JP2002060261A - Cement admixture and cement composition - Google Patents
Cement admixture and cement compositionInfo
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- JP2002060261A JP2002060261A JP2000243711A JP2000243711A JP2002060261A JP 2002060261 A JP2002060261 A JP 2002060261A JP 2000243711 A JP2000243711 A JP 2000243711A JP 2000243711 A JP2000243711 A JP 2000243711A JP 2002060261 A JP2002060261 A JP 2002060261A
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- cement
- raw material
- cement admixture
- free
- admixture
- Prior art date
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- 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
分野において使用されるセメント混和材及びセメント組
成物に関する。The present invention relates to a cement admixture and a cement composition mainly used in the fields of civil engineering and construction.
【０００２】[0002]
【従来の技術】セメント・コンクリートのひび割れ低減
や曲げ耐力の向上は、コンクリート構造物の信頼性、耐
久性、美観等の観点から最も重要であり、これらを改善
するためセメント系膨張材の開発が行われてきたが、更
なる技術の進展が望まれている。セメント系膨張材とし
ては、例えば、遊離石灰−アウイン−無水セッコウ系膨
張材（特公昭42-21840号公報）や遊離石灰−カルシウム
シリケート−無水セッコウ系膨張材（特公昭53-31170号
公報）等が知られている。2. Description of the Related Art Reduction of cracks and improvement of bending strength of cement and concrete are most important from the viewpoint of reliability, durability and aesthetics of concrete structures. Although it has been done, further technological progress is desired. Examples of the cement-based expanding material include free lime-auin-anhydrous gypsum-based expanding material (Japanese Patent Publication No. 42-21840) and free lime-calcium silicate-anhydrous gypsum-based expanding material (Japanese Patent Application No. 53-31170). It has been known.
【０００３】[0003]
【発明が解決しようとする課題】近年、コンクリートの
高性能化を目的に、高流動コンクリートや高強度コンク
リートの開発が盛んに行われているものの、これら高性
能コンクリートにおいては、セメント系膨張材の効果が
十分に発揮されない点が指摘され、膨張材の混和率が小
さくても大きな膨張性を付与できる、膨張性能の優れた
膨張材の開発が待たれている。In recent years, high-performance concrete and high-strength concrete have been actively developed for the purpose of improving the performance of concrete. It is pointed out that the effect is not sufficiently exhibited, and development of an expandable material having excellent expandability, which can provide a large expandability even if the mixing ratio of the expandable material is small, has been awaited.
【０００４】また、最近では従来の仕様規定型の設計体
系から、性能規定型の設計体系への移行が検討されてお
り、これまでやや軽視されていたコンクリートの耐久性
についても明確な性能規定が定められる方向にある。即
ち、ひび割れに対する耐久性について、その影響を定量
化することが検討されているため、ひび割れの低減は一
層重要な課題となってきている。従って、使用量が少な
く、経済的負担が小さく、ひび割れ低減に効果のある優
れた膨張性能を有するセメント系膨張材が不可欠であ
る。[0004] Recently, a transition from a conventional specification-based design system to a performance-based design system has been studied, and a clear performance specification has been established for the durability of concrete, which has been somewhat neglected. It is in a determined direction. That is, it is studied to quantify the influence on the durability against cracks, and thus reducing the cracks has become an even more important issue. Therefore, a cement-based expandable material having a small amount of use, a small economic burden, and an excellent expandability that is effective in reducing cracks is indispensable.
【０００５】本発明者らは、これらの課題を解決すべく
種々の検討を重ねた結果、特定のセメント混和材を使用
することにより、前記課題が解決できるとの知見を得て
本発明を完成するに至った。The present inventors have conducted various studies to solve these problems, and as a result, obtained the knowledge that the above problems can be solved by using a specific cement admixture, and completed the present invention. I came to.
【０００６】[0006]
【課題を解決するための手段】即ち、本発明は、ＣａＯ
原料、ＭｇＯ原料、Ｆｅ2Ｏ3原料及びＣａＳＯ4原料を
熱処理して得られる物質であって、遊離石灰、遊離マグ
ネシア、カルシウムフェライト及び無水セッコウを含有
してなるセメント混和材であり、遊離石灰含有率が３０
〜６５％、遊離マグネシア含有率が１〜１０％であるこ
とを特徴とする該セメント混和材であり、更にセメント
と、該セメント混和材とを含有してなるセメント組成物
である。なお、本発明で用いる部、％は質量単位を表
す。That is, the present invention provides CaO
A material obtained by heat-treating a raw material, a MgO raw material, a Fe 2 O 3 raw material, and a CaSO 4 raw material, which is a cement admixture containing free lime, free magnesia, calcium ferrite, and anhydrous gypsum. Rate is 30
It is a cement admixture characterized by having a free magnesia content of 1 to 10%, and a cement composition further containing cement and the cement admixture. The parts and% used in the present invention represent mass units.
