JP2006306646A - Alumina cement composition and repairing method using the same - Google Patents
Alumina cement composition and repairing method using the same Download PDFInfo
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- JP2006306646A JP2006306646A JP2005129527A JP2005129527A JP2006306646A JP 2006306646 A JP2006306646 A JP 2006306646A JP 2005129527 A JP2005129527 A JP 2005129527A JP 2005129527 A JP2005129527 A JP 2005129527A JP 2006306646 A JP2006306646 A JP 2006306646A
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- 239000004568 cement Substances 0.000 title claims abstract description 72
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000000203 mixture Substances 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- KWLMIXQRALPRBC-UHFFFAOYSA-L hectorite Chemical compound [Li+].[OH-].[OH-].[Na+].[Mg+2].O1[Si]2([O-])O[Si]1([O-])O[Si]([O-])(O1)O[Si]1([O-])O2 KWLMIXQRALPRBC-UHFFFAOYSA-L 0.000 claims abstract description 15
- 229910000271 hectorite Inorganic materials 0.000 claims abstract description 15
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- 229920005594 polymer fiber Polymers 0.000 claims abstract description 14
- 238000010521 absorption reaction Methods 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims description 13
- 239000003112 inhibitor Substances 0.000 claims description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 44
- 238000011161 development Methods 0.000 abstract description 17
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 239000004570 mortar (masonry) Substances 0.000 description 26
- 238000002474 experimental method Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 238000013035 low temperature curing Methods 0.000 description 9
- 239000013065 commercial product Substances 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- 239000002893 slag Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000000843 powder Substances 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910018068 Li 2 O Inorganic materials 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
- 238000001723 curing Methods 0.000 description 4
- 229910021487 silica fume Inorganic materials 0.000 description 4
- 229920002978 Vinylon Polymers 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920002972 Acrylic fiber Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 229910052901 montmorillonite Inorganic materials 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000003242 anti bacterial agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000004815 dispersion polymer Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N lithium oxide Chemical compound [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 229910001947 lithium oxide Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000007974 melamines Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-N naphthalene-1-sulfonic acid Chemical class C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-N 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000011414 polymer cement Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 1
- 150000003460 sulfonic acids Chemical class 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- 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
Landscapes
- Sewage (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、コンクリート構造物の補修、特に硫酸により劣化を受けた下水処理施設のコンクリート構造物の補修などに使用するアルミナセメント組成物およびそれを用いた補修工法に関する。 The present invention relates to an alumina cement composition used for repairing a concrete structure, particularly repairing a concrete structure of a sewage treatment facility that has been deteriorated by sulfuric acid, and a repair method using the same.
下水処理施設におけるコンクリート構造物は、下水中で発生する硫酸還元細菌の影響で硫酸が発生しコンクリートが侵食され、さらに内部の鉄筋の腐食で錆による膨張圧が生じ、コンクリートにひび割れ、浮きが発生し、コンクリート片のはく落などが起きている。このような下水処理施設での補修工法としては、劣化部をウォータージェットにより除去し断面修復してから樹脂ライニングを行う方法が多く実施されている。これに用いる断面修復材は、高炉水砕スラグにポリマーを配合した材料（特許文献１）、アルミナセメントからなる材料（特許文献２、３）、高炉水砕スラグやシリカフュームなどの微粉末を多量に混和したセメントモルタルが使用されている（特許文献４）。また、アルミナセメントと高炉スラグ微粉末を用いた材料で、５μｍ以下のアルミナセメント粒子を２５重量％以下とし、リチウム塩を含有する材料が提案されている（特許文献５）。
しかしながら、硫酸によるコンクリート構造物の劣化は、セメントの水和で生じる水酸化カルシウムと硫酸が反応することで進行するため、通常のポルトランドセメントを用いた補修材料では樹脂ライニングにわずかなピンホールが存在すれば長期的な耐久性は望めないという課題があった。また、下水処理施設には、湿度が低く風通りのよい開放されたピットや水路なども存在し、冬季の寒い時期の施工では、セメントの凝結時間が遅れるため初期収縮ひび割れが発生しやすいという課題があった。さらに、微粉末を多量に混和した材料は、自己収縮がポリマーセメントよりも大きく、冬季に限らず初期ひび割れが発生しやすく、モルタルの粘りが強く作業性が悪いという課題があった。
本発明者らは、前記課題を解決するため、特定のアルミナセメント組成物およびそれを用いた補修工法を提供する。
However, the deterioration of concrete structures due to sulfuric acid proceeds due to the reaction of calcium hydroxide and sulfuric acid generated by cement hydration, so there is a slight pinhole in the resin lining in repair materials using ordinary Portland cement. Then, there was a problem that long-term durability could not be expected. In addition, sewage treatment facilities have open pits and waterways with low humidity and good wind passage, and in the cold season of winter, the setting time of cement is delayed, so initial shrinkage cracks are likely to occur. was there. Furthermore, a material in which a large amount of fine powder is mixed has a problem that self-shrinkage is larger than that of polymer cement, initial cracking is likely to occur not only in winter, but mortar has a strong stickiness and workability is poor.
