JP2014189424A - High-strength cement admixture, and cement composition obtained by using the same - Google Patents
High-strength cement admixture, and cement composition obtained by using the same Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 54
- 239000000203 mixture Substances 0.000 title claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 29
- 239000002893 slag Substances 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 15
- 238000010298 pulverizing process Methods 0.000 claims abstract description 13
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 abstract description 9
- 238000002474 experimental method Methods 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 238000000034 method Methods 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000010883 coal ash Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000004480 active ingredient Substances 0.000 description 3
- 239000002956 ash Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000013065 commercial product Substances 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 150000001346 alkyl aryl ethers Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- DNIAPMSPPWPWGF-UHFFFAOYSA-N monopropylene glycol Natural products CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- -1 propylene glycol monoalkyl ether Chemical class 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910021486 amorphous silicon dioxide Inorganic materials 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000007798 antifreeze agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000006072 paste Substances 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、主に、土木分野、建築分野に使用するセメントコンクリートの収縮低減型で高強度を促進するセメント混和材およびセメント組成物に関する。 The present invention mainly relates to a cement admixture and a cement composition that promote high strength by reducing the shrinkage of cement concrete used in the civil engineering and construction fields.
従来、セメントコンクリートの収縮低減型で高強度を促進させる方法としては、収縮低減剤をコンクリートに添加し、水／セメント比をできる限り小さくする必要があるため、ＪＩＳ Ａ ６２０４「コンクリート用化学混和剤」で規定されている、減水剤や高性能減水剤を使用することが一般的に行われている。 Conventionally, as a method for promoting high strength with a shrinkage reduction type of cement concrete, it is necessary to add a shrinkage reducing agent to the concrete and make the water / cement ratio as small as possible. Therefore, JIS A 6204 “Chemical admixture for concrete” In general, the use of a water reducing agent or a high performance water reducing agent as defined in "."
一方、水／セメント比の低減によらず、例えば、活性シリカ質物質を含有してなる混和材、と潜在水硬性物質とを有効成分とする混和材を使用してセメントコンクリートの圧縮強度を高める方法が提案されている（特許文献１、２参照）。
しかしながら、水／セメント比（以下Ｗ／Ｃという）が２５（％）以下のコンクリート配合や微粉末の高強度混和材を添加するコンクリート配合においては自己収縮が課題となっていた。
そのため、改善策として収縮低減剤をセメントに対して１〜４（％）添加していたが、収縮低減剤を多く入れることによりコストが上がり、若材齢（１〜７日）では強度低下が見られ、型枠の脱型時期が遅くなる課題があった（特許文献３参照）。
On the other hand, regardless of the reduction of the water / cement ratio, for example, an admixture containing an active siliceous substance and an admixture containing a latent hydraulic substance as active ingredients are used to increase the compressive strength of cement concrete. A method has been proposed (see Patent Documents 1 and 2).
However, self-shrinkage has been a problem in concrete blends in which the water / cement ratio (hereinafter referred to as W / C) is 25% or less, or in concrete blends in which a fine powder high-strength admixture is added.
For this reason, 1 to 4 (%) of a shrinkage reducing agent was added to the cement as an improvement measure, but the cost increased by adding a large amount of the shrinkage reducing agent, and the strength decreased at the young age (1 to 7 days). As a result, there was a problem that the mold removal time was delayed (see Patent Document 3).
本発明は、コンクリートの収縮低減剤の使用量を低減し、自己収縮を低減させる高強度セメント混和材およびそれを用いたセメント組成物を提供する。 The present invention provides a high-strength cement admixture that reduces the amount of shrinkage-reducing agent used in concrete and reduces self-shrinkage, and a cement composition using the same.
