JP2007261845A - Hydraulic composition - Google Patents
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- JP2007261845A JP2007261845A JP2006087351A JP2006087351A JP2007261845A JP 2007261845 A JP2007261845 A JP 2007261845A JP 2006087351 A JP2006087351 A JP 2006087351A JP 2006087351 A JP2006087351 A JP 2006087351A JP 2007261845 A JP2007261845 A JP 2007261845A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、低温環境下において優れた流動性、強度発現性及び寸法安定性を有し、グラウト材として好適に用いられる水硬性組成物に関する。 The present invention relates to a hydraulic composition that has excellent fluidity, strength development and dimensional stability in a low temperature environment, and is suitably used as a grout material.
土木工事或いは建築工事では、構造物などの隙間を埋めるために、充填材又はグラウト材と呼ばれるセメントモルタル系の水硬性組成物が広く用いられている。
低温環境下においても強度発現性に優れ、流動性の良好なグラウト材として、特許文献１にセメント、膨張材、減水剤及び水を含有し、固形成分中の粒子径が５μｍ以下の粒子の容積が４５％以上であるグラウト材が開示されている。
In civil engineering work or building work, cement mortar hydraulic compositions called fillers or grout materials are widely used to fill gaps in structures and the like.
Patent Document 1 contains cement, an expanding material, a water reducing agent, and water as a grout material having excellent strength development and fluidity even in a low temperature environment, and the volume of particles having a particle diameter of 5 μm or less in a solid component A grout material is disclosed that is 45% or more.
土木・建築分野において使用され、低温時の強度発現性が良好なコンクリートが得られるセメント組成物として、特許文献２および特許文献３に、３ＣａＯ・ＳｉＯ２含有量が６０重量％以上のポルトランドセメント、無水セッコウ、ギ酸類、減水剤を含有したセメント組成物が開示されている。 As cement compositions used in the field of civil engineering / architecture and capable of obtaining concrete having good strength development at low temperatures, Patent Document 2 and Patent Document 3 describe Portland cement having a 3CaO · SiO 2 content of 60% by weight or more, A cement composition containing anhydrous gypsum, formic acid, and a water reducing agent is disclosed.
グラウト材の主要成分であるセメント等の水硬性成分の水和反応は、使用する温度条件に影響を受け、低温環境下では強度発現性の低下が見られ、特に初期材齢において所定の強度を得ることが難しい場合も発生している。
本発明は、低温環境下において、優れた流動性、強度発現性及び寸法安定性を有するグラウト材を提供することを目的とした。
The hydration reaction of hydraulic components such as cement, which is the main component of the grout material, is affected by the temperature conditions to be used, and a decrease in strength develops under low temperature environments. Sometimes it is difficult to get.
An object of the present invention is to provide a grout material having excellent fluidity, strength development and dimensional stability in a low temperature environment.
本発明者は、このような低温環境下で使用するグラウト材に関する課題について鋭意研究を重ね、ポルトランドセメント、骨材、流動化剤、無機系膨張材、金属系膨張材及び凝結調整剤を含み、特定の膨張材と凝結調整剤とを組合わせて用いることにより、低温環境下においても強度発現性に優れ、さらに流動性及び寸法安定性にも優れたグラウト材が得られることを見出して本発明を完成した。 The present inventor repeated earnest studies on the problems related to the grout material to be used in such a low temperature environment, including Portland cement, aggregate, fluidizing agent, inorganic expansion material, metallic expansion material and setting modifier, The present invention finds that by using a combination of a specific expansion material and a setting modifier, it is possible to obtain a grout material that is excellent in strength development even in a low-temperature environment, and further excellent in fluidity and dimensional stability. Was completed.
すなわち、本発明は、ポルトランドセメント、凝結調整剤、無機系膨張材、金属系膨張材及び細骨材を含む水硬性組成物であり、凝結調整剤がギ酸塩及び硫酸アルミニウムより選ばれる成分を少なくとも１種含む水硬性組成物に関するものである。 That is, the present invention is a hydraulic composition containing Portland cement, a setting modifier, an inorganic expansion material, a metal expansion material and a fine aggregate, and the setting adjustment agent contains at least a component selected from formate and aluminum sulfate. The present invention relates to a hydraulic composition containing one kind.
以下に本発明の水硬性組成物の好ましい様態を示し、本発明ではこれらを複数組合わせることができる。
１）ポルトランドセメント１００質量部に対して、凝結調整剤が０．３〜５質量部であること。
２）ギ酸塩が、ギ酸カルシウム、ギ酸マグネシウム及びギ酸ナトリウムより選ばれる少なくとも１種であること。
３）水硬性組成物が、さらに、ポリカルボン酸系流動化剤を含むこと。
４）水硬性組成物と水とを混練したグラウトモルタルであって、５℃で養生した材齢１日のグラウトモルタル硬化体の圧縮強度が、４．５Ｎ／ｍｍ２以上であること。
５）水硬性組成物と水との配合物を硬化させて得られるグラウトモルタル硬化体であること。
The preferable aspect of the hydraulic composition of this invention is shown below, In this invention, these can be combined multiplely.
