５００重量倍の水をかけた後、吸引濾過したとき
に保持される水の量から、次式により求めた値である。The dust reducing agent of the present invention has a water retention capacity of 9
It is preferably at least twice, especially at least 10 times, since the generation of dust can be further reduced. Here, the water retention amount is the amount of water that is immediately retained when sufficient water is added to the dust reducing agent. For example, the dust reducing agent is placed on the filter paper, and the amount of the dust reducing agent is 500 times the weight of the dust reducing agent. It is a value calculated by the following formula from the amount of water retained when suction filtration is performed after sprinkling water.
【００１３】 （数１） 保水量 ＝（濾過後の粉塵低減剤の質量）−（濾過前の粉塵低減剤の質量）[0013] (Equation 1) Water retention amount = (mass of dust reducing agent after filtration)-(mass of dust reducing agent before filtration)
【００１４】このような保水量は、粉塵低減剤を粉砕し
たり、ポリマー分子中の親水基を増やしたものを用いる
ことなどにより、調整することができる。Such a water retention amount can be adjusted by pulverizing a dust reducing agent or by using one having an increased number of hydrophilic groups in the polymer molecule.
【００１５】本発明の粉塵低減剤は、セメント混和剤に
配合して用いることができる。セメント混和剤には、当
該粉塵低減剤のほか、減水剤や高性能ＡＥ減水剤等の分
散剤、収縮低減剤、急結材を含む急硬材や遅延剤等の凝
結時間調整剤、ゲルタイム調整剤、膨張材（剤）、防錆
剤、防凍剤、着色材、水和熱抑制剤、増粘剤、保水剤、
収縮低減剤、防水剤、発泡剤、起泡剤、消泡剤、アルカ
リ骨材反応抑制剤、フィラー、有機繊維や鋼繊維等の繊
維（ファイバー）、シリカヒューム、スラグ、石膏等の
混和剤や混和材などを、１種又は２種以上含有させるこ
とができる。The dust reducing agent of the present invention can be used by blending it with a cement admixture. Cement admixtures include, in addition to the dust reducer, dispersants such as water reducing agents and high-performance AE water reducing agents, shrinkage reducing agents, setting time adjusting agents such as quick hardening materials and retarding agents including quick setting materials, gel time adjustment. Agent, expansion agent (agent), rust preventive agent, antifreeze agent, coloring agent, heat of hydration inhibitor, thickener, water retention agent,
Shrinkage reducer, waterproofing agent, foaming agent, foaming agent, defoaming agent, alkali-aggregate reaction inhibitor, filler, fiber such as organic fiber or steel fiber, silica fume, slag, plaster etc. One kind or two or more kinds of admixtures can be contained.
【００１６】特に、減水剤及び／又は急結剤を含有する
セメント混和剤は、モルタルの圧送性改善、装置の簡略
化の点で好ましい。減水剤（ＡＥ減水剤、流動化剤、高
性能減水剤及び高性能ＡＥ減水剤を含む）としては、例
えばリグニンスルホン酸塩、グルコン酸塩等のヒドロキ
シ酸塩、多糖類（ポリオール複合体）、ポリオキシエチ
レンアルキルアリールエーテルやナフタレンスルホン酸
塩のホルマリン縮合物等のアルキルアリールスルホン酸
塩、メラミンスルホン酸塩のホルマリン縮合物、芳香族
アミノスルホン酸ポリマー、オレフィン／マレイン酸共
重合体塩や（メタ）アクリル酸／（メタ）アクリル酸エ
ステル共重合体塩等のポリカルボン酸塩系高分子化合物
などが挙げられ、これらは２種以上を組合わせて用いる
こともできる。急結剤としては、例えばアルミン酸ナト
リウム、炭酸ナトリウム、珪酸ナトリウム、硫酸アルミ
ニウム等の無機塩系急結剤、カルシウムアルミネート系
急結剤、カルシウムナトリウムアルミネート系急結剤、
カルシウムサルホアルミネート系急結剤等のセメント鉱
物系急結剤、仮焼明礬石等の天然鉱物系急結剤、グリセ
リン、トリエタノールアミン等の有機質系急結剤などが
挙げられ、これらは２種以上を組合わせて用いることも
できる。In particular, a cement admixture containing a water-reducing agent and / or a quick-setting agent is preferable from the viewpoints of improving the mortar pressure feeding property and simplifying the apparatus. Examples of the water-reducing agent (including AE water-reducing agent, superplasticizer, high-performance water-reducing agent and high-performance AE water-reducing agent) include, for example, lignin sulfonates, hydroxy acid salts such as gluconates, polysaccharides (polyol complex), Alkylaryl sulfonates such as polyoxyethylene alkylaryl ethers and formalin condensates of naphthalene sulfonates, formalin condensates of melamine sulfonates, aromatic amino sulfonic acid polymers, olefin / maleic acid copolymer salts and (meth ) Polycarboxylic acid salt-based polymer compounds such as acrylic acid / (meth) acrylic acid ester copolymer salt and the like can be mentioned, and these can be used in combination of two or more kinds. As the quick-setting agent, for example, sodium aluminate, sodium carbonate, sodium silicate, inorganic salt-based quick-setting agent such as aluminum sulfate, calcium aluminate-based quick-setting agent, calcium sodium aluminate-based quick-setting agent,
Examples include cement mineral-based quick-setting agents such as calcium sulphoaluminate-based quick-setting agents, natural mineral-based quick-setting agents such as calcined alunite, and organic-based quick-setting agents such as glycerin and triethanolamine. It is also possible to use a combination of two or more species.
