JP5514790B2 - Acid-resistant dry-type mortar material and method for producing the spray material - Google Patents
Acid-resistant dry-type mortar material and method for producing the spray material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims description 74
- 239000004570 mortar (masonry) Substances 0.000 title claims description 47
- 239000002253 acid Substances 0.000 title claims description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000007921 spray Substances 0.000 title description 32
- 238000005507 spraying Methods 0.000 claims description 48
- 239000000843 powder Substances 0.000 claims description 45
- 239000000203 mixture Substances 0.000 claims description 42
- 239000004568 cement Substances 0.000 claims description 37
- 239000004815 dispersion polymer Substances 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 19
- 239000002893 slag Substances 0.000 claims description 19
- 229920000642 polymer Polymers 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000002734 clay mineral Substances 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 11
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 10
- 239000000428 dust Substances 0.000 description 20
- 238000011156 evaluation Methods 0.000 description 15
- 239000004567 concrete Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 238000010276 construction Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000004576 sand Substances 0.000 description 6
- 239000010865 sewage Substances 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 229920000058 polyacrylate Polymers 0.000 description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- -1 alkali metal salt Chemical class 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004113 Sepiolite Substances 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 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 description 1
- 229910000271 hectorite Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229910052624 sepiolite Inorganic materials 0.000 description 1
- 235000019355 sepiolite Nutrition 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 230000007704 transition Effects 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
Description
本発明は、耐酸性乾式吹付け用モルタル材料及び該耐酸性乾式吹付け用モルタル材料の製造方法に関し、特に、下水処理施設等の酸性雰囲気に晒されるコンクリート構造物に利用される乾式吹付け用モルタル材料における耐酸性を向上させ、粉塵の発生の低減を図り、かつリバウンド率が低く、乾式吹付け工法に用いる際の粉体圧送性を安定させる、耐酸性乾式吹付け用モルタル材料及び該吹付け材料の製造方法に関するものである。 The present invention relates to an acid-resistant dry-type mortar material and a method for producing the acid-resistant dry-type mortar material, and particularly to a dry-type spray used for a concrete structure exposed to an acidic atmosphere such as a sewage treatment facility. An acid-resistant dry spray mortar material that improves acid resistance in mortar materials, reduces dust generation, has a low rebound rate, and stabilizes powder pumpability when used in a dry spray method. The present invention relates to a method for manufacturing an adhesive material.
近年、下水処理コンクリート施設等では、コンクリート構造物が酸性雰囲気に晒されており、該コンクリート構造物が浸食して劣化する現象が生じていた。
これに対して、下水処理コンクリート施設を防食ライニングにより補修する工法が試みられており、防食塗装が標準仕様となっている。
In recent years, in sewage treatment concrete facilities and the like, concrete structures have been exposed to an acidic atmosphere, and the concrete structures have been eroded and deteriorated.
On the other hand, a method of repairing a sewage treatment concrete facility with an anticorrosion lining has been attempted, and anticorrosion coating has become a standard specification.
ライニング工法は、コンクリート構造物を断面修復して補修した上に、表面被覆を行なうことで補修する工法である。
しかし工程が複雑であり、工期が長期的になるため、下水処理施設を停止しなければならず、その場合には仮設備の手配等も必要となるため、工期が長くなるほど経済的負担が大きくなっている。
The lining method is a method in which a concrete structure is repaired by repairing the cross section and then surface covering.
However, since the process is complicated and the construction period is long, the sewage treatment facility must be stopped. In that case, provisional equipment must be arranged, so the longer the construction period, the greater the economic burden. It has become.
例えば、特開２００２−１３７９５４号公報（特許文献１）には、下水処理施設を補修するにあたり、耐酸性を向上させる材料として、（Ａ）アルミナセメント４０〜９０重量部、（Ｂ）スラグ微粉末１〜４０重量部、（Ｃ）最大粒径７０μｍ以下のフライアッシュ１〜３０重量部及び（Ｄ）アルカリ金属塩０．１〜６重量部を含有する水硬性組成物が記載されており、かかる水硬性組成物は、湿式吹付けに用いられる材料として開示されている。 For example, in JP-A-2002-137554 (Patent Document 1), (A) 40 to 90 parts by weight of alumina cement and (B) fine powder of slag as materials for improving acid resistance in repairing a sewage treatment facility A hydraulic composition containing 1 to 40 parts by weight, (C) 1 to 30 parts by weight of fly ash having a maximum particle size of 70 μm or less, and (D) 0.1 to 6 parts by weight of an alkali metal salt is described and applied. The hydraulic composition is disclosed as a material used for wet spraying.
また同様に、特開２００３−１９２４２２号公報（特許文献２）には、（Ａ）鉄を、Ｆｅ2Ｏ3換算で５重量％以上含むアルミナセメント２０〜８０重量％、及び（Ｂ）フライアッシュや高炉スラグ等の潜在水硬性物質２０〜８０重量％を含有する無機系水硬性組成物が開示されており、かかる水硬性組成物は湿式吹付けに用いられる材料として開示されている。 Similarly, Japanese Patent Application Laid-Open No. 2003-192422 (Patent Document 2) describes (A) 20-80 wt% alumina cement containing 5 wt% or more of iron in terms of Fe 2 O 3 , and (B) fly ash. An inorganic hydraulic composition containing 20 to 80% by weight of a latent hydraulic substance such as blast furnace slag or the like is disclosed, and such a hydraulic composition is disclosed as a material used for wet spraying.
湿式吹付け工法は乾式吹付け工法と比較し、単位時間当たりの施工量が少なく、また一度に吹付けられる厚さが薄いため、特に厚い施工を求められる箇所では何層かに分けて吹付けるため工期の長期化が問題となる。 Compared with the dry spraying method, the wet spraying method requires less work per unit time and the thickness of sprayed at a time is thin. Therefore, the extension of the construction period becomes a problem.
一方、乾式吹付け工法に用いる乾式吹付け材料は、湿式吹付け工法に比べ単位時間当たりの施工量が多いことが大きな特徴であるが、吹付け施工時の粉塵発生量が多く、作業環境改善のための粉塵の低減が求められている。 On the other hand, the dry spray material used in the dry spray method is characterized by a large amount of construction per unit time compared to the wet spray method, but the amount of dust generated during spraying is large, improving the work environment. There is a need to reduce dust for the purpose.
