JPH0354139A - Admixture material for concrete and production thereof - Google Patents
Admixture material for concrete and production thereofInfo
- Publication number
- JPH0354139A JPH0354139A JP1188935A JP18893589A JPH0354139A JP H0354139 A JPH0354139 A JP H0354139A JP 1188935 A JP1188935 A JP 1188935A JP 18893589 A JP18893589 A JP 18893589A JP H0354139 A JPH0354139 A JP H0354139A
- Authority
- JP
- Japan
- Prior art keywords
- silica
- admixture
- concrete
- containing material
- ultrafine
- 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
- 239000004567 concrete Substances 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 155
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 75
- 239000002245 particle Substances 0.000 claims abstract description 38
- 238000003756 stirring Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 239000010419 fine particle Substances 0.000 claims abstract description 14
- 239000010883 coal ash Substances 0.000 claims abstract description 11
- 238000009826 distribution Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 4
- 238000009834 vaporization Methods 0.000 claims abstract description 4
- 230000007062 hydrolysis Effects 0.000 claims abstract description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 3
- 238000000227 grinding Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 4
- 241000975357 Salangichthys microdon Species 0.000 claims 1
- 239000011372 high-strength concrete Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 239000004576 sand Substances 0.000 abstract description 2
- 239000003245 coal Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 22
- 238000012856 packing Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000010298 pulverizing process Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 241000207199 Citrus Species 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 235000020971 citrus fruits Nutrition 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011882 ultra-fine particle Substances 0.000 description 2
- 206010073150 Multiple endocrine neoplasia Type 1 Diseases 0.000 description 1
- 240000002834 Paulownia tomentosa Species 0.000 description 1
- 101100007331 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) COS3 gene Proteins 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は高強度やアルカリ骨材反応抑制や水密性が要求
される高品質コンクリート製造時に必要な混和材及びそ
の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an admixture necessary for producing high-quality concrete that requires high strength, suppression of alkaline aggregate reaction, and watertightness, and a method for producing the same.
従来のコンクリートは平均粒径（以下、ｄ５。 Conventional concrete has an average particle size (hereinafter referred to as d5).
と記す）２０〜３０μｍのセメントと粗骨材（砕石〉と
細骨材（砂）と混和剤及び水とを混合して作られている
が、圧縮強度が３００ｋｇｆ／ｃｎｔ程度しかない。し
かし最近は超高層ビルのＪｊＱ加などに伴い、高強度コ
ンクリートの需要が増加しており、１９７０年代からノ
ルウェーやデンマーク等でＳｌ０２含有量が多くて、ｄ
，。が１μｍ以下の超微粒シリカを数１０重量％の割合
でセメントに混合使用することにより圧縮強度が１ ０
０ ０ ｋｇｆ／ｃＪ以上の高強度コンクリートが製
造可能であることが確認されている。It is made by mixing 20-30 μm cement, coarse aggregate (crushed stone), fine aggregate (sand), admixture, and water, but its compressive strength is only about 300 kgf/cnt.However, recently The demand for high-strength concrete is increasing with the construction of skyscrapers such as JJQ, and since the 1970s, in Norway and Denmark, concrete with high Sl02 content has been increasing.
,. By mixing ultrafine silica with a particle diameter of 1 μm or less with cement at a ratio of several tens of weight percent, the compressive strength can be increased to 10.
It has been confirmed that high strength concrete of 0.0 kgf/cJ or more can be produced.
しかしながら、超微粒シリカは非常に高価格であるため
に、セメントに対して２０重量％混入したとしてもセメ
ント単価をかなり上げることになり、経済性の面から未
だ実用化されていないのが実状である。However, since ultrafine silica is very expensive, even if it is mixed in at 20% by weight with respect to cement, the unit price of cement will increase considerably, and the reality is that it has not yet been put into practical use due to economic reasons. be.
