JPH10272618A - Manufacture of concrete - Google Patents
Manufacture of concreteInfo
- Publication number
- JPH10272618A JPH10272618A JP9498797A JP9498797A JPH10272618A JP H10272618 A JPH10272618 A JP H10272618A JP 9498797 A JP9498797 A JP 9498797A JP 9498797 A JP9498797 A JP 9498797A JP H10272618 A JPH10272618 A JP H10272618A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- mineral
- water
- powder
- fine 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 55
- 239000011707 mineral Substances 0.000 claims abstract description 55
- 239000004568 cement Substances 0.000 claims abstract description 39
- 238000004898 kneading Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000010881 fly ash Substances 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 16
- 230000000740 bleeding effect Effects 0.000 abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000004576 sand Substances 0.000 description 7
- 239000011398 Portland cement Substances 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 6
- 239000010883 coal ash Substances 0.000 description 5
- 239000002956 ash Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001603 reducing effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- -1 as described above Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
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)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、良好な流動性を
有し、ブリーディング特性および強度発現に優れるコン
クリートの製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing concrete having good fluidity and excellent bleeding characteristics and strength.
【０００２】[0002]
【従来の技術】近年、フライアッシュや高炉スラグ微粉
末、シリカ質微粉末等の鉱物質微粉末は、コンクリート
用混和材として、例えば、フライアッシュを適量添加す
ることによりコンクリートのワーカビリティーが向上
し、養生期間中にポゾラン反応が促進してコンクリート
組織が緻密化し、長期強度が向上する。あるいは、水和
発熱を緩和する。また、鉱物質微粉末をセメントの外割
りで多量に混用した場合には、粉体量が非常に多くな
り、粘性が高く、作業性がやや悪化するものの、材料分
離抵抗性が増す。などの効果が得られることから、これ
を積極的に活用する動きが見られる。2. Description of the Related Art In recent years, mineral ash such as fly ash, blast furnace slag fine powder, and siliceous fine powder has been improved as a concrete admixture, for example, by adding an appropriate amount of fly ash to improve the workability of concrete. During the curing period, the pozzolanic reaction is promoted, the concrete structure is densified, and the long-term strength is improved. Alternatively, the heat of hydration is reduced. In addition, when a large amount of fine mineral powder is mixed with cement, the amount of the powder becomes extremely large, the viscosity is high, and the workability is slightly deteriorated, but the material separation resistance is increased. Since such effects are obtained, there is a movement to actively utilize this.
【０００３】一方、従来から、コンクリートの製造に関
しては、セメント、砂、砂利等を所定の割合で均一に混
合し、次いで水と混合し、混練する方法が行われてき
た。すなわち、これらの使用材料を十分に混練し、均質
なコンクリートとすることに尽力してきた。しかしなが
ら、鉱物質微粉末を多量に混入したコンクリートの場
合、粉体量が非常に多く、作業性改善のために多量の高
性能混和剤を必要とするほか、ブリーディングが増加
し、強度低下を起こすなど、前記鉱物質微粉末の混合効
果を損なうおそれがあるなど、必ずしも均質に分布した
コンクリートが最良であるとは限らない。[0003] On the other hand, conventionally, in the production of concrete, a method of uniformly mixing cement, sand, gravel, and the like at a predetermined ratio, then mixing with water, and kneading has been performed. That is, efforts have been made to sufficiently knead these used materials to obtain a homogeneous concrete. However, in the case of concrete containing a large amount of fine mineral powder, the amount of powder is extremely large, requiring a large amount of high-performance admixture to improve workability, bleeding increases, and strength decreases. For example, there is a possibility that the mixing effect of the mineral substance fine powder may be impaired, and concrete distributed uniformly is not always the best.
【０００４】[0004]
【発明が解決しようとする課題】この発明は、セメン
ト、骨材、鉱物質微粉末、及び、水を用いて製造するコ
ンクリート、中でも鉱物質微粉末を多量に用いるコンク
リートにおいて、混練の際の材料投入順序を調整するこ
とにより、前述の欠点、特にブリーディング特性を改善
し、より高性能を有するコンクリートの製造方法を提供
することを目的とする。SUMMARY OF THE INVENTION The present invention relates to a method of mixing cement, aggregate, mineral powder, and concrete produced by using water, especially concrete using a large amount of mineral powder in kneading. It is an object of the present invention to improve the above-mentioned drawbacks, particularly the bleeding characteristics, and to provide a method for producing concrete having higher performance by adjusting the charging order.
