JPS632847A - Rebound reducer - Google Patents
Rebound reducerInfo
- Publication number
- JPS632847A JPS632847A JP14609186A JP14609186A JPS632847A JP S632847 A JPS632847 A JP S632847A JP 14609186 A JP14609186 A JP 14609186A JP 14609186 A JP14609186 A JP 14609186A JP S632847 A JPS632847 A JP S632847A
- Authority
- JP
- Japan
- Prior art keywords
- rebound
- ethylene
- dust
- vinyl acetate
- weight
- 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
- 239000003638 chemical reducing agent Substances 0.000 title claims description 11
- 229920001577 copolymer Polymers 0.000 claims description 20
- 239000000839 emulsion Substances 0.000 claims description 17
- 239000000428 dust Substances 0.000 claims description 15
- 239000003995 emulsifying agent Substances 0.000 claims description 7
- 229920002554 vinyl polymer Polymers 0.000 claims description 7
- 239000000084 colloidal system Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 239000011378 shotcrete Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 11
- 239000004567 concrete Substances 0.000 description 10
- 238000005507 spraying Methods 0.000 description 8
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 7
- 239000005977 Ethylene Substances 0.000 description 7
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 7
- 238000010276 construction Methods 0.000 description 7
- 239000004568 cement Substances 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 230000001603 reducing effect Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- UPZFLZYXYGBAPL-UHFFFAOYSA-N 2-ethyl-2-methyl-1,3-dioxolane Chemical compound CCC1(C)OCCO1 UPZFLZYXYGBAPL-UHFFFAOYSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- LDHQCZJRKDOVOX-NSCUHMNNSA-N crotonic acid Chemical compound C\C=C\C(O)=O LDHQCZJRKDOVOX-NSCUHMNNSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920000609 methyl cellulose Polymers 0.000 description 2
- 239000001923 methylcellulose Substances 0.000 description 2
- 235000010981 methylcellulose Nutrition 0.000 description 2
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 2
- JTXMVXSTHSMVQF-UHFFFAOYSA-N 2-acetyloxyethyl acetate Chemical compound CC(=O)OCCOC(C)=O JTXMVXSTHSMVQF-UHFFFAOYSA-N 0.000 description 1
- 229920002126 Acrylic acid copolymer Polymers 0.000 description 1
- 241001448862 Croton Species 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- -1 acryl Chemical group 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229920003145 methacrylic acid copolymer Polymers 0.000 description 1
- 229940117841 methacrylic acid copolymer Drugs 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920005615 natural polymer Polymers 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
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、コンクリート吹付は工事の施工時に発生する
粉塵およびリバウンドの低減剤に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an agent for reducing dust and rebound generated during concrete spraying construction.
（従来の技術とその問題点）
近年、トンネル工法としてＮＡＴＭ （ＮｅｗＡｕｓ＋
ｃｒｉａｎ ＴｕｎｎｅｌｌｉｎｇＭｅｚｈｏｄ ）
の適用が我国でも本格化している。本方法は、トンネ
ル掘削後直ちに表面にコンクリートを吹き付は地山の崩
壊を防ぐ工法である。(Conventional technology and its problems) In recent years, NATM (NewAus+
crian TunnelingMezhod)
The application of this technology is gaining momentum in Japan as well. In this method, concrete is sprayed on the surface immediately after tunnel excavation to prevent the collapse of the ground.
コンクリートの吹付は工法には、乾式１法と湿式１法が
あり、従来は施工設備上の問題、急結剤の使用が容易等
の理由から乾式１法が多用されていたが、最近は湿式１
法の割合も増えつつある。There are two methods for concrete spraying: dry method 1 and wet method 1. In the past, dry method 1 was often used due to problems with construction equipment and the ease of using quick-setting agents, but recently wet method 1 has been used. 1
The proportion of laws is also increasing.
く乾式１法〉
水塊外の全ての材料を空練りした混合物と水をそれぞれ
別系統で吹付は機により圧送し、吹付はノズルの手前で
合流させてライニングコンクリートとして吹付ける工法
。Dry method 1 method> A method in which a mixture of all the materials other than the water mass is kneaded and water is pumped through separate systems using a machine, and the mixture is combined in front of the nozzle to form the lining concrete.