【０００７】[0007]
【発明の実施の形態】以下、本発明を更に詳細に説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail.
【０００８】本発明のセメント混和材は、遊離石灰、遊
離マグネシア、カルシウムフェライト及び無水セッコウ
を含有してなるものであり、その割合については特に限
定されるものではないが、セメント混和材１００部中、
遊離石灰は３０〜６５部が好ましく、４０〜５５部がよ
り好ましい。遊離マグネシアは１〜１０部が好ましく、
２〜７部がより好ましい。カルシウムフェライトは５〜
４４部が好ましく、１０〜４０部がより好ましい。さら
に、無水セッコウは５〜３５部が好ましく、１０〜３０
部がより好ましい。セメント混和材中の各化合物の組成
割合が前記範囲を外れると、優れた膨張性能が得られな
い場合がある。The cement admixture of the present invention contains free lime, free magnesia, calcium ferrite and anhydrous gypsum, and the ratio is not particularly limited. ,
The free lime is preferably from 30 to 65 parts, more preferably from 40 to 55 parts. Free magnesia is preferably 1 to 10 parts,
2 to 7 parts is more preferred. Calcium ferrite
44 parts are preferable and 10 to 40 parts is more preferable. Further, the amount of anhydrous gypsum is preferably 5 to 35 parts, and 10 to 30 parts.
Parts are more preferred. If the composition ratio of each compound in the cement admixture is out of the above range, excellent expansion performance may not be obtained.
【０００９】本発明のカルシウムフェライトとは、Ｃａ
Ｏ−Ｆｅ2Ｏ3系化合物を総称するものであり、特に限定
されるものではないが、ＣａＯをＣ、Ｆｅ2Ｏ3をＦと略
記すると、Ｃ2ＦやＣＦと表せる化合物等が挙げられ
る。本発明では、膨張特性が良好となることから、Ｃ2
Ｆを使用することが好ましい。The calcium ferrite of the present invention is
It is a general term for O-Fe 2 O 3 -based compounds and is not particularly limited, but compounds that can be expressed as C 2 F or CF when CaO is abbreviated as C and Fe 2 O 3 is abbreviated as F are mentioned. . In the present invention, since the expansion characteristics are improved, C 2
It is preferred to use F.
【００１０】本発明のセメント混和材は、ＣａＯ原料、
ＭｇＯ原料、Ｆｅ2Ｏ3原料及びＣａＳＯ4原料を熱処理
して、遊離石灰、遊離マグネシア、カルシウムフェライ
ト及び無水セッコウからなるクリンカーを合成してこれ
を粉砕して製造される。遊離石灰、遊離マグネシア、カ
ルシウムフェライト及び無水セッコウを別々に合成し、
これらを混合したものでは、本発明のような効果は得ら
れない。The cement admixture of the present invention comprises a CaO raw material,
The MgO raw material, the Fe 2 O 3 raw material and the CaSO 4 raw material are heat-treated to synthesize clinker composed of free lime, free magnesia, calcium ferrite and anhydrous gypsum, and then pulverized to produce the clinker. Free lime, free magnesia, calcium ferrite and anhydrous gypsum are separately synthesized,
When these are mixed, the effect as in the present invention cannot be obtained.
【００１１】ＣａＯ原料、ＭｇＯ原料、Ｆｅ2Ｏ3原料及
びＣａＳＯ4原料を熱処理して、遊離石灰、遊離マグネ
シア、カルシウムフェライト及び無水セッコウからなる
クリンカーを合成したかどうかは、例えば、粉砕物中の
１００μｍ以上の粗粒子を顕微鏡観察(SEM-EDS)等を行
い、その粒子中に遊離石灰、遊離マグネシア、カルシウ
ムフェライト及び無水セッコウが混在していることを確
認することによって判別できる。Whether the clinker composed of free lime, free magnesia, calcium ferrite and anhydrous gypsum was synthesized by heat-treating the CaO raw material, the MgO raw material, the Fe 2 O 3 raw material, and the CaSO 4 raw material can be determined by, for example, determining whether Coarse particles of 100 μm or more can be discriminated by microscopic observation (SEM-EDS) or the like, and confirming that free lime, free magnesia, calcium ferrite, and anhydrous gypsum are mixed in the particles.