【０００５】[0005]
【課題を解決するための手段】上述の目的を達成するた
めに、この発明のコンクリートの製造方法によれば、鉱
物質微粉末を多量に混合するコンクリートの製造方法に
おいて、予め骨材と一次水を混練する工程と、セメント
を混合する工程と、鉱物質微粉末を混合する工程と、残
部の水（二次水）を添加して混練する工程を備えること
（請求項１）、鉱物質微粉末を多量に混合するコンクリ
ートの製造方法において、予め骨材と一次水を混練する
工程と、セメントと鉱物質微粉末を混合する工程と、残
部の水（二次水）を添加して混練する工程を備えること
（請求項２）、セメントと鉱物質微粉末を混合する工程
が、セメントと鉱物質微粉末の一部を混合する工程と、
鉱物質微粉末の残部を混合する工程からなること（請求
項３）、一次水が使用骨材量に対して５〜８重量％であ
ること（請求項４）、混和剤を一次水及び二次水のそれ
ぞれに添加すること（請求項５）、混和剤を二次水のみ
に添加すること（請求項６）、鉱物質微粉末が天然鉱物
質微粉末、または人工鉱物質微粉末の１種以上であるこ
と（請求項７）、鉱物質微粉末がフライアッシュである
こと（請求項８）、を特徴とする。以下、この発明を詳
しく説明する。In order to achieve the above object, according to the method for producing concrete of the present invention, in a method for producing concrete in which a large amount of fine mineral powder is mixed, an aggregate and primary water are first prepared. Kneading, mixing cement, mixing fine mineral powder, and adding and kneading the remaining water (secondary water) (claim 1). In a method for producing concrete in which a large amount of powder is mixed, a step of kneading aggregate and primary water in advance, a step of mixing cement and fine mineral powder, and a kneading process by adding the remaining water (secondary water). Providing a step (claim 2), wherein the step of mixing the cement and the mineral fine powder includes the step of mixing a part of the cement and the mineral fine powder;
The method comprises the step of mixing the remaining portion of the mineral powder (claim 3), the primary water is 5 to 8% by weight based on the amount of aggregate used (claim 4), and the admixture is mixed with primary water and secondary water. Adding to each of the secondary waters (claim 5), adding the admixture to the secondary water only (claim 6), wherein the mineral fine powder is a natural mineral fine powder or an artificial mineral fine powder. It is characterized in that it is at least a seed (claim 7), and the mineral fine powder is fly ash (claim 8). Hereinafter, the present invention will be described in detail.
【０００６】[0006]
【発明の実施の形態】この発明は、鉱物質微粉末を多量
に混合するコンクリートにおいて、特に好適に適用され
るものであり、鉱物質微粉末としては、セメント粒子と
ほぼ同程度の粒径を有する各種岩石粉末、珪藻土、天然
ポゾラン等の天然鉱物質微粉末あるいは、高炉スラグ微
粉末やフライアッシュ、シリカ微粉末等の人工鉱物質微
粉末のいずれも用いることができる。中でも大部分が埋
め立て等に廃棄処分されるフライアッシュの使用は、資
源リサイクルの面からも好適に使用される。ここで石炭
灰は、ＪＩＳで規定される範囲はもちろんのこと、通常
原粉と称されるフライアッシュやシンダーアッシュをも
含むものである。DETAILED DESCRIPTION OF THE INVENTION The present invention is particularly suitably applied to concrete in which a large amount of mineral fine powder is mixed. The mineral fine powder has a particle size substantially equal to that of cement particles. Any of various kinds of rock powder, diatomaceous earth, natural mineral powder such as natural pozzolan, or artificial mineral powder such as blast furnace slag fine powder, fly ash and silica fine powder can be used. Among them, the use of fly ash, which is mostly disposed of in landfills, is preferably used from the viewpoint of resource recycling. Here, the coal ash includes not only the range specified by JIS but also fly ash and cinder ash which are usually called raw powder.
