JP2002029797A - Cement admixture and cement composition - Google Patents
Cement admixture and cement compositionInfo
- Publication number
- JP2002029797A JP2002029797A JP2000218420A JP2000218420A JP2002029797A JP 2002029797 A JP2002029797 A JP 2002029797A JP 2000218420 A JP2000218420 A JP 2000218420A JP 2000218420 A JP2000218420 A JP 2000218420A JP 2002029797 A JP2002029797 A JP 2002029797A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- raw material
- cement admixture
- free lime
- admixture
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0042—Powdery mixtures
-
- 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
- C04B22/008—Cement and like inorganic materials added as expanding or shrinkage compensating ingredients in mortar or concrete compositions, the expansion being the result of a recrystallisation
-
- 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
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-anhydrite-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。遊離石灰含有量を高めることによって、膨張性能に
優れる膨張材とすることも可能であるが、単に遊離石灰
含有量を高めて膨張性能を向上した場合には、耐風化性
が著しく低下し、貯蔵期間中に性能低下を起こすため、
品質の安定した膨張材とはならないものであった。[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. By increasing the free lime content, it is possible to obtain an expandable material having excellent expansion performance.However, simply increasing the free lime content to improve the expansion performance significantly reduces the weathering resistance and causes To cause performance degradation during the period,
The expanded material did not become stable in quality.
【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、特定の組成を持つ、遊離石灰
−アウイン−カルシウムシリケート−無水セッコウ系セ
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, by using a free lime-auyne-calcium silicate-anhydrite gypsum-based cement admixture having a specific composition, The inventors have found that the above-mentioned problems can be solved, and have completed the present invention.
【０００６】[0006]
【課題を解決するための手段】即ち、本発明は、ＣａＯ
原料、Ａｌ2Ｏ3原料、ＳｉＯ2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、アウイ
ン、カルシウムシリケー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、遊離石灰含有量が３０〜７
０％である該セメント混和材であり、ＳｉＯ2含有量が
１％を超え６％未満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, an Al 2 O 3 raw material, a SiO 2 raw material and a CaSO 4 raw material, which is a cement admixture containing free lime, auin, calcium silicate and anhydrous gypsum, and containing free lime. The quantity is 30-7
0% of the cement admixture, wherein the content of SiO 2 is more than 1% and less than 6%, further comprising cement and the cement admixture. A cement composition. 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、ＣａＯ原料、
Ａｌ2Ｏ3原料、ＳｉＯ2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、アウイン、カル
シウムシリケート及び無水セッコウを含有してなるもの
である。更に遊離石灰含有量が３０〜７０％であること
が好ましい。遊離石灰含有量が３０％未満では優れた膨
張性能が得られない場合があり、７０％を超えると風化
が著しくなり好ましくない。また、ＳｉＯ2含有量が１
％を超え６％未満であるものが特に優れた膨張性能を示
す。ＳｉＯ2含有量が１％以下では風化が著しく、６％
以上では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 comprises a CaO raw material,
A substance obtained by heat-treating an Al 2 O 3 raw material, a SiO 2 raw material and a CaSO 4 raw material, which contains free lime, aauin, calcium silicate and anhydrous gypsum. Further, the content of free lime is preferably 30 to 70%. If the free lime content is less than 30%, excellent expansion performance may not be obtained, and if it exceeds 70%, weathering becomes remarkable, which is not preferable. Further, when the SiO 2 content is 1
% And less than 6% show particularly excellent expansion performance. When the SiO 2 content is 1% or less, the weathering is remarkable, and 6%
Above, excellent expansion performance may not be obtained.
【０００９】本発明のセメント混和材１００部中、遊離
石灰は３０〜７０部が好ましく、４０〜６０部がより好
ましい。アウインは５〜２２．５部が好ましく、７．５
〜１７．５部がより好ましい。カルシウムシリケートは
５〜２２．５部が好ましく、７．５〜１７．５部がより
好ましい。さらに、無水セッコウは１６〜３０部が好ま
しく、２０〜２５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。[0009] In 100 parts of the cement admixture of the present invention, the amount of free lime is preferably 30 to 70 parts, more preferably 40 to 60 parts. 5 to 22.5 parts of the outer is preferable, and 7.5 is preferable.
１７17.5 parts is more preferred. The calcium silicate content is preferably from 5 to 22.5 parts, more preferably from 7.5 to 17.5 parts. Further, the amount of anhydrous gypsum is preferably 16 to 30 parts, more preferably 20 to 25 parts. If the composition ratio of each compound in the cement admixture is out of the above range, excellent expansion performance may not be obtained.