1) A setting regulator is 0.3-5 mass parts with respect to 100 mass parts of Portland cement.
2) The formate is at least one selected from calcium formate, magnesium formate and sodium formate.
3) The hydraulic composition further contains a polycarboxylic acid-based fluidizing agent.
4) A grout mortar obtained by kneading a hydraulic composition and water, and the compressive strength of a 1-day-old grout mortar cured at 5 ° C. is 4.5 N / mm 2 or more.
5) A grout mortar cured product obtained by curing a blend of a hydraulic composition and water.
本発明のグラウト材は、低温環境下において、流動性、強度発現性及び寸法安定性に優れた水硬性組成物であり、例えば気温５℃といった低温環境下において、土木工事或いは建築工事に用いられる充填材やグラウト材としての要求性能を兼ね備えていて好適に用いられる。 The grout material of the present invention is a hydraulic composition excellent in fluidity, strength development and dimensional stability in a low temperature environment, and is used for civil engineering or construction work in a low temperature environment such as a temperature of 5 ° C. It has the required performance as a filler or grout material and is preferably used.
本発明の水硬性組成物に係るポルトランドセメントは、特に限定されるものではなく、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメントが用いられ、またポルトランドセメントに高炉スラグ、シリカフューム、フライアッシュ、石灰石微粉末等を混合した高炉セメントやフライアッシュセメントなどの混合セメントも用いることができる。
本発明の水硬性組成物は、特に低温環境下で用いることから、強度発現性が良好な早強ポルトランドセメントや超早強ポルトランドセメントを使用することが好ましい。
The Portland cement according to the hydraulic composition of the present invention is not particularly limited, and ordinary Portland cement, early-strength Portland cement, super-early-strength Portland cement, medium-heated Portland cement, low-heat Portland cement, and Portland cement are used. It is also possible to use mixed cements such as blast furnace cement and fly ash cement in which blast furnace slag, silica fume, fly ash, fine limestone powder and the like are mixed.
Since the hydraulic composition of the present invention is used particularly in a low-temperature environment, it is preferable to use early-strength Portland cement or super-early-strength Portland cement having good strength development.
本発明の水硬性組成物は、ポルトランドセメント１００質量部に対し、細骨材を好ましくは３０〜３００質量部、さらに好ましくは４０〜２５０質量部、より好ましくは５０〜２２０質量部、特に好ましくは６０〜２００質量部を配合する。 The hydraulic composition of the present invention is preferably 30 to 300 parts by mass, more preferably 40 to 250 parts by mass, more preferably 50 to 220 parts by mass, and particularly preferably 100 parts by mass of Portland cement. 60-200 mass parts is mix | blended.
本発明に係る細骨材として、粒度が３．５ｍｍ以下の珪砂、川砂、陸砂、海砂、砕砂などを用いることができる。 As fine aggregates according to the present invention, silica sand, river sand, land sand, sea sand, crushed sand and the like having a particle size of 3.5 mm or less can be used.
細骨材の粒度は、３．５ｍｍ以下のものを用いることが好ましく、細骨材１００質量％中に、粒径０．１５〜２ｍｍの細骨材が好ましくは６０質量％以上であり、さらに好ましくは６５質量％以上、特に好ましくは７０質量％以上含むものを用いることにより、優れた流動性のグラウトモルタルを得られる。 The particle size of the fine aggregate is preferably 3.5 mm or less, and the fine aggregate having a particle size of 0.15 to 2 mm is preferably 60% by mass or more in 100% by mass of the fine aggregate. An excellent fluid grout mortar can be obtained by using a material containing preferably 65% by mass or more, particularly preferably 70% by mass or more.
本発明に係る無機系膨張材及び金属系膨張材は、グラウトモルタルの硬化過程で生じる体積変化を補償し、グラウトモルタル硬化体の寸法安定性の向上に不可欠なものであり、建築物や構造物との密着性向上に有効である。 The inorganic expansive material and the metal expansive material according to the present invention are indispensable for improving the dimensional stability of the grout mortar cured body by compensating for the volume change that occurs during the curing process of the grout mortar. It is effective for improving the adhesion.