【００１２】本発明のセメント混和材を製造する際の熱
処理温度であるが、１１００〜１６００℃の範囲が好ま
しく、１２００〜１５００℃の範囲がより好ましい。１
１００℃未満では、得られたセメント混和材の膨張性能
が十分でなく、１６００℃を超えると無水セッコウが分
解する場合がある。The heat treatment temperature for producing the cement admixture of the present invention is preferably in the range of 1100 to 1600 ° C, more preferably in the range of 1200 to 1500 ° C. 1
If the temperature is lower than 100 ° C., the obtained cement admixture has insufficient expansion performance. If the temperature exceeds 1600 ° C., anhydrous gypsum may be decomposed.
【００１３】ＣａＯ原料としては、石灰石や消石灰等が
挙げられ、ＭｇＯ原料としては、ドロマイト質や炭酸マ
グネシウム、酸化マグネシウム及び水酸化マグネシウム
等が挙げられ、Ｆｅ2Ｏ3原料としては、圧延スケール、
銅カラミ、鉄粉、鋼スラッジ及び市販の酸化鉄等が挙げ
られ、ＣａＳＯ4原料としては、二水セッコウ、半水セ
ッコウ及び無水セッコウ等が挙げられる。[0013] As the CaO material, include limestone or slaked lime, etc., as the MgO raw material, dolomitic and magnesium carbonate, magnesium oxide and magnesium hydroxide and the like, and the Fe 2 O 3 raw material, the rolling scale,
Copper larch, iron powder, steel sludge, commercially available iron oxide and the like can be mentioned, and the CaSO 4 raw material includes dihydrate gypsum, hemihydrate gypsum and anhydrous gypsum.
【００１４】本発明のセメント混和材には、主成分のＣ
ａＯ、ＭｇＯ、Ｆｅ2Ｏ3、ＳＯ3の他に各種の不純物が
存在し、その具体例としては、Ａｌ2Ｏ3、ＳｉＯ2、Ｔ
ｉＯ2、Ｐ2Ｏ5、Ｎａ2Ｏ、Ｋ2Ｏ、フッ素、塩素等が挙
げられ、本発明の目的を実質的に阻害しない範囲では特
に問題とはならない。In the cement admixture of the present invention, the main component C
Various impurities exist in addition to aO, MgO, Fe 2 O 3 , and SO 3 , and specific examples thereof include Al 2 O 3 , SiO 2 , T
Examples include iO 2 , P 2 O 5 , Na 2 O, K 2 O, fluorine, chlorine and the like, which do not pose any particular problem as long as the object of the present invention is not substantially inhibited.
【００１５】本発明のセメント混和材の粒度は、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１
５００〜９０００ｃｍ2／ｇが好ましく、２５００〜４
０００ｃｍ2／ｇがより好ましい。セメント混和材の粒
度がブレーン比表面積で１５００ｃｍ2／ｇ未満では、
長期耐久性が悪くなる場合があり、９０００ｃｍ2／ｇ
を超えると充分な膨張性能が得られない場合がある。[0015] The particle size of the cement admixture of the present invention is not particularly limited, but is usually 1 in terms of Blaine specific surface area.
500-9000 cm 2 / g is preferable, and 2500-4
000 cm 2 / g is more preferred. When the particle size of the cement admixture is less than 1500 cm 2 / g in the Blaine specific surface area,
9000cm 2 / g
If it exceeds 300, sufficient expansion performance may not be obtained.
【００１６】本発明のセメント混和材の配合量は、特に
限定されるものではないが、通常、セメントとセメント
混和材からなるセメント組成物１００部中、３〜１２部
が好ましく、５〜９部がより好ましい。３部未満では、
充分な膨張性能が得られない場合があり、１２部を超え
て使用すると長期耐久性が悪くなる場合がある。The amount of the cement admixture of the present invention is not particularly limited, but is usually 3 to 12 parts, preferably 5 to 9 parts, per 100 parts of the cement composition comprising cement and the cement admixture. Is more preferred. In less than 3 parts,
Sufficient inflation performance may not be obtained, and use of more than 12 parts may deteriorate long-term durability.