またサブミクロンの超微粒シリカは凝集性が非常に強い
ために、ハンドリング、特にセメントとの均一混合分散
が難しく、従来のコンクリート製造プロセスがそのまま
適用できないという問題がある。Furthermore, since submicron ultrafine silica has extremely strong cohesiveness, it is difficult to handle, especially to mix and disperse uniformly with cement, and conventional concrete manufacturing processes cannot be applied as is.
本発明は上記技術水準に鑑み、高価な超微粒シリカの使
用量を減じても十分高強度のコンクリートが得られるコ
ンクリート混和材及びその製造方法を提供しようとする
ものである。In view of the above-mentioned state of the art, the present invention aims to provide a concrete admixture and a method for producing the same, which allow concrete with sufficiently high strength to be obtained even if the amount of expensive ultrafine silica used is reduced.
本発明のコンクリート混和材は、機械的粉砕によって得
られるシリカ含有物の粉砕微粒と、シリカ含有物の高温
気化法あるいは加水分解法等によって得られる超微粒シ
リカを混合することにより２つの粒度分布をもってなる
コンクリート混和材である。そして、上記コンクリート
混和材において、シリカ含有物が石炭火力発電所で発生
する石炭灰や珪石、シラスであり、かつシリカ含有物の
粉砕微粒と超微粒シリカの平均粒径がそれぞれ１〜５μ
ｍと０、０５〜０．５μｍであるようにすること及び上
記コンクリート混和材をシリカ含有物の粉砕微粒と超微
粒シリカと水と混和剤とを混合してスラリー状とするこ
とを特に好ましい態様とするものである。The concrete admixture of the present invention has two particle size distributions by mixing pulverized fine particles of a silica-containing material obtained by mechanical crushing and ultrafine silica particles obtained by a high-temperature vaporization method or hydrolysis method of a silica-containing material. It is a concrete admixture. In the above concrete admixture, the silica-containing material is coal ash, silica stone, or shirasu generated in a coal-fired power plant, and the average particle size of the crushed fine particles and ultrafine silica of the silica-containing material is 1 to 5 μm, respectively.
A particularly preferred embodiment is that the concrete admixture is made into a slurry by mixing crushed fine particles of a silica-containing material, ultrafine silica, water, and an admixture with m and 0.05 to 0.5 μm. That is.
また、本発明のコンクＩＪ − ト混和柑の製造方法は
、シリカ含有物の粉砕微粒を湿式攪拌ミルで製造し、か
つ超微粒シリカと混和剤を該ミル人口で添加し、該ミル
内でシリカ含有物の粉砕と水、超微粒シリカ、混和剤の
混合を同時に行うコンクリート混和材の製造方法である
。そして、上記コンクリート混和材の製造方法において
、湿式攪拌ミルによる粉砕と混合を固形分濃度５０〜９
０重量％で行うようにすることを特に好ましい態様とす
るものである。In addition, the method for producing the conc IJ-to mixed citrus of the present invention involves producing pulverized fine particles of a silica-containing material in a wet stirring mill, adding ultrafine silica and an admixture in the mill population, and adding the silica-containing material in the mill. This is a method for producing concrete admixtures that involves simultaneously pulverizing the ingredients and mixing water, ultrafine silica, and admixtures. In the above concrete admixture manufacturing method, pulverization and mixing using a wet stirring mill is carried out at a solid content concentration of 50 to 9.
A particularly preferred embodiment is to use 0% by weight.