【００１７】本発明の粉塵低減剤、セメント混和剤は、
可溶性容器に充填し、モルタルの練り混ぜ時や練り混ぜ
後に容器ごと添加して使用することもできる。これによ
り、モルタル等に対する添加量が少ない場合でも、手間
がかからず確実に添加することができる。ここで用いら
れる可溶性容器としては、水溶性高分子からなるか、又
は水溶性高分子に繊維等の不溶性高分子や無機物質等を
添加したフィルム、布、板等からなる、袋状、箱状等の
容器などが挙げられる。これらの容器は、充填した粉塵
低減剤やセメント混和剤を、モルタルに添加できれば、
水に不完全に溶解するものでもよいが、特に、水に完全
に溶解するものが好ましい。The dust reducing agent and cement admixture of the present invention are
It is also possible to fill a soluble container and add the whole container during or after kneading the mortar for use. As a result, even if the addition amount to the mortar or the like is small, it is possible to surely add it without any trouble. The soluble container used here is made of a water-soluble polymer, or is made of a film, cloth, plate, or the like in which an insoluble polymer such as fiber or an inorganic substance is added to the water-soluble polymer, bag-like, box-like And the like. For these containers, if the filled dust reducer and cement admixture can be added to the mortar,
Although it may be insoluble in water, it is particularly preferably insoluble in water.
【００１８】本発明のモルタルは、本発明の粉塵低減
剤、セメント、細骨材及び水を含有するものであり、本
発明のモルタルには、更に、粗骨材を含有するコンクリ
ートも含まれる。粉塵低減剤を配合する場合には、これ
を含有するセメント混和剤として配合することもでき
る。The mortar of the present invention contains the dust reducing agent of the present invention, cement, fine aggregate and water. The mortar of the present invention further includes concrete containing coarse aggregate. When the dust reducing agent is blended, it can be blended as a cement admixture containing it.
【００１９】本発明の粉塵低減剤は、湿式吹付け工法に
有用であり、例えば粉塵低減剤、セメント、細骨材及び
水を含有するモルタルを圧送し、別経路から急結剤を圧
送し、合流混合部で混合した後、吹き付けるモルタル吹
付け工法に用いることができる。この場合、本発明の粉
塵低減剤はモルタルに添加して使用されるが、その添加
量は、セメント１００重量部に対して０．００１〜５重
量部、特に０．００２〜２重量部、更に０．００２〜
０．５重量部であるのが好ましい。この範囲内であれ
ば、十分な粉塵低減効果が得られ、モルタルやコンクリ
ートの吹き付けも容易であり、長期強度が増進されるの
で好ましい。なお、粉塵低減剤の添加時期は特に制限さ
れず、プラント混練時、アジテータ車等のいずれにおい
て添加しても良い。The dust reducing agent of the present invention is useful for a wet spraying method, and for example, mortar containing a dust reducing agent, cement, fine aggregate and water is pressure-fed, and a quick-setting agent is pressure-fed from another route, It can be used in a mortar spraying method of spraying after mixing in the confluent mixing section. In this case, the dust reducing agent of the present invention is used by adding it to mortar, and the addition amount thereof is 0.001 to 5 parts by weight, particularly 0.002 to 2 parts by weight, relative to 100 parts by weight of cement, and further, 0.002-
It is preferably 0.5 part by weight. Within this range, a sufficient dust reduction effect can be obtained, spraying of mortar and concrete is easy, and long-term strength is improved, which is preferable. The timing for adding the dust reducing agent is not particularly limited, and may be added during kneading in the plant or in any of an agitator vehicle and the like.