く湿式１法〉
急結剤を除く全ての材料を混練したスラリーを吹付は機
により圧送し、必要に応じて吹付はノズルの手前で急結
剤を加えてライニングコンクリートとして吹付ける工法
。Wet method 1> A slurry made by kneading all the materials except the quick-setting agent is pumped through a spraying machine, and if necessary, the quick-setting agent is added before the nozzle and sprayed as lining concrete.
しかし、これらのコンクリートの吹付は工事では、吹付
は施工時に発生する大量の粉塵が作業環境上大きな間勉
となっており、またリバウンド（はね返り）が吹付は量
の２０〜４０チにも達し原料のロスも著しいのが現状で
ある。However, during construction, spraying of concrete is a major nuisance due to the large amount of dust generated during construction, and the rebound can reach 20 to 40 inches of raw material. The current situation is that the loss is significant.
この様な問題点を解決する試みとして、現在まで以下の
様な低減剤の使用が種々考案されたが、その効果は十分
ではなかった。In an attempt to solve these problems, various methods have been devised to date to use the following reducing agents, but the effects have not been sufficient.
（１）天然高分子・・・メチルセルロース（＊１）、で
ん粉（＊１）
・ （＊２）
（２）合成高分子・・・ぼりアクリルアｑド 、ポリ
（＊１）
エチレンオキサイド 、アク
リルアミドーアクリル酸（ニス
チル）共重合体（＊１）、エチレン
−酢酸ビニル−塩化ビニル共１
（＄２）
合体 、アクリル酸（エステ
ル）共重合体
（＊１）粉末（＊り粉末液体の両者あり部分いわゆる「
ママコ」を発生しやすい。また、少量の溶解で粘度が急
増する場合が多く、希薄水溶液でしか扱えず作業性が悪
いという欠点もあった。(1) Natural polymers: methyl cellulose (*1), starch (*1), (*2) (2) Synthetic polymers: acryl aqdo, poly(*1) ethylene oxide, acrylamide acryl Acid (nystyl) copolymer (*1), ethylene-vinyl acetate-vinyl chloride copolymer ($2), acrylic acid (ester) copolymer (*1) powder (*The part that has both powder and liquid) "
It is easy to cause "mamako". In addition, the viscosity often increases rapidly when a small amount is dissolved, and it has the disadvantage that it can only be handled as a dilute aqueous solution, resulting in poor workability.
これらの技術は、例えば、特開昭６１−９７１５２号公
報、特開昭＜５ｏ−１４４４６６号公報、特開昭６１−
１１７１４８号公報として知られており、多少の改良は
認められるものの十分な効果は得られていない。These techniques are disclosed, for example, in JP-A-61-97152, JP-A-5O-144466, and JP-A-61-144466.
It is known as Japanese Patent No. 117148, and although some improvements have been recognized, sufficient effects have not been obtained.
本発明は、Ｎ ＡＴＭ工法において吹付は施工時に発生
する大量の粉塵およびリバウンドロスを顕著に低減させ
ることの可能な組成物に関するものであり、本発明者ら
は種々検討した結果エチレン−酢酸ビニル−不飽和カル
ボン酸共重合体エマルジョンが顕著な効果を示すことを
見出し、本発明を完成した。即ち、本発明は、エチレン
−酢酸ビニル−不飽和カルボン酸共重合体エマルジョン
を含有する吹付コンクリート用粉塵およびリバウンド低
減剤である。The present invention relates to a composition that can significantly reduce the large amount of dust and rebound loss generated during spraying in the NATM construction method. The present invention was completed based on the discovery that an unsaturated carboxylic acid copolymer emulsion exhibits remarkable effects. That is, the present invention is a dust and rebound reducing agent for shotcrete containing an ethylene-vinyl acetate-unsaturated carboxylic acid copolymer emulsion.
本発明で用いる不飽和カルボン酸としては、アクリル酸
、メタクリル酸、イタコン酸、クロトン酸等が挙げられ
るが、アクリル酸またはメタクリル酸が一般的である。Examples of the unsaturated carboxylic acid used in the present invention include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, etc., but acrylic acid or methacrylic acid is generally used.