すなわち、本発明のコンクリート混和材は、セメントと
超微粒シリカの中間の粒径を有ずる安価で大量製造可能
なシリカ含有物の粉砕微粒（以下、これを単に粉砕シリ
カと記す）をコンクリート混和材原料として使用するこ
とによって高価な超微粒シリカの使用量を減らして、コ
ンクリート混和材のコストを下げると共に、最密充填理
論に基いてセメントに混合した場合に最も強度と施工性
（流動性）が向上ずる粒度分布を有するフニ／クリート
混和材としたものであり、また、本発明のコンクリート
混和材の製造方法は、超微４立シリカのハンドリング性
と分敗性を向上するために、湿式攪拌ミルでシリカ含有
物の粉砕と超微粒シリカと水と混和桐の混合分敗を同時
に行い、該４成分が十分混合分敗したスラリー状混和材
を製造する方法である。That is, the concrete admixture of the present invention uses crushed fine particles of a silica-containing material (hereinafter simply referred to as crushed silica), which has a particle size between cement and ultrafine silica and can be manufactured in large quantities at low cost, as a concrete admixture. By using it as a raw material, we can reduce the amount of expensive ultrafine silica used, lowering the cost of concrete admixtures, and achieve the highest strength and workability (fluidity) when mixed with cement based on the close-packing theory. The concrete admixture of the present invention is a concrete admixture having an improved particle size distribution, and the method for producing the concrete admixture of the present invention uses wet stirring to improve the handling and decomposition properties of ultrafine quaternary silica. This is a method for producing a slurry-like admixture in which the four components are sufficiently mixed and separated by simultaneously pulverizing a silica-containing material and mixing and separating ultrafine silica, water, and mixed paulownia in a mill.
超微粒シリカをセメントに混入するとコンクリートの強
度と流動性が向上する理由を第３図によって説明する。The reason why mixing ultrafine silica into cement improves the strength and fluidity of concrete will be explained with reference to Figure 3.
第３図は粒子充填モデルを示す模式図であり、第３図（
ａ）は従来のセメント粒子だけの充填モデル、第３図（
ｂ）はセメント粒子と超微粒シリカの充填モデル、第３
図（ｃ）は最密充填時の粒子直径を求める真球のモデル
、第３図（ｄ）は本発明のセメント粒子と粉砕シリカと
超微粒シリカの充填モデルを表わし、第３図中、ｌはセ
メント粒子、２は間隙水、３は超微粒シリカ、４は粉砕
シリカを示す。Figure 3 is a schematic diagram showing the particle packing model, and Figure 3 (
a) is a conventional filling model with only cement particles; Figure 3 (
b) is a filling model of cement particles and ultrafine silica, the third
Figure (c) shows a true sphere model for determining the particle diameter in the case of closest packing, and Figure 3 (d) shows a packing model of cement particles, ground silica, and ultrafine silica of the present invention. 2 indicates cement particles, 2 indicates pore water, 3 indicates ultrafine silica, and 4 indicates crushed silica.
超微粒シリカをセメントに混入すると、（１） 第３
図（ａ）のセメント粒子１の間の間隙水２を、第３図（
ｂ）の超微粒シリカ３が追い出し、粒子の緻密性が増し
、かつ５１［（駄な間隙水２が減り、流動媒体としての
水が増える（最密充填効果）
（２）真球に近い細い多数の超微粒シリカ粒子によるべ
了リング効果が生ずる
ことである。When ultrafine silica is mixed into cement, (1)
The pore water 2 between the cement particles 1 in Figure (a) is expressed in Figure 3 (
The ultrafine silica 3 in b) is expelled, the density of the particles increases, and 51 [(useless pore water 2 is reduced, and water as a fluid medium increases (closest packing effect)) (2) A thin particle close to a true sphere This is because a bellowing effect occurs due to the large number of ultrafine silica particles.
従って、コンクリートの強度や流動性を向上（以下、単
に、高品質化と記す）させるためには、最密充填を如何
に経済的に効率的に行わせるか）′大きな課題になる。Therefore, in order to improve the strength and fluidity of concrete (hereinafter simply referred to as "improvement of quality"), it becomes a big issue how to economically and efficiently perform close packing.
粒子が完全に真球の場合には、大きな粒径ｄ。If the particles are completely spherical, the particle size d is large.
のセメント粒子ｌの間隙を埋める小さな粒径の粒子４の
最大径ｄ１は、第３図（Ｃ）に示すように、（ｄ＋／
２ ＋ ｄｏ／ ２ ） ＣＯＳ３［１ ＝ ｄｏ／
２となるのでｄｌ＝ｄｏ／６．５である。As shown in FIG.
2 + do/2) COS3[1 = do/
2, so dl=do/6.5.