【０００７】このような鉱物質微粉末の使用量は、鉱物
質微粉末／粉体比（セメントと鉱物質微粉末の合計量）
として３０〜７０体積％が好ましい、これが７０体積％
を上回ると、セメントペーストの粘性及び付着性が高
く、鉱物質微粉末のベアリング効果により緩やかに流動
するものの、ワーカビリティーが非常に悪化する。この
場合、高性能減水剤の添加量を増加することによりペー
ストの流動性は向上するが、過剰の添加は材料分離を引
き起こす。また、鉱物質微粉末／粉体比が３０体積％を
下回ると、この発明の混合効果が少なく、これを適用す
る必要がない。同様に、コンクリート１ｍ3 中のセメン
トと鉱物質微粉末の合計量である単位粉体量は、１３０
〜２５０リットル/m3 の範囲とすることが好ましい。The amount of the fine mineral powder used is determined by the ratio of fine mineral powder / powder (total amount of cement and fine mineral powder).
Is preferably 30 to 70% by volume, and this is 70% by volume.
When the viscosity exceeds the above range, the viscosity and adhesion of the cement paste are high, and the cement paste flows slowly due to the bearing effect of the fine mineral powder, but the workability is extremely deteriorated. In this case, the fluidity of the paste is improved by increasing the amount of the high-performance water reducing agent added, but excessive addition causes material separation. On the other hand, when the ratio of the fine mineral powder / powder is less than 30% by volume, the mixing effect of the present invention is small, and it is not necessary to apply the same. Similarly, the unit powder amount, which is the total amount of cement and mineral fine powder in 1 m 3 of concrete, is 130
It is preferably in the range of ２５０250 l / m 3 .
【０００８】使用されるセメントには、普通、早強、超
早強、中庸熱、耐硫酸塩、白色等の各種ポルトランドセ
メントが含まれるが、初期並びに長期強度発現性の改善
に大きな効果を発揮するためには、望ましくは普通ポル
トランドセメントあるいは早強ポルトランドセメントが
適当である。また、フライアッシュセメント等の混合セ
メントを用いることもできる。[0008] Cement used includes various Portland cements such as ordinary, fast-strength, ultra-fast-strength, moderate heat, sulfate-resistant, and white, etc., and exerts a great effect on improvement of initial and long-term strength development. To do so, ordinary Portland cement or early Portland cement is suitably used. Further, a mixed cement such as fly ash cement can be used.
【０００９】次ぎに、鉱物質微粉末を多量に混合するに
当たり、高性能減水剤を添加することが好ましい。高性
能減水剤としては、従来よりモルタル及びコンクリート
用混和剤として用いられている、例えばアルキルアリル
系、ナフタリン系、メラミン系、トリアジン系の化学組
成を有するものであればいずれも使用できるが、好まし
くはポリカルボン酸塩系の混和剤が良好である。また、
空気連行性能を有する高性能ＡＥ減水剤ないし空気連行
剤も使用することができる。これら高性能減水剤の添加
量は使用するポルトランドセメント、骨材、鉱物質微粉
末及び所要の減水効果などを勘案して調整されるが、一
般には、ポルトランドセメント１００重量部に対して
０．１〜１０重量％が適当である。０．１重量％未満で
は減水効果が実質上無くまた１０重量％を超えて添加し
ても減水性、流動性の改善効果が頭打ちとなる。Next, it is preferable to add a high-performance water reducing agent when mixing a large amount of the fine mineral powder. As the high-performance water reducing agent, conventionally used as an admixture for mortar and concrete, for example, alkyl allyl type, naphthalene type, melamine type, any can be used as long as it has a triazine-based chemical composition, preferably Is preferably a polycarboxylate-based admixture. Also,
High performance AE water reducers or air entrainers with air entrainment performance can also be used. The addition amount of these high-performance water reducing agents is adjusted in consideration of Portland cement to be used, aggregate, fine powder of mineral matter, required water reducing effect, and the like. In general, 0.1 to 0.1 part by weight of Portland cement is used. 10 to 10% by weight is suitable. If it is less than 0.1% by weight, the effect of reducing water is practically nil.
【００１０】なお、この発明のコンクリートの製造方法
には、以上の配合成分のほかに、通常、コンクリートに
おいて用いられる急硬・急結材、高強度混和剤、水和促
進剤、凝結調整剤等の各種コンクリート混和材料や補強
材としての各種繊維、鋼等も使用することができる。[0010] In the method for producing concrete of the present invention, in addition to the above-mentioned components, a rapid hardening / rapid setting material usually used in concrete, a high-strength admixture, a hydration accelerator, a setting modifier, etc. Various concrete admixture materials, various fibers as a reinforcing material, steel and the like can also be used.