乾式吹付け工法は、湿式吹付け工法と異なり、粉体材料を空気圧送して、吐出吹付けノズル中で加水し、これを高圧エアで吹付け面に吹付けるシステムである。吹付けノズルの加水から高圧のエアで噴射されるまでの時間が極端に短く、粉塵低減剤を添加した吹付けコンクリートやモルタルを用いて乾式吹付け工法を行っても、かかる時間内に粉塵を凝集、低減することができず、吹付け施工時の粉塵を低減する効果は十分でない。 Unlike the wet spraying method, the dry spraying method is a system in which a powder material is pneumatically fed and hydrated in a discharge spraying nozzle and sprayed onto the spraying surface with high-pressure air. The time from hydration of the spray nozzle to spraying with high-pressure air is extremely short, and even if the dry spray method is used with spray concrete or mortar to which a dust reducing agent is added, dust will be generated within that time. It cannot be aggregated and reduced, and the effect of reducing dust during spraying is not sufficient.
また、特開２０００−９６８２４号公報（特許文献３）には、セメント、細骨材、粉末エマルジョン、及び繊維の混合物を空気圧送し、吹付用ノズルの手前で該混合物に、水を添加混合し吹付けることを特徴とするモルタルの吹付工法が記載されており、細骨材は、吹付設備の圧送性の面から粒子径４ｍｍ以下が好ましいと記載されている。
しかし、かかる吹付け材料では、吹付け時の粉塵発生量を抑制することはできず、また、粒径が小さいことからホース内に材料が滞留する可能性があり、安定した粉体圧送、吹付けが困難である。
JP 2000-96824 A (Patent Document 3) pneumatically feeds a mixture of cement, fine aggregate, powder emulsion, and fiber, and adds water to the mixture before the spray nozzle. A mortar spraying method characterized by spraying is described, and it is described that the fine aggregate preferably has a particle diameter of 4 mm or less in terms of the pumpability of spraying equipment.
However, with such a spray material, the amount of dust generated during spraying cannot be suppressed, and since the particle size is small, there is a possibility that the material may stay in the hose. It is difficult to attach.
本発明の目的は、上記問題点に鑑みてなされたものであり、具体的には、耐酸性に優れ、吹付け時に発生する粉塵の低減及びリバウンド率を低減することができ、作業環境性に優れ、材料圧送性、吹付け安定性に優れ、圧縮強度に優れた、耐酸性乾式吹付け用モルタル材料を提供することである。
さらに本発明の他の目的は、上記本発明の耐酸性乾式吹付け用モルタル材料を有効に製造することができる、耐酸性乾式吹付け用モルタル材料の製造方法を提供することである。
The object of the present invention has been made in view of the above-mentioned problems. Specifically, it has excellent acid resistance, can reduce the dust generated during spraying and the rebound rate, and can improve the work environment. An object is to provide an acid-resistant dry-type mortar material that is excellent, excellent in material pumpability and spray stability, and excellent in compressive strength.
Furthermore, the other object of this invention is to provide the manufacturing method of the acid-resistant dry-type mortar material which can manufacture the acid-resistant dry-type mortar material of the said invention effectively.
本発明は、耐酸性を有する乾式吹付け用モルタル材料に関して種々研究を重ねた結果、セメントとしてカルシウムアルミネート系セメント及びスラグ粉末に加えて、配合する細骨材の粒子径や配合割合を特定範囲等とする粉体混合物とし、また、別途調製した液体物と混合することで、耐酸性を向上させ、吹付け施工時のリバウンド率を低下し、粉塵発生が低減できる等の課題を解決することを見出し、さらに温度履歴を受けても長期にわたり強度安定を維持できることを見出したものである。 As a result of various studies on acid-resistant dry spray mortar materials, the present invention has a specific range of particle sizes and blending ratios of fine aggregates to be blended in addition to calcium aluminate cement and slag powder as cement. To solve problems such as improving the acid resistance, reducing the rebound rate during spraying, and reducing dust generation by mixing with a liquid mixture prepared separately. Furthermore, it was found that the strength stability can be maintained over a long period of time even when subjected to a temperature history.
本発明の耐酸性乾式吹付け用モルタル材料は、カルシウムアルミネート系セメント、スラグ、粘土鉱物及び細骨材を含む粉体混合物と、ポリマーディスパージョン液とを含み、平均粒子径が１．２〜３．６ｍｍの細骨材であって、且つ前記細骨材中に粒子径５ｍｍ以上の細骨材を該粉体混合物中１〜１０質量％含み、ポリマー固形分／セメント質量比が１〜１５質量％であることを特徴とする。
好適には、前記本発明の耐酸性乾式吹付け用モルタル材料においては、さらにチクソ材を含むことを特徴とする。
The acid-resistant dry spray mortar material of the present invention includes a powder mixture containing calcium aluminate cement, slag , clay mineral and fine aggregate, and a polymer dispersion liquid, and has an average particle size of 1.2 to A fine aggregate of 3.6 mm , and the fine aggregate contains 1-10% by mass of fine aggregate having a particle diameter of 5 mm or more in the powder mixture, and the polymer solid content / cement mass ratio is 1-15. It is characterized by mass%.
Preferably, the in acid-resistant dry spraying mortar material of the present invention is characterized in that it comprises a switch shit material further.
また、本発明の耐酸性乾式吹付け用モルタルの製造方法は、平均粒子径が１．２〜３．６ｍｍの細骨材、カルシウムアルミネート系セメント、粘土鉱物及びスラグを混合して、前記細骨材中に粒子径５ｍｍ以上の細骨材を粉体混合物中１〜１０質量％含有される粉末混合物を調製し、別途、ポリマーと水とを混合してポリマーディスパージョン液を調製し、前記粉末混合物と前記ポリマーディスパージョン液とを、ポリマー固形分／セメント質量比が１〜１５質量％となるように配合することを特徴とする。 The manufacturing method of acid resistance dry spraying mortar of the invention, fine aggregate of average particle diameter 1.2～3.6M m, by mixing calcium aluminate cement, a clay mineral and slag, A powder mixture containing 1 to 10% by mass of a fine aggregate having a particle diameter of 5 mm or more in the fine aggregate is prepared, and a polymer dispersion is prepared by separately mixing a polymer and water. The powder mixture and the polymer dispersion liquid are blended so that the polymer solid content / cement mass ratio is 1 to 15% by mass.
