JPS61162303A - Method of kneading concrete - Google Patents
Method of kneading concreteInfo
- Publication number
- JPS61162303A JPS61162303A JP221285A JP221285A JPS61162303A JP S61162303 A JPS61162303 A JP S61162303A JP 221285 A JP221285 A JP 221285A JP 221285 A JP221285 A JP 221285A JP S61162303 A JPS61162303 A JP S61162303A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- water
- kneading
- aggregate
- cement
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 7
- 238000004898 kneading Methods 0.000 title description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000004568 cement Substances 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 239000012615 aggregate Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はコンクリートの混練方法に係るものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for mixing concrete.
（従来の技術）
天然骨材を使用する普通コンクリートは、セメント、砂
、砕石等の骨材、水及び混和剤をｅｌぼ同時にミキサに
投入して混練することによって製造されている。(Prior Art) Ordinary concrete using natural aggregates is manufactured by charging aggregates such as cement, sand, crushed stone, water, and admixtures into a mixer at the same time and kneading them.
軽量骨材を使用する軽量コンクリートは、事前に軽量骨
材に吸水（プレウエッティング）させた後、普通コンク
リートと同様の方法で混練して製造されている。Lightweight concrete using lightweight aggregate is manufactured by allowing the lightweight aggregate to absorb water (prewetting) in advance and then kneading it in the same manner as ordinary concrete.
なお軽量骨材のプレウエツテイングは、混練中に骨材の
吸水によるコンクリートのワーカビリティの低下の防止
、及び強度コントロールのために行なわれるものである
。Prewetting of lightweight aggregates is carried out to prevent deterioration of workability of concrete due to water absorption by aggregates during mixing and to control strength.
（発明が解決しようとする問題点）
前記従来の方法で製造された軽量コンクリートは、普通
コンクリートに比して次のような欠点を有する。(Problems to be Solved by the Invention) Lightweight concrete produced by the conventional method has the following disadvantages compared to ordinary concrete.
即ちプレウエツテイングによって骨材中にコンクリート
の強度やワーカビリティに関係のない水分が吸収され、
硬化後のコンクリートの耐久性、特に凍結融解に対する
抵抗性が著しく劣化する。In other words, pre-wetting absorbs moisture into the aggregate that has no bearing on the strength or workability of the concrete.
The durability of concrete after hardening, especially its resistance to freezing and thawing, deteriorates significantly.
また軽量コンクリートをポンプ圧送する場合、圧力によ
ってコンクリート中の水分が軽量骨材中に浸透し、その
ためコンクリートのワーカビリティが低下して圧送管の
閉塞を生起する。Furthermore, when lightweight concrete is pumped, water in the concrete permeates into the lightweight aggregate due to the pressure, which reduces the workability of the concrete and causes blockage of the pumping pipe.
（問題点を解決するだめの手段）
本発明はこのような問題点を解決するために提案された
もので、骨材の全量と、セメント、水及ぴ減水剤の一部
を減圧下で混練し、次いで大気圧下で同混練物にセメン
ト、水、減水剤の残量を添加、混練することを特徴とす
るコンクリートの混練方法に係るものである。(Means for Solving the Problems) The present invention was proposed to solve these problems, and involves kneading the entire amount of aggregate, cement, water, and a portion of the water reducer under reduced pressure. The present invention relates to a method for kneading concrete, which is characterized in that the remaining amounts of cement, water, and a water reducing agent are then added to the kneaded material under atmospheric pressure and kneaded.
（作用）
本発明によれば前記したように、骨材の全量とセメント
、水、及び減水剤の一部を減圧下で混練することによっ
て、骨材の表面をセメント６−ストで被覆したのち、大
気圧を導入して前記混練物とセメント、水及び減水剤の
残量とを混練するようにしたので、大気圧によって骨材
の表面の空隙にセメントイーストが圧入されて密実なセ
メント纜−スト層が形成され、そのため二次混練時にお
ける水分の吸収が防止される。(Function) According to the present invention, as described above, by kneading the entire amount of aggregate, cement, water, and a portion of the water reducing agent under reduced pressure, the surface of the aggregate is coated with cement 6-st. Since atmospheric pressure is introduced to mix the kneaded material with the remaining amount of cement, water, and water reducing agent, the cement yeast is press-fitted into the voids on the surface of the aggregate by the atmospheric pressure, forming a dense cement matrix. - A dry layer is formed, which prevents absorption of moisture during secondary kneading.
