WO2010143629A1 - 高炉スラグ組成物を用いたコンクリート組成物 - Google Patents
高炉スラグ組成物を用いたコンクリート組成物 Download PDFInfo
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- WO2010143629A1 WO2010143629A1 PCT/JP2010/059698 JP2010059698W WO2010143629A1 WO 2010143629 A1 WO2010143629 A1 WO 2010143629A1 JP 2010059698 W JP2010059698 W JP 2010059698W WO 2010143629 A1 WO2010143629 A1 WO 2010143629A1
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- blast furnace
- furnace slag
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Classifications
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
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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
- C04B28/08—Slag 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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/143—Calcium-sulfate
- C04B22/144—Phosphogypsum
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
- C04B7/19—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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/50—Defoamers, air detrainers
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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
- C04B2111/34—Non-shrinking or non-cracking materials
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Definitions
- the present invention relates to a concrete composition using a blast furnace slag composition.
- blast furnace granulated slag produced as a by-product from an ironworks is also effectively used as a raw material for blast furnace cement in the form of blast furnace slag fine powder.
- blast furnace cement used in concrete compositions is made by mixing ordinary Portland cement with blast furnace slag fine powder. According to JIS-R5211, depending on the amount of fine blast furnace slag powder, type A (over 5% to 30%), B type (over 30% to 60%) and C type (over 60% to 70%).
- Such blast furnace cement has advantages such as low heat of hydration, large long-term strength elongation, high water tightness, high resistance to chemical erosion to sulfate, and suppression effect of alkali aggregate reaction.
- the drying shrinkage is larger than that of Portland cement, and the hardened body obtained from the concrete composition using blast furnace cement is susceptible to shrinkage cracking, and it is neutralized compared to Portland cement. There is also a disadvantage that deterioration due to is fast.
- blast furnace cement is a situation that is used is limited to a good blast furnace cement B species of performance balance, blast furnace cement B species in a ratio of 250 ⁇ 450 kg in the concrete 1 m 3
- Blast Furnace Cement B about 400 kg of carbon dioxide is emitted to produce 1 ton of Blast Furnace Cement B at the factory.
- 100 to 180 kg of carbon dioxide is exhausted except for carbon dioxide generated by the operation of construction machines and transport of materials. Therefore, in concrete construction, technology that suppresses the generation of carbon dioxide by using finer blast furnace slag powder at a higher rate, assuming that the obtained hardened body has the required strength while ensuring workability. The appearance of is required.
- the present invention relates to a concrete composition using a blast furnace slag composition that meets such requirements.
- Non-Patent Document 1 the influence of the fineness and substitution rate of the blast furnace slag fine powder used on the concrete composition has been reported (for example, see Non-Patent Document 1).
- the amount of blast furnace slag fine powder used for ordinary Portland cement increases, the initial strength decreases, neutralization becomes faster, and drying shrinkage increases, compared to using ordinary Portland cement alone. It has been reported that the negative trend becomes prominent.
- Patent Documents 1 to 9 some proposals using various admixtures in addition to such blast furnace slag fine powder have been reported (see, for example, Patent Documents 1 to 9).
- Patent Documents 1 to 9 some proposals using various admixtures in addition to such blast furnace slag fine powder have been reported (see, for example, Patent Documents 1 to 9).
- these conventional proposals in fact, increase the amount of blast furnace slag fine powder used, 1) cannot ensure good workability, 2) it is difficult to suppress the drying shrinkage of the cured product, and 3) curing. There is a problem that it causes serious problems in some respects such as
- JP-A-62-158146 Japanese Unexamined Patent Publication No. 63-2842 JP-A-1-167267 Japanese Patent Laid-Open No. 10-114555 JP 2000-143326 A JP 2003-306359 A JP 2005-281123 A JP 2007-217197 A JP 2007-297226 A
- the problem to be solved by the present invention is to suppress the discharge amount of carbon dioxide by increasing the use ratio of blast furnace slag fine powder, while 1) lowering the fluidity of the prepared concrete composition over time and the amount of air 2) Ensure that good workability is ensured by suppressing the decrease in 2)
- the drying shrinkage rate of the resulting cured body is not increased compared to the case of using blast furnace cement type B, 3)
- the resulting cured body is
- the present invention is to provide a concrete composition capable of expressing necessary strength and simultaneously exhibiting the basic performances 1) to 3) above.
