JP2916482B2 - High strength cement composition - Google Patents
High strength cement compositionInfo
- Publication number
- JP2916482B2 JP2916482B2 JP13410290A JP13410290A JP2916482B2 JP 2916482 B2 JP2916482 B2 JP 2916482B2 JP 13410290 A JP13410290 A JP 13410290A JP 13410290 A JP13410290 A JP 13410290A JP 2916482 B2 JP2916482 B2 JP 2916482B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- fine powder
- water
- strength
- powder
- 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.)
- Expired - Lifetime
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【発明の詳細な説明】 ［イ．産業上の利用分野］ 本発明は、セメントを分級して、特定の最大粒子径か
らなる微粉と粗粉とにし、前者を一部水和させたのち、
粗粉と混合した、高強度を発現するセメント組成物に関
する。DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION FIELD] The present invention classifies cement into fine powder and coarse powder having a specific maximum particle diameter, and after partially hydrating the former,
The present invention relates to a cement composition exhibiting high strength mixed with coarse powder.
［ロ．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たりして、0.1〜10重量％の水を均
質に吸収させ、セメントを部分的に水和させた、いわゆ
る部分水和セメントに高性能減水剤を添加してつくった
モルタル・コンクリート等の混練物は、もとのセメント
に単に高性能減水剤を添加した混練物より流動性が向上
することが知られている（特開 昭62−162506）。[B. 2. Description of the Related Art Conventionally, a so-called partial water in which 0.1% to 10% by weight of water is uniformly absorbed by bringing steam into contact with the entire cement or spraying water by spraying to partially hydrate the cement. It is known that kneaded materials such as mortar and concrete made by adding a high-performance water reducing agent to Japanese cement have higher fluidity than kneaded materials obtained by simply adding a high-performance water reducing agent to the original cement ( JP-A-62-162506).
［ハ．発明が解決しようとする問題点］ 前記従来法による部分水和セメントを用いた混練物
は、確かに流動性が改善されることが認められる。しか
も、その混練物は、流動性を一定にした場合、水／セメ
ント比が数％低下する。[C. Problems to be Solved by the Invention] It is recognized that the kneaded product using the partially hydrated cement according to the conventional method can certainly improve the fluidity. Moreover, in the kneaded material, when the fluidity is kept constant, the water / cement ratio is reduced by several percent.
一般に、高強度のセメント硬化体を製造する場合の配
合設計は、水／セメント比を下げるのが初歩的な常套手
段である。In general, the blending design for the production of a high-strength hardened cement is to use a water / cement ratio as a rudimentary routine.
しかるに、前記従来法では、水／セメント比が数％低
下するにもかかわらず、硬化体の強度の増伸はきわめて
小さいことがわかる（表−１）。そのために、高強度の
硬化体を欲するときには、ペースト部分を増加させるこ
とになるが、これがかえって乾燥収縮の原因となり、ひ
いてはクラック発生につながるという別の欠点が生じ
る。However, it can be seen that in the conventional method, the increase in strength of the cured product is extremely small even though the water / cement ratio is reduced by several percent (Table 1). Therefore, when a high-strength cured body is desired, the paste portion is increased, but this causes dry shrinkage, which leads to another disadvantage that cracks are generated.
［ニ．問題点を解決するための手段］ そこで本発明者らは、流動性が一定で、水／セメント
比を低下させたままの混練物を製造でき、かつ高強度を
発現できる、つまり従来法の部分水和セメントの改良に
ついて追及した結果、微粉部分の一部を水和させたセメ
ントが目的にかなうことを知見して、以下に述べる発明
を完成に導いた。[D. Means for Solving the Problems] Accordingly, the present inventors have been able to produce a kneaded product having a constant fluidity and a reduced water / cement ratio and exhibit high strength, that is, a part of the conventional method. As a result of pursuing the improvement of the hydrated cement, it was found that a cement in which a part of the fine powder portion was hydrated met the purpose, and led to completion of the invention described below.
すなわち、本発明の要旨は、ポルトランドセメント
を、最大粒子径が５〜15μｍの微粉と粗粉とに分級し、
該微粉に散水することにより、強熱減量を0.1〜1.5重量
％増加させたのち、これと前記粗粉とを混合してなる高
強度を発現するセメント組成物を提供するにある。That is, the gist of the present invention is to classify Portland cement into a fine powder and a coarse powder having a maximum particle size of 5 to 15 μm,
It is an object of the present invention to provide a cement composition exhibiting high strength by spraying water on the fine powder to increase the ignition loss by 0.1 to 1.5% by weight and then mixing the coarse powder with the coarse powder.