In order to solve the above problems, the present inventors provide a specific alumina cement composition and a repair method using the same.
すなわち、本発明は、（１）アルミナセメント、ポゾラン物質、およびＬｉ２Ｏ含有量が０．７〜２．５質量％のヘクトライトを含有するアルミナセメント組成物、（２）高分子繊維を含有する（１）のアルミナセメント組成物、（３）高分子繊維の繊維長が２〜１５ｍｍでアスペクト比が３００〜１０００である（２）のアルミナセメント組成物、（４）流動化剤を含有する（１）〜（３）のいずれかのアルミナセメント組成物、（５）セメント混和用ポリマーを含有する（１）〜（４）のいずれかのアルミナセメント組成物、（６）吸水防止剤を含有する（１）〜（５）のいずれかのアルミナセメント組成物、（７）骨材を含有する（１）〜（６）のいずれかのアルミナセメント組成物、（８）（１）〜（７）のいずれかのアルミナセメント組成物を用いるコンクリート構造物の補修工法、である。 That is, the present invention comprises (1) an alumina cement composition containing an alumina cement, a pozzolanic material, and a hectorite having a Li 2 O content of 0.7 to 2.5 mass%, and (2) containing a polymer fiber. (1) Alumina cement composition of (1), (3) Alumina cement composition of (2) having a fiber length of 2 to 15 mm and an aspect ratio of 300 to 1000, and (4) a fluidizing agent. (1) to (3) any one alumina cement composition, (5) containing cement admixture polymer (1) to (4) any alumina cement composition, (6) containing water absorption inhibitor The alumina cement composition according to any one of (1) to (5), (7) the alumina cement composition according to any one of (1) to (6), containing an aggregate, (8) (1) to (7 Alumina A repairing method, the concrete structure using a cement composition.
本発明のアルミナセメント組成物およびそれを用いた補修工法により、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性などに優れ、長期耐久性が良好なコンクリート構造物の補修を行うことが可能となる。 Repair of concrete structures excellent in workability, low-temperature curing properties, initial crack resistance, strength development, sulfuric acid resistance, etc., and long-term durability by the alumina cement composition of the present invention and the repair method using the same Can be performed.
以下、本発明を詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明で使用するアルミナセメントとは、モノカルシウムアルミネートを主要鉱物として含有するクリンカー粉砕物から得られるものであり、例えば、アルミナセメント１号やアルミナセメント２号などが使用できる。アルミナセメントの粉末度は、水和活性の点で２０００〜８０００ｃｍ２／ｇが好ましい。また、アルミナセメントの粒度調整を行い、粒子径５μｍ以下の粒子を全体の３０質量％未満としたものが硬化するときの収縮が小さくなるので好ましい。 The alumina cement used in the present invention is obtained from a clinker pulverized product containing monocalcium aluminate as a main mineral. For example, alumina cement 1 or alumina cement 2 can be used. The fineness of the alumina cement is preferably 2000 to 8000 cm 2 / g in terms of hydration activity. Moreover, the particle size of the alumina cement is adjusted, and particles having a particle diameter of 5 μm or less and less than 30% by mass are preferable because shrinkage when cured is reduced.
本発明で使用するポゾラン物質とは、アルカリ刺激によりポゾラン活性を示す物質であり、アルミナセメントと併用することで、水和物の相転移による強度低下を抑制する目的や、施工時のモルタルのダレ抵抗性を向上させる目的で使用するものである。例えば、高炉水砕スラグ、高炉徐冷スラグ、転炉スラグ、シリカフューム、およびフライアッシュなどが挙げられる。
ポゾラン物質の粉末度は、水和活性の点でブレーン比表面積３０００ｃｍ２／ｇ以上が好ましい。
ポゾラン物質の使用量は、通常、アルミナセメント１００質量部に対して、８０〜２００質量部が好ましく、１００〜１５０質量部がより好ましい。なお、シリカフュームは、アルミナセメント１００質量部に対して１〜１０質量部が好ましい。
The pozzolanic substance used in the present invention is a substance that exhibits pozzolanic activity by alkali stimulation, and is used in combination with alumina cement for the purpose of suppressing strength reduction due to phase transition of hydrate, and dripping of mortar during construction. It is used for the purpose of improving resistance. Examples include blast furnace granulated slag, blast furnace slow-cooled slag, converter slag, silica fume, fly ash, and the like.