【００１１】骨材としては、細骨材として、珪砂や砕砂
のほか、各種の人工（軽量）砂、さらには、川砂や山砂
等の天然砂が使用でき、また、粗骨材として、砕石や天
然砂利のほか、フライアッシュ質人工骨材等が使用でき
る。コンクリートにおいて、１m3あたりの単位粗骨材量
は３００〜５５０リットル／m3が好ましく、３５０〜４００
リットル／m3の範囲がより好ましい。これが５５０リットル／m3
を上回ると骨材が相互に噛み合いがちになり、後述する
この発明の混合方法を用いて良好なセメントペーストを
作成しても、スランプ上部が崩れ落ちてしまう。また、
３００リットル／m3を下回ると、コンクリート中のモルタル
が占める割合が多くなり、所要の流動性を得るための混
和剤添加量を増加させなければならなくなる。As the aggregate, fine sand, crushed sand, various artificial (light) sands, and natural sands such as river sand and mountain sand can be used as fine aggregates. In addition to ash and natural gravel, fly ash artificial aggregate can be used. In concrete, the unit coarse aggregate per 1 m 3 is preferably 300 to 550 l / m 3, 350 to 400
The range of liter / m 3 is more preferred. This is 550 liters / m 3
When the ratio exceeds the above, aggregates tend to mesh with each other, and even if a good cement paste is prepared using the mixing method of the present invention described later, the upper part of the slump collapses. Also,
Below 300 liters / m 3 , the proportion of mortar in the concrete increases and the amount of admixture added to obtain the required fluidity must be increased.
【００１２】上述したような各種材料、特に鉱物質微粉
末を多量に混合するコンクリートにおいて、前述したよ
うに、セメント、砂、砂利等を所定の割合で均一に混合
し、次いで、水と混合、混練して均質なコンクリートと
するする方法では、ブリーディングが増加し、強度低下
を起こすなど、必ずしも満足なコンクリートを製造する
ことができない。[0012] In concrete containing a large amount of various materials as described above, particularly mineral fine powder, as described above, cement, sand, gravel and the like are uniformly mixed at a predetermined ratio, and then mixed with water. In the method of kneading to obtain a homogeneous concrete, it is not always possible to produce a satisfactory concrete because the bleeding increases and the strength decreases.
【００１３】そこで、この発明では、まず、細骨材およ
び粗骨材と一次水を混練した後、セメントを混合し所定
時間混練後、鉱物質微粉末を混合するか、あるいは、セ
メントと鉱物質微粉末を混合する。その後、残部の水
（二次水）を添加して混練することによりコンクリート
を製造する。すなわち、まず一次水により、骨材界面に
水・セメント比の低いペーストを形成させ、その後、残
りの水（二次水）を添加してコンクリートを製造するも
のである。このように、材料投入順序を変更することに
より、とくに骨材の界面付近の水・セメント比が低くな
るようにコンクリート組成に偏りを持たせることで効果
的にブリーディング特性を改善することができる。尚、
セメントと鉱物質微粉末は、セメントと鉱物質微粉末の
一部を混合して、次いで所定時間混練後、鉱物質微粉末
の残部を混合してもよい。Therefore, according to the present invention, first, fine and coarse aggregates and primary water are kneaded, then cement is mixed and kneaded for a predetermined time, and then mineral powder is mixed, or cement and mineral powder are mixed. Mix the fine powder. Then, concrete is manufactured by adding and kneading the remaining water (secondary water). That is, first, a paste having a low water / cement ratio is formed at the aggregate interface with primary water, and then the remaining water (secondary water) is added to produce concrete. As described above, the bleeding characteristics can be effectively improved by changing the material input sequence and imparting a bias to the concrete composition so that the water / cement ratio particularly near the interface of the aggregates is reduced. still,
The cement and the mineral fine powder may be obtained by mixing a part of the cement and the mineral fine powder, kneading the mixture for a predetermined time, and then mixing the remaining portion of the mineral fine powder.