無機系膨張材は、カルシウムサルフォアルミネート系としては、アウイン、石灰系としては生石灰、生石灰−石膏系、仮焼ドロマイト等が挙げられ、これらから選ばれた少なくとも１種を使用できる。石灰系膨張材としては、生石灰、生石灰−石膏系が好ましく、特に生石灰−石膏系が好ましい。
無機系膨張材としては、例えば遊離生石灰を膨張成分として含むものや、カルシウムサルホアルミネート等のエトリンガイト形成物質を膨張成分とする市販品を使用することができる。好ましくは、収縮補償効果とともに反応時の水和発熱によって低温環境下の強度増強効果を有する生石灰を有効成分として含む膨張材が特に好ましく、この場合膨張材中の生石灰含有量は特に限定されないが、生石灰含有量が高いもの（１００重量％を含む）では水和反応が急激に進行することがあるので８０重量％以下の含有量がよい。
無機系膨張材の添加量は、ポルトランドセメント１００質量部に対して、好ましくは１〜３０質量部、さらに好ましくは２〜２５質量部、より好ましくは３〜２０質量部、特に４〜１５質量部を用いることが好ましい。
無機系膨張材の添加量が１重量部よりも少ないと、その効果が不充分である場合があり、また３０重量部より多いと水和反応による膨張量が増加して目的の強度を得られなくなる場合があるので好ましくない。
Examples of the inorganic expansion material include Auin as the calcium sulfoaluminate system, and quick lime, quick lime-gypsum system, calcined dolomite, and the like as the lime system, and at least one selected from these can be used. As the lime-based expansion material, quick lime and quick lime-gypsum are preferable, and quick lime-gypsum is particularly preferable.
As the inorganic expansion material, for example, a material containing free quick lime as an expansion component or a commercial product having an ettringite-forming substance such as calcium sulfoaluminate as an expansion component can be used. Preferably, an expansion material containing, as an active ingredient, quick lime having an effect of enhancing strength under a low temperature environment by a hydration exotherm during reaction as well as a shrinkage compensation effect, in this case the quick lime content in the expansion material is not particularly limited, In the case where the quicklime content is high (including 100% by weight), the hydration reaction may proceed abruptly, so the content is preferably 80% by weight or less.
The addition amount of the inorganic expansion material is preferably 1 to 30 parts by mass, more preferably 2 to 25 parts by mass, more preferably 3 to 20 parts by mass, and particularly 4 to 15 parts by mass with respect to 100 parts by mass of Portland cement. Is preferably used.
If the addition amount of the inorganic expansion material is less than 1 part by weight, the effect may be insufficient. If the addition amount is more than 30 parts by weight, the expansion amount due to the hydration reaction increases and the desired strength can be obtained. Since it may disappear, it is not preferable.
金属系膨張材としては、アルミニウム粉、鉄粉等を用いることができる。特に、反応性が高いことから、アルミニウム粉の使用が好ましい。アルミニウム粉は、ＪＩＳ・Ｋ−５９０６「塗装用アルミニウム粉」の第２種に準ずるものが好適に使用できる。
金属系膨張材の添加量は、ポルトランドセメント１００質量部に対して、好ましくは０．０００１〜０．０１質量部、さらに好ましくは０．０００２〜０．００５質量部、より好ましくは０．０００３〜０．００４質量部、特に０．０００５〜０．００３質量部の範囲で用いることが好ましい。
As the metal-based expansion material, aluminum powder, iron powder, or the like can be used. In particular, the use of aluminum powder is preferred because of its high reactivity. As the aluminum powder, those conforming to the second type of JIS K-5906 “Aluminum powder for coating” can be preferably used.
The amount of the metal-based expansion material added is preferably 0.0001 to 0.01 parts by mass, more preferably 0.0002 to 0.005 parts by mass, and more preferably 0.0003 to 100 parts by mass of Portland cement. It is preferable to use in the range of 0.004 parts by mass, particularly 0.0005 to 0.003 parts by mass.
本発明に係る凝結調整剤は、低温環境下におけるポルトランドセメントの水和反応を好適に促進させるために用いるものであり、ギ酸塩と硫酸アルミニウムとをそれぞれ単独で、あるいは併せて使用することができる。 The setting modifier according to the present invention is used for suitably accelerating the hydration reaction of Portland cement in a low temperature environment, and formate and aluminum sulfate can be used alone or in combination. .
本発明で用いるギ酸塩としては、ナトリウム塩、カリウム塩、カルシウム塩、マグネシウム塩、バリウム塩、アルミニウム塩、亜鉛塩、及びアンモニウム塩等が挙げられ、これらの塩からなる群のうちの一種又は二種以上である。凝結促進効果、グラウトモルタルの流動性及び硬化体強度特性から、ギ酸塩としては、そのナトリウム塩、カルシウム塩、マグネシウム塩が好ましく、特にカルシウム塩が好ましい。
ギ酸塩の使用量は、ポルトランドセメント１００質量部に対して、好ましくは０．３〜５質量部、さらに好ましくは０．４〜４．５質量部、より好ましくは０．５〜４質量部、特に好ましくは０．６〜３質量部の範囲で好適な効果が得られる。
ギ酸塩の使用量が０．３質量部未満では初期の強度発現性が不充分な場合があり、５質量部を越えて使用しても更なる添加効果の増進が期待できない。
Examples of the formate used in the present invention include sodium salt, potassium salt, calcium salt, magnesium salt, barium salt, aluminum salt, zinc salt, and ammonium salt, and one or two of the group consisting of these salts. More than a seed. As the formate, sodium salt, calcium salt and magnesium salt are preferable, and calcium salt is particularly preferable from the viewpoint of the setting acceleration effect, the flowability of grout mortar and the strength of the cured product.
