JP2003073155A - Cement admixture, cement composition and high fluidity concrete using the same - Google Patents
Cement admixture, cement composition and high fluidity concrete using the sameInfo
- Publication number
- JP2003073155A JP2003073155A JP2001260970A JP2001260970A JP2003073155A JP 2003073155 A JP2003073155 A JP 2003073155A JP 2001260970 A JP2001260970 A JP 2001260970A JP 2001260970 A JP2001260970 A JP 2001260970A JP 2003073155 A JP2003073155 A JP 2003073155A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- admixture
- concrete
- slag
- cement composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C04B2111/00439—Physico-chemical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00448—Low heat cements
-
- 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
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、主に、土木・建築
業界において使用されるセメント混和材、セメント組成
物及びそれを用いてなる高流動コンクリートに関する。
なお、本発明における部や%は、特に規定しない限り質
量基準で示す。TECHNICAL FIELD The present invention mainly relates to a cement admixture used in the civil engineering / construction industry, a cement composition, and a high-fluidity concrete using the same.
The parts and% in the present invention are based on mass unless otherwise specified.
【0002】[0002]
【従来の技術】最近では、コンクリートの耐久性が大き
くクローズアップされ、コンクリートのひび割れを低減
して信頼性の高いコンクリートとするために、膨張材が
利用されている。これは、ひび割れが発生するとコンク
リートの劣化要因である中性化が進むためである。ひび
割れが低減できれば、中性化の影響を小さくすることが
でき、耐久性の高いコンクリート構造物の構築が可能と
なる。2. Description of the Related Art Recently, expansive materials have been used in order to reduce the number of cracks in concrete and make it highly reliable, because the durability of concrete has been greatly emphasized. This is because when cracks occur, carbonation, which is a cause of deterioration of concrete, progresses. If cracks can be reduced, it is possible to reduce the effect of neutralization and to construct a concrete structure with high durability.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、これは
あくまでも、巨視的な欠陥の少ない健全なコンクリート
構造物を構築するという意味であり、コンクリートその
ものの炭酸ガスの透過性とは趣旨を異にしている。すな
わち、炭酸ガスの透過はもっと微視的な空隙を介しても
進行する。したがって、巨視的な欠陥の少ない健全なコ
ンクリート構造物とした上で、コンクリート躯体そのも
のも炭酸ガスが透過しにくいコンクリートにすることが
望まれる。今日では、コンクリートに膨張性と共に中性
化抑制の双方を付与でき、水和発熱量も小さくできるセ
メント混和材の開発が待たれている。そこで、本発明者
は種々検討を重ねた結果、高炉徐冷スラグ粉末と膨張物
質を含有してなるセメント混和材が、膨張性と中性化抑
制の双方を付与でき、水和発熱量も小さくできることを
知見して本発明を完成するに至った。However, this means only to construct a sound concrete structure with few macroscopic defects, which is different from the purpose of the carbon dioxide permeability of concrete itself. . That is, the permeation of carbon dioxide also proceeds through more microscopic voids. Therefore, it is desired to make a concrete structure having few macroscopic defects and to make the concrete skeleton itself into a concrete through which carbon dioxide gas hardly permeates. Nowadays, development of a cement admixture that can impart both expansiveness and neutralization suppression to concrete and can reduce the heat of hydration is awaited. Therefore, as a result of various studies by the present inventor, a cement admixture containing a blast furnace slowly cooled slag powder and an expansive substance can impart both expansiveness and neutralization suppression, and the hydration calorific value is also small. The inventors have completed the present invention by finding out that they can be done.
【0004】[0004]
【課題を解決するための手段】即ち、本発明は、高炉徐
冷スラグ粉末と膨張物質を含有してなるセメント混和材
であり、高炉徐冷スラグのブレーン比表面積が4000
cm2/gを超えることを特徴とする該セメント混和材
であり、膨張物質の遊離石灰量が40%を超えることを
特徴とする該セメント混和材であり、セメントと、該セ
メント混和材とを含有してなるセメント組成物であり、
さらに、該セメント組成物を用いてなる高流動コンクリ
ートである。[Means for Solving the Problems] That is, the present invention is a cement admixture containing blast furnace slowly cooled slag powder and an expansive substance, wherein the blast furnace slowly cooled slag has a Blaine specific surface area of 4000.
The cement admixture characterized by exceeding cm 2 / g, and the cement admixture characterized in that the free lime content of the expansive substance exceeds 40%. The cement and the cement admixture are A cement composition containing
Further, it is a high-fluidity concrete obtained by using the cement composition.
【0005】[0005]
【発明の実施の形態】以下、本発明を詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
【0006】本発明で使用する高炉徐冷スラグ(以下、
徐冷スラグという)は、徐冷されて結晶化した高炉スラ
グである。The blast furnace slowly cooled slag used in the present invention (hereinafter,
Slowly cooled slag) is a blast furnace slag that is slowly cooled and crystallized.
