JP4388250B2 - Hydraulic composition and cured body thereof - Google Patents
Hydraulic composition and cured body thereof Download PDFInfo
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- JP4388250B2 JP4388250B2 JP2001389341A JP2001389341A JP4388250B2 JP 4388250 B2 JP4388250 B2 JP 4388250B2 JP 2001389341 A JP2001389341 A JP 2001389341A JP 2001389341 A JP2001389341 A JP 2001389341A JP 4388250 B2 JP4388250 B2 JP 4388250B2
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- 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
- C04B28/06—Aluminous cements
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- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/23—Acid resistance, e.g. against acid air or rain
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- 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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、耐酸性に優れ、表面に脆弱層を生成しない水硬性組成物、及びその硬化体に関する。
【０００２】
【従来の技術】
モルタルやコンクリートは、下水処理施設のようにpH１〜３の硫酸雰囲気にさらされるような環境下で表層部の水酸化カルシウムが硫酸イオンと反応して２水石膏を生成し、更に場合によりアルミン酸三カルシウムと反応してエトリンガイドを生成し、膨張破壊を起こす。下水処理施設を防食ライニングにより補修しても、表面にピンポールが存在するとそこから膨張破壊を起こす。
【０００３】
従って、硬化体に耐薬品性、耐硫酸塩性、耐海水性を付与させるために、高炉セメント、高炉スラグ等を使用することが多い。これは高炉スラグの潜在水硬性により硬化体の水密性を向上させることによって、塩素イオン、硫酸イオンの浸透を低減させるためである。また、高炉スラグ中のアルミニウム化合物が、浸透してくる塩素イオン、硫酸イオンと反応してフリーデル氏塩、エトリンガイドの形で固定化し、それ以上の浸透を防止することは、従来より知られている。しかし、耐硫酸性を向上させるには、スラグ添加率が高くないと大きな効果は得られないが、モルタルやコンクリート中のスラグ添加率が高くなると収縮率が大きくなり、ひび割れ発生の問題が生じる。
【０００４】
また、耐硫酸性を向上させるために、劣化原因となる水酸化カルシウムを含有しないアルミナセメントを用いる場合がある。しかし、アルミナセメントは下記に示す水和反応に多量の水を必要とするため、乾燥環境下では、未水和部分が残り、硬化体表面に脆弱層が出現する問題点があった。
CA＋10H2O→CAH10
2CA＋11H2O→C2AH8＋AH3
3CA＋12H2O→C3AH6＋AH3
ここで、Ｃ：ＣａＯ、Ａ：Ａｌ2Ｏ3、Ｈ：Ｈ2Ｏを示す。
更に、乾燥環境下で表面からの水の蒸発の影響を受けると、硬化体表面に脆弱層が多くなる。
【０００５】
【発明が解決しようとする課題】
本発明は、水硬性組成物の耐酸性を向上させるためにアルミナセメントを用いた場合において、乾燥環境下においてその硬化体の表面での脆弱層の発生を解決することを課題とする。
【０００６】
【課題を解決するための手段】
本発明者等は保水剤及び遅延剤を使用して、アルミナセメント単独の場合に多量の水を必要とする急激な水和反応を遅延させると、アルミナセメントがスラグと反応してゲーレナイト水和物(C2ASH8)（ここで、Ｃ、Ａ及びＨは前記の通りであり、ＳはSiO2を示す）を生成し、硬化体全体に均一な水和反応をさせることができ、乾燥の影響を受けやすい硬化体表層部も健全になることを見出した。これは、アルミナセメントの主な水和物であるCAH10は、カルシウム１分子に対して１０H2Oを必要とする。これに対しスラグと反応して生成するゲーレナイト水和物(C2ASH8)は、カルシウム１分子に対して４H2Oを必要とすることによる。また、保水剤を使用することにより、モルタル表面から水の蒸発が防がれ、硬化体全体に均一な水和反応を起こさせることができることを見出した。更に、廃棄物溶融スラグを添加すると、そのベアリング効果により、コテ作業性やポンプ圧送性が改善されることを見出した。
