JP3478571B2 - Concrete air volume adjustment method - Google Patents
Concrete air volume adjustment methodInfo
- Publication number
- JP3478571B2 JP3478571B2 JP26101193A JP26101193A JP3478571B2 JP 3478571 B2 JP3478571 B2 JP 3478571B2 JP 26101193 A JP26101193 A JP 26101193A JP 26101193 A JP26101193 A JP 26101193A JP 3478571 B2 JP3478571 B2 JP 3478571B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- air
- bubbles
- amount
- fine
- 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 - Fee Related
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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/106—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam by adding preformed foams
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (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)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、現場打ちされるコンク
リート中に微細気泡を連行することによってコンクリー
トに必要な空気量を確保できるようにしたコンクリート
の空気量調整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 adjusting the amount of air in concrete, in which fine air bubbles are entrained in the concrete to be cast in situ so that the amount of air required for the concrete can be secured.
【０００２】[0002]
【従来の技術】コンクリート中に微細気泡を連行させる
方法としては、ＡＥ剤を添加することが一般に行われて
いる。ＡＥ剤は界面活性剤の１種であり、このＡＥ剤を
コンクリート内に添加混合することによってコンクリー
ト内に無数の微細な独立気泡を連行させるものである。
コンクリート中に連行された微細気泡はコンクリートの
硬化後に微細な気泡孔を構成し、例えば寒冷時等におけ
る自由水の凍結膨脹時に気泡孔が潰れることにより、応
力解放を行ってコンクリートの凍害を防止するほか、フ
レッシュコンクリートのワーカビリチーを向上させるの
にも役立っている。2. Description of the Related Art As a method of entraining fine air bubbles in concrete, it is common practice to add an AE agent. The AE agent is one kind of a surfactant, and by adding and mixing this AE agent into concrete, numerous infinite fine closed cells are carried in the concrete.
The fine air bubbles entrained in the concrete form fine air voids after the concrete hardens.For example, when the air bubbles are crushed during freezing and expansion of free water in cold weather etc., stress is released and frost damage of concrete is prevented. It also helps improve the workability of fresh concrete.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、この微
細気泡の含有量が多すぎた場合にはコンクリートの強度
が低下し、少なすぎると前述する効果が得られないた
め、その添加量の管理が重要となる。また、この種の微
細気泡は、混練後に経時的に減少するため、特に生コン
車によって遠方から運搬されてくるコンクリートにあっ
ては、混練時において当初設定されたＡＥ剤の配合比で
は打設時の気泡含有量が低下してしまう場合がある。However, when the content of the fine bubbles is too large, the strength of the concrete decreases, and when it is too small, the above-mentioned effects cannot be obtained, so it is important to control the addition amount. Becomes In addition, since this kind of fine air bubbles decrease with time after kneading, especially for concrete that is transported from a distance by a ready-mixed concrete truck, the mixing ratio of the AE agent initially set at the time of kneading can be used when pouring. There is a case where the bubble content of is reduced.
【０００４】例えばＪＩＳＡ５３０８によって定める気
泡含有量の管理幅は±１．５％であり、当該コンクリー
トに必要な気泡量を含有空気量に換算して体積比で４．
５％と設定した場合には打設時には３〜６％の範囲にお
さめる必要がある。For example, the control range of the bubble content defined by JIS A5308 is ± 1.5%, and the volume ratio of the bubble content required for the concrete is 4.
If it is set to 5%, it is necessary to keep it in the range of 3 to 6% at the time of driving.
【０００５】従って、混練時にはコンクリート打設まで
の間の気泡量の低下を予め見込んで多めに添加しておけ
ばよいものの、その見込み幅にばら付きがあり、品質が
不安定となる原因になる。Therefore, at the time of kneading, a large amount of air bubbles may be added in anticipation of a decrease in the amount of air bubbles until the concrete is poured, but there is a variation in the expected width, which causes unstable quality. .
