JP2001062823A - Manufacture of concrete having early strength developing property - Google Patents
Manufacture of concrete having early strength developing propertyInfo
- Publication number
- JP2001062823A JP2001062823A JP24613899A JP24613899A JP2001062823A JP 2001062823 A JP2001062823 A JP 2001062823A JP 24613899 A JP24613899 A JP 24613899A JP 24613899 A JP24613899 A JP 24613899A JP 2001062823 A JP2001062823 A JP 2001062823A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- water reducing
- reducing agent
- performance
- early strength
- 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
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
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は，早期強度発現性を
有するコンクリートの製造方法，より詳しくは，高性能
ＡＥ減水剤を用いてコンクリートの早期強度を発現する
方法に関する。The present invention relates to a method for producing concrete having early strength development, and more particularly to a method for developing early strength of concrete using a high-performance AE water reducing agent.
【０００２】[0002]
【従来の技術】コンクリート施工において早期強度（初
期強度，若材齢強度とも呼ばれる）が特に必要とされる
ことがある。例えば，スリップフォーム工法（滑り型枠
工法，滑動型枠工法，スライディングフォーム工法とも
呼ばれる）のように，堰板（型枠）をスライディングさ
せながら打継ぎ目なしにコンクリートを打設する場合に
は，打設後数時間（例えば４〜５時間）で堰板が移動し
てコンクリート面が露出するので，この脱型時にコンク
リートが自立できるに十分な早期強度を有することが必
要になる。2. Description of the Related Art In concrete construction, early strength (also referred to as initial strength or early age strength) may be particularly required. For example, when concrete is poured without a joint while sliding a dam (form), as in the slip form method (also called a sliding form method, a sliding form method, or a sliding form method). A few hours (for example, 4 to 5 hours) after the installation, the weir plate moves and the concrete surface is exposed, so that it is necessary that the concrete has sufficient early strength to be able to stand by itself at the time of demolding.
【０００３】このように打設後数時間で或る程度の強度
を必要とするコンクリート施工の場合，かような早期強
度を得るための処法とし，従来より，次のような対策が
単独または複合して採用されてきた。 (1) 材料面での対策：混和剤として硬化促進剤を使用す
る（効果大）。早強セメントなどの早強性に優れたセメ
ントを使用する（効果小〜中）。 (2) コンクリート製造面での対策：練り混ぜ水に温水を
使用するなどして，練り上がり温度を上昇させる（効果
小〜中）。 (3) コンクリート施工面での対策：打設したコンクリー
トを投光器や温風器で加熱し，断熱シートで養生空間を
設けるなどして，加熱養生を行う（効果大）。[0003] In the case of concrete construction that requires a certain level of strength several hours after casting, a method for obtaining such early strength is used. Conventionally, the following countermeasures are used alone or separately. It has been adopted in combination. (1) Material measures: Use a curing accelerator as an admixture (effective). Use cement with excellent early strength such as early strength cement (small to medium effect). (2) Countermeasures for concrete production: Use warm water as the mixing water to raise the kneading temperature (low to medium effect). (3) Countermeasures for concrete construction: Heat the cured concrete by heating it with a floodlight or a hot air heater and providing a curing space with heat insulation sheets (effective effect).
【０００４】[0004]
【発明が解決しようとする課題】前記のような従来の手
法のうち，早期強度発現の効果の大きいものには，硬化
促進剤の使用と加熱養生が挙げられる。しかし，硬化促
進剤の使用は，コストアップのほかにスランプ保持時間
が短くなりやすいので施工性確保に問題がある。また加
熱養生の場合には，採暖等の加熱養生設備に費用が嵩む
とともに建設作業が煩雑になり，安全の確保や建設工程
に支障を与えるという問題があった。本発明はこのよう
な問題を解決することを目的としたものであり，非常に
簡単な処法で必要な早期強度を発現する方法を提供しよ
うとするものである。Among the conventional methods as described above, those which have a large effect of early strength development include use of a curing accelerator and curing by heating. However, the use of a hardening accelerator has a problem in securing workability because slump holding time tends to be short in addition to cost increase. In the case of heat curing, there is a problem in that the cost of heating and curing equipment for heating and the like is increased, and the construction work is complicated, so that safety is secured and the construction process is hindered. The present invention has been made to solve such a problem, and an object of the present invention is to provide a method for developing a necessary early strength by a very simple method.