好適には、前記本発明の耐酸性乾式吹付け用モルタル材料の製造方法は、前記粉体混合物にチクソ材が更に配合されることを特徴とする。 Preferably, the method for producing acid-resistant dry spraying mortar material of the present invention is characterized in that switch shit material is further blended in the powder mixture.
本発明の耐酸性乾式吹付け用モルタル材料は、酸性雰囲気に晒されるコンクリート構造物を補修するにあたり耐酸性を大幅に向上させることができ、乾式吹付け施工時の粉塵を大幅に減少させることができるとともに、リバウンド率を低減でき、従って施工性や作業性を著しく改善し、更に、材齢初期から強度発現に優れ、また吹付け充填性（吹付け安定性）や温度履歴下の強度安定性に優れる。従って、コンクリート構造物の劣化に対する補修、補強に用いる材料として有効に利用することができる。
また、本発明の耐酸性乾式吹付けモルタル材料の製造方法は、本発明の耐酸性乾式吹付け用モルタル材料を有効に、また経済的に製造することができるものである。
The acid-resistant dry spray mortar material of the present invention can greatly improve acid resistance in repairing a concrete structure exposed to an acidic atmosphere, and can greatly reduce dust during dry spray construction. In addition, the rebound rate can be reduced, thus significantly improving the workability and workability. Furthermore, it has excellent strength development from the early age of the material, and also has a spray filling property (spray stability) and strength stability under temperature history. Excellent. Therefore, it can be effectively used as a material used for repair and reinforcement against deterioration of a concrete structure.
Moreover, the manufacturing method of the acid-resistant dry spray mortar material of this invention can manufacture the acid-resistant dry spray mortar material of this invention effectively and economically.
本発明を以下の好適例を例示しつつ説明するが、これらに限定されるものではない。
本発明の耐酸性乾式吹付け用モルタル材料は、カルシウムアルミネート系セメント、スラグ、粘土鉱物及び細骨材を含む粉体混合物と、ポリマーディスパージョン液とを含み、平均粒子径が１．２〜３．６ｍｍの細骨材であって、且つ前記細骨材中に粒子径５ｍｍ以上の細骨材を該粉体混合物中１〜１０質量％含み、ポリマー固形分／セメント質量比が１〜１５質量％である。
The present invention will be described with reference to the following preferred examples, but is not limited thereto.
The acid-resistant dry spray mortar material of the present invention includes a powder mixture containing calcium aluminate cement, slag , clay mineral and fine aggregate, and a polymer dispersion liquid, and has an average particle size of 1.2 to A fine aggregate of 3.6 mm , and the fine aggregate contains 1-10% by mass of fine aggregate having a particle diameter of 5 mm or more in the powder mixture, and the polymer solid content / cement mass ratio is 1-15. % By mass.
本発明の耐酸性乾式吹付け用モルタル材料に含まれるカルシウムアルミネート系セメントとしては、アルミナを含み、水硬性カルシウム化合物を主体とするセメントであればその種類は限定されず、その具体例としては、ＣａＯ・２Ａｌ２Ｏ３、ＣａＯ・Ａｌ２Ｏ３、１２ＣａＯ・７Ａｌ２Ｏ３、１１ＣａＯ・７Ａｌ２Ｏ３・ＣａＦ２、３ＣａＯ・Ａｌ２Ｏ３、３ＣａＯ・３Ａｌ２Ｏ３・ＣａＳＯ４などと表される結晶性のカルシウムアルミネート類や、ＣａＯとＡｌ２Ｏ３成分を主成分とする非晶質の化合物等を例示することができ、これらを単独で、あるいは混合して用いることができる。好適には、アルミナセメント等を用いることが好ましい。 The calcium aluminate cement contained in the acid-resistant dry spray mortar material of the present invention is not limited as long as it is a cement containing alumina and mainly composed of a hydraulic calcium compound. , CaO · 2Al 2 O 3 , CaO · Al 2 O 3 , 12CaO · 7Al 2 O 3 , 11CaO · 7Al 2 O 3 · CaF 2 , 3CaO · Al 2 O 3 , 3CaO · 3Al 2 O 3 · CaSO 4 and the like Examples thereof include crystalline calcium aluminates and amorphous compounds mainly composed of CaO and Al 2 O 3 components, and these can be used alone or in combination. . Preferably, alumina cement or the like is used.
また、本発明の耐酸性乾式吹付け用モルタル材料に含まれる細骨材としては、特に限定されるものではなく、川砂、山砂、陸砂、砕砂、海砂、珪砂１〜７号等細骨材、または珪石粉、石灰石粉等の微粉末等を使用できる。 In addition, the fine aggregate contained in the acid-resistant dry spray mortar material of the present invention is not particularly limited, and river sand, mountain sand, land sand, crushed sand, sea sand, silica sand Nos. 1-7, etc. Aggregates or fine powders such as quartzite powder and limestone powder can be used.
本発明において使用される細骨材全体の平均粒子径は、１．２〜３．６ｍｍ、好ましくは１．４〜３．４ｍｍの範囲である。
かかる範囲内の平均粒子径を有する、調整された細骨材を配合することで、粉体圧送安定性が向上し、さらに粉塵の発生やリバウンド率を、より有効に低減させることも可能となる。
ここで、本発明において粒子径はＪＩＳ Ａ １１０２「骨材のふるい分け試験方法」に準じて測定した値で、平均粒子径とは積算％分布曲線より求めた５０％径の値をいうものとする。
The average particle diameter of the whole fine aggregate used in the present invention is 1.2 to 3.6 mm, preferably 1.4 to 3.4 mm.
By blending an adjusted fine aggregate having an average particle diameter within such a range, powder feed stability is improved, and it is also possible to more effectively reduce dust generation and rebound rate. .
Here, in the present invention, the particle diameter is a value measured according to JIS A 1102 “Aggregate Screening Test Method”, and the average particle diameter is a value of 50% diameter obtained from an integrated% distribution curve. .