【０００６】本発明は以上の問題を解決するものであ
り、その目的はコンクリートの打設直前に微細気泡をコ
ンクリート中に連行させることにより、微細気泡量の管
理を厳密に行うことができるようにしたコンクリートの
空気量調整方法を提供するものである。The present invention is intended to solve the above problems, and an object of the present invention is to rigorously control the amount of fine bubbles by entraining fine bubbles into the concrete immediately before placing concrete. The present invention provides a method for adjusting the amount of air in concrete.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するため
にこの発明方法では、ワーカビリチーを向上し又は凍害
を防止するため、コンクリート内に微細気泡を連行する
コンクリートの空気量調整方法であって、起泡剤溶液と
圧縮空気とを気液混合した未発泡状態の気液混合物を急
速減圧することのみにより予めシェービングクリーム状
に発泡させた微細気泡を打設直前のコンクリート中に添
加混練することを特徴とする。この発明においては、前
記微細気泡をコンクリートの打設現場にて添加混練する
ことが好ましい。[Means for Solving the Problems] In order to achieve the above object, the method of the present invention improves workability or freeze damage.
To prevent this, entrain fine air bubbles in the concrete.
A method for adjusting the amount of air in concrete, comprising using a foaming agent solution
A gas-liquid mixture of compressed air and liquid that has not been foamed is rapidly mixed.
It is characterized in that fine air bubbles previously foamed into a shaving cream form are added and kneaded into concrete just before pouring only by rapidly depressurizing . In the present invention, it is preferable to add and knead the fine bubbles at a concrete pouring site.
【０００８】[0008]
【作用】以上の方法によれば、コンクリート量に対する
微細気泡の供給量に応じた所定量の微細気泡をコンクリ
ート中に連行することができ、また、その状態で直ちに
コンクリートを打設するため、気泡の減少量が少ない。According to the above method, a predetermined amount of fine bubbles corresponding to the supply amount of fine bubbles to the concrete amount can be entrained in the concrete, and since the concrete is immediately placed in that state, the bubbles The decrease amount of is small.
【０００９】[0009]
【実施例】以下本発明方法の実施例を図面を用いて詳細
に説明する。図１は本発明方法を実施するため現場に設
置されるコンクリート製造プラントの概要を示すもので
ある。同図において、コンクリートミキサー車１からは
コンクリートミキサー２内に１バッチ分のコンクリート
Ｃが供給される。Embodiments of the method of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an outline of a concrete manufacturing plant installed on site to carry out the method of the present invention. In the figure, one batch of concrete C is supplied from the concrete mixer truck 1 into the concrete mixer 2.
【００１０】一方、ミキサー２には、別系統の気泡発生
装置３を通じて気泡が供給される。気泡発生装置３は、
起泡剤溶液が収容された貯槽４と、貯槽４にポンプ５を
介して接続された混合器６と、混合器６の先端に接続さ
れ吐出口を前記ミキサー２内に向けた発泡ノズル７と、
前記混合器８内に圧縮空気を供給するエアコンプレッサ
９とからなっている。On the other hand, bubbles are supplied to the mixer 2 through a bubble generator 3 of another system. The bubble generator 3 is
A storage tank 4 containing a foaming agent solution, a mixer 6 connected to the storage tank 4 via a pump 5, and a foaming nozzle 7 connected to the tip of the mixer 6 and having a discharge port directed into the mixer 2. ,
It comprises an air compressor 9 for supplying compressed air into the mixer 8.
【００１１】前記貯槽４内に収容される起泡剤溶液は、
界面活性剤あるいは起泡剤の水溶液であって、界面活性
剤としては、高級アルキルエーテル硫酸エステル、アル
キルベンゼンスルホン酸ナトリウム、α−オレインスル
ホン酸等のアニオン系界面活性剤、両性界面活性剤，ノ
ニオン系界面活性剤が掲げられる。なお、カチオン系界
面活性剤は、作業性やセメントとの接着を低下させるだ
けでなく、鉄筋の発錆も考えられるため、本発明の実施
例として除外することが好ましい。起泡剤としては、樹
脂石鹸系起泡剤、タンパク系起泡剤等があり、これら界
面活性剤及び起泡剤はその性状、特徴等に応じて単独あ
るいは適宣の配合比で混合して用いられる。The foaming agent solution contained in the storage tank 4 is
An aqueous solution of a surfactant or a foaming agent, and examples of the surfactant include anionic surfactants such as higher alkyl ether sulfate, sodium alkylbenzene sulfonate, and α-olein sulfonic acid, amphoteric surfactants, nonionic surfactants. Surfactants are listed. It is preferable to exclude the cationic surfactant as an example of the present invention because it not only lowers workability and adhesion to cement, but also may cause rusting of reinforcing bars. Foaming agents include resin soap-based foaming agents, protein-based foaming agents, etc., and these surfactants and foaming agents may be used alone or in a suitable mixing ratio depending on their properties and characteristics. Used.