- the present invention is a concrete composition comprising at least a binder, water, fine aggregate, coarse aggregate and admixture, wherein the following blast furnace slag composition is used as the binder, and water /
- the present invention relates to a concrete composition using a blast furnace slag composition, wherein the mass ratio of the blast furnace slag composition is adjusted to 30 to 60%.
- Blast furnace slag composition per 100 parts by weight of a mixture containing 80 to 95% by weight of fine blast furnace slag powder having a fineness of 3000 to 13000 cm 2 / g and 5 to 20% by weight (total 100% by weight) of gypsum, A blast furnace slag composition to which an alkali stimulant is added in an amount of 0.5 to 1.5 parts by mass or 5 to 45 parts by mass.
- a concrete composition using the blast furnace slag composition according to the present invention contains at least a binder, water, fine aggregate, coarse aggregate and admixture. It is.
- the concrete composition of the present invention uses a specific blast furnace slag composition as a binder, and the blast furnace slag composition contains 80 to 95% by mass of fine powder of blast furnace slag having a fineness of 3000 to 13000 cm 2 / g.
- an alkali stimulant added in an amount of 0.5 to 1.5 parts by mass or 5 to 45 parts by mass per 100 parts by mass of the mixture containing 5 to 20% by mass (total 100% by mass) of gypsum It is.
- the blast furnace slag fine powder has a fineness of 3000 to 13000 cm 2 / g, preferably 3000 to 8000 cm 2 / g, more preferably 3500 to 6500 cm 2 / g. use. If a powder having a fineness outside the range of 3000 to 13000 cm 2 / g is used, the fluidity of the prepared concrete composition is deteriorated, or the strength expression of the obtained cured product is lowered. In the present invention, the fineness is expressed by the specific surface area by the Blaine method.
- the gypsum examples include anhydrous gypsum, dihydrate gypsum, and hemihydrate gypsum, and anhydrous gypsum is preferable. Any anhydrous gypsum can be used as long as it contains 90% by mass or more, and natural anhydrous gypsum, by-product anhydrous gypsum, and the like can be used.
- the fineness is preferably 3000 to 8000 cm 2 / g, more preferably 3500 to 6500 cm 2 / g.
- examples of the alkali stimulating material include calcium hydroxide, quicklime, light-burned magnesia, light-burned dolomite, sodium hydroxide, sodium carbonate and the like.
- an alkali stimulating material having a property of gradually generating calcium hydroxide when contacted with water is preferable, and as an alkali stimulating material having such properties, Portland cement is used.
- Portland cement include various Portland cements such as ordinary Portland cement, early-strength Portland cement, and moderately hot Portland cement, and general-purpose ordinary Portland cement is preferable.
- known river sand, crushed sand, mountain sand, etc. can be used as the fine aggregate
- known river gravel, crushed stone, lightweight aggregate, etc. can be used as the coarse aggregate
- the mass ratio of the water / blast furnace slag composition is adjusted to 30 to 60%, preferably 35 to 55%.
- this mass ratio is larger than 60%, the resulting cured product has too much drying shrinkage, and the strength is remarkably reduced.
- the mass ratio is less than 30%, the fluidity of the prepared concrete composition and the amount of air over time decrease greatly, and the workability deteriorates.
- the mass ratio of water / blast furnace slag composition is determined by (mass of water used / mass of blast furnace slag composition used) ⁇ 100.
- examples of the admixture include those used for conventionally known concrete. This includes, for example, cement dispersants, drying shrinkage reducing agents, expansion materials and the like.
- a cement dispersant and a drying shrinkage reducing agent, a cement dispersing agent and an expanding material, and a cement dispersing agent, a drying shrinkage reducing agent, and an expanding material can be used as an admixture.
- cement dispersant examples include lignin sulfonate, gluconate, naphthalene sulfonate formalin high condensate salt, melamine sulfonate formalin high condensate salt, polycarboxylic acid water-soluble vinyl copolymer, and the like.
- lignin sulfonate lignin sulfonate
- gluconate naphthalene sulfonate formalin high condensate salt
- melamine sulfonate formalin high condensate salt examples include polycarboxylic acid water-soluble vinyl copolymer, and the like.
- a polycarboxylic acid-based water-soluble vinyl copolymer is preferable, and an appropriate polycarboxylic acid-based water-soluble vinyl copolymer such as the type, composition ratio, and molecular weight of the structural unit is more preferable. preferable.