【０００５】[0005]
【課題を解決するための手段】本発明者らは，高性能Ａ
Ｅ減水剤の使用の仕方によっては，その本来の流動化目
的とは異なり，コンクリートの早期強度を発現させるこ
とができることを見い出した。すなわち，流動化コンク
リートには高性能ＡＥ減水剤が使用されているが，この
流動化コンクリートに使用される高性能ＡＥ減水剤を分
割して添加すると，得られるコンクリートの初期強度が
高くなることがわかった。Means for Solving the Problems The present inventors have developed a high-performance A
It has been found that, depending on the use of the E water reducer, it is possible to express the early strength of concrete, unlike its original purpose of fluidization. In other words, high-performance AE water reducing agent is used in fluidized concrete, but if the high-performance AE water reducing agent used in this fluidized concrete is added in portions, the initial strength of the obtained concrete may increase. all right.
【０００６】したがって，本発明によれば，高性能ＡＥ
減水剤を一次添加してコンクリートを練り混ぜ，得られ
たコンクリートに高性能ＡＥ減水剤を二次添加して混合
することからなる，早期強度発現性を有するコンクリー
トの製造方法を提供する。具体的には，高性能ＡＥ減水
剤を配合してベースコンクリートを製造し，このベース
コンクリートをアジテータ車に積み込み，さらに高性能
ＡＥ減水剤を該コンクリートに添加することからなる，
早期強度発現性を有するコンクリートの製造方法を提供
する。さらに具体的には，生コンプラントにおいて高性
能ＡＥ減水剤を配合してスランプ５ｃｍ以上のベースコ
ンクリートを製造し，このベースコンクリートをアジテ
ータ車に積み込み，次いでアジテータ車内のベースコン
クリートに高性能ＡＥ減水剤を添加することからなる，
所要の施工性と早期強度発現性を有するコンクリートの
製造方法を提供する。Therefore, according to the present invention, a high performance AE
Provided is a method for producing concrete having early strength development, comprising a primary addition of a water reducing agent, kneading and mixing of concrete, and a secondary addition of a high-performance AE water reducing agent to the obtained concrete and mixing. Specifically, a high-performance AE water reducing agent is blended to produce a base concrete, the base concrete is loaded on an agitator wheel, and a high-performance AE water reducing agent is added to the concrete.
Provided is a method for producing concrete having early strength development. More specifically, a high-performance AE water reducing agent is blended in a ready-mixed plant to produce a base concrete with a slump of 5 cm or more, and this base concrete is loaded on an agitator vehicle. Consisting of adding
Provided is a method for producing concrete having required workability and early strength development.
【０００７】換言すれば，本発明は，高性能ＡＥ減水剤
を一次添加してコンクリートを練り混ぜ，得られたコン
クリートに高性能ＡＥ減水剤を二次添加してから打設す
ることを特徴とする高性能ＡＥ減水剤を用いたコンクリ
ートの早期強度発現法を提供する。具体的には，高性能
ＡＥ減水剤を配合してベースコンクリートを製造し，こ
のベースコンクリートを打設現場に搬送してからさらに
高性能ＡＥ減水剤を該コンクリートに配合することを特
徴とする高性能ＡＥ減水剤を用いたコンクリートの早期
強度発現法を提供する。より具体的には，生コンプラン
トにおいて高性能ＡＥ減水剤を配合してスランプ５ｃｍ
以上，好ましくは８ｃｍ以上，さらには８〜１５ｃｍの
ベースコンクリートを製造し，このベースコンクリート
をアジテータ車で打設現場に搬送し，次いでアジテータ
車内のベースコンクリートに高性能ＡＥ減水剤を添加し
てスランプ８ｃｍ以上，好ましくは１０ｃｍ以上，さら
には１５〜２１ｃｍの流動化コンクリートとし，この流
動化コンクリートを打設することからなる，高性能ＡＥ
減水剤を用いたコンクリートの早期強度発現法を提供す
る。[0007] In other words, the present invention is characterized in that a high-performance AE water reducing agent is first added, the concrete is kneaded, the high-performance AE water reducing agent is secondarily added to the obtained concrete, and then the concrete is poured. The present invention provides a method of early strength development of concrete using a high performance AE water reducing agent. Specifically, a high-performance AE water reducing agent is blended to produce a base concrete, and the base concrete is transported to a casting site, and then further mixed with the high-performance AE water reducing agent. Provided is a method for early strength development of concrete using a performance AE water reducing agent. More specifically, in a ready-mixed plant, a high-performance AE water-reducing agent is blended into a slump 5 cm.