【００２０】また、本発明の粉塵低減剤は、セメント、
細骨材及び水を含有するモルタルを圧送し、別経路から
粉塵低減剤及び急結剤を圧送し、合流混合部で混合した
後、吹き付けるモルタル吹付け工法に用いることもでき
る。この場合には、本発明の粉塵低減剤は急結剤に添加
して使用されるが、その添加量は、急結剤１００重量部
に対して０．０２〜２０重量部、特に０．０５〜１０重
量部であるのが好ましい。この範囲内であれば、十分な
粉塵低減効果が得られ、モルタルやコンクリートの吹き
付けも容易であり、長期強度が増進されるので好まし
い。Further, the dust reducing agent of the present invention is a cement,
It is also possible to use in a mortar spraying method in which mortar containing fine aggregate and water is pressure-fed, a dust reducing agent and a quick-setting agent are pressure-fed from another route, mixed in a confluent mixing section, and then sprayed. In this case, the dust reducing agent of the present invention is used by adding it to the quick-setting admixture, and the addition amount is 0.02 to 20 parts by weight, especially 0.05 It is preferably from 10 to 10 parts by weight. Within this range, a sufficient dust reduction effect can be obtained, spraying of mortar and concrete is easy, and long-term strength is improved, which is preferable.
【００２１】なお、何れの工法の場合にも、合流混合部
としては、別経路（圧送管）で圧送されてくるモルタル
と急結剤を合流させて混合するものであれば良く、簡便
さや経済性の点で、Ｙ字管を用いるのが好ましい。In any of the construction methods, the merging / mixing section may be any one as long as it mixes the mortar and the quick-setting agent, which are pressure-fed by another route (pressure-feeding pipe), by merging and mixing them. From the standpoint of sex, it is preferable to use a Y-shaped tube.
【００２２】[0022]
【実施例】次に、実施例を挙げて本発明を更に詳細に説
明するが、本発明はこれらにより何ら制限されるもので
はない。なお、実施例で用いた粉塵低減剤Ａ〜Ｃは以下
のとおりである。
（粉塵低減剤Ａ）市販のメチルセルロース系粉塵低減
剤、（粉塵低減剤Ｂ）次式（２）で表わされるメタクリ
レート４級化物のホモポリマー、分子量８００万、EXAMPLES Next, the present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto. The dust reducing agents A to C used in the examples are as follows. (Dust reducing agent A) Commercially available methylcellulose-based dust reducing agent, (Dust reducing agent B) Homopolymer of quaternary methacrylate represented by the following formula (2), molecular weight 8,000,000,
【００２３】[0023]
【化２】 [Chemical 2]
【００２４】（粉塵低減剤Ｃ）粉塵低減剤Ｂを、ジエチ
レングリコールを粉砕助剤として、振動ミルで３０秒間
粉砕したもの。(Dust reducing agent C) Dust reducing agent B is pulverized with a vibration mill for 30 seconds using diethylene glycol as a pulverizing aid.
【００２５】また、各粉塵低減剤の保水量及び９０μｍ
残留率は、表１に示すとおりである。なお、保水量は、
濾紙上の粉塵低減剤０．２ｇに水１００ｇをかけ、吸引
濾過した後の粉塵低減剤の質量から求めた。Further, the water retention amount of each dust reducing agent and 90 μm
The residual rate is as shown in Table 1. The water retention capacity is
It was determined from the mass of the dust reducing agent after suction filtration of 0.2 g of the dust reducing agent on the filter paper and 100 g of water.