- polycarboxylic acid-based water-soluble vinyl copolymers copolymers having units formed from methacrylic acid (salt) as constituent units (for example, JP-A-58-74552 and JP-A-1-226757). And copolymers having units formed from maleic acid (salts) as constituent units (for example, JP-A-57-118058 and JP-A-63-285140).
- a cement dispersant a water-soluble vinyl copolymer having a unit formed from methacrylic acid (salt) as a structural unit is exemplified.
- Structural unit A One or more selected from a structural unit formed from methacrylic acid and a structural unit formed from methacrylate salt.
- Structural unit B composed of 5 to 150 oxyethylene units in the molecule.
- Structural unit C one or two selected from a structural unit formed from (meth) allyl sulfonate and a structural unit formed from methyl acrylate more than
- the cement dispersant made of the polycarboxylic acid-based water-soluble vinyl copolymer described above can be synthesized by a known method.
- a copolymer having a unit formed from methacrylic acid (salt) as a constituent unit it is synthesized by a method described in, for example, JP-A Nos. 58-74552 and 1-2226757.
- a copolymer having a unit formed from maleic acid (salt) as a structural unit for example, JP-A-57-118058, JP-A-2005-132957, JP-A-2008-273766. It can be synthesized by the method described in the above.
- the amount of the cement dispersant composed of these polycarboxylic acid-based water-soluble vinyl copolymers is preferably 0.1 to 1.5 parts by mass per 100 parts by mass of the blast furnace slag composition.
- drying shrinkage reducing agent known ones can be used, and are not particularly limited, but a drying shrinkage reducing agent comprising polyalkylene glycol monoalkyl ether is preferable, and among them, one selected from diethylene glycol monobutyl ether and dipropylene glycol diethylene glycol monobutyl ether Is preferred.
- the amount of the drying shrinkage reducing agent used is preferably 0.2 to 4.0 parts by mass per 100 parts by mass of the blast furnace slag composition.
- a well-known thing can be used as an expanding material, and it divides roughly and two types, a calcium sulfo aluminate type thing and a lime type thing, are mentioned. Any of these is an inorganic admixture that expands by producing ettringite and calcium hydroxide by a hydration reaction, and a concrete expansion material that satisfies the standard of JIS-A6202 is preferred.
- the amount of the expander used is preferably 10 to 25 kg per 1 m 3 of the concrete composition.
- an air entrainment (AE) agent can be used as an auxiliary agent.
- AE agents known ones can be used and are not particularly limited, but polyoxyalkylene alkyl ether sulfates, alkylbenzene sulfonates, polyoxyethylene alkylbenzene sulfonates, rosin soaps, higher fatty acid soaps, alkyl phosphate esters.
- Known AE agents such as salts and polyoxyalkylene alkyl ether phosphates can be used.
- the antifoaming agent can be used alone or in combination with the air entraining agent.
- an antifoaming agent a known one can be used, and is not particularly limited, but an antifoaming agent such as a polyoxyalkylene glycol ether derivative, a modified polydimethylsiloxane, or a trialkyl phosphate can be used.
- the amount of air regulator used is preferably 0.001 to 0.01 parts by mass per 100 parts by mass of the blast furnace slag composition.
- the concrete composition of the present invention can be prepared by a known method.
- the blast furnace slag composition, water, fine aggregate and coarse aggregate are kneaded with a mixer, while the above cement dispersant, drying shrinkage reducing agent, expansion It is preferable to mix a material, an air amount adjusting agent and the like appropriately and dilute with water, and then knead both.
- additives such as a curing accelerator, a setting retarder, a rust preventive, a waterproofing agent, and a preservative are used in combination, as long as the effects of the present invention are not impaired. You can also
- the obtained cured product is drying shrinkage is that of 800 ⁇ 10 -6 or less.
- the concrete composition of the present invention can be applied not only as a concrete composition placed at a construction site, but also as a concrete composition for a secondary product processed in a concrete product factory.
- the present invention while suppressing the amount of carbon dioxide emission in preparing a concrete composition, the deterioration of fluidity and the amount of air over time of the prepared concrete composition is suppressed to ensure good workability. Further, there is an effect that drying shrinkage of the obtained cured product can be suppressed, and further, the strength necessary for the obtained cured product can be expressed.
- Structural units A to C indicated by monomers that form each structural unit.
