JP2015182906A - Dry shrinkage reducing agent composition for premixed mortar, premixed mortar, and cement cured body using the same - Google Patents
Dry shrinkage reducing agent composition for premixed mortar, premixed mortar, and cement cured body using the same Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 70
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 27
- 239000000203 mixture Substances 0.000 title claims abstract description 22
- 239000004568 cement Substances 0.000 title claims description 41
- 239000000843 powder Substances 0.000 claims abstract description 46
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 23
- 229920000570 polyether Polymers 0.000 claims abstract description 23
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 7
- 125000006353 oxyethylene group Chemical group 0.000 claims abstract description 6
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 18
- 125000004432 carbon atom Chemical group C* 0.000 claims description 16
- 125000005702 oxyalkylene group Chemical group 0.000 claims description 11
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 125000000217 alkyl group Chemical group 0.000 claims description 5
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 5
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 21
- 238000011156 evaluation Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 14
- 239000011398 Portland cement Substances 0.000 description 10
- 239000012615 aggregate Substances 0.000 description 10
- 238000002156 mixing Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- -1 n-octyl group Chemical group 0.000 description 7
- 239000000377 silicon dioxide Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 239000010881 fly ash Substances 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000004438 BET method Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910052956 cinnabar Inorganic materials 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 125000005250 alkyl acrylate group Chemical group 0.000 description 2
- 238000012661 block copolymerization Methods 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000007334 copolymerization reaction Methods 0.000 description 2
- 238000004945 emulsification Methods 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- 125000003229 2-methylhexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 229920006222 acrylic ester polymer Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 125000004491 isohexyl group Chemical group C(CCC(C)C)* 0.000 description 1
- 125000001972 isopentyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 229920003146 methacrylic ester copolymer Polymers 0.000 description 1
- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000011433 polymer cement mortar Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- CENHPXAQKISCGD-UHFFFAOYSA-N trioxathietane 4,4-dioxide Chemical compound O=S1(=O)OOO1 CENHPXAQKISCGD-UHFFFAOYSA-N 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、主に土木、建築分野において使用されるプレミックスモルタル用乾燥収縮低減剤組成物に関し、またこれを用いたプレミックスモルタルおよびこれらを用いたセメント硬化体に関する。より詳しくは、あらかじめ各種材料を混合しておいて、施行現場で水、或いはエマルション水溶液と練り混ぜることによって得られるプレミックスモルタルおよびセメントモルタルの硬化体に関する。 The present invention relates to a dry shrinkage reducing agent composition for premix mortar mainly used in the civil engineering and construction fields, and also relates to a premix mortar using the composition and a hardened cement using the same. More specifically, the present invention relates to a hardened body of premix mortar and cement mortar obtained by mixing various materials in advance and kneading with water or an aqueous emulsion solution at the enforcement site.
本発明でいうプレミックスモルタルとは、モルタルの総称であり、セメント硬化体とは、セメントモルタルの硬化体を総称するものである。 The premix mortar referred to in the present invention is a generic name for mortar, and the cement hardened body is a generic name for a hardened body of cement mortar.
プレミックスモルタル製品は、コンクリート構造物の改修や補修等に使用されるモルタルであり、セメント、骨材、無機フィラー等の無機系の粉体材料や再乳化型粉末樹脂等の有機系の粉体材料をあらかじめ配合した状態で袋詰めされ、施工現場にて水と混練することで、モルタル、およびポリマーモルタルとされる。このようなモルタルは、コンクリート構造物に拘束されるため、乾燥収縮によりひび割れてしまうことがあることから、乾燥収縮を抑制する目的で、粉末状のプレミックスモルタル用乾燥収縮低減剤が使用されている。 Premixed mortar products are mortars used for repairing and repairing concrete structures. Inorganic powder materials such as cement, aggregates and inorganic fillers, and organic powders such as re-emulsifying powder resins The material is pre-blended into a bag and kneaded with water at the construction site to form mortar and polymer mortar. Since such mortars are constrained by the concrete structure, they may crack due to drying shrinkage. For the purpose of suppressing drying shrinkage, a powdery dry shrinkage reducing agent for premixed mortar is used. Yes.
粉末状のプレミックスモルタル用乾燥収縮低減剤として、液体のポリエーテルを吸油性の無機あるいは有機粉末に含浸させたもの、ネオペンチルグリコールなどのアルカンジオール類やポリエチレングリコール類が挙げられる（例えば特許文献１〜３）。 Examples of the drying shrinkage reducing agent for powdered premix mortar include oil-impregnated inorganic or organic powder impregnated with liquid polyether, alkanediols such as neopentyl glycol, and polyethylene glycols (for example, patent documents). 1-3).
