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JP3385884B2 - High fluidity cement composition - Google Patents

High fluidity cement composition

Info

Publication number
JP3385884B2
JP3385884B2 JP31209196A JP31209196A JP3385884B2 JP 3385884 B2 JP3385884 B2 JP 3385884B2 JP 31209196 A JP31209196 A JP 31209196A JP 31209196 A JP31209196 A JP 31209196A JP 3385884 B2 JP3385884 B2 JP 3385884B2
Authority
JP
Japan
Prior art keywords
gypsum
cement
weight
flow
amount
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
Application number
JP31209196A
Other languages
Japanese (ja)
Other versions
JPH10152359A (en
Inventor
秀明 五十嵐
篤 松永
祐夫 弓削
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ube Corp
Original Assignee
Ube Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ube Industries Ltd filed Critical Ube Industries Ltd
Priority to JP31209196A priority Critical patent/JP3385884B2/en
Publication of JPH10152359A publication Critical patent/JPH10152359A/en
Application granted granted Critical
Publication of JP3385884B2 publication Critical patent/JP3385884B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00Hydraulic cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/60Flooring materials
    • C04B2111/62Self-levelling compositions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、コンクリートの製
造やセルフレベリング材として好適な、高流動性で且つ
高強度発現性に優れた、高流動性セメント組成物に関す
る。
TECHNICAL FIELD The present invention relates to a high-fluidity cement composition which is suitable as a concrete production material and a self-leveling material and which has a high fluidity and a high strength development property.

【0002】[0002]

【従来の技術】近年コンクリート構造物の高層化と同時
に、施工方法の合理化、省力化に伴って、高強度発現性
に優れ、単位水量を高めることなく、締め固め作業が不
要で過密な配筋中や狭部を有する型枠の細部にまで行き
渡る流動性に優れたセメント組成物の開発が進められて
いる。また自己流動性が要求されるセメント系セルフレ
ベリング材としてもさらに流動性の高いものが求められ
ている。
2. Description of the Related Art In recent years, along with the increase in the number of layers of concrete structures, along with the rationalization of construction methods and labor saving, excellent strength development has been achieved, and compaction work is not required without increasing the unit water volume, and overcrowded bar arrangement is required. The development of a cement composition having excellent fluidity that extends to the details of a mold having a middle portion and a narrow portion is underway. Further, as a cement-based self-leveling material which is required to have self-fluidity, one having higher fluidity is required.

【0003】この目的に使われるセメントとしては、ポ
ルトランドセメントに高炉スラグ、フライアッシュ、石
灰石粉等の各種混和材や各種高性能AE減水剤、増粘剤
を添加したセメント、粒度分布を調整したセメント、セ
メント粒子を球状化したセメント等が提案されている。
As the cement used for this purpose, Portland cement is mixed with various admixtures such as blast furnace slag, fly ash, and limestone powder, various high-performance AE water reducing agents, cements to which thickeners are added, and cements whose particle size distribution is adjusted. , A cement obtained by spheroidizing cement particles has been proposed.

【0004】しかし、混合材を添加すると、品質管理が
煩雑となるだけでなく、硬化後の耐久性が低下し、高強
度コンクリートが得られにくいという難点があった。ま
た、粒度分布を調整したセメントやセメント粒子を球状
化したセメントの製造には、通常のセメント製造の設
備、工程の他に、特性を付与するための特別な設備、工
程を必要とするだけでなく、分別を必要とすることから
生産性が著しく低下するという問題があった。
However, the addition of the admixture not only complicates the quality control, but also deteriorates the durability after curing, making it difficult to obtain high-strength concrete. In addition, in order to manufacture cement with adjusted particle size distribution and cement with spheroidized cement particles, in addition to ordinary cement manufacturing equipment and processes, special equipment and processes for imparting properties are required. However, there is a problem that productivity is remarkably reduced because separation is required.