- A-1 Sodium methacrylate
- A-2 Methacrylic acid
- C-1 Sodium methallyl sulfonate
- C-2 Sodium allyl sulfonate
- C-3 Methyl acrylate
- Test Category 2 (Preparation of blast furnace slag composition) A blast furnace slag composition (S-1) to (S-10) and (R) was prepared by mixing blast furnace slag fine powder, anhydrous gypsum and an alkali stimulant under the blending conditions shown in Table 2. -1) to (R-10) were obtained.
- sg-1 Blast furnace slag fine powder with a fineness of 4100 cm 2 / g sg-2: Blast furnace slag fine powder with a fineness of 5900 cm 2 / g sg-3: Blast furnace slag fine powder with a fineness of 1020 cm 2 / g gp- 1: Anhydrous gypsum with a fineness of 4150 cm 2 / g gp-2: Anhydrous gypsum with a fineness of 5800 cm 2 / g rc-1: Normal Portland cement rc-2: Early strength Portland cement
- AE agent manufactured by Takemoto Yushi Co., Ltd., trade name AE-300
- a concrete composition having a water / blast furnace slag composition mass ratio of 45% or 40% was prepared.
- Comparative Examples 1-27 A concrete composition having a water / blast furnace slag composition mass ratio of 45% was prepared by the same mixing method as in the example under the blending conditions shown in Table 4.
- Comparative Examples 28 and 29 A concrete composition having a water / blast furnace cement mass ratio of 45% or 50% using blast furnace cement type B was prepared by the same mixing method as in the examples under the blending conditions shown in Table 4.
- Carbon dioxide emissions Carbon dioxide emissions (kg) when producing 1 m 3 of concrete composition.
- Type of cement dispersant water-soluble vinyl copolymer listed in Table 1 or the following P -5 P-5:
- Tupol HP-11W maleic acid and ⁇ -allyl- ⁇ -methyl-polyoxyethylene Copolymer salt
- Amount used part by mass as solid content of cement dispersant, drying shrinkage reducing agent or expansion material per 100 parts by mass of blast furnace slag composition (Comparative Examples 28 and 29 are blast furnace cement type B)
- Type of blast furnace slag composition Items listed in Table 2 * 1: Diethylene glycol monobutyl ether * 2: Dipropylene glycol diethylene glycol monobutyl ether * 3: Trade name made by Tai
- Test category 4 Evaluation of prepared concrete composition
- the air content, slump, and slump residual rate were calculated
- the drying shrinkage rate and the compressive strength were calculated
- Air content (volume%): The concrete composition immediately after kneading and the concrete composition after standing for 60 minutes were measured according to JIS-A1128.
- Slump (cm): Measured according to JIS-A1101 simultaneously with the measurement of the air amount.
- -Slump residual rate (%): (slump after standing for 60 minutes / slump immediately after kneading) x 100.
- Drying shrinkage rate In accordance with JIS-A1129, dry shrinkage strain was measured by a comparator method on a 26-week-old specimen in which the concrete composition of each example was stored at 20 ° C. ⁇ 60% RH and dried. Shrinkage was determined. The smaller this value, the smaller the drying shrinkage.
- Compressive strength (N / mm 2 ): The concrete composition of each example was measured at a material age of 7 days and a material age of 28 days in accordance with JIS-A1108.
- the results are summarized in Tables 5 and 6.
- the concrete composition of the present invention prepared in each example has less carbon dioxide emission for producing 1 m 3 of the concrete composition than the case where the blast furnace cement type B is used, and the concrete composition is deteriorated over time.
- the resulting cured product has a drying shrinkage ratio of less than 800 ⁇ 10 ⁇ 6 and a sufficient compressive strength required.