The fineness of the pozzolanic material is preferably a brane specific surface area of 3000 cm 2 / g or more in terms of hydration activity.
Usually, the amount of the pozzolanic material is preferably 80 to 200 parts by mass and more preferably 100 to 150 parts by mass with respect to 100 parts by mass of the alumina cement. Silica fume is preferably 1 to 10 parts by mass with respect to 100 parts by mass of alumina cement.
本発明で使用するＬｉ２Ｏ（酸化リチウム）含有量が０．７〜２．５質量％のヘクトライトとは、スメクタイト類に属する粘土鉱物の一種であり、層状構造を有している。特徴としては、その層間には水分子を伴った種々の金属イオンが入っており、層間の金属イオンが交換性を有している。ヘクトライトの場合は、リチウムを含有するのが特徴である。ヘクトライトのＬｉ２Ｏ含有量は０．７〜２．５質量％が好ましく、０．７質量％未満では低温での硬化促進効果が小さく、２．５質量％を超えると流動性に影響する場合がある。ヘクトライトの従来の用途は、チクソ性を有することからセメント系材料のレオロジー特性を改善する目的で使用されているが、アルミナセメント系材料に適用すると、低温時の硬化性状が改善する。
ヘクトライトの使用量は、アルミナセメント１００質量部に対して０．１〜１０質量部が好ましく、０．３〜５質量部がより好ましい。０．１質量部未満では低温での硬化促進効果が小さく、１０質量部を超えると硬化が早くなりすぎモルタルの流動性に影響する場合がある。
Hectorite having a Li 2 O (lithium oxide) content of 0.7 to 2.5% by mass used in the present invention is a kind of clay mineral belonging to smectites and has a layered structure. Characteristically, various metal ions with water molecules are contained between the layers, and the metal ions between the layers have exchangeability. Hectorite is characterized by containing lithium. The Li 2 O content of hectorite is preferably 0.7 to 2.5% by mass. If it is less than 0.7% by mass, the effect of promoting curing at low temperatures is small, and if it exceeds 2.5% by mass, the fluidity is affected. There is a case. Although the conventional use of hectorite has thixotropy, it is used for the purpose of improving the rheological properties of cementitious materials. However, when applied to alumina cementitious materials, the curing properties at low temperatures are improved.
0.1-10 mass parts is preferable with respect to 100 mass parts of alumina cement, and, as for the usage-amount of hectorite, 0.3-5 mass parts is more preferable. If it is less than 0.1 parts by mass, the effect of promoting curing at low temperatures is small, and if it exceeds 10 parts by mass, curing may become too fast and affect the fluidity of the mortar.
本発明で使用する高分子繊維とは、アルミナセメントが硬化するときの収縮による大きなひび割れを抑制する目的で使用する。高分子繊維の種類としては、ビニロン繊維、ポリプロピレン繊維、アクリル繊維、ナイロン繊維などが挙げられる。特に限定されるものではないが、これらの中でモルタル中における繊維の付着力が比較的優れるビニロン繊維やアクリル繊維の使用が好ましい。特に、繊維長が２〜１５ｍｍでアスペクト比が３００〜１０００の高分子繊維が硬化するときの収縮で入る大きなひび割れを抑制するのに好ましい。
高分子繊維の使用量は、アルミナセメントとポゾラン物質とヘクトライトと骨材の合計１００質量部に対して０．０２〜０．６質量部が好ましく、０．０５〜０．４質量部がより好ましい。０．０２質量部未満では、ひび割れ抑制効果が小さく、０．６質量部を超えるとモルタルの流動性に影響する場合がある。
The polymer fiber used in the present invention is used for the purpose of suppressing large cracks due to shrinkage when the alumina cement is cured. Examples of the polymer fiber include vinylon fiber, polypropylene fiber, acrylic fiber, and nylon fiber. Although not particularly limited, it is preferable to use vinylon fibers or acrylic fibers, which have relatively good fiber adhesion in mortar. In particular, it is preferable for suppressing large cracks caused by shrinkage when polymer fibers having a fiber length of 2 to 15 mm and an aspect ratio of 300 to 1000 are cured.
The amount of the polymer fiber used is preferably 0.02 to 0.6 parts by mass, more preferably 0.05 to 0.4 parts by mass with respect to 100 parts by mass in total of the alumina cement, pozzolanic substance, hectorite and aggregate. preferable. If it is less than 0.02 parts by mass, the effect of suppressing cracking is small, and if it exceeds 0.6 parts by mass, it may affect the fluidity of the mortar.