【００２６】[0026]
【表１】 [Table 1]
【００２７】実施例１〜６
普通セメント３６０kg／m3、粗骨材７２９kg／m3、細骨
材１０４５kg／m3、及び水２１６kg／m3を各材料の単位
量とし、セメント１００重量部に対して、表２に示す粉
塵低減剤を添加して、吹き付け用コンクリートとした。
これを、スギウエエンジニアリング社製のコンクリート
圧送機「スイングエース」を用いて圧送した。途中で設
けたＹ字管の一方より、セメント鉱物系粉末急結剤（太
平洋マテリアル社製「ショットマスター」）を、太平洋
マテリアル社製の急結剤添加装置「Ｔクリート」で圧送
し、セメント１００重量部に対して７重量部を、合流混
合部で混合して急結性吹付けコンクリートを調製した。
この急結性吹付けコンクリートを１２m3／ｈの吹付け速
度で２０分間、高さ８ｍ、幅１０ｍの模擬トンネルに吹
付けし、粉塵量と圧縮強度を測定した。結果を表２に併
せて示す。[0027] Examples 1-6 ordinary cement 360 kg / m 3, coarse aggregate 729kg / m 3, fine aggregates 1045 kg / m 3, and water 216 kg / m 3 and the unit amount of each material to 100 parts by weight of cement On the other hand, the dust reducing agent shown in Table 2 was added to give a concrete for spraying.
This was pressure fed using a concrete pressure feeder "Swing Ace" manufactured by Sugiue Engineering Co., Ltd. From one side of the Y-shaped pipe provided on the way, a cement mineral powder quick setting agent (“Shotmaster” manufactured by Taiheiyo Materials Co., Ltd.) was pressure-fed by a quick-setting agent adding device “T Cleat” manufactured by Taiheiyo Materials Co., Ltd. 7 parts by weight with respect to parts by weight were mixed in the confluent mixing part to prepare quick-setting shotcrete.
This quick-setting sprayed concrete was sprayed at a spraying speed of 12 m 3 / h for 20 minutes into a simulated tunnel having a height of 8 m and a width of 10 m, and the amount of dust and the compressive strength were measured. The results are also shown in Table 2.
【００２８】（評価方法）
（１）粉塵量；上記模擬トンネルの両端をシートで閉鎖
し、１分毎に吹付け場所より３ｍの位置で光散乱式デジ
タル粉塵計（日本カノマックス社製モデル３４１１）に
より粉塵量を測定し、測定時間中の測定値（カウント
数）の平均値（測定結果／測定時間（分））をＣＰＭと
して示し、粉塵低減剤無添加の場合（比較例１）のカウ
ント数を１００としたときの相対値を、相対比として示
した。(Evaluation method) (1) Dust amount: Light-scattering type digital dust meter (Model 3411 manufactured by Japan Canomax Co., Ltd.) was placed at both ends of the simulated tunnel with sheets, and at a position 3 m from the spraying place every minute. The amount of dust is measured by, and the average value (measurement result / measurement time (minutes)) of the measured values (count number) during the measurement time is shown as CPM, and the count number when no dust reducing agent is added (Comparative Example 1) The relative value when 100 was set as 100 was shown as a relative ratio.
【００２９】（２）圧縮強度；幅５０cm×長さ５０cm×
奥行き２０cmの型枠に吹付けコンクリートを吹き付け、
コア抜きにより採取して高さを調整した直径５cm×高さ
１０cmの供試体を３体作成した。供試体を材齢２８日ま
で屋外暴露した後、ＪＩＳ Ａ １１０８−１９９９
「コンクリートの圧縮強度試験方法」に従って、圧縮強
度を測定した。(2) Compressive strength; width 50 cm x length 50 cm x
Spraying sprayed concrete onto the formwork with a depth of 20 cm,
Three test specimens having a diameter of 5 cm and a height of 10 cm were collected by removing the core and adjusted in height. After outdoor exposure of the specimen to 28 days of age, JIS A 1108-1999
The compressive strength was measured according to the “compressive strength test method for concrete”.
【００３０】[0030]
【表２】 [Table 2]
【００３１】表２の結果より、本発明の粉塵低減剤は、
極少量の添加量でも粉塵低減効果が認められ、吹付けコ
ンクリートの強度発現性にも優れていた。From the results shown in Table 2, the dust reducing agent of the present invention is
The dust reduction effect was recognized even with an extremely small amount of addition, and the strength development of shotcrete was excellent.
