JP2686458B2 - Cement powder composition - Google Patents
Cement powder compositionInfo
- Publication number
- JP2686458B2 JP2686458B2 JP63327721A JP32772188A JP2686458B2 JP 2686458 B2 JP2686458 B2 JP 2686458B2 JP 63327721 A JP63327721 A JP 63327721A JP 32772188 A JP32772188 A JP 32772188A JP 2686458 B2 JP2686458 B2 JP 2686458B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- water
- amount
- powder composition
- cement 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
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
- C04B7/51—Hydrating
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Description
【発明の詳細な説明】 イ．産業上の利用分野 この発明は、高流動性、高強度コンクリートに用いら
れるセメント組成物に関する。DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a cement composition used for high fluidity, high strength concrete.
ロ．従来の技術 一般に、コンクリート製品の製造や、建設工事を行な
う際に用いるコンクリートに、減水剤あるいは高性能減
水剤（以下、総称して減水剤という）を含ませて、混練
することは、広く知られている。B. 2. Description of the Related Art Generally, it is widely known that concrete used when manufacturing concrete products or performing construction works is mixed with a water reducing agent or a high-performance water reducing agent (hereinafter collectively referred to as water reducing agent) and kneading. Has been.
最近、上記減水剤の効果、特にセメント混練物の流動
性および硬化体の強度を一層高めるために、予め0.1〜1
0％の水を保持させたセメントに、減水剤を0.1〜１％混
合した特殊なセメント粉末組成物を用いることが提案さ
れている（特開昭62−162506号）。Recently, in order to further enhance the effect of the water reducing agent, particularly the fluidity of the cement kneaded product and the strength of the hardened body, 0.1 to 1
It has been proposed to use a special cement powder composition in which 0.1 to 1% of a water reducing agent is mixed with cement which holds 0% of water (JP-A-62-162506).
ハ．発明が解決しようとする問題点 しかしながら、作業の進歩状況によっては、上記セメ
ント粉末組成物をしばらくの間保管しなければならない
場合が生じる。その場合、セメントに多量の水が保持さ
れていると、そのセメントの強度低下の要因となる。ま
た単に保持させる水を少量にすると、本来の流動性向上
および強度増進の効果が得られないという欠点がある。C. Problems to be Solved by the Invention However, depending on the progress of work, there are cases where the cement powder composition must be stored for a while. In that case, if a large amount of water is retained in the cement, it causes a decrease in strength of the cement. Further, there is a drawback in that the original effect of improving fluidity and strength cannot be obtained if the amount of water to be retained is simply small.
ニ．問題を解決するための手段 本発明者らは、該組成物をしばらくの間保管しても、
その混練物の流動性の向上はもちろんのこと、固結の生
成の抑制および強度低下の防止の効果のある組成物につ
いて研究した結果、該組成物に含まれるC3Aおよび保持
される水の量を限定すれば、上記の問題点を解消できる
ことを知見して、本発明を完成させた。D. Means for Solving the Problem The present inventors have found that even if the composition is stored for a while,
As a result of research on a composition having the effect of suppressing the formation of caking and preventing the reduction of strength as well as improving the fluidity of the kneaded product, C 3 A contained in the composition and the water retained therein are retained. The present invention has been completed by finding that the above problems can be solved by limiting the amount.
すなわち、本発明の要旨は、ポルトランドセメントに
水を均一に混合したセメント粉末組成物において、上記
セメントのC3Aが５％以下で、かつ上記の水の量がセメ
ントに対し0.1〜1.0％であるセメント粉末組成物にあ
る。That is, the gist of the present invention is that, in a cement powder composition in which water is uniformly mixed with Portland cement, C 3 A of the cement is 5% or less, and the amount of water is 0.1 to 1.0% with respect to the cement. In one cement powder composition.
ポルトランドセメントは通常８〜10％程度のC3Aを含
有しているが、本発明ではC3A含有量が５％以下のセメ
ントを用いる。５％より多いと、高い流動性を有する混
練物を得るための水量が多くなる。Portland cement usually contains about 8 to 10% of C 3 A, but in the present invention, cement having a C 3 A content of 5% or less is used. When it is more than 5%, the amount of water for obtaining a kneaded product having high fluidity increases.
このセメントを高速攪拌しながら水を噴霧しまたは水
蒸気を吹き付ける等の方法で、セメントの水の量が0.1
〜1.0％になるまでセメント粒子の表面に均一に水を保
持させる。0.1％より少ないと添加の効果が小さく、ま
た1.0％より多いと固結の生成量が多く、セメントの硬
化体の強度が低下する。The amount of water in the cement can be reduced to 0.1 by spraying water or spraying steam while stirring this cement at high speed.
Keep water evenly on the surface of the cement particles until ~ 1.0%. If it is less than 0.1%, the effect of addition is small, and if it is more than 1.0%, the amount of caking is large, and the strength of the hardened cement product is reduced.
なお、セメントに保持された水量は、熱重量測定（T
G）により40〜100℃での重量減少分から算定する。The amount of water retained in cement was measured by thermogravimetry (T
G) to calculate from the weight loss at 40 to 100 ℃.