本発明で使用する流動化剤は、モルタルに適度な流動性を与える目的で使用するものであり、例えば、ポリカルボン酸系化合物、メラミン系化合物、リグニンスルホン酸系化合物、ナフタレンスルホン酸系化合物などが挙げられる。これらの中で、適度な流動性を与え、強度発現性に影響を与えにくい点でポリカルボン酸系化合物、メラミン系化合物の使用が好ましい。
流動化剤の使用量は、アルミナセメント１００質量部に対して０．０１〜１質量部が好ましく、０．０５〜０．５質量部がより好ましい。０．０１質量部未満では、適度な流動性を与えにくく、１質量部を超えると強度発現性に影響する場合がある。
The fluidizing agent used in the present invention is used for the purpose of imparting appropriate fluidity to the mortar, such as polycarboxylic acid compounds, melamine compounds, lignin sulfonic acid compounds, naphthalene sulfonic acid compounds, and the like. Is mentioned. Among these, it is preferable to use a polycarboxylic acid compound or a melamine compound from the viewpoint of giving appropriate fluidity and hardly affecting the strength development.
The amount of the fluidizing agent used is preferably 0.01 to 1 part by mass and more preferably 0.05 to 0.5 part by mass with respect to 100 parts by mass of the alumina cement. If it is less than 0.01 part by mass, it is difficult to give an appropriate fluidity, and if it exceeds 1 part by mass, strength development may be affected.
本発明で使用するセメント混和用ポリマーは、ＪＩＳ Ａ ６２０３で規定されているセメント混和用のポリマー（ポリマーディスパージョン）であり、中性化、塩害、凍害などの耐久性を向上させ、モルタルの付着強度、曲げ強度、引張強度などの強度特性を改善する目的で使用する。例えば、アクリロニトリル・ブタジエンゴム、スチレン・ブタジエンゴム、クロロプレンゴム、および天然ゴムなどのゴムラテックス、エチレン・酢酸ビニル共重合体、ポリアクリル酸エステル、酢酸ビニルビニルバーサテート系共重合体、およびスチレン・アクリル酸エステル共重合体やアクリロニトリル・アクリル酸エステルに代表されるアクリル酸エステル系共重合体、エポキシ樹脂、不飽和ポリエステル樹脂に代表される液状ポリマーなどが挙げられ、これらの１種または２種以上の混合物を使用できる。
セメント混和用ポリマーの使用量は、アルミナセメント１００質量部に対して固形分で０．５〜２０質量部が好ましく、２〜１５質量部がより好ましい。０．５質量部未満では耐久性の向上効果が小さく、２０質量部を超えると強度発現性に影響する場合がある。
The cement-mixing polymer used in the present invention is a cement-mixing polymer (polymer dispersion) defined in JIS A 6203, which improves the durability of neutralization, salt damage, frost damage, etc., and adheres to mortar. Used to improve strength properties such as strength, bending strength, and tensile strength. For example, rubber latex such as acrylonitrile-butadiene rubber, styrene-butadiene rubber, chloroprene rubber, and natural rubber, ethylene-vinyl acetate copolymer, polyacrylate ester, vinyl acetate vinyl versatate copolymer, and styrene-acrylic Examples include acid ester copolymers, acrylic ester copolymers represented by acrylonitrile / acrylic acid esters, epoxy resins, liquid polymers represented by unsaturated polyester resins, and the like. Mixtures can be used.
The amount of the cement-mixing polymer used is preferably 0.5 to 20 parts by mass, more preferably 2 to 15 parts by mass, based on 100 parts by mass of the alumina cement. If it is less than 0.5 part by mass, the effect of improving the durability is small, and if it exceeds 20 parts by mass, the strength development may be affected.
本発明で使用する吸水防止剤とは、硬化したモルタルの吸水性を低下させる目的で使用するものであり、水分中に溶け込んでいる硫酸イオンの浸透を抑制する効果がある。例えば、ステアリン酸カルシウムなどの高級脂肪酸系化合物や、パラフィン、アルキルアルコキシシランなどのシラン類がある。これらの中で、モルタルの流動性に悪影響を与えにくく、撥水効果が大きい点でシラン系吸水防止剤の使用が好ましい。また、液状及び粉末状いずれも使用できるが、予めプレミックスできる粉末状の吸水防止剤の使用が好ましい。
吸水防止剤の使用量は、アルミナセメント１００質量部に対して０．２〜８質量部が好ましく、０．５〜５質量部がより好ましい。０．２質量部未満では、硫酸イオンの浸透抑制効果が小さく、８質量部を超えると強度発現性に影響する場合がある。
The water absorption inhibitor used in the present invention is used for the purpose of lowering the water absorption of the cured mortar, and has an effect of suppressing permeation of sulfate ions dissolved in moisture. For example, there are higher fatty acid compounds such as calcium stearate and silanes such as paraffin and alkylalkoxysilane. Among these, the use of a silane-based water absorption inhibitor is preferable because it hardly affects the fluidity of the mortar and has a large water-repellent effect. Both liquid and powder can be used, but it is preferable to use a powdery water absorption inhibitor that can be premixed in advance.