すなわち、本発明は、（１）シリカフュームと収縮低減剤を混合粉砕してなる高強度セメント混和材、（２）さらに、フライアッシュを配合し混合粉砕してなる（１）の高強度セメント混和材、（３）さらに、高炉スラグを配合し混合粉砕してなる（１）または（２）の高強度セメント混和材、（４）混合粉砕後の最大粒径が０．０８μｍ以下である（１）の収縮低減型高強度セメント混和材、（５）混合粉砕後の最大粒径が５μｍ以下である（２）または（３）の収縮低減型高強度セメント混和材、（６）セメントと、（１）〜（５）のいずれかの収縮低減型高強度セメント混和材を含有してなるセメント組成物、である。 That is, the present invention includes (1) a high-strength cement admixture obtained by mixing and pulverizing silica fume and a shrinkage reducing agent, and (2) a high-strength cement admixture obtained by further mixing and pulverizing fly ash. (3) Further, the high-strength cement admixture of (1) or (2) obtained by blending and pulverizing blast furnace slag, (4) The maximum particle size after mixing and pulverization is 0.08 μm or less (1) (5) The shrinkage-reducing high-strength cement admixture of (2) or (3), wherein the maximum particle size after mixing and grinding is 5 μm or less, (6) Cement (1) A cement composition comprising the shrinkage-reducing high-strength cement admixture according to any one of (1) to (5).
本発明は、従来と比べ、コンクリートの若材齢の強度の発現性および高強度化が図れると共に、収縮低減剤の使用量を少なくすることが可能となり、コンクリートの自己収縮を低減することができる。
ここで、本発明で云う自己収縮とは、セメントの水和により凝結始発以後に巨視的に生じる体積減少を自己収縮という。
Compared to the conventional art, the present invention can increase the strength and strength of concrete young age, reduce the amount of shrinkage reducing agent used, and reduce the self-shrinkage of concrete. .
Here, the self-shrinkage referred to in the present invention refers to a volume reduction that occurs macroscopically after the initial setting due to cement hydration.
本発明で使用する部、％は、特に規定しない限り質量基準である。
また、本発明で云うコンクリートとは、セメントペースト、セメントモルタル、セメントコンクリートを総称するものである。
Unless otherwise specified, parts and% used in the present invention are based on mass.
The concrete referred to in the present invention is a generic term for cement paste, cement mortar, and cement concrete.
本発明のシリカフューム（以下、ＳＦという）とは、特に限定されるものではないが、例えば、金属シリコンやフェロシリコンなどのシリコンアロイを電気炉で製造する際に、アーク熱で一度気化したＳｉＯ２が煙道で冷却される過程で固化し副生する球形の、直径が１μｍ以下の微粒子で、主成分は非晶質の反応性の高いＳｉＯ２である。 The silica fume (hereinafter referred to as SF) of the present invention is not particularly limited. For example, when a silicon alloy such as metal silicon or ferrosilicon is produced in an electric furnace, SiO 2 once vaporized by arc heat is used. Is a spherical fine particle having a diameter of 1 μm or less, which is solidified as a by-product in the process of being cooled in the flue, and the main component is amorphous SiO 2 having high reactivity.
本発明の収縮低減剤とは、（ポリ）エチレングリコールモノアルキルエーテルを０．３〜４５％、（ポリ）エチレン（ポリ）プロピレングリコールモノアルキルエーテルを５５〜９９．７％（合計１００％）の割合で含有するもの、または（ポリ）エチレングリコールモノアルキルエーテルを０．３〜４５％、ポリプロピレングリコールを５５〜９９．７％（合計１００％）の割合で有するもの、低分子量エチレンオキサイドとプロピレンオキサイドの共重合体で、有効成分１００％に近いものなどが挙げられる。
なかでも、低分子量エチレンオキサイドとプロピレンオキサイドの共重合体で、有効成分１００％に近いものが特に好ましい。
収縮低減剤の含有量は、本発明の収縮低減型高強度セメント混和材（以下、混和材という）１００部中、０．３〜３．０部が好ましく、０．５〜２．０部がより好ましい。０．３部未満では収縮低減効果が得られない場合があり、３部を超えると若材齢（材齢１日）の強度が低くなる場合がある。
The shrinkage reducing agent of the present invention is 0.3 to 45% (poly) ethylene glycol monoalkyl ether and 55 to 99.7% (total 100%) of (poly) ethylene (poly) propylene glycol monoalkyl ether. Containing at a ratio, or having (poly) ethylene glycol monoalkyl ether in a proportion of 0.3 to 45% and polypropylene glycol in a proportion of 55 to 99.7% (total 100%), low molecular weight ethylene oxide and propylene oxide And a copolymer close to 100% of the active ingredient.
