JPH07115347B2 - Method for producing concrete containing silica fume - Google Patents
Method for producing concrete containing silica fumeInfo
- Publication number
- JPH07115347B2 JPH07115347B2 JP62016776A JP1677687A JPH07115347B2 JP H07115347 B2 JPH07115347 B2 JP H07115347B2 JP 62016776 A JP62016776 A JP 62016776A JP 1677687 A JP1677687 A JP 1677687A JP H07115347 B2 JPH07115347 B2 JP H07115347B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- silica fume
- aggregate
- water
- sand
- 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
- 239000004567 concrete Substances 0.000 title claims description 22
- 229910021487 silica fume Inorganic materials 0.000 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000004568 cement Substances 0.000 claims description 34
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000004576 sand Substances 0.000 claims description 15
- 238000004898 kneading Methods 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明はシリカフュームを混入したコンクリートの製造
方法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing concrete containing silica fume.
［従来技術とその問題点］ 一般に、高強度のコンクリートを造るには、水セメント
比を小さくしなければならないが、このように水セメン
ト比を小さくすると、ワーカビリチーを保つためにはセ
メント量が過大になり、過度の温度上昇などの問題が生
じて、ヒビ割れが発生する恐れも大きくなる。さらに、
コンクリートの単価が高くなる等の問題もある。例え
ば、スランプ18cm程度で480kg/cm2の強度のコンクリー
トでは、セメント量は450〜500kg/m3にも達し、これで
は温度上昇が著しく、また混練後のスランプダウンも大
きく、施工上の大きな問題が生じる。[Prior art and its problems] Generally, in order to build high-strength concrete, it is necessary to reduce the water-cement ratio. However, if the water-cement ratio is reduced in this way, the amount of cement is excessive in order to maintain workability. As a result, problems such as excessive temperature rise occur and cracks are more likely to occur. further,
There is also a problem that the unit price of concrete becomes high. For example, in concrete with a slump of about 18 cm and a strength of 480 kg / cm 2 , the amount of cement reaches 450 to 500 kg / m 3 , which causes a remarkable temperature rise and also causes a large slump down after kneading, which is a major problem in construction. Occurs.
［発明の目的］ 本発明は、上記従来の問題点を解決するためになされた
もので、その目的とするところは、通常の水セメント比
すなわち通常のセメント量で従来のものより強度を大幅
に上げることができ、流動性が大きく、ブリージングが
小さいシリカフューム混入ダブルミキシングコンクリー
トの製造方法を提供することにある。[Object of the Invention] The present invention has been made in order to solve the above-mentioned conventional problems, and an object of the present invention is to increase the strength to a greater extent than a conventional one with a normal water-cement ratio, that is, a normal cement amount. It is an object of the present invention to provide a method for producing a silica fume-containing double mixing concrete which can be raised, has a large fluidity, and has a small breathing.
［発明の構成］ 本発明のシリカフューム混入コンクリートは、骨材並び
に少なくとも該骨材周囲の造殻に必要なセメント及び水
を一次混練して、該骨材の周囲に硬いセメントペースト
の殻を形成せしめ、続いて、これに残りのセメント及び
水を混入して二次混練するコンクリート製造方法におい
て、上記二次混練時にシリカフュームを混入することを
特徴とするものである。[Structure of the Invention] The silica fume-mixed concrete of the present invention is a mixture of aggregate and at least cement and water necessary for shell-building around the aggregate, which is first kneaded to form a hard cement paste shell around the aggregate. Then, in the concrete manufacturing method in which the remaining cement and water are subsequently mixed into the mixture for secondary kneading, silica fume is mixed during the secondary kneading.
［実施例］ 以下、本発明の一実施例について図面を参照しながら説
明する。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１はセメント貯蔵槽、２は砂貯蔵槽で
あって、それぞれセメントＣおよび砂Ｓが貯蔵されてい
る。セメントＣは、一次セメント計量器３により後述す
る造殻に必要な量の一次セメントC1が計量され、また砂
は、砂計量器４により最終の砂セメント比（S/C）にな
るように計量されて、それぞれ一次ミキサー５に投入さ
れる。In FIG. 1, 1 is a cement storage tank, 2 is a sand storage tank, in which cement C and sand S are stored, respectively. As for the cement C, the primary cement measuring device 3 measures the amount of primary cement C 1 necessary for shell making described later, and the sand is adjusted by the sand measuring device 4 to the final sand cement ratio (S / C). It is weighed and put into the primary mixer 5, respectively.
さらに、上記一次ミキサー５には、水タンク６に貯水さ
れている水が一次水計量器７により適当な一次水セメン
ト比（W1/C）となるように計量されて給水される。Further, the water stored in the water tank 6 is measured and supplied to the primary mixer 5 by the primary water meter 7 so as to have an appropriate primary water cement ratio (W 1 / C).
