JPH06199547A - High strength cement composition - Google Patents
High strength cement compositionInfo
- Publication number
- JPH06199547A JPH06199547A JP35883792A JP35883792A JPH06199547A JP H06199547 A JPH06199547 A JP H06199547A JP 35883792 A JP35883792 A JP 35883792A JP 35883792 A JP35883792 A JP 35883792A JP H06199547 A JPH06199547 A JP H06199547A
- Authority
- JP
- Japan
- Prior art keywords
- fine powder
- cement
- high strength
- strength
- particle size
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高強度セメント組成物
に関し、特に水／セメント比を低減させても流動性がよ
く、且つ初期及び長期高強度を発現するセメント組成物
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength cement composition, and more particularly to a cement composition having good fluidity even when the water / cement ratio is reduced and exhibiting high strength in the initial and long term.
【０００２】[0002]
【従来の技術】従来、セメント全体に、水蒸気を接触さ
せたり、スプレーにより散水を行って、０．１〜５重量
％の水を均質に吸収させて部分的に水和させた部分水和
セメントに、高性能減水剤を添加してなるモルタル又は
コンクリートは、部分水和させていない元のセメントに
高性能減水剤を添加してなるモルタル又はコンクリート
より、流動性が向上することが知られている（特開昭６
２−１６２５０６号公報）。2. Description of the Related Art Conventionally, partially hydrated cement in which water vapor is sprayed or sprayed on the entire cement to uniformly absorb 0.1 to 5% by weight of water to partially hydrate the cement. In addition, it is known that mortar or concrete obtained by adding a high-performance water reducing agent has higher fluidity than mortar or concrete obtained by adding a high-performance water reducing agent to original cement that has not been partially hydrated. (JP-A-6
No. 2 162506).
【０００３】また、微粉砕した不活性もしくは低活性の
石灰石やスラグを添加したセメントに、高性能減水剤を
添加してなるモルタル又はコンクリートは、前記石灰石
やスラグを未添加の元のセメントに高性能減水剤を添加
してなるモルタルやコンクリートより、流動性が向上す
ることも知られている。In addition, mortar or concrete obtained by adding a high-performance water-reducing agent to a cement to which finely ground inert or low-active limestone or slag is added is higher than the original cement to which the limestone or slag has not been added. It is also known that fluidity is improved as compared with mortar and concrete to which a performance reducing agent is added.
【０００４】これらの従来法による、部分水和セメント
を用いるモルタルやコンクリート、又は微粉砕した不活
性もしくは低活性の石灰石やスラグを添加したセメント
を用いるモルタルやコンクリートでは、前記のように流
動性が改善され、しかも流動性を一定にした場合、水／
セメント比を数％低減させることができる。Mortars and concretes using partially hydrated cements or mortars and concretes using finely ground inert or low activity limestone and cements added with slag by these conventional methods have the above-mentioned fluidity. If it is improved and the fluidity is kept constant, water /
The cement ratio can be reduced by several percent.
【０００５】一方、高強度セメント硬化体を製造するに
は、配合の水／セメント比を低減させることが一般に行
われている。On the other hand, in order to produce a high strength cement hardened product, it is generally practiced to reduce the water / cement ratio of the mixture.
【０００６】しかしながら、前記従来法によるモルタル
やコンクリートを使用する場合には、水／セメント比が
数％低下するにもかかわらず、硬化体の強度発現性、特
に初期における強度発現性が極めて低く、このため、高
強度の硬化体を得るためには配合中の単位セメント量を
増加させることになり、これが硬化体の乾燥収縮や温度
応力の発生原因となり、クラックの発生につながり、コ
ンクリートの耐久性上問題となっている。However, when the mortar or concrete produced by the conventional method is used, the strength of the cured product, particularly the strength at the initial stage, is extremely low, even though the water / cement ratio is reduced by several percent. Therefore, in order to obtain a high-strength hardened product, the amount of unit cement in the mix must be increased, which causes the dry shrinkage and temperature stress of the hardened product, which leads to the occurrence of cracks and the durability of concrete. It is a problem above.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、前記従来技
術の有する問題を解決して、水／セメント比を低減させ
ても流動性がよく、且つ初期高強度を発現するのみなら
ず、長期高強度をも発現することのできる高強度セメン
ト組成物を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention solves the problems of the above-mentioned prior art so that the fluidity is good even when the water / cement ratio is reduced, and not only the initial high strength is exhibited, but also the long-term It is an object of the present invention to provide a high-strength cement composition capable of expressing high strength.
