JPH0788834A - Preparation of concrete - Google Patents
Preparation of concreteInfo
- Publication number
- JPH0788834A JPH0788834A JP23621793A JP23621793A JPH0788834A JP H0788834 A JPH0788834 A JP H0788834A JP 23621793 A JP23621793 A JP 23621793A JP 23621793 A JP23621793 A JP 23621793A JP H0788834 A JPH0788834 A JP H0788834A
- Authority
- JP
- Japan
- Prior art keywords
- thickener
- concrete
- water
- powder
- kneading
- 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.)
- Withdrawn
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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
-
- 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
- C04B2103/44—Thickening, gelling or viscosity increasing agents
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]
【産業上の利用分野】本発明はコンクリートの製造方法
に係り、特に、コンクリート混練物の流動性を高め、コ
ンクリートの製造工程において、振動等による締固め工
程を不要とし、しかも、材料分離抵抗性を高め、養生後
の脱型時において高い初期強度を発現させることができ
る新規コンクリートの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing concrete, and more particularly, to improve the fluidity of a concrete kneading material, eliminating the need for a compaction step due to vibrations in the concrete production step, and further, resistance to material separation. The present invention relates to a method for producing a new concrete, which can enhance the initial strength and develop a high initial strength during demolding after curing.
【０００２】[0002]
【従来の技術】従来、コンクリートは、一般に、ポルト
ランドセメントを主成分とするセメント系粉体に、水、
骨材及び必要に応じて減水性を有する混和剤（減水剤）
等を適当量混練して比較的硬めのコンクリート混練物が
得られ、これを型枠に投入した後、或いは投入する際、
型枠中のコンクリート混練物が密実になるように振動等
の外力による締固めを十分に行ない、その後、場合によ
っては型枠の回転率を高くするために、高温養生を施
し、これにより硬化コンクリートの初期強度を高めるこ
とにより、短時間で脱型を行なって製造されている。2. Description of the Related Art Conventionally, concrete is generally made of cement-based powder containing Portland cement as a main component, water,
Aggregate and admixture (water reducing agent) having water reducing property as required
A relatively hard concrete kneaded product is obtained by kneading an appropriate amount of the above, etc., and after putting this into a mold, or when adding it,
Sufficiently perform compaction by external force such as vibration so that the concrete kneaded material in the mold becomes solid, and then, in some cases, high temperature curing is performed to increase the rotation rate of the mold, which results in hardened concrete. It is manufactured by removing the mold in a short time by increasing the initial strength of.
【０００３】上記従来のコンクリートの製造方法におい
ては、型枠に流し込んだコンクリート混練物を密実にす
るために、振動等の外力により締固めを行なっている
が、この振動締固めが不十分であると、十分な性能を有
するコンクリートが得られないという問題がある。一方
で、この締固め時の振動による騒音公害も問題となって
いる上に、人手不足に対処するため、振動締固め工程を
省きたいという要望がある。In the above-mentioned conventional method for producing concrete, in order to make the concrete kneaded product poured into the mold compact, external force such as vibration is used for compaction, but this vibration compaction is insufficient. Therefore, there is a problem that concrete having sufficient performance cannot be obtained. On the other hand, noise pollution due to vibration at the time of compaction has become a problem, and there is a demand for omitting the vibration compaction step in order to cope with the labor shortage.
【０００４】これに対し、最近になって、締固め不要の
コンクリート混練物が学会等を賑わしている。しかし、
これらのコンクリートの混練に際しては、自己充填性を
高めるため、フライアッシュ、高炉スラグ粉等の粉体を
多量に添加する必要があるため、硬化コンクリートの初
期強度が小さいという欠点を有する。このため、高温養
生により脱型時強度を大きくし、早期脱型を行なって型
枠の回転率を高めたいというコンクリート製品工場の意
向にそぐわない。On the other hand, recently, concrete kneading materials that do not require compaction have been popular in academic societies. But,
When kneading these concretes, it is necessary to add a large amount of powder such as fly ash and blast furnace slag powder in order to enhance the self-filling property, so that there is a drawback that the initial strength of the hardened concrete is small. For this reason, the concrete product factory does not meet the intention of increasing the strength during demolding by high temperature curing and performing early demolding to increase the mold rotation rate.