（発明の効果）
本発明の方法によれば二次混練時に添加された水分の骨
材に対する吸収が防止されるので、吸水によるワーカビ
リティの低下が防止される。(Effects of the Invention) According to the method of the present invention, water added during secondary kneading is prevented from being absorbed into the aggregate, thereby preventing a decrease in workability due to water absorption.
またこのように骨材内部に不必要な水分が含まれていな
いのでコンクリートの耐久性、特に凍結融解特性が改善
される。Furthermore, since unnecessary moisture is not contained within the aggregate, the durability of concrete, especially its freeze-thaw properties, is improved.
更にまたコンクリートポンプでコンクリートを圧送する
場合、圧力による骨材中への水分の吸収が防止されるの
で、圧送管閉塞事故が防止されるものである。Furthermore, when concrete is pumped using a concrete pump, absorption of water into the aggregate due to pressure is prevented, thereby preventing accidents of clogging of pumping pipes.
（実施例） 以下本発明を実施例について説明する。(Example) The present invention will be described below with reference to Examples.
１）−人混練
減圧状態が保持できるミキサ中に、絶乾状態の骨材全量
、セメントの一部、水の一部及び減水剤の一部を投入し
、直ちに減圧して十分く混練し、骨材の表面にセメント
を被覆する。1) - Human kneading Into a mixer that can maintain a reduced pressure state, put the total amount of bone-dry aggregate, part of the cement, part of the water, and part of the water reducing agent, immediately reduce the pressure and mix thoroughly, Cover the surface of the aggregate with cement.
Ｉ）二次混練
かくして−人混練作業が終るとミキサ内を大気圧に戻し
、残余のセメント、水及び減水剤並に各種の添加剤を投
入して更に混練し、所定のワーカビリティが得られた後
、排出する。I) Secondary kneading - After the manual kneading work is completed, the inside of the mixer is returned to atmospheric pressure, and the remaining cement, water, water reducer, and various additives are added and kneaded further to achieve the desired workability. After that, drain it.
なお前記−人混練において、毛細管現象による骨材の吸
水を防止するため、予め骨材とセメントとを空線シする
ことが望ましい。また減圧状態は圧力が低い程よいが、
２００ｍ１ｃＨ，！９以下であれば十分であって、高真
空は必要ない。In addition, in the above-mentioned manual kneading, it is desirable to dry the aggregate and cement in advance in order to prevent the aggregate from absorbing water due to capillary action. Also, the lower the pressure is, the better the decompression state is.
200m1cH,! 9 or less is sufficient and high vacuum is not necessary.
また−次、二次混練に投入するセメント、水の量は製造
すべきコンクリートの強度、及びワーカビリティによっ
て変える。Further, the amounts of cement and water to be added to the secondary mixing vary depending on the strength and workability of the concrete to be manufactured.
次に本方法の実験例を挙げる。Next, an experimental example of this method will be given.
表１
（２００） （６０） （５６１Ｘ４５１） （１，０
）註（１）供試体屋１の軽量骨材は表乾状態（２）供試
体４２．４３の軽量骨材は絶乾状態（軽量骨材はメサラ
イト使用）
（３） （）内は一次混練の配合を示す。Table 1 (200) (60) (561X451) (1,0
) Note (1) The lightweight aggregate of specimen shop 1 is surface dry (2) The lightweight aggregate of specimen 42 and 43 is bone dry (lightweight aggregate is mesalite) (3) () indicates primary kneading The composition is shown below.
供試体４１及び屓２は強制線ｂミキサで、供試体扁３は
別に５〜１０ｍＨＪＦの減圧下で一次混練したのち、二
次混練は強制練夛ミキサで行なった。Specimens 41 and 2 were mixed in a forced wire mixer, and specimen 3 was first kneaded separately under a reduced pressure of 5 to 10 mHJF, and then secondary kneading was performed in a forced kneading mixer.