これらの砂・一次セメント・一次水は、上記一次ミキサ
ー５により一次混練される。この際、一次セメントと一
次水により硬いセメントペーストが造られ、この硬いセ
メントペーストが、第２図（Ａ）に示すように、砂Ｓの
周囲を被覆して殻８を形成する。The sand, primary cement and primary water are primarily kneaded by the primary mixer 5. At this time, a hard cement paste is produced by the primary cement and the primary water, and this hard cement paste covers the periphery of the sand S to form the shell 8 as shown in FIG. 2 (A).
以上のようにして造殻されたセメントモルタルは下段の
二次ミキサー９に投入される。The cement mortar shelled as described above is put into the secondary mixer 9 in the lower stage.
該二次ミキサー９には、砂利貯蔵槽10からの砂利Ｇが砂
利計量器11により適宜計量されて混入されると共に、最
終の砂セメント比（S/C）となるように、のこりの二次
セメントC2（Ｃ−C1）が二次砂計量器12により計量さ
れ、また最終の水セメント比（W/C）となるように、残
りの二次水W2（Ｗ−W1）が二次水計量器13により計量さ
れて給水される。該二次水W2には途中シリカフューム14
が混入される。このシリカフューム14は、例えば半導体
の製造過程で産出される副産物のように、粒径が約0.1
μの球形を成しており、従来から廃材として廃棄されて
いたものが、本発明により有効利用されるようになっ
た。Gravel G from the gravel storage tank 10 is appropriately weighed and mixed into the secondary mixer 9 by the gravel meter 11, and the secondary slag is added so that the final sand cement ratio (S / C) is obtained. Cement C 2 (C-C 1 ) is weighed by the secondary sand meter 12, and the remaining secondary water W 2 (W-W 1 ) is adjusted so that the final water cement ratio (W / C) is obtained. The secondary water meter 13 measures and supplies water. Silica fume 14 in the middle of the secondary water W 2
Is mixed in. The silica fume 14 has a particle size of about 0.1, such as a by-product produced in the semiconductor manufacturing process.
The spherical shape of μ, which has been conventionally discarded as a waste material, has been effectively used by the present invention.
以上のように二次ミキサー９に投入された造殻セメント
モルタルと砂利Ｇと二次セメントと二次水W2とシリカフ
ューム14とは、二次ミキサー９により二次混練されて、
第２図（Ｂ）に示すような性状のいわゆる造殻コンクリ
ートができあがる。As described above, the shell-making cement mortar, the gravel G, the secondary cement, the secondary water W 2, and the silica fume 14, which have been charged into the secondary mixer 9, are secondarily kneaded by the secondary mixer 9,
A so-called shell concrete having properties as shown in FIG. 2 (B) is completed.
尚、15は硬化促進剤や遅延剤などの混和剤槽、16はその
混和剤計量器である。上記実施例では、一次ミキサー５
により砂Ｓ等のいわゆる細骨材について造殻処理した
が、本発明はこれに限定するものではなく、一次ミキサ
ー５の混練能力を高めて砂利Ｇ等の粗骨材についても造
殻混練してもよい。In addition, 15 is an admixture tank for curing accelerators and retarders, and 16 is an admixture meter. In the above embodiment, the primary mixer 5
The so-called fine aggregate such as sand S was shell-kneaded by the above method, but the present invention is not limited to this, and the kneading ability of the primary mixer 5 is increased so that coarse aggregate such as gravel G is also shell-kneaded. Good.
次に、本発明の方法により製造したシリカフューム混入
コンクリートと従来のコンクリートとの比較を表にして
示す。Next, a table showing a comparison between silica fume-mixed concrete produced by the method of the present invention and conventional concrete is shown.
上記表により本発明のシリカフューム混入コンクリート
は、水セメント比が大きく（セメント量）が少なくても
十分な強度を発揮し得ることが解る。 From the above table, it is understood that the silica fume-mixed concrete of the present invention can exhibit sufficient strength even if the water-cement ratio is large (cement amount).
また、第３図は本発明のシリカフューム混入コンクリー
トと従来のコンクリートとの温度上昇を比較したグラフ
であり、本発明のシリカフューム混入コンクリートの温
度上昇が低いことが確認された。Further, FIG. 3 is a graph comparing the temperature rises of the concrete containing silica fume of the present invention and the conventional concrete, and it was confirmed that the temperature rise of the concrete containing silica fume of the present invention was low.