【０００５】一方、増粘剤を添加した配合により、コン
クリート混練物の材料分離抵抗性を高めると共に、自己
充填性を確保して締固め不要のコンクリート混練物を得
ることが可能とされる。この場合、フライアッシュや高
炉スラグ等の粉体を添加しなくても、材料分離抵抗性を
高めることができるため、高温養生等により初期に高い
強度を得ることができる。On the other hand, the addition of a thickener makes it possible to increase the material separation resistance of the concrete kneaded product and secure the self-filling property to obtain a concrete kneaded product that does not require compaction. In this case, the material separation resistance can be increased without adding powder such as fly ash or blast furnace slag, so that high strength can be initially obtained by high temperature curing or the like.
【０００６】従来、増粘剤としては各種の粉体が用いら
れているが、これらの粉体の多くは水に溶け難く、或い
は、水可溶性のものであっても溶解度の温度依存性の高
いものが多く、なかには多量の空気を連行し、空気量の
管理が難しいものもある。Conventionally, various powders have been used as a thickener, but most of these powders are hardly soluble in water, or even if they are water-soluble, their solubility is highly dependent on temperature. There are many things, and some of them carry a large amount of air and it is difficult to control the amount of air.
【０００７】[0007]
【発明が解決しようとする課題】水難溶性ないし水不溶
性の増粘剤を粉体のまま添加すると、均一分散性に劣
り、添加効果が十分に得られないことから、多量に添加
する必要があるため、コスト高となるという欠点があ
る。また、増粘剤は空気連行性があるものもあるため、
多量添加による連行空気量が多くなり、強度低下の原因
になるという欠点もある。更に、粉体の添加のために
は、現場における計量、添加作業が煩雑であるという欠
点もある。If a poorly water-soluble or water-insoluble thickener is added as a powder, the uniform dispersibility will be poor, and the effect of addition will not be sufficient, so it is necessary to add a large amount. Therefore, there is a drawback that the cost becomes high. Also, some thickeners have air entrainment, so
There is also a drawback that the amount of air entrained by adding a large amount increases, which causes a decrease in strength. Furthermore, there is a drawback that the addition and addition of the powder requires complicated on-site measurement and addition work.
【０００８】一方、溶解度の温度依存性の高い増粘剤を
水に溶解して用いる場合には、地域や季節により溶解度
が異なるものとなり、低温時には溶解不十分で所望の効
果が得られないという欠点がある。On the other hand, when a thickener whose solubility is highly temperature-dependent is used by dissolving it in water, the solubility varies depending on the region and season, and the desired effect cannot be obtained due to insufficient solubility at low temperatures. There are drawbacks.
【０００９】本発明は上記従来の問題点を解決し、セメ
ント系粉体、骨材、水及び増粘剤を混練してコンクリー
トを製造するに当り、増粘剤の添加効果を有効に発揮さ
せ、増粘剤コストの低減及び粉体添加における空気連行
性や作業性の問題を解消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。The present invention solves the above-mentioned problems of the prior art and makes it possible to effectively exert the effect of adding a thickener when kneading cement-based powder, aggregate, water and a thickener to produce concrete. An object of the present invention is to provide a method for producing concrete which reduces the cost of thickener and solves the problems of air entrainment and workability in powder addition.
【００１０】[0010]
【課題を解決するための手段】本発明のコンクリートの
製造方法は、セメント系粉体、骨材、水及び増粘剤を混
練してコンクリートを製造する方法において、増粘剤を
予めアルカリ性水溶液に溶解して添加することを特徴と
する。The method for producing concrete of the present invention is a method for producing concrete by kneading cement-based powder, aggregate, water and a thickener, wherein the thickener is previously converted into an alkaline aqueous solution. It is characterized by being dissolved and added.
【００１１】以下に本発明を詳細に説明する。The present invention will be described in detail below.
【００１２】本発明の方法において用いられる増粘剤と
しては、好ましくはセルロース系、アクリル系、又は天
然多糖類等の水溶性高分子よりなる増粘剤が挙げられ
る。ここで、天然多糖類としては、グアー、イナゴ豆、
クインスシード豆、タラ豆等の豆科植物の粉体を用いる
ことができる。The thickener used in the method of the present invention is preferably a thickener made of a water-soluble polymer such as a cellulosic, acrylic or natural polysaccharide. Here, the natural polysaccharides include guar, locust beans,
Powders of legumes such as quince seed beans and cod beans can be used.