また、粒子径が５ｍｍ以上の細骨材は、粉体混合物中１〜１０質量％含むものであり、好ましくは４〜８質量％である。
このようにすることで、ホース内での材料の滞留を防ぎ、圧送性が向上して安定した吹付け施工が可能となる。
Further, fine particle element size of 5mm or more materials are those powder mixtures containing 1-10 wt%, preferably from 4 to 8% by weight.
By doing in this way, retention of the material in a hose is prevented, pumpability improves, and the stable spray construction becomes possible.
また、細骨材全体の含有量は、特に限定されないが、通常、上記セメント１００質量部に対して、５０〜３００重量部であることが好ましく、１００〜２５０質量部とすることがより好ましい。これは、かかる範囲であると補修箇所、特に鉄筋裏への充填性が良好であり、作業性及び圧送性に優れるからである。 Moreover, although content of the whole fine aggregate is not specifically limited, Usually, it is preferable that it is 50-300 weight part with respect to 100 mass parts of said cements, and it is more preferable to set it as 100-250 mass parts. This is because, within such a range, the filling property to the repaired part, particularly the back of the reinforcing bar is good, and the workability and the pumpability are excellent.
さらに本発明の耐酸性乾式吹付け用モルタル材料に含まれるスラグとしては、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種以上配合したものが例示される。
そのブレーン比表面積は２０００〜６０００ｃｍ２／ｇ、好ましくは３０００〜５０００ｃｍ２／ｇである。ブレーン比表面積が６０００ｃｍ２／ｇを超えると、粉体がホース内へ滞留しやすくなり、安定的な吹付け施工が困難となる可能性がある。
なお、本発明において、ブレーン比表面積はＪＩＳ Ｒ ５２０１「比表面積試験」に準じて測定した値をいうものである。
また配合量は、特に限定されないが、通常、上記セメント１００質量部に対して、１０〜３００質量部であることが好ましく、１００〜２００質量部とすることがより好ましい。
これは、かかる範囲であると耐酸性が向上して、施工性にも優れ強度発現性も良好だからである。
Further, examples of the slag contained in the acid-resistant dry spray mortar material of the present invention include one or more slag fine powders such as blast furnace slag, converter slag, and dephosphorized slag.
Its Blaine specific surface area of 2000~6000cm 2 / g, preferably from 3000~5000cm 2 / g. If the Blaine specific surface area exceeds 6000 cm 2 / g, the powder tends to stay in the hose, which may make stable spraying difficult.
In the present invention, the Blaine specific surface area is a value measured according to JIS R 5201 “specific surface area test”.
Moreover, although a compounding quantity is not specifically limited, Usually, it is preferable that it is 10-300 mass parts with respect to 100 mass parts of the said cement, and it is more preferable to set it as 100-200 mass parts.
This is because in such a range, acid resistance is improved, workability is excellent, and strength development is also good.
また本発明の耐酸性乾式吹付け用モルタル材料には、望ましくはさらに粘土鉱物及び／またはチクソ材を含む。
粘土鉱物としては、メタカオリン、セピオライト、ヘクトライト等が例示され、少なくとも１種を配合することができる。
また配合量は、特に限定されないが、通常、上記セメント１００質量部に対して、１〜５０質量部であることが好ましく、５〜３０質量部とすることがより好ましい。
これは、かかる範囲で粘土鉱物を含有すると、更なる強度の増進を図ることができ、高温、例えば４０℃で養生しても相転移による強度低減を十分に阻止することが可能となる。
The acid-resistant dry spray mortar material of the present invention preferably further contains a clay mineral and / or a thixo material.
Examples of the clay mineral include metakaolin, sepiolite, hectorite and the like, and at least one kind can be blended.
Moreover, although a compounding quantity is not specifically limited, Usually, it is preferable that it is 1-50 mass parts with respect to 100 mass parts of the said cement, and it is more preferable to set it as 5-30 mass parts.
If the clay mineral is contained in such a range, it is possible to further increase the strength, and even when cured at a high temperature, for example, 40 ° C., the strength reduction due to the phase transition can be sufficiently prevented.
また、チクソ材としては、炭素繊維、ガラス繊維、ポリオレフィン繊維等を例示することができる。
また配合量は、特に限定されないが、通常、上記セメント１００質量部に対して、０．１〜５質量部であることが好ましく、０．５〜２質量部とすることがより好ましい。
これは、かかる範囲でチクソ材を含有すると、吹付けを行なった場合に、リバウンドやダレを、さらに有効に防止することが可能となる。
Moreover, as a thixo material, carbon fiber, glass fiber, polyolefin fiber, etc. can be illustrated.
Moreover, although a compounding quantity is not specifically limited, Usually, it is preferable that it is 0.1-5 mass parts with respect to 100 mass parts of the said cement, and it is more preferable to set it as 0.5-2 mass parts.
If the thixo material is contained within such a range, rebound and sagging can be more effectively prevented when spraying is performed.
また、本発明の上記効果を損なわない範囲で、必要に応じて各種混和剤（例えば、減水剤、増粘剤、消泡剤等）を含有することもできるが、本発明においては、シリカヒューム、フライアッシュ、膨張材や収縮低減剤は含まない。 In addition, various admixtures (for example, a water reducing agent, a thickener, an antifoaming agent, etc.) can be contained as necessary within the range not impairing the above-mentioned effects of the present invention. Contains no fly ash, expansion material or shrinkage reducing agent.
上記カルシウムアルミネート系セメント、スラグ、細骨材、更に好適には、粘土鉱物やチクソ材、そして必要に応じて上記混和剤を混合して、吹付けモルタル材料を調製する際に用いる粉体混合物（ドライミックス粉末）とすることができる。
当該ドライミックス粉末は、現場で混合してもよいが、設備装置や作業の簡略化のために、予めプレミックスされることが望ましい。
The calcium aluminate cement, slag, fine aggregate, and more preferably, a clay mixture, a thixo material, and, if necessary, the above admixture, and a powder mixture used when preparing a sprayed mortar material (Dry mix powder).
The dry mix powder may be mixed on site, but it is desirable that the dry mix powder be premixed in advance in order to simplify equipment and work.