【0005】これ等の難点を克服する一つの方法とし
て、特開平6ー80456号公報には、3CaO・Al
23と4CaO・Al23・Fe23固溶体量を低減す
ると共に2CaO・SiO2量を増したクリンカーに、
不溶性無水石膏を石膏全体の50重量%以上含む石膏を
加え、更に分散剤を添加した流動性水硬性組成物が提案
されている。ここで提案されている組成物よると、前記
難点特に生産上での問題はかなり改善されるが、特性の
面では、例えばフロー値が240mmより小さく、未だ
不十分であり、特に、より長時間でのフローロスの抑制
については改良が必要とされていた。
As one method of overcoming these difficulties, Japanese Patent Laid-Open No. 6-80456 discloses 3CaO.Al.
The clinker of increased 2CaO · SiO 2 weight while reducing 2 O 3 and 4CaO · Al 2 O 3 · Fe 2 O 3 solid solution amount,
A fluid hydraulic composition has been proposed in which gypsum containing 50% by weight or more of insoluble anhydrous gypsum is added, and a dispersant is further added. According to the composition proposed here, the above-mentioned drawbacks, in particular, the problems in production are considerably improved, but in terms of characteristics, for example, the flow value is smaller than 240 mm, it is still insufficient, and especially for a longer time. Improvements were needed for the suppression of flow loss in Japan.

【0006】[0006]

【発明が解決しようとする課題】本発明は、極めて高い
流動性を発現するセメント組成物の提供を課題とする。
また、本発明は、前記提案の高流動性セメント組成物よ
り更に改良された、特に、フローの保持性に優れた高流
動性セメント組成物の提供を課題とする。
DISCLOSURE OF THE INVENTION An object of the present invention is to provide a cement composition exhibiting extremely high fluidity.
Another object of the present invention is to provide a high-fluidity cement composition which is further improved than the above-proposed high-fluidity cement composition, and particularly excellent in flow retention.

【0007】[0007]

【課題を解決するための手段】本発明者らは、セメント
組成物の特性とフローの低下の関係について検討した結
果、フローの低下は、セメント中における鉱物組成と半
水石膏の量、ブレーン比表面積、n値と密接な関係があ
り、これらの値を特定の範囲に調整したセメント組成物
が、少量の高性能AE減水剤の添加においても流動性に
優れること、更に、長時間にわたってフローの低下がほ
とんど生じないこと等を知見し、本発明に至った。すな
わち、本発明は、13重量%以下の4CaO・Al23
・Fe23、5重量%以下の3CaO・Al2 3 を含
み、残部が3CaO・SiO2及び2CaO・SiO2
りなるクリンカーと3〜7重量%の石膏で構成され、半
水石膏量が全石膏に対して37重量%以上且つセメント
成分全体に対して2.5重量%以下であり、無水石膏量
が全石膏に対して35重量%以下である、ブレーン比表
面積が3000〜4500cm2/gのセメント成分に
更に高性能AE減水剤を添加した高流動性セメント組成
物に関する。以下に、本発明を説明する。
As a result of examining the relationship between the characteristics of the cement composition and the decrease in the flow, the inventors found that the decrease in the flow was due to the mineral composition in the cement, the amount of hemihydrate gypsum, and the Blaine ratio. It has a close relationship with the surface area and the n value, and the cement composition in which these values are adjusted within a specific range has excellent fluidity even when a small amount of a high-performance AE water reducing agent is added. The present invention has been accomplished by finding that the decrease hardly occurs. That is, the present invention provides 13% by weight or less of 4CaO.Al 2 O 3
· Fe include 2 O 3, 5 wt% or less of 3CaO · Al 2 O 3, balance is composed of clinker and 3-7% gypsum consisting 3CaO · SiO 2 and 2CaO · SiO 2, hemihydrate gypsum weight Is 37% by weight or more with respect to the total gypsum and 2.5% by weight or less with respect to the entire cement component, the amount of anhydrous gypsum is 35% by weight or less with respect to the total gypsum, and the Blaine specific surface area is 3000 to 4500 cm 2. High-fluidity cement composition in which a high-performance AE water reducing agent is further added to the cement component of 1 / g. The present invention will be described below.