以下、本発明を詳細に説明する。Hereinafter, the present invention will be described in detail.
本発明において使用されるポルトランドセメントは、
JIS規格に従った通常の普通、早強、中庸熱及び耐硫酸
塩ポルトランドセメントである。Portland cement used in the present invention,
It is ordinary ordinary, fast-strength, moderate heat and sulfate resistant Portland cement according to JIS standard.
そのポルトランドセメントを貫用の分級機を用いて微
粉と粗粉に分級する。その場合、微粉の最大粒子径が５
〜15μｍの範囲内にあることが、本発明において肝要で
あり、それが５μｍ未満及び15μｍを超えた場合、いず
れも強度の増伸がなく好ましくない。ここで最大粒子径
とは、レーザー回折式粒度分布測定機で微粉の粒度分布
を測定して求めた体積基準99％通過粒径をいう。The Portland cement is classified into fine powder and coarse powder using a classifier for penetration. In that case, the maximum particle size of the fine powder is 5
It is important in the present invention that the thickness is within the range of 1515 μm, and when it is less than 5 μm or more than 15 μm, the strength is not increased either. Here, the maximum particle size means a 99% volume-based particle size obtained by measuring the particle size distribution of fine powder with a laser diffraction type particle size distribution analyzer.
慣用の分級機には、たとえば大規模なものとしてはス
ターテバント型セパレータ、サイクロン型セパレータな
どが、中小規模のものとしては、ターボクラシファイア
などがある。Conventional classifiers include, for example, large-scale classifiers such as startervant type separators and cyclone-type separators, and small- and medium-scale classifiers include turbo classifiers.
上記分級機でポルトランドセメントを分級した場合、
ある粒子径を中心にして、それより細かい粉末と粗い粉
末とに明瞭に分級せず、粗い粉末中に細かい粒子が含ま
れるのが通常である。本発明でいえば、微粉の最大粒子
径以下の本来微粉に含まれるべき細かい粉末の一部が、
粗粉側に含まれる。本発明では、最大粒子径以下の粉末
中、その５〜50重量％が微粉に分級されていることが望
ましい。When Portland cement is classified by the above classifier,
With a certain particle size as a center, fine particles are not clearly classified into finer and coarser powders, and fine particles are usually included in the coarse powder. Speaking of the present invention, part of the fine powder that should be included in the fine powder below the maximum particle size of the fine powder,
Included on the coarse powder side. In the present invention, it is desirable that 5 to 50% by weight of the powder having a particle diameter equal to or less than the maximum particle diameter is classified into fine powder.
以上はポルトランドセメントを対象に説明したが、そ
の原料であるセメントクリンカー及び石膏を上述の粒度
構成になるように粉砕して微粉と粗粉を製造しても、同
じ効果が得られるのて、この方法による場合も本発明に
含まれる。ただし、この方法による場合、微粉と粗粉を
混合した時、JIS規格に適合したポルトランドセメント
が得られなければならないのは当然である。Although the above has been described with reference to Portland cement, the same effect can be obtained even if fine powder and coarse powder are produced by pulverizing the cement clinker and gypsum, which are the raw materials, to have the above-mentioned particle size configuration. The method is also included in the present invention. However, in the case of using this method, when fine powder and coarse powder are mixed, it is natural that Portland cement conforming to the JIS standard must be obtained.
微粉は、慣用の装置を適宜利用して（例えば、二軸式
ニーダと超音波加湿機の組合せ、流動層とスプレーノズ
ルの組合せ等）、散水される。散水方法は、微粉を高速
で撹拌しながら、あるいは浮遊状態にしておいたところ
へ、水蒸気を吹きつけるか、または水を噴霧することに
よって、均一に微粉に水が付着するようにする。散水さ
れた微粉は、エトリンガイト等の初期水和物が生成し水
が固定されるまで（約10分程度）静置しておくのが好ま
しい。The fine powder is sprinkled by appropriately using a conventional apparatus (for example, a combination of a twin-screw kneader and an ultrasonic humidifier, a combination of a fluidized bed and a spray nozzle). In the water spraying method, water is uniformly attached to the fine powder by spraying water vapor or spraying water while stirring the fine powder at a high speed or in a floating state. The sprinkled fine powder is preferably allowed to stand until an initial hydrate such as ettringite is formed and the water is fixed (about 10 minutes).