【０００８】[0008]
【課題を解決するための手段】本発明の高強度セメント
組成物は、ポルトランドセメントを、最大粒径５〜１５
μｍの微粉と、１５μｍを越える粒径の粗粉とに分級
し、該微粉を炭酸ガス及び水蒸気に接触させて強熱減量
を０．１〜５．０重量％増加させた後、前記粗粉と混合
してなる。The high-strength cement composition of the present invention comprises Portland cement with a maximum particle size of 5-15.
The fine powder having a particle size of more than 15 μm and a coarse powder having a particle size of more than 15 μm are classified, and the fine powder is brought into contact with carbon dioxide gas and steam to increase the loss on ignition by 0.1 to 5.0% by weight. It is mixed with.
【０００９】本発明に用いられるポルトランドセメント
としては、ＪＩＳ規格に適合する普通ポルトランドセメ
ント、早強ポルトランドセメント、中庸熱ポルトランド
セメント、耐硫酸塩ポルトランドセメント等、更にこれ
らのポルトランドセメントに高炉スラグ粉末、フライア
ッシュ、珪石粉、シリカフューム等のセメント混和材
を、１種又は２種以上混合して得られる混合セメント等
が挙げられる。Examples of the Portland cement used in the present invention include ordinary Portland cement conforming to JIS standard, early strength Portland cement, moderate heat Portland cement, sulfate resistant Portland cement, and the like. Examples include mixed cements obtained by mixing one or more cement admixtures such as ash, silica stone powder, and silica fume.
【００１０】本発明の高強度セメント組成物を製造する
に際しては、先ず、前記ポルトランドセメントを慣用の
分級機を用いて微粉と粗粉とに分級する。In producing the high-strength cement composition of the present invention, first, the Portland cement is classified into a fine powder and a coarse powder by using a conventional classifier.
【００１１】この際、微粉の最大粒径は５〜１５μｍ、
好ましくは８〜１２μｍであり、この微粉の最大粒径が
５μｍ未満又は１５μｍを越える場合には、いずれも強
度増進が少ない。At this time, the maximum particle size of the fine powder is 5 to 15 μm,
It is preferably from 8 to 12 μm, and when the maximum particle size of the fine powder is less than 5 μm or more than 15 μm, strength enhancement is small in all cases.
【００１２】また、１５μｍを越える粒径のものは粗粉
として分級する。Particles having a particle size exceeding 15 μm are classified as coarse powder.
【００１３】分級に際し用いられる分級機としては、例
えばスターテバンド型セパレーター、サイクロン型セパ
レーター、ターボクラシファイヤー等の、粉体の分級に
慣用されているものが挙げられる。Examples of classifiers used for classification include those commonly used for classifying powders, such as starter band type separators, cyclone type separators and turbo classifiers.
【００１４】これらの慣用分級機を用いてポルトランド
セメントを分級する場合、目標とする最大粒径で完全に
分級されるわけではなく、通常、前記微粉部分には目標
とする分級粒径を越える粗粉が含まれており、一方、前
記粗粉部分にも目標とする分級粒径未満の微粉が含まれ
ている。When classifying Portland cement using these conventional classifiers, it is not possible to completely classify at a target maximum particle size, and usually, in the fine powder portion, a coarse particle size exceeding a target classifying particle size is used. On the other hand, the coarse powder portion also contains fine powder having a particle size smaller than the target classification particle size.
【００１５】本発明においては、最大粒径５〜１５μｍ
の微粉の５〜５０重量％が、前記微粉中に分級されてい
ることが好ましい。In the present invention, the maximum particle size is 5 to 15 μm.
It is preferable that 5 to 50% by weight of the fine powder is classified in the fine powder.
【００１６】次いで、このように分級して得られる微粉
を、炭酸ガス及び水蒸気に接触させて強熱減量増加を
０．１〜５．０重量％とした炭酸化微粉とする。Then, the fine powder thus obtained by classification is brought into contact with carbon dioxide gas and steam to obtain carbonated fine powder having an increase in ignition loss of 0.1 to 5.0% by weight.
【００１７】即ち、前記微粉を慣用の装置を利用して炭
酸化し、該微粉表面を部分的に炭酸化させる。That is, the fine powder is carbonized using a conventional apparatus, and the surface of the fine powder is partially carbonated.