【００１３】また、これらの増粘剤を溶解させるアルカ
リ性水溶液としては、ｐＨ１２以上のＮａＯＨ，Ｃａ
（ＯＨ）2 等のアルカリ性水溶液が使用される。Further, as an alkaline aqueous solution in which these thickeners are dissolved, NaOH, Ca having a pH of 12 or more are used.
An alkaline aqueous solution such as (OH) 2 is used.
【００１４】本発明の方法に従って、締固め不要コンク
リートを製造するには、セメント系粉体、粗骨材、細骨
材、水、高性能減水剤及び増粘剤を例えば、次の〜
のいずれかの手順で混練する。In order to produce compaction-free concrete according to the method of the present invention, cement-based powder, coarse aggregate, fine aggregate, water, high-performance water-reducing agent and thickener are used, for example:
Knead by either procedure.
【００１５】 セメント系粉体、粗骨材、細骨材、
水、高性能減水剤及び増粘剤を同時に添加混練する。 セメント系粉体、細骨材、水、高性能減水剤及び増
粘剤を添加混練した後、混練物に更に粗骨材を添加混練
する。 セメント系粉体、粗骨材、細骨材を空練りした後、
水、高性能減水剤及び増粘剤を添加混練する。 セメント系粉体、粗骨材、細骨材、水の一部、高性
能減水剤の一部及び増粘剤の一部を添加混練した後、水
の残部、高性能減水剤の残部及び増粘剤の残部を添加混
練する。Cement-based powder, coarse aggregate, fine aggregate,
Water, a superplasticizer and a thickener are added and kneaded at the same time. After cement-based powder, fine aggregate, water, high-performance water reducing agent and thickener are added and kneaded, coarse aggregate is further added to the kneaded product and kneaded. After kneading cement-based powder, coarse aggregate, fine aggregate,
Add water, superplasticizer and thickener, and knead. Cement-based powder, coarse aggregate, fine aggregate, part of water, part of high-performance water reducing agent and part of thickener are added and kneaded, and then the balance of water, the balance of high-performance water reducing agent and increase Add and knead the rest of the sticky agent.
【００１６】本発明においては、このような材料の混練
に当り、増粘剤を混練水の少なくとも一部に相当するア
ルカリ性水溶液に溶解させて添加すれば良い。なお、高
性能減水剤も混練水に溶解して添加する場合もある。In the present invention, when kneading such materials, the thickener may be added after being dissolved in an alkaline aqueous solution corresponding to at least a part of the kneading water. The high-performance water reducing agent may be added after being dissolved in the kneading water.
【００１７】混練時間は、用いるミキサーの性能にもよ
るが、総混練時間が１分以上であることが好ましい。The kneading time depends on the performance of the mixer used, but the total kneading time is preferably 1 minute or more.
【００１８】調製されたコンクリート混練物は、振動等
の外力による締固めを行なうことなく、型枠に流し込み
成形することができる。流し込み成形後は、現場打設の
場合、気中養生、散水養生、シート養生等を行い、コン
クリート製品の場合は 常圧で最高温度３５〜９５℃の常圧高温養生。The prepared concrete kneaded product can be cast into a mold without compaction by an external force such as vibration. After casting, when cast on site, air curing, sprinkling curing, sheet curing, etc. are performed, and for concrete products, atmospheric pressure and high temperature curing with a maximum temperature of 35 to 95 ° C at atmospheric pressure.
【００１９】又は １気圧以上１００℃以上の高温高圧養生。Alternatively, high temperature and high pressure curing of 1 atm or more and 100 ° C. or more.