【００１４】ここで、一次水量としては、使用骨材量に
対して５〜８重量％が好ましい。これが、５重量％未
満、あるいは、８重量％を越えるとブリーディング特性
及び強度発現の改善効果が少ない。Here, the amount of primary water is preferably 5 to 8% by weight based on the amount of aggregate used. If it is less than 5% by weight or more than 8% by weight, the effect of improving the bleeding characteristics and strength is small.
【００１５】また、前記高性能減水剤、空気連行剤等の
混和剤は、一次水及び二次水のそれぞれに添加するか、
あるいは、混和剤を二次水のみに添加することが好まし
い。一次水に添加する場合は、二次水と同濃度以下にな
るように添加することにより、セメントおよび鉱物質微
粉末への混和剤の吸着が低下されるので好ましい。以
下、実施例によりこの発明をさらに説明する。The admixture such as the high-performance water reducing agent and the air entraining agent is added to each of the primary water and the secondary water,
Alternatively, it is preferable to add the admixture only to the secondary water. When added to the primary water, it is preferable to add the primary water so as to have the same concentration or less as that of the secondary water since the adsorption of the admixture to the cement and the fine mineral powder is reduced. Hereinafter, the present invention will be further described with reference to examples.
【００１６】[0016]
【実施例】下記に示す材料を用いて表１に示す配合よ
り、コンクリートを調整した。 使用材料 セメント ：普通ポルトランドセメント 鉱物質微粉末 ：石炭灰原粉（火力発電所産） 比重：２．２１ 細骨材 ：陸砂（静岡産）、比重（表乾）：２．５９ 粗粒率：２．７５、実積率：６８．２ 粗骨材 ：砕石２００５（茨城産）、比重（表乾）：２．６４ 粗粒率：６．６６、実積率：６１．５ 高性能ＡＥ減水剤：竹本油脂社製 商品名 ０ＮＤ−１１ 空気量調整剤 ：東邦化学社製 商品名 ＯＥ−２０２EXAMPLES Concrete was prepared from the following materials using the following materials. Materials used Cement: ordinary Portland cement Mineral fine powder: coal ash raw powder (from thermal power plant) Specific gravity: 2.21 Fine aggregate: land sand (from Shizuoka), specific gravity (table dry): 2.59 Coarse grain rate: 2.75, actual volume ratio: 68.2 coarse aggregate: crushed stone 2005 (from Ibaraki), specific gravity (table drying): 2.64 coarse particle ratio: 6.66, actual volume ratio: 61.5 high-performance AE water reduction Agent: manufactured by Takemoto Yushi Co., Ltd. 0ND-11 Air volume regulator: manufactured by Toho Chemical Co., Ltd. OE-202
【００１７】[0017]
【表１】 [Table 1]
【００１８】コンクリートの調整は、図１に示すよう
に、 Ａ法；粗骨材（Ｇ）、細骨材（Ｓ）、セメント（Ｃ）、
及び石炭灰（ＣＡ）を同時に混合した後、水（Ｗ）を添
加して混練りしたもの。 Ｂ法；粗骨材（Ｇ）、細骨材（Ｓ）、及び一次水（Ｗ
１）を混練した後、セメント、鉱物質微粉末を順次混合
して、二次水（Ｗ２）を添加して混練したもの。 Ｃ法；粗骨材（Ｇ）、細骨材（Ｓ）、及び一次水（Ｗ
１）を混練した後、セメント及び鉱物質微粉末を混合す
ると共に、所定時間混練後、鉱物質微粉末の残部を混合
後、二次水（Ｗ２）を添加して混練したもの。 の３種類の方法により、材料投入順序をかえて混練する
と共に、Ｂ法及びＣ法については、表２に示す各水準の
一次水（Ｗ１）量、及び、二次水（Ｗ２）量により行っ
た、次いで、各コンクリートのスランプ、空気量、ブリ
ーディング量、凝結および圧縮強度を測定した。尚、混
練は、パン型強制ミキサ（５０Ｌ）を用い、コンクリー
トのスランプを１８０±２５mm、空気量を４．５±１．
５％を目標に混和剤量を一次水（Ｗ１）、及び二次水
（Ｗ２）それぞれ同濃度となるように調整し、試験を行
った。試験結果を表３に示す。As shown in FIG. 1, the concrete is prepared by a method A; coarse aggregate (G), fine aggregate (S), cement (C),
And coal ash (CA) mixed at the same time, then water (W) is added and kneaded. B method; coarse aggregate (G), fine aggregate (S), and primary water (W
After kneading 1), cement and mineral fine powder are sequentially mixed, and secondary water (W2) is added and kneaded. C method; coarse aggregate (G), fine aggregate (S), and primary water (W
After kneading 1), cement and mineral fine powder are mixed, and after kneading for a predetermined time, the remaining mineral fine powder is mixed, and then secondary water (W2) is added and kneaded. The kneading is performed by changing the material input order by the three types of methods described above, and the method B and the method C are performed using the primary water (W1) amount and the secondary water (W2) amount at each level shown in Table 2. Then, the slump, air amount, bleeding amount, setting and compressive strength of each concrete were measured. The kneading was carried out using a pan-type forced mixer (50 L) with a concrete slump of 180 ± 25 mm and an air volume of 4.5 ± 1.