［発明の効果］ シリカフュームをダブルミキシングの二次混練時にのみ
混入させることにより、高価で高性能減水剤を必要とす
るシリカフュームをできるだけ少ない量で、しかも効果
的に、コンクリートの流動性と強度を向上せしめること
ができる。[Advantages of the Invention] By mixing silica fume only during the secondary mixing of double mixing, the amount of silica fume that requires an expensive and high-performance water reducing agent is improved as much as possible, and the fluidity and strength of concrete are effectively improved. It can be done.
第１図は本発明方法を実施するコンクリート製造プラン
トの概略図、第２図（Ａ）は造殻された一次セメントモ
ルタルの概念図、第２図（Ｂ）はシリカフューム混入ダ
ブルミキシングコンクリートの概念図、第３図は本発明
のシリカフューム混入コンクリートと従来のコンクリー
トとの温度上昇を比較したグラフである。 １……セメント貯蔵槽、２……砂貯蔵槽、３……セメン
ト計量器、４……砂計量器、５……一次ミキサー、６…
…水タンク、７……一次水計量器、８……殻、９……二
次ミキサー、10……砂利貯蔵槽、11……砂利計量器、12
……二次砂計量器、13……二次水計量器、14……シリカ
フューム、15……混和剤槽、16……混和剤計量器、Ｃ…
…セメント、C1……一次セメント、C2……二次セメン
ト、Ｇ……砂利、Ｓ……砂、Ｗ……水、W1……一次水、
W2……二次水。FIG. 1 is a schematic diagram of a concrete manufacturing plant for carrying out the method of the present invention, FIG. 2 (A) is a conceptual diagram of shell-cast primary cement mortar, and FIG. 2 (B) is a conceptual diagram of silica fume mixed double mixing concrete. FIG. 3 is a graph comparing the temperature rises of silica fume-mixed concrete of the present invention and conventional concrete. 1 ... Cement storage tank, 2 ... Sand storage tank, 3 ... Cement meter, 4 ... Sand meter, 5 ... Primary mixer, 6 ...
… Water tank, 7 …… Primary water meter, 8 …… Shell, 9 …… Secondary mixer, 10 …… Gravel storage tank, 11 …… Gravel meter, 12
…… Secondary sand meter, 13 …… Secondary water meter, 14 …… Silica fume, 15 …… Admixture tank, 16 …… Admixture meter, C…
… Cement, C 1 …… Primary cement, C 2 …… Secondary cement, G …… Gravel, S …… Sand, W …… Water, W 1 …… Primary water,
W 2 …… Secondary water.
Claims (3)
必要なセメント及び水を一次混練して、該骨材の周囲に
硬いセメントペーストの殻を形成せしめ、続いて、これ
に残りのセメント及び水を混入して二次混練するコンク
リート製造方法において、上記二次混練時にシリカフュ
ームを混入することを特徴とするシリカフューム混入コ
ンクリートの製造方法。1. A primary kneading mixture of cement and water required for the aggregate and at least a shell for forming the aggregate around the aggregate to form a hard cement paste shell around the aggregate, followed by the remaining residue. A method for producing concrete in which cement and water are mixed to carry out secondary kneading, wherein silica fume is mixed in during the secondary kneading.
とする前記特許請求範囲第１項に記載のシリカフューム
混入コンクリートの製造方法。2. The method for producing silica fume-mixed concrete according to claim 1, wherein the aggregate is a fine aggregate such as sand.
骨材であることを特徴とする前記特許請求の範囲第１項
に記載のシリカフューム混入コンクリートの製造方法。3. The method for producing silica fume-mixed concrete according to claim 1, wherein the aggregate is fine aggregate such as sand and coarse aggregate such as gravel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62016776A JPH07115347B2 (en) | 1987-01-27 | 1987-01-27 | Method for producing concrete containing silica fume |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62016776A JPH07115347B2 (en) | 1987-01-27 | 1987-01-27 | Method for producing concrete containing silica fume |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63183812A JPS63183812A (en) | 1988-07-29 |
| JPH07115347B2 true JPH07115347B2 (en) | 1995-12-13 |
Family
ID=11925602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62016776A Expired - Lifetime JPH07115347B2 (en) | 1987-01-27 | 1987-01-27 | Method for producing concrete containing silica fume |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07115347B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4723101B2 (en) * | 2001-02-23 | 2011-07-13 | 良隆 池田 | Concrete production method with increased entrained air ratio |
| JP7748664B2 (en) * | 2021-06-18 | 2025-10-03 | 住友大阪セメント株式会社 | Method for mixing concrete composition and method for producing concrete composition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61199910A (en) * | 1985-03-01 | 1986-09-04 | 大平洋機工株式会社 | Manufacture of concrete |
-
1987
- 1987-01-27 JP JP62016776A patent/JPH07115347B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| 笠井芳夫他編「セメント・コンクリート用混和材料」技術書院（昭６１−５−１５）Ｐ．１０１及び１０７ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63183812A (en) | 1988-07-29 |
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