【0007】徐冷スラグのブレーン比表面積は、400
0cm2/gを超えることが好ましく、4500cm2/
g以上がより好ましく、5000cm2/g以上がさら
に好ましい。ブレーン比表面積が4000cm2/g以
下では、材料分離抵抗性が得られない場合がある。The Blaine specific surface area of the slowly cooled slag is 400
It is preferably greater than 0cm 2 / g, 4500cm 2 /
g or more is more preferable, and 5000 cm 2 / g or more is further preferable. When the Blaine specific surface area is 4000 cm 2 / g or less, material separation resistance may not be obtained.
【0008】また、本発明で使用する徐冷スラグのガラ
ス化率は、30%以下が好ましく、10%以下がより好
ましい。ガラス化率が30%を超えると水和熱が大きく
なる場合がある。本発明でいうガラス化率(X)は、X
(%)=(1−S/S0)×100として求められる。
ここで、Sは粉末X線回折法により求められる徐冷スラ
グ中の主要な結晶性化合物であるメリライト(ゲーレナ
イト2CaO・Al2O3・SiO2とアケルマナイト2
CaO・MgO・2SiO2の固溶体)のメインピーク
の面積であり、S0は徐冷スラグを1000℃で3時間
加熱し、その後、5℃/分の冷却速度で冷却したものの
メリライトのメインピークの面積を表す。The vitrification rate of the slowly cooled slag used in the present invention is preferably 30% or less, more preferably 10% or less. If the vitrification ratio exceeds 30%, the heat of hydration may increase. The vitrification rate (X) in the present invention is X
(%) = (1−S / S 0 ) × 100.
Here, S is the major crystalline compound in slowly cooled slag obtained by a powder X-ray diffraction method melilite (gehlenite 2CaO · Al 2 O 3 · SiO 2 and Akerumanaito 2
CaO.MgO.2SiO 2 (solid solution) is the area of the main peak, and S 0 is the main peak of melilite of the slow cooling slag heated at 1000 ° C. for 3 hours and then cooled at a cooling rate of 5 ° C./min. It represents the area.
【0009】徐冷スラグの成分は、高炉水砕スラグと同
様の組成を有しており、具体的には、SiO2、Ca
O、Al2O3及びMgO等を主要な化学成分とし、その
他、TiO2、MnO、Na2O、S、P2O5及びFe2
O3等を含有する場合がある。The components of the slowly cooled slag have the same composition as the granulated blast furnace slag, and specifically, SiO 2 , Ca
O, Al 2 O 3 and MgO are the main chemical components, and TiO 2 , MnO, Na 2 O, S, P 2 O 5 and Fe 2
It may contain O 3 and the like.
【0010】本発明のセメント混和材(以下、本混和材
という)の使用量は、特に限定されるものではないが、
通常、セメント100部に対して、10〜250部程度
の範囲で使用することが好ましく、20〜150部程度
の範囲で使用することがより好ましい。10部未満では
水和熱を抑制するという本発明の効果が十分に得られな
い場合があり、250部を超えて使用すると、強度発現
性が悪くなる場合がある。The use amount of the cement admixture of the present invention (hereinafter referred to as the present admixture) is not particularly limited,
Usually, it is preferably used in the range of 10 to 250 parts, and more preferably in the range of 20 to 150 parts, relative to 100 parts of cement. If it is less than 10 parts, the effect of the present invention of suppressing the heat of hydration may not be sufficiently obtained, and if it is used in excess of 250 parts, the strength development may deteriorate.
【0011】本発明に係る膨張物質とは、特に限定され
るものではなく、いかなるものでも使用可能である。大
別すると、ガス発泡物質系、セメント鉱物系がある。そ
の具体例としては例えば、ガス発泡物質系では、アルミ
粉、鉄粉、過酸化物質及び炭素物質等が挙げられる。ま
た、セメント鉱物系では、エトリンガイト系や石灰系、
及び石灰−エトリンガイト複合系等が挙げられる。本発
明では、効果的な膨張性が付与できる観点から、セメン
ト鉱物系を用いることが好ましい。The expansive substance according to the present invention is not particularly limited, and any substance can be used. Broadly classified, there are gas foaming substances and cement minerals. Specific examples thereof include aluminum powder, iron powder, a peroxide substance, and a carbon substance in the gas foaming substance system. In cement minerals, ettringite and lime,
And lime-ettringite complex system and the like. In the present invention, it is preferable to use a cement mineral type from the viewpoint that effective expansion can be imparted.