The test was conducted by adjusting the amount of the admixture so that the primary water (W1) and the secondary water (W2) had the same concentration, with a target of 5%. Table 3 shows the test results.
【００１９】[0019]
【表２】 [Table 2]
【００２０】[0020]
【表３】 [Table 3]
【００２１】表３において、この発明によると、ブリー
ディング率を大幅に低減することができる。中でも、ブ
リーディング率および強度を総合判断すると、使用骨材
量に対して５〜８重量％の一次水と粗骨材・細骨材の混
練を行い、次いで、セメントと石炭灰を同時に投入後、
二次水を添加する方法（実施例９、１０）が最適であっ
た。In Table 3, according to the present invention, the bleeding rate can be greatly reduced. Among them, when the bleeding rate and the strength are comprehensively judged, the primary water and the coarse and fine aggregates are kneaded in an amount of 5 to 8% by weight based on the amount of the aggregate used, and then the cement and the coal ash are simultaneously charged,
The method of adding secondary water (Examples 9, 10) was optimal.
【００２２】[0022]
【発明の効果】この発明のコンクリートの製造方法は、
材料投入順序を調整することにより、従来の材料投入方
法による混練と比較して、ブリーディング特性が改善さ
れ、硬化コンクリートにおいては、骨材部分とペースト
部分の付着が強化され、強度増進が得られる。また、こ
の発明は、材料投入順序の調整による極めて簡単な方法
であり、実機プラントにおいても容易に実施可能であ
る。The method for producing concrete according to the present invention comprises:
By adjusting the material input sequence, bleeding characteristics are improved as compared with kneading by the conventional material input method, and in hardened concrete, the adhesion between the aggregate portion and the paste portion is enhanced, and strength is enhanced. Further, the present invention is a very simple method by adjusting the material charging order, and can be easily implemented in an actual plant.
【図１】コンクリートの製造方法を説明するフローチャ
ートである。FIG. 1 is a flowchart illustrating a method for producing concrete.
Claims (8)
ートの製造方法において、予め骨材と一次水を混練する
工程と、セメントを混合する工程と、鉱物質微粉末を混
合する工程と、残部の水（二次水）を添加して混練する
工程を備えることを特徴とするコンクリートの製造方
法。1. A method for producing concrete in which a large amount of mineral fine powder is mixed, a step of previously kneading aggregate and primary water, a step of mixing cement, a step of mixing fine mineral powder, and a balance A process of adding and kneading water (secondary water).
ートの製造方法において、予め骨材と一次水を混練する
工程と、セメントと鉱物質微粉末を混合する工程と、残
部の水（二次水）を添加して混練する工程を備えること
を特徴とするコンクリートの製造方法。2. A method for producing concrete in which a large amount of fine mineral powder is mixed, a step of kneading aggregate and primary water in advance, a step of mixing cement and fine mineral powder, and a step of mixing remaining water (secondary water). Water) and a step of kneading the mixture.
が、セメントと鉱物質微粉末の一部を混合する工程と、
鉱物質微粉末の残部を混合する工程からなることを特徴
とする請求項２に記載のコンクリートの製造方法。3. The step of mixing the cement and the mineral fine powder, the step of mixing a part of the cement and the mineral fine powder,
The method for producing concrete according to claim 2, comprising a step of mixing the remaining portion of the fine mineral substance powder.