不飽和カルボン酸の含有量量は０．１〜５重量％がよ＜
、０．５〜６重量％が好ましい。０．１重量−未満では
粉塵低減効果が少なく、５重量％を越えると単量体が水
溶性であるためエマルジョン重合に支障を来す場合があ
る。The content of unsaturated carboxylic acid is preferably 0.1 to 5% by weight.
, 0.5 to 6% by weight is preferred. If it is less than 0.1% by weight, the effect of reducing dust will be small, and if it exceeds 5% by weight, the monomer is water-soluble and may interfere with emulsion polymerization.
エチレン含有量は５〜４０重量％がよく、１０〜３０重
量％が好ましい。５重量％未満ではガラス転移点が高く
なり過ぎポリマーの柔軟性が低下し、粉塵およびリバウ
ンド低減効果が減少する恐れがある。また耐アルカリ性
が低下するため、けん化されやすくなり、強度が低下す
る可能性がある。The ethylene content is preferably 5 to 40% by weight, preferably 10 to 30% by weight. If it is less than 5% by weight, the glass transition point becomes too high, the flexibility of the polymer decreases, and the effect of reducing dust and rebound may decrease. Furthermore, since the alkali resistance decreases, it becomes more likely to be saponified and the strength may decrease.
エチレン含量が４０重量％を越えるとセメントや骨材と
の混和性が低下してくることがある。If the ethylene content exceeds 40% by weight, the miscibility with cement and aggregate may decrease.
本発明で用いるエマルジョンの乳化剤としてはポリビニ
ルアルコール、ヒドロキシエチルセルロースなどの高分
子保護コロイドが好ましく、トンネル内に湧れのある場
合など特にリバウンド低減効果が顕著である。さらに、
界面活性剤系の乳化剤の併用も可能である。As the emulsifier for the emulsion used in the present invention, a polymeric protective colloid such as polyvinyl alcohol or hydroxyethyl cellulose is preferable, and the effect of reducing rebound is particularly remarkable when there is a spring in the tunnel. moreover,
It is also possible to use a surfactant-based emulsifier.
エマルジョンの使用量は、セメントに対して０．０１〜
５重量％がよく、０．１〜１．５重量％が好ましい（固
型分換算）。ｏ、ｏ １ｘ量チ未満では粉塵およびリバ
ウンド低減効果少なく、５重量％を越えるとコンクリー
トの凝結および強度発現に悪影響を与える恐れがある。The amount of emulsion used is from 0.01 to cement.
It is preferably 5% by weight, and preferably 0.1 to 1.5% by weight (in terms of solid content). o, o If the amount is less than 1x, the effect of reducing dust and rebound will be small, and if it exceeds 5% by weight, it may adversely affect the setting and strength development of concrete.
エチレン−酢酸ビニル−不飽和カルボン酸共重合体エマ
ルションの粉塵およびリバウンド低減効果に関しては完
全に解明された訳ではないが、以下の理由によるものと
考えている。Although the dust and rebound reducing effect of the ethylene-vinyl acetate-unsaturated carboxylic acid copolymer emulsion has not been completely elucidated, it is believed to be due to the following reasons.
（１） アルカリ増粘性
エチレン−酢酸ビニル−不飽和カルボン醗共重合体エマ
ルジョンは、中性ないし微酸性雰囲気下では水溶性高分
子に比べて高樹脂分量でも粘度が低いが、アルカリ雰囲
気下では急激に増粘する。すなわちコンクリート（セメ
ント）と接触して急激に増粘し、リバウンドおよび粉塵
低減機能を発現する。従って本低減剤は、乾式１法に特
に好適であり、従来の増粘剤系の低減剤に比べて取扱い
が極めて簡便である。すなわち、従来の増粘剤系の低減
剤は少量の溶解で粘度が急増するため、輸送性、取扱い
性が悪くコンクリートへの添加量も制限されていたが、
エチレン−酢酸ビニル−不飽和カルボン酸共重合体エマ
ルションは水で容易に希釈でき、しかも粘度が低いため
取扱いが極めて簡便である。(1) Alkali-thickening ethylene-vinyl acetate-unsaturated carboxyl alcohol copolymer emulsions have lower viscosity compared to water-soluble polymers in neutral or slightly acidic atmospheres even when the resin content is high, but the viscosity decreases rapidly in alkaline atmospheres. The viscosity increases. In other words, it rapidly thickens upon contact with concrete (cement) and exhibits rebound and dust reduction functions. Therefore, this reducing agent is particularly suitable for the dry method 1, and is extremely easy to handle compared to conventional thickener-based reducing agents. In other words, the viscosity of conventional thickener-based reducing agents increases rapidly when dissolved in a small amount, making them difficult to transport and handle, limiting the amount that can be added to concrete.