【0012】セメント鉱物系の膨張物質としては、遊離
石灰や遊離マグネシアを含むものが挙げられるが、長期
安定性の観点から、遊離石灰を含むものが好ましい。遊
離石灰を含むものとしては、例えば、遊離石灰-無水セ
ッコウ系、遊離石灰-水硬性化合物系及び遊離石灰-水硬
性化合物-無水セッコウ系等が挙げられる。本発明で
は、膨張性能が良好なことから、遊離石灰-水硬性化合
物-無水セッコウ系を用いることが好ましく、特に遊離
石灰含有量が40%を超えるものが好ましい。ここで、
水硬性化合物としては、例えば、アウイン、カルシウム
フェライト、カルシウムアルミノフェライト、カルシウ
ムシリケート、カルシウムアルミネート等の1種又は2
種以上が挙げられる。膨張物質としては、市販の膨張材
や静的破砕材が利用できる。膨張材や静的破砕材は各社
より市販されており、その代表例としては、例えば、電
気化学工業社製「デンカCSA」、「デンカパワーCS
A」、住友大阪セメント社製「サクス」、太平洋マテリ
アル社製「エクスパン」、「N-EX」、「ブライスタ
ー」、「ジプカル」等が挙げられる。Examples of the cement mineral-based expansive substance include those containing free lime and free magnesia, and those containing free lime are preferable from the viewpoint of long-term stability. Examples of the substance containing free lime include free lime-anhydrous gypsum system, free lime-hydraulic compound system and free lime-hydraulic compound-anhydrous gypsum system. In the present invention, it is preferable to use a free lime-hydraulic compound-anhydrous gypsum system because the expansion performance is good, and a free lime content of more than 40% is particularly preferable. here,
As the hydraulic compound, for example, one or two of hain, calcium ferrite, calcium aluminoferrite, calcium silicate, calcium aluminate, etc.
There are more than one species. As the expansive substance, commercially available expansive materials and statically crushed materials can be used. Expansive materials and statically crushed materials are commercially available from various companies, and typical examples thereof include Denka CSA and Denka Power CS manufactured by Denki Kagaku Kogyo Co., Ltd.
"A", "Saks" manufactured by Sumitomo Osaka Cement Co., Ltd., "Expan" manufactured by Taiheiyo Materials Co., Ltd., "N-EX", "Blyster", "Zipcal" and the like.
【0013】本混和材中の徐冷スラグと膨張物質の配合
割合は、特に限定されるものではないが、通常、徐冷ス
ラグと膨張物質の合計100部中、徐冷スラグは50〜
97部が好ましく、70〜95部がより好ましい。ま
た、膨張物質は3〜50部が好ましく、5〜30部がよ
り好ましい。膨張物質が50部を超えたり、徐冷スラグ
が50部未満であると、中性化抑制効果が不十分になる
場合がある。また、膨張物質が3部未満であったり、徐
冷スラグが97部を超えると、膨張性能が不十分となる
場合がある。The blending ratio of the slow cooling slag and the expansive substance in the admixture is not particularly limited, but usually 50 to 50% of the slow cooling slag and the expansive substance in total 100 parts.
97 parts are preferable, and 70 to 95 parts are more preferable. The expansive substance is preferably 3 to 50 parts, more preferably 5 to 30 parts. If the expandable substance exceeds 50 parts or the slowly cooled slag is less than 50 parts, the effect of suppressing neutralization may be insufficient. Further, if the expansion substance is less than 3 parts or if the slowly cooled slag exceeds 97 parts, the expansion performance may be insufficient.
【0014】本発明で使用するセメントとしては、普
通、早強、超早強、低熱及び中庸熱等の各種ポルトラン
ドセメントや、これらポルトランドセメントに、高炉水
砕スラグ、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、石灰石粉末等を混合したフィラーセメント
等が挙げられ、これらのうちの一種又は二種以上が使用
可能である。As the cement used in the present invention, various kinds of portland cement such as normal, early strength, ultrafast strength, low heat and moderate heat, and various kinds of these portland cement mixed with granulated blast furnace slag, fly ash or silica. Examples thereof include mixed cement and filler cement in which limestone powder is mixed, and one or more of these can be used.
【0015】本発明のセメント組成物は、それぞれの材
料を施工時に混合してもよいし、あらかじめ一部あるい
は全部を混合しておいても差し支えない。In the cement composition of the present invention, the respective materials may be mixed at the time of construction, or some or all of them may be mixed in advance.
【0016】本発明のセメント組成物の粒度は、使用す
る目的や用途に依存するため特に限定されるものではな
いが、通常、ブレーン比表面積で3000〜8000c
m2/gが好ましく、4000〜6000cm2/gがよ
り好ましい。3000cm2/g未満では強度発現性が
十分に得られない場合があり、8000cm2/gを超
えると作業性が悪くなる場合がある。The particle size of the cement composition of the present invention is not particularly limited because it depends on the purpose and application to be used, but it is usually a Blaine specific surface area of 3000 to 8000 c.
m 2 / g is preferable, and 4000 to 6000 cm 2 / g is more preferable. If it is less than 3000 cm 2 / g, sufficient strength development may not be obtained, and if it exceeds 8000 cm 2 / g, workability may be deteriorated.
【0017】本発明で使用する高流動コンクリートと
は、従来の振動締め固めを必要としない自己充填性を有
し、材料分離を生じないコンクリートを総称するもので
あり、流動性の指標となるスランプフロー値が650±
50mmであることが好ましい。The high-fluidity concrete used in the present invention is a generic name for concretes that have a self-filling property that does not require conventional vibration compaction and do not cause material separation, and are slumps that are indicators of fluidity. Flow value is 650 ±
It is preferably 50 mm.