【００１２】ポンプ５を通じて混合器６内に圧送された
起泡剤溶液はエアコンプレッサ９により送られた圧縮空
気と気液混合する。この段階では未発泡状態であり、こ
の気液混合物は発泡ノズル７内に圧送され、この内部で
急速に減圧されることによってのみシェービングクリー
ム状の微細気泡Ａとなって急速発泡しつつノズル７の先
端から吐出され、ミキサー２内に供給される。このと
き、ミキサー２内にある１バッチ分のコンクリートＣの
量に対して適宜の体積比となるように前記気泡Ａの投入
量あるいは投入時間が管理される。次いでミキサー２の
混合動作により、微細気泡Ａは均一な分布となるようコ
ンクリートＣ内に連行される。The foaming agent solution pressure-fed into the mixer 6 through the pump 5 mixes with the compressed air fed by the air compressor 9 in a gas-liquid mixture. This is a stage is unfoamed state, the gas-liquid mixture is pumped into the foaming nozzle 7, rapidly expanded while the nozzles 7 becomes shaving cream fine-bubble A only by being rapidly reduced in pressure by the internal It is discharged from the tip and supplied into the mixer 2. At this time, the charging amount or the charging time of the bubbles A is controlled so that the volume ratio becomes appropriate with respect to the amount of the concrete C for one batch in the mixer 2. Then, by the mixing operation of the mixer 2, the fine bubbles A are carried in the concrete C so as to have a uniform distribution.
【００１３】混練後の微細気泡を含むコンクリートＣは
直ちにコンクリートポンプ１０を通じて打設現場１１に
打設される。従って、コンクリートＣ内に連行された微
細気泡Ａは経時的な減少を生ずることなく、当初の配合
比を保持したまま打設されることになり、安定した品質
の含気泡コンクリートが生成される。The concrete C containing fine air bubbles after kneading is immediately poured into the casting site 11 through the concrete pump 10. Therefore, the fine bubbles A entrained in the concrete C do not decrease with time, and are cast while maintaining the initial mixing ratio, so that a stable quality bubble-containing concrete is produced.
【００１４】なお、上記実施例では、コンクリートミキ
サー車１からミキサー２内にコンクリートを供給する構
成としたが、ミキサー２内に骨材、セメント及び水を投
入してコンクリートを生成した後、該ミキサー２内にシ
ェービングクリーム状の微細気泡Ａを供給して混合する
こともできる。In the above embodiment, concrete is supplied from the concrete mixer truck 1 into the mixer 2. However, after the aggregate, cement and water are put into the mixer 2 to generate concrete, the concrete is mixed. It is also possible to supply and mix shaving cream-like fine bubbles A into the inside of 2.
【００１５】また、上記実施例では、ミキサー２を用い
ることによりバッチ式で含気泡コンクリートを生成した
が、例えば中空筒状の水平パイプ内に回転可能な螺旋状
の撹拌翼を配置し、このパイプの端部からコンクリート
を供給するとともに、該パイプの端部或いは中間部から
前記微細気泡を供給することにより連続式で含気泡コン
クリートを生成してもよい。In the above embodiment, the aerated concrete was produced in batch by using the mixer 2. For example, a rotatable spiral stirring blade is arranged in a hollow cylindrical horizontal pipe, and this pipe is used. The concrete containing bubbles may be supplied from the end portion of the pipe and the fine bubbles may be supplied from the end portion or the intermediate portion of the pipe to produce the bubble-containing concrete in a continuous manner.