The amount of formate used is preferably 0.3-5 parts by mass, more preferably 0.4-4.5 parts by mass, more preferably 0.5-4 parts by mass, with respect to 100 parts by mass of Portland cement. Particularly preferable effects are obtained in the range of 0.6 to 3 parts by mass.
If the amount of formate used is less than 0.3 parts by mass, the initial strength development may be insufficient, and even if the amount exceeds 5 parts by mass, further enhancement of the addition effect cannot be expected.
本発明で用いる硫酸アルミニウムは、特性を妨げない範囲で粒径を適時選択することができる。
硫酸アルミニウムの使用量は、ポルトランドセメント１００質量部に対して、好ましくは０．３〜５質量部、さらに好ましくは０．４〜４．５質量部、より好ましくは０．５〜４質量部、特に好ましくは０．６〜３質量部の範囲が好適である。
硫酸アルミニウムの使用量が０．３質量部未満では初期の強度発現性が不充分な場合があり、５質量部を越えて使用しても添加量の増加に見合った効果は期待できない。
The particle diameter of the aluminum sulfate used in the present invention can be appropriately selected within a range that does not hinder the characteristics.
The amount of aluminum sulfate used is preferably 0.3-5 parts by mass, more preferably 0.4-4.5 parts by mass, more preferably 0.5-4 parts by mass, relative to 100 parts by mass of Portland cement. The range of 0.6-3 parts by mass is particularly preferable.
If the amount of aluminum sulfate used is less than 0.3 parts by mass, the initial strength development may be insufficient, and even if the amount exceeds 5 parts by mass, an effect commensurate with the increase in the amount added cannot be expected.
本発明に係る凝結調整剤は、ギ酸塩と硫酸アルミニウムとを併せて用いることがより好ましく、低温環境下におけるポルトランドセメントの水和反応をより好適に促進させる効果がある。
ギ酸塩と硫酸アルミニウムの使用量は、ポルトランドセメント１００質量部に対して、ギ酸塩と硫酸アルミニウムの合計量が、好ましくは０．３〜５質量部、さらに好ましくは０．４〜４．５質量部、より好ましくは０．５〜４質量部、特に好ましくは０．６〜３質量部の範囲が好適である。
ギ酸塩と硫酸アルミニウムの合計量が、０．３質量部未満では初期の強度発現性が不充分な場合があり、５質量部を越えて使用しても添加量の増加に見合った効果は期待できない。
The setting modifier according to the present invention is more preferably used in combination with formate and aluminum sulfate, and has the effect of more suitably promoting the hydration reaction of Portland cement in a low temperature environment.
The total amount of formate and aluminum sulfate is preferably 0.3 to 5 parts by mass, more preferably 0.4 to 4.5 parts by mass with respect to 100 parts by mass of Portland cement. Parts, more preferably 0.5 to 4 parts by weight, particularly preferably 0.6 to 3 parts by weight.
If the total amount of formate and aluminum sulfate is less than 0.3 parts by mass, the initial strength development may be insufficient, and even if the amount exceeds 5 parts by mass, an effect commensurate with the increase in the amount added is expected. Can not.
本発明の水硬性組成物は、材料分離を抑制しつつ適度な流動性を確保し、硬化体の強度を高め、且つ、乾燥収縮を低減させるために、減水効果を合わせ持つ流動化剤を添加することが好ましい。
流動化剤としては、減水効果を合わせ持つ、メラミンスルホン酸のホルムアルデヒド縮合物、カゼイン、カゼインカルシウム、ポリエーテル系、ポリカルボン酸系、ポリカルボン酸ポリエーテル系等、市販のものをその種類を問わず使用できる。
流動化剤は、本発明の水硬性組成物の特性を損なわない範囲で、一種又は二種以上を適宜添加することができ、ポルトランドセメントと膨張材とを含む水硬性成分１００質量部に対し、好ましくは０．００１〜５質量部、さらに好ましくは０．００５〜４質量部、より好ましくは０．０１〜３．５質量部、特に好ましくは０．０５〜３質量部の範囲で使用する。
The hydraulic composition of the present invention is added with a fluidizing agent that has a water reducing effect in order to ensure appropriate fluidity while suppressing material separation, increase the strength of the cured product, and reduce drying shrinkage. It is preferable to do.
As the fluidizing agent, any commercially available product such as formaldehyde condensate of melamine sulfonic acid, casein, calcium caseinate, polyether, polycarboxylic acid, and polycarboxylic acid polyether, which has a water reducing effect, can be used. Can be used without
As long as the fluidizing agent does not impair the characteristics of the hydraulic composition of the present invention, one or two or more kinds can be added as appropriate, and 100 parts by mass of the hydraulic component containing Portland cement and an expansion material, It is preferably used in the range of 0.001 to 5 parts by mass, more preferably 0.005 to 4 parts by mass, more preferably 0.01 to 3.5 parts by mass, and particularly preferably 0.05 to 3 parts by mass.