また、本発明の吹付けモルタル材料にはセメント混和用ポリマーディスパージョン液が含まれ、該ポリマーディスパージョンに含まれるセメント混和用ポリマーとしては、ＪＩＳ Ａ ６２０３に例示されるポリアクリル酸エステル、スチレンブタジエン、エチレン酢酸ビニル、酢酸ビニル／バーサチック酸ビニルエステル、酢酸ビニル／バーサチック酸ビニル／アクリル酸エステルなどを主成分とするポリマーディスバージョンが例示でき、これらを単独でまたは混合して用いることができる。
再乳化形粉末樹脂は、粉末樹脂が水に再分散し再乳化するためには数十秒から数分かかり、吹付けノズル手前からノズル先端までのわずかな時間では均一に再乳化するのは困難であり、好ましくない。
特に好適には、スチレン／アクリル系ポリマーを用いることができ、かかるスチレン／アクリル系ポリマーのディスパージョン液を用いることが、耐久性の点から好ましい。
Further, the sprayed mortar material of the present invention contains a polymer dispersion liquid for cement admixture. Examples of the polymer for cement admixture contained in the polymer dispersion include polyacrylate esters and styrene butadiene exemplified in JIS A6203. Examples thereof include polymer dispersions mainly composed of ethylene vinyl acetate, vinyl acetate / vinyl versatate, vinyl acetate / vinyl versatate / acrylic acid ester, etc., and these can be used alone or in combination.
Re-emulsifying powder resin takes several tens of seconds to several minutes for the powder resin to re-disperse in water and re-emulsify, and it is difficult to uniformly re-emulsify in a short time from the front of the spray nozzle to the nozzle tip. This is not preferable.
Particularly preferably, a styrene / acrylic polymer can be used, and the use of such a styrene / acrylic polymer dispersion is preferable from the viewpoint of durability.
かかる混和用ポリマーを水に分散させてセメント混和用ポリマーディスパージョン液とする。
かかる混和用ポリマーは、ポリマー固形分／セメント質量比が１〜１５％、好ましくは２〜１０質量％となるよう添加混和されていることが望ましい。かかる範囲であると、吹付けモルタルの強度を低下させず、粘性を良好に保持でき、粉塵の低減及び付着性に優れるからである。
Such an admixing polymer is dispersed in water to obtain a cement admixing polymer dispersion.
The admixing polymer is desirably added and mixed so that the polymer solid content / cement mass ratio is 1 to 15%, preferably 2 to 10% by mass. This is because, within such a range, the strength of the sprayed mortar is not lowered, the viscosity can be maintained well, and the dust reduction and adhesion are excellent.
また、本発明の耐酸性乾式吹付け用モルタルの製造方法は、カルシウムアルミネート系セメント、平均粒子径が１．２〜３．６ｍｍの細骨材、スラグ、粘土鉱物、必要に応じてチクソ材や上記混和剤を混合して、前記細骨材中の粒子径５ｍｍ以上の細骨材が粉体混合物中１〜１０質量％含有された粉末混合物を調製し、別途、ポリマーと水とを混合してポリマーディスパージョン液を調製し、前記粉末混合物と前記ポリマーディスパージョン液とをポリマー固形分／セメント質量比が１〜１５質量％となるように配合して調製される。 The manufacturing method of acid resistance dry spraying mortar of the invention, calcium aluminate cement, fine aggregate having an average particle size of 1.2～3.6M m, slag, clay minerals, if necessary Ji Mixing the fucking material and the above admixture to prepare a powder mixture containing 1 to 10% by mass of fine aggregate with a particle diameter of 5 mm or more in the fine aggregate . Separately, a polymer and water Are mixed to prepare a polymer dispersion liquid, and the powder mixture and the polymer dispersion liquid are blended so that the polymer solid content / cement mass ratio is 1 to 15% by mass.
ポリマーディスパージョン液は、該ポリマーディスパージョン液と上記ドライミックス粉体（粉末混合物）を混合する際に、ポリマー固形分／セメント質量比が１〜１５質量％、好ましくは２〜１０質量％添加混和されている状態となるように調製しておくことが施工性の点から望ましい。
例えば、予め作製されたポリマーディスパージョン液に水を混合して希釈したポリマーディスパージョン液であっても、ポリマーと水とを混合したポリマーディスパージョン液であっても、吹付け施工の際にポリマー固形分／セメント質量比が１〜１５質量％、好ましくは２〜１０質量％添加混和されている状態となれば、いずれのポリマーディスパージョン液も適用することができる。
このような範囲となるようにポリマーディスパージョン液を調製することで、吹付けモルタルの強度を低下させず、粘性を良好に保持でき、付着性を優れるものとすることができる。
When mixing the polymer dispersion liquid and the dry mix powder (powder mixture), the polymer dispersion liquid has a polymer solid content / cement mass ratio of 1 to 15% by mass, preferably 2 to 10% by mass. From the viewpoint of workability, it is desirable to prepare it so that it is in a state where it is made.
For example, a polymer dispersion liquid prepared by mixing water with a polymer dispersion liquid prepared in advance, or a polymer dispersion liquid obtained by mixing a polymer and water, can be used during spraying. Any polymer dispersion liquid can be applied as long as the solid content / cement mass ratio is 1 to 15% by mass, preferably 2 to 10% by mass.
By preparing the polymer dispersion liquid in such a range, the viscosity of the sprayed mortar can be maintained well, the viscosity can be maintained well, and the adhesion can be excellent.
本発明の乾式吹付け用モルタル材料を吹付ける際には、前記粉末混合物と希釈ポリマーディスパージョン液とを、別個に搬送する乾式吹付け工法に適用されるものであり、好適には、吹付け用ノズルの中で両者を混合して、吹付け施工するものである。 When spraying the mortar material for dry spraying of the present invention, the powder mixture and the diluted polymer dispersion liquid are applied to a dry spraying method of separately conveying, preferably spraying Both are mixed in the nozzle for spraying and sprayed.
具体的には、かかるドライミックスモルタルを乾式吹付け装置に用いて、空気圧送し、別途予め混合したポリマーディスパージョン液をポンプ圧送し、両者を当該ノズル部分で混合し、断面修復箇所へ乾式吹付け工法を施工するものである。 Specifically, using this dry mix mortar in a dry spraying device, pneumatically feeding, separately pumping a polymer dispersion liquid previously mixed, mixing both at the nozzle part, and dry-blowing to the cross-section repair site The construction method is applied.