【０００７】
即ち本発明は、（Ａ）アルミナセメント２０〜９０重量％及び（Ｂ）ブレーン比表面積３０００〜１５０００cm2／ｇのスラグ粉末１０〜８０重量％からなる混合物１００重量部に対し、（Ｃ）保水剤０．０５〜０．５重量部及び（Ｄ）有機カルボン酸及びその塩からなる遅延剤０．０２〜１．０重量部を含み、（Ｅ）石膏を含まない水硬性組成物を提供するものである。
【０００８】
本発明はまた、上記水硬性組成物１００重量部に対し、骨材８０〜５００重量部及び廃棄物溶融スラグ、有機樹脂、有機繊維、消泡剤から選ばれる１種類以上の材料を含んでなる混合物に水を添加して硬化させた硬化体を提供するものである。
【０００９】
【発明の実施の形態】
本発明に用いられるアルミナセメントは、CaO・Al2O3を主鉱物成分として、Al2O3を全体の３５重量％以上含む限り特に限定されるものではなく、市販されているものが使用できる。例えば、ラファージュ社製の商品名「セカール51BTF」「セカール71」「セカール80」「シマンフォンデュ」「カルコートRG」、太平洋マテリアル社製の商品名「アサノアルミナセメント1号」「アサノアルミナセメント2号」、電気化学工業社製の商品名「アルミナセメント1号」「アルミナセメント2号」「ハイアルミナセメント」、旭硝子社製「アルミナセメント1号」「アサヒフォンデュ」等が使用できる。アルミナセメントの配合量は、通常アルミナセメントとスラグ粉末との混合物の２０〜９０重量％であり、好ましくは２０〜８０重量％である。
【００１０】
上記スラグ粉末としては、高炉スラグ、転炉スラグ、脱リンスラグ等のスラグ微粉末を１種又は２種以上混合したもので、ブレーン比表面積（ＪＩＳ Ｒ５２０１）が３０００〜１５０００cm2／ｇ、好ましくは４０００〜５０００cm2／ｇのものが用いられる。その配合量は、アルミナセメントとスラグ粉末との混合物の１０〜８０重量％、好ましくは２０〜８０重量％である。
【００１１】
保水剤としては、親水性に優れ、水硬性組成混練物又はその硬化体中の水分の移動及び蒸発を抑制する材料が用いられる。例えば水溶性セルロース、ポリビニルアルコール、ポリエーテル等の水溶性高分子；アクリル酸・ビニルアルコール共重合体、アクリル酸ナトリウム共重合体、ポリアクリル酸共重合体、デンプン・アクリル酸塩グラフト共重合体等が用いられる。その配合量は、水硬性組成物１００重量部に対し、０．０５〜０．５重量部、好ましくは０．１〜０．５重量部である。０．０５重量部未満では必要とする保水性が上がらず、０．５重量部を超えると非常に水を必要とし強度が低下する。
【００１２】
遅延剤は、水硬性組成物の水和反応を遅らせるものであれば、特に限定されない。好ましくはクエン酸、酒石酸、グルコン酸、ヘプトン酸等の有機カルボン酸及びその塩、より好ましくは酒石酸、クエン酸である。その配合量は、水硬性組成物１００重量部に対し、０．０２〜１．０重量部、好ましくは０．０２〜０．２重量部用いられる。０．０２重量部未満でアルミナセメントの水和反応を遅らせることができず、１．０重量部を超えると水和反応が遅れ、強度が低下する恐れがある。
【００１３】
廃棄物溶融スラグとは、下水汚泥、都市ゴミ等の廃棄物の焼却物に必要により粘土、石灰、石膏等の１種または２種以上を配合したものを高温で溶融し急冷して得られたスラグ（下水汚泥溶融スラグ、都市スラグ焼却灰溶融スラグ）であり、ブレーン比表面積８０００cm2／ｇ以下のものを用いるのが好ましい。好ましくは、水硬性組成物１００重量部に対し１〜４０重量部、好ましくは１〜３０重量部用いられる。
【００１４】
消泡剤としては、市販のものであれば、特に限定されない。好ましくは、水硬性組成物１００重量部に対し０．０５〜１重量部、より好ましくは０．１〜０．５重量部用いられる。
【００１５】
有機樹脂としては、天然ゴム、スチレン・ブタジエン共重合体、クロロプレンゴム、アクリロニトリル・ブタジエン共重合体及びメチルメタクリレート・ブタシエン共重合体等のゴムラテックス；ポリプロピレン、ポリクロロプレン、ポリ酢酸ビニル、ポリアクリル酸エステル、スチレン・アクリル共重合体、酢酸ビニル・アクリル共重合体、エチレン・酢酸ビニル共重合体、エチレン・酢酸ビニル・塩化ビニル共重合体、酢酸ビニル・ビニルバーサテート共重合体、不飽和ポリエステル樹脂、ポリウレタン樹脂、アルキド樹脂及びエポキシ樹脂等の合成樹脂；セルロース誘導体、ポリビニルアルコール、ポリアクリル酸塩及びフルフリルアルコール等の水溶性ポリマー等の１種以上の粉末、エマルション又は溶液（水溶液含む）が用いられる。好ましくは水硬性組成物１００重量部に対し固形分換算で０．５〜１０重量部、更に好ましくは１〜５重量部用いられる。