A base concrete of at least 8 cm, preferably at least 8 cm, more preferably 8 to 15 cm is manufactured, and the base concrete is transported to a casting site by an agitator car. A high-performance AE comprising a fluidized concrete of 8 cm or more, preferably 10 cm or more, and more preferably 15 to 21 cm, and casting the fluidized concrete.
Provide a method for early strength development of concrete using a water reducing agent.
【０００８】前記の方法に使用する高性能ＡＥ減水剤と
しては，ポリカルボン酸系化合物を主成分とするものが
好ましく，具体的には，スチレン−無水マレイン酸共重
合体及びその部分エステル化合物，アリルエーテル−無
水マレイン酸共重合体及びその誘導体，（分岐）ペンテ
ニルエーテル−無水マレイン酸共重合体及びその誘導
体，（メタ）アクリル酸−（メタ）アクリル酸エステル
及びその誘導体を例示することができる。さらに具体的
には本発明の高性能ＡＥ減水剤は，コンクリート工学 V
ol.37, No.6, 1999.6 のP.91-92 に記載されたポリカル
ボン酸系の市販の高性能ＡＥ減水剤（例えば，エヌエム
ビー社のレオビルドＳＰシリーズ，エフ・ピー・ケー社
のパリックＦＰシリーズ，花王社のマイティシリーズ，
竹本油脂社のチューポールＨＰシリーズ，グレースケミ
カルズ社のダーレックススーパー１００Ｐシリーズ，日
本シーカ社のシーカメントシリーズ，サンフロー社のサ
ンフローＨＳシリーズ，レンゴー社のリグエースＮＲ−
７００）を例示することができる。As the high-performance AE water reducing agent used in the above-mentioned method, those having a polycarboxylic acid compound as a main component are preferred. Specifically, a styrene-maleic anhydride copolymer and its partial ester compound, Allyl ether-maleic anhydride copolymer and its derivative, (branched) pentenyl ether-maleic anhydride copolymer and its derivative, (meth) acrylic acid- (meth) acrylate and its derivative can be exemplified. . More specifically, the high-performance AE water reducing agent of the present invention is used in concrete engineering V
ol. 37, No. 6, 1999.6, pp. 91-92, a commercially available high performance AE water reducing agent of the polycarboxylic acid type (for example, Reobuild SP series of NMB, PALIC FP of FPK). Series, Kao's mighty series,
Takemoto Yushi's Tupole HP Series, Grace Chemicals' Darrex Super 100P Series, Nippon Sika's Sicarement Series, Sunflow's Sunflow HS Series, Rengo's Rig Ace NR-
700).
【０００９】[0009]
【発明の実施の形態】本発明は，高性能ＡＥ減水剤の本
来の使用目的とは異なり，その使用の仕方を工夫して，
所要の施工性を得るとともに，コンクリートの初期強度
を発現させるようにしたものである。以下にスリップフ
ォーム工法でサイロ筒体を施工する場合を例として，本
発明者らが行なった試験例を参照しながら本発明の実施
の形態を説明する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention is different from the original purpose of use of a high-performance AE water reducing agent.
The required workability is obtained and the initial strength of concrete is developed. Hereinafter, an embodiment of the present invention will be described with reference to test examples performed by the present inventors, taking as an example a case where a silo cylinder is constructed by a slip foam method.
【００１０】スリップフォーム工法では前述のように，
コンクリートに求められる性能としては，施工性，構造
体強度，耐久性などに加えて，スリップにより脱型した
時にコンクリートが自立できるだけの強度，すなわち若
材齢強度が求められる。In the slip form method, as described above,
As the performance required for concrete, in addition to workability, structural strength, durability, and the like, the strength required for the concrete to become self-supporting when removed from the mold by slipping, that is, the strength of young age is required.
【００１１】いま，セメント３２４Ｋｇ／ｍ3，フライ
アッシュ３６Ｋｇ／ｍ3で合計粉体量３６０Ｋｇ／ｍ3と
し，目標スランプ１８±２.５ｃｍ，目標空気量４±１.