このように、ノズル内でドライミックスモルタルと、希釈ポリマーディスパージョン液とを均一に混合して、モルタル吹付けを施工することにより、材料の安定的な圧送及び施工が可能となり、また粉塵の発生を低減し、かつリバウンド率の低い、コンクリート構造物の劣化に対する耐酸性を有する補修及び補強工法、例えば下水処理施設、鉄道や道路等の高架橋、トンネル等の断面補修工法に有効に使用できる。 In this way, the dry mix mortar and the diluted polymer dispersion liquid are uniformly mixed in the nozzle, and mortar spraying is performed, enabling stable pumping and construction of materials, and generation of dust. It can be effectively used for repairing and reinforcing methods having acid resistance against deterioration of concrete structures with a low rebound rate, such as sewage treatment facilities, viaducts such as railways and roads, and cross-sectional repair methods such as tunnels.
本発明を次の実施例及び試験例により説明するが、これらに限定されるものではない。
使用材料
乾式吹付け用モルタル材料を調製するにあたって、以下の材料を使用して、吹付けモルタル材料を調製した。
・カルシウムアルミネート系セメント（CA）：アサヒアルミナセメント１号（ＡＧＣセラミックス株式会社製）
・ポルトランドセメント（NC）：普通ポルトランドセメント（住友大阪セメント株式会社製）
・スラグ粉末：高炉スラグ微粉末（ブレーン比表面積４０００ｃｍ２/ｇ、ウツイ・デイシイ興産株式会社製）
・粘土鉱物：メタカオリン（平均粒子径１．４μｍ、林化成株式会社製）
・チクソ材（繊維）：ポリオレフィン繊維（平均繊維長０．１ｍｍ、三井化学株式会社製）
・細骨材 ：珪砂１号、２号、４号、５号、６号、７号
・膨張材 ：商品名 サクス（住友大阪セメント株式会社製）
・セメント混和用ポリマーディスパージョン液：商品名 ライオンボンドＡ
（固形分４５％、スチレンアクリル系ポリマーエマルション；住友大阪セメント株式会社製）
・水：水道水
The present invention is illustrated by the following examples and test examples, but is not limited thereto.
Materials Used In preparing the dry spray mortar material, the following materials were used to prepare the spray mortar material.
・ Calcium aluminate cement (CA): Asahi alumina cement No. 1 (manufactured by AGC Ceramics Co., Ltd.)
・ Portland cement (NC): Ordinary Portland cement (manufactured by Sumitomo Osaka Cement Co., Ltd.)
・ Slag powder: Blast furnace slag fine powder (Blaine specific surface area 4000 cm 2 / g, made by Utsui Daisy Kosan Co., Ltd.)
・ Clay mineral: Metakaolin (average particle size 1.4μm, manufactured by Hayashi Kasei Co., Ltd.)
・ Thixotropic material (fiber): Polyolefin fiber (average fiber length 0.1 mm, manufactured by Mitsui Chemicals, Inc.)
・ Fine aggregate: Silica sand No. 1, 2, 4, 5, 6, 7 ・ Expandable material: Brand name Saks (manufactured by Sumitomo Osaka Cement Co., Ltd.)
・ Polymer dispersion liquid for cement admixture: Product name Lion Bond A
(45% solids, styrene acrylic polymer emulsion; manufactured by Sumitomo Osaka Cement Co., Ltd.)
・ Water: Tap water
（実施例１〜５・比較例１〜１４）
上記各材料を使用して、次の表１に示す配合割合で、アルミナセメント、高炉スラグ、粘土鉱物、チクソ材、細骨材を均質に混合して、ドライミックス粉末を調製した。
(Examples 1-5 and Comparative Examples 1-14)
Using each of the above materials, alumina cement, blast furnace slag, clay minerals, thixo materials, and fine aggregates were homogeneously mixed at a blending ratio shown in Table 1 to prepare a dry mix powder.
次いで、東和式ロータリーガン吹付け機を用いて、上記各ドライミックス粉末を圧縮空気にてホース内を水平方向に６０ｍ圧送し、また別途、上記セメント混和用ポリマーディスパージョン液を水と予め混合した希釈ポリマーディスパージョン液を、ポンプにてホース内を水平方向に６０ｍ圧送し、当該ドライミックス粉体と、上記セメント混和用ポリマーディスパージョン液及び水が予め混合した希釈ポリマージョン液とを、表１に示す混合割合で、当該ノズル内で混合して乾式吹付け用モルタル材料とし、型枠体に垂直に乾式吹付けた。 Next, using a Towa type rotary gun sprayer, each dry mix powder was fed in compressed air for 60 m in the horizontal direction, and separately, the cement-mixing polymer dispersion was mixed with water in advance. The diluted polymer dispersion liquid was pumped 60 m horizontally in the hose with a pump, and the dry mix powder and the diluted polymer dispersion liquid in which the cement-mixing polymer dispersion liquid and water were previously mixed are shown in Table 1. The mixture was mixed in the nozzle at the mixing ratio shown in the above to obtain a dry-type mortar material, which was dry-sprayed perpendicularly to the mold body.
得られた各モルタル材料中のポリマー固形分／セメント質量比（％）、粒子径が５ｍｍ以上の細骨材量（質量％）、細骨材の平均粒子径（ｍｍ）を、下記表２に示す。 The following table 2 shows the polymer solid content / cement mass ratio (%), the fine aggregate amount (% by mass) with a particle diameter of 5 mm or more, and the average particle diameter (mm) of the fine aggregate in each obtained mortar material. Show.
型枠に吹付けた際の粉塵量、リバウンド率、圧縮強度及び圧縮強度のコア変動係数を下記のようにして測定して、その結果を表２に示す。 The amount of dust, the rebound rate, the compressive strength, and the core variation coefficient of the compressive strength when sprayed on the mold were measured as follows, and the results are shown in Table 2.
