WO2019088150A1 - Method for improving flowability of fresh concrete - Google Patents
Method for improving flowability of fresh concrete Download PDFInfo
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- WO2019088150A1 WO2019088150A1 PCT/JP2018/040447 JP2018040447W WO2019088150A1 WO 2019088150 A1 WO2019088150 A1 WO 2019088150A1 JP 2018040447 W JP2018040447 W JP 2018040447W WO 2019088150 A1 WO2019088150 A1 WO 2019088150A1
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- fresh concrete
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
Definitions
- the present invention relates to a method for improving the fluidity of concrete, and the like.
- Fresh concrete Concrete is first manufactured in a concrete manufacturing plant in the state of so-called fresh concrete (hereinafter referred to as "fresh concrete"), which retains its fluidity before setting.
- Fresh concrete is used on site after being transported using an agitator car (hereinafter referred to as "fresh concrete car").
- fresh concrete car an agitator car
- rotation of the drum is given to keep as fluid as possible.
- work is done to pump raw concrete.
- the higher the fluidity of the ready-mixed concrete the higher the pressure and the easier it is to pump.
- the pumping operation can be performed more efficiently in a short time.
- the method of increasing the rate of addition of the setting retarder and water is useful in delaying the time until the raw concrete sets.
- these techniques will change the content ratio of raw concrete itself.
- the strength and durability of the concrete itself may be affected to some extent. Therefore, there are naturally limits to the application of the retarder and water addition technology. Therefore, it is desirable to have a technology that can delay the setting of fresh concrete without affecting the composition of concrete itself.
- the inventor found that by settling a predetermined solid body (magnetic body) in the vicinity of a fresh concrete, it delays the time until the setting of the fresh concrete and improves the formation ability, and completes the invention It is Furthermore, the inventor prevents deterioration (unexpected setting, etc.) of the cement powder and also improves the flowability by leaving a predetermined solid body to stand even for cement powder before fresh concrete production, It is thought that the fluidity of the fresh concrete manufactured in can be improved, and the invention is completed.
- the present invention has the following configuration.
- the first configuration of the present invention is a method of improving fluidity of fresh concrete characterized in that the fluidity of the fresh concrete is improved and the setting is delayed by leaving the magnetic body in the vicinity of the fresh concrete.
- the second configuration of the present invention is the method for improving fluidity of fresh concrete according to the first configuration, which further improves the ability to form concrete after setting.
- the third configuration of the present invention is the fresh concrete according to the first or second configuration, wherein the vicinity of the fresh concrete is any one of a plurality of fresh concrete pump tubes, fresh concrete pump cars, agitator cars, and transport unicycles. It is a method to improve liquidity.
- the fourth configuration of the present invention is a cement powder deterioration preventing method characterized in that deterioration of cement powder is prevented and fluidity is improved by allowing a magnetic body to stand in the vicinity of cement powder.
- a fifth configuration of the present invention is a method for improving fluidity of fresh concrete characterized in that the fluidity of fresh concrete is improved by using the cement powder described in the fourth configuration.
- a sixth structure of the present invention is the magnetic body according to any one of the first to fifth structures, which is produced by coagulating metal powder containing a magnetic metal component, and is characterized by the fact that it is a fluid of fresh concrete It is a magnetic substance for improvement.
- the metal powder comprises iron (Fe), copper (Cu), aluminum (Al), nickel (Ni), cobalt (Co), boron (B), these metal components (these metals It is a magnetic body for the fluidity
- the present invention it has become possible to provide a method for delaying the time until the raw concrete condenses without affecting the raw concrete composition. That is, according to the method of using the fresh concrete of the present invention, it is possible to delay the time until the fresh concrete condenses by only allowing a predetermined solid body (magnetic body) to stand in the vicinity of the fresh concrete, It becomes possible to improve the formation ability of the concrete after hardening.
- Figure showing the production of fresh concrete using a transport unicycle with a magnetic body set aside Figure showing fresh concrete after production put into slump cone The figure which showed the appearance of the fresh concrete in the example
- a diagram showing the appearance of fresh concrete in a comparative example The figure which compared the appearance of an example and a comparative example with the same photograph
- the method of using the fresh concrete according to the present invention is characterized in that the fluidity of the fresh concrete is improved and the setting is delayed by leaving the magnetic material for construction (solid body, ENE) in the vicinity of the fresh concrete. Moreover, in the usage method of the fresh concrete of this invention, it can further be used as what improves the formation ability of the concrete after hardening.
- the method of using fresh concrete according to the present invention may be applied to fresh concrete that is usually used as a construction material. That is, it may be used in cement, water, fine aggregate, coarse aggregate, admixture, and fresh concrete containing these as components.
- other components such as a coagulant may be included as long as the content of the other components is not completely eliminated and the present invention aims to improve the setting delay or formation ability when the magnetic substance is left.
- the magnetic substance used in the present invention may be one having a normal performance as a magnetic substance, and for example, a solid ENE (ena) may be used as a product.
- a solid ENE ena
- the magnetic substance used in the present invention is produced by condensing metal powder acting as a magnetic substance by applying heat or the like.