【００１６】
有機繊維は特に限定されない。例えば、ビニロン繊維、アクリル繊維、アラミド繊維、炭素繊維等が例示される。好ましくは水硬性組成物１００重量部に対し０．０３〜０．３重量部、更に好ましくは０．１〜０．３重量部用いられる。
【００１７】
骨材は、市販のものであれば、特に限定されない。砂、砂利、砕石、砕砂、人工軽量骨材、スラグ骨材、クリンカー骨材等の単一もしくは混合物が用いられる。骨材は、水硬性組成物１００重量部に対し通常８０〜５００重量部、好ましくは１００〜３００重量部用いられる。
【００１８】
その他の混和材（剤）として、石膏、膨張材、減水剤等の分散剤、収縮低減剤、発泡剤、防水剤、防錆剤、凝結調整剤等の各種混和材（剤）の１種又は２種以上を添加しても良い。
【００１９】
水硬性組成物の混合に関して、粉体を混合する方法について限定はされない。例えばレディゲミキサー、プローシェアーミキサー、リボンミキサー、噴射式ミキサー等により混合することができる。
【００２０】
添加する水としては、水道水、地下水、河川水を用いることができるが、好ましくは「JIS A5308 付属書9 レディーミクストコンクリートの混練に用いる水」に適合する水を用いる。
水の量は限定するものではなく、用途に合った範囲でよい。好ましくは水硬性組成物１００重量部に対し２０〜７０重量部、更に好ましくは３０〜５０重量部用いられる。
【００２１】
モルタルの混練に関して、水硬性組成物（粉体）と水を混練する方法について限定はされない。例えば、ハンドミキサー、左官ミキサー、強制ミキサー、連続式ミキサー等を用いて混練することができる。
【００２２】
施工方法としては、コテによる左官施工、ポンプ（スクィーズポンプ、スネークポンプ、プランジャーポンプ）による吹付け施工、ポンプ（スクィーズポンプ、スネークポンプ、プランジャーポンプ）等による流し込みによるグラウト施工が挙げられる。
【００２３】
【実施例】
以下実施例により本発明を詳しく説明するが、本発明は以下の実施例により限定されるものではない。
実施例１〜８、比較例１〜１０
表１に示す配合物の硬化体を作成し、表１に示す物理的及び化学的試験を行った。試験方法は下記の通りである。
＜圧縮強度試験＞
JIS R5201「セメントの物理試験方法」に準じた。
＜付着強度試験＞
東京都下水道局施設管理部「断面補修材の要求性能」の付着力試験に準じた。
（養生条件：温度２０℃、湿度８０％）
＜破断面評価試験＞
付着強度試験を行った際の破断面の評価を次に示す評価基準（Ａ〜Ｄ）に基き評価した。
Ａ：コンクリート内破断
Ｂ：コンクリートとモルタルとの界面破断。
Ｃ：モルタル凝集破断
Ｄ：モルタル表層破断
＜耐硫酸試験＞
東京都下水道局施設管理部「断面補修材の要求性能」の密度特性試験（浸透拡散抵抗性）に準じた。
＜転移確認試験＞
JIS R5201「セメントの物理試験方法」に準じて材齢２８日まで養生した試験体を、８０℃６時間蒸気養生したのちに、JIS R5201「セメントの物理試験方法」に準じて強度試験を行った。転移抑制効果（％）は下記の式により算出した。
転移抑制効果（％）＝蒸気養生後の圧縮強度／蒸気養生前の圧縮強度×１００＜作業性の評価＞
コンクリートよう壁の垂直面へ左官コテで塗付け、作業性を評価した結果、いずれの実施例とも作業性（コテへの付着性やコテ伸び）に支障は見られなかった。
また、スクイズ式モルタルポンプに連通させた内径４０ｍｍ、長さ４０ｍの圧送ホース端に取り付けた吐出口径１４ｍｍのスプレーガンを用い、同様のよう壁垂直面にモルタルを連続５分間吹付け、ポンプ圧送性の確認を行ったが、いずれの実施例もホース目詰まりもなく、順調に吹き付けできた。
以上の試験結果を表１に示す。
【００２４】
【表１】
1) 普通セメント：太平洋セメント社製 普通ポルトランドセメント
2) アルミナセメント：ラファージュ社製 セカール51BTF
3) スラグ微粉末：第一セメント社製 ファインセラメント(ブレーン比表面積8000cm2/g)
4) 保水剤：信越化学工業社製 90SH-4000
5) 遅延剤：関東化学社製L-酒石酸1級試薬
6) 廃棄物溶融スラグ：東京都下水汚泥スラグ(ブレーン比表面積4200cm2/g)
7) 消泡剤：サンノプコ社製 SNデフォーマー14HP
8) 有機繊維：クラレ社製 RMS182X6
9) 粉末樹脂：ワッカー社製 ヴィナパスRE524Z
10) 骨材：山形県産珪砂(F.M.＝2.5)
【００２６】
【発明の効果】
本発明によると、耐酸性、付着強度、圧縮強度、転移抑制効果に優れ、表面に脆弱層が発生しない硬化体が得られる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic composition that is excellent in acid resistance and does not generate a fragile layer on the surface, and a cured product thereof.