（１）粉塵量
上記吹付けを２．０×４．０×３．０ｍの簡易密閉空間内で実施した際に、柴田科学社製デジタル粉塵計「ＬＤ−５Ｄ」を用いて、吹付け位置より３ｍの距離において壁面に対し約３０°傾斜させて設置した３０×４５×１５ｃｍの木製型枠へ吹き終えたときの粉塵量をカウントした。その結果をカウント数（ｃｐｍ）で示す。
評価基準：粉塵量が２５００ｃｐｍ未満を○とし、２５００ｃｐｍ以上を×と評価した。
(1) Dust amount When the above spraying is carried out in a simple sealed space of 2.0 x 4.0 x 3.0 m, the spraying position using a digital dust meter "LD-5D" manufactured by Shibata Kagakusha Further, the amount of dust was counted when it was blown into a 30 × 45 × 15 cm wooden form installed at an angle of about 30 ° with respect to the wall surface at a distance of 3 m. The result is shown by count number (cpm).
Evaluation criteria: A dust amount of less than 2500 cpm was evaluated as ◯, and 2500 cpm or more was evaluated as x.
（２）リバウンド率（％）
上記粉塵量の評価と同じようにして、壁面に対し約３０°傾斜させて設置した３０×４５×１５ｃｍの木製型枠に、吹付けた際のリバウンド率を測定した。
リバウンド率は、前記吹付け施工時における、（吹付け時に跳ね返ったモルタル材料の質量／吹付け時の材料の全使用質量）×１００（％）で示した値である。
評価基準：リバウンド率が１８％未満のものを○とし、１８％以上のものを×と評価した。
(2) Rebound rate (%)
In the same manner as the evaluation of the dust amount, the rebound rate was measured when sprayed on a 30 × 45 × 15 cm wooden form installed at an inclination of about 30 ° with respect to the wall surface.
The rebound rate is a value represented by (mass of mortar material bounced back during spraying / total used mass of material during spraying) × 100 (%) at the time of spraying.
Evaluation criteria: A rebound rate of less than 18% was evaluated as ◯, and a rebound rate of 18% or more was evaluated as ×.
（３）圧縮強度
ＪＳＣＥ−Ｆ５６１（吹付けコンクリートの圧縮強度試験用供試体の作り方）に記載の型枠に吹付け、２日後にコア抜き（Φ１０×２０ｃｍ）したコア硬化体を、材齢２８日まで２０℃の水中にて養生した後、ＪＩＳ Ａ １１０８に準じて、各コア硬化体１５個の圧縮強度を測定し、その平均値を示す。
評価基準：圧縮強度が４５Ｎ／ｍｍ２以上のものを○とし、４５Ｎ／ｍｍ２未満のものを×と評価した。
(3) Compressive strength The hardened core, which was sprayed on the mold described in JSCE-F561 (How to make specimens for compressive strength test of shotcrete) and cored (Φ10 × 20 cm) after 2 days, was obtained at 28 After curing in water at 20 ° C. until the day, according to JIS A 1108, the compression strength of 15 core cured bodies is measured, and the average value is shown.
Evaluation criteria: A sample having a compressive strength of 45 N / mm 2 or more was evaluated as ◯, and a sample having a compressive strength of less than 45 N / mm 2 was evaluated as ×.
（４）圧縮強度の変動係数
前記（３）のコア硬化体１５個の圧縮強度の標準偏差及び平均値から算出した変動係数（ＣＶ：％）値である。
なお、変動係数が大きいと、コア硬化体の圧縮強度のばらつきが大きいことを意味し、吹付け材料の充填性（吹付け安定性）に問題がある。
評価基準：圧縮強度変動係数が１．０未満のものを○とし、１．０以上のものを×とした。
(4) Coefficient of variation of compressive strength This is a coefficient of variation (CV:%) calculated from the standard deviation and average value of the compressive strength of the 15 core cured bodies of (3).
In addition, when a coefficient of variation is large, it means that the dispersion | variation in the compressive strength of a core hardening body is large, and there exists a problem in the filling property (spraying stability) of a spraying material.
Evaluation criteria: those having a compressive strength variation coefficient of less than 1.0 were evaluated as ○, and those having a compression strength of 1.0 or more as ×.
表２中、上記（１）〜（４）までの試験例において全ての評価が○であったものを、総合評価○とし、少なくともいずれかの評価が良好ではないものを総合評価×として表した。 In Table 2, in the test examples (1) to (4) above, all evaluations were evaluated as “good”, and at least one of the evaluations was not good was expressed as “total evaluation”. .
（実施例６〜７、比較例１５〜１７）
上記各材料を使用して、次の表３に示す配合割合で、アルミナセメント、ポルトランドセメント、高炉スラグ、粘土鉱物、チクソ材、細骨材をそれぞれ均質に混合して、ドライミックス粉末を調製した。
(Examples 6-7, Comparative Examples 15-17)
Using each of the above materials, alumina cement, Portland cement, blast furnace slag, clay mineral, thixo material, and fine aggregate were mixed homogeneously at the blending ratios shown in Table 3 to prepare a dry mix powder. .
次いで、東和式ロータリーガン吹付け機を用いて、上記各ドライミックス粉末を圧縮空気にてホース内を水平方向に６０ｍ圧送し、また別途、上記セメント混和用ポリマーディスパージョン液を水と予め混合した希釈ポリマーディスパージョン液を、ポンプにてホース内を水平方向に６０ｍ圧送し、当該ドライミックス粉体と、上記セメント混和用ポリマーディスパージョン液及び水が予め混合した希釈ポリマージョン液とを、表３に示す混合割合で当該ノズル内で混合して乾式吹付け用モルタル材料とし、型枠体に垂直に乾式吹付けた。 Next, using a Towa type rotary gun sprayer, each dry mix powder was fed in compressed air for 60 m in the horizontal direction, and separately, the cement-mixing polymer dispersion was mixed with water in advance. The diluted polymer dispersion liquid was pumped 60 m horizontally in the hose with a pump, and the dry mix powder and the diluted polymer dispersion liquid in which the cement-mixing polymer dispersion liquid and water were previously mixed are shown in Table 3. The mixture was mixed in the nozzle at a mixing ratio shown in the above to obtain a dry spraying mortar material, which was dry sprayed perpendicularly to the mold body.