0.2-8 mass parts is preferable with respect to 100 mass parts of alumina cement, and, as for the usage-amount of a water absorption inhibitor, 0.5-5 mass parts is more preferable. If the amount is less than 0.2 parts by mass, the effect of suppressing the permeation of sulfate ions is small. If the amount exceeds 8 parts by mass, the strength development may be affected.
本発明のアルミナセメント組成物は、水と混合し、骨材を含まないペースト、あるいは骨材を含むモルタルやコンクリートとして使用できるが、使用する骨材の種類としては、特に限定されるものではないが、耐酸性を有する骨材の使用が好ましい。例えば、珪石骨材、アルミナ骨材、ムライト骨材、シャモット骨材、炭化珪素骨材、アルミナセメントクリンカー骨材などが挙げられる。
骨材の使用量は、アルミナセメントとポゾラン物質とヘクトライトの合計１００質量部に対して０〜２５０質量部が好ましく、２５０質量部を超えると流動性や付着強度が低下する傾向がある。また、２ｍｍ以下の薄塗りをする場合は骨材を含まないペーストを使用し、２ｍｍを超える厚みを確保する場合は骨材を含むモルタルやコンクリートを使用することが好ましい。
The alumina cement composition of the present invention can be mixed with water and used as a paste containing no aggregate, or as a mortar or concrete containing aggregate, but the type of aggregate to be used is not particularly limited. However, it is preferable to use an aggregate having acid resistance. Examples thereof include silica aggregate, alumina aggregate, mullite aggregate, chamotte aggregate, silicon carbide aggregate, alumina cement clinker aggregate, and the like.
The amount of the aggregate used is preferably 0 to 250 parts by mass with respect to 100 parts by mass in total of the alumina cement, the pozzolanic substance, and hectorite, and if it exceeds 250 parts by mass, the fluidity and adhesion strength tend to decrease. Moreover, it is preferable to use the paste which does not contain an aggregate when thinly coating 2 mm or less, and to use the mortar and concrete containing an aggregate when ensuring the thickness exceeding 2 mm.
本発明では、低温においてより迅速な強度発現が必要な場合は、炭酸、硫酸、ケイ酸、硝酸、水酸化物、リン酸、ホウ酸、有機酸などのリチウム塩を併用することができる。
また、本発明のアルミナセメント組成物には品質に悪影響を与えない範囲でＡＥ剤、増粘剤、発泡剤、凝結遅延剤、防凍剤、収縮低減剤、抗菌剤などの各種添加剤を併用することができる。
In the present invention, when more rapid strength development is required at a low temperature, lithium salts such as carbonic acid, sulfuric acid, silicic acid, nitric acid, hydroxide, phosphoric acid, boric acid and organic acid can be used in combination.
The alumina cement composition of the present invention is used in combination with various additives such as an AE agent, a thickener, a foaming agent, a setting retarder, an antifreezing agent, a shrinkage reducing agent, and an antibacterial agent as long as the quality is not adversely affected. be able to.
本発明のアルミナセメント組成物の補修方法は、ミキサーで練り混ぜたモルタルをコテで塗ってもよく、型枠を作りその内部に充填してもよく、圧縮空気を用いてモルタルを吹き飛ばす吹付けで施工してもよい。 The repair method of the alumina cement composition of the present invention may be a mortar kneaded with a mixer, coated with a trowel, filled into a mold, or sprayed by blowing off the mortar using compressed air. You may construct.
以下、実施例で詳細に説明する。 Examples will be described in detail below.
アルミナセメント１００質量部に対してポゾラン物質Ａ１２０質量部、表１に示すＬｉ２Ｏ含有量のヘクトライトを０．３質量部加えた配合物を調製し、この配合物１００質量部に対して骨材１７０質量部加えドライモルタルとし、このドライモルタル１００質量部に対して水を１６質量部加えたモルタルのフロー、始発時間、初期ひび割れ抵抗性、圧縮強度、耐硫酸性を測定した。その結果を表１に示す。 A compound was prepared by adding 120 parts by mass of pozzolanic material A to 100 parts by mass of alumina cement and 0.3 parts by mass of hectorite having the Li 2 O content shown in Table 1. 170 parts by mass of the material was added to form dry mortar, and the flow, initial time, initial crack resistance, compressive strength, and sulfuric acid resistance of the mortar obtained by adding 16 parts by mass of water to 100 parts by mass of the dry mortar were measured. The results are shown in Table 1.