％であることを特徴とする請求項１〜３のいずれかに記
載のコンクリートの製造方法。4. The method for producing concrete according to claim 1, wherein the amount of primary water is 5 to 8% by weight based on the amount of aggregate used.
添加することを特徴とする請求項１〜４のいずれかに記
載のコンクリートの製造方法。5. The method for producing concrete according to claim 1, wherein an admixture is added to each of the primary water and the secondary water.
徴とする請求項１〜４のいずれかに記載のコンクリート
の製造方法。6. The method for producing concrete according to claim 1, wherein the admixture is added only to the secondary water.
は人工鉱物質微粉末の１種以上であることを特徴とする
請求項１〜６のいずれかに記載のコンクリートの製造方
法。7. The method for producing concrete according to claim 1, wherein the mineral fine powder is at least one of natural mineral fine powder and artificial mineral fine powder.
とを特徴とする請求項７に記載のコンクリートの製造方
法。8. The method for producing concrete according to claim 7, wherein the mineral fine powder is fly ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9498797A JP3974970B2 (en) | 1997-03-28 | 1997-03-28 | Concrete production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9498797A JP3974970B2 (en) | 1997-03-28 | 1997-03-28 | Concrete production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10272618A true JPH10272618A (en) | 1998-10-13 |
| JP3974970B2 JP3974970B2 (en) | 2007-09-12 |
Family
ID=14125249
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9498797A Expired - Lifetime JP3974970B2 (en) | 1997-03-28 | 1997-03-28 | Concrete production method |
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| Country | Link |
|---|---|
| JP (1) | JP3974970B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001225049A (en) * | 2000-02-16 | 2001-08-21 | Mitsui Constr Co Ltd | Method and device for producing material of construction having coal ash as main raw material |
| JP4668357B1 (en) * | 2010-08-12 | 2011-04-13 | リブコンエンジニアリング株式会社 | Split kneading method |
| JP4755731B1 (en) * | 2011-03-10 | 2011-08-24 | リブコンエンジニアリング株式会社 | Split kneading method |
| JP4781485B1 (en) * | 2011-02-02 | 2011-09-28 | リブコンエンジニアリング株式会社 | Split kneading method |
| JP5903180B1 (en) * | 2015-04-27 | 2016-04-13 | リブコンエンジニアリング株式会社 | Split kneading method and split kneading equipment |
| JP5903189B1 (en) * | 2015-11-24 | 2016-04-13 | リブコンエンジニアリング株式会社 | Split kneading method and split kneading equipment |
| JP2017047550A (en) * | 2015-08-31 | 2017-03-09 | 太平洋セメント株式会社 | Production method of cement composition |
| KR20230000214A (en) * | 2021-06-24 | 2023-01-02 | 고려대학교 산학협력단 | Method for manufacturing light-weight self-consolidating concrete using light-weight aggregate |
-
1997
- 1997-03-28 JP JP9498797A patent/JP3974970B2/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001225049A (en) * | 2000-02-16 | 2001-08-21 | Mitsui Constr Co Ltd | Method and device for producing material of construction having coal ash as main raw material |
| JP4668357B1 (en) * | 2010-08-12 | 2011-04-13 | リブコンエンジニアリング株式会社 | Split kneading method |
| JP2012035609A (en) * | 2010-08-12 | 2012-02-23 | Livecon Engineering Co Ltd | Double mixing construction method |
| JP4781485B1 (en) * | 2011-02-02 | 2011-09-28 | リブコンエンジニアリング株式会社 | Split kneading method |
| JP4755731B1 (en) * | 2011-03-10 | 2011-08-24 | リブコンエンジニアリング株式会社 | Split kneading method |
| JP5903180B1 (en) * | 2015-04-27 | 2016-04-13 | リブコンエンジニアリング株式会社 | Split kneading method and split kneading equipment |
| JP2017047550A (en) * | 2015-08-31 | 2017-03-09 | 太平洋セメント株式会社 | Production method of cement composition |
| JP5903189B1 (en) * | 2015-11-24 | 2016-04-13 | リブコンエンジニアリング株式会社 | Split kneading method and split kneading equipment |
| KR20230000214A (en) * | 2021-06-24 | 2023-01-02 | 고려대학교 산학협력단 | Method for manufacturing light-weight self-consolidating concrete using light-weight aggregate |
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|---|---|
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