Of these, a copolymer of low molecular weight ethylene oxide and propylene oxide that is close to 100% of the active ingredient is particularly preferable.
The content of the shrinkage reducing agent is preferably 0.3 to 3.0 parts, preferably 0.5 to 2.0 parts, in 100 parts of the shrinkage-reducing high-strength cement admixture (hereinafter referred to as admixture) of the present invention. More preferred. If the amount is less than 0.3 part, the shrinkage reduction effect may not be obtained. If the amount exceeds 3 parts, the strength of the young material age (material age 1 day) may be lowered.
本発明のフライアッシュとは、例えば、火力発電所のボイラから排出される石炭燃焼灰など、手段を問わず、石炭を燃焼させて得られた燃焼灰の総称をいう。
石炭灰とは、例えば、石炭火力発電所から発生する灰であり、微粉炭燃焼によって生成する。石炭灰としては、燃焼ボイラの燃焼ガスから空気余熱器または節炭器などを通過する際に落下採取された石炭灰、電気集塵機で採取された石炭灰、燃焼ボイラの炉底に落下した石炭灰などが挙げられる。これらの中では、ＪＩＳ規格のフライアッシュが好ましい。
フライアッシュのブレーン比表面積は、２５００ｃｍ２／ｇ以上が好ましく、３０００〜４５００ｃｍ２／ｇがより好ましい。
石炭灰の密度は、１．９５ｇ／ｃｍ３以上が好ましく、２．２〜２．４ｇ／ｃｍ３がより好ましい。
フライアッシュの含有量は、ＳＦとフライアッシュの合計１００部中、５〜３０部が好ましく、１０〜２０部がより好ましい。５部未満ではコンクリートの収縮低減の改善が見られない場合があり、３０部を超えると長期材齢（材齢２８日）強度が低減する場合がある。
The fly ash of the present invention is a general term for combustion ash obtained by burning coal regardless of the means such as coal combustion ash discharged from a boiler of a thermal power plant.
Coal ash is, for example, ash generated from a coal-fired power plant, and is generated by pulverized coal combustion. As coal ash, coal ash dropped from the combustion gas of the combustion boiler when passing through an air regenerator or economizer, coal ash collected by an electric dust collector, coal ash dropped on the furnace bottom of the combustion boiler Etc. Among these, JIS standard fly ash is preferable.
The brane specific surface area of fly ash is preferably 2500 cm 2 / g or more, and more preferably 3000 to 4500 cm 2 / g.
The density of the coal ash is preferably 1.95 g / cm 3 or more, 2.2~2.4g / cm 3 is more preferable.
The content of fly ash is preferably 5 to 30 parts, more preferably 10 to 20 parts, out of a total of 100 parts of SF and fly ash. If it is less than 5 parts, improvement of shrinkage reduction of concrete may not be seen, and if it exceeds 30 parts, the long-term age (28 days of age) may be reduced.