（使用材料）
アルミナセメント：アルミナセメント１号、市販品
ポゾラン物質Ａ：高炉水砕スラグ微粉末、ブレーン比表面積７０００ｃｍ２／ｇ、市販品
ヘクトライト：密度２．６ｇ／ｃｍ３、最大粒子径１００μｍ、市販品
モンモリロナイト：密度２．７ｇ／ｃｍ３、最大粒子径１５０μｍ、市販品
骨材：乾燥珪砂、最大粒径１．２ｍｍ
(Materials used)
Alumina cement: Alumina cement No. 1, commercial product pozzolanic substance A: ground granulated blast furnace slag, Blaine specific surface area 7000 cm 2 / g, commercial product hectorite: density 2.6 g / cm 3 , maximum particle size 100 μm, commercial product montmorillonite : Density 2.7 g / cm 3 , maximum particle size 150 μm, commercial product aggregate: dry silica sand, maximum particle size 1.2 mm
（測定方法）
フロー試験、圧縮強度試験：ＪＩＳ Ｒ ５２０１に準拠して測定した。
始発時間：ＪＩＳ Ａ １１４７に準拠して測定した（試験温度５℃）。
初期ひび割れ抵抗性：練り混ぜたモルタルを縦３０ｃｍm×横３０ｃｍ×厚さ６ｃｍのコンクリート製平板に厚さ１０ｍｍとなるようにコテで塗り付け、温度５℃、湿度４０％、平均風速：２ｍ／ｓの空間に放置し、１日後のひび割れ全長さを測定した。
耐硫酸性試験：練り混ぜたモルタルをφ７．５×１５ｃｍに成形し、温度２０℃の水中に２８日間養生後、温度２０℃で５％硫酸水溶液中に２８日間浸漬したときの硫酸イオンの浸透深さを測定した。浸透深さの判定はフェノールフタレイン法で行った。
(Measuring method)
Flow test, compressive strength test: Measured according to JIS R 5201.
First time: Measured according to JIS A 1147 (test temperature 5 ° C.).
Initial crack resistance: Kneaded mortar is applied to a concrete flat plate with a length of 30 cm x width 30 cm x thickness 6 cm to a thickness of 10 mm, temperature 5 ° C, humidity 40%, average wind speed: 2 m / s The total length of cracks after one day was measured.
Sulfuric acid resistance test: Kneaded mortar formed into φ7.5 × 15 cm, cured for 28 days in water at a temperature of 20 ° C., and then immersed in a 5% aqueous sulfuric acid solution at a temperature of 20 ° C. for 28 days. The depth was measured. The penetration depth was determined by the phenolphthalein method.
表１より、本発明のアルミナセメント組成物は、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性に優れ、本発明の範囲外のＬｉ２Ｏ含有量のヘクトライトでは流動性が低下し、モンモリロナイトでは初期ひび割れ抵抗性が低下することが判る。 From Table 1, the alumina cement composition of the present invention is excellent in workability, low-temperature curing property, initial crack resistance, strength development, and sulfuric acid resistance, and in the case of hectorite having a Li 2 O content outside the scope of the present invention. It can be seen that the fluidity decreases, and the initial cracking resistance decreases with montmorillonite.
実施例１の実験No.1-3において、アルミナセメント１００質量部に対してヘクトライトの使用量を表２に示すように変えたこと以外は実施例１と同様に行った。その結果を表２に示す。 In Experiment No. 1-3 of Example 1, it carried out like Example 1 except having changed the usage-amount of hectorite as shown in Table 2 with respect to 100 mass parts of alumina cements. The results are shown in Table 2.
表２より、本発明のアルミナセメント組成物は、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性に優れ、ヘクトライトにより初期ひび割れ抵抗性が向上することが判る。 From Table 2, it can be seen that the alumina cement composition of the present invention is excellent in workability, low-temperature curing property, initial crack resistance, strength development, and sulfuric acid resistance, and the initial crack resistance is improved by hectorite.
実施例１の実験No.1-3において、ポゾラン物質の種類と量を表３に示すように変えたこと以外は実施例１と同様に行った。その結果を表３に示す。 In Experiment No. 1-3 of Example 1, the same procedure as in Example 1 was performed except that the kind and amount of the pozzolanic substance were changed as shown in Table 3. The results are shown in Table 3.