５％の流動化コンクリートをスリップフォーム工法で施
工するものとし，若材齢強度が４時間で０.０５Ｎ／ｍ
ｍ2が必要であるとする（設計基準強度は３５Ｎ／ｍ
ｍ 2）。Now, 324 Kg / m of cementThree,fly
Ash 36Kg / mThreeWith total powder amount of 360Kg / mThreeWhen
Target slump 18 ± 2.5 cm, target air flow 4 ± 1.
5% fluidized concrete is applied by slip form method.
The young age strength is 0.05 N / m in 4 hours.
mTwo(Design standard strength is 35 N / m
m Two).
【００１２】この条件において，表１に示す基本調合
（以下，調合Ｈと言う）では，２０℃の雰囲気において
前記の若材齢強度「４時間で０.０５Ｎ／ｍｍ2以上」は
達成できない。この基本調合（調合Ｈ）は，生コンプラ
ントでＡＥ減水剤を添加して目標スランプ１２±２.５
ｃｍのベースコンクリートを製造し，これをアジテータ
者で打設現場に搬送し，アジテータ車内のベースコンク
リートに対して流動化剤を配合して目標スランプ１８±
２.５ｃｍの流動化コンクリートを得ることを想定した
ものである。そこで，表２の材料を使用し，表３に示す
ような各種のコンクリート（調合Ｈａ，ＨｂおよびＨ
ｃ）を製造し，その若材齢強度を調べた。Under these conditions, with the basic formulation shown in Table 1 (hereinafter referred to as formulation H), the above-mentioned young age strength of “0.05 N / mm 2 or more in 4 hours” cannot be achieved in an atmosphere at 20 ° C. This basic formulation (Formulation H) is achieved by adding an AE water reducing agent in a ready-mixed plant and producing a target slump of 12 ± 2.5.
cm of base concrete is manufactured and transported to a casting site by an agitator, and a fluidizing agent is mixed with the base concrete in the agitator vehicle to achieve a target slump of 18 ±.
It is assumed that 2.5 cm of fluidized concrete is obtained. Therefore, using the materials shown in Table 2, various types of concrete (formulations Ha, Hb and H) as shown in Table 3 were used.
c) was manufactured and its young age strength was examined.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【表２】 [Table 2]
【００１５】[0015]
【表３】 [Table 3]
【００１６】表３において，混和剤の一次添加は，前記
のように生コンプラントでのベースコンクリート製造時
での添加を想定したもの，二次添加は現場でのアジテー
タ車で添加して流動化コンクリートとすることを想定し
たものであるが，試験での練り混ぜは，強制２軸型ミキ
サ（容量１００Ｌ）を使用し，細骨材，セメント，粗骨
材を投入して３０秒空練り後，混練水と一次添加用混和
剤を投入して９０秒練り混ぜた。その後，混和剤を二次
添加したものは，さらに０〜３０分後に，二次添加用混
和剤を添加し６０秒練り混ぜた。In Table 3, the primary addition of the admixture assumes the addition at the time of the base concrete production in the ready-mixed plant as described above, and the secondary addition is performed by adding the fluidized concrete by the on-site agitator wheel. The kneading in the test was carried out using a forced biaxial mixer (capacity: 100 L), and fine aggregate, cement, and coarse aggregate were charged and kneaded for 30 seconds. The kneading water and the primary addition admixture were charged and kneaded for 90 seconds. After that, the mixture to which the admixture was added secondarily was added 0 to 30 minutes later, and the admixture for secondary addition was added and kneaded for 60 seconds.
【００１７】調合Ｈでは，前記のようにベースコンクリ
ートでの目標スランプが１２ｃｍ，流動化コンクリート
での目標スランプが１８ｃｍとなるようにＡＥ減水剤
（商品名：ポゾリス７８Ｓ）および流動化剤（商品名：
レオビルドＮＰ２０）の添加量を調整した。調合Ｈａ
は，調合Ｈでの流動化剤の添加時に耐寒促進剤を併用し
たものであり，耐寒促進剤の添加量は結合材１００Ｋｇ
に対し１０００ｍＬ（混練水内割）とした。In Formulation H, as described above, the AE water reducing agent (trade name: Pozzolith 78S) and the fluidizing agent (trade name) were set so that the target slump in the base concrete was 12 cm and the target slump in the fluidized concrete was 18 cm. :
The amount of Rheobuild NP20) was adjusted. Formulation Ha
Is a mixture of a cold-resistance promoter and a cold-resistance promoter at the time of adding a fluidizing agent in Formulation H.