そこで本発明者らは、最密充填には１／６．５の等比級
数となる粒径分布の粒子群を混合するのが理論的に最適
であることに着目した。具体的にはセメント粒子のｄ，
。は２０〜３０μｍであり、また実際の粒子は真級では
なく、かつ粒度分布をもっているので、ｄｓｏが１〜５
μｍの微粒とｄ，。が０，０５〜０．５μｍの超微粒を
混合するのが最適であることを数多くの実験により確認
した。そして、前者の微粒として安価な粉砕シリカと後
者の超微粒として超微粒シリカを使用することにより、
高価な超微粒シリカの使用量を従来の約１／１０に低減
してもｆｉＩｆａ粒シリ力単独の場合と比較して同等以
上の品質のコンクリートが製造できることを確認した。Therefore, the present inventors focused on the fact that it is theoretically optimal to mix a particle group with a particle size distribution that is a geometric series of 1/6.5 for close packing. Specifically, d of cement particles,
. is 20 to 30 μm, and since the actual particles are not true grade and have a particle size distribution, the dso is 1 to 5.
μm fine particles and d,. It has been confirmed through numerous experiments that it is optimal to mix ultrafine particles with a diameter of 0.05 to 0.5 μm. By using inexpensive crushed silica as the former fine particles and ultrafine silica as the latter ultrafine particles,
It was confirmed that even if the amount of expensive ultrafine silica used was reduced to about 1/10 of the conventional amount, concrete of the same or higher quality could be produced compared to the case of fiIfa granule silica alone.
また前記のベアリング効果を発揮させるためには、超微
粒シリカが十分に分敗している必要があるが、超微粒シ
リカは比表面積が非常に大きく、凝集性が非常に強い。Further, in order to exhibit the above-mentioned bearing effect, ultrafine silica must be sufficiently broken down, but ultrafine silica has a very large specific surface area and has very strong agglomeration.
そこで本発明者らは湿式攪拌ミル入口に超微粒シリカと
水と分散用混和剤を添加し、湿式攪拌ミルでシリカ含有
物の粉砕と混合分散を同時に行うことによりこれを解決
した。The present inventors solved this problem by adding ultrafine silica, water, and a dispersion admixture to the inlet of a wet stirring mill, and simultaneously pulverizing and mixing and dispersing the silica-containing material in the wet stirring mill.
更に本発明ではコンクリート混和材を十分に混合分散し
たスラリー状混和祠としてコンクリート製造者に提供す
ることができるために従来のコンクリート製造工程を何
ら変えることなく容易に高品質コンクリートの製造が可
能である。Furthermore, the present invention can provide concrete manufacturers with a slurry mixture in which concrete admixtures are sufficiently mixed and dispersed, making it possible to easily manufacture high-quality concrete without changing the conventional concrete manufacturing process. .
前述の適正粒径をもった粉砕シリカと超微粒シリカとを
セメントに混合することにより、第３図（ｄ）に示すよ
うに、セメント粒子１間隙を粉砕シリカ４が埋め、この
粉砕シリカ４の間隙を超微粒シリカ３が埋めるので非常
に効率のよい最密充填が可能となる。By mixing the above-mentioned crushed silica and ultrafine silica having the appropriate particle size with cement, the crushed silica 4 fills the gaps between the cement particles 1 and the crushed silica 4, as shown in FIG. 3(d). Since the ultrafine silica 3 fills the gaps, very efficient close packing is possible.