【００１７】本発明のセメントとしては、普通セメン
ト、早強、超早強、低熱及び中庸熱等各種ポルトランド
セメントと、これらセメントに、高炉スラグ、フライア
ッシュ及びシリカを混合した各種混合セメント、並びに
石灰石粉末等を混合したフィラーセメント等がある。As the cement of the present invention, there are various portland cements such as ordinary cement, high-strength, ultra-high-strength, low heat and moderate heat, various cements obtained by mixing blast furnace slag, fly ash and silica with these cements, and limestone. There is a filler cement mixed with powder and the like.
【００１８】本発明では、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、収縮低減剤、高分子エマルジョン
及び凝結調整剤、並びにセメント急硬材、ベントナイト
等の粘土鉱物及び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, a water reducing agent, a high-performance water reducing agent, AE
Water reducing agents, high-performance AE water reducing agents, superplasticizers, defoamers, thickeners, rust inhibitors, antifreeze agents, shrinkage reducers, polymer emulsions and setting modifiers, and cement hardened materials, clays such as bentonite One or more of anion exchangers such as minerals and hydrotalcite can be used as long as the object of the present invention is not substantially inhibited.
【００１９】本発明では、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、予めその一部、或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、既存の如何なる
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
等が挙げられる。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. . As the mixing device, any existing device can be used, and examples thereof include a tilting mixer, an omni mixer, a Henschel mixer, a V-type mixer, and a Nauta mixer.
【００２０】[0020]
【実施例】以下、実施例により本発明を詳細に説明す
る。The present invention will be described below in detail with reference to examples.
【００２１】実施例１ ＣａＯ原料、ＭｇＯ原料、Ｆｅ2Ｏ3原料及びＣａＳＯ4
原料を配合し、混合粉砕した後、電気炉を用いて、１３
５０℃で３時間熱処理して表１に示すような組成のクリ
ンカーを合成し、ボールミルでブレーン比表面積３３０
０±２００ｃｍ 2／ｇに粉砕して、セメント混和材を調
製した。セメント混和材を粉末Ｘ線回折法で同定したと
ころ、遊離石灰、遊離マグネシア、Ｃ2Ｆ及び無水セッ
コウを含有していた。セメント混和材の化合物組成は、
化学組成を基に計算により算出した。化学組成はJIS R
5202に準じて求めた。セメントと、セメント混和材から
なるセメント組成物１００部中、セメント混和材を８部
使用し、水／セメント組成物比＝５０％、セメント組成
物／砂比＝１／３のモルタルを調製し、長さ変化率の測
定を行った。なお、比較例として、遊離石灰、遊離マグ
ネシア、Ｃ2Ｆ及び無水セッコウを別々に合成して混合
したものについて試験した（実験No.1-14）。結果を表
１に併記する。Example 1 CaO raw material, MgO raw material, FeTwoOThreeRaw materials and CaSOFour
After blending the raw materials and mixing and grinding, 13
Heat-treated at 50 ° C for 3 hours, and
And a brane specific surface area of 330
0 ± 200cm Two/ G to prepare the cement admixture
Made. The cement admixture was identified by powder X-ray diffraction.
Roller, free lime, free magnesia, CTwoF and anhydrous set
It contained ko. The compound composition of the cement admixture is
It was calculated by calculation based on the chemical composition. Chemical composition is JIS R
Determined according to 5202. From cement and cement admixture
8 parts cement admixture in 100 parts cement composition
Used, water / cement composition ratio = 50%, cement composition
Prepare a mortar with a material / sand ratio of 1/3 and measure the length change rate.
Was performed. As comparative examples, free lime and free mag
Nessia, CTwoF and anhydrous gypsum are separately synthesized and mixed
This was tested (Experiment No. 1-14). Table of results
Also described in 1.