To 1000 mL (kneading water ratio).
【００１８】調合Ｈｂと調合Ｈｃは, 高性能ＡＥ減水剤
（商品名：レオビルドＳＰ８Ｎ）を一括添加したものと
分割添加したものであるが，その添加量と練り上がり時
の性状を表４に調合Ｈと対比して示した。Formulation Hb and Formulation Hc were obtained by adding a high-performance AE water reducing agent (trade name: Reobuild SP8N) in a lump and by adding it separately. Table 4 shows the amounts added and the properties at the time of kneading. It is shown in comparison with H.
【００１９】[0019]
【表４】 [Table 4]
【００２０】表４の結果に見られるように，調合Ｈｃの
分割添加では高性能ＡＥ減水剤の合計使用量はＣ×1.3
％であり，この合計使用量は，調合Ｈｂの一括添加の使
用量Ｃ×1.7 ％よりも少ないけれども十分なスランプ値
が得られている。As can be seen from the results in Table 4, the total amount of the high-performance AE water reducing agent was C × 1.3 in the divided addition of the prepared Hc.
%, And the total amount used is smaller than the amount C × 1.7% of the batch addition of the prepared Hb, but a sufficient slump value is obtained.
【００２１】得られた各調合のコンクリートからφ１０
×２０ｃｍの供試体をＪＩＳＡ １１３８によって成形
し，雰囲気温度２０℃で試験材齢まで養生し，ＪＩＳＡ
１２１６に従って若材齢時の圧縮強度を測定した。そ
の結果を表５および図１に示した。From the obtained concrete of each mix, φ10
A × 20 cm specimen was molded according to JISA 1138, cured at the ambient temperature of 20 ° C to the age of the test material,
According to 1216, the compressive strength at the young age was measured. The results are shown in Table 5 and FIG.
【００２２】[0022]
【表５】 [Table 5]
【００２３】表５および図１の結果に見られるように，
ＡＥ減水剤と流動化剤を用いた標準調合Ｈに対し，耐寒
促進剤を使用した調合Ｈａや高性能ＡＥ減水剤を使用し
た調合ＨｂやＨｃでは，若材齢強度が増加している。調
合ＨｂやＨｃで若材齢強度が増強しているのは高性能Ａ
Ｅ減水剤の働きによる。すなわち通常のＡＥ減水剤や流
動化剤に比べて高性能ＡＥ減水剤ではセメント粒子の分
散性が一層高まったので，セメントの水和反応効率が向
上し，このことが強度発現に寄与したと考えてよい。As can be seen from Table 5 and the results in FIG.
In contrast to the standard formulation H using the AE water reducing agent and the fluidizing agent, the formulation Ha using the cold resistance promoter and the formulations Hb and Hc using the high performance AE water reducing agent have increased young age strength. It is the high-performance A that the strength of the young age is increased by the mixture Hb and Hc
E Depends on water reducing agent. In other words, the dispersibility of cement particles was further improved with the high-performance AE water-reducing agent compared to ordinary AE water-reducing agents and superplasticizers, so that the hydration reaction efficiency of the cement was improved and this contributed to the strength development. May be.
【００２４】しかし，高性能ＡＥ減水剤を一括添加する
調合Ｈｂにおいては，材齢４時間強度が０.０３Ｎ／ｍ
ｍ2であり，また材齢５〜６時間でもそれほど向上して
いないのに対し，高性能ＡＥ減水剤を分割添加した調合
Ｈｃのものは材齢４時間での圧縮強度０.０８Ｎ／ｍｍ2
（調合Ｈの４倍）が得られ，目標の０.０５Ｎ／ｍｍ2以
上が達成されている。このように，高性能ＡＥ減水剤一
括添加に比べて分割添加では若材齢強度が倍増している
点が特徴的であるが，これは，同じ施工性を得る時，一
括添加するより分割添加した方が高性能ＡＥ減水剤の使
用量が少なくなる為（表４参照），水和反応に対する遅
延効果が小さくなり，このことが強度発現性に寄与する
と考えてよい。However, in the preparation Hb to which the high-performance AE water reducing agent was added all at once, the strength for 4 hours of age was 0.03 N / m.
m 2, and also while not significantly improved even age of 5-6 hours, the compressive strength at the age 4 hours ones formulated Hc with a high performance AE water reducing agent was added portionwise 0.08 N / mm 2
(Four times the formulation H) was achieved, and the target of 0.05 N / mm 2 or more was achieved. As described above, it is characteristic that the strength of the young age is doubled by the split addition compared with the batch addition of the high-performance AE water reducing agent. Since the amount of the high-performance AE water reducing agent used decreases (see Table 4), the delay effect on the hydration reaction decreases, which may be considered to contribute to the strength development.