本発明者らが先に提案した湿式攪拌ミルである粉砕装置
、すμわち、相対的に回転される外筒と内筒とを備え、
これら外筒と内筒との間を粉砕室とした粉砕装置、及び
該粉砕装置の外筒及び／又は内筒る翼を取付けた粉砕装
置（特願昭６１〜３８８１１号）を使用すると、湿式攪
拌ミル内では非常に強い剪断力が働くために、凝集超微
粒シリカは解離し、粒子表面は剪断力で活性化している
ので、同時に添加している混和剤が粒子表面に均一に吸
着するために非常に女定した分１１ｋ超微粒シリカが得
られる。The grinding device, which is a wet stirring mill previously proposed by the present inventors, includes an outer cylinder and an inner cylinder that are rotated relative to each other,
When using a crushing device with a crushing chamber between the outer cylinder and the inner cylinder, and a crushing device (Japanese Patent Application No. 1988-38811) equipped with blades for the outer cylinder and/or inner cylinder of the crushing device, wet type Due to the very strong shearing force that works in the stirring mill, the agglomerated ultrafine silica dissociates and the particle surface is activated by the shearing force, so the admixture added at the same time is evenly adsorbed on the particle surface. 11k ultra-fine silica can be obtained with a very high density.
更に湿式攪拌ミル出口では粉砕シリカとの混合も終了し
たスラリー状混和材となっているのでセメント、水、骨
材とこの混和材との混合分敗が非常にスムーズに行われ
る。Further, at the exit of the wet stirring mill, the slurry-like admixture has already been mixed with the pulverized silica, so that the mixing and separation of the admixture with cement, water, and aggregates is carried out very smoothly.
なお、前記湿式攪拌ミル内での粉砕は粒子同士が互いに
接触し、いわゆる粒子相互摩砕作用が大きい程粉砕性が
向上する。この摩砕作用を行わせるためには、湿式攪拌
ミル内の固形分濃度が５０ｗｔ％より低過ぎると粒子の
接触確率が低くなり、また濃度が９Ｑｗｔ％より高過ぎ
るとミル内の攪拌メディア（ボール）と固形分との共廻
り現象が生じ剪断力が低下する。このため、摩砕作用を
効果的に行わせる固形分濃度は５０〜９０重量％が適正
である。In addition, during the grinding in the wet stirring mill, the particles come into contact with each other, and the greater the so-called mutual grinding effect of the particles, the better the grindability. In order to perform this grinding action, if the solid content concentration in the wet stirring mill is too low than 50 wt%, the contact probability of particles will be low, and if the concentration is too high than 9 Qwt%, the stirring media (balls) in the mill will be reduced. ) and the solid content occur, and the shearing force decreases. Therefore, the appropriate solid content concentration for effectively performing the grinding action is 50 to 90% by weight.
以下本発明の一実施例を第１図によって説明する。 An embodiment of the present invention will be described below with reference to FIG.
第１図は本発明の混和材製造システムの実施例であり、
粉砕シリカ及び超微粒シリカの原科として石炭焚き火力
発電所で発生する石炭灰を使用し、高温気化法によって
得られた超微粒シリカを使用した例である。なお、石炭
灰以外にも日本各地で採れる珪石やシラスも本発明の原
料となる。FIG. 1 shows an embodiment of the admixture production system of the present invention,
This is an example in which coal ash generated in a coal-fired power plant is used as the raw material for pulverized silica and ultrafine silica, and ultrafine silica obtained by a high-temperature vaporization method is used. In addition to coal ash, silica and shirasu, which can be found throughout Japan, can also be used as raw materials for the present invention.
以下具体的に説明する。This will be explained in detail below.
原料ホッパ−１内の石炭灰は、フィーダ２によって供給
管３を通ってチューブミル５に送られる。チューブミル
５内には粉砕用ボールが充填されており、給水管４によ
り送られた水と一緒にｄ，。が１０μｍ程度に湿式１次
粉砕される。Coal ash in the raw material hopper 1 is sent to the tube mill 5 by a feeder 2 through a supply pipe 3. The tube mill 5 is filled with grinding balls, and together with the water sent through the water supply pipe 4, d. is first wet-pulverized to about 10 μm.