【００２０】を行なう。Execute
【００２１】なお、本発明において、セメント系粉体と
しては、ポルトランドセメント単味、もしくは、フライ
アッシュ、高炉スラグ粉末、天然鉱物粉等の粉体の１種
又は２種以上と、ポルトランドセメントとの混合粉体が
挙げられる。フライアッシュ等を併用する場合、その割
合はポルトランドセメント１００重量部に対して５０重
量部以下とするのが好ましい。セメント系粉体量として
は３００ｋｇ／ｍ3 以上が好ましく、初期強度を考慮し
た場合、４００ｋｇ／ｍ3 以上が好ましい。In the present invention, the cement-based powder includes Portland cement alone, or one or more of powders such as fly ash, blast furnace slag powder and natural mineral powder, and Portland cement. Examples include mixed powders. When fly ash or the like is used in combination, the proportion thereof is preferably 50 parts by weight or less with respect to 100 parts by weight of Portland cement. The amount of cement-based powder is preferably 300 kg / m 3 or more, and when initial strength is taken into consideration, it is preferably 400 kg / m 3 or more.
【００２２】増粘剤の添加量は少な過ぎると十分な分離
抵抗性が得られず、多過ぎると流動性が損なわれる。従
って、増粘剤は用いる混練水に対して０．０１〜１重量
％程度とするのが好ましい。If the amount of the thickener added is too small, sufficient separation resistance cannot be obtained, and if it is too large, the fluidity is impaired. Therefore, it is preferable that the thickener is used in an amount of about 0.01 to 1% by weight based on the kneading water used.
【００２３】高性能減水剤の添加量は、少な過ぎると流
動性が不足し、多過ぎると分離抵抗性が損なわれる。従
って、減水剤は、セメント系粉体に対して０．１〜１０
重量％、特に１．０〜５重量％とするのが好ましい。使
用する減水剤としては、従来一般的に用いられているも
のをいずれも好適に使用することができる。例えばナフ
タレンスルホン酸ホルマリン高縮合物塩系の高性能減水
剤、メラミンスルホン酸系の高性能減水剤、ポリカルボ
ン酸塩系高分子化合物系高性能ＡＥ減水剤、リグニンス
ルホン酸塩系ＡＥ減水剤、オキシカルボン酸塩系ＡＥ減
水剤などである。If the amount of the high-performance water reducing agent added is too small, the fluidity will be insufficient, and if it is too large, the separation resistance will be impaired. Therefore, the water reducing agent is 0.1 to 10 relative to the cement-based powder.
It is preferably in the range of 1.0 to 5% by weight, particularly 1.0 to 5% by weight. As the water-reducing agent to be used, any of those conventionally used generally can be preferably used. For example, naphthalene sulfonate formalin high-condensation salt-based high-performance water reducing agent, melamine sulfonic acid-based high-performance water reducing agent, polycarboxylic acid salt-based polymer compound high-performance AE water reducing agent, lignin sulfonate-based AE water reducing agent, Examples include oxycarboxylate-based AE water reducing agents.
【００２４】なお、セメント系粉体に対する骨材や混練
水の量は、従来と同様の割合とすることができるが、粗
骨材に対する細骨材の割合を多めにするほうが好まし
い。The amount of aggregate and kneading water with respect to the cement-based powder can be the same as in the conventional case, but it is preferable to increase the ratio of fine aggregate to coarse aggregate.
【００２５】[0025]
【作用】前述の如く、増粘剤は、水に溶け難いが、水可
溶性であっても溶解度の温度依存性の高いものが多い
が、アルカリ性水溶液であれば、殆どの増粘剤を溶解可
能であり、しかも、溶解度の温度依存性も小さく、低温
時でも安定な水溶液とすることができる。As described above, most of the thickeners are difficult to dissolve in water, but even if they are water-soluble, their solubility is highly temperature-dependent, but most alkaline solutions can dissolve most thickeners. Moreover, the temperature dependence of the solubility is small, and a stable aqueous solution can be obtained even at low temperatures.
【００２６】このため、増粘剤をアルカリ性水溶液とし
て添加することにより、増粘剤を温度に影響されること
なく安定な液体として作業性を良くすることが、また、
連行空気の問題も無くすことが可能となり、少ない添加
量にて増粘剤の添加効果を十分に発揮させて優れた効果
を得ることができる。Therefore, by adding the thickener as an alkaline aqueous solution, it is possible to improve the workability of the thickener as a stable liquid without being affected by temperature.