【0008】本発明において、クリンカー中に含まれる
4CaO・Al23・Fe23及び3CaO・Al23
の量は流動性と密接に関係する。4CaO・Al23
Fe23が13重量%を越えると、また、3CaO・A
23が5重量%を越えると流動性が低下し、またフロ
ーロスも大きくなるので、4CaO・Al23・Fe2
3は13重量%以下、好ましくは8重量%以下にし、
3CaO・Al23は5重量%以下、好ましくは4重量
%以下にする。また残部成分中の3CaO・SiO2
多くなると、換言すると、2CaO・SiO2が少ない
と、初期強度は高くなるが流動性が低下し、フローロス
も大きくなるので、流動性をより高めるためには2Ca
O・SiO2は残部中の40重量%以上、好ましくは5
0〜70重量%にするのが望ましい。2CaO・SiO
2を多くすることによって低発熱で高流動性のセメント
組成物にすることができる。
[0008] In the present invention, 4CaO · Al 2 O 3 · Fe 2 O 3 and 3CaO · Al 2 O 3 contained in the clinker
The amount of is closely related to liquidity. 4CaO ・ Al 2 O 3
When Fe 2 O 3 exceeds 13% by weight, 3CaO · A
When l 2 O 3 exceeds 5% by weight, the fluidity decreases and the flow loss also increases, so 4CaO · Al 2 O 3 · Fe 2
O 3 is 13% by weight or less, preferably 8% by weight or less,
3CaO.Al 2 O 3 is 5% by weight or less, preferably 4% by weight or less. Also when the 3CaO · SiO 2 in the remainder components increases, in other words, the less 2CaO · SiO 2, early strength increases but decreases the fluidity, since flow losses also increased, in order to improve the fluidity 2Ca
O.SiO 2 is 40% by weight or more in the balance, preferably 5
It is desirable to set it to 0 to 70% by weight. 2CaO / SiO
By increasing the content of 2 , a cement composition having low heat generation and high fluidity can be obtained.

【0009】本発明においては、セメント組成物中の全
石膏量を3〜7重量%とする。全石膏量が3重量%より
少ないと石膏量が不十分となり流動性の改善効果が小さ
くなるだけでなく、セメントの粉砕や水和後の収縮など
でも問題があり、7重量%を超えるとこわばりを生じ、
流動性が低下する。
In the present invention, the total amount of gypsum in the cement composition is 3 to 7% by weight. If the total amount of gypsum is less than 3% by weight, the amount of gypsum will be insufficient and the effect of improving the fluidity will not only be reduced, but there will also be problems such as crushing of cement and contraction after hydration. Results in
Liquidity decreases.

【0010】半水石膏の量も重要である。本発明では半
水石膏量を、全石膏に対して37重量%以上、且つ、セ
メント成分全体に対して2.5重量%以下含まれるよう
にする。後記実施例の結果からも明らかであるように、
半水石膏の量をこの範囲内に調整することにより、混練
直後フローが大幅に改善された、組成によっては300
mm以上の高流動性を有し、フローロスも殆どなく且
つ、材料分離も生じないセメント組成物を得ることがで
きる。
The amount of hemihydrate gypsum is also important. In the present invention, the amount of hemihydrate gypsum is 37% by weight or more based on the total gypsum and 2.5% by weight or less based on the entire cement components. As is clear from the results of Examples described below,
By adjusting the amount of hemihydrate gypsum within this range, the flow immediately after kneading was significantly improved.
It is possible to obtain a cement composition having high fluidity of mm or more, almost no flow loss, and no material separation.

【0011】石膏中の半水石膏量が37重量%未満で
は、3CaO・Al23の水和反応が速く流動性の改善
効果は期待できず、フローロスも大きくなる。また、セ
メント成分中の半水石膏含量が2.5重量%を超える
と、混練直後のフローが著しく小さくなり、高性能AE
減水剤の必要量が多くなり好ましくない。
When the amount of hemihydrate gypsum in the gypsum is less than 37% by weight, the hydration reaction of 3CaO.Al 2 O 3 is fast, the effect of improving the fluidity cannot be expected, and the flow loss becomes large. Further, if the content of hemihydrate gypsum in the cement component exceeds 2.5% by weight, the flow immediately after kneading becomes remarkably small, resulting in high performance AE.
It is not preferable because the required amount of the water reducing agent increases.

【0012】無水石膏が含まれるとフローが改善される
が、その量が多すぎると、混練直後のフローがかえって
小さくなるだけでなく、フローロスも大きくなる。従っ
て、本発明において、石膏中に含まれる不溶性無水石膏
量は35重量%以下とする。
[0012] If anhydrous gypsum is included, the flow is improved, but if the amount is too large, not only the flow immediately after kneading becomes rather small, but also the flow loss becomes large. Therefore, in the present invention, the amount of insoluble anhydrous gypsum contained in gypsum is 35% by weight or less.

【0013】本発明において、石膏はクリンカーと同時
に粉砕しても、また予め粉砕したクリンカーに石膏粉を
混合する方法で加えても充分な流動性を示すが、クリン
カーと同時に粉砕した方がより高い流動性を示すので好
ましい。
In the present invention, gypsum exhibits sufficient fluidity even if it is ground at the same time as the clinker, or if it is added by a method in which gypsum powder is mixed with a previously ground clinker. It is preferable because it shows fluidity.