【0018】高流動コンクリートを調製する際には、通
常使用される減水剤、AE減水剤、高性能減水剤及び高
性能AE減水剤等を用いて高流動化することが好まし
い。減水剤は液状や粉末状のものが市販されており、い
ずれも使用可能である。また、減水剤はナフタレン系、
メラミン系、アミノスルホン酸系及びポリカルボン酸系
に大別される。本発明では、特に高性能AE減水剤の使
用が好ましく、その具体例としては、ナフタレン系で
は、エヌエムビー社製商品名「レオビルドSP-9シリー
ズ」、花王社製商品名「マイティ2000シリーズ」、及び
日本製紙社製商品名「サンフローHS-100」等が挙げられ
る。メラミン系では、日本シーカ社製商品名「シーカメ
ント1000シリーズ」や日本製紙社製商品名「サンフロー
HS-40」等が挙げられる。アミノスルホン酸系では、藤
沢薬品工業社製商品名「パリックFP-200シリーズ」等が
挙げられる。ポリカルボン酸系では、エヌエムビー社製
商品名「レオビルドSP-8シリーズ」、グレースケミカル
ズ社製商品名「ダーレックススーパー100PHX」、及び竹
本油脂社製商品名「チューポールHP-8シリーズ」や「チ
ューポールHP-11シリーズ」等が挙げられる。When preparing a high-fluidity concrete, it is preferable to use a water-reducing agent, an AE water-reducing agent, a high-performance water-reducing agent, a high-performance AE water-reducing agent, etc., which are commonly used, so as to have a high fluidity. Liquid reducing agents and powdery reducing agents are commercially available, and any of them can be used. Also, the water reducing agent is a naphthalene type,
It is roughly classified into melamine type, aminosulfonic acid type and polycarboxylic acid type. In the present invention, it is particularly preferable to use a high-performance AE water reducing agent, and specific examples thereof include naphthalene-based products, which are trade names "Reobuild SP-9 series" manufactured by NM, "Mighty 2000 series" manufactured by Kao Corporation, and Examples include the product name “Sunflow HS-100” manufactured by Nippon Paper Industries. In the melamine series, the product name “Cikament 1000 Series” manufactured by Nippon Sika and the product name “Sunflow” manufactured by Nippon Paper Industries
HS-40 ”and the like. Examples of aminosulfonic acid-based products include "Palic FP-200 series" manufactured by Fujisawa Pharmaceutical Co., Ltd. In the case of polycarboxylic acid type, NMBY trade name "Reobuild SP-8 series", Grace Chemicals trade name "Darlex Super 100PHX", and Takemoto Yushi Co. trade name "Chupol HP-8 series" and "Chew Paul HP-11 series ”and the like.
【0019】本発明では、これら減水剤のうちの一種又
は二種以上が使用可能である。減水剤の使用量は、特に
限定されるものではないが、通常、各メーカーの指定す
る範囲内で使用すればよく、具体的には、セメントや本
混和材からなる粉体100部に対して、0.5〜3.0
部程度である。In the present invention, one or more of these water reducing agents can be used. The amount of the water reducing agent is not particularly limited, but it is usually used within the range specified by each manufacturer, specifically, to 100 parts of powder made of cement or the present admixture. , 0.5 to 3.0
It is about a part.
【0020】水の使用量は、特に限定されるものではな
いが、通常、コンクリート1m3当たり、125〜22
5kgが好ましく、140〜185kgがより好まし
い。The amount of water used is not particularly limited, but is usually 125 to 22 per 1 m 3 of concrete.
5 kg is preferable, and 140 to 185 kg is more preferable.
【0021】本発明では、セメント、本混和材、砂や砂
利等の骨材及び減水剤の他に、従来からコンクリートに
用いられてきた高炉水砕スラグ微粉末、石灰石微粉末、
フライアッシュ及びシリカフューム等の混和材料、収縮
低減剤、消泡剤、増粘剤、防錆剤、防凍剤、高分子エマ
ルジョン、凝結調整剤、ベントナイト等の粘土鉱物、並
びにハイドロタルサイト等のアニオン交換体等のうちの
一種又は二種以上を、本発明の目的を実質的に阻害しな
い範囲で使用することが可能である。In the present invention, in addition to cement, the present admixture, an aggregate such as sand and gravel, and a water reducing agent, ground granulated blast furnace slag, limestone fine powder, which has been conventionally used for concrete,
Admixture materials such as fly ash and silica fume, shrinkage reducing agents, antifoaming agents, thickeners, rust preventives, antifreeze agents, polymer emulsions, setting regulators, clay minerals such as bentonite, and anion exchange such as hydrotalcite. One or more of the body and the like can be used within a range that does not substantially impair the object of the present invention.