Ethylene-vinyl acetate-unsaturated carboxylic acid copolymer emulsion can be easily diluted with water and has a low viscosity, making it extremely easy to handle.
（２） セメントおよび骨材との温和性セメントや骨
材への浸透分散性に優れているム
ため、瞬間的に均一に混合し、不完全（混合に由来する
粉塵の発生およびリバウンドロスを防止できる。−方ポ
リ酢酸ビニル系以外のエマルションは、セメントへの混
和性が劣る傾向にある。(2) Mild with cement and aggregates Excellent penetration and dispersion into cement and aggregates, allowing instant and uniform mixing, preventing incomplete mixing (dust generation and rebound loss caused by mixing) Yes, emulsions other than those based on polyvinyl acetate tend to have poor miscibility with cement.
以下実施例により本発明を説明する。尚、チは重量％を
示す。また、酢ビとは酢酸ビニルを表わす。The present invention will be explained below with reference to Examples. Incidentally, CH indicates weight %. Furthermore, vinyl acetate refers to vinyl acetate.
実施例１〜弥および比較例１〜相
本発明の粉塵およびリバウンド低減剤の評価を乾式法に
て実施した。茨１に示すコンクリート配合物から水を除
いたものを吹付は機に供給し、吹付は機より圧力約３．
５ ｋ！？／α２で空気圧送した。吹付はノズル手前の
ウォーターリングのところで別に高圧ポンプにより送ら
れてきた、所定量の本発明低減剤を含む水（表１中記載
）ｒ添加し、瞬時に混合した後、混合物を吹付はノズル
より施工面に吹付けた（１回の吹付量は３ｒｎ３であっ
た）。Examples 1 to 2 and Comparative Example 1 to 1 The dust and rebound reducing agents of the present invention were evaluated using a dry method. The concrete mixture shown in Ibara 1 with water removed is supplied to the spraying machine, and the spraying is carried out at a pressure of about 3.
5k! ? Pneumatic feeding was carried out at /α2. Spraying is carried out at the water ring in front of the nozzle, where a predetermined amount of water containing the reducing agent of the present invention (listed in Table 1) is sent separately by a high-pressure pump, and after mixing instantly, the mixture is sprayed from the nozzle. It was sprayed onto the construction surface (the amount of one spray was 3rn3).
測定データを衣２に示す。The measurement data is shown in Cloth 2.