【0014】本発明のセメント組成物において、セメン
ト成分のブレーン比表面積は3000〜4500cm2
/g、好ましくは3800〜4200cm2/gにする
のが良い。ブレーン比表面積が低いほど流動性は良好で
あるが、ブレーン比表面積が3000cm2/g未満で
は粘度が低くなりすぎて材料分離を引き起こし、また4
500cm2/gを超えると減水剤の効果が低下し、セ
メント粒子の分散性が悪くなり流動性が低下するので、
上記範囲が好適である。
In the cement composition of the present invention, the Blaine specific surface area of the cement component is 3000 to 4500 cm 2.
/ G, preferably 3800 to 4200 cm 2 / g. The lower the Blaine specific surface area, the better the fluidity, but if the Blaine specific surface area is less than 3000 cm 2 / g, the viscosity becomes too low to cause material separation.
If it exceeds 500 cm 2 / g, the effect of the water-reducing agent will decrease, the dispersibility of cement particles will deteriorate, and the fluidity will decrease.
The above range is preferable.

【0015】また、本発明において、セメント成分のn
値は1.05以下とするのが好ましい。n値は小さくな
るとセメントの充填率が向上し、流動性は良好となる。
セメントのn値は、粉砕機の種類を変えたり、ボールミ
ルのボール径を変えたり粉砕助剤を添加したり、また、
粉砕時に分級工程を入れることで調整することができ
る。
In the present invention, the cement component n
The value is preferably 1.05 or less. When the n value is small, the filling rate of the cement is improved and the fluidity is improved.
The n value of the cement can be changed by changing the type of crusher, changing the ball diameter of the ball mill, adding a grinding aid,
It can be adjusted by adding a classification step during pulverization.

【0016】高性能AE減水剤の添加量は、セメント成
分100重量部に対して0.05〜5重量部、好ましく
は0.1〜2重量部である。高性能AE減水剤はその量
が増すに連れて水量を低減させ、セメント粒子の分散を
良好にして流動性を付与し、硬化後の特性を向上させる
作用をするが、その量が少なすぎると、減水剤としての
効果が期待できず、また多すぎても流動性増大には寄与
せず、むしろ材料分離を引き起こし、硬化後の特性が低
下する。
The amount of the high performance AE water reducing agent added is 0.05 to 5 parts by weight, preferably 0.1 to 2 parts by weight, based on 100 parts by weight of the cement component. The high-performance AE water-reducing agent reduces the amount of water as its amount increases, improves the dispersion of cement particles, imparts fluidity, and improves the properties after curing, but if the amount is too small, However, the effect as a water-reducing agent cannot be expected, and if it is too large, it does not contribute to the increase in fluidity, but rather causes material separation and deteriorates the properties after curing.

【0017】高性能AE減水剤としては、従来モルタル
やコンクリートに使用されている例えばナフタレン系
(ナフタレンスルホン酸ホルマリン縮合物等)、メラミ
ン系(メラミンスルホン酸ホルマリン縮合物等)、アミ
ノスルホン酸系(芳香族アミノスルホン酸ポリマー
等)、ポリカルボン酸系(ポリカルボン酸エーテル等)
を挙げることができる。
As the high-performance AE water reducing agent, for example, naphthalene type (naphthalene sulfonic acid formalin condensate etc.), melamine type (melamine sulfonic acid formalin condensate etc.), amino sulfonic acid type ( Aromatic amino sulfonic acid polymer etc.), polycarboxylic acid type (polycarboxylic acid ether etc.)
Can be mentioned.

【0018】また、本発明の高流動性セメント組成物は
水に加えて、硬化促進剤、硬化遅延剤、収縮低減剤、鉄
筋防錆剤等、公知の添加剤や膨張材等の特殊混和材を添
加しても何等問題を生じない
In addition to water, the high-fluidity cement composition of the present invention is a known additive such as a hardening accelerator, a hardening retarder, a shrinkage-reducing agent, a reinforcing bar rust inhibitor, and a special admixture such as an expanding material. Does not cause any problems

【0019】[0019]