【0022】本発明において、各材料の混合方法は、特
に限定されるものではなく、それぞれの材料を施工時に
混合しても良いし、あらかじめ一部を、あるいは全部を
混合しておいても差し支えない。混合装置としては、既
存のいかなる装置も使用可能であり、例えば、傾胴ミキ
サ、オムニミキサ、ヘンシェルミキサ、V型ミキサ及び
ナウタミキサ等の使用が可能である。In the present invention, the method of mixing the respective materials is not particularly limited, and the respective materials may be mixed at the time of construction, or some or all of them may be mixed in advance. Absent. As the mixing device, any existing device can be used, and for example, a tilting barrel mixer, an omni mixer, a Henschel mixer, a V-type mixer and a Nauta mixer can be used.
【0023】[0023]
【実施例】以下、本発明の実施例に基づいてさらに説明
する。EXAMPLES The present invention will be further described below with reference to examples.
【0024】実施例1
表1に示すような割合でセメント、膨張物質及び徐冷ス
ラグ粉末を使用し、結合材と砂の比率が1対3、水セメ
ント比が50%のモルタルを調製し、圧縮強度、長さ変
化率及び中性化抵抗性を測定した。ただし、膨張物質は
結合材の一部として配合し、徐冷スラグは砂の一部とし
て配合した。結果を表1に併記した。Example 1 A mortar having a binder-sand ratio of 1 to 3 and a water-cement ratio of 50% was prepared by using cement, an expansive substance and slowly cooled slag powder in the proportions shown in Table 1. Compressive strength, rate of change in length and resistance to neutralization were measured. However, the expanding material was blended as a part of the binder and the slowly cooled slag was blended as a part of the sand. The results are also shown in Table 1.
【0025】<使用材料>
セメント:市販の普通ポルトランドセメント、ブレーン
比表面積3200cm2/g、比重3.15
スラグa:徐冷スラグ、ブレーン比表面積3000cm
2/g、ガラス化率5%、比重3.00
石灰石微粉末:新潟県青海鉱山産石灰石の粉砕品、ブレ
ーン比表面積6000cm2/g、比重2.70
膨張物質A:電気化学工業社製「デンカパワーCS
A」、遊離石灰−水硬性化合物−無水セッコウ系、ブレ
ーン比表面積2900cm2/g。遊離石灰量50%
砂:JIS標準砂(ISO679準拠)
水:水道水<Materials used> Cement: Commercially available ordinary Portland cement, Blaine specific surface area 3200 cm 2 / g, specific gravity 3.15 Slag a: Slowly cooled slag, Blaine specific surface area 3000 cm
2 / g, vitrification rate 5%, specific gravity 3.00 Limestone fine powder: crushed limestone from Aomi mine, Niigata Prefecture, Blaine specific surface area 6000 cm 2 / g, specific gravity 2.70 Expansion material A: manufactured by Denki Kagaku Kogyo Co., Ltd. Denka Power CS
A ", free lime-hydraulic compound-anhydrite system, Blaine specific surface area 2900 cm 2 / g. 50% free lime Sand: JIS standard sand (ISO679 compliant) Water: Tap water
【0026】<測定方法>
圧縮強度:4×4×16cm供試体を作製し、JIS
R 5201に準じて材齢28日強度を測定。
長さ変化率:JIS A 6202に準じて、材齢28
日の長さ変化率を測定。ただし、材齢1日で脱型し、材
齢7日までは水中養生を行い、以後材齢28日までは2
0℃・相対湿度60%の環境で気乾養生を行った。
中性化深さ:4×4×16cm供試体を作製し、材齢2
8日まで20℃水中養生を施した後、30℃・相対湿度
60%・炭酸ガス濃度5%の環境で促進中性化を行い、
8週間後に供試体を輪切りにし、断面にフェノールフタ
レインアルコール溶液を塗布して中性化深さを確認。<Measurement method> Compressive strength: 4 × 4 × 16 cm A test piece was prepared and JIS
28-day-old strength is measured according to R5201. Rate of change in length: According to JIS A 6202, material age 28
Measure the rate of change in length of day. However, demolding is carried out at the age of 1 day, underwater curing is carried out until the age of 7 days, and thereafter, it is kept at 2 days until the age of 28 days.
Air-drying curing was performed in an environment of 0 ° C. and relative humidity of 60%. Neutralization depth: 4 x 4 x 16 cm Specimen was prepared and aged 2
After curing in water at 20 ° C for up to 8 days, accelerated neutralization is performed in an environment of 30 ° C, relative humidity of 60%, and carbon dioxide concentration of 5%.
After 8 weeks, the specimen was sliced into slices and the cross-section was coated with a phenolphthalein alcohol solution to confirm the neutralization depth.
【0027】[0027]
【表1】 [Table 1]
【0028】表1より、本混和材を含有したセメント組
成物を使用することにより、モルタルに膨張性と中性化
抑制効果を付与できることが判る。From Table 1, it can be seen that the use of the cement composition containing the present admixture can impart expandability and neutralization suppressing effect to the mortar.
【0029】実施例2
単位セメント量280kg/m3、単位膨張物質A量2
0kg/m3、単位スラグ量250kg/m3、水/粉体
比=30%、s/a=48%、及び空気量4.5±1.