【００２５】したがって，調合Ｈｃのコンクリートはス
リップフォーム工法に十分に対応できるものであり，実
際の施工においては，生コンプラントにおいて高性能Ａ
Ｅ減水剤を配合して目標スランプ１０〜１５ｃｍ（例え
ば１２ｃｍ）のベースコンクリートを製造し，このベー
スコンクリートをアジテータ車で打設現場に搬送し，次
いでアジテータ車内のベースコンクリートに高性能ＡＥ
減水剤を添加して目標スランプ１５〜２１ｃｍ（例えば
１８ｃｍ）の流動化コンクリートとし，この流動化コン
クリートを打設すれば，材齢４時間での強度０.０５Ｎ
／ｍｍ2以上を十分に満たすことができる。Therefore, the concrete of the blended Hc can sufficiently cope with the slip-form method, and in actual construction, a high-performance A
A base concrete having a target slump of 10 to 15 cm (e.g., 12 cm) is manufactured by mixing the water reducing agent, and the base concrete is transported to a casting site by an agitator car.
By adding a water reducing agent to a fluidized concrete having a target slump of 15 to 21 cm (for example, 18 cm), if the fluidized concrete is cast, the strength at a material age of 4 hours of 0.05 N
/ Mm 2 or more.
【００２６】もちろんスリップフォーム工法に限らず，
早期強度が必要な施工の場合にも本発明を適用でき，高
性能ＡＥ減水剤の分割添加の配分比や合計添加量，分割
添加時期等をその施工に応じて調整することにより，そ
の施工に適した早期強度と流動性を具備したコンクリー
トを得ることができる。Of course, not limited to the slip form method,
The present invention can also be applied to construction requiring early strength, and by adjusting the distribution ratio of total addition of the high-performance AE water reducing agent, the total addition amount, the timing of the division addition, etc. according to the construction, the construction can be performed. Concrete having suitable early strength and fluidity can be obtained.
【００２７】[0027]
【発明の効果】以上説明したように，本発明によれば，
高性能ＡＥ減水剤の使用によって打設後数時間で強度が
高くなるコンクリートが得られる。このため硬化促進剤
の使用によるスランプ保持時間の低下といった問題や，
加熱養生などの施工上の問題もなく，簡単にコンクリー
トの早期強度を発現させることができるようになった。
とくに本発明法では高性能ＡＥ減水剤を用いる関係上，
スリップフォーム工法を実施する場合にこれまでのもの
にはない効果を発揮する。As described above, according to the present invention,
The use of a high-performance AE water reducing agent results in concrete having increased strength within a few hours after casting. As a result, problems such as a decrease in slump holding time due to the use of a curing accelerator,
It is now possible to easily develop the early strength of concrete without any problems in construction such as heat curing.
In particular, in the method of the present invention, since a high-performance AE water reducing agent is used,
When the slip form method is implemented, it has an effect that has not been achieved so far.
【図１】本発明法に従うコンクリートの若材齢強度を比
較例のものと対比して示した図である。FIG. 1 is a diagram showing the young age strength of concrete according to the method of the present invention in comparison with that of a comparative example.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 依田 和久 東京都調布市飛田給二丁目19番１号 鹿島 建設株式会社技術研究所内 (72)発明者 鍋島 健彦 東京都港区元赤坂一丁目２番７号 鹿島建 設株式会社内 (72)発明者 名倉 健二 東京都港区芝浦１−２−３ 清水建設株式 会社内 (72)発明者 杉橋 直行 東京都港区芝浦１−２−３ 清水建設株式 会社内 (72)発明者 梅沢 健一 神奈川県茅ヶ崎市萩園2722 株式会社エヌ エムビー内 (72)発明者 岩永 豊司 神奈川県茅ヶ崎市萩園2722 株式会社エヌ エムビー内 Ｆターム(参考） 2E172 AA09 AA17 4G056 AA08 AA21 CB32 CC24 CD64 DA05 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhisa Yoda 2-9-1-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Inventor Takehiko Nabeshima 1-2-7 Moto-Akasaka, Minato-ku, Tokyo No. Kashima Construction Co., Ltd. (72) Inventor Kenji Nakura 1-2-3 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Naoyuki Sugibashi 1-2-3, Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Kenichi Umezawa 2722 Hagizono, Chigasaki-shi, Kanagawa Prefecture N.B. CD64 DA05
Claims (5)
リートを練り混ぜ，得られたコンクリートに高性能ＡＥ
減水剤を二次添加して混合することからなる，早期強度
発現性を有するコンクリートの製造方法。1. A high-performance AE water reducing agent is first added and a concrete is kneaded, and the obtained concrete is mixed with a high-performance AE water reducing agent.