【００１８】セメント鉱物の炭酸化は相対湿度で約５０
％以上の水蒸気が存在しないと迅速に進行せず、炭酸化
に時間がかかり、効率的でなく、また、炭酸化温度は高
温であることが好ましい。Carbonation of cement minerals is about 50 at relative humidity.
% Of water vapor does not proceed rapidly, carbonation takes time, is not efficient, and the carbonation temperature is preferably high.
【００１９】本発明において炭酸化は、微粉を高速で攪
拌しながら、又は浮遊状態において、水蒸気を含んだ炭
酸ガスを吹き付け、均一に微粉が炭酸化されるように行
なわれる。In the present invention, carbonation is carried out while stirring the fine powder at a high speed or in a suspended state so that carbon dioxide gas containing water vapor is sprayed to uniformly carbonize the fine powder.
【００２０】炭酸化は、炭酸化前後の微粉の強熱減量の
増加が、０．１〜５．０重量％、好ましくは１．０〜
３．０重量％となるまで行なわれる。In carbonation, the increase in ignition loss of fine powder before and after carbonation is 0.1 to 5.0% by weight, preferably 1.0 to
It is performed until it reaches 3.0% by weight.
【００２１】更に、このように炭酸化して得られる炭酸
化微粉と、当初に分級された前記粗粉とを、慣用の混合
機で十分に均質になるように混合することにより、本発
明の高強度セメント組成物が得られる。Further, by mixing the carbonated fine powder obtained by the carbonation in this way with the coarse powder initially classified so as to be sufficiently homogenous in a conventional mixer, the high powder of the present invention can be obtained. A strong cement composition is obtained.
【００２２】[0022]
【作用】本発明の高強度セメント組成物を用いて得られ
るモルタルやコンクリート硬化体は、長期材令において
のみならず、初期材令においても格段に優れた高強度を
発現する。The mortar and hardened concrete obtained by using the high-strength cement composition of the present invention exhibit remarkably excellent high strength not only in long-term age but also in early age.
【００２３】本発明において分級した微粉は元々セメン
トの一部であり、粉末度が高く、且つ高活性の珪酸３カ
ルシウム、アルミン酸３カルシウム、アルミン酸鉄４カ
ルシウムが多く含まれており、主に、この微粉の水和に
より、モルタルやコンクリートの流動性が時間の経過と
共に低下していく。The fine powder classified in the present invention is originally a part of cement, and contains a large amount of highly active and highly active tricalcium silicate, tricalcium aluminate, and tetracalcium iron aluminate. Due to the hydration of this fine powder, the fluidity of mortar and concrete decreases over time.
【００２４】そこで、本発明においては、該微粉を炭酸
化して炭酸化微粉としている。この炭酸化微粉は、前記
炭酸化によりその表面を部分的に炭酸化したものであ
り、その核はセメントのクリンカーであるが、その表面
のみが不活性な炭酸カルシウムに覆われている。Therefore, in the present invention, the fine powder is carbonated to be carbonated fine powder. This carbonated fine powder is one whose surface has been partially carbonated by the above-mentioned carbonation, and its core is the clinker of cement, but only its surface is covered with inactive calcium carbonate.
【００２５】即ち、本発明のセメント組成物において
は、この炭酸カルシウム被覆により、モルタルやコンク
リートの初期の流動性を向上させ、同一流動性を得るた
めの混練水量を低減させ、また、長期材令においては、
炭酸カルシウムに覆われた核のクリンカーが水和するこ
とにより、長期の強度発現性も良好となる。That is, in the cement composition of the present invention, this calcium carbonate coating improves the initial fluidity of mortar and concrete, reduces the amount of kneading water for obtaining the same fluidity, and also long-term age. In
By hydrating the nucleus clinker covered with calcium carbonate, the long-term strength development is also improved.
【００２６】以下、本発明を実施例により詳細に説明す
る。The present invention will be described in detail below with reference to examples.
【００２７】[0027]
実施例１〜５及び比較例１〜４ Examples 1-5 and Comparative Examples 1-4
【００２８】セメント組成物の調製 普通ポルトランドセメント（住友セメント（株）製、強
熱減量１．０％）を、ターボクラシファイアー（日清エ
ンジニアリング社製 ＴＣ−１５Ｎ）を用いて、４種類
（最大粒径５、１０、１５及び２０μｍ）の微粉と粗粉
とに分級した。各微粉の最大粒径を表１に示す。Preparation of Cement Composition Ordinary Portland cement (manufactured by Sumitomo Cement Co., Ltd., loss on ignition of 1.0%) was used with a turbo classifier (TC-15N manufactured by Nisshin Engineering Co., Ltd.) in four types (maximum). The powder was classified into fine powder and coarse powder having a particle size of 5, 10, 15 and 20 μm). The maximum particle size of each fine powder is shown in Table 1.