特許文献１の液体のポリエーテルを吸油性の無機あるいは有機粉末に含浸させたもの（以下、「ポリエーテル含浸粉末」という）は、低添加量でも高い収縮低減効果を発揮し、圧縮強度にも影響を与えないことが特徴である。しかしながら、補修等に使用される各種プレミックスモルタル材料には、より高い品質が求められている。それは、補修という性質上当然であり、特に旧日本道路公団（現ＮＥＸＣＯ）で使用される断面修復材は、乾燥収縮率が０．０５％以下と定められている。このような乾燥収縮率への高い要求に対して、ポリエーテル含浸粉末を多量に添加してもその乾燥収縮率に対応できない場合がある。また、ポリエーテル含浸粉末を多量に添加した場合、プレミックスモルタル中の水硬性成分の表面にポリエーテルの吸着層を形成しやすくなり、水との反応を阻害するため圧縮強度の低下を引き起こしてしまうという問題がある。また、吸油性の無機あるいは有機粉末は、プレミックスモルタル中の水分を吸収し、プレミックスモルタルの作業性を低下させてしまうという問題がある。 An oil-absorbing inorganic or organic powder impregnated with the liquid polyether of Patent Document 1 (hereinafter referred to as “polyether-impregnated powder”) exhibits a high shrinkage reduction effect even at a low addition amount, and also has a high compressive strength. It is characteristic that it does not affect. However, higher quality is required for various premixed mortar materials used for repair and the like. This is natural due to the nature of repair. In particular, the cross-section restoration material used in the former Japan Highway Public Corporation (currently NEXCO) has a drying shrinkage rate of 0.05% or less. In response to such a high demand for the drying shrinkage rate, there are cases in which even if a large amount of polyether impregnated powder is added, the drying shrinkage rate cannot be met. In addition, when a large amount of polyether impregnated powder is added, it becomes easy to form a polyether adsorption layer on the surface of the hydraulic component in the premix mortar, causing a decrease in compressive strength because it inhibits the reaction with water. There is a problem of end. In addition, the oil-absorbing inorganic or organic powder has a problem that it absorbs moisture in the premix mortar and reduces the workability of the premix mortar.
特許文献２、３のアルカンジオール類やポリエチレングリコール類のような、成分そのものが固体のものは、多量に添加することで、プレミックスモルタル材料に求められている乾燥収縮率の高い品質に対応することができる。しかしながら、多量に添加した場合、プレミックスモルタル中の水硬性成分の表面に吸着層を形成し、水との反応を阻害するため圧縮強度の低下を引き起こしてしまうという問題がある。 When the component itself is a solid, such as alkanediols and polyethylene glycols of Patent Documents 2 and 3, it can be added in a large amount to correspond to the quality with high drying shrinkage required for premixed mortar materials. be able to. However, when added in a large amount, an adsorbing layer is formed on the surface of the hydraulic component in the premix mortar, and the reaction with water is hindered, resulting in a decrease in compressive strength.
本発明は、上記の問題を解消すべく種々検討した結果なされたもので、高い乾燥収縮を抑制する効果を発現しつつ、強度低下が抑制されると共に、フレッシュモルタル時の作業性に優れるプレミックスモルタル用乾燥収縮低減剤組成物を提供すること、およびそれを用いたプレミックスモルタルならびにそれらを用いたセメント硬化体を提供することを課題とする。 The present invention has been made as a result of various studies to solve the above-mentioned problems. While exhibiting the effect of suppressing high drying shrinkage, the premix is excellent in workability during fresh mortar while suppressing the decrease in strength. It is an object of the present invention to provide a drying shrinkage reducing agent composition for mortar, and to provide a premix mortar using the composition and a hardened cement body using the same.
本発明者らは、上記課題を解決するために鋭意研究を重ねた結果、固体のポリエチレングリコール（Ａ）特定量と、液体のポリエーテル（Ｂ１）を吸油性無機粉末（Ｂ２）に特定比率で含浸させたポリエーテル含浸粉末（Ｂ）特定量とからなるプレミックスモルタル用乾燥収縮低減剤組成物が上記の課題を解決することの知見を得て、本発明を完成するに至った。 As a result of intensive studies to solve the above problems, the present inventors have determined that a specific amount of solid polyethylene glycol (A) and liquid polyether (B1) are mixed with oil-absorbing inorganic powder (B2) at a specific ratio. Obtaining knowledge that a dry shrinkage reducing agent composition for premixed mortar composed of a specific amount of impregnated polyether impregnated powder (B) solves the above problems, the present invention has been completed.
すなわち、本発明は、次の（１）〜（３）である。
（１） 下記式（１）で表されるポリエチレングリコール（Ａ）３０〜９０質量％；および
ポリエーテル含浸粉末（Ｂ）１０〜７０質量％からなり、
前記ポリエーテル含浸粉末（Ｂ）が、式（２）で表されるポリエーテル（Ｂ１）と吸油性無機粉末（Ｂ２）からなり、前記ポリエーテルの前記吸油性無機粉末に対する質量比（（Ｂ１）／（Ｂ２））が４０／６０〜７０／３０であることを特徴とする、プレミックスモルタル用乾燥収縮低減剤組成物。
ＨＯ−（Ｃ２Ｈ４Ｏ）ａ−Ｈ ・・・（１）
（式（１）において、ａは、オキシエチレン基の平均付加モル数を表し、３５≦ａ≦５００である。
That is, this invention is following (1)-(3).
(1) Polyethylene glycol (A) represented by the following formula (1) 30 to 90% by mass; and polyether impregnated powder (B) 10 to 70% by mass,
The polyether-impregnated powder (B) comprises a polyether (B1) represented by the formula (2) and an oil-absorbing inorganic powder (B2), and the mass ratio of the polyether to the oil-absorbing inorganic powder ((B1) / (B2)) is 40/60 to 70/30, a drying shrinkage reducing agent composition for premixed mortar.
HO- (C 2 H 4 O) a-H ··· (1)
(In Formula (1), a represents the average addition mole number of an oxyethylene group, and is 35 <= a <= 500.
（式（２）において、Ｒ１、Ｒ２は、それぞれ独立して、水素原子、または炭素数２〜８のアルキル基を示す。
ＡＯは、炭素数２〜４のオキシアルキレン基の２種以上であって、ブロック状でもランダム状でも良い。
ｂは、炭素数２〜４のオキシアルキレン基の平均付加モル数であり、ｂ＝１〜１０を満たす。）
In (Equation (2), R 1, R 2 represents independently a hydrogen atom, or an alkyl group having 2 to 8 carbon atoms.