本発明の高炉スラグとは、鉄鋼製造の過程で高炉から排出される溶融状態のスラグを水などで急冷してガラス質にした高炉水砕スラグなどであり、粉砕して粉末化したものである。
高炉水砕スラグは、潜在水硬性を有しており、アルカリの刺激作用により硬化する性質を持つものである。これ以外の、例えば、都市ゴミや下水汚泥等を溶融したスラグ、脱燐スラグ、徐冷スラグなども使用することができる。
高炉スラグのブレーン比表面積は、２５００ｃｍ２／ｇ以上が好ましく、３０００〜４５００ｃｍ２／ｇがより好ましい。
ＳＦ、高炉スラグ混合の場合の高炉スラグの含有量は、ＳＦ、および高炉スラグの合計１００部中、５〜３０部が好ましく、１０〜２０部がより好ましい。５部未満ではコンクリートの収縮低減効果の改善が見られない場合があり、３０部を超えると長期材齢（材齢２８日）強度が低減する場合がある。
例えば、混和材をベルトコンベアーで定量フィードしながら薬注ポンプなどで収縮低減剤を混和材の上に定量的に滴下し、そのままミルにフィードする方法が煩雑でなく最も好ましい。粉砕条件は５μｍ以下に粉砕する。
ＳＦ、フライアッシュ、高炉スラグ混合の場合の高炉スラグの含有量は、ＳＦ、フライアッシュおよび高炉スラグの合計１００部中、５〜３０部が好ましく、１０〜２０部がより好ましい。５部未満ではコンクリートの収縮低減効果の改善が見られない場合があり、３０部を超えると長期材齢（材齢２８日）強度が低減する場合がある。
例えば、混和材をベルトコンベアーで定量フィードしながら薬注ポンプなどで収縮低減剤を混和材の上に定量的に滴下し、そのままミルにフィードする方法が煩雑でなく最も好ましい。粉砕条件は５μｍ以下に粉砕する。
The blast furnace slag of the present invention is a ground granulated blast furnace slag, etc., which is rapidly cooled with water or the like into a glassy slag discharged from the blast furnace during the steel manufacturing process, and is pulverized into powder. .
Blast furnace granulated slag has latent hydraulic properties and has the property of being cured by the stimulating action of alkali. Other than this, for example, slag obtained by melting municipal waste, sewage sludge, etc., dephosphorization slag, slow cooling slag, and the like can also be used.
The blast furnace slag has a brane specific surface area of preferably 2500 cm 2 / g or more, more preferably 3000 to 4500 cm 2 / g.
In the case of SF and blast furnace slag mixing, the content of blast furnace slag is preferably 5 to 30 parts, more preferably 10 to 20 parts, out of a total of 100 parts of SF and blast furnace slag. If it is less than 5 parts, the improvement of the shrinkage reduction effect of concrete may not be seen, and if it exceeds 30 parts, the long-term age (28 days of age) may be reduced.
For example, a method in which a shrinkage reducing agent is quantitatively dropped onto the admixture with a chemical injection pump while feeding the admixture quantitatively with a belt conveyor, and fed to the mill as it is is not complicated and is most preferable. The pulverization condition is pulverization to 5 μm or less.
The content of blast furnace slag in the case of mixing SF, fly ash, and blast furnace slag is preferably 5 to 30 parts, more preferably 10 to 20 parts, out of a total of 100 parts of SF, fly ash and blast furnace slag. If it is less than 5 parts, the improvement of the shrinkage reduction effect of concrete may not be seen, and if it exceeds 30 parts, the long-term age (28 days of age) may be reduced.
For example, a method in which a shrinkage reducing agent is quantitatively dropped onto the admixture with a chemical injection pump while feeding the admixture quantitatively with a belt conveyor, and fed to the mill as it is is not complicated and is most preferable. The pulverization condition is pulverization to 5 μm or less.