A method for producing concrete having early strength development, comprising secondary addition of a water reducing agent and mixing.
クリートを製造し，このベースコンクリートをアジテー
タ車に積み込み，さらに高性能ＡＥ減水剤を該コンクリ
ートに添加することからなる，早期強度発現性を有する
コンクリートの製造方法。2. A high-performance AE water reducing agent is blended to produce a base concrete, the base concrete is loaded on an agitator wheel, and a high-performance AE water reducing agent is added to the concrete. Method for producing concrete.
剤を配合してスランプ５ｃｍ以上のベースコンクリート
を製造し，このベースコンクリートをアジテータ車に積
み込み，次いでアジテータ車内のベースコンクリートに
高性能ＡＥ減水剤を添加することからなる，所要の施工
性と早期強度発現性を有するコンクリートの製造方法。3. A high-performance AE water reducing agent is mixed in a ready-mixed plant to produce a base concrete with a slump of 5 cm or more. A method for producing concrete with required workability and early strength development.
に適用するコンクリートである請求項１ないし３に記載
の早期強度発現性を有するコンクリートの製造方法。4. The method for producing concrete having early strength development according to claim 1, wherein the concrete is concrete applied to a slipform method.
合物である請求項１ないし４に記載の早期強度発現性を
有するコンクリートの製造方法。5. The method for producing concrete having early strength development according to claim 1, wherein the high-performance AE water reducing agent is a polycarboxylic acid compound.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24613899A JP4377005B2 (en) | 1999-08-31 | 1999-08-31 | Slip foam construction method using concrete with early strength development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24613899A JP4377005B2 (en) | 1999-08-31 | 1999-08-31 | Slip foam construction method using concrete with early strength development |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001062823A true JP2001062823A (en) | 2001-03-13 |
| JP4377005B2 JP4377005B2 (en) | 2009-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24613899A Expired - Fee Related JP4377005B2 (en) | 1999-08-31 | 1999-08-31 | Slip foam construction method using concrete with early strength development |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009001446A (en) * | 2007-06-21 | 2009-01-08 | Chubu Electric Power Co Inc | Gap-filling filler and method of manufacturing the same |
| JP2011148645A (en) * | 2010-01-19 | 2011-08-04 | Ohbayashi Corp | Cement composition and slip form construction method |
| JP2018192640A (en) * | 2017-05-12 | 2018-12-06 | 新技術建材株式会社 | Method for blending concrete |
| CN110426508A (en) * | 2019-08-21 | 2019-11-08 | 珠海春禾新材料研究院有限公司 | A kind of slump adjustment device and its method of adjustment of ready-mixed concrete mixture |
-
1999
- 1999-08-31 JP JP24613899A patent/JP4377005B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009001446A (en) * | 2007-06-21 | 2009-01-08 | Chubu Electric Power Co Inc | Gap-filling filler and method of manufacturing the same |
| JP2011148645A (en) * | 2010-01-19 | 2011-08-04 | Ohbayashi Corp | Cement composition and slip form construction method |
| JP2018192640A (en) * | 2017-05-12 | 2018-12-06 | 新技術建材株式会社 | Method for blending concrete |
| CN110426508A (en) * | 2019-08-21 | 2019-11-08 | 珠海春禾新材料研究院有限公司 | A kind of slump adjustment device and its method of adjustment of ready-mixed concrete mixture |
| CN110426508B (en) * | 2019-08-21 | 2024-02-20 | 珠海春禾新材料研究院有限公司 | Slump adjusting device and slump adjusting method for ready-mixed concrete mixture |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4377005B2 (en) | 2009-12-02 |
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