【００２９】分級した各微粉を流動層混合機中に入れ、
流動媒体として純炭酸ガス及び水蒸気を用いて炭酸化さ
せた。この際、水蒸気及び炭酸ガスによる流動層中での
炭酸化時間を適宜増減させ、表１に示すような強熱減量
の増加した各炭酸化微粉を得た。Put each classified fine powder into a fluidized bed mixer,
Carbonation was carried out using pure carbon dioxide and steam as the fluidizing medium. At this time, the carbonation time in the fluidized bed with water vapor and carbon dioxide was appropriately increased or decreased to obtain each carbonation fine powder with increased ignition loss as shown in Table 1.
【００３０】このようにして得られる各炭酸化微粉と、
当初に分級された、対応する前記粗粉とを、それぞれＶ
型混合機で十分に混合し、本発明の各高強度セメント組
成物を得た。Each carbonated fine powder thus obtained,
The corresponding coarse powder that was initially classified was
The mixture was thoroughly mixed with a mold mixer to obtain each high-strength cement composition of the present invention.
【００３１】比較のため、原料である普通ポルトランド
セメントのみを使用する元セメント（比較例１）、粗粉
に、最大粒径１０μｍで分級した微粉と同量の微粉末石
灰石粉（粉末度１５０００ｃｍ2 ／ｇ）を混合したセメ
ント組成物（比較例２）、強熱減量増加が本発明の範囲
を越える炭酸化微粉を混合したセメント組成物（比較例
３）及び最大粒径が本発明の範囲を越える微粉を使用し
たセメント組成物（比較例４）を得た。For comparison, the original cement (comparative example 1) using only the normal Portland cement as the raw material, the coarse powder, and the same amount of fine limestone powder as the fine powder classified with the maximum particle size of 10 μm (fineness 15,000 cm 2 / G) mixed cement composition (Comparative Example 2), a cement composition mixed with carbonated fine powder whose ignition loss increase exceeds the range of the present invention (Comparative Example 3), and the maximum particle size is within the range of the present invention. A cement composition (comparative example 4) using fine powder exceeding the limit was obtained.
【００３２】モルタルの製造及び強度測定 で得られる各セメント組成物を用いて、セメント：砂
＝１：３、βナフタレンスルホン酸ホルマリン縮合物系
高性能減水剤（花王社製マイティ１５０、固形分４０重
量％）を該セメント組成物に対して１．２重量％添加し
た配合で、モルタルフロー値が２００±２ｍｍになるよ
うに混練水量を変化させて、モルタル混練物を得た。Using each cement composition obtained in the production and strength measurement of mortar, cement: sand = 1: 3, β-naphthalenesulfonic acid formalin condensate high-performance water reducing agent (Mighty 150 manufactured by Kao Corporation, solid content 40 (Wt%) was added to the cement composition in an amount of 1.2 wt%, and the amount of kneading water was changed so that the mortar flow value was 200 ± 2 mm to obtain a mortar kneaded product.
【００３３】この際使用した砂は、豊浦標準砂（粒径
０．１０〜０．３０ｍｍ）、４号砂（粒径０．４２〜
１．６８ｍｍ）、３号砂（粒径０．８４〜２．３８ｍ
ｍ）を等重量で混合したものである。The sand used at this time was Toyoura standard sand (particle size 0.10 to 0.30 mm), No. 4 sand (particle size 0.42 to 0.42).
1.68 mm) No. 3 sand (particle size 0.84 to 2.38 m)
m) is mixed in equal weight.
【００３４】このようにして得られるモルタル混練物を
４×４×１６ｃｍに成形し、２４時間、２０℃、９０％
ＲＨの湿空養生し、脱型した後、所定材令まで２０℃の
水中養生を行って、強度測定用供試体を得た。The mortar-kneaded product thus obtained was molded into 4 × 4 × 16 cm and kept at 20 ° C. and 90% for 24 hours.
After curing with RH in a humid air and demolding, the specimen was subjected to curing in water at 20 ° C. to a predetermined age to obtain a strength measurement specimen.