本発明の水硬性組成物では上記の成分の他に、本発明の特性を損なわない範囲で必要に応じて、増粘剤、消泡材、減水剤、高性能減水剤、有機系短繊維などの成分を少なくとも１種配合することができる。 In the hydraulic composition of the present invention, in addition to the above-described components, a thickener, an antifoaming material, a water reducing agent, a high performance water reducing agent, an organic short fiber, etc., as long as the properties of the present invention are not impaired. At least one of these components can be blended.
本発明の水硬性組成物は、水の添加量を調整することにより、グラウトモルタルの流動性、可使時間、材料分離などの性状を調整することができる。
本発明の水硬性組成物は、水と混練して
１）Ｊロート流下値が、充填性を損なわないために、好ましくは１５秒以下、さらに好ましくは１４秒以下、より好ましくは１３秒以下、特に好ましくは１２秒以下であり、
また、Ｊロート流下値の下限は、材料分離抵抗性を損なわないために、好ましくは４秒以上、さらに好ましくは５秒以上、特に好ましくは６秒以上であり、
２）得られたグラウトモルタルの凝結時間の始発が、好ましくは１０．５時間以内、より好ましくは１０時間以内であり、
凝結時間の終結が、好ましくは１５時間以内、より好ましくは１３．５時間以内であり、
３）得られたグラウトモルタルを硬化させることにより、
圧縮強度（材齢１日）が、好ましくは４．５Ｎ／ｍｍ２以上、さらに好ましくは５Ｎ／ｍｍ２以上の硬化体を得ることができ、
圧縮強度（材齢２８日）が、好ましくは４５Ｎ／ｍｍ２以上、さらに好ましくは５０Ｎ／ｍｍ２以上の硬化体を得ることができる。
The hydraulic composition of the present invention can adjust properties such as fluidity, pot life, and material separation of the grout mortar by adjusting the amount of water added.
The hydraulic composition of the present invention is kneaded with water so that 1) J funnel flow value does not impair the filling property, preferably 15 seconds or less, more preferably 14 seconds or less, more preferably 13 seconds or less, Particularly preferably, it is 12 seconds or less,
Moreover, in order not to impair the material separation resistance, the lower limit of the J funnel flow value is preferably 4 seconds or more, more preferably 5 seconds or more, particularly preferably 6 seconds or more,
2) The initial setting time of the obtained grout mortar is preferably within 10.5 hours, more preferably within 10 hours,
The end of the setting time is preferably within 15 hours, more preferably within 13.5 hours,
3) By curing the resulting grout mortar,
Compressive strength (age of 1 day) is preferably 4.5 N / mm 2 or more, more preferably it is possible to obtain a 5N / mm 2 or more cured body,
A cured product having a compressive strength (material age of 28 days) is preferably 45 N / mm 2 or more, and more preferably 50 N / mm 2 or more.
水の添加量は、本発明の流動特性および強度特性を損なわない範囲で添加でき、ポルトランドセメントと膨張材とを含む水硬性成分１００質量部に対し、好ましくは２５〜７０質量部、さらに好ましくは３０〜６０質量部、より好ましくは３３〜５７質量部、特に好ましくは３５〜５５質量部の範囲で添加することが好ましい。 The addition amount of water can be added within a range that does not impair the flow characteristics and strength characteristics of the present invention, and is preferably 25 to 70 parts by mass, more preferably 100 parts by mass with respect to 100 parts by mass of the hydraulic component containing Portland cement and an expansion material. It is preferable to add in the range of 30 to 60 parts by mass, more preferably 33 to 57 parts by mass, particularly preferably 35 to 55 parts by mass.
本発明の水硬性組成物は、低温環境下、すなわち気温が好ましくは２℃〜１５℃、さらに好ましくは２℃〜１３℃、より好ましくは２℃〜１２℃、特に好ましくは、２℃〜１０℃の範囲で好適な性能が発揮される。 The hydraulic composition of the present invention has a low temperature environment, that is, the temperature is preferably 2 ° C to 15 ° C, more preferably 2 ° C to 13 ° C, more preferably 2 ° C to 12 ° C, and particularly preferably 2 ° C to 10 ° C. Suitable performance is exhibited in the range of ° C.
本発明の水硬性組成物は、低温環境下において、流動性に優れたグラウトモルタルと強度発現性及び無収縮性に優れたグラウト硬化体を得ることができ、低温環境下で行われる土木建築分野の各種工事で、好適に利用されるグラウト材を提供するものである。 The hydraulic composition of the present invention can obtain a grout mortar excellent in fluidity and a grout cured product excellent in strength development and non-shrinkage in a low-temperature environment, and in the civil engineering and construction field performed in a low-temperature environment. It is intended to provide a grout material that is suitably used in various constructions.
以下、本発明を実施例に基づいてさらに詳細に説明する。但し、本発明は下記実施例により制限されるものでない。 Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited by the following examples.