AO is two or more kinds of oxyalkylene groups having 2 to 4 carbon atoms, and may be block or random.
b is an average addition mole number of an oxyalkylene group having 2 to 4 carbon atoms, and satisfies b = 1 to 10. )
（２） セメント、水、骨材、膨張材、再乳化型粉末樹脂および（１）のプレミックスモルタル用乾燥収縮低減剤組成物を含有することを特徴とする、プレミックスモルタル。 (2) A premix mortar comprising a cement, water, an aggregate, an expansion material, a re-emulsifying powder resin, and the dry shrinkage reducing agent composition for premix mortar of (1).
（３） （２）のプレミックスモルタルを硬化させて得られたことを特徴とする、セメント硬化体。 (3) A hardened cement body obtained by curing the premixed mortar of (2).
本発明のプレミックスモルタル用乾燥収縮低減剤組成物を用いることにより、土木・建築分野において使用されるプレミックスモルタル（セメント硬化体）は、強度低下を起こすことなく乾燥ひび割れを防止することが可能となった。また、フレッシュモルタルの作業性が良好になり、施工性が向上された。 By using the dry shrinkage reducing agent composition for premix mortar according to the present invention, premix mortar (hardened cement) used in the civil engineering / architecture field can prevent dry cracking without causing a decrease in strength. It became. Moreover, the workability of the fresh mortar became good and the workability was improved.
本発明に用いるポリエチレングリコール（Ａ）は、固体の性状であり、式（１）ＨＯ−（Ｃ２Ｈ４Ｏ）ａ−Ｈ で表される構造を有する。 The polyethylene glycol (A) used in the present invention is a solid property and has a structure represented by the formula (1) HO— (C 2 H 4 O) a—H.
式（１）に示されるａは、オキシエチレン基の平均付加モル数を表す。ａは、３５≦ａ≦５００を示す。ａがこの範囲を外れると乾燥収縮低減効果が小さくなる。この観点からは、ａは、４０以上が好ましく、４５以上がさらに好ましく、５０以上が特に好ましい。また、ａは、３００以下が好ましく、２５０以下がより好ましく、２００以下が特に好ましい。 A shown in Formula (1) represents the average added mole number of an oxyethylene group. a represents 35 ≦ a ≦ 500. When a is outside this range, the drying shrinkage reduction effect is reduced. From this viewpoint, a is preferably 40 or more, more preferably 45 or more, and particularly preferably 50 or more. Further, a is preferably 300 or less, more preferably 250 or less, and particularly preferably 200 or less.
本発明に用いるポリエーテル含浸粉末（Ｂ）は、式（２）で表されるポリエーテル（Ｂ１）と吸油性無機粉末（Ｂ２）からなる。 The polyether-impregnated powder (B) used in the present invention comprises a polyether (B1) represented by the formula (2) and an oil-absorbing inorganic powder (B2).
＜ポリエーテル（Ｂ１）＞
本発明に用いるポリエーテル（Ｂ１）は、式（２）で表される。式（２）に示されるＲ１、Ｒ２は、それぞれ独立して、水素原子、または炭素数２〜８のアルキル基を表す。このアルキル基の炭素数は、３以上が好ましく、また６以下がさらに好ましい。アルキル基としては、例えば、エチル基、ｎ−プロピル基、イソプロピル基、ｎ−ブチル基、イソブチル基、ｔ−ブチル基、ｎ−ペンチル基、イソペンチル基、ｎ−ヘキシル基、イソヘキシル基、ｎ−ヘプチル基、イソヘプチル基、ｎ−オクチル基、イソオクチル基を表し、水素原子、ｎ−ブチル基、イソブチル基、ｔ−ブチル基が好ましく、水素原子、ｎ−ブチル基がより好ましい。
<Polyether (B1)>
The polyether (B1) used in the present invention is represented by the formula (2). R 1 and R 2 shown in Formula (2) each independently represent a hydrogen atom or an alkyl group having 2 to 8 carbon atoms. The alkyl group preferably has 3 or more carbon atoms, more preferably 6 or less. Examples of the alkyl group include ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, n-pentyl group, isopentyl group, n-hexyl group, isohexyl group, and n-heptyl. Group, isoheptyl group, n-octyl group and isooctyl group, a hydrogen atom, n-butyl group, isobutyl group and t-butyl group are preferred, and a hydrogen atom and n-butyl group are more preferred.
ＡＯは、炭素数２〜４のオキシアルキレン基の２種以上を表す。炭素数２のオキシアルキレン基はオキシエチレン基を表し、炭素数３のオキシアルキレン基はオキシプロピレン基を表し、炭素数４のオキシアルキレン基はオキシブチレン基またはオキシテトラメチレン基を表す。炭素数２〜４のオキシアルキレン基の全体モル量を１００モル％としたとき、炭素数２のオキシエチレン基の比率は３０〜７０モル％が好ましく、４０〜６０モル％がさらに好ましい。また、炭素数３のオキシプロピレン基の比率は２０〜６０モル％が好ましく、３０〜５５モル％がさらに好ましい。炭素数４のオキシアルキレン基の比率は０〜３０モル％が好ましく、０〜２０モル％がさらに好ましい。 AO represents 2 or more types of oxyalkylene groups having 2 to 4 carbon atoms. The oxyalkylene group having 2 carbon atoms represents an oxyethylene group, the oxyalkylene group having 3 carbon atoms represents an oxypropylene group, and the oxyalkylene group having 4 carbon atoms represents an oxybutylene group or an oxytetramethylene group. When the total molar amount of the oxyalkylene group having 2 to 4 carbon atoms is 100 mol%, the ratio of the oxyethylene group having 2 carbon atoms is preferably 30 to 70 mol%, and more preferably 40 to 60 mol%. Moreover, 20-60 mol% is preferable and, as for the ratio of a C3-oxypropylene group, 30-55 mol% is more preferable. The proportion of oxyalkylene groups having 4 carbon atoms is preferably 0 to 30 mol%, more preferably 0 to 20 mol%.