【発明の実施の形態】DETAILED DESCRIPTION OF THE INVENTION

【実施例】以下に具体例を示して本発明を更に詳しく説
明する。 (1)モルタルの混練 JIS R5201 10.4.3の機械練りによる方
法に記されている装置、器具を使用して次のように行っ
た。練り鉢にセメント800gと砂(相馬砂)1280
gを入れ、ホバートミキサーで30秒間低速で混合し
た。ホバートミキサーを停止し、所定量の高性能AE減
水剤[ポリカルボン酸系:エヌエムビー社製、商品名レ
オビルドSP−8S(B)]を添加した水240gを加
えて低速で2分間練混ぜた。その後、ミキサーを停止
し、20秒間で、匙で練り鉢及びパドルに付着したモル
タルを掻き落とすとともに、練り鉢の底のモルタルを掻
きあげるように2〜3回掻き混ぜた。その後、再び低速
で2分40秒練り混ぜた。なお、水セメント比は0.
3、砂セメント比は1.6である。
The present invention will be described in more detail with reference to specific examples. (1) Kneading of mortar This was carried out as follows using the device and equipment described in the method of mechanical kneading of JIS R5201 10.4.3. 800g cement and sand (Soma sand) 1280 in a mortar
g and mixed at low speed with a Hobart mixer for 30 seconds. The Hobart mixer was stopped, and 240 g of water containing a predetermined amount of a high-performance AE water reducing agent [polycarboxylic acid type: manufactured by NM, trade name Rheobirde SP-8S (B)] was added, and the mixture was kneaded at low speed for 2 minutes. Then, the mixer was stopped, and the mortar adhering to the kneading bowl and the paddle was scraped off with a spoon for 20 seconds, and the mortar on the bottom of the kneading bowl was stirred for 2 to 3 times. Then, the mixture was mixed again at low speed for 2 minutes and 40 seconds. The water cement ratio was 0.
3, the sand cement ratio is 1.6.

【0020】(2)セメント成分のn値測定 レーザー回折式粒度分布測定機[商品名:SKレーザ
ー、(株)セイシン企業製]を用いて測定した粒度分布
測定値から、Rosin-Rammler 式を使って算出した。尚、
算出に用いた粒度は6〜32μmである。
(2) Measurement of n-value of cement component The Rosin-Rammler formula is used from the measured value of the particle size distribution measured using a laser diffraction type particle size distribution measuring instrument [trade name: SK laser, manufactured by Seishin Enterprise Co., Ltd.] Calculated. still,
The particle size used for the calculation is 6 to 32 μm.

【0021】(3)混練直後のフロー測定 JIS R5201「セメントの物理試験方法」に規定
されているフローコーンを用いて、0打でのフロー値を
測定した。フロー値は、240mm以上の値であれば好
ましく、フロー値が240mm未満では流動性が劣るた
め高性能AE減水剤を多量に添加する必要があり、施工
性の面で難がある。
(3) Flow Measurement Immediately after Kneading Using a flow cone specified in JIS R5201 "Cement physical test method", the flow value at 0 stroke was measured. The flow value is preferably a value of 240 mm or more, and when the flow value is less than 240 mm, the fluidity is poor, so that it is necessary to add a large amount of the high-performance AE water reducing agent, which is difficult in terms of workability.

【0022】(4)120分後フロー(フローロス)測
定 混練したモルタルを湿封し、120分後のフローを測定
し、フローロスを次式で計算した。 フローロス(%)=[{(混練直後のフロー)−(120
分後のフロー)}/(混練直後のフロー)]×100 フローロスが20%を超えるものは施工中に所定の施工
性が保持できないことから好ましいとはいえず、フロー
ロスが20%以下のものを良とした。
(4) Measurement of flow (flow loss) after 120 minutes The kneaded mortar was wet-sealed, the flow after 120 minutes was measured, and the flow loss was calculated by the following formula. Flow loss (%) = [{(flow immediately after kneading)-(120
Flow after minute)} / (flow immediately after kneading)] × 100 Flow loss exceeding 20% cannot be said to be preferable because predetermined workability cannot be maintained during construction, and flow loss below 20% is not preferable. It was good.

【0023】なお、以降の説明では、クリンカー中の2
CaO・SiO2をC2S、3CaO・Al23をC
3A、4CaO・Al23・Fe23をC4AFとそれぞ
れ略して記載する。また、残部はそのほとんどが3Ca
O・SiO2であるので、その構成成分の詳細について
の記載は省略してある。
In the following description, 2 in the clinker is used.
CaO ・ SiO 2 is C 2 S, 3CaO ・ Al 2 O 3 is C
3 A, describes 4CaO · Al 2 O 3 · Fe 2 O 3 for short C 4 AF respectively. Most of the balance is 3Ca
Since it is O.SiO 2 , the detailed description of its constituent components is omitted.