（特性の評価方法）
１）Ｊロート流下値（秒）：土木学会充てんモルタル試験方法（案）（ＪＳＣＥ・Ｆ５４２−１９９３） Ｊ１４ロートによる流下値を示す。
２）凝結時間：日本道路公団ＪＨＳ−３１２−１９９２に準じてプロクター貫入抵抗針により試験を行う。
３）圧縮強度（Ｎ／ｍｍ２）：試験体φ５×１０ｃｍ、ＪＩＳ・Ａ−１１０８に準じて行う。
４）膨張率（％）：試験体φ５×１０ｃｍ、日本道路公団ＪＨＳ−３１２−１９９２に準じてマイクロメーター法により行う。（但し、膨張率は、膨張を＋、収縮を−で示す。）
(Characteristic evaluation method)
1) J funnel flow down value (seconds): JSCE filling mortar test method (draft) (JSCE F542-1993) Shows the flow down value by J 14 funnel.
2) Setting time: The test is conducted with a Procter penetration resistance needle according to Japan Highway Public Corporation JHS-312-1992.
3) Compressive strength (N / mm 2 ): Specimen φ5 × 10 cm, according to JIS A-1108.
4) Expansion rate (%): Specimen φ5 × 10 cm, measured by the micrometer method according to Japan Highway Public Corporation JHS-312-1992. (However, the expansion rate is indicated by + for expansion and-for contraction.)
原料は以下のものを使用した。
１）水硬性成分：
・ポルトランドセメント（宇部早強ポルトランドセメント、ブレーン比表面積４５００ｃｍ２／ｇ）。
２）細骨材：
・珪砂ａ ： Ｓ４（川鉄鉱業社製）。
・珪砂ｂ ： ＳＮ５０（瓢屋社製）。
・珪砂ｃ ： ＳＮ７０（瓢屋社製）。
・細骨材には、表１に示す粒度構成の珪砂ａと珪砂ｂと珪砂ｃとを、珪砂ａ：４５質量部、珪砂ｂ：５５質量部、珪砂ｃ：５０質量部の割合で混合して使用した。
珪砂ａ、珪砂ｂ、珪砂ｃの粒度について、篩を用いて測定した結果を表３に示す。
３）無機系膨張材 ： 生石灰−石膏系膨張材（太平洋マテリアル社製）。
４）金属系膨張材 ： アルミニウム粉（粒度４４μｍ以下を６０質量％以上含有、大和金属粉工業社製、ＡＬＣファイン及びＫ−２５０の混合品）。
５）石膏 ： ＩＩ型無水石膏（セントラル硝子社製）。
６）凝結調整剤：
・ギ酸カルシウム（和光純薬工業社製）。
・ギ酸マグネシウム（三津和化学薬品社製）。
・ギ酸ナトリウム（和光純薬工業社製）。
・硫酸アルミニウム（大明化学工業社製）。
７）流動化剤 ： ポリカルボン酸系流動化剤（竹本油脂社製、チューポールＳＤ−１００）。
The following materials were used.
1) Hydraulic component:
Portland cement (Ube Hayashi Portland cement, Blaine specific surface area 4500 cm 2 / g).
2) Fine aggregate:
-Silica sand a: S4 (made by Kawatetsu Mining Co., Ltd.).
-Silica sand b: SN50 (made by Ashiya company).
-Silica sand c: SN70 (made by Ashiya company).
In the fine aggregate, silica sand a, silica sand b, and silica sand c having the particle size composition shown in Table 1 are mixed at a ratio of silica sand a: 45 parts by mass, silica sand b: 55 parts by mass, and silica sand c: 50 parts by mass. Used.
Table 3 shows the results of measurement using a sieve for the particle sizes of silica sand a, silica sand b, and silica sand c.
3) Inorganic expansive material: Quicklime-gypsum expansive material (manufactured by Taiheiyo Materials Co., Ltd.)
4) Metal-based expanding material: Aluminum powder (containing 60% by mass or more of particle size of 44 μm or less, manufactured by Daiwa Metal Powder Co., Ltd., a mixture of ALC Fine and K-250).
5) Gypsum: Type II anhydrous gypsum (manufactured by Central Glass Co., Ltd.).
6) Setting agent:
・ Calcium formate (manufactured by Wako Pure Chemical Industries, Ltd.).
・ Magnesium formate (Mitsuwa Chemical Co., Ltd.).
-Sodium formate (manufactured by Wako Pure Chemical Industries).
-Aluminum sulfate (manufactured by Daimei Chemical Industry Co., Ltd.).
7) Fluidizer: Polycarboxylic acid fluidizer (Takemoto Yushi Co., Ltd. Tupole SD-100).
［実施例１〜９及び比較例１〜５］
表１及び表２に示す成分を、アイリッヒミキサを使用して混合し、表１及び表２に示すポルトランドセメント、細骨材、膨張材及び凝結調整剤を含む水硬性組成物を得た。
[Examples 1 to 9 and Comparative Examples 1 to 5]
The components shown in Table 1 and Table 2 were mixed using an Eirich mixer to obtain a hydraulic composition containing Portland cement, fine aggregate, expansion material and setting modifier shown in Table 1 and Table 2.