なお、必要に応じてチューブミル入口には薬注管ｌ８か
ら減水剤としての界面活性剤である混和剤（レ才ビルド
ＳＰ−９ＨＳ ：日四マスタービルダーズ社製）が供給
される。粉砕された石炭灰スラリーは排出管６よりコレ
クトタンク７へ送られ、ポンブ９により輸送管８．１０
を通って湿式攪拌ミル１１に送られて、ｄ，。が１〜５
μｍに微粉砕される。攪拌ミル１１の人口には混和剤タ
ンク１５、薬注管１４、ｌ７、ポンブ１６により混和剤
と超微粒ホッパ１９からフィーダ２０、供給管２１を通
って超微粒シリカが供給される。If necessary, an admixture (Resaibuild SP-9HS, manufactured by Nisshi Master Builders Co., Ltd.), which is a surfactant as a water reducing agent, is supplied to the inlet of the tube mill from the chemical injection pipe 18. The pulverized coal ash slurry is sent to the collection tank 7 from the discharge pipe 6, and then transferred to the transport pipe 8.10 by the pump 9.
d, and sent to the wet stirring mill 11 through d. is 1-5
Finely ground to μm. The stirring mill 11 is supplied with an admixture by an admixture tank 15, chemical injection pipes 14, 17, and pump 16, and ultrafine silica from an ultrafine hopper 19 through a feeder 20 and a supply pipe 21.
把拌ミル１１内には直径が数ｍｍから十数ｍｍのボール
が充満されており、攪拌翼（図示せず）により激しく運
転しており、このボールの運動により石炭灰が微粉砕さ
れると同時に、超微粒シリカと混和剤が混合分敗されて
、均一で安定した粉砕シリカと超微粒シリカと混和剤と
水とからなるコンクリート混和材が製造されて、輸送管
１２を通って製品タンク１３にＩＩ′Ｐ蔵される。The mixing mill 11 is filled with balls with diameters ranging from several mm to more than 10 mm, and is driven vigorously by stirring blades (not shown), and the movement of these balls pulverizes the coal ash. At the same time, the ultra-fine silica and the admixture are mixed and separated to produce a uniform and stable concrete admixture consisting of the pulverized silica, ultra-fine silica, the admixture and water, which is passed through the transport pipe 12 into the product tank 13. It is stored in II'P.
第２図は第１図の実施例に従い、把拌ミル１１内の固形
分濃度を変化した時の試験結果例である。なお、超微粒
シリカは石炭灰に対して１０重量％、混和剤は合計固形
分量に対して０．２５重量％添加した。FIG. 2 shows an example of test results when the solid content concentration in the stirring mill 11 was varied according to the embodiment shown in FIG. The ultrafine silica was added in an amount of 10% by weight based on the coal ash, and the admixture was added in an amount of 0.25% by weight based on the total solid content.
固形分濃度が５０ｗｔ％より低過ぎると粒子相互の摩砕
作用が低下し粉砕製が悪くなり、かつ粉砕動力原単位も
高い。逆に９０重量％以上の高濃度になると動力原単位
は低いが、スラリー粘度が高くなり過ぎてボールとスラ
リーの共廻り現象が始まり粉砕性が低下する。If the solid content concentration is too lower than 50 wt%, the mutual grinding action of particles will be reduced, resulting in poor pulverization quality, and the grinding power consumption rate will also be high. On the other hand, when the concentration is higher than 90% by weight, the power unit is low, but the viscosity of the slurry becomes too high, and a phenomenon in which the balls and slurry rotate together begins, resulting in a decrease in grindability.
以上、粉砕性と動力原単位から攪拌ミル内の固形分濃度
は５０〜９０重量％が適正であることが明らかになった
。As described above, it has been revealed that the appropriate solid content concentration in the stirring mill is 50 to 90% by weight from the viewpoint of crushability and power consumption.
第１表は第１図及び第２図の実施例に従い製造した混和
材を実際にセメントに混合し、コンクリートの強度評価
試験を実施した例である。Table 1 shows an example in which the admixture manufactured according to the example shown in FIGS. 1 and 2 was actually mixed with cement, and a concrete strength evaluation test was conducted.