散水量は、散水前後の微粉の強熱減量の差が、0.1〜
1.5重量％となる量であり、本発明のもう一つの重要な
点である。普通ポルトランドセメントを分級して得た微
粉の強熱減量は約１〜５重量％（分級前の普通ポルトラ
ンドセメントのそれは約１重量％）であるが、散水によ
り強熱減量を増加させる。それだけ微粉の水和活性が緩
和されることになる。The difference in ignition loss of fine powder before and after watering is 0.1 to
This amount is 1.5% by weight, which is another important point of the present invention. The loss on ignition of fine powder obtained by classifying ordinary Portland cement is about 1 to 5% by weight (about 1% by weight of that of ordinary Portland cement before classification), but water loss increases the ignition loss. As a result, the hydration activity of the fine powder is reduced.
散水による強熱減量増が、0.1重量％未満及び1.5重量
％を越えた場合、いずれも強度改善に対する効果がなく
好ましくない。If the increase in ignition loss due to watering is less than 0.1% by weight or more than 1.5% by weight, none of them has an effect on improving strength, which is not preferable.
なお、強熱減量はポルトランドセメントの微粉を風化
させて増加するが、その場合は、吸水のほかにCO2の吸
収も多く、逆に、強度の大きな低下を招くことになる。Incidentally, the loss on ignition is increases by weathering fines portland cement, if so, many in addition to the absorption of CO 2 in the water, on the contrary, results in significant reduction in strength.
以上の様にして散水された微粉と、当初に分級された
粗粉とを慣用の混合機（例えばエアブレンダ、回転円筒
型混合機、Ｖ型混合機など）によって充分混合すれば、
部分的に水和した本発明のセメント組成物が得られる。
このセメント組成物を用いたモルタルやコンクリート硬
化体は、長期材令はもとより、特に初期材令において発
現する強度が格段に向上する（表−１）。If the fine powder sprinkled as described above and the coarse powder initially classified are sufficiently mixed by a conventional mixer (for example, an air blender, a rotary cylindrical mixer, a V-type mixer, etc.),
A partially hydrated cement composition of the invention is obtained.
The mortar and the concrete hardened body using this cement composition have not only a long-term age but also a remarkably improved strength especially at an early age (Table 1).
以下、本発明を実施例に基づいて説明する。 Hereinafter, the present invention will be described based on examples.
［ホ．実施例］ 実施例１〜５、比較例１〜４ 以下に述べる材料、配合によって、流動性を一定にし
たモルタル混練物をつくり、その硬化体の強度を測定し
た。[E. Examples] Examples 1 to 5 and Comparative Examples 1 to 4 A mortar kneaded material having a constant fluidity was prepared from the following materials and formulations, and the strength of the cured product was measured.
（セメント組成物の調整） 普通ポルトランドセメント（日本セメント社製、強熱
減量1.0％）をターボクラシファイア（日清エンジニア
リング社製「TC−15N」）を用いて、４種類の微粉と粗
粉に分級した。各微粉の最大粒子径を表−１に示す。微
粉の強熱減量は2.5〜3.6重量％だった。(Adjustment of cement composition) Ordinary Portland cement (manufactured by Nippon Cement Co., 1.0% loss on ignition) is classified into four types of fine powder and coarse powder using a turbo classifier ("TC-15N" manufactured by Nisshin Engineering Co., Ltd.). did. Table 1 shows the maximum particle size of each fine powder. The loss on ignition of the fines was 2.5-3.6% by weight.
分級した微粉を二軸式ニーダで高速撹拌しているとこ
ろへ、超音波加湿機で発生した水の微粒子を噴霧した
後、30分静置し、充分水和させた。水の微粒子を噴霧す
る時間を適宜増減し、表−１に示すような強熱減量の増
加したそれぞれの微粉を得た。Fine particles of water generated by an ultrasonic humidifier were sprayed onto a place where the classified fine powder was stirred at high speed with a biaxial kneader, and then allowed to stand for 30 minutes to be sufficiently hydrated. The time for spraying the fine particles of water was appropriately increased or decreased to obtain each fine powder having an increased ignition loss as shown in Table-1.
以上の処理を経た各微粉は、当初分級した対応する粗
粉と、Ｖ型混合機で充分混合し、それぞれのセメント組
成物を製造した。Each of the fine powders having undergone the above treatments was sufficiently mixed with the corresponding coarse powders initially classified by a V-type mixer to produce respective cement compositions.
（モルタルの製造及び強度測定） 前記セメント組成物を用いて、セメント：砂を1:3と
し、高性能減水剤βナフタレンスルホン酸ホルマリン縮
合物塩の水溶液（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、水を加えてホバートミキサで混練し、フロー値190
±1mmのモルタル混練物をつくった。なお、上記砂は豊
浦標準砂（0.10〜0.30mm）、相馬珪砂特４号（0.42〜1.