[0002]
[Prior art]
For mortar and concrete, calcium hydroxide in the surface layer reacts with sulfate ions in an environment exposed to a sulfuric acid atmosphere of pH 1 to 3 as in a sewage treatment facility to produce dihydrate gypsum, and in some cases aluminate Reacts with tricalcium to produce an ethrin guide, causing expansion and destruction. Even if the sewage treatment facility is repaired with an anti-corrosion lining, if there is a pin pole on the surface, expansion failure will occur from there.
[0003]
Therefore, blast furnace cement, blast furnace slag, and the like are often used in order to impart chemical resistance, sulfate resistance, and seawater resistance to the cured body. This is to reduce the penetration of chlorine ions and sulfate ions by improving the water tightness of the cured body due to the latent hydraulic properties of the blast furnace slag. In addition, it has been known that aluminum compounds in blast furnace slag are immobilized in the form of Friedel's salt and ethrin guide by reacting with infiltrating chloride and sulfate ions to prevent further penetration. It has been. However, in order to improve the sulfuric acid resistance, a large effect cannot be obtained unless the slag addition rate is high. However, if the slag addition rate in mortar or concrete is high, the shrinkage rate becomes large and the problem of cracking occurs.
[0004]
Moreover, in order to improve sulfuric acid resistance, the alumina cement which does not contain the calcium hydroxide which causes deterioration may be used. However, since alumina cement requires a large amount of water for the hydration reaction shown below, there is a problem that an unhydrated portion remains in a dry environment and a fragile layer appears on the surface of the cured body.
CA + 10H 2 O → CAH 10
2CA + 11H 2 O → C 2 AH 8 + AH 3
3CA + 12H 2 O → C 3 AH 6 + AH 3
Here, C: CaO, A: Al 2 O 3 , and H: H 2 O are shown.
Furthermore, when affected by the evaporation of water from the surface in a dry environment, the fragile layer increases on the surface of the cured body.