ｂは、炭素数２〜４のオキシアルキレン基の平均付加モル数であり、ｂ＝１〜１０を満たし、重合形態は特に限定されず、ランダム共重合、ブロック共重合、ランダム共重合／ブロック共重合であって良い。ｂが１０を超えると、乾燥収縮低減効果が小さくなるので１０以下とするが、６以下がさらに好ましい。また、ｂは１以上とするが、３以上がさらに好ましい。 b is the average number of moles added of oxyalkylene groups having 2 to 4 carbon atoms, satisfies b = 1 to 10, and the polymerization form is not particularly limited, and random copolymerization, block copolymerization, random copolymerization / block copolymerization. It may be polymerization. If b exceeds 10, the effect of reducing drying shrinkage becomes small, so it is 10 or less, but 6 or less is more preferable. Further, b is 1 or more, but 3 or more is more preferable.
＜吸油性無機粉末（Ｂ２）＞
本発明に用いる吸油性無機粉末は、吸油性を有するものであれば何でもよく、例えば繊維状マグネシウムオキシサルフェート、パーライト、炭酸カルシウム、高炉スラグ、シリカ、フライアッシュ、ケイ酸カルシウム水和物等が挙げられる。好ましくはシリカであり、より好ましくは、ＢＥＴ法による比表面積が５０〜４００ｍ２／ｇ、コールターカウンター法による平均粒径２０μｍ以下である多孔質シリカ微粉末である。
<Oil-absorbing inorganic powder (B2)>
The oil-absorbing inorganic powder used in the present invention may be any oil-absorbing inorganic powder such as fibrous magnesium oxysulfate, pearlite, calcium carbonate, blast furnace slag, silica, fly ash, calcium silicate hydrate and the like. It is done. Silica is preferred, and more preferred is a fine porous silica powder having a specific surface area of 50 to 400 m 2 / g by BET method and an average particle size of 20 μm or less by Coulter counter method.
＜ポリエーテル含浸粉末（Ｂ）＞
本発明に用いるポリエーテル含浸粉末（Ｂ）は、ポリエーテル（Ｂ１）と吸油性無機粉末（Ｂ２）との質量比（Ｂ１）／（Ｂ２）が４０／６０〜７０／３０であり、好ましくは５０／５０〜６５／３５である。上記質量比がこの範囲を外れ、ポリエーテル（Ｂ１）が少ない場合、ポリエーテル含浸粉末（Ｂ）の添加量あたりの収縮低減性能が低下するため好ましくなく、ポリエーテル（Ｂ２）が多い場合、ポリエーテル含浸粉末（Ｂ）が塊状になり、プレミックスモルタルに混合しにくくなるので好ましくない。
<Polyether impregnated powder (B)>
The polyether-impregnated powder (B) used in the present invention has a mass ratio (B1) / (B2) of the polyether (B1) to the oil-absorbing inorganic powder (B2) of 40/60 to 70/30, preferably 50/50 to 65/35. When the mass ratio is out of this range and the polyether (B1) is small, the shrinkage reduction performance per added amount of the polyether-impregnated powder (B) is deteriorated, which is not preferable. When the polyether (B2) is large, This is not preferable because the ether-impregnated powder (B) is agglomerated and difficult to mix with the premix mortar.
ポリエーテル含浸粉末（Ｂ）は、ポリエーテル（Ｂ１）と吸油性無機粉末（Ｂ２）とを上記所定量混合することによって、すなわち液体の（Ｂ１）が固体の（Ｂ２）に含浸されることで、得られる。混合の方法としては、吸油性無機粉末（Ｂ２）を混練機等で撹拌し、そこにポリエーテル（Ｂ１）を添加し、さらに撹拌を続けることで得られる。 The polyether-impregnated powder (B) is obtained by mixing the predetermined amount of the polyether (B1) and the oil-absorbing inorganic powder (B2), that is, the liquid (B1) is impregnated into the solid (B2). ,can get. As a mixing method, the oil-absorbing inorganic powder (B2) is obtained by stirring with a kneader or the like, adding the polyether (B1) thereto, and further continuing stirring.
＜プレミックスモルタル用乾燥収縮低減剤組成物＞
プレミックスモルタル用乾燥収縮低減剤中組成物の（Ａ）と（Ｂ）との配合量はそれぞれ、（Ａ）が３０〜９０質量％、（Ｂ）が１０〜７０質量％である。Ａが３０質量％より少ない場合や９０質量％より多い場合では、複合効果が得られず乾燥収縮低減効果も小さくなる。また、Ａが９０質量％より多いと強度発現が改善されない。（Ａ）の配合量は、４０〜７０質量％がさらに好ましく、（Ｂ）の配合量は、６０〜３０質量％がさらに好ましい。
<Drying shrinkage reducing agent composition for premix mortar>
The blending amounts of (A) and (B) in the composition for drying shrinkage reducing agent for premix mortar are (A) 30 to 90% by mass and (B) 10 to 70% by mass, respectively. When A is less than 30% by mass or more than 90% by mass, the composite effect cannot be obtained, and the drying shrinkage reducing effect is reduced. On the other hand, when A is more than 90% by mass, strength development is not improved. The blending amount of (A) is more preferably 40 to 70% by mass, and the blending amount of (B) is more preferably 60 to 30% by mass.