68mm）及び相馬珪砂３号（0.84〜2.38mm）を等量混合し
たものである。(Production of mortar and measurement of strength) Using the cement composition, cement: sand was set to 1: 3, and an aqueous solution of a high-performance water reducing agent β-naphthalenesulfonic acid formalin condensate (“Mighty 150” manufactured by Kao Corporation, solid content 40
Wt.) Was added to the cement composition at 1.2 wt.%, Water was added and the mixture was kneaded with a Hobart mixer, and the
A mortar mixture of ± 1 mm was made. The above sand is Toyoura standard sand (0.10 ~ 0.30mm), Soma silica sand special No.4 (0.42-1.
68mm) and Soma Quartz Sand No. 3 (0.84 to 2.38mm) in equal amounts.
得られた各混練物を成形（４×４×16cm）し、24時間
湿空養生し、脱型したのち、所定材令まで水和養生し
て、それぞれの供試体を得た。養生温度はいずれも20℃
とした。Each of the obtained kneaded materials was molded (4 × 4 × 16 cm), cured in a moist air for 24 hours, demolded, and then hydrated and cured to a predetermined material age to obtain each specimen. Curing temperature is 20 ℃
And
各供試体は、所定材令にて、JIS R 5201の「強さ試
験」に準じた方法で、圧縮強度を測定し、得た結果を表
−１に併記した。For each specimen, the compressive strength was measured at a prescribed age by a method according to the “strength test” of JIS R 5201, and the obtained results are also shown in Table 1.
［ヘ．発明の効果］ 本発明は、ポルトランドセメントを特定の最大粒子径
を具備する微粉とそれ以外の粗粉とに分級し、前者に特
定量の水を与えて水和させた後、粗粉と混合してなるセ
メント組成物に係り、ポルトランドセメント全体に水を
付与した公知の方法の改良である。該組成物を用い一定
の流動性を有するモルタル又はコンクリート混練物から
つくった硬化体は、公知の方法で得たセメントを用いて
同様にしてつくった硬化体と比較して、十数〜数十％も
強度が増伸し、特に初期材令において発現するそれは、
格別に大きい特徴がある。 [F. Effects of the Invention] The present invention classifies Portland cement into a fine powder having a specific maximum particle size and a coarse powder other than the fine powder, hydrates the former by giving a specific amount of water, and then mixes with the coarse powder. It is an improvement of a known method in which water is applied to the entire Portland cement in the cement composition thus obtained. A cured product made from a mortar or a concrete kneaded product having a certain fluidity using the composition, compared with a cured product similarly produced using cement obtained by a known method, is more than tens to several tens. %, The strength of which increases, especially in early ages,
There is a special feature.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C04B 7/00 - 7/60 C04B 28/00 - 28/36 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 6 , DB name) C04B 7/00-7/60 C04B 28/00-28/36
Claims (1)
〜15μｍの微粉と、粗粉とに分級し、該微粉に散水する
ことにより強熱減量を0.1〜1.5重量％増加させたのち、
これと前記粗粉とを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
After classifying into fine powder and coarse powder of up to 15 μm and spraying water on the fine powder, the ignition loss is increased by 0.1 to 1.5% by weight.
High-strength cement composition obtained by mixing this with the coarse powder
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13410290A JP2916482B2 (en) | 1990-05-25 | 1990-05-25 | High strength cement composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13410290A JP2916482B2 (en) | 1990-05-25 | 1990-05-25 | High strength cement composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0431349A JPH0431349A (en) | 1992-02-03 |
| JP2916482B2 true JP2916482B2 (en) | 1999-07-05 |
Family
ID=15120499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13410290A Expired - Lifetime JP2916482B2 (en) | 1990-05-25 | 1990-05-25 | High strength cement composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2916482B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3215516B2 (en) * | 1991-09-20 | 2001-10-09 | 太平洋セメント株式会社 | Hydraulic composition and method for producing concrete pile using the composition |
| JP4907754B2 (en) * | 2000-04-26 | 2012-04-04 | 太平洋セメント株式会社 | High fluidity high strength concrete |
| JP5593579B2 (en) * | 2005-08-08 | 2014-09-24 | 宇部興産株式会社 | Concrete composition and method for producing the same |
| WO2015130284A1 (en) * | 2014-02-27 | 2015-09-03 | Halliburton Energy Services, Inc. | Passivated cement accelerator |
-
1990
- 1990-05-25 JP JP13410290A patent/JP2916482B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0431349A (en) | 1992-02-03 |
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