【００２２】＜使用材料＞ ＣａＯ原料：試薬１級炭酸カルシウム。 ＭｇＯ原料：試薬１級水酸化マグネシウム。 Ｆｅ2Ｏ3原料：試薬１級酸化第二鉄。 ＣａＳＯ4原料：試薬１級二水セッコウ。 遊離石灰：ＣａＯ原料を１３５０℃で３時間熱処理して
合成。 遊離マグネシア：ＭｇＯ原料を１３５０℃で３時間熱処
理して合成。 無水セッコウ：ＣａＳＯ4原料を１３５０℃で３時間熱
処理して合成。 Ｃ2Ｆ：ＣａＯ原料２モル、Ｆｅ2Ｏ3原料１モルの割合
で配合した原料を混合粉砕した後、１３５０℃で３時間
熱処理して合成。 砂：JIS標準砂（ISO679準拠）<Materials Used> CaO raw material: reagent primary calcium carbonate. MgO raw material: reagent-grade magnesium hydroxide. Fe 2 O 3 raw material: reagent primary ferric oxide. CaSO 4 raw material: reagent grade 1 dihydrate gypsum. Free lime: synthesized by heat-treating CaO raw material at 1350 ° C for 3 hours. Free magnesia: synthesized by heat-treating MgO raw material at 1350 ° C for 3 hours. Anhydrite: synthesized by heat treating CaSO 4 raw material at 1350 ° C. for 3 hours. C 2 F: A raw material mixed at a ratio of 2 mol of CaO raw material and 1 mol of Fe 2 O 3 raw material is mixed and pulverized and then heat-treated at 1350 ° C. for 3 hours to synthesize. Sand: JIS standard sand (ISO679 compliant)
【００２３】＜測定方法＞ 長さ変化率：JIS A 6202に準じて測定。<Measurement method> Length change rate: Measured according to JIS A 6202.
【００２４】[0024]
【表１】 [Table 1]
【００２５】表１より、本発明のセメント混和材を配合
したモルタルは、比較例の遊離石灰、遊離マグネシア、
Ｃ2Ｆ及び無水セッコウを別々に合成し混合して調製し
たセメント混和材を配合したモルタルと比べ、優れた膨
張性能を示すことが判る。According to Table 1, the mortar containing the cement admixture of the present invention was obtained from the free lime, free magnesia,
It can be seen that, compared to a mortar containing a cement admixture prepared by separately synthesizing and mixing C 2 F and anhydrous gypsum, it exhibits excellent expansion performance.
【００２６】実施例２ 工業原料であるＣａＯ原料、ＭｇＯ原料、Ｆｅ2Ｏ3原料
及びＣａＳＯ4原料を配合し、ロータリーキルンを用い
て、１４００℃で焼成して表２に示すような組成のクリ
ンカーを合成し、ボールミルでブレーン比表面積３２０
０ｃｍ2／ｇに粉砕してセメント混和材を調製したこと
以外は、実施例１と同様に行った。化学組成を基に算出
した化合物組成を表３に示す。比較のため、市販の膨張
材についても長さ変化率の測定を行った。その結果を表
４に示す。Example 2 A raw material of CaO, a raw material of MgO, a raw material of Fe 2 O 3, and a raw material of CaSO 4 , which are industrial raw materials, were blended, fired at 1400 ° C. using a rotary kiln, and clinker having a composition shown in Table 2 was obtained. Synthesized and ball milled to a specific surface area of 320
The procedure was performed in the same manner as in Example 1 except that a cement admixture was prepared by pulverizing the cement admixture to 0 cm 2 / g. Table 3 shows the compound composition calculated based on the chemical composition. For comparison, the length change rate of a commercially available expandable material was also measured. Table 4 shows the results.
【００２７】＜使用材料＞ ＣａＯ原料：新潟県青海鉱山産石灰石。 ＭｇＯ原料：中国産ドロマイト。 Ｆｅ2Ｏ3原料：市販の酸化第二鉄。 ＣａＳＯ4原料：排煙脱硫二水セッコウ。 膨張材Ａ：市販カルシウムサルホアルミネート系膨張
材、ブレーン比表面積２９４０ｃｍ2／ｇ。 膨張材Ｂ：市販石灰系膨張材、ブレーン比表面積３６１
０ｃｍ2／ｇ。<Materials Used> CaO raw material: Limestone from Aomi mine, Niigata Prefecture. MgO raw material: Chinese dolomite. Fe 2 O 3 raw material: commercially available ferric oxide. CaSO 4 raw material: flue gas desulfurized dihydrate gypsum. Expansive material A: Commercial calcium sulfoaluminate-based expansive material, Blaine specific surface area 2940 cm 2 / g. Expansive material B: Commercial lime-based expansive material, Blaine specific surface area 361
0 cm 2 / g.