本発明の混合粉砕とは、特に限定されるものではないが、振動ミルやボールミルなどの磨砕形式の粉砕機や剪断破壊粉砕形式の粉砕機などを使用することによって、微粒子の表面を収縮低減剤で包み込むように粉砕することが重要である。したがって、
例えば、ＳＦをベルトコンベアーで定量フィードしながら薬注ポンプなどで収縮低減剤をＳＦの上に定量的に滴下し、そのままミルにフィードする方法が煩雑でなく好ましい。
ＳＦと収縮低減剤を混合粉砕する場合は、最大粒径０．０８μｍ以下に粉砕することが好ましい。
ＳＦと収縮低減剤に、さらに、フライアッシュや高炉スラグを配合して混合粉砕する場合は、最大粒径５μｍ以下に粉砕することが好ましい。
The mixed pulverization of the present invention is not particularly limited, but the surface of the fine particles is reduced by using a grinding-type pulverizer such as a vibration mill or a ball mill or a shear breaking pulverization-type pulverizer. It is important to grind so as to wrap with the agent. Therefore,
For example, a method in which the shrinkage reducing agent is quantitatively dropped onto the SF with a chemical injection pump or the like while quantitatively feeding the SF with a belt conveyor and fed to the mill as it is is not complicated.
When mixing and grinding SF and a shrinkage reducing agent, it is preferable to grind to a maximum particle size of 0.08 μm or less.
When blending and grinding fly ash and blast furnace slag in addition to SF and shrinkage reducing agent, it is preferable to grind to a maximum particle size of 5 μm or less.
本発明の混和材の使用量は、コンクリートの配合によって変化するため特に限定されるものではないが、通常、セメントと混和材からなるセメント組成物１００部中、５〜２０部が好ましく、１０〜２０部がより好ましい。５部未満ではコンクリートの収縮低減効果の改善が見られない場合があり、３０部を超えると長期材齢（材齢２８日）強度が低減する場合がある。 The amount of the admixture of the present invention is not particularly limited because it varies depending on the blending of concrete, but usually 5 to 20 parts are preferable in 100 parts of a cement composition composed of cement and admixture. 20 parts is more preferred. If it is less than 5 parts, the improvement of the shrinkage reduction effect of concrete may not be seen, and if it exceeds 30 parts, the long-term age (28 days of age) may be reduced.
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、および中庸熱などの各種ポルトランドセメント、これらセメントに高炉スラグ、フライアッシュ、シリカを混合した各種混合セメント、ならびに石灰石粉末を混合したフィラーセメントなどが挙げられる。 As the cement used in the present invention, various portland cements such as normal, early strength, very early strength, low heat, and moderate heat, various mixed cements obtained by mixing blast furnace slag, fly ash and silica with these cements, and limestone powder are used. Examples include mixed filler cement.
本発明では、砂、砂利の他、減水剤、高性能減水剤、ＡＥ減水剤、高性能ＡＥ減水剤、流動化剤、消泡剤、増粘剤、防錆剤、防凍剤、鋼繊維、有機系材料などを併用することが可能である。有機系材料としては、ビニロン繊維、アクリル繊維、炭素繊維などの繊維状物質などが挙げられる。 In the present invention, in addition to sand, gravel, water reducing agent, high performance water reducing agent, AE water reducing agent, high performance AE water reducing agent, fluidizing agent, antifoaming agent, thickener, rust preventive agent, antifreeze agent, steel fiber, Organic materials can be used in combination. Examples of the organic material include fibrous substances such as vinylon fiber, acrylic fiber, and carbon fiber.
「実験例１」
表１に示すように、ＳＦと収縮低減剤を配合した原料を振動ミルで最大粒径０．０８μｍ以下（実験No.1-1〜No.1-10）と０．１０μｍ以下（実験Ｎo.1-12）に粉砕し、ボールミルで最大粒径０．０８μｍ以下（実験No.1-11）に粉砕し混和材とした。
最大粒径の測定は、レーザー回折式粒度分布測定装置（堀場製作所製ＬＡ-９２０）を使用した。
コンクリート配合は、単位水量１４８ｋｇ／ｍ３、単位セメント量７００ｋｇ／ｍ３、単位混和材量７０ｋｇ／ｍ３、減水剤９．２４ｋｇ／ｍ３、ｓ／ａ４５．０％、空気量２%をコンクリートの基本配合とし、２０℃環境下で表１に示すように収縮量を測定した。
"Experiment 1"
As shown in Table 1, the maximum particle size of 0.08 μm or less (Experiment No. 1-1 to No. 1-10) and 0.10 μm or less (Experiment No. 1-12) and pulverized with a ball mill to a maximum particle size of 0.08 μm or less (Experiment No. 1-11) to obtain an admixture.