【００３５】各供試体は所定材令においてＪＩＳ Ｒ
５２０１のモルタル強さ試験に準じて、圧縮強度を測定
した。得られた結果を表１に示す。Each specimen is JIS R according to the prescribed age
The compressive strength was measured according to the 5201 mortar strength test. The results obtained are shown in Table 1.
【００３６】[0036]
【表１】 [Table 1]
【００３７】表１の結果から、本発明の高強度セメント
組成物の場合には、初期強度だけでなく長期強度におい
ても、原料である普通ポルトランドセメントの場合より
著しく強度発現性がよく、一方、比較例１の場合には、
目標とするフロー値を得るための水量が多く、強度発現
性が実施例の場合に比して低く、比較例２の場合には、
水量は少なくできるが、特に初期強度発現性が低く、ま
た、比較例３又は４の場合には、原料である普通ポルト
ランドセメントの場合より強度発現性はよいが、実施例
の場合ほどではなく、また水量も多いことが分かる。From the results shown in Table 1, in the case of the high-strength cement composition of the present invention, not only in the initial strength but also in the long-term strength, the strength development is significantly better than that of the ordinary Portland cement as the raw material, while In the case of Comparative Example 1,
In the case of Comparative Example 2, the amount of water for obtaining the target flow value is large, and the strength development is low compared to the case of the Example.
Although the amount of water can be reduced, especially the initial strength development is low, and in the case of Comparative Example 3 or 4, the strength development is better than in the case of the ordinary Portland cement as the raw material, but not so much as in the Examples, It can also be seen that the amount of water is large.
【００３８】[0038]
【発明の効果】本発明の高強度セメント組成物によれ
ば、水／セメント比を低減させても流動性がよく、且つ
初期高強度を発現するのみならず、長期高強度をも発現
することができる。EFFECTS OF THE INVENTION According to the high-strength cement composition of the present invention, even if the water / cement ratio is reduced, the fluidity is good, and not only the initial high strength but also the long-term high strength is expressed. You can
Claims (1)
１５μｍの微粉と、１５μｍを越える粒径の粗粉とに分
級し、該微粉を炭酸ガス及び水蒸気に接触させて強熱減
量を０．１〜５．０重量％増加させた後、前記粗粉と混
合してなる高強度セメント組成物。1. Portland cement having a maximum particle size of 5
Fine powder of 15 μm and coarse powder having a particle size of more than 15 μm are classified, and the fine powder is brought into contact with carbon dioxide gas and steam to increase the ignition loss by 0.1 to 5.0% by weight, and then the coarse powder is added. A high-strength cement composition obtained by mixing with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35883792A JP3207956B2 (en) | 1992-12-28 | 1992-12-28 | High strength cement composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35883792A JP3207956B2 (en) | 1992-12-28 | 1992-12-28 | High strength cement composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06199547A true JPH06199547A (en) | 1994-07-19 |
| JP3207956B2 JP3207956B2 (en) | 2001-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35883792A Expired - Lifetime JP3207956B2 (en) | 1992-12-28 | 1992-12-28 | High strength cement composition |
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| Country | Link |
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| JP (1) | JP3207956B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014162715A (en) * | 2013-02-28 | 2014-09-08 | Denki Kagaku Kogyo Kk | Concrete composition and method for producing the same |
| JP2014162714A (en) * | 2013-02-28 | 2014-09-08 | Denki Kagaku Kogyo Kk | Aggregate and method for producing the same |
| JP2014162716A (en) * | 2013-02-28 | 2014-09-08 | Denki Kagaku Kogyo Kk | Concrete composition and method for producing the same |
| JP2015224168A (en) * | 2014-05-29 | 2015-12-14 | デンカ株式会社 | Cement composition and production method thereof |
-
1992
- 1992-12-28 JP JP35883792A patent/JP3207956B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014162715A (en) * | 2013-02-28 | 2014-09-08 | Denki Kagaku Kogyo Kk | Concrete composition and method for producing the same |
| JP2014162714A (en) * | 2013-02-28 | 2014-09-08 | Denki Kagaku Kogyo Kk | Aggregate and method for producing the same |
| JP2014162716A (en) * | 2013-02-28 | 2014-09-08 | Denki Kagaku Kogyo Kk | Concrete composition and method for producing the same |
| JP2015224168A (en) * | 2014-05-29 | 2015-12-14 | デンカ株式会社 | Cement composition and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3207956B2 (en) | 2001-09-10 |
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