本発明のプレミックスモルタル用乾燥収縮低減剤組成物の添加量は、ミキサ混練りによる混和の場合、水硬性材料であるセメント類１００質量部に対して、１質量部〜１０質量部が好ましく、２質量部〜８質量部がさらに好ましく、３質量部〜８質量部が特に好ましい。 The amount of addition of the drying shrinkage reducing agent composition for premix mortar of the present invention is preferably 1 part by mass to 10 parts by mass with respect to 100 parts by mass of cement which is a hydraulic material in the case of mixing by mixer kneading. 2 mass parts-8 mass parts are further more preferable, and 3 mass parts-8 mass parts are especially preferable.
本発明のプレミックスモルタル用乾燥収縮低減剤組成物の使用方法は、特に限定されない。ミキサにより混和する場合は、セメント類、骨材、水に個々に添加しても良く、単独に添加し混練りしても良い。 The usage method of the drying shrinkage reducing agent composition for premix mortar of the present invention is not particularly limited. When mixing with a mixer, it may be added individually to cements, aggregates and water, or may be added alone and kneaded.
本発明で使用するセメントとしては、普通、早強、超早強、低熱、および中庸熱のポルトランドセメントや、これらポルトランドセメントに、高炉スラグ、フライアッシュ、又はシリカを混合した各種混合セメント、エコセメント、白色セメント、超速硬セメント、シリカフューム、フライアッシュ、およびけい酸白土等のポゾラン反応を有するものや高炉スラグ微粉末等を混和したポルトランドセメント、並びに、石灰石微粉末等を混合したフィラーセメント、アルミナセメント、マグネシアセメント、白セメント等などが挙げられる。 As the cement used in the present invention, normal, early strength, very early strength, low heat, and moderate heat Portland cement, various mixed cements and eco-cements in which these Portland cements are mixed with blast furnace slag, fly ash, or silica are used. , White cement, super hard cement, silica fume, fly ash, and portland cement mixed with blast furnace slag fine powder, etc., and filler cement mixed with fine limestone powder, alumina cement, etc. , Magnesia cement, white cement and the like.
本発明で使用する骨材としては、通常のモルタルに使用できるものであれば特に限定されるものではなく、川砂、陸砂、砕砂、硅砂および海砂等の細骨材が挙げられる。骨材の使用量は、セメント類１００質量部に対して、５０〜３００質量部が好ましく、８０〜２５０質量部がより好ましい。 The aggregate used in the present invention is not particularly limited as long as it can be used in ordinary mortar, and examples thereof include fine aggregates such as river sand, land sand, crushed sand, dredged sand, and sea sand. 50-300 mass parts is preferable with respect to 100 mass parts of cement, and, as for the usage-amount of aggregate, 80-250 mass parts is more preferable.
本発明で使用する膨張材としては、カルシウムスルホアルミネート系、石灰系、あるいはそれらの複合系が挙げられる。膨張材の使用量は、セメント類１００質量部に対して１〜１０質量部が好ましく、２〜８質量部がより好ましい。 Examples of the expansion material used in the present invention include calcium sulfoaluminate, lime, and composites thereof. 1-10 mass parts is preferable with respect to 100 mass parts of cements, and, as for the usage-amount of an expandable material, 2-8 mass parts is more preferable.
本発明で使用する再乳化型粉末樹脂としては、乾燥することによってポリマー皮膜を形成し得るものであれば、アニオン性、カチオン性、およびノニオン性のどのようなイオン性でも良い。具体的には、エチレン−酢酸ビニル共重合体、酢酸ビニル・ベオバ・アクリル共重合体、メタクリル酸アルキルエステルとアクリル酸アルキルエステルの共重合体、スチレンとアクリル酸アルキルエステルの共重合体等が挙げられる。 The re-emulsifying powder resin used in the present invention may be any ionic property such as anionic, cationic and nonionic as long as it can form a polymer film by drying. Specifically, ethylene-vinyl acetate copolymer, vinyl acetate / veova / acrylic copolymer, copolymer of alkyl methacrylate and alkyl acrylate, copolymer of styrene and alkyl acrylate, etc. It is done.
本発明の再乳化型粉末樹脂の使用量は、セメント類１００質量部に対して、１〜２０質量部が好ましく、１〜１５質量部がより好ましく、１〜１０質量部がさらに好ましい。 1-20 mass parts is preferable with respect to 100 mass parts of cement, as for the usage-amount of the re-emulsification type powder resin of this invention, 1-15 mass parts is more preferable, and 1-10 mass parts is further more preferable.
また、本発明のプレミックスモルタルには公知の添加剤（材）や無機フィラーを使用することができる。一例を挙げれば、ＡＥ剤、流動化剤、遅延剤、早強剤、促進剤、起泡剤、保水剤、増粘剤、防水剤、撥水剤、分離抵抗抑制剤、減水剤、高性能減水剤、消泡剤、珪石粉末、高炉スラグ、フライアッシュ、シリカフューム、石膏等が挙げられる。 Moreover, a well-known additive (material) and an inorganic filler can be used for the premix mortar of this invention. For example, AE agent, fluidizer, retarder, early strengthener, accelerator, foaming agent, water retention agent, thickener, waterproofing agent, water repellent, separation resistance inhibitor, water reducing agent, high performance Water reducing agents, antifoaming agents, silica stone powder, blast furnace slag, fly ash, silica fume, gypsum and the like can be mentioned.
本発明でプレミックスモルタルの調製に使用する水の量は、セメント以外の併用する材料によって変化するため、一義的に決定することはむずかしいが、通常、セメント類１００質量部に対して、２０〜６０質量部が好ましく、２５〜５５質量部がより好ましい。 In the present invention, the amount of water used for the preparation of the premix mortar varies depending on the materials used in combination other than cement, and therefore it is difficult to determine uniquely, but usually 20 to 100 parts by mass of cement. 60 mass parts is preferable and 25-55 mass parts is more preferable.