【００１０】本発明のアウインとは３ＣａＯ・３Ａｌ2
Ｏ3・ＣａＳＯ4で表せる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。本発明のカルシウムシリ
ケートとは、ＣａＯ−ＳｉＯ2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、一般に、Ｃａ
ＯをＣ、ＳｉＯ2をＳと略記すると、Ｃ3ＳやＣ2Ｓ、さ
らにはＣ2Ｓ・ＣａＳＯ4等の化合物が知られている。In the present invention, 3CaO.3Al 2
A generic term for compounds represented by O 3 .CaSO 4
There is no particular limitation. The calcium silicate of the present invention is a general term for CaO—SiO 2 -based compounds, and is not particularly limited.
The O C, when the SiO 2 is abbreviated as S, C 3 S and C 2 S, more is known compounds such as C 2 S · CaSO 4.
【００１１】本発明のセメント混和材は、ＣａＯ原料、
Ａｌ2Ｏ3原料、ＳｉＯ2原料及びＣａＳＯ4原料を熱処理
して、遊離石灰、アウイン、カルシウムシリケート及び
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
して製造することが必要である。遊離石灰、アウイン、
カルシウムシリケー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。例えば、ＣａＯ原料、Ａｌ2Ｏ3原料及びＣ
ａＳＯ4原料を熱処理して、遊離石灰とアウインからな
るクリンカーを合成して、これにカルシウムシリケート
と無水セッコウを混合して製造した場合や、ＣａＯ原
料、Ａｌ2Ｏ3原料、ＣａＳＯ4原料及びＳｉＯ2原料を熱
処理して、遊離石灰、アウイン、カルシウムシリケート
からなるクリンカーを合成して、これに無水セッコウを
混合して製造した場合等には、本発明の効果は得られな
い。[0011] The cement admixture of the present invention comprises a CaO raw material,
It is necessary to heat-treat the Al 2 O 3 raw material, the SiO 2 raw material and the CaSO 4 raw material to synthesize clinker composed of free lime, auin, calcium silicate and anhydrous gypsum, and pulverize and produce it. Free lime, auin,
In the case where calcium silicate and anhydrous gypsum are separately synthesized and mixed, the effect as in the present invention cannot be obtained. For example, CaO raw material, Al 2 O 3 raw material and C
The aSO 4 raw material is heat-treated to synthesize a clinker composed of free lime and eauin, and then mixed with calcium silicate and anhydrous gypsum to produce a clinker, a CaO raw material, an Al 2 O 3 raw material, a CaSO 4 raw material and a SiO 2 raw material. (2) The effects of the present invention cannot be obtained in the case where clinker composed of free lime, eauin, and calcium silicate is synthesized by heat-treating the raw materials and mixed with anhydrous gypsum.
【００１２】ＣａＯ原料、Ａｌ2Ｏ3原料、ＳｉＯ2原料
及びＣａＳＯ4原料を熱処理して、遊離石灰、アウイ
ン、カルシウムシリケー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１
００μｍ以上の粗粒子を顕微鏡観察(SEM-EDS)等で組成
分析を行い、その粒子中に遊離石灰、アウイン、カルシ
ウムシリケー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, eauin, calcium silicate and anhydrous gypsum was synthesized by heat-treating the CaO raw material, the Al 2 O 3 raw material, the SiO 2 raw material and the CaSO 4 raw material can be determined by, for example, 1
The composition can be determined by analyzing the composition of coarse particles of 00 μm or more by microscopic observation (SEM-EDS) or the like, and confirming that free lime, auyne, calcium silicate, and anhydrous gypsum are mixed in the particles.
【００１３】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、１２００〜１６００℃の範囲が好ま
しく、１２５０〜１５００℃の範囲がより好ましい。１
２００℃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 1200 to 1600 ° C, more preferably in the range of 1250 to 1500 ° C. 1
If the temperature is lower than 200 ° C., the expansion performance of the obtained cement admixture is not sufficient. If the temperature exceeds 1600 ° C., anhydrous gypsum may be decomposed.
【００１４】ＣａＯ原料としては、石灰石や消石灰等が
挙げられ、Ａｌ2Ｏ3原料としては、ボーキサイトやアル
ミ残灰等が挙げられ、ＳｉＯ2原料としては、粘土質や
珪石が挙げられ、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。[0014] As the CaO material, include limestone or slaked lime, etc., as the Al 2 O 3 raw material, include bauxite, aluminum residual ash, etc., as the SiO 2 raw material include clay and silica, CaSO 4 Raw materials include dihydrate gypsum, hemihydrate gypsum and anhydrous gypsum.