5%のコンクリートを調製し、スラグの種類を表2に示
すように変えて実験を行った。これらのコンクリートの
スランプフロー値、断熱温度上昇量、圧縮強度、自己寸
法変化、及び中性化深さについて測定した。また、中性
化に対する抵抗性を検討するために、同一配合の場合に
徐冷スラグ微粉末と圧縮強度が同等となる、石灰石微粉
末を混和した場合についても同様の実験を行った。結果
を表2に併記する。Example 2 Unit cement amount 280 kg / m 3 , unit expansive substance A amount 2
0 kg / m 3 , unit slag amount 250 kg / m 3 , water / powder ratio = 30%, s / a = 48%, and air amount 4.5 ± 1.
An experiment was conducted by preparing 5% concrete and changing the type of slag as shown in Table 2. The slump flow value, adiabatic temperature rise, compressive strength, self-dimensional change, and neutralization depth of these concretes were measured. In addition, in order to examine the resistance to neutralization, the same experiment was performed in the case of mixing limestone fine powder, which has the same compressive strength as the slowly cooled slag fine powder in the case of the same composition. The results are also shown in Table 2.
【0030】<使用材料>
スラグb:徐冷スラグ、ブレーン比表面積4000cm
2/g、ガラス化率5%、比重3.00
スラグc:徐冷スラグ、ブレーン比表面積4500cm
2/g、ガラス化率5%、比重3.00
スラグd:徐冷スラグ、ブレーン比表面積5000cm
2/g、ガラス化率5%、比重3.00
スラグe:徐冷スラグ、ブレーン比表面積6000cm
2/g、ガラス化率5%、比重3.00
スラグf:徐冷スラグ、ブレーン比表面積6000cm
2/g、ガラス化率30%、比重2.96
スラグg:徐冷スラグ、ブレーン比表面積6000cm
2/g、ガラス化率50%、比重2.94
スラグh:急冷スラグ、ブレーン比表面積6000cm
2/g、ガラス化率95%、比重2.90
砂:新潟県姫川産、比重2.62
砂利:新潟県姫川産、砕石、比重2.64
高性能AE減水剤:ポリカルボン酸系、市販品<Materials used> Slag b: slowly cooled slag, Blaine specific surface area 4000 cm
2 / g, vitrification rate 5%, specific gravity 3.00 slag c: slowly cooled slag, brane specific surface area 4500 cm
2 / g, vitrification rate 5%, specific gravity 3.00 slag d: slowly cooled slag, brane specific surface area 5000 cm
2 / g, vitrification rate 5%, specific gravity 3.00 slag e: slowly cooled slag, brane specific surface area 6000 cm
2 / g, vitrification rate 5%, specific gravity 3.00 slag f: slowly cooled slag, brane specific surface area 6000 cm
2 / g, vitrification rate 30%, specific gravity 2.96 slag g: slowly cooled slag, brane specific surface area 6000 cm
2 / g, vitrification rate 50%, specific gravity 2.94 slag h: quenched slag, brane specific surface area 6000 cm
2 / g, vitrification rate 95%, specific gravity 2.90 Sand: Himekawa, Niigata, specific gravity 2.62 Gravel: Himekawa, Niigata, crushed stone, specific gravity 2.64 High-performance AE water reducing agent: polycarboxylic acid type, commercially available Goods
【0031】<測定方法>
材料分離:目視により観察。材料分離が生じた場合は
×、やや分離気味の場合は△、材料分離が全く生じない
場合は○で表示。
スランプフロー:財団法人、沿岸開発技術センター及び
漁港漁村建設技術研究所発行、水中不分離性コンクリー
ト・マニュアル、付録1「水中不分離性コンクリートの
試験、スランプフロー試験」に基づいてコンクリートの
広がりを直角方向に2点測定した平均値
自己寸法変化:JCI自己収縮研究委員会報告書に準じ
て測定。材齢56日におけるひずみとして表示。
断熱温度上昇量:東京理工社製の断熱温度上昇量測定装
置を用いて打設温度20℃の条件で測定。
圧縮強度:10φ×20cm供試体を作製し、JIA
A 1108に準じて材齢28日強度を測定。ただし、
脱型は材齢7日に行い、以後20℃の水中養生を行っ
た。
中性化深さ:10φ×20cm供試体を作製し、材齢2
8日まで20℃水中養生を施した後、30℃・相対湿度
60%・炭酸ガス濃度5%の環境で促進中性化を行い、
6ヶ月後に供試体を輪切りにし、断面にフェノールフタ
レインアルコール溶液を塗布して中性化深さを確認。<Measurement method> Material separation: Visual observation. When the material separation occurs, it is indicated by x, when it is slightly separated, it is indicated by Δ, and when the material separation does not occur at all, it is indicated by ○. Slump Flow: Underwater non-separable concrete manual, published by Foundation, Coastal Development Technology Center and Fisheries Harbor Fisheries Construction Research Institute, Appendix 1 "Underwater Non-separable Concrete Test, Slump Flow Test" Measured at two points in the same direction Self-dimensional change: Measured according to the JCI Self-contraction Research Committee Report. Displayed as strain at age 56 days. Adiabatic temperature rise amount: Measured under the condition of a placing temperature of 20 ° C. using an adiabatic temperature rise amount measuring device manufactured by Tokyo Riko Co., Ltd. Compressive strength: 10φ × 20cm Specimen was prepared and JIA
28-day-old strength is measured according to A 1108. However,
The demolding was carried out on the 7th day of age, and thereafter, it was cured in water at 20 ° C. Neutralization depth: 10φ x 20 cm Specimen was prepared and the material age was 2
After curing in water at 20 ° C for up to 8 days, accelerated neutralization is performed in an environment of 30 ° C, relative humidity of 60%, and carbon dioxide concentration of 5%.