It is possible to eliminate the problem of entrained air, and the effect of adding the thickener can be sufficiently exerted with a small amount of addition, and an excellent effect can be obtained.
【００２７】本発明によれば、コンクリート混練物に高
い流動性を確保するために、一般的に使用されている高
性能（ＡＥ）減水剤を添加すると共に、分離抵抗性を確
保するために増粘剤をアルカリ性水溶液に溶解して添加
することにより、コンクリート混練物を型枠に流し込む
際に振動等の外力による締固め工程を省略できる締固め
不要コンクリート混練物を得ることができる。本発明で
は、増粘剤の優れた添加効果により、初期強度に寄与し
ないフライアッシュや高炉スラグ粉等の粉体を混入させ
ることなく、或いは、その混入量を低く抑えて、コンク
リート混練物の分離抵抗性を確保することができ、しか
も、増粘剤を液体として添加することにより、コンクリ
ート混練物への空気泡の巻き込みを少なくして、従来問
題となっていた初期強度の低さを克服し、十分な脱型時
強度を確保すると共に、空気量の管理を容易にすること
を可能とする。According to the present invention, a commonly used high-performance (AE) water-reducing agent is added in order to ensure high fluidity in a concrete kneaded product, and an increase is added in order to ensure separation resistance. By adding the viscous agent after dissolving it in the alkaline aqueous solution, it is possible to obtain a compaction-free concrete kneaded product which can omit the compaction step by external force such as vibration when the concrete kneaded product is poured into the mold. In the present invention, due to the excellent addition effect of the thickener, without mixing powder such as fly ash and blast furnace slag powder that do not contribute to the initial strength, or by suppressing the mixing amount low, the separation of concrete kneaded materials Resistance can be ensured, and by adding a thickener as a liquid, the inclusion of air bubbles in the concrete kneaded product can be reduced and the low initial strength, which has been a problem in the past, can be overcome. It is possible to secure sufficient strength during demolding and to easily manage the air amount.
【００２８】[0028]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明するが、本発明はその要旨を超えない限
り、以下の実施例に限定されるものではない。EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples unless it exceeds the gist.
【００２９】なお、実施例及び比較例における使用材料
は以下の通りである。Materials used in Examples and Comparative Examples are as follows.
【００３０】セメント系粉体： 早強ポルトランドセメント（以下「Ｈセメント」と称
す。） 普通ポルトランドセメント（以下「Ｎセメント」と称
す。） フライアッシュ（火力発電所産、ブレーン値３１８０ｃ
ｍ2/ｇ。（以下「ＦＡ」と称す。） 増粘剤： 豆科植物グアーよりなる天然多糖類（以下「グアー粉」
と称す。）（粒径３０μｍ以下、分子量約２０万） 豆科植物イナゴ豆よりなる天然多糖類（以下「イナゴ
粉」と称す。）（粒径３０μｍ以下、分子量約３０万） ザンサンガム メチルセルロース（以下「ＭＣ」と称す。） 高性能減水剤： Ａ＝ナフタレンスルホン酸ホルマリン高縮合物塩系の高
性能減水剤 Ｂ＝メラミンスルホン酸系の高性能減水剤 細骨材：木更津産山砂（表乾比重２．６２，吸水率１．
５６，粗粒率２．９７） 粗骨材：八王子産砕石（最大寸法２０ｍｍ，表乾比重
２．６７，吸水率０．６０，粗粒率６．１０） 実施例１〜１１ パン型強制練りミキサでＨセメント又はＮセメント、細
骨材及び粗骨材を３０秒間空練りした後、ｐＨ１３のＮ
ａＯＨ水溶液に増粘剤を溶解したものと高性能減水剤を
含む混練水を加えつつ２分間混練して表１に示す配合の
コンクリート混練物とした。なお、コンクリートの練上
り温度は２０℃とした。Cement-based powder: Early strength Portland cement (hereinafter referred to as "H cement") Ordinary Portland cement (hereinafter referred to as "N cement") Fly ash (produced at thermal power plant, Blaine value 3180c)
m 2 / g. (Hereinafter referred to as "FA") Thickener: Natural polysaccharide composed of legume guar (hereinafter referred to as "guar powder")
Called. ) (Particle size 30 μm or less, molecular weight about 200,000) Natural polysaccharides composed of legume locust beans (hereinafter referred to as “locust flour”) (Particle size 30 μm or less, molecular weight about 300,000) Zansan gum methylcellulose (hereinafter “MC”) High-performance water reducing agent: A = high-performance water reducing agent of naphthalene sulfonic acid formalin high condensation product salt B = high-performance water reducing agent of melamine sulfonic acid fine aggregate: Kisarazu Sanzan (surface dry specific gravity 2.62) , Water absorption 1.