なお、スランプ値（施工性）が一定の条件でテストを実
施した。第１表より本発明の混和材を２０％使用した場
合、混和材なしに比較して３倍以上強度が増加し、また
高価な超微粒シリカ単独の混和祠を２０％使用時と比較
して強度は若干上廻り、セメントコスト（混和祠コスト
を含む）が半分以下と安価である。The test was conducted under conditions where the slump value (workability) was constant. Table 1 shows that when 20% of the admixture of the present invention is used, the strength increases by more than three times compared to that without the admixture, and compared to when using 20% of the expensive admixture of ultrafine silica alone. The strength is slightly higher, and the cement cost (including the cost of the mixing stone) is less than half, making it cheaper.
以１二、本発明により、
（１）従来のセメントコストと殆んど同じでコンクリー
ト強度を３倍以上向上可能となる。12. According to the present invention, (1) Concrete strength can be increased by more than three times at almost the same cost as conventional cement.
（２） 同じ施工性（スランプ価）でも水／（セメン
ト→一混和材）比が小さい、即ち余分な水が少いために
ひび割れがまったくなく、かつ永和反応熱も低く押えら
れる。(2) Even with the same workability (slump value), the water/(cement→admixture) ratio is small, that is, there is little excess water, so there is no cracking at all, and the heat of eternal reaction is kept low.
（３）微粒子のべ了リング効果により水／（七メン１・
十混和材）が同じ場合には流動性が大巾に向上し、コン
クリートの長距離ポンプ輸送が可能となる。(3) Water/(Seven Men 1・
If the same admixtures are used, the fluidity will be greatly improved, making it possible to pump concrete over long distances.
（４）スラリー状混和材であるため品質が安定しており
、かつ従来のコンクリート製造工程がそのまま使える。(4) Since it is a slurry-like admixture, the quality is stable, and conventional concrete manufacturing processes can be used as is.
（５）般近石炭焚き火力発電所の増加に伴い急増してい
る石炭灰の大量有効利用が可能となる。(5) It will become possible to effectively utilize a large amount of coal ash, which is rapidly increasing with the increase in the number of general coal-fired power plants.
第１図は本発明の一実施例の混和柑製逍の工程図、第２
図は本発明の一実施例の湿式１｛１拌ミルの石炭灰粉砕
試験結果例を示す図表、第３図は粒子充填モデルを示す
模式図である。Figure 1 is a process diagram for making mixed citrus according to one embodiment of the present invention, and Figure 2 is
The figure is a chart showing an example of a coal ash crushing test result of a wet type 1{1 stirring mill according to an embodiment of the present invention, and FIG. 3 is a schematic diagram showing a particle filling model.
Claims (5)
微粒と、シリカ含有物の高温気化法あるいは加水分解法
等によって得られる超微粒シリカを混合することにより
２つの粒度分布をもってなることを特徴とするコンクリ
ート混和材。(1) It is characterized by having two particle size distributions by mixing pulverized fine particles of a silica-containing material obtained by mechanical grinding and ultrafine silica particles obtained by a high-temperature vaporization method or hydrolysis method of a silica-containing material. Concrete admixture.
や珪石、シラスであり、かつシリカ含有物の粉砕微粒と
超微粒シリカの平均粒径がそれぞれ１〜５μｍと０．０
５〜０．５μｍであることを特徴とする請求項（１）記
載のコンクリート混和材。(2) The silica-containing material is coal ash, silica stone, or whitebait generated in a coal-fired power plant, and the average particle diameters of the crushed fine particles and ultrafine silica of the silica-containing material are 1 to 5 μm and 0.0 μm, respectively.
The concrete admixture according to claim 1, wherein the concrete admixture has a thickness of 5 to 0.5 μm.
和剤とを混合し、スラリー状としてなることを特徴とす
る請求項（１）又は（２）記載のコンクリート混和材。(3) The concrete admixture according to claim (1) or (2), characterized in that it is made into a slurry by mixing crushed fine particles of a silica-containing material, ultrafine silica, water, and an admixture.