（”１） ＥＶＡ−Ａｃ ：エチレンー酢ビーアク
リル酸共重合体エマルジョン
ＥＶＡ−ｍＡｃ ：エチレンー酢ビーメタクリル酸共重
合体エマルジョン
ＥＶＡ−１Ｔ ：エチレンー酢ピーイタコン酸共重合
体エマルジョン
ＥＶＡ−ＣＲ：エチレンー酢ピークロトン醪共重合体エ
マルジョン
ＭＣ：メチルセルロース（信越化学工
業社製）
ＰＡｍ ：ポリアクリルアミド（三脚コロイド化学
社製）
ＰＲ：Ｏ：ポリエチレンオキサイド（製鉄化学工業社製
）
ＰＡｍ−Ａｃ ニアクリルアミド−アクリル酸エステ
ル共重合体（栗田工業社！り
ＥＶＡ−Ｖｃ ：エチレン−酢ビー塩ビ共重合体エマ
ルジョン（ヘキス） 合Ｊｌｉｌ
製）
ＰＡｃ ニアクリル酸エステル共重合体エマルジョ
ン（三洋化成工業社製）
（＊２）固型分換算
（＊３）共重合体中重量比率
エチレン／酢ビ／アクリル酸＝２０／７８乳化剤：デｙ
力ＰＶＡＢ −１７（５％）（本４）共重合体中重量比
率
エチレン／酢ビ／メタクリル酸＝２０／乳化剤：ｆ／力
ＰＶＡＢ −ｉ ７ （５％）（本５）共重合体中重量
比率
エチレン／酢ビ／イタコン酸＝２０／７８乳化剤：デｙ
力ＰｖＡＢ −１７（５％ ）（＊６）共重合体中重量
比率
エチレン／酢ビ／クロトン酸＝２０／７８乳化Ｎｌ ：
テｙ力ＰＶ＊Ｂ −１７（５％）（卑７）共重合体中重
量比率
エチレン／酢ビ／アクリル酸＝２０／７８乳化剤：花王
エマルデン９８５ （５％ ）上記でＭＣ，ＰＡｍ 、
ＰＥＯは粉体のため５チ水溶液として添加した。(''1) EVA-Ac: Ethylene-acetic acid bee-acrylic acid copolymer emulsion EVA-mAc: Ethylene-acetic acid bee-methacrylic acid copolymer emulsion EVA-1T: Ethylene-acetic acid bee-itaconic acid copolymer emulsion EVA-CR: Ethylene-acetic acid bee croton mash Copolymer emulsion MC: Methyl cellulose (manufactured by Shin-Etsu Chemical Co., Ltd.) PAm: Polyacrylamide (manufactured by Tripod Colloidal Chemical Co., Ltd.) PR: O: Polyethylene oxide (manufactured by Steel Chemical Industry Co., Ltd.) PAm-Ac Niacrylamide-acrylic acid ester copolymer (Kurita Industries, Ltd.! EVA-Vc: Ethylene-acetate vinyl chloride copolymer emulsion (hex) manufactured by Jlil) PAc Niacrylic acid ester copolymer emulsion (manufactured by Sanyo Chemical Industries, Ltd.) (*2) Solid content equivalent ( *3) Copolymer weight ratio ethylene/vinyl acetate/acrylic acid = 20/78 Emulsifier: Day
PVAB-17 (5%) (Book 4) Copolymer weight ratio ethylene/vinyl acetate/methacrylic acid = 20/emulsifier: f/PVAB-i 7 (5%) (Book 5) Copolymer weight Ratio ethylene/vinyl acetate/itaconic acid = 20/78 Emulsifier: Day
Power PvAB -17 (5%) (*6) Copolymer weight ratio ethylene/vinyl acetate/crotonic acid = 20/78 Emulsified Nl:
PV*B-17 (5%) (base 7) copolymer weight ratio ethylene/vinyl acetate/acrylic acid = 20/78 Emulsifier: Kao Emulden 985 (5%) MC, PAm,
Since PEO was a powder, it was added as an aqueous solution.
（測定法）
粉塵量測定：粉塵計（柴田化学機械工業（株）Ｐ−５型
）使用。施工面より約５ｍ
の位置で測定。(Measurement method) Dust amount measurement: Using a dust meter (Shibata Kagaku Kikai Kogyo Co., Ltd. P-5 type). Measured at a position approximately 5m from the construction surface.
リバウンド試験：吹付下面にビニールシートを敷きリバ
ウンド量を計量。Rebound test: Place a vinyl sheet on the underside of the spray and measure the amount of rebound.
圧縮強度試験：１．６．６．２４時後の強度はプルアウ
ト法によりｎ＝３で測定。Compressive strength test: 1.6.6. The strength after 24 hours was measured using the pull-out method with n=3.
７．２８日後の強度は、円柱形コ
ア供試体（７，５ｃＩＬφｘ７．５ｃｍ）を切り取って
真面イオウキャッピン
グをして測定した（ ｎ ＝ ３ ）。7. The strength after 28 days was measured by cutting out a cylindrical core specimen (7.5cILφx7.5cm) and capping it with straight sulfur (n = 3).