【００１５】本発明のセメント混和材には、主成分のＣ
ａＯ、Ａｌ2Ｏ3、ＳｉＯ2、ＳＯ3の他に各種の不純物が
存在し、その具体例としては、Ｆｅ2Ｏ3、ＭｇＯ、Ｔｉ
Ｏ2、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, Al 2 O 3 , SiO 2 , and SO 3 , and specific examples thereof include Fe 2 O 3 , MgO, and Ti.
Examples include O 2 , P 2 O 5 , Na 2 O, K 2 O, fluorine, chlorine and the like, which are not particularly problematic as long as the object of the present invention is not substantially inhibited.
【００１６】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。The particle size of the cement admixture of the present invention is not particularly limited.
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.
【００１７】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
て使用すると過膨張となり硬化体にクラックを生じる場
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 the cement and the cement admixture. Is more preferred. In less than 3 parts,
In some cases, sufficient expansion performance cannot be obtained, and when used in an amount exceeding 12 parts, overexpansion may occur and cracks may occur in the cured product.
【００１８】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.
【００１９】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.
【００２０】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 a part 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.
【００２１】[0021]
【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.
【００２２】実施例１ ＣａＯ原料、Ａｌ2Ｏ3原料、ＳｉＯ2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３５０
０±３００ｃｍ 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、アウイン、カルシウムシリケート及び
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。セメント混和材の風化抵
抗性を促進風化試験によって評価した。比較のため、市
販の膨張材についても同様に評価した。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７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。結果を表１に併記す
る。Example 1 CaO raw material, AlTwoOThreeRaw material, SiOTwoRaw 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 350
0 ± 300cm Two/ G to prepare the cement admixture
Made. The cement admixture was identified by powder X-ray diffraction.
Rollers, free lime, eauin, calcium silicate and
It contained anhydrous gypsum. Compound of cement admixture
The composition was calculated by calculation based on the chemical composition. Chemical composition
Was determined according to JIS R 5202. Weathering of cement admixture
The resistance was evaluated by an accelerated weathering test. City for comparison
Similarly, the intumescent material sold was evaluated. Cement and
100 parts cement composition consisting of cement admixture
Using 7 parts of cement admixture, water / cement composition ratio = 50
%, Mortar with cement composition / sand ratio = 1/3
Then, the length change rate was measured. The results are shown in Table 1.
You.
【００２３】＜使用材料＞ ＣａＯ原料：試薬１級炭酸カルシウム。 Ａｌ2Ｏ3原料：試薬１級酸化アルミニウム。 ＳｉＯ2原料：試薬１級二酸化ケイ素。 ＣａＳＯ4原料：試薬１級二水セッコウ。 砂：JIS標準砂（ISO679準拠）。 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。<Materials Used> CaO raw material: reagent primary calcium carbonate. Al 2 O 3 raw material: reagent primary grade aluminum oxide. SiO 2 raw material: reagent primary silicon dioxide. CaSO 4 raw material: reagent grade 1 dihydrate gypsum. Sand: JIS standard sand (ISO679 compliant). Expansive material A: Commercial calcium sulfoaluminate-based expansive material, Blaine specific surface area 2940 cm 2 / g.
【００２４】＜測定方法＞ 長さ変化率：JIS A 6202に準じて測定。材齢７日の長さ
変化率を表示。 促進風化試験：セメント混和材３ｇをスチロール瓶に入
れ、２０℃・相対湿度７０％の環境試験室内で暴露放置
し、材齢３日後に回収して１０００℃で３０分間強熱し
た際の減量を測定して評価した。<Measurement method> Length change rate: Measured according to JIS A 6202. The length change rate of 7 days old is displayed. Accelerated weathering test: 3 g of cement admixture was placed in a styrene bottle, left to stand in an environmental test room at 20 ° C. and 70% relative humidity, and collected after 3 days of age to determine the weight loss when ignited at 1000 ° C. for 30 minutes. It was measured and evaluated.
【００２５】[0025]
【表１】 [Table 1]
【００２６】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、比較例のモルタルと比べ、優れた膨張
性能と風化抵抗性を示すことが判る。From Table 1, it can be seen that the mortar containing the cement admixture of the present invention shows superior expansion performance and weathering resistance as compared with the mortar of the comparative example.
【００２７】実施例２ 工業原料であるＣａＯ原料、Ａｌ2Ｏ3原料、ＳｉＯ2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３１
００ｃｍ2／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 An industrial raw material, CaO raw material, Al 2 O 3 raw material, SiO 2 raw material and CaSO 4 raw material were blended, fired at 1400 ° C. using a rotary kiln, and clinker having a composition shown in Table 2 Is synthesized with a ball mill to obtain a Blaine specific surface area of 31.