低温環境を想定して、温度５℃、相対湿度６５％の条件下で、２Ｌポリ容器に水硬性組成物５００質量部に対して水２３５質量部を加え、タービン羽根を取り付けた０．１５ＫＷ攪拌機（新東科学社製、品番：スリーワンモータＢＬ６００）を使用し、３００ｒｐｍで攪拌しながら水硬性組成物を全量投入後、７８０ｒｐｍで２分間混練して、グラウトモルタルを調製した。 Assuming a low temperature environment, a 0.15 kW stirrer in which 235 parts by mass of water is added to 500 parts by mass of the hydraulic composition in a 2 L plastic container under conditions of a temperature of 5 ° C. and a relative humidity of 65%, and a turbine blade is attached. (Shinto Kagaku Co., Ltd., product number: Three-One Motor BL600) was used, and the entire amount of the hydraulic composition was added while stirring at 300 rpm, and then kneaded at 780 rpm for 2 minutes to prepare grout mortar.
実施例３、実施例８及び比較例１については、温度２０℃、相対湿度６５％の条件下で同様にして、グラウトモルタルを調製した。 For Example 3, Example 8, and Comparative Example 1, grout mortar was prepared in the same manner under the conditions of a temperature of 20 ° C. and a relative humidity of 65%.
得られたグラウトモルタルのＪロート及びフロー値、混練物の硬化体の圧縮強度を評価した結果を表１及び表２に示す。 Tables 1 and 2 show the results of evaluating the J funnel and flow value of the obtained grout mortar and the compression strength of the cured product of the kneaded product.
５℃の低温環境下での評価結果は以下のとおりである。
１）凝結調整剤にギ酸塩を用いた実施例１〜５の場合、凝結調整剤を用いない比較例１と対比して、グラウトモルタルの流動性はほぼ同等であり、凝結時間は短縮されている。さらに、材齢１日時点の圧縮強度を比較すると、比較例１では１．３Ｎ／ｍｍ２なのに対して、実施例１〜５で５Ｎ／ｍｍ２以上の圧縮強度が得られている。
また、実施例１〜５のグラウト硬化体は、比較例１の硬化体とほぼ同等の膨張率を示している。
２）凝結調整剤にギ酸塩を用い、石灰−石膏系膨張材に替えて無水石膏を用いた比較例２は、グラウト硬化体の膨張率がマイナスであり（収縮しており）、グラウト材の基本要件を備えていない。
３）凝結調整剤にギ酸塩を用い、金属系膨張剤を用いない比較例３についても、グラウト硬化体の膨張率がマイナスであり、グラウト材の特性の基本要件を備えていない。
The evaluation results in a low temperature environment of 5 ° C. are as follows.
1) In the case of Examples 1 to 5 in which formate is used as a setting modifier, the flowability of grout mortar is almost the same as that of Comparative Example 1 in which no setting modifier is used, and the setting time is shortened. Yes. Furthermore, when the compressive strength at the age of 1 day is compared, it is 1.3 N / mm 2 in Comparative Example 1, whereas a compressive strength of 5 N / mm 2 or more is obtained in Examples 1-5.
Moreover, the grout hardening body of Examples 1-5 has shown the expansion coefficient substantially equivalent to the hardening body of the comparative example 1. FIG.
2) In Comparative Example 2 in which formate was used as a setting modifier and anhydrous gypsum was used in place of the lime-gypsum-based expansion material, the expansion rate of the grout cured body was negative (shrinkage), and the grout material Does not have basic requirements.
3) Also in Comparative Example 3 in which a formate is used as a setting modifier and no metal expansion agent is used, the expansion coefficient of the grout cured product is negative and the basic requirements for the characteristics of the grout material are not provided.
４）凝結調整剤に硫酸アルミニウムを用いた実施例６〜８の場合、凝結調整剤を用いない比較例１と対比して、ほぼ同等のグラウトモルタルの流動性を得られ、凝結時間はさらに短縮されている。また、材齢１日時点の圧縮強度を比較すると、比較例１では１．３Ｎ／ｍｍ２なのに対して、実施例６〜８では４．５Ｎ／ｍｍ２以上の圧縮強度が得られている。
グラウト硬化体の膨張率については、実施例８の結果が示すとおりで、良好な膨張率が得られている。
５）凝結調整剤に硫酸アルミニウムを用い、石灰−石膏系膨張材に替えて無水石膏を用いた比較例４、および、金属系膨張剤を用いず石灰−石膏系膨張材のみを用いた比較例５の場合、グラウト硬化体が収縮しておりグラウト材としては好ましくない。
4) In the case of Examples 6 to 8 where aluminum sulfate was used as a setting modifier, almost the same fluidity of grout mortar was obtained as compared with Comparative Example 1 where no setting modifier was used, and the setting time was further shortened. Has been. Moreover, when the compressive strength at the age of 1 day is compared, it is 1.3 N / mm 2 in Comparative Example 1, whereas in Examples 6 to 8, a compressive strength of 4.5 N / mm 2 or more is obtained.