Abstract
Description
構成単位B:分子中に5~150個のオキシエチレン単位で構成されたポリオキシエチレン基を有するメトキシポリエチレングリコールメタクリレートから形成された構成単位
構成単位C:(メタ)アリルスルホン酸塩から形成された構成単位及びメチルアクリレートから形成された構成単位から選ばれる一つ又は二つ以上
・水溶性ビニル共重合体(p-1)の合成
メタクリル酸60g、メトキシポリ(オキシエチレン単位数が23個、以下n=23とする)エチレングリコールメタクリレート300g、メタリルスルホン酸ナトリウム5g、3-メルカプトプロピオン酸4g及び水490gを反応容器に仕込んだ後、48%水酸化ナトリウム水溶液58gを加え、攪拌しながら部分中和して均一に溶解した。反応容器内の雰囲気を窒素置換した後、反応系の温度を温水浴にて60℃に保ち、過硫酸ナトリウムの20%水溶液25gを加えてラジカル重合反応を開始し、5時間反応を継続して反応を終了した。その後、48%水酸化ナトリウム水溶液23gを加えて反応物を完全中和し、メタクリル酸塩から形成された単位を構成単位にもつポリカルボン酸系の水溶性ビニル共重合体(p-1)の40%水溶液を得た。水溶性ビニル共重合体(p-1)を分析したところ、メタクリル酸ナトリウムから形成された構成単位/メトキシポリ(n=23)エチレングリコールメタクリレートから形成された構成単位/メタリルスルホン酸ナトリウムから形成された構成単位=70/27/3(モル%)の割合で有する質量平均分子量が33800の水溶性ビニル共重合体であった。
水溶性ビニル共重合体(p-1)の合成と同様にして、水溶性ビニル共重合体(p-2)~(p-4)及び(pr-1)~(pr-4)を合成した。以上で合成した各水溶性ビニル共重合体の内容を表1にまとめて示した。
構成単位A~C:各構成単位を形成することとなる単量体で表示した。
A-1:メタクリル酸ナトリウム
A-2:メタクリル酸
B-1:メトキシポリ(n=23)エチレングリコールメタクリレート
B-2:メトキシポリ(n=68)エチレングリコールメタクリレート
B-3:メトキシポリ(n=9)エチレングリコールメタクリレート
C-1:メタリルスルホン酸ナトリウム
C-2:アリルスルホン酸ナトリウム
C-3:メチルアクリレート
表2に記載の調合条件で、高炉スラグ微粉末、無水石膏及びアルカリ刺激材を混合して高炉スラグ組成物を調製し、高炉スラグ組成物(S-1)~(S-10)及び(R-1)~(R-10)を得た。
sg-1:粉末度が4100cm2/gの高炉スラグ微粉末
sg-2:粉末度が5900cm2/gの高炉スラグ微粉末
sg-3:粉末度が1020cm2/gの高炉スラグ微粉末
gp-1:粉末度が4150cm2/gの無水石膏
gp-2:粉末度が5800cm2/gの無水石膏
rc-1:普通ポルトランドセメント
rc-2:早強ポルトランドセメント
実施例1~36
表3に記載の配合条件で、50リットルのパン型強制練りミキサーに、練り混ぜ水(水道水)、高炉スラグ組成物、細骨材(大井川水系産川砂、密度=2.58g/cm3)の各所定量を投入し、またセメント分散剤、乾燥収縮低減剤、膨張材等の混和材の各所定量を投入して、更に空気量調節剤(竹本油脂社製のAE剤、商品名AE-300)を投入し、45秒間練り混ぜた。最後に、粗骨材(岡崎産砕石、密度=2.68g/cm3)の所定量を投入し、60秒間練り混ぜて、目標スランプが18±1cm、目標空気量が4.5±1%とした水/高炉スラグ組成物の質量比が45%又は40%のコンクリート組成物を調製した。
表4に記載の配合条件で、実施例と同様な練り混ぜ方法により、水/高炉スラグ組成物の質量比が45%のコンクリート組成物を調製した。
表4に記載の配合条件で、実施例と同様な練り混ぜ方法により、高炉セメントB種を用いた水/高炉セメントの質量比が45%又は50%のコンクリート組成物を調製した。
二酸化炭素排出量:コンクリート組成物1m3を製造する場合の二酸化炭素の排出量(kg)。但し、石膏の製造に必要なエネルギーに由来する二酸化炭素の排出量を除いてポルトランドセメントの使用量から計算した値
セメント分散剤の種類:表1に記載した水溶性ビニル共重合体又は下記のP-5
P-5:ポリカルボン酸系の水溶性ビニル共重合体からなるセメント分散剤として、竹本油脂社製の商品名チューポールHP-11W(マレイン酸とα-アリル-ω-メチル-ポリオキシエチレンとの共重合体塩)
使用量:高炉スラグ組成物(比較例28及び29は高炉セメントB種)100質量部当たりの、セメント分散剤、乾燥収縮低減剤又は膨張材の固形分としての質量部
高炉スラグ組成物の種類:表2に記載したもの