【００１６】[0016]
【発明の効果】以上実施例で説明したように本発明に係
るコンクリートの空気量調整方法にあっては、コンクリ
ート量に対する微細気泡の供給量に応じた所定量の微細
気泡をコンクリート中に連行することができ、また、そ
の状態で直ちにコンクリートを打設するため、気泡量の
減少がなく、微細気泡量の管理を厳密に行うことができ
微細気泡入りコンクリートの品質を安定にすることがで
きる。As described in the above embodiments, in the concrete air amount adjusting method according to the present invention, a predetermined amount of fine bubbles corresponding to the amount of supply of fine bubbles to the amount of concrete is entrained in the concrete. In addition, since the concrete is immediately placed in that state, the amount of bubbles does not decrease, the amount of fine bubbles can be strictly controlled, and the quality of the fine bubble-containing concrete can be stabilized.
【図１】本発明方法を実施するためのプラントの説明図
である。FIG. 1 is an explanatory diagram of a plant for carrying out the method of the present invention.
２ コンクリートミキサー ３ 気泡発生装置 Ｃ コンクリート Ａ 微細気泡 2 concrete mixer 3 Bubble generator C concrete A micro bubbles
───────────────────────────────────────────────────── フロントページの続き (72)発明者 三浦 律彦 東京都千代田区神田司町２丁目３番地 株式会社大林組東京本社内 (72)発明者 竹田 宣典 東京都千代田区神田司町２丁目３番地 株式会社大林組東京本社内 (72)発明者 平田 隆祥 東京都千代田区神田司町２丁目３番地 株式会社大林組東京本社内 (72)発明者 栗原 正美 東京都千代田区神田司町２丁目３番地 株式会社大林組東京本社内 (56)参考文献 特開 平２−35169（ＪＰ，Ａ) 特開 平２−308068（ＪＰ，Ａ) 特開 平４−47069（ＪＰ，Ａ) 特開 昭57−129857（ＪＰ，Ａ) 特開 昭59−88361（ＪＰ，Ａ) 実開 昭57−165411（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Norihiko Miura 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Noritake Takeda 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Takayoshi Hirata 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Masami Kurihara 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (56) Reference JP-A-2-35169 (JP, A) Japanese Unexamined Patent Publication No. 2-308068 (JP, A) JP-A-4-47069 (JP, A) JP-A-57-129857 (JP, A) JP-A-59-88361 (JP, A) 57-165411 (JP, U)
Claims (2)
するため、コンクリート内に微細気泡を連行するコンク
リートの空気量調整方法であって、起泡剤溶液と圧縮空
気とを気液混合した未発泡状態の気液混合物を急速減圧
することのみにより予めシェービングクリーム状に発泡
させた微細気泡を打設直前のコンクリート中に添加混練
することを特徴とするコンクリートの空気量調整方法。1. Improve workability or prevent frost damage
In order to ensure that
A method for adjusting the air volume of a reet, which comprises a foaming agent solution and compressed air.
Rapid decompression of an unfoamed gas-liquid mixture of gas and liquid
A method for adjusting the amount of air in concrete, characterized in that fine air bubbles that have been foamed in the form of a shaving cream are added and kneaded into the concrete just before being cast.
にて添加混練することを特徴とする請求項１に記載のコ
ンクリートの空気量調整方法。2. The method for adjusting the amount of air for concrete according to claim 1, wherein the fine bubbles are added and kneaded at a concrete pouring site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26101193A JP3478571B2 (en) | 1993-10-19 | 1993-10-19 | Concrete air volume adjustment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26101193A JP3478571B2 (en) | 1993-10-19 | 1993-10-19 | Concrete air volume adjustment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07118082A JPH07118082A (en) | 1995-05-09 |
| JP3478571B2 true JP3478571B2 (en) | 2003-12-15 |
Family
ID=17355823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26101193A Expired - Fee Related JP3478571B2 (en) | 1993-10-19 | 1993-10-19 | Concrete air volume adjustment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3478571B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4773700B2 (en) * | 2004-09-08 | 2011-09-14 | 株式会社ミルコン | Raw concrete production equipment |
| JP2015044730A (en) * | 2013-07-29 | 2015-03-12 | 公立大学法人高知工科大学 | Self-compactable concrete that suppresses decrease in flowability caused by coarse aggregate, and method of producing the same |
-
1993
- 1993-10-19 JP JP26101193A patent/JP3478571B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07118082A (en) | 1995-05-09 |
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