Six months later, the specimen was sliced into rings and the cross-section was coated with a phenolphthalein alcohol solution to confirm the neutralization depth.
【0032】[0032]
【表2】 [Table 2]
【0033】表2より、本混和材を含有したセメント組
成物を使用することにより、高流動コンクリートの材料
分離抵抗性が大きく、水和発熱量が小さく、中性化され
難いことが判る。また、低水比のコンクリートでも自己
収縮を小さく抑えることができる。特に、ブレーン比表
面積が4000cm2/gを超える徐冷スラグを使用す
ることが好ましい。From Table 2, it can be seen that by using the cement composition containing the present admixture, the resistance to material separation of the high fluidity concrete is high, the calorific value of hydration is low, and it is difficult to neutralize. Further, even in a concrete having a low water ratio, self-shrinkage can be suppressed to be small. Particularly, it is preferable to use the slowly cooled slag having a Blaine specific surface area of more than 4000 cm 2 / g.
【0034】実施例3
単位セメント量と単位スラグ量を表3に示すようにした
こと以外は、実施例2と同様に行った。結果を表3に併
記する。Example 3 Example 3 was repeated except that the unit cement amount and the unit slag amount were as shown in Table 3. The results are also shown in Table 3.
【0035】[0035]
【表3】 [Table 3]
【0036】表3より、本混和材を含有したセメント組
成物を使用することにより、高流動コンクリートの材料
分離抵抗性が大きく、水和発熱量が小さく、中性化され
難いことが判る。また、低水比のコンクリートでも自己
収縮を小さく抑えることができる。From Table 3, it can be seen that by using the cement composition containing the present admixture, the material separation resistance of the high-fluidity concrete is large, the calorific value of hydration is small, and it is difficult to neutralize. Further, even in a concrete having a low water ratio, self-shrinkage can be suppressed to be small.
【0037】実施例4
セメントと膨張物質からなる単位結合材量300kg/
m3、単位スラグ量250kg/m3、単位水量165k
g/m3、s/aが48%の高流動コンクリートにおい
て、結合材中の膨張物質の種類と量を表4に示すように
変えたこと以外は、実施例2と同様に行った。結果を表
4に併記する。Example 4 300 kg / unit of binder composed of cement and expansive substance
m 3 , unit slag amount 250 kg / m 3 , unit water amount 165 k
In high-fluidity concrete with g / m 3 and s / a of 48%, the same procedure as in Example 2 was performed, except that the type and amount of the expansive substance in the binder were changed as shown in Table 4. The results are also shown in Table 4.
【0038】<使用材料>
膨張物質B:電気化学工業社製「デンカCSA#2
0」、遊離石灰−水硬性化合物−無水セッコウ系、ブレ
ーン比表面積2800cm2/g、遊離石灰量20%。
膨張物質C:太平洋マテリアル社製「エクスパン構造
用」、遊離石灰−水硬性化合物−無水セッコウ系、ブレ
ーン比表面積3500cm2/g、遊離石灰量33%。<Material used> Expansion material B: Denka CSA # 2 manufactured by Denki Kagaku Kogyo Co., Ltd.
0 ", free lime-hydraulic compound-anhydrous gypsum system, Blaine specific surface area 2800 cm 2 / g, amount of free lime 20%. Expanding substance C: "Expans structure" manufactured by Taiheiyo Materials, free lime-hydraulic compound-anhydrous gypsum system, Blaine specific surface area 3500 cm 2 / g, free lime amount 33%.
【0039】[0039]
【表4】 [Table 4]
【0040】表4より、本混和材中の膨張物質の配合割
合を増やしていくと、自己収縮の無いコンクリートを作
製できることが判る。特に、遊離石灰量が40%を超え
る膨張物質Aを使用することが好ましい。From Table 4, it can be seen that concrete having no self-shrinkage can be prepared by increasing the mixing ratio of the expansive substance in the admixture. In particular, it is preferable to use the expansive substance A whose free lime amount exceeds 40%.