The maximum particle size was measured using a laser diffraction particle size distribution analyzer (LA-920 manufactured by Horiba, Ltd.).
Concrete mix is unit water quantity 148kg / m 3 , unit cement quantity 700kg / m 3 , unit admixture quantity 70kg / m 3 , water reducing agent 9.24kg / m 3 , s / a 45.0%, air quantity 2% to concrete The amount of shrinkage was measured as shown in Table 1 under an environment of 20 ° C.
（使用材料）
ＳＦ：非晶質シリカ、ＳｉＯ２含有率９８％、直径が１μｍ以下、市販品
収縮低減剤：低分子量エチレンオキサイドとプロピレンオキサイドの共重合体、電気化学工業社製、商品名 エスケーガード
減水剤：ポリカルボン酸系「スーパー３００ＣＦ」、グレースケミカルズ社製
細骨材：新潟県糸魚川市姫川水系産、最大寸法５ｍｍ
粗骨材：新潟県糸魚川市姫川水系産、最大寸法２５ｍｍ
(Materials used)
SF: amorphous silica, SiO 2 content 98%, diameter is 1 μm or less, commercially available shrinkage reducing agent: low molecular weight ethylene oxide and propylene oxide copolymer, manufactured by Denki Kagaku Kogyo Co., Ltd., trade name SKGARD water reducing agent: Polycarboxylic acid type "Super 300CF", fine aggregate manufactured by Grace Chemicals: Himekawa Water System, Itoigawa City, Niigata Prefecture, maximum size 5mm
Coarse aggregate: Niigata prefecture Itoigawa city Himekawa water system, maximum size 25mm
（試験方法）
圧縮強度：ＪＩＳ Ａ １１０８に準拠
自己収縮量：埋込型ひずみ計（ＫＭ−１００ＢＴ、東京測器研究所社製）を設置した１０×１０×４０ｃｍの鋼製型枠内にコンクリートを打設し、フッ素樹脂シートで包み込み乾燥しないように養生したコンクリートをデータロガーによりひずみを計測する。なお、凝結終結後、型枠の拘束（ネジ）を緩めた後に測定された実ひずみを自己収縮量とした。
(Test method)
Compressive strength: Conforms to JIS A 1108 Self-shrinkage: Concrete is placed in a 10 × 10 × 40 cm steel mold with an embedded strain gauge (KM-100BT, manufactured by Tokyo Sokki Kenkyujo Co., Ltd.) Strain is measured with a data logger for concrete that has been wrapped in a fluororesin sheet and cured to prevent drying. In addition, the actual strain measured after loosening the restraint (screw) of the mold after completion of the setting was defined as the amount of self-shrinkage.
「実験例２」
表２に示すように、ＳＦと収縮低減剤に、さらに、フライアッシュを配合した原料を振動ミルで最大粒径５μｍ以下（実験No.2-1〜No.2-7）と最大粒径６μｍ以下（実験No.2-8）に粉砕し、ボールミルで５μｍ以下（実験No.2-9）に粉砕した混和材とした以外は実験例１の実験No.1-5と同様に行った。
"Experimental example 2"
As shown in Table 2, the maximum particle size is 5 μm or less (Experiment No.2-1 to No.2-7) and the maximum particle size is 6 μm using a vibration mill in which SF and shrinkage reducing agents are further blended with fly ash. The same procedure as in Experiment No. 1-5 in Experimental Example 1 was conducted except that the admixture was pulverized to the following (Experiment No. 2-8) and pulverized to 5 μm or less (Experiment No. 2-9) with a ball mill.