*1:ジエチレングリコールモノブチルエーテル
*2:ジプロピレングリコールジエチレングリコールモノブチルエーテル
*3:太平洋マテリアル社製の商品名が太平洋ハイパーエクスパン(石灰系膨張材)
*4:高炉セメントB種(密度=3.04g/cm3、ブレーン値3850cm2/g)
調製した各例のコンクリート組成物について、空気量、スランプ、スランプ残存率を下記のように求めた。また各コンクリート組成物から得た硬化体について、乾燥収縮率及び圧縮強度を下記のように求めた。
・スランプ(cm):空気量の測定と同時に、JIS-A1101に準拠して測定した。
・スランプ残存率(%):(60分間静置後のスランプ/練り混ぜ直後のスランプ)×100で求めた。
・乾燥収縮率:JIS-A1129に準拠し、各例のコンクリート組成物を20℃×60%RHの条件下で保存した材齢26週の供試体についてコンパレータ法により乾燥収縮ひずみを測定し、乾燥収縮率を求めた。この数値は小さいほど、乾燥収縮が小さいことを示す。
・圧縮強度(N/mm2):各例のコンクリート組成物について、JIS-A1108に準拠し、材齢7日及び材齢28日で測定した。
比較例1、2、6、7、21~23及び25~27:目標とする流動性(スランプ値)が得られなかったので測定しなかった。
Claims (11)
- 少なくとも、結合材、水、細骨材、粗骨材及び混和材を含有して成るコンクリート組成物であって、結合材として下記の高炉スラグ組成物を用い、且つ水/該高炉スラグ組成物の質量比を30~60%に調製して成ることを特徴とする高炉スラグ組成物を用いたコンクリート組成物。
高炉スラグ組成物:粉末度が3000~13000cm2/gの高炉スラグ微粉末を80~95質量%及び石膏を5~20質量%(合計100質量%)の割合で含有する混合物100質量部当たり、アルカリ刺激材を0.5~1.5質量部又は5~45質量部の割合で添加した高炉スラグ組成物。 - アルカリ刺激材がポルトランドセメントである請求項1記載の高炉スラグ組成物を用いたコンクリート組成物。
- 石膏が無水石膏である請求項1又は2記載の高炉スラグ組成物を用いたコンクリート組成物。
- 高炉スラグ微粉末が、その粉末度が3500~6500cm2/gのものである請求項1~3のいずれか一つの項記載の高炉スラグ組成物を用いたコンクリート組成物。
- 混和材の少なくとも一部として、ポリカルボン酸系の水溶性ビニル共重合体からなるセメント分散剤を、高炉スラグ組成物100質量部当たり0.1~1.5質量部の割合で含有する請求項1~4のいずれか一つの項記載の高炉スラグ組成物を用いたコンクリート組成物。
- ポリカルボン酸系の水溶性ビニル共重合体が、分子中に下記の構成単位Aを45~80モル%、下記の構成単位Bを15~55モル%及び下記の構成単位Cを0~10モル%(合計100モル%)の割合で有する質量平均分子量が2000~80000のものである請求項1~5のいずれか一つの項記載の高炉スラグ組成物を用いたコンクリート組成物。
構成単位A:メタクリル酸から形成された構成単位及びメタクリル酸塩から形成された構成単位から選ばれる一つ又は二つ以上
構成単位B:5~150個のオキシエチレン単位で構成されたポリオキシエチレン基を有するメトキシポリエチレングリコールメタクリレートから形成された構成単位
構成単位C:(メタ)アリルスルホン酸塩から形成された構成単位及びメチルアクリレートから形成された構成単位から選ばれる一つ又は二つ以上 - 混和材の少なくとも一部として、ポリアルキレングリコールモノアルキルエーテルからなる乾燥収縮低減剤を、高炉スラグ組成物100質量部当たり0.2~4.0質量部の割合で含有する請求項1~6のいずれか一つの項記載の高炉スラグ組成物を用いたコンクリート組成物。
- 乾燥収縮低減剤が、ジエチレングリコールモノブチルエーテル及びジプロピレングリコールジエチレングリコールモノブチルエーテルから選ばれる一つ又は二つ以上である請求項7記載の高炉スラグ組成物を用いたコンクリート組成物。
- 混和材の少なくとも一部として、膨張材を、コンクリート組成物1m3当たり10~25kgの割合で含有する請求項1~8のいずれか一つの項記載の高炉スラグ組成物を用いたコンクリート組成物。
- 水/高炉スラグ組成物の質量比を35~55%に調製した請求項1~9のいずれか一つの項記載の高炉スラグ組成物を用いたコンクリート組成物。
- 得られる硬化体の乾燥収縮率が800×10-6以下となるものである請求項1~10のいずれか一つの項記載の高炉スラグ組成物を用いたコンクリート組成物。
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