本発明では、セメントなどの投入・混合方法は均一に分散・混合できれば特に限定されるものではない。セメントなどを投入・混合し、打設し、養生してセメント硬化体を調製することができる。 In the present invention, the method for charging and mixing cement and the like is not particularly limited as long as it can be uniformly dispersed and mixed. Cement and the like can be charged, mixed, placed, cured, and cured cement can be prepared.
以下、本発明を実施例に基づいて説明する。
＜測定方法＞
本発明において、プレミックスモルタルおよびセメント硬化体の評価に用いた測定方法は、次の通りである。
フロー：ＪＩＳ Ｒ ５２０１「セメントの物理試験方法」に準じて行った。
作業性：コンクリート板上にモルタルを鏝で均したときの状態により評価した。
◎：良好、 ○：普通、 △：伸びが悪い
乾燥収縮率：ＪＩＳ Ａ １１２９−３「モルタルおよびコンクリートの長さ変化試験方法、ダイヤルゲージ法」に準じ、脱型後を基長として、２３±２℃ ５３％ＲＨにて養生し、２８日後の長さ変化を測定した。
圧縮強度比：ＪＩＳ Ｒ ５２０１「セメントの物理試験方法 付属書２」に準じ、脱型後、２０±１℃の水中にて養生し、２８日後の圧縮強度比を測定した。圧縮強度比は、各評価配合においてプレミックスモルタル組成物を用いない場合の評価結果に対する相対値（％）で表した。
Hereinafter, the present invention will be described based on examples.
<Measurement method>
In the present invention, the measurement method used for the evaluation of the premix mortar and the cement hardened body is as follows.
Flow: Measured according to JIS R 5201 “Cement physical test method”.
Workability: Evaluated based on the condition when the mortar was leveled on a concrete plate with a pestle.
◎: Good, ○: Normal, △: Poor elongation Drying shrinkage: 23 ± in accordance with JIS A 1129-3 “Testing method for mortar and concrete length change, dial gauge method” Curing was performed at 2 ° C. and 53% RH, and the length change after 28 days was measured.
Compressive strength ratio: According to JIS R 5201 “Cement physical test method appendix 2”, after demolding, it was cured in water at 20 ± 1 ° C., and the compressive strength ratio after 28 days was measured. The compression strength ratio was expressed as a relative value (%) with respect to the evaluation result when the premix mortar composition was not used in each evaluation formulation.
＜プレミックスモルタルの作製およびセメント硬化体の評価＞
本発明のプレミックスモルタル用乾燥収縮低減剤組成物を用いたプレミックスモルタル、およびそれ以外のプレミックスモルタルについて、普通ポルトランドセメントを用いた評価系（実施例１−１〜３、比較例１−１〜４）および早強ポルトランドセメントを用いた評価系（実施例２−１〜３、比較例２−１〜４）の２つの評価系において評価を行った。両評価系において、相対的な評価の基準には、それぞれ比較例１−１および比較例２−１として、各本発明のプレミックスモルタル組成物を用いない配合評価を行った。
<Premix mortar preparation and cement hardened body evaluation>
About premix mortar using the drying shrinkage reducing agent composition for premix mortar of the present invention, and other premix mortar, evaluation systems using ordinary Portland cement (Examples 1-1 to 1-3, Comparative Example 1) Evaluation was carried out in two evaluation systems (1-4) and evaluation systems using early strong Portland cement (Examples 2-1 to 3 and Comparative Examples 2-1 to 4). In both evaluation systems, as comparative examples 1-1 and 2-1 as relative evaluation criteria, a combination evaluation without using the premix mortar composition of the present invention was performed.
プレミックスモルタルの配合およびセメント硬化体の評価結果を表３（普通ポルトランドセメントを用いた評価系）および表４（早強ポルトランドセメントを用いた評価系）に示す。 Table 3 (Evaluation system using ordinary Portland cement) and Table 4 (Evaluation system using early-strength Portland cement) show the premixed mortar composition and the evaluation results of the hardened cement.
［１．普通ポルトランドセメントを用いた評価系（実施例１−１〜３、比較例１−１〜４）］
＜プレミックスモルタルの作製方法＞
セメント１００質量部、細骨材２００質量部に対して、水５２質量部を使用し、ＪＩＳ Ａ １１７１のポリマーセメントモルタルの試験方法に準じて練混ぜを行い、モルタルとした。なお、プレミックスモルタル用乾燥収縮低減剤は、水の外割り添加とし、セメント１００質量部に対する添加量とし、２８日後の乾燥収縮率が０．０５％以下となるような添加量とした。ただし、大量に添加をしても２８日後乾燥収縮率が０．０５％以下にならないプレミックスモルタル用乾燥収縮低減剤に関しては、実施例１と同様の添加量とした。
[1. Evaluation system using ordinary Portland cement (Examples 1-1 to 3, Comparative Examples 1-1 to 4)]
<Premix mortar production method>
Using 52 parts by mass of water with respect to 100 parts by mass of cement and 200 parts by mass of fine aggregate, kneading was performed according to the test method for polymer cement mortar of JIS A 1171 to obtain a mortar. In addition, the drying shrinkage reducing agent for premix mortar was added outside of water and added to 100 parts by mass of cement, and was added so that the drying shrinkage after 28 days was 0.05% or less. However, with respect to the dry shrinkage reducing agent for premix mortar whose drying shrinkage ratio does not become 0.05% or less after 28 days even if a large amount is added, the same addition amount as in Example 1 was used.