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 00 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.
【００２８】＜使用材料＞ ＣａＯ原料：新潟県青海鉱山産石灰石。 Ａｌ2Ｏ3原料：中国産のボーキサイト。 ＳｉＯ2原料：珪石。 ＣａＳＯ4原料：排煙脱硫二水セッコウ。 膨張材Ｂ：市販石灰系膨張材、ブレーン比表面積３６１
０ｃｍ2／ｇ。<Materials> CaO raw material: Limestone from Aomi mine, Niigata Prefecture. Al 2 O 3 raw material: Chinese bauxite. SiO 2 raw material: silica stone. CaSO 4 raw material: flue gas desulfurized dihydrate gypsum. Expansive material B: Commercial lime-based expansive material, Blaine specific surface area 361
0 cm 2 / g.
【００２９】[0029]
【表２】 [Table 2]
【００３０】[0030]
【表３】 [Table 3]
【００３１】[0031]
【表４】 [Table 4]
【００３２】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 shows superior expansion performance as compared with a mortar containing a commercially available expansion material.
【００３３】実施例３ 実施例１の実験No.1-8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. 1-8 of Example 1, cement and a cement composition 100 comprising the cement admixture
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.
【００３４】[0034]
【表５】 [Table 5]
【００３５】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、配合量が増加するにつれ長さ変化率が
大きくなる、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 exhibits an excellent expansion performance in which the rate of change in length increases as the blending amount increases.
【００３６】[0036]
【発明の効果】本発明により、従来の膨張材と比べ、膨
張性能と風化抵抗性に優れるセメント混和材が得られ
る。According to the present invention, a cement admixture excellent in expansion performance and weathering resistance can be obtained as compared with conventional expansion materials.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） // Ｃ０４Ｂ 103:60 Ｃ０４Ｂ 103:60 (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 MA01 MB06 MB23 MB33 PB03 PB04 PB06 PB08 PB11 PB12 PC09 PC13 PC14 PD02──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) // C04B 103: 60 C04B 103: 60 (72) Inventor Mitsuo Takahashi 2209 Aomi, Aomi-cho, Aomi-cho, Nishikubiki-gun, Niigata F-term (reference) in Aomi Plant of Denki Kagaku Kogyo Co., Ltd. 4G012 MA00 MA01 MB06 MB23 MB33 PB03 PB04 PB06 PB08 PB11 PB12 PC09 PC13 PC14 PD02
Claims (4)
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、アウイン、カルシウムシリケート及び無
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, an Al 2 O 3 raw material, a SiO 2 raw material and a CaSO 4 raw material, the cement admixture containing free lime, auyne, calcium silicate and anhydrous gypsum .
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 70%.
あることを特徴とする請求項１又は２に記載のセメント
混和材。3. The cement admixture according to claim 1, wherein the content of SiO 2 is more than 1% and less than 6%.
記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 a cement and the cement admixture according to claim 1.
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| JP2000218420A JP4498555B2 (en) | 2000-07-19 | 2000-07-19 | Cement admixture and cement composition |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002226243A (en) * | 2001-01-29 | 2002-08-14 | Denki Kagaku Kogyo Kk | Expansive admixture and cement composition |
| WO2012169005A1 (en) * | 2011-06-07 | 2012-12-13 | 電気化学工業株式会社 | Process for producing expanding-material clinker |
| TWI582056B (en) * | 2011-11-21 | 2017-05-11 | Denki Kagaku Kogyo Kk | Ultra fast hard clinker, cement composition using the clinker, and a method for producing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518210A (en) * | 1978-07-24 | 1980-02-08 | Nippon Cement Co Ltd | Sludge solidification treating agent |
-
2000
- 2000-07-19 JP JP2000218420A patent/JP4498555B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518210A (en) * | 1978-07-24 | 1980-02-08 | Nippon Cement Co Ltd | Sludge solidification treating agent |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002226243A (en) * | 2001-01-29 | 2002-08-14 | Denki Kagaku Kogyo Kk | Expansive admixture and cement composition |
| JP4567211B2 (en) * | 2001-01-29 | 2010-10-20 | 電気化学工業株式会社 | Expandable material and cement composition |
| WO2012169005A1 (en) * | 2011-06-07 | 2012-12-13 | 電気化学工業株式会社 | Process for producing expanding-material clinker |
| TWI582056B (en) * | 2011-11-21 | 2017-05-11 | Denki Kagaku Kogyo Kk | Ultra fast hard clinker, cement composition using the clinker, and a method for producing the same |
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