[0005]
[Problems to be solved by the invention]
This invention makes it a subject to solve generation | occurrence | production of the weak layer on the surface of the hardening body in a dry environment, when an alumina cement is used in order to improve the acid resistance of a hydraulic composition.
[0006]
[Means for Solving the Problems]
When the present inventors use a water retention agent and a retarder to delay a rapid hydration reaction that requires a large amount of water in the case of an alumina cement alone, the alumina cement reacts with the slag and the galenite hydrate. (C 2 ASH 8 ) (where C, A and H are as described above, and S represents SiO 2 ), and the cured body can be uniformly hydrated and dried. It has been found that the hardened body surface layer which is easily affected is also healthy. This is because CAH 10 , which is the main hydrate of alumina cement, requires 10H 2 O per calcium molecule. On the other hand, the gehlenite hydrate (C 2 ASH 8 ) produced by reacting with slag is because 4H 2 O is required for one calcium molecule. It has also been found that the use of a water retention agent prevents water from evaporating from the mortar surface and can cause a uniform hydration reaction throughout the cured body. Furthermore, when waste melt | dissolution slag was added, it discovered that the iron workability | operativity and pumping ability were improved by the bearing effect.
[0007]
That is, the present invention relates to (C) a water retention agent for 100 parts by weight of a mixture consisting of (A) 20 to 90% by weight of alumina cement and (B) 10 to 80% by weight of slag powder having a specific surface area of 3000 to 15000 cm 2 / g. 0.05 to 0.5 part by weight and (D) a retarder comprising 0.02 to 1.0 part by weight of an organic carboxylic acid and a salt thereof, and (E) a hydraulic composition not containing gypsum It is.
[0008]
The present invention also comprises 80 to 500 parts by weight of aggregate and at least one material selected from waste molten slag, organic resin, organic fiber and antifoaming agent with respect to 100 parts by weight of the hydraulic composition. The present invention provides a cured product obtained by adding water to a mixture and curing the mixture.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The alumina cement used in the present invention is not particularly limited as long as it contains CaO · Al 2 O 3 as a main mineral component and Al 2 O 3 in an amount of 35% by weight or more, and a commercially available one can be used. . For example, trade names “SECAL 51BTF”, “SECAL 71”, “SECAL 80”, “Siman Fondue”, “Calcort RG” manufactured by Lafarge, and product names “ASANO ALUMINA CEMENT 1” “ASANO ALUMINUM CEMENT 2” manufactured by Taiheiyo Materials Co., Ltd. The trade names “Alumina Cement No. 1”, “Alumina Cement No. 2”, “High Alumina Cement” manufactured by Denki Kagaku Kogyo Co., Ltd., “Alumina Cement No. 1” “Asahi Fondue” manufactured by Asahi Glass Co., Ltd., etc. can be used. The compounding amount of alumina cement is usually 20 to 90% by weight, preferably 20 to 80% by weight, based on the mixture of alumina cement and slag powder.
[0010]
The slag powder is a mixture of one or more slag fine powders such as blast furnace slag, converter slag, dephosphorization slag, etc., and has a Blaine specific surface area (JIS R5201) of 3000 to 15000 cm 2 / g, preferably 4000. The one of ˜5000 cm 2 / g is used. The blending amount is 10 to 80% by weight, preferably 20 to 80% by weight of the mixture of alumina cement and slag powder.
[0011]
As the water retention agent, a material that has excellent hydrophilicity and suppresses the movement and evaporation of water in the hydraulic composition kneaded product or its cured product is used. For example, water-soluble polymers such as water-soluble cellulose, polyvinyl alcohol, polyether; acrylic acid / vinyl alcohol copolymer, sodium acrylate copolymer, polyacrylic acid copolymer, starch / acrylate graft copolymer, etc. Is used. The blending amount is 0.05 to 0.5 parts by weight, preferably 0.1 to 0.5 parts by weight with respect to 100 parts by weight of the hydraulic composition. If the amount is less than 0.05 parts by weight, the required water retention does not increase. If the amount exceeds 0.5 parts by weight, water is required and the strength is lowered.