56, coarse grain ratio 2.97) Coarse aggregate: crushed stone from Hachioji (maximum size 20 mm, surface dry specific gravity 2.67, water absorption 0.60, coarse grain ratio 6.10) Examples 1 to 11 Bread type forced kneading After H-cement or N-cement, fine aggregate and coarse aggregate are kneaded with a mixer for 30 seconds, N of pH 13
A concrete mixture having the composition shown in Table 1 was prepared by kneading for 2 minutes while adding a mixture of a thickening agent dissolved in an aOH aqueous solution and kneading water containing a high-performance water reducing agent. The kneading temperature of concrete was 20 ° C.
【００３１】このコンクリート混練物を、振動を加えず
に型枠に流し込み成形し、流し込んだ後も振動等の外力
による締固めを行なわず、以下の条件で蒸気養生を行な
い、流し込み成形後から１７時間後の圧縮強度を測定し
た。This concrete kneaded product is cast into a mold without applying vibration, and after casting, steam curing is performed under the following conditions without compaction by external force such as vibration. The compressive strength after time was measured.
【００３２】蒸気養生条件 前置き：２０℃，３時間 昇温 ：毎時１０℃ 保持 ：６０℃，３時間 降温 ：毎時１０℃ また、フレッシュ性状（スランプフロー、空気量、分離
抵抗性）を調べた。 Steam curing conditions Preliminary: 20 ° C., 3 hours Temperature rising: 10 ° C./hour Holding: 60 ° C., 3 hours Cooling: 10 ° C./hour Further, fresh properties (slump flow, air content, separation resistance) were examined.
【００３３】なお、材料の分離抵抗性は、Ｌ型フロー試
験器により測定し、（投入部の粗骨材率（％））−（流
れ先端部の粗骨材率（％））が５％以内を○○，５〜１
０％を○，１０〜１５％を△，１５％以上を×とした。The separation resistance of the material was measured by an L-type flow tester, and the ratio (rough aggregate ratio (%) at the input portion)-(rough aggregate ratio (%) at the flow front portion) was 5%. Within ○○, 5 to 1
0% was evaluated as ◯, 10 to 15% was evaluated as Δ, and 15% or more was evaluated as x.
【００３４】結果を表１に示す。The results are shown in Table 1.
【００３５】実施例１２ コンクリート練上り温度を５℃とし、表１に示す配合と
したこと以外は、実施例１と同様に行なって、フレッシ
ュ性状及び圧縮強度を調べ、結果を表１に示した。Example 12 The fresh property and the compressive strength were examined in the same manner as in Example 1 except that the concrete kneading temperature was 5 ° C. and the composition shown in Table 1 was used, and the results are shown in Table 1. .
【００３６】比較例１ グアー粉を粉体のまま添加し、表１に示すコンクリート
配合としたこと以外は、実施例１と同様に行なって、フ
レッシュ性状及び圧縮強度を調べ、結果を表１に示し
た。Comparative Example 1 The fresh properties and compressive strength were examined in the same manner as in Example 1 except that the guar powder was added as powder and the concrete composition shown in Table 1 was used. Indicated.
【００３７】比較例２ ＭＣを粉体のまま添加し、表１に示すコンクリート配合
としたこと以外は、実施例１と同様に行なって、フレッ
シュ性状及び圧縮強度を調べ、結果を表１に示した。Comparative Example 2 Fresh properties and compressive strength were examined in the same manner as in Example 1 except that MC was added as powder and the concrete composition shown in Table 1 was used. The results are shown in Table 1. It was
【００３８】比較例３ コンクリート練上り温度を５℃とし、表１に示す配合と
したこと以外は、比較例１と同様に行なって、フレッシ
ュ性状及び圧縮強度を調べ、結果を表１に示した。Comparative Example 3 The fresh property and the compressive strength were examined in the same manner as in Comparative Example 1 except that the concrete kneading temperature was 5 ° C. and the composition shown in Table 1 was used, and the results are shown in Table 1. .