（使用材料）
ポゾラン物質Ｂ：フライアッシュ、ブレーン比表面積４５００ｃｍ２／ｇ、市販品
ポゾラン物質Ｃ：シリカフューム、平均粒子径０．１〜０．２μｍ、市販品
(Materials used)
Pozzolanic material B: fly ash, Blaine specific surface area 4500 cm 2 / g, commercial product pozzolanic material C: silica fume, average particle size 0.1-0.2 μm, commercial product
表３より、本発明のアルミナセメント組成物は、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性に優れ、ポゾラン物質により強度発現性や耐硫酸性が向上することが判る。 From Table 3, the alumina cement composition of the present invention is excellent in workability, low-temperature curability, initial crack resistance, strength development, and sulfuric acid resistance, and the pozzolanic substance improves strength development and sulfuric acid resistance. I understand.
実施例１の実験No.1-3において、ドライモルタル１００質量部に対して高分子繊維を表４に示すように加えたこと以外は実施例１と同様に行った。その結果を表４に示す。 In Experiment No. 1-3 of Example 1, it carried out like Example 1 except having added polymer fiber as shown in Table 4 with respect to 100 mass parts of dry mortar. The results are shown in Table 4.
（使用材料）
高分子繊維Ａ：ポリプロピレン繊維、繊維長１２ｍｍ、繊維径１８μｍ、アスペクト比６６７、市販品
高分子繊維Ｂ：ビニロン繊維、繊維長６ｍｍ、繊維径１４μｍ、アスペクト比４２９、市販品
(Materials used)
Polymer fiber A: polypropylene fiber, fiber length 12 mm, fiber diameter 18 μm, aspect ratio 667, commercially available polymer fiber B: vinylon fiber, fiber length 6 mm, fiber diameter 14 μm, aspect ratio 429, commercially available product
表４より、本発明のアルミナセメント組成物は、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性に優れ、高分子繊維を使用することにより初期ひび割れ抵抗性が向上することが判る。 From Table 4, the alumina cement composition of the present invention is excellent in workability, low-temperature curing properties, initial crack resistance, strength development, and sulfuric acid resistance, and the initial crack resistance is improved by using polymer fibers. I understand that.
実施例１の実験No.1-3において、アルミナセメント１００質量部に対して流動化剤を表５に示すように加え配合物を調製し、ドライモルタル１００質量部に対して水を１４．５質量部、実施例４で使用した高分子繊維Ｂ０．１質量部を加えたこと以外は実施例１と同様に行った。その結果を表５に示す。 In Experiment No. 1-3 of Example 1, a blending agent was prepared by adding a fluidizing agent to 100 parts by mass of alumina cement as shown in Table 5, and 14.5% of water was added to 100 parts by mass of dry mortar. The same procedure as in Example 1 was performed except that 0.1 part by mass of polymer fiber B used in Example 4 was added. The results are shown in Table 5.
（使用材料）
流動化剤Ａ：メチロールメラミン系化合物、市販品
流動化剤Ｂ：ポリカルボン酸系流動化剤、粉末、市販品
(Materials used)
Fluidizer A: Methylolmelamine compound, commercially available fluidizer B: Polycarboxylic acid fluidizer, powder, commercially available product
表５より、本発明のアルミナセメント組成物は、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性に優れ、流動化剤を使用することによりモルタルの流動性が向上することが判る。 From Table 5, the alumina cement composition of the present invention is excellent in workability, low-temperature curing properties, initial crack resistance, strength development, and sulfuric acid resistance, and the fluidity of the mortar is improved by using a fluidizing agent. I understand that.
実施例５の実験No.5-5において、アルミナセメント１００質量部に対してセメント混和用ポリマー（固形分換算）を表６に示すように加え配合物を調製し、このドライモルタル１００質量部に対して水を１４．５質量部、実施例４で使用した高分子繊維Ｂ０．１質量部を加えたこと以外は実施例１と同様に行った。その結果を表６に示す。 In Experiment No. 5-5 of Example 5, a blending polymer was prepared by adding a cement-mixing polymer (in terms of solid content) to 100 parts by mass of alumina cement as shown in Table 6, and into 100 parts by mass of this dry mortar. On the other hand, it carried out like Example 1 except having added 14.5 mass parts of water and 0.1 mass part of polymer fiber B used in Example 4. The results are shown in Table 6.
（使用材料）
セメント混和用ポリマー：アクリル−スチレン系再乳化型粉末樹脂、市販品
(Materials used)
Cement admixture polymer: Acrylic-styrene re-emulsifying powder resin, commercial product
表６より、本発明のアルミナセメント組成物は、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性に優れ、セメント混和用ポリマーを使用することにより作業性や耐硫酸性が向上することが判る。 From Table 6, the alumina cement composition of the present invention is excellent in workability, low-temperature curing properties, initial crack resistance, strength development, and sulfuric acid resistance. By using a cement-mixing polymer, the workability and sulfuric acid resistance are improved. Can be seen to improve.