[0012]
The retarder is not particularly limited as long as it delays the hydration reaction of the hydraulic composition. Preferred are organic carboxylic acids such as citric acid, tartaric acid, gluconic acid, heptonic acid and their salts, and more preferred are tartaric acid and citric acid. The blending amount is 0.02 to 1.0 part by weight, preferably 0.02 to 0.2 part by weight, per 100 parts by weight of the hydraulic composition. If the amount is less than 0.02 part by weight, the hydration reaction of the alumina cement cannot be delayed. If the amount exceeds 1.0 part by weight, the hydration reaction may be delayed and the strength may be reduced.
[0013]
Waste melting slag was obtained by melting and rapidly cooling one or more types of clay, lime, gypsum, etc., as required for waste incineration such as sewage sludge and municipal waste Slag (sewage sludge molten slag, municipal slag incinerated ash molten slag), preferably having a brain specific surface area of 8000 cm 2 / g or less. Preferably, 1 to 40 parts by weight, preferably 1 to 30 parts by weight are used with respect to 100 parts by weight of the hydraulic composition.
[0014]
The antifoaming agent is not particularly limited as long as it is commercially available. Preferably, 0.05 to 1 part by weight, more preferably 0.1 to 0.5 part by weight is used with respect to 100 parts by weight of the hydraulic composition.
[0015]
Organic resins include natural rubber, rubber latex such as styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer, and methyl methacrylate / butacene copolymer; polypropylene, polychloroprene, polyvinyl acetate, polyacrylate , Styrene / acrylic copolymer, vinyl acetate / acrylic copolymer, ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate / vinyl versatate copolymer, unsaturated polyester resin, Synthetic resins such as polyurethane resins, alkyd resins and epoxy resins; one or more powders, emulsions or solutions (including aqueous solutions) such as cellulose derivatives, water-soluble polymers such as polyvinyl alcohol, polyacrylate and furfuryl alcohol are used. . Preferably, 0.5 to 10 parts by weight, more preferably 1 to 5 parts by weight in terms of solid content is used with respect to 100 parts by weight of the hydraulic composition.
[0016]
The organic fiber is not particularly limited. For example, vinylon fiber, acrylic fiber, aramid fiber, carbon fiber and the like are exemplified. Preferably it is 0.03-0.3 weight part with respect to 100 weight part of hydraulic compositions, More preferably, 0.1-0.3 weight part is used.
[0017]
The aggregate is not particularly limited as long as it is commercially available. Single or a mixture of sand, gravel, crushed stone, crushed sand, artificial lightweight aggregate, slag aggregate, clinker aggregate or the like is used. The aggregate is usually used in an amount of 80 to 500 parts by weight, preferably 100 to 300 parts by weight, based on 100 parts by weight of the hydraulic composition.
[0018]
As other admixtures (agents), one type of various admixtures (agents) such as gypsum, expansion agent, water reducing agent, dispersing agent, shrinkage reducing agent, foaming agent, waterproofing agent, rust preventive, setting agent, etc. Two or more kinds may be added.
[0019]
Regarding the mixing of the hydraulic composition, there is no limitation on the method of mixing the powder. For example, the mixture can be performed by a Redige mixer, a plow shear mixer, a ribbon mixer, a jet mixer, or the like.
[0020]
As the water to be added, tap water, ground water, and river water can be used, but preferably water that conforms to “JIS A5308 Annex 9 Water used for kneading ready mixed concrete”.
The amount of water is not limited and may be in a range suitable for the application. Preferably it is 20-70 weight part with respect to 100 weight part of hydraulic compositions, More preferably, 30-50 weight part is used.
[0021]
Regarding kneading of the mortar, there is no limitation on the method of kneading the hydraulic composition (powder) and water. For example, kneading can be performed using a hand mixer, a plastering mixer, a forced mixer, a continuous mixer, or the like.
[0022]
Examples of construction methods include plastering with a trowel, spraying with a pump (squeeze pump, snake pump, plunger pump), and grouting with a pump (squeeze pump, snake pump, plunger pump).
[0023]
【Example】
EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples.
Examples 1-8, Comparative Examples 1-10
Cured bodies of the formulations shown in Table 1 were prepared and subjected to physical and chemical tests shown in Table 1. The test method is as follows.
<Compressive strength test>
Conforms to JIS R5201 “Cement physical test method”.