【００２８】[0028]
【表２】 [Table 2]
【００２９】[0029]
【表３】 [Table 3]
【００３０】[0030]
【表４】 [Table 4]
【００３１】表４より、本発明のセメント混和材を配合
したモルタルは、市販のカルシウムサルホアルミネート
系膨張材及び石灰系膨張材を配合したモルタルと比べ、
優れた膨張性能を示すことが判る。From Table 4, it can be seen that the mortar containing the cement admixture of the present invention is different from the mortar containing the commercially available calcium sulfoaluminate-based expander and lime-based expander.
It turns out that it shows excellent expansion performance.
【００３２】実施例３ 実施例２の実験No.2-1のセメント混和材を使用し、セメ
ントと、セメント混和材からなるセメント組成物１００
部中のセメント混和材の配合量を変えたこと以外は、実
施例１と同様に行った。その結果を表５に示す。Example 3 Using the cement admixture of Experiment No. 2-1 of Example 2, cement and a cement composition 100 comprising the cement admixture were used.
The procedure was performed in the same manner as in Example 1 except that the amount of the cement admixture in the parts was changed. Table 5 shows the results.
【００３３】[0033]
【表５】 [Table 5]
【００３４】表５より、本発明のセメント混和材を配合
したモルタルは、本発明のセメント混和材を配合してい
ないモルタルと比べ、優れた膨張性能を示すことが判
る。From Table 5, it can be seen that the mortar containing the cement admixture of the present invention shows superior expansion performance as compared with the mortar containing no cement admixture of the present invention.
【００３５】[0035]
【発明の効果】本発明のセメント混和材を使用すること
により、優れた膨張性能を有するセメント組成物が得ら
れる。By using the cement admixture of the present invention, a cement composition having excellent expansion performance can be obtained.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 光男 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 MA00 MA02 MB06 MB11 MB23 PA01 PB01 PB03 PB08 PB11 PC11 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mitsuo Takahashi 2209 Aomi, Aomi-cho, Nishikubiki-gun, Niigata F-term in the Aomi Plant of Denki Kagaku Kogyo Co., Ltd. 4G012 MA00 MA02 MB06 MB11 MB23 PA01 PB01 PB03 PB08 PB11 PC11
Claims (3)
及びＣａＳＯ4原料を熱処理して得られる物質であっ
て、遊離石灰、遊離マグネシア、カルシウムフェライト
及び無水セッコウを含有してなるセメント混和材。1. A cement admixture obtained by heat-treating a CaO raw material, a MgO raw material, an Fe 2 O 3 raw material and a CaSO 4 raw material, the cement admixture containing free lime, free magnesia, calcium ferrite and anhydrous gypsum .
グネシア含有率が１〜１０％であることを特徴とする請
求項１に記載のセメント混和材。2. The cement admixture according to claim 1, wherein the free lime content is 30 to 65% and the free magnesia content is 1 to 10%.
メント混和材とを含有してなるセメント組成物。3. A cement composition comprising a cement and the cement admixture according to claim 1 or 2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104671687A (en) * | 2015-01-23 | 2015-06-03 | 湖州丰盛新材料有限公司 | Concrete expansive agent and preparation method thereof |
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| JPS4981434A (en) * | 1972-12-08 | 1974-08-06 | ||
| JPS5237926A (en) * | 1975-06-12 | 1977-03-24 | Gen Pootorando Inc | Improved extensible cement |
| JP2000233959A (en) * | 1999-02-10 | 2000-08-29 | Taiheiyo Cement Corp | Clinker ground material, high-early-strength cement composition containing the same, concrete and concrete product |
| JP2001163651A (en) * | 1999-12-07 | 2001-06-19 | Denki Kagaku Kogyo Kk | Grouting cement admixture and cement composition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4855215A (en) * | 1971-11-13 | 1973-08-03 | ||
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| JPS5237926A (en) * | 1975-06-12 | 1977-03-24 | Gen Pootorando Inc | Improved extensible cement |
| JP2000233959A (en) * | 1999-02-10 | 2000-08-29 | Taiheiyo Cement Corp | Clinker ground material, high-early-strength cement composition containing the same, concrete and concrete product |
| JP2001163651A (en) * | 1999-12-07 | 2001-06-19 | Denki Kagaku Kogyo Kk | Grouting cement admixture and cement composition |
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| CN104671687A (en) * | 2015-01-23 | 2015-06-03 | 湖州丰盛新材料有限公司 | Concrete expansive agent and preparation method thereof |
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