表２は混練直後からのコンクリートのスランプ経時変化
と急速水中凍結融解試験の結果を示す。Table 2 shows the change in concrete slump over time immediately after mixing and the results of a rapid underwater freeze-thaw test.
表 ２
註ニスランプは混練後２時間経過後
なお耐久性指数はＡＳＴＭＫ規定されたコンクリートの
凍結、融解に対する抵抗性の試験方法で、４．４Ｃ〜−
１７，８Ｃを１サイクル２〜４時間で繰返し、試験片の
相対弾性係数が４０％低下するまで続ける。Table 2 Note: The durability index of the varnish lamp after 2 hours of mixing is 4.4C~- according to the test method for concrete freezing and thawing resistance specified by ASTMK.
17,8C is repeated for 2 to 4 hours per cycle until the relative modulus of elasticity of the specimen decreases by 40%.
上記試験結果から耐久性指数ＤＦ （％ ）は次式から
求められる。From the above test results, the durability index DF (%) is calculated from the following formula.
Ｐ：Ｎサイクルにおける相対弾性係数（％）Ｎ：試験終
了時のサイクル数
Ｎｓ：目的によって定められた試験を終了すべきサイク
ル数（通常３００サイクル）
前記の結果よシ、本方法によって混練されたコンクリー
トは従来方法で混練されたコンクリートに比して、スラ
ンプの変動は十分吸水した骨材を使用したものと同等で
あシ、また耐久性指数は絶乾状態の骨材を使用したコン
クリートよシも優れていることが判る。P: Relative modulus of elasticity in N cycles (%) N: Number of cycles at the end of the test Ns: Number of cycles to end the test determined by the purpose (usually 300 cycles) According to the above results, the material kneaded by this method Compared to concrete mixed using conventional methods, the slump fluctuations of concrete are the same as those using aggregates that have absorbed sufficient water, and the durability index is lower than that of concrete that uses bone-dry aggregates. It turns out that it is also excellent.
以上本発明を実施例について説明したが、本発明は勿論
このような実施例にだけ局限されるものではなく、本発
明の精神を逸脱しない範囲で種々改変されるもので、例
えば−次混練においてコンクリート材料を混練するのみ
ならず、コンクリートと骨材との耐着や、コンクリート
の硬化反応を阻害しない他の材料、例えばフェノール、
エポキシ樹脂等の有機物を一次混練して被覆することも
可能であシ、また混練時において熱可塑性樹脂を加熱し
ながら混練することも可能である。Although the present invention has been described above with reference to embodiments, the present invention is of course not limited to these embodiments, and can be modified in various ways without departing from the spirit of the invention. In addition to kneading concrete materials, other materials such as phenol,
It is also possible to coat by first kneading an organic substance such as an epoxy resin, and it is also possible to knead the thermoplastic resin while heating it during kneading.
Claims (1)
で混練し、次いで大気圧下で同混練物にセメント、水、
減水剤の残量を添加、混練することを特徴とするコンク
リートの混練方法。The total amount of aggregate, cement, water, and part of the water reducing agent are kneaded under reduced pressure, and then cement, water,
A concrete mixing method characterized by adding and mixing the remaining amount of a water reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP221285A JPS61162303A (en) | 1985-01-11 | 1985-01-11 | Method of kneading concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP221285A JPS61162303A (en) | 1985-01-11 | 1985-01-11 | Method of kneading concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61162303A true JPS61162303A (en) | 1986-07-23 |
Family
ID=11523040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP221285A Pending JPS61162303A (en) | 1985-01-11 | 1985-01-11 | Method of kneading concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61162303A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011068134A (en) * | 2004-09-06 | 2011-04-07 | Sika Technology Ag | Method for producing coated basic material for hydraulic composition, coated basic material for hydraulic composition, additive for hydraulic composition and method for producing hydraulic composition |
-
1985
- 1985-01-11 JP JP221285A patent/JPS61162303A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011068134A (en) * | 2004-09-06 | 2011-04-07 | Sika Technology Ag | Method for producing coated basic material for hydraulic composition, coated basic material for hydraulic composition, additive for hydraulic composition and method for producing hydraulic composition |
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