<Adhesion strength test>
Adhered to the adhesion test of “Required performance of cross-section repair materials” at the Tokyo Metropolitan Sewerage Bureau Facility Management Department.
(Curing conditions: temperature 20 ° C, humidity 80%)
<Fracture surface evaluation test>
The evaluation of the fracture surface when the adhesion strength test was performed was evaluated based on the following evaluation criteria (A to D).
A: Internal fracture B: Interfacial fracture between concrete and mortar.
C: Mortar cohesive fracture D: Mortar surface layer fracture <sulfuric acid resistance test>
Conforms to the density characteristic test (permeation diffusion resistance) of “Required performance of cross-sectional repair material” in Tokyo Metropolitan Sewerage Bureau Facility Management Department.
<Transfer confirmation test>
After the specimens cured to 28 days of age according to JIS R5201 “Cement physical test method” were steam-cured at 80 ° C. for 6 hours, a strength test was performed according to JIS R5201 “Cement physical test method”. . The metastasis inhibitory effect (%) was calculated by the following formula.
Metastasis suppression effect (%) = compressive strength after steam curing / compressive strength before steam curing × 100 <Evaluation of workability>
As a result of applying a plastering iron to the vertical surface of the concrete wall and evaluating workability, no trouble was found in workability (stickiness to the iron or elongation of the iron) in any of the examples.
Also, using a spray gun with a discharge port diameter of 14 mm attached to the end of a pressure feed hose with an inner diameter of 40 mm and a length of 40 m connected to a squeeze mortar pump, the mortar was sprayed on the vertical surface of the wall in the same manner for 5 minutes, and the pump pumpability However, in any of the examples, there was no clogging of the hose and it was possible to spray smoothly.
The test results are shown in Table 1.
[0024]
[Table 1]
1) Ordinary cement: Taiheiyo Cement ordinary Portland cement
2) Alumina cement: Sefar 51BTF manufactured by Lafarge
3) Slag fine powder: Fine Serament made by Daiichi Cement Co., Ltd. (Brain specific surface area 8000cm 2 / g)
4) Water retention agent: Shin-Etsu Chemical 90SH-4000
5) Delay agent: L-tartaric acid first grade reagent manufactured by Kanto Chemical Co., Inc.
6) Waste molten slag: Tokyo sewage sludge slag (Brain specific surface area 4200cm 2 / g)
7) Antifoam: SN deformer 14HP manufactured by San Nopco
8) Organic fiber: Kuraray RMS182X6
9) Powder resin: Vinapass RE524Z manufactured by Wacker
10) Aggregate: Silica sand from Yamagata Prefecture (FM = 2.5)
[0026]
【The invention's effect】
According to the present invention, it is possible to obtain a cured product that is excellent in acid resistance, adhesion strength, compressive strength, and transition suppression effect and does not generate a fragile layer on the surface.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001389341A JP4388250B2 (en) | 2001-12-21 | 2001-12-21 | Hydraulic composition and cured body thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001389341A JP4388250B2 (en) | 2001-12-21 | 2001-12-21 | Hydraulic composition and cured body thereof |
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| Publication Number | Publication Date |
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| JP2003192423A JP2003192423A (en) | 2003-07-09 |
| JP4388250B2 true JP4388250B2 (en) | 2009-12-24 |
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| JP4681359B2 (en) * | 2004-06-23 | 2011-05-11 | 大成建設株式会社 | High-strength mortar, high-strength concrete, method for producing high-strength mortar hardened body, method for improving durability of structure, and premix material for high-strength mortar |
| JP4614122B2 (en) * | 2004-07-30 | 2011-01-19 | 宇部興産株式会社 | Hydraulic composition with improved wet adhesion |
| JP5149489B2 (en) * | 2005-03-15 | 2013-02-20 | 清水建設株式会社 | Acid resistant composition |
| JP4634213B2 (en) * | 2005-04-27 | 2011-02-16 | 電気化学工業株式会社 | Alumina cement composition and repair method using the same |
| JP5085015B2 (en) * | 2005-05-26 | 2012-11-28 | 電気化学工業株式会社 | Anticorrosive composite and process for producing the same |
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