＜使用材料＞
セメント： 普通ポルトランドセメント
細骨材 ：東北硅砂製、「６号硅砂」
水 ： 水道水
シリカ＊１ ： デグッサエボニックジャパン製、「カープレックス＃８０」（ＢＥＴ法による比表面積：２０３ｍ２／ｇ、コールターカウンター法による平均粒子径：７．５μｍ）。
本発明例および比較例のプレミックスモルタル用乾燥収縮低減剤として、表１に示される式（１）の化合物、および表２に示される式（２）の化合物を使用した。
<Materials used>
Cement: Ordinary Portland cement Fine aggregate: “No. 6 cinnabar” made by Tohoku cinnabar
Water: Tap water Silica * 1: Made by Degussa Evonik Japan, “Carplex # 80” (specific surface area by BET method: 203 m 2 / g, average particle diameter by Coulter counter method: 7.5 μm).
As the drying shrinkage reducing agent for premixed mortars of the inventive examples and comparative examples, the compounds of the formula (1) shown in Table 1 and the compounds of the formula (2) shown in Table 2 were used.
［２．早強ポルトランドセメントを用いた評価系（実施例２−１〜３、比較例２−１〜４）］
＜プレミックスモルタルの作製方法＞
早強セメント９５質量部、膨張材５質量部、細骨材２００質量部、再乳化型粉末樹脂５質量部に対して、水５０質量部を使用し、ＪＩＳ Ａ １１７１のポリマーセメントの試験方法に準じて練混ぜを行い、モルタルとした。なお、プレミックスモルタル用乾燥収縮低減剤は、水の外割り添加とし、早強セメントと膨張材の総量に対する添加量とし、２８日後の乾燥収縮率が０．０５％以下となるような添加量とした。
[2. Evaluation system using early-strength Portland cement (Examples 2-1 to 3, Comparative Examples 2-1 to 4)]
<Premix mortar production method>
50 parts by mass of water is used for 95 parts by mass of early cement, 5 parts by mass of expansion material, 200 parts by mass of fine aggregate, and 5 parts by mass of re-emulsifying powder resin. According to this, kneading was performed to obtain a mortar. In addition, the drying shrinkage reducing agent for premix mortar is added outside the water, added to the total amount of the early strong cement and the expansion material, and added in such a way that the drying shrinkage after 28 days is 0.05% or less. It was.
＜使用材料＞
セメント： 太平洋セメント（株）製、「早強ポルトランドセメント」
膨張材： 電気化学工業（株）製、「デンカＣＳＡ＃１０」
細骨材 ： 東北硅砂（株）製、「６号硅砂」
再乳化型粉末樹脂： 日本合成化学（株）製、「モビニール・パウダーＬＤＭ７０００Ｐ」（アクリル酸エステル・メタクリル酸エステル共重合樹脂）
水 ： 水道水
シリカ＊１ ： デグッサエボニックジャパン製、「カープレックス＃８０」（ＢＥＴ法による比表面積：２０３ｍ２／ｇ、コールターカウンター法による平均粒子径：７．５μｍ）
本発明例および比較例のプレミックスモルタル用乾燥収縮低減剤として、表１に示される式（１）の化合物 および表２に示される式（２）の化合物を使用した。
<Materials used>
Cement: Taiheiyo Cement Co., Ltd.
Expansion material: Denka CSA # 10, manufactured by Denki Kagaku Kogyo Co., Ltd.
Fine aggregate: “No. 6 cinnabar”, manufactured by Tohoku Sauna Co., Ltd.
Re-emulsification type powder resin: “Movinyl Powder LDM7000P” (acrylic ester / methacrylic ester copolymer resin) manufactured by Nippon Synthetic Chemical Co., Ltd.
Water: Tap water Silica * 1: Made by Degussa Evonik Japan, “Carplex # 80” (specific surface area by BET method: 203 m 2 / g, average particle diameter by Coulter counter method: 7.5 μm)
As the dry shrinkage reducing agent for premixed mortars of the inventive examples and comparative examples, the compounds of the formula (1) shown in Table 1 and the compounds of the formula (2) shown in Table 2 were used.
表２中の略号の意味は次の通りである。
＊ 「／」はランダム状付加を示す。
The meanings of the abbreviations in Table 2 are as follows.
* “/” Indicates random addition.
上記のモルタルを４×４×１６ｃｍのゲージプラグ付き金型に充填し、養生温度を２０℃とし、材齢１日で脱型し基長の測定を行った。その後２３±２℃ ５３％ＲＨにて養生し、乾燥収縮率を測定した。また、同様のモルタルを４×４×１６ｃｍの金型に充填し、脱型後、２０±１℃の水中にて養生し、圧縮強度比を測定した。 The above mortar was filled in a 4 × 4 × 16 cm die with a gauge plug, the curing temperature was 20 ° C., the mold was removed at 1 day of age, and the base length was measured. Thereafter, the film was cured at 23 ± 2 ° C. and 53% RH, and the drying shrinkage was measured. Further, the same mortar was filled in a 4 × 4 × 16 cm mold, removed from the mold, cured in water at 20 ± 1 ° C., and the compression strength ratio was measured.
実施例１−１〜１−３、および２−１〜２−３より、本発明のプレミックスモルタル用乾燥収縮低減剤を用いると、圧縮強度の低下無しに目標の乾燥収縮率０．０５％以下を達成できることがわかる。 From Examples 1-1 to 1-3 and 2-1 to 2-3, when the drying shrinkage reducing agent for premixed mortar of the present invention is used, the target drying shrinkage ratio is 0.05% without a decrease in compressive strength. It can be seen that the following can be achieved.