実施例５の実験No.5-5において、アルミナセメント１００質量部に対して吸水防止剤と実施例６で使用したセメント混和用ポリマーの使用量を表７に示すように変え配合物を調製したこと以外は実施例６と同様に行った。その結果を表７に示す。 In Experiment No. 5-5 of Example 5, a blend was prepared by changing the amounts of the water absorption inhibitor and the cement-mixing polymer used in Example 6 to 100 parts by mass of alumina cement as shown in Table 7. Except that, the same procedure as in Example 6 was performed. The results are shown in Table 7.
（使用材料）
吸水防止剤：粉末アルキルアルコキシシラン系吸水防止剤、市販品
(Materials used)
Water absorption inhibitor: Powdered alkylalkoxysilane water absorption inhibitor, commercial product
表７より、本発明のアルミナセメント組成物は、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性に優れ、吸収防止剤とセメント混和用ポリマーを使用することにより耐硫酸性が向上することが判る。 From Table 7, the alumina cement composition of the present invention is excellent in workability, low-temperature curing properties, initial crack resistance, strength development, and sulfuric acid resistance, and is resistant to sulfuric acid by using an absorption inhibitor and a cement admixing polymer. It can be seen that the performance is improved.
実施例６の実験No.6-4において、骨材の使用量を表８に示すように変え付着強度を測定したこと以外は実施例６と同様に行った。その結果を表８に示す。 In Experiment No. 6-4 of Example 6, the same procedure as in Example 6 was performed except that the amount of aggregate used was changed as shown in Table 8 and the adhesion strength was measured. The results are shown in Table 8.
（付着強度）
ＪＩＳ Ａ １１７１に準拠して測定した。
(Adhesion strength)
Measurement was performed in accordance with JIS A 1171.
表８より、本発明のアルミナセメント組成物は、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性に優れ、骨材の使用量により付着強度が変わることが判る。 From Table 8, it can be seen that the alumina cement composition of the present invention is excellent in workability, low-temperature curing property, initial crack resistance, strength development, and sulfuric acid resistance, and the adhesion strength varies depending on the amount of aggregate used.
実施例１の実験No.1-3、実施例５の実験No.5-5、実施例６の実験No.6-4のアルミナセメント組成物のモルタルを気温５℃、湿度４０％にコントロールした部屋で天井面に設置したコンクリート板に厚さ２０ｍｍとなるようにコテ塗りした（コテ塗り面積：０．５ｍ２程度）。その結果、コテ塗りの作業性は良好であり、１回で厚さ２０ｍｍとなるように塗り付けてもはく落は無かった。また、１日後に打音検査を行ったところ浮きも認められなかった。さらに、材齢７日に実施例８と同様に付着強度試験を行ったところ、実施例１の実験No.1-3のモルタルで２．０Ｎ／ｍｍ２、実施例５の実験No.5-5のモルタルで２．３Ｎ／ｍｍ２、実施例６の実験No.6-4のモルタルで２．４Ｎ／ｍｍ２と高い付着力を示した。 Experiment 1 No. 1-3 of Example 1, Experiment No. 5-5 of Example 5 and Mortar of the alumina cement composition of Experiment No. 6-4 of Example 6 were controlled at a temperature of 5 ° C. and a humidity of 40%. A concrete plate placed on the ceiling surface in the room was coated with a iron so that the thickness was 20 mm (coating area: about 0.5 m 2 ). As a result, the workability of the trowel application was good, and even if it was applied so that the thickness became 20 mm at a time, there was no peeling. Further, when a hammering test was conducted one day later, no floating was observed. Furthermore, when the adhesion strength test was performed on the 7th day of age in the same manner as in Example 8, it was 2.0 N / mm 2 in the mortar of Experiment No. 1-3 in Example 1, and in Experiment No. 5- in Example 5. The mortar of 5 showed 2.3 N / mm 2 , and the mortar of Experiment No. 6-4 of Example 6 showed high adhesion of 2.4 N / mm 2 .
本発明のアルミナセメント組成物およびそれを用いた補修工法により、作業性、低温硬化性状、初期ひび割れ抵抗性、強度発現性、耐硫酸性などに優れ、長期耐久性が良好なコンクリート構造物の補修を行うことが可能となるので、下水処理施設などの土木分野などで幅広く適用できる。 Repair of concrete structures excellent in workability, low-temperature curing properties, initial crack resistance, strength development, sulfuric acid resistance, etc., and long-term durability by the alumina cement composition of the present invention and the repair method using the same Therefore, it can be widely applied in civil engineering fields such as sewage treatment facilities.
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