【0024】実施例1〜4及び比較例1、2 66%のC2S、3%のC3A、12%のC4AF及び残
部がC3Sからなるクリンカーに二水石膏或いは半水石
膏をセメント成分の3.0%添加後、石膏が脱水しない
ように注意しながら小型ボールミルで粉砕し、石膏とし
て二水石膏だけを含むブレーン比表面積が3250cm
2/gのセメントAと、石膏として半水石膏だけを含む
ブレーン比表面積が3200cm2/gのセメントBを
得た。この二種のセメントA、Bを混合して、表1の実
施例1〜4及び比較例1、2に示す、無水石膏を含ま
ず、半水石膏含量の互いに異なるセメントを調製した。
このセメントに、高性能AE減水剤をセメントの1.8
重量%添加してモルタルを調製し、混練直後のフロー
と、120分後のフローロスを測定した。結果を表1に
示す。
Examples 1 to 4 and Comparative Examples 1 and 2 A clinker consisting of 66% C 2 S, 3% C 3 A, 12% C 4 AF and the balance C 3 S was added to gypsum dihydrate or hemihydrate. After adding 3.0% of the cement component to gypsum, crush it with a small ball mill, taking care not to dehydrate the gypsum, and the brane specific surface area containing only gypsum dihydrate is 3250 cm.
A cement B having a Blaine specific surface area of 3200 cm 2 / g containing only 2 g of cement A and gypsum hemihydrate gypsum was obtained. These two types of cements A and B were mixed to prepare cements shown in Examples 1 to 4 and Comparative Examples 1 and 2 of Table 1 which do not contain anhydrous gypsum and have different hemihydrate gypsum contents.
A high performance AE water reducing agent is added to this cement 1.8
A mortar was prepared by adding it in a weight percentage, and the flow immediately after kneading and the flow loss after 120 minutes were measured. The results are shown in Table 1.

【0025】[0025]

【表1】 [Table 1]

【0026】実施例5、6及び比較例3、4 二水石膏含量または半水石膏含量をセメント成分の5.
0重量%とした以外は実施例1〜4、比較例1、2と同
様の方法でブレーン比表面積が3150cm2/gであ
り、石膏として二水石膏だけを含むセメントCと、ブレ
ーン比表面積が3100cm2/gで石膏として半水石
膏だけを含むセメントDを得た。一方、無水石膏を加
え、石膏としては無水石膏のみをセメント成分の5.0
重量%含むブレーン比表面積が3150cm2/gのセ
メントEを調製した。この三種のセメントC、D、Eを
混合して、表1の実施例5、6及び比較例3、4に示す
半水石膏含量および無水石膏含量を有するセメントを
得、実施例1〜4、比較例1、2と同様の方法で流動特
性を評価した。結果は表1に示す。
In Examples 5 and 6 and Comparative Examples 3 and 4, the dihydrate gypsum content or hemihydrate gypsum content was set to 5.
Blaine specific surface area is 3150 cm 2 / g in the same manner as in Examples 1 to 4 and Comparative Examples 1 and 2 except that it is 0% by weight, and the cement C containing only dihydrate gypsum as gypsum and the Blaine specific surface area are Cement D containing only hemihydrate gypsum as gypsum at 3100 cm 2 / g was obtained. On the other hand, add anhydrous gypsum, and use only anhydrous gypsum as the cement component of 5.0
A cement E having a Blaine specific surface area of 3150 cm 2 / g, which was included in a weight percentage, was prepared. These three types of cements C, D and E were mixed to obtain cements having hemihydrate gypsum content and anhydrous gypsum content shown in Examples 5 and 6 and Comparative Examples 3 and 4 of Table 1, and Examples 1 to 4 and The flow characteristics were evaluated by the same method as in Comparative Examples 1 and 2. The results are shown in Table 1.