比較例１−１、比較例２−１では、（Ａ）成分、（Ｂ）成分を配合しなかったが、乾燥収縮率が大きかった。
比較例１−２、２−２では、（Ａ）成分を配合し、（Ｂ）成分を配合しなかったが、圧縮強度が低下していた。
比較例１−３では、（Ａ）成分を配合せず、（Ｂ）成分を配合したが、（Ｂ）成分を多量に添加したにもかかわらず、作業性が悪く、目標の乾燥収縮率を達成できなかった。
比較例２−３では、（Ａ）成分を配合せず、（Ｂ）成分を配合したが、（Ｂ）成分を多量に添加したにもかかわらず、作業性が悪かった。
比較例１−４では、（Ａ）成分／（Ｂ）成分の比率を本発明外としたが、目標の乾燥収縮率を達成できないだけでなく、圧縮強度も低下し、作業性も悪かった。
比較例２−４では、（Ａ）成分：（Ｂ）成分の比率を本発明外としたが、圧縮強度が低下し、作業性も悪かった。
In Comparative Example 1-1 and Comparative Example 2-1, the component (A) and the component (B) were not blended, but the drying shrinkage ratio was large.
In Comparative Examples 1-2 and 2-2, the component (A) was blended and the component (B) was not blended, but the compressive strength was reduced.
In Comparative Example 1-3, the component (A) was not blended, but the component (B) was blended, but despite the large amount of the component (B) added, workability was poor and the target drying shrinkage ratio was reduced. Could not be achieved.
In Comparative Example 2-3, the component (A) was not blended and the component (B) was blended, but the workability was poor despite the large amount of the component (B) added.
In Comparative Example 1-4, the ratio of the component (A) / the component (B) was excluded from the present invention, but not only the target drying shrinkage rate could not be achieved, but also the compressive strength was lowered and the workability was also poor.
In Comparative Example 2-4, the ratio of the component (A) to the component (B) was outside the range of the present invention, but the compression strength was lowered and the workability was poor.
以上のとおり、本発明のプレミックスモルタル用乾燥収縮低減剤を用いることにより、強度低下が改善され、安定したひび割れ抵抗性が高いセメント硬化体が得られる。また、フレッシュモルタルが取り扱いやすく、作業性、施工性が向上する。 As described above, by using the drying shrinkage reducing agent for premix mortar according to the present invention, a reduction in strength is improved, and a stable cement cured body having high crack resistance is obtained. In addition, fresh mortar is easy to handle, improving workability and workability.
Claims (3)
ポリエーテル含浸粉末（Ｂ）１０〜７０質量％からなり、
前記ポリエーテル含浸粉末（Ｂ）が、式（２）で表されるポリエーテル（Ｂ１）と吸油性無機粉末（Ｂ２）からなり、前記ポリエーテルの前記吸油性無機粉末に対する質量比（（Ｂ１）／（Ｂ２））が４０／６０〜７０／３０であることを特徴とする、プレミックスモルタル用乾燥収縮低減剤組成物。
ＨＯ−（Ｃ２Ｈ４Ｏ）ａ−Ｈ ・・・（１）
（式（１）において、ａは、オキシエチレン基の平均付加モル数を表し、３５≦ａ≦５００である。）
ＡＯは、炭素数２〜４のオキシアルキレン基の２種以上であって、ブロック状でもランダム状でも良い。
ｂは、炭素数２〜４のオキシアルキレン基の平均付加モル数であり、ｂ＝１〜１０を満たす。） Polyethylene glycol (A) represented by the following formula (1) 30 to 90% by mass; and polyether impregnated powder (B) 10 to 70% by mass,
The polyether-impregnated powder (B) comprises a polyether (B1) represented by the formula (2) and an oil-absorbing inorganic powder (B2), and the mass ratio of the polyether to the oil-absorbing inorganic powder ((B1) / (B2)) is 40/60 to 70/30, a drying shrinkage reducing agent composition for premixed mortar.
HO- (C 2 H 4 O) a-H ··· (1)
(In Formula (1), a represents the average added mole number of an oxyethylene group, and is 35 <= a <= 500.)
AO is two or more kinds of oxyalkylene groups having 2 to 4 carbon atoms, and may be block or random.
b is an average addition mole number of an oxyalkylene group having 2 to 4 carbon atoms, and satisfies b = 1 to 10. )
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017081783A (en) * | 2015-10-28 | 2017-05-18 | 株式会社日本触媒 | Aggregate composition for premixed cement |
| JP2017178666A (en) * | 2016-03-30 | 2017-10-05 | 日油株式会社 | Powder dry shrinkage reduction agent for premixed mortar, premixed mortar and cement cured body |
| JP2017214236A (en) * | 2016-05-31 | 2017-12-07 | 日油株式会社 | Powdery additive for premixed repair mortar, premixed repair mortar, and cement hardened body |
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| JPH09301758A (en) * | 1996-05-10 | 1997-11-25 | Nof Corp | Hydraulic material composition and molded body |
| JP2002068813A (en) * | 2000-08-30 | 2002-03-08 | Denki Kagaku Kogyo Kk | Cement composition |
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| JPH02164754A (en) * | 1988-12-16 | 1990-06-25 | Nippon Cement Co Ltd | Cement additive for reducing shrinkage |
| JPH09301758A (en) * | 1996-05-10 | 1997-11-25 | Nof Corp | Hydraulic material composition and molded body |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2017081783A (en) * | 2015-10-28 | 2017-05-18 | 株式会社日本触媒 | Aggregate composition for premixed cement |
| JP2017178666A (en) * | 2016-03-30 | 2017-10-05 | 日油株式会社 | Powder dry shrinkage reduction agent for premixed mortar, premixed mortar and cement cured body |
| JP2017214236A (en) * | 2016-05-31 | 2017-12-07 | 日油株式会社 | Powdery additive for premixed repair mortar, premixed repair mortar, and cement hardened body |
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