本発明は、（１）粉塵およびリバウンド低減効果が大き
く 、［２１急結剤の急結効果に慾影響を及ぼさず（圧
縮強度の経時変化が少ない）、（３１Ｆ扱いの衡めて簡
便な低減剤である。The present invention has the following advantages: (1) It has a large dust and rebound reduction effect, does not affect the quick-setting effect of the 21 quick-setting agent (less change in compressive strength over time), and has a fairly simple reduction when treated as 31F. It is a drug.
特許出願人 １電気化学工業株式会社
手 続 補 正 書
昭和６１年７月１７日
特許庁長官 黒 １）明 雄 殿
１、事件の表示
昭和６１年特許願第１４６０９１号
２、発明の名称
リバウンド低減剤
３、補正をする者
事件との関係 特許出願人
住所 ■１００ 東京都千代田区有楽町１丁目４番１号
明細書の発明の詳細な説明の欄
５、補正の内容
１）第１３頁第３〜４行の「５％水溶液として添加した
。」を「５％水溶液としてから添加した。」と訂正する
。Patent Applicant 1 Denki Kagaku Kogyo Co., Ltd. Procedural Amendment Written July 17, 1986 Commissioner of the Patent Office Black 1) Akio Yu 1, Indication of the Case 1986 Patent Application No. 146091 2, Name of the Invention Rebound Reduction Agent 3. Relationship with the case of the person making the amendment Address of the patent applicant ■100 Column 5 of the detailed description of the invention in the specification, 1-4-1 Yurakucho, Chiyoda-ku, Tokyo, Contents of the amendment 1) Page 13, No. 3 In line 4, "Added as a 5% aqueous solution." is corrected to "Added as a 5% aqueous solution."
２）第１３頁第１１行の「２４時後」を「２４時間後」
と訂正する。2) Change “24 hours later” in line 11 of page 13 to “24 hours later”
I am corrected.
３）第１３頁第２０行の「圧縮強度の経時変化が少ない
」を「圧縮強度が、リバうンド低減剤無添加の場合と同
等である」と訂正する。3) On page 13, line 20, "There is little change in compressive strength over time" is corrected to "compressive strength is the same as when no rebound reducing agent is added."
Claims (1)
エマルジョンを含有する吹付コンクリート用粉塵および
リバウンド低減剤。 ２ エチレン−酢酸ビニル−不飽和カルボン酸共重合体
エマルジョンが乳化剤に高分子保護コロイドを使用した
該エマルジョンである特許請求の範囲第１項記載のリバ
ウンド低減剤。[Claims] 1. A dust and rebound reducing agent for shotcrete containing an ethylene-vinyl acetate-unsaturated carboxylic acid copolymer emulsion. 2. The rebound reducing agent according to claim 1, wherein the ethylene-vinyl acetate-unsaturated carboxylic acid copolymer emulsion is an emulsion using a polymeric protective colloid as an emulsifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14609186A JPS632847A (en) | 1986-06-24 | 1986-06-24 | Rebound reducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14609186A JPS632847A (en) | 1986-06-24 | 1986-06-24 | Rebound reducer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS632847A true JPS632847A (en) | 1988-01-07 |
Family
ID=15399928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14609186A Pending JPS632847A (en) | 1986-06-24 | 1986-06-24 | Rebound reducer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS632847A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008043516A1 (en) | 2008-11-06 | 2010-05-12 | Wacker Chemie Ag | Method for the application of polymer-modified wet concrete mixtures |
| US10560084B2 (en) | 2017-09-08 | 2020-02-11 | Toshiba Memory Corporation | Level shift circuit |
-
1986
- 1986-06-24 JP JP14609186A patent/JPS632847A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008043516A1 (en) | 2008-11-06 | 2010-05-12 | Wacker Chemie Ag | Method for the application of polymer-modified wet concrete mixtures |
| US9186697B2 (en) | 2008-11-06 | 2015-11-17 | Wacker Chemie Ag | Methods for applying polymer-modified wet concrete mixtures |
| US10560084B2 (en) | 2017-09-08 | 2020-02-11 | Toshiba Memory Corporation | Level shift circuit |
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