【0041】[0041]
【発明の効果】本混和材を含有したセメント組成物を使
用することにより、膨張性と中性化抑制効果を付与で
き、水和発熱量が小さく、材料分離抵抗性が大きく、中
性化され難いコンクリートとすることができる。また、
高流動コンクリートのような低水比のコンクリートに適
用しても自己収縮を小さく抑えることができる等の効果
を奏する。EFFECTS OF THE INVENTION By using a cement composition containing the present admixture, it is possible to impart expandability and neutralization suppressing effect, a small heat of hydration, large resistance to material separation, and neutralization. Can be difficult concrete. Also,
Even when it is applied to concrete having a low water ratio such as high-fluidity concrete, it has an effect of suppressing self-shrinkage to a small extent.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 樋口 隆行 新潟県西頸城郡青海町大字青海2209番地 電気化学工業株式会社青海工場内 Fターム(参考) 4G012 PA10 PA28 PB08 PB11 PC09 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Takayuki Higuchi 2209 Aomi, Aomi-cho, Aomi-cho, Nishikubiki-gun, Niigata Prefecture Denki Kagaku Co., Ltd. Aomi factory F term (reference) 4G012 PA10 PA28 PB08 PB11 PC09
Claims (5)
てなるセメント混和材。1. A cement admixture containing blast furnace slowly cooled slag powder and an expansive substance.
が4000cm2/gを超えることを特徴とする請求項
1記載のセメント混和材。2. The cement admixture according to claim 1, wherein the blast furnace slowly cooled slag powder has a Blaine specific surface area of more than 4000 cm 2 / g.
ことを特徴とする請求項1又は2記載のセメント混和
材。3. The cement admixture according to claim 1, wherein the expansive substance has a free lime content of more than 40%.
載のセメント混和材とを含有してなるセメント組成物。4. A cement composition comprising cement and the cement admixture according to claim 1.
なる高流動コンクリート。5. A high-fluidity concrete obtained by using the cement composition according to claim 4.
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005119935A (en) * | 2003-09-25 | 2005-05-12 | Denki Kagaku Kogyo Kk | Cement admixture, cement composition, and cement concrete |
JP2005272156A (en) * | 2004-03-23 | 2005-10-06 | Denki Kagaku Kogyo Kk | Cement admixture, cement composition, quick hardening grout material, quick hardening grout, and method for preventing deformation of natural ground using the same |
JP2006232625A (en) * | 2005-02-25 | 2006-09-07 | Sumitomo Osaka Cement Co Ltd | Concrete base material for placing at cold time, concrete structure using the base material and method of manufacturing the same |
JP2008194883A (en) * | 2007-02-09 | 2008-08-28 | Sumitomo Osaka Cement Co Ltd | Concrete product and its manufacturing method |
JP2011020921A (en) * | 2010-10-20 | 2011-02-03 | Sumitomo Osaka Cement Co Ltd | Concrete material for placing in cold weather, and concrete structure using the material |
CN102251782A (en) * | 2010-05-19 | 2011-11-23 | 闫冬生 | Novel underground anchor spraying concrete |
JP2014037329A (en) * | 2012-08-15 | 2014-02-27 | Denki Kagaku Kogyo Kk | Underwater non-separable concrete |
WO2021246288A1 (en) * | 2020-06-02 | 2021-12-09 | デンカ株式会社 | Cement admixture and cement composition |
Citations (2)
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---|---|---|---|---|
JP2001064054A (en) * | 1999-08-25 | 2001-03-13 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
JP2001064053A (en) * | 1999-08-25 | 2001-03-13 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
-
2001
- 2001-08-30 JP JP2001260970A patent/JP5116193B2/en not_active Expired - Fee Related
Patent Citations (2)
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JP2001064054A (en) * | 1999-08-25 | 2001-03-13 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
JP2001064053A (en) * | 1999-08-25 | 2001-03-13 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005119935A (en) * | 2003-09-25 | 2005-05-12 | Denki Kagaku Kogyo Kk | Cement admixture, cement composition, and cement concrete |
JP2005272156A (en) * | 2004-03-23 | 2005-10-06 | Denki Kagaku Kogyo Kk | Cement admixture, cement composition, quick hardening grout material, quick hardening grout, and method for preventing deformation of natural ground using the same |
JP2006232625A (en) * | 2005-02-25 | 2006-09-07 | Sumitomo Osaka Cement Co Ltd | Concrete base material for placing at cold time, concrete structure using the base material and method of manufacturing the same |
JP2008194883A (en) * | 2007-02-09 | 2008-08-28 | Sumitomo Osaka Cement Co Ltd | Concrete product and its manufacturing method |
CN102251782A (en) * | 2010-05-19 | 2011-11-23 | 闫冬生 | Novel underground anchor spraying concrete |
JP2011020921A (en) * | 2010-10-20 | 2011-02-03 | Sumitomo Osaka Cement Co Ltd | Concrete material for placing in cold weather, and concrete structure using the material |
JP2014037329A (en) * | 2012-08-15 | 2014-02-27 | Denki Kagaku Kogyo Kk | Underwater non-separable concrete |
WO2021246288A1 (en) * | 2020-06-02 | 2021-12-09 | デンカ株式会社 | Cement admixture and cement composition |
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