【0027】実施例7及び比較例5 二水石膏量または半水石膏量をセメントの5.0重量%
とした以外は実施例1〜4、比較例1、2と同様の方法
でブレーン比表面積が4450cm2/gであり石膏と
して二水石膏だけを含むセメントFと、ブレーン比表面
積が4400cm2/gで石膏として半水石膏だけを含
むセメントGを得た。この二種のセメントF、Gを混合
して、表1の実施例7及び比較例5に示す半水石膏量の
セメントを得、このセメントに、高性能AE減水剤をセ
メントの2.0重量%添加してモルタルを調製し、実施
例1〜4、比較例1、2と同様の方法で流動特性を評価
した。結果は表1に示す。
Example 7 and Comparative Example 5 The amount of gypsum dihydrate or gypsum hemihydrate was 5.0% by weight of cement.
Cement F having a Blaine specific surface area of 4450 cm 2 / g and containing only gypsum dihydrate as gypsum, and Blaine specific surface area of 4400 cm 2 / g in the same manner as in Examples 1 to 4 and Comparative Examples 1 and 2 except that Cement G containing only hemihydrate gypsum as gypsum was obtained. These two types of cements F and G were mixed to obtain a cement having the amount of hemihydrate gypsum shown in Example 7 and Comparative Example 5 in Table 1. A high-performance AE water reducing agent was added to the cement in an amount of 2.0% by weight of the cement. % To prepare a mortar, and the flow characteristics were evaluated by the same method as in Examples 1 to 4 and Comparative Examples 1 and 2. The results are shown in Table 1.

【0028】実施例8 クリンカーを、56%のC2S、3%のC3A、12%の
4AF及び残部がC3Sからなるものに変え、二水石膏
含量或いは半水石膏含量をセメント成分の5.0重量%
に変えた以外は実施例1〜4と同じ方法で、ブレーン比
表面積が3300cm2/gで石膏として二水石膏だけ
を含むセメントHと、ブレーン比表面積が3250cm
2/gで石膏として半水石膏だけを含むセメントIを得
た。この二種のセメントH、Iを混合して、表1の実施
例8に示す、半水石膏含量を有するセメントを調製し、
実施例1〜4及び比較例1、2と同様の方法で流動特性
を評価した。結果は表1に示す。
Example 8 The clinker was changed to 56% C 2 S, 3% C 3 A, 12% C 4 AF and the balance C 3 S, and the dihydrate gypsum content or hemihydrate gypsum content was used. 5.0% by weight of cement component
In the same manner as in Examples 1 to 4 except that the cement H having a Blaine specific surface area of 3300 cm 2 / g and containing only gypsum dihydrate as gypsum, and a Blaine specific surface area of 3250 cm 2.
Cement I containing only hemihydrate gypsum as gypsum at 2 / g was obtained. The two cements H and I were mixed to prepare a cement having a hemihydrate gypsum content as shown in Example 8 of Table 1,
The flow characteristics were evaluated in the same manner as in Examples 1 to 4 and Comparative Examples 1 and 2. The results are shown in Table 1.

【0029】実施例9 n値の大きなセメントを得るために、ボールミルのボー
ル径を変えて粉砕したこと以外は実施例1〜4と同様の
方法で、ブレーン比表面積が3300cm2/gで石膏
として二水石膏だけを含むセメントJと、ブレーン比表
面積が3200cm2/gで石膏として半水石膏だけを
含むセメントKを得た。この二種のセメントJ、Kを混
合して、表1の実施例9に示す、半水石膏含量を有する
セメントを調製し、実施例1〜4、及び比較例1、2と
同様の方法で流動特性を評価した。結果は表1に示す。
Example 9 A plaster having a Blaine specific surface area of 3300 cm 2 / g was prepared in the same manner as in Examples 1 to 4 except that the ball was crushed by changing the ball diameter of a ball mill to obtain cement having a large n value. A cement J containing only gypsum dihydrate and a cement K containing only hemihydrate gypsum as gypsum with a Blaine specific surface area of 3200 cm 2 / g were obtained. These two types of cements J and K were mixed to prepare a cement having a hemihydrate gypsum content shown in Example 9 of Table 1, and treated in the same manner as in Examples 1 to 4 and Comparative Examples 1 and 2. The flow properties were evaluated. The results are shown in Table 1.