（使用材料）
フライアッシュ：ＪＩＳ Ａ ６２０１−２００８ ＩＩ種、ブレーン比表面積４１３０ｃｍ２／ｇ、市販品
(Materials used)
Fly ash: JIS A 6201-2008 Type II, Blaine specific surface area 4130 cm 2 / g, commercial product
「実験例３」
表３に示すように、ＳＦ、収縮低減剤と高炉スラグを配合した原料を振動ミルで最大粒径５μｍ以下（実験No.3-1〜No.3-7）と最大粒径６μｍ以下（実験No.3-8）に粉砕し、ボールミルで５μｍ以下（実験No.3-9）に粉砕し混和材とした以外は実験例２の実験No.2-4と同様に行った。
混和材とした。
"Experiment 3"
As shown in Table 3, the raw material blended with SF, shrinkage reducing agent and blast furnace slag was mixed with a vibration mill with a maximum particle size of 5 μm or less (Experiment No.3-1 to No.3-7) and a maximum particle size of 6 μm or less (Experiment). The test was conducted in the same manner as in Experiment No. 2-4 in Experimental Example 2, except that the mixture was pulverized to No. 3-8) and pulverized to 5 μm or less (Experiment No. 3-9) using a ball mill.
Admixture was used.
（使用材料）
高炉スラグ：高炉水砕スラグ、ブレーン比表面積４０５０ｃｍ２／ｇ、市販品
(Materials used)
Blast furnace slag: granulated blast furnace slag, specific surface area of 4050 cm 2 / g, commercial product
「実験例４」
表４に示すように、ＳＦ、収縮低減剤、フライアッシュと高炉スラグを配合した原料を振動ミルで最大粒径５μｍ以下（実験No.4-1〜No.4-7）と最大粒径６μｍ以下（実験No.4-8）に粉砕し、ボールミルで５μｍ以下（実験No.4-9）に粉砕し混和材とした以外は実験例３の実験No.3-4と同様に行った。
混和材とした。
"Experimental example 4"
As shown in Table 4, the raw material blended with SF, shrinkage reducing agent, fly ash and blast furnace slag was mixed with a vibration mill with a maximum particle size of 5 μm or less (Experiment No.4-1 to No.4-7) and a maximum particle size of 6 μm. The same procedure as in Experiment No. 3-4 of Experimental Example 3 was conducted except that the mixture was pulverized to the following (Experiment No. 4-8) and pulverized to 5 μm or less (Experiment No. 4-9) with a ball mill to obtain an admixture.
Admixture was used.
（使用材料）
高炉スラグ：高炉水砕スラグ、ブレーン比表面積４０５０ｃｍ２／ｇ、市販品
(Materials used)
Blast furnace slag: granulated blast furnace slag, specific surface area of 4050 cm 2 / g, commercial product
「実験例５」
表５に示すように、混和材の実験No.1-5、2-4、3-4、4-4を使用して使用量別の実験を実施した。試験方法は表に示す条件以外は実験例１と同様に実施した。
“Experimental Example 5”
As shown in Table 5, experiments according to the amount used were carried out using Admixture Experiment Nos. 1-5, 2-4, 3-4, and 4-4. The test method was the same as in Experimental Example 1 except for the conditions shown in the table.
本発明は、従来と比べ、コンクリートの若材齢の強度の発現性および高強度化が図れると共に、収縮低減剤の使用量を少なくすることが可能となるため、コンクリートの収縮を低減することができるなどの効果を奏するので、土木、建築分野で広範に使用できる。 The present invention can reduce the shrinkage of concrete because the strength of the young age of concrete and the strength can be increased and the amount of shrinkage reducing agent used can be reduced as compared with the prior art. It can be used in a wide range of civil engineering and construction fields.
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| JPH11157889A (en) * | 1997-11-26 | 1999-06-15 | Mitsubishi Materials Corp | Hydraulic composition for cement concrete product |
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