減水剤を併用する場合には、噴霧する水に溶解させる
かまた粉末の場合には高速攪拌中のセメントに添加して
もよい。またモルタルまたはコンクリート原料を混練す
る際に添加してもよい。When a water reducing agent is used in combination, it may be dissolved in water to be sprayed, or in the case of a powder, it may be added to cement under high speed stirring. It may also be added when kneading the mortar or concrete raw material.
ホ．実施例 セメント製造業において慣用のセメント原料、すなわ
ち、石灰石、珪石、粘土、銅からみを配合し、粉砕し
て、ロータリーキルンで、約1500℃で焼成して得たクリ
ンカに、排煙脱硫石膏を加えてボールミルで、ブレーン
比表面積3100cm2/gとなるまで粉砕して、表１に示す４
種類の組成のポルトランドセメントを製造した。E. Example Cement raw materials commonly used in the cement manufacturing industry, that is, limestone, silica stone, clay, and copper entanglement were mixed, pulverized, and clinker obtained by firing at about 1500 ° C. in a rotary kiln, and flue gas desulfurization gypsum was added. Crushed with a ball mill to a Blaine specific surface area of 3100 cm 2 / g.
Different types of Portland cement were produced.
A,B,C,D4種のセメントそれぞれを、内容量200の２
軸式ニーダで攪拌しつつ、超音波噴霧器でセメントに対
し、0,0.4,0.8,1.2,1.6％の水を保持させて計20種のセ
メント組成物をつくり、以下の実験を行なった。 Each of A, B, C, D4 types of cement, each with a content of 200
While stirring with a shaft type kneader, 0, 0.4, 0.8, 1.2, 1.6% of water was retained in the cement with an ultrasonic atomizer to make 20 kinds of cement compositions in total, and the following experiments were conducted.
１） 流動性の試験（セメントペーストによるフロー試
験） 上記セメント組成物200gに対し、水セメント比35％に
相当する水70g及び、添加率0.8％に相当する高性能減水
剤（βナフタリンスルホン酸ホルマリン縮合物塩−花王
社製商品名マイティ150を1.6g）を加え、練り鉢中でよ
く混練した。４分間混練後、水平に静置したガラス板上
に、内径50mm、高さ50mmの塩化ビニル製円筒をのせ、そ
の中に混練したセメントペーストを充満させた。円筒を
す速く上方にとり去り、ペーストのガラス板上への拡が
りが停止するのを待ってペーストの拡がりの直径を直角
方向に２度測定し、その平均値をフロー値とした。1) Flowability test (flow test using cement paste) 70 g of water corresponding to 35% of water cement ratio to 200 g of the above cement composition, and a high performance water reducing agent (β-naphthalenesulfonic acid formalin corresponding to 0.8% addition rate) 1.6 g of a condensate salt-Mighty 150 (trade name, manufactured by Kao Corporation) was added and well mixed in a kneading bowl. After kneading for 4 minutes, a vinyl chloride cylinder having an inner diameter of 50 mm and a height of 50 mm was placed on a horizontally standing glass plate, and the kneaded cement paste was filled therein. The cylinder was quickly removed upward, and after the spread of the paste on the glass plate was stopped, the diameter of the spread of the paste was measured twice at right angles, and the average value was used as the flow value.
セメントペーストのフロー試験結果を表２および図に
示す。The flow test results of the cement paste are shown in Table 2 and the figure.
C3Aの少ないセメントを用いた方が、低い水の保持量
でより大きなフロー値が得られることがわかる。この他
に、セメント中のC3S,C2Sを変化させて実験を行なった
が、C3Aとフロー値の傾向は、上記と同様であった。 It can be seen that a larger flow value can be obtained at a lower water retention amount by using a cement having a lower C 3 A. In addition to this, an experiment was conducted by changing C 3 S and C 2 S in the cement, but the tendency of C 3 A and the flow value was the same as above.
２） 固結発生量の試験 上記のセメントB,Dに、ニーダ中で0,0.4,0.8,1.2,1.6
％の水を保持させた。この10種のセメント組成物につい
て、以下の実験を行なった。2) Test for the amount of caking generated 0,0.4,0.8,1.2,1.6 in the kneader in the above cements B and D
% Water was retained. The following experiments were carried out on the ten types of cement compositions.
各セメント組成物を40kgずつセメント包装用紙袋中に
封入し、温度20℃、相対湿度70％の恒温恒湿室中に静置
して、１ヵ月間放置した。１ヵ月後に、各袋を開封し、
840μｍの網篩で40kg全量をふるい、残分の重量百分率
をもとめ、固結発生量とした。その結果を表３に示す。40 kg of each cement composition was enclosed in a cement wrapping paper bag, allowed to stand in a constant temperature and humidity room at a temperature of 20 ° C. and a relative humidity of 70%, and left for one month. After one month, open each bag,
The total amount of 40 kg was sieved with a 840 μm mesh sieve, and the weight percentage of the residue was determined to be the amount of solidification. Table 3 shows the results.
固定結発生量は、水保持量1.2％以上で、急激に増加
している。 The amount of fixed particles generated is 1.2% or more of water retention, and is rapidly increasing.