型枠に乾式吹付けした後の２０℃（９０％湿度：９０％R.H）で２８日間養生した後の圧縮強度、２０℃で２８日間養生した後更に４０℃（９０％湿度：９０％R.H）で２８日間養生した後の圧縮強度、前記２０℃圧縮強度に対する４０℃圧縮強度の比をそれぞれ下記のようにして測定して、その結果を表４に示す。 Compressive strength after 28 days of curing at 20 ° C (90% humidity: 90% RH) after dry spraying on the mold, 40 ° C (90% humidity: 90% RH) after curing at 20 ° C for 28 days And the ratio of the compressive strength after curing for 28 days and the compressive strength at 40 ° C. to the compressive strength at 20 ° C. were measured as follows, and the results are shown in Table 4.
（５）圧縮強度（２０℃）
ＪＳＣＥ−Ｆ５６１（吹付けコンクリートの圧縮強度試験用供試体の作り方）に記載の型枠に吹付け、２日後にコア抜き（Φ１０×２０ｃｍ）したコア硬化体を材齢２８日まで２０℃、湿度９０％（９０％R.H）の気中にて養生した後、ＪＩＳ Ａ １１０８に準じて、各コア硬化体３個の圧縮強度を測定し、その平均値を示す。
評価基準：圧縮強度が４５Ｎ／ｍｍ２以上のものを○とし、４５Ｎ／ｍｍ２未満のものを×と評価した。
(5) Compressive strength (20 ° C)
The hardened core, which was sprayed on the mold described in JSCE-F561 (How to make specimens for compressive strength test of shotcrete) and cored (Φ10 × 20 cm) after 2 days, was kept at 20 ° C. and humidity until 28 days of age. After curing in the atmosphere of 90% (90% RH), the compressive strength of each of the three core cured bodies is measured according to JIS A 1108, and the average value is shown.
Evaluation criteria: A sample having a compressive strength of 45 N / mm 2 or more was evaluated as ◯, and a sample having a compressive strength of less than 45 N / mm 2 was evaluated as ×.
（６）圧縮強度（４０℃）
材齢２８日まで２０℃、湿度９０％（９０％R.H）の気中にて養生した後、更に２８日間、４０℃、湿度９０％（９０％R.H）で気中養生した以外は、上記圧縮強度（２０℃）と同様にして圧縮強度を測定した。評価基準も同様の評価基準で評価した。
(6) Compressive strength (40 ° C)
The above compression except that it was cured in air at 20 ° C. and 90% humidity (90% RH) until 28 days of age, and then further cured in air at 40 ° C. and 90% humidity (90% RH) for 28 days. The compressive strength was measured in the same manner as the strength (20 ° C.). Evaluation criteria were also evaluated based on the same evaluation criteria.
（７）圧縮強度変化判定
前記（６）圧縮強度（４０℃）での圧縮強度の、前記（５）圧縮強度（２０℃）での圧縮強度に対する割合を判定する。
評価基準：圧縮強度変化判定が９５％以上を○とし、９５％未満を×とした。
(7) Determination of compression strength change The ratio of the compression strength at (6) compression strength (40 ° C) to the compression strength at (5) compression strength (20 ° C) is determined.
Evaluation criteria: Compressive strength change determination was 95% or more as ◯, and less than 95% as x.
（８）耐酸性試験
上記（５）圧縮強度（２０℃）で調製したコア硬化体を、日本下水道事業団「下水道コンクリート構造物の腐食抑制技術及び防食技術マニュアル」に示されている試験方法に準じて、材齢２８日まで２０℃水中にて養生した後、５％硫酸水溶液に２８日間浸漬した後、半分に切断し、切断面にフェノールフタレイン溶液を噴霧後，赤色を呈した部分の直径を５箇所測定し、その平均値を試験体幅の初期値から差し引いた値の１／２を算出して求めた。
評価基準：硫酸浸透深さが２ｍｍ未満のものを○とし、２ｍｍ以上のものを×とした。
(8) Acid resistance test (5) The core hardened body prepared at the compressive strength (20 ° C) is subjected to the test method shown in the Japan Sewerage Corporation “Corrosion control technology and anticorrosion technology manual for sewer concrete structures”. Similarly, after curing in water at 20 ° C. until the age of 28 days, after immersing in a 5% sulfuric acid aqueous solution for 28 days, cut in half and spray the phenolphthalein solution on the cut surface, then the reddish part The diameter was measured at five locations, and the average value was obtained by calculating ½ of the value obtained by subtracting the initial value of the specimen width.
Evaluation criteria: A sample having a penetration depth of sulfuric acid of less than 2 mm was evaluated as ○, and a sample having a penetration depth of 2 mm or more was evaluated as ×.
表４中、上記（７）〜（８）までの試験例において双方の評価が○であったものを、総合評価○とし、少なくともいずれかの評価が○ではないものを総合評価×として表した。 In Table 4, in the test examples (7) to (8) above, both evaluations were evaluated as “good”, and at least one of the evaluations was not good as “good”. .
上記表より、本発明の乾式吹付け用モルタル材料は、粉塵量の発生が抑制され、リバウンド率も著しく低減され、また、コア硬化体圧縮強度測定結果から、優れた圧縮強度を有するとともに、温度変化に対しても圧縮強度変化率が少なく、さらに耐酸性にも優れ、乾式吹付け用モルタル材料の充填性（吹付け安定性）に優れていることがわかる。 From the above table, the dry spraying mortar material of the present invention is suppressed in the generation of dust, the rebound rate is remarkably reduced, and from the measurement result of the core cured body compressive strength, it has excellent compressive strength and temperature. It can be seen that the rate of change in compressive strength is small with respect to the change, the acid resistance is also excellent, and the filling property (spray stability) of the mortar material for dry spraying is excellent.
本発明の乾式吹付け用モルタル材料は、コンクリート構造物の補修及び補強分野において、断面修復材等として有効に用いることができ、特に、下水道処理施設、鉄道や道路等の高架橋、トンネル等の断面補修工法等の施工に適切に用いることが可能となる。 The mortar material for dry spraying of the present invention can be effectively used as a cross-section restoration material in the field of repair and reinforcement of concrete structures, and in particular, cross sections of sewerage treatment facilities, viaducts such as railways and roads, tunnels, etc. It can be used appropriately for construction such as repair methods.
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