【００３２】実施例７〜１２
普通セメント４５０kg／m3、粗骨材５９５kg／m3、細骨
材１０５６kg／m3、及び水２０３kg／m3、ポリカルボン
酸系高性能ＡＥ減水剤（ＮＭＢ社製「ＮＴ−１０００Ｈ
Ｘ２」）をセメント１００重量部に対して０．８重量部
添加したコンクリートに、途中で設けたＹ字管の一方よ
り、セメント鉱物系粉末急結剤（太平洋マテリアル社製
「ショットマスター」）を、セメント１００重量部に対
して７重量部混合し、急結剤添加装置「Ｔクリート」で
圧送し、実施例１と同様にして、吹付け試験を行い、粉
塵量及び圧縮強度を測定した。急結剤には、表３に示す
粉塵低減剤を添加して用いた。結果を表３に示す。[0032] Examples 7 to 12 ordinary cement 450 kg / m 3, coarse aggregate 595kg / m 3, fine aggregates 1056kg / m 3, and water 203kg / m 3, polycarboxylic acid type high performance AE water reducing agent (NMB Inc. Made "NT-1000H
X2 ") to 0.8 parts by weight of cement added to 100 parts by weight of cement, and from one of the Y-shaped tubes provided in the middle, a cement mineral powder quick-setting agent (" Shotmaster "manufactured by Taiheiyo Materials Co., Ltd.). Then, 7 parts by weight of 100 parts by weight of cement were mixed and pressure-fed by a quick-setting admixture adding device "T Cleat", and a spraying test was conducted in the same manner as in Example 1 to measure dust amount and compressive strength. The dust reducing agent shown in Table 3 was added to the quick-setting agent and used. The results are shown in Table 3.
【００３３】[0033]
【表３】 [Table 3]
【００３４】表３の結果より、本発明の粉塵低減剤はい
ずれも、粉塵の発生量を低減することができ、しかも強
度の発現性も良好である。From the results shown in Table 3, each of the dust reducing agents of the present invention can reduce the amount of dust generated, and exhibits good strength development.
【００３５】実施例１３〜１５
粉塵低減剤を表４に示す方法で添加する以外は、実施例
１と同様にして、吹付け試験を行った。結果を表４に併
せて示す。Examples 13 to 15 Spray tests were conducted in the same manner as in Example 1 except that the dust reducing agent was added by the method shown in Table 4. The results are also shown in Table 4.
【００３６】[0036]
【表４】 [Table 4]
【００３７】表４の結果より、本発明の粉塵低減剤は、
従来用いられていたメチルセルロース系粉塵低減剤に比
べ、１／１０〜１／２０の添加量で、粉塵発生量を同等
以下に低減することができ、しかも吹付けコンクリート
の天端面、側壁面での付着性や、強度発現性も良好であ
る。From the results shown in Table 4, the dust reducing agent of the present invention is
Compared with the conventionally used methylcellulose-based dust reducing agent, the addition amount of 1/10 to 1/20 can reduce the amount of dust generation to the same level or less, and moreover, on the top and side walls of shotcrete. Good adhesion and strength development.
【００３８】[0038]
【発明の効果】本発明の粉塵低減剤は、粉末急結剤を用
いる湿式吹付け工法に有用であり、少ない添加量で粉塵
を十分に低減することができ、しかもモルタル等の強度
発現性も良好である。INDUSTRIAL APPLICABILITY The dust reducing agent of the present invention is useful in a wet spraying method using a powder quick-setting agent, can sufficiently reduce dust with a small amount of addition, and exhibits strength development properties such as mortar. It is good.