【００３９】比較例４ グアー粉を用いずにフライアッシュを用い、表１に示す
配合としたこと以外は実施例１と同様に行なって、フレ
ッシュ性状及び圧縮強度を調べ、結果を表１に示した。Comparative Example 4 Fresh properties and compressive strength were examined in the same manner as in Example 1 except that fly ash was used without using guar powder and the composition shown in Table 1 was used, and the results are shown in Table 1. It was
【００４０】[0040]
【表１】 [Table 1]
【００４１】表１より次のことが明らかである。The following is clear from Table 1.
【００４２】即ち、増粘剤（グアー粉）を用いない比較
例４では、分離抵抗性の確保のため多量にフライアッシ
ュを配合する必要があり、初期強度が小さい。That is, in Comparative Example 4 in which the thickener (guar powder) is not used, it is necessary to add a large amount of fly ash in order to secure the separation resistance, and the initial strength is small.
【００４３】グアー粉を粉体のまま添加した比較例１，
３のうち、比較例１では、良好な結果を得るために大量
のグアー粉を必要とする。また、低温にてグアー粉を粉
体のまま添加した場合には、グアー粉による効果が得ら
れず、材料分離が非常に大きく、強度も劣る。Comparative Example 1 in which guar powder was added as powder
Of Comparative Examples 3, Comparative Example 1 requires a large amount of guar flour to obtain good results. Further, when the guar powder is added as a powder at a low temperature, the effect of the guar powder cannot be obtained, the material separation is very large, and the strength is poor.
【００４４】これに対して、本発明の方法によれば、低
温であっても著しく優れた効果が得られる。On the other hand, according to the method of the present invention, a remarkably excellent effect can be obtained even at a low temperature.
【００４５】なお、比較例２では、空気を連行しやすい
ため、空気量が多くなる。これに対して、本発明によれ
ば、連行空気量を少なくする効果が得られる。In Comparative Example 2, since the air is easily carried, the amount of air increases. On the other hand, according to the present invention, the effect of reducing the amount of entrained air can be obtained.
【００４６】[0046]
【発明の効果】以上詳述した通り、本発明のコンクリー
トの製造方法によれば、少ない増粘剤使用量にて、良好
な作業性のもとに、作業温度に影響を受けることなく、
材料分離抵抗性に優れ、連行空気量が少なく、初期強度
の高い締め固め不要のコンクリートを製造することがで
きる。As described in detail above, according to the method for producing concrete of the present invention, a small amount of thickener is used, good workability is obtained, and the work temperature is not affected.
It is possible to manufacture concrete that has excellent resistance to material separation, has a small amount of entrained air, and has high initial strength and does not require compaction.
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 24:30 Ｄ 14:02） Ｚ 103:32 103:44 Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display area C04B 24:30 D 14:02) Z 103: 32 103: 44
Claims (1)
混練してコンクリートを製造する方法において、増粘剤
を予めアルカリ性水溶液に溶解して添加することを特徴
とするコンクリートの製造方法。1. A method for producing concrete by kneading a cement-based powder, an aggregate, water and a thickening agent, wherein the thickening agent is dissolved in an alkaline aqueous solution in advance and added. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23621793A JPH0788834A (en) | 1993-09-22 | 1993-09-22 | Preparation of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23621793A JPH0788834A (en) | 1993-09-22 | 1993-09-22 | Preparation of concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0788834A true JPH0788834A (en) | 1995-04-04 |
Family
ID=16997521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23621793A Withdrawn JPH0788834A (en) | 1993-09-22 | 1993-09-22 | Preparation of concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0788834A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019048421A (en) * | 2017-09-11 | 2019-03-28 | 太平洋セメント株式会社 | Method of producing concrete |
-
1993
- 1993-09-22 JP JP23621793A patent/JPH0788834A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019048421A (en) * | 2017-09-11 | 2019-03-28 | 太平洋セメント株式会社 | Method of producing concrete |
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