About the expansion coefficient of a grout hardening body, as the result of Example 8 shows, the favorable expansion coefficient is obtained.
5) Comparative Example 4 using aluminum sulfate as a setting adjuster and using anhydrous gypsum instead of lime-gypsum expansion material, and Comparative Example using only lime-gypsum expansion material without using a metal expansion agent In the case of 5, the grout hardened body is contracted, which is not preferable as a grout material.
６）凝結調整剤にギ酸塩と硫酸アルミニウムとを併せて用いた実施例９の場合、グラウトモルタルの流動性は、凝結調整剤を用いない比較例１とほぼ同等であり、凝結時間は大幅に短縮されている。さらに、材齢１日時点の圧縮強度を比較すると、比較例１では１．３Ｎ／ｍｍ２なのに対して、実施例９では９Ｎ／ｍｍ２以上の圧縮強度が得られている。 6) In the case of Example 9 in which formate and aluminum sulfate were used in combination as the setting modifier, the flowability of the grout mortar was almost the same as in Comparative Example 1 in which no setting modifier was used, and the setting time was greatly increased. It has been shortened. Furthermore, when the compressive strength at the age of 1 day is compared, in Comparative Example 1, it is 1.3 N / mm 2 , whereas in Example 9, a compressive strength of 9 N / mm 2 or more is obtained.
２０℃の温度条件下で、比較例１、実施例３及び実施例８の水硬性組成物の可使時間を評価した結果、実施例３及び実施例８では凝結調整剤によって凝結が促進されすぎ、実用上充分な可使時間は得られていない。 As a result of evaluating the pot life of the hydraulic compositions of Comparative Example 1, Example 3 and Example 8 under the temperature condition of 20 ° C., in Example 3 and Example 8, setting was promoted too much by the setting modifier. However, practically sufficient pot life has not been obtained.
本発明のグラウト材は、低温環境下において、流動性、強度発現性及び寸法安定性に優れた水硬性組成物であり、例えば気温５℃といった低温環境下において、土木工事或いは建築工事に用いられる充填材やグラウト材としての要求性能を兼ね備えていて好適に用いることが出来る。 The grout material of the present invention is a hydraulic composition excellent in fluidity, strength development and dimensional stability in a low temperature environment, and is used for civil engineering or construction work in a low temperature environment such as a temperature of 5 ° C. It also has the required performance as a filler or grout material and can be suitably used.
Claims (6)
凝結調整剤が、ギ酸塩及び硫酸アルミニウムより選ばれる成分を少なくとも１種含む
ことを特徴とする水硬性組成物。 A hydraulic composition containing Portland cement, a setting modifier, an inorganic expansion material, a metal expansion material and a fine aggregate,
A hydraulic composition, wherein the setting modifier includes at least one component selected from formate and aluminum sulfate.
ことを特徴とする請求項１に記載の水硬性組成物。 The hydraulic composition according to claim 1, wherein the setting modifier is 0.3 to 5 parts by mass with respect to 100 parts by mass of Portland cement.
ことを特徴とする請求項１又は請求項２のいずれか１項に記載の水硬性組成物。 The hydraulic composition according to any one of claims 1 and 2, wherein the formate is at least one selected from calcium formate, magnesium formate, and sodium formate.
ことを特徴とする請求項１〜３のいずれか１項に記載の水硬性組成物。 The hydraulic composition according to any one of claims 1 to 3, wherein the hydraulic composition further contains a polycarboxylic acid-based fluidizing agent.
５℃で養生した材齢１日のグラウトモルタル硬化体の圧縮強度が、４．５Ｎ／ｍｍ２以上であることを特徴とするグラウトモルタル。 A grout mortar obtained by kneading the hydraulic composition according to any one of claims 1 to 4 and water,
A grout mortar characterized in that the compressive strength of a 1 day old grout mortar cured at 5 ° C. is 4.5 N / mm 2 or more.
A grout mortar cured body obtained by curing the blend of the hydraulic composition according to any one of claims 1 to 4 and water.
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| JP2011195402A (en) * | 2010-03-23 | 2011-10-06 | Ube Industries Ltd | Hydraulic composition |
| JP2011195403A (en) * | 2010-03-23 | 2011-10-06 | Ube Industries Ltd | Hydraulic composition, grout mortar, and hardened body of the same |
| JP2012201532A (en) * | 2011-03-24 | 2012-10-22 | Ube Industries Ltd | High fluidity mortar composition |
| JP2012201533A (en) * | 2011-03-24 | 2012-10-22 | Ube Industries Ltd | Construction method of structure for residential foundation and structure for residential foundation constructed by using the same |
| JP2016088804A (en) * | 2014-11-05 | 2016-05-23 | 太平洋セメント株式会社 | Manufacturing method of concrete |
| JP2017149599A (en) * | 2016-02-24 | 2017-08-31 | 太平洋マテリアル株式会社 | Non-shrink grout composition |
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| JP2006027937A (en) * | 2004-07-14 | 2006-02-02 | Denki Kagaku Kogyo Kk | Cement composition for grout and grouting material |
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