フロントページの続き (72)発明者 中島 裕 東京都西多摩郡日の出町大字大久野2650 太平洋マテリアル株式会社開発研究所内 (72)発明者 西 和紀 静岡県静岡市御幸町11−30 太平洋マテリ アル株式会社静岡営業所内 (72)発明者 小野 英明 千葉県佐倉市大作２丁目４番２号 太平洋 マテリアル株式会社開発研究所内 (72)発明者 上林 眞幸 東京都中央区日本橋本町４丁目８番15号 太平洋マテリアル株式会社内 (72)発明者 玉森 俊裕 東京都中央区日本橋本町４丁目８番15号 太平洋マテリアル株式会社内 Ｆターム(参考） 2D044 DC04 4G012 MB00 MB06 MB13 MB33 PB05 PB08 PB10 PB12 PB31 PC01 PC02 PC03 PC06 PC08 PC11 PD02 PE04 Continued front page (72) Inventor Yutaka Nakajima 2650 Okuno, Hinode-machi, Nishitama-gun, Tokyo Taiheiyo Materials Co., Ltd. (72) Inventor Kazunori Nishi 11-30 Miyukicho, Shizuoka City, Shizuoka Prefecture Pacific Materi Al Shizuoka Sales Office (72) Inventor Hideaki Ono 2-4 Daisaku, Sakura City, Chiba Prefecture Pacific Ocean Materials Co., Ltd. Development Laboratory (72) Inventor Masayuki Uebayashi 4-8-15 Nihonbashihonmachi, Chuo-ku, Tokyo Within Taiheiyo Material Co., Ltd. (72) Inventor Toshihiro Tamamori 4-8-15 Nihonbashihonmachi, Chuo-ku, Tokyo Within Taiheiyo Material Co., Ltd. F-term (reference) 2D044 DC04 4G012 MB00 MB06 MB13 MB33 PB05 PB08 PB10 PB12 PB31 PC01 PC02 PC03 PC06 PC08 PC11 PD02 PE04
Claims (9)
なる粉塵低減剤。1. A dust reducing agent comprising a quaternized poly (meth) acrylate.
リマーである請求項１記載の粉塵低減剤。2. The dust reducing agent according to claim 1, which is a homopolymer of a quaternary (meth) acrylate.
又は２記載の粉塵低減剤。3. The water retention capacity is 9 times or more of its own weight.
Or the dust reducing agent described in 2.
低減剤を含有するセメント混和剤。4. A cement admixture containing the dust reducing agent according to claim 1.
る請求項４記載のセメント混和剤。5. The cement admixture according to claim 4, further comprising a water reducing agent and / or a quick setting agent.
記載のセメント混和剤。6. The container according to claim 4, which is filled in a soluble container.
The cement admixture described.
低減剤、セメント、細骨材及び水を含有するモルタル。7. A mortar containing the dust reducing agent according to claim 1, cement, fine aggregate and water.
低減剤、セメント、細骨材及び水を含有するモルタルを
圧送し、別経路から急結剤を圧送し、合流混合部で混合
した後、吹き付けることを特徴とするモルタル吹付け工
法。8. A mortar containing the dust reducing agent according to claim 1, cement, fine aggregate and water is pressure-fed, and a quick-setting agent is pressure-fed from another route, and at the confluence mixing section. Mortar spraying method characterized by spraying after mixing.
タルを圧送し、別経路から請求項１〜３のいずれか１項
記載の粉塵低減剤及び急結剤を圧送し、合流混合部で混
合した後、吹き付けることを特徴とするモルタル吹付け
工法。9. A mortar containing cement, fine aggregate and water is pressure-fed, and the dust reducing agent and the quick-setting agent according to any one of claims 1 to 3 are pressure-fed from another route, and at a confluent mixing section. Mortar spraying method characterized by spraying after mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002095991A JP2003292359A (en) | 2002-03-29 | 2002-03-29 | Dust reduction agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002095991A JP2003292359A (en) | 2002-03-29 | 2002-03-29 | Dust reduction agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003292359A true JP2003292359A (en) | 2003-10-15 |
Family
ID=29239249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002095991A Pending JP2003292359A (en) | 2002-03-29 | 2002-03-29 | Dust reduction agent |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003292359A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011046574A (en) * | 2009-08-28 | 2011-03-10 | Denki Kagaku Kogyo Kk | Spray material and spraying method using the same |
| JP2011084440A (en) * | 2009-10-16 | 2011-04-28 | Denki Kagaku Kogyo Kk | Spray material and spraying method using the same |
| JP2018507839A (en) * | 2015-03-13 | 2018-03-22 | ユナイテッド・ステイツ・ジプサム・カンパニー | Hydrophobic finishing composition that maintains a long flow time, and building materials made therefrom |
-
2002
- 2002-03-29 JP JP2002095991A patent/JP2003292359A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011046574A (en) * | 2009-08-28 | 2011-03-10 | Denki Kagaku Kogyo Kk | Spray material and spraying method using the same |
| JP2011084440A (en) * | 2009-10-16 | 2011-04-28 | Denki Kagaku Kogyo Kk | Spray material and spraying method using the same |
| JP2018507839A (en) * | 2015-03-13 | 2018-03-22 | ユナイテッド・ステイツ・ジプサム・カンパニー | Hydrophobic finishing composition that maintains a long flow time, and building materials made therefrom |
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