【0030】表1の結果から分かるように、本発明の方
法によるセメント組成物は何れも、混練直後のフロー値
は240mm以上と高く、且つ、120分後のフローロ
スも20%以下と低い、特性的に優れたものである。特
に、セメント成分のn値が1.05より小さいもので
は、混練直後のフロー値が260mm以上と非常に高
く、特性的に非常に優れたものが得られる。これに比し
て半水石膏量が本発明の範囲を外れるセメント組成物で
は、混練直後のフロー値は何れも200mm以下と低
く、また、120分後のフローロスが高くなる場合も出
てくる。表1の結果はまた、無水石膏が存在しなくて
も、半水石膏量が本発明の範囲にあれば特性的に高いも
のが得られること、及び、ある程度の無水石膏の存在に
より混練直後フロー値が改善されるが、多くなりすぎる
と逆に混練直後フロー値が低下することも示している。
As can be seen from the results shown in Table 1, all the cement compositions prepared by the method of the present invention have a flow value immediately after kneading as high as 240 mm or more and a flow loss after 120 minutes as low as 20% or less. It is excellent. In particular, when the n value of the cement component is less than 1.05, the flow value immediately after kneading is as high as 260 mm or more, and the one excellent in characteristics is obtained. On the other hand, in a cement composition having an amount of gypsum hemihydrate outside the range of the present invention, the flow value immediately after kneading is as low as 200 mm or less, and the flow loss after 120 minutes becomes high in some cases. The results in Table 1 also show that even if anhydrous gypsum is not present, a characteristically high value can be obtained if the amount of hemihydrate gypsum is within the range of the present invention, and the flow immediately after kneading due to the presence of some anhydrous gypsum. Although the value is improved, it is also shown that the flow value immediately after kneading decreases if the amount becomes too large.

【0031】[0031]

【発明の効果】本発明によるセメント組成物は、極めて
高い流動性を発現し、フローロスも小さく施工作業中等
に流動性が損なわれることがないという顕著な効果があ
る。
EFFECTS OF THE INVENTION The cement composition according to the present invention has a remarkable effect that it exhibits extremely high fluidity, has a small flow loss, and is not impaired in fluidity during construction work.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平6−80456(JP,A) 特開 平6−199549(JP,A) 特開 平7−144941(JP,A) 特開 平8−183636(JP,A) 特開 平2−80355(JP,A) 特開 昭61−251545(JP,A) 特開 昭64−28254(JP,A) 特表 平10−512841(JP,A) (58)調査した分野(Int.Cl.7,DB名) C04B 28/02 - 28/16 C04B 22/08 - 22/16 C04B 7/02 - 7/06 C04B 7/52 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-6-80456 (JP, A) JP-A-6-199549 (JP, A) JP-A-7-144941 (JP, A) JP-A-8- 183636 (JP, A) JP 2-80355 (JP, A) JP 61-251545 (JP, A) JP 64-28254 (JP, A) JP 10-512841 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) C04B 28/02-28/16 C04B 22/08-22/16 C04B 7/02-7/06 C04B 7/52

Claims (3)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】13重量%以下の4CaO・Al23・F
23、5重量%以下の3CaO・Al23を含み、残
部が3CaO・SiO2及び2CaO・SiO2よりなる
クリンカーと3〜7重量%の石膏で構成され、半水石膏
量が全石膏に対して37重量%以上且つセメント成分全
体に対して2.5重量%以下であり、無水石膏量が全石
膏に対して35重量%以下である、ブレーン比表面積が
3000〜4500cm2/gのセメント成分に更に高
性能AE減水剤を添加した高流動性セメント組成物。
1. A 13 wt% 4CaO · Al 2 O 3 · F
include e 2 O 3, 5 wt% or less of 3CaO · Al 2 O 3, balance is composed of clinker and 3-7% gypsum consisting 3CaO · SiO 2 and 2CaO · SiO 2, hemihydrate gypsum weight 37% by weight or more with respect to the total gypsum and 2.5% by weight or less with respect to the entire cement component, the amount of anhydrous gypsum is 35% by weight or less with respect to the total gypsum, and the Blaine specific surface area is 3000 to 4500 cm 2 / A high fluidity cement composition in which a high performance AE water reducing agent is further added to the cement component of g.
【請求項2】残部中の2CaO・SiO2量が残部の4
0〜70重量%である、請求項1に記載の高流動性セメ
ント組成物。
2. The amount of 2CaO.SiO 2 in the balance is 4 of the balance.
The high fluidity cement composition according to claim 1, which is 0 to 70% by weight.
【請求項3】セメント成分のn値が1.05以下であ
る、請求項1および2に記載の高流動性セメント組成
物。
3. The high fluidity cement composition according to claim 1, wherein the cement component has an n value of 1.05 or less.
JP31209196A 1996-11-22 1996-11-22 High fluidity cement composition Expired - Lifetime JP3385884B2 (en)

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Country Link
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