、かつ超微粒シリカと混和剤を該ミル入口で添加し、該
ミル内でシリカ含有物の粉砕と水、超微粒シリカ、混和
剤の混合を同時に行うことを特徴とするコンクリート混
和材の製造方法。(4) Pulverized fine particles of a silica-containing material are produced in a wet stirring mill, and ultrafine silica and an admixture are added at the inlet of the mill, and the silica-containing material is pulverized in the mill, water, ultrafine silica, and an admixture. A method for producing a concrete admixture characterized by simultaneously mixing.
〜９０重量％で行うことを特徴とする請求項（４）記載
のコンクリート混和材の製造方法。(5) Grinding and mixing with a wet stirring mill to a solid content concentration of 50
5. The method for producing a concrete admixture according to claim 4, characterized in that the amount is 90% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18893589A JP2755700B2 (en) | 1989-07-24 | 1989-07-24 | Manufacturing method of concrete admixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18893589A JP2755700B2 (en) | 1989-07-24 | 1989-07-24 | Manufacturing method of concrete admixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0354139A true JPH0354139A (en) | 1991-03-08 |
| JP2755700B2 JP2755700B2 (en) | 1998-05-20 |
Family
ID=16232475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18893589A Expired - Fee Related JP2755700B2 (en) | 1989-07-24 | 1989-07-24 | Manufacturing method of concrete admixture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2755700B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000128616A (en) * | 1998-10-16 | 2000-05-09 | Sumitomo Osaka Cement Co Ltd | Production of cement composition |
| JP2002321952A (en) * | 2001-04-26 | 2002-11-08 | Taiheiyo Cement Corp | Cement admixture |
| JP2008087468A (en) * | 2006-09-05 | 2008-04-17 | Eacle Kk | Method for manufacturing coal ash slurry for cement based composition and cement based composition |
| JP2009215139A (en) * | 2008-03-12 | 2009-09-24 | Kubota Matsushitadenko Exterior Works Ltd | Silica material, cement molded article, and method for producing cement molded article |
| WO2018143387A1 (en) * | 2017-02-02 | 2018-08-09 | 住友大阪セメント株式会社 | Concrete composition and method for manufacturing concrete composition |
| WO2018142660A1 (en) * | 2017-02-02 | 2018-08-09 | 住友大阪セメント株式会社 | Concrete composition and method for manufacturing concrete composition |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257233A (en) * | 1975-11-06 | 1977-05-11 | Nisso Master Builders Kk | Utilization method of granulated slag |
| JPS61117143A (en) * | 1984-11-13 | 1986-06-04 | 電気化学工業株式会社 | Slurry silica fume for admixing cement |
-
1989
- 1989-07-24 JP JP18893589A patent/JP2755700B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5257233A (en) * | 1975-11-06 | 1977-05-11 | Nisso Master Builders Kk | Utilization method of granulated slag |
| JPS61117143A (en) * | 1984-11-13 | 1986-06-04 | 電気化学工業株式会社 | Slurry silica fume for admixing cement |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000128616A (en) * | 1998-10-16 | 2000-05-09 | Sumitomo Osaka Cement Co Ltd | Production of cement composition |
| JP2002321952A (en) * | 2001-04-26 | 2002-11-08 | Taiheiyo Cement Corp | Cement admixture |
| JP2008087468A (en) * | 2006-09-05 | 2008-04-17 | Eacle Kk | Method for manufacturing coal ash slurry for cement based composition and cement based composition |
| JP2009215139A (en) * | 2008-03-12 | 2009-09-24 | Kubota Matsushitadenko Exterior Works Ltd | Silica material, cement molded article, and method for producing cement molded article |
| WO2018143387A1 (en) * | 2017-02-02 | 2018-08-09 | 住友大阪セメント株式会社 | Concrete composition and method for manufacturing concrete composition |
| WO2018142660A1 (en) * | 2017-02-02 | 2018-08-09 | 住友大阪セメント株式会社 | Concrete composition and method for manufacturing concrete composition |
| KR20190113526A (en) * | 2017-02-02 | 2019-10-08 | 스미토모 오사카 세멘토 가부시키가이샤 | Concrete compositions and methods of making concrete compositions |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2755700B2 (en) | 1998-05-20 |
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