３） コンクリート圧縮強度試験 実験例で用いたＢ（C3A＝3.9％）およびＤ（C3A＝8.0
％）のセメントを用いて、コンクリート圧縮強度試験を
行なった。なおそれぞれのセメントは、ニーダ中で水を
保持させた後、固結発生量試験と同様に、セメント包装
用紙袋中に封入し、温度20℃で、相対湿度70％の恒温恒
湿室中、１ヵ月間放置した上で用いた。3) Concrete compressive strength test B (C 3 A = 3.9%) and D (C 3 A = 8.0) used in the experimental example
%) Cement was used to perform a concrete compressive strength test. Each of the cements, after holding water in a kneader, was sealed in a cement wrapping paper bag in the same manner as in the caking amount test, and at a temperature of 20 ° C. and a relative humidity of 70% in a constant temperature and humidity chamber, It was used after being left for one month.
使用セメントの水保持量は、ペーストフロー値が同じ
になるように、すなわち、Ｂに水を0.4％保持させた後
放置、Ｄに水を1.2％保持させた後放置し調整した。The water retention amount of the cement used was adjusted so that the paste flow value was the same, that is, B was kept at 0.4% water and left, and D was kept at 1.2% water and then left.
使用骨材は青梅産砕石と富士川産川砂、使用減水剤は
βナフタリンスルホン酸ホルマリン縮合物塩（花王社製
商品名マイティ150）であり、単位セメント量420kg/
m3、スランプ目標値6cm、減水剤添加率はセメントに対
し1.2％、細骨材率0.42の条件でコンクリートを混練し
た。供試体は、φ10×20cmの型枠で成型し、24時間後に
脱型し、以後20℃で水中養成した。この供試体のコンク
リート圧縮強度試験結果を表４に示す。The aggregate used is crushed stone from Ome and river sand from Fujikawa, and the water-reducing agent used is β-naphthalenesulfonic acid formalin condensate salt (Kao's product name Mighty 150) with a unit cement amount of 420 kg /
Concrete was mixed under the conditions of m 3 , slump target value of 6 cm, water reducing agent addition rate of 1.2% relative to cement, and fine aggregate rate of 0.42. The specimen was molded with a φ10 × 20 cm mold, demolded 24 hours later, and thereafter cured in water at 20 ° C. Table 4 shows the concrete compressive strength test results of this test piece.
セメント中のC3Aが3.9％の供試体において、水保持量
が0.4％のものは、０％のものに比べ圧縮強度は増加し
た。また、セメント中のC3Aが3.9のものは、8.0％のも
のに比べ圧縮強度が高いことが認められた。 In the specimen with C 3 A in the cement of 3.9%, the one with a water retention of 0.4% increased the compressive strength as compared with the one with 0%. It was also confirmed that the cement with C 3 A of 3.9 had higher compressive strength than that with 8.0%.
ヘ．発明の効果 本発明のセメント粉末組成物は、従来技術に比し、セ
メントに保持させる水の量を少なくすることを可能と
し、保存時の固結発生量が低減され、固結による硬化体
の強度低下の問題を解決できる。さらに、水の保持量が
少なくなったことにより、セメントに水を添加する工程
等における集塵機の閉塞や、混練機、輸送機への付着な
ども減少するという効果が得られる。F. EFFECTS OF THE INVENTION The cement powder composition of the present invention makes it possible to reduce the amount of water to be retained in cement as compared with the prior art, the amount of caking generated during storage is reduced, and the hardened body due to caking The problem of strength reduction can be solved. Further, since the amount of water retained is reduced, it is possible to obtain an effect that clogging of the dust collector in the process of adding water to cement and the like, and adhesion to the kneader and the transport machine are reduced.
Claims (1)
たセメント粉末組成物において、上記セメントのC3Aが
５％以下で、かつ上記の水の量がセメントに対し0.1〜
1.0％であるセメント粉末組成物。1. A cement powder composition in which water is evenly mixed with Portland cement, wherein C 3 A of the cement is 5% or less, and the amount of water is 0.1 to 10% with respect to the cement.
A cement powder composition that is 1.0%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63327721A JP2686458B2 (en) | 1988-12-27 | 1988-12-27 | Cement powder composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63327721A JP2686458B2 (en) | 1988-12-27 | 1988-12-27 | Cement powder composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02175637A JPH02175637A (en) | 1990-07-06 |
| JP2686458B2 true JP2686458B2 (en) | 1997-12-08 |
Family
ID=18202247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63327721A Expired - Lifetime JP2686458B2 (en) | 1988-12-27 | 1988-12-27 | Cement powder composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2686458B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH069258A (en) * | 1991-03-07 | 1994-01-18 | Nippon Cement Co Ltd | Superhigh-fluidity concrete |
| JP7256648B2 (en) * | 2019-01-31 | 2023-04-12 | Ｕｂｅ三菱セメント株式会社 | Cement composition evaluation method and manufacturing method |
-
1988
- 1988-12-27 JP JP63327721A patent/JP2686458B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02175637A (en) | 1990-07-06 |
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