- metal powder includes, for example, iron (Fe), copper (Cu), aluminum (Al), nickel (Ni), cobalt (Co), boron (B), and these metal components (these metal elements are included as constituent elements) Or a combination of two or more thereof.
- the vicinity is defined as a distance as close as possible although not in direct contact with fresh concrete. That is, pumping pipes such as piping and hoses to which fresh concrete is pumped, pumps of fresh concrete pump cars, drums of fresh concrete cars, loading beds of transportation unicycles, and distances of several centimeters to tens of centimeters of these physical media.
- the magnetic body may be suspended or attached and left to stand. Also, in the case of applying to cement powder, similarly, the magnetic material may be left in the vicinity of the cement powder.
- the magnetic material may be left in the vicinity of the fresh concrete in such a manner as not to be an obstacle for operation in any of the manufacturing process, the transporting process, and the using process.
- it may be placed in a delivery pipe of fresh concrete, an agitator car (raw concrete car), a fresh concrete pump car, a transportation unicycle, or the like in the vicinity thereof.
- a ball-shaped magnetic body is suspended and left standing on the outside or outer frame of a pressure-feeding tube etc., or pasted by tape etc, etc. do it.
- the magnetic material may be allowed to stand at a plurality of locations, one to two or more locations on the transportation unicycle.
- the size or shape of the magnetic body to be set may be set as well, and typically, a spherical or elliptic spherical magnetic body having a diameter of several cm to several tens cm may be used. .
- FIG. 2 After standing for about 30 minutes from the production of fresh concrete, each fresh concrete was placed in a slump cone (Fig. 2). 3. The state in which the slump cone is removed immediately after being put in the slump cone is shown in FIG. 3 and FIG. FIG. 3 shows the appearance of the comparative example, and FIG. 4 shows the appearance of the embodiment.
- the formation of fresh concrete was more advanced than the comparative example, so the overall spread was less.
- Table 1 shows the results of comparing the slump values 0 and 30 minutes after production. From this, it is the result that the slump value is higher in the example than in the comparative example. 4. From this result, it was found that the formation ability is excellent in the examples.
- Tables 2 and 3 show the results of comparative tests of the respective concrete strengths.
- Table 2 shows the comparative example
- Table 3 shows the result of the concrete strength of each example.
- (3) In all cases, although the value was higher in the comparative example, there was no significant difference in the examples, and the examples were sufficiently provided with the standard strength (blending preliminary strength 24.0 N / m 2 ).
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
[Problem] A method that has as little effect on ready-mix concrete composition as possible, delays the time until setting of ready-mix concrete, and improves the flowability of ready-mix concrete. [Solution] A fresh concrete use method characterized in that the flowability of fresh concrete is improved and setting thereof is delayed by placing a magnetic material near the fresh concrete. As a result of said method, it is possible to delay the time until setting of the fresh concrete and improve the formability of the concrete after curing by simply placing a magnetic material near the fresh concrete.
Description
本発明は，コンクリートの流動性改善方法等に関する。
The present invention relates to a method for improving the fluidity of concrete, and the like.
コンクリートは，まず，凝結する前の流動性を保持した，いわゆるフレッシュコンクリート（以下，「生コン」）の状態で，コンクリート製造工場において製造される。
Concrete is first manufactured in a concrete manufacturing plant in the state of so-called fresh concrete (hereinafter referred to as "fresh concrete"), which retains its fluidity before setting.
生コンは，アジテータ車（以下，「生コン車」）を使って運ばれた後，現場で使用される。当然のことながら，生コンは何もしない状態では固まってしまうため，生コン車での運搬中はドラムに回転を与え可能な限り流動性を保つことが行われる。また，そうであっても生コンの流動性は徐々に低下し凝結しやすくなるため，できる限り速やかに生コンを使用現場まで運ぶことが好ましい。
加えて，現場においては，生コンを圧送する作業が行われる。この圧送作業を行う際も生コンの流動性が高ければ高いほど圧力がかからず圧送しやすくなり，結果として，短い時間でより効率的に圧送作業を行うことが可能となる。
一般的に，生コンが工場から運搬され現場で使用されるまでは９０分程度で行うことが好ましいとされており，この時間内で生コンの運搬，圧送，現場作業を行う必要がある。 Fresh concrete is used on site after being transported using an agitator car (hereinafter referred to as "fresh concrete car"). As a matter of course, since fresh concrete is solidified without doing anything, during transport by a fresh concrete car, rotation of the drum is given to keep as fluid as possible. Even so, it is preferable to transport the ready-mixed concrete to the site of use as soon as possible, because the fluidity of the ready-mixed concrete gradually decreases and it becomes easy to condense.
In addition, at the site, work is done to pump raw concrete. Also when performing this pumping operation, the higher the fluidity of the ready-mixed concrete, the higher the pressure and the easier it is to pump. As a result, the pumping operation can be performed more efficiently in a short time.
Generally, it is preferable to take about 90 minutes until fresh concrete is transported from the factory and used on the site, and it is necessary to carry, pump, and carry out on-site work of fresh concrete within this time.
加えて，現場においては，生コンを圧送する作業が行われる。この圧送作業を行う際も生コンの流動性が高ければ高いほど圧力がかからず圧送しやすくなり，結果として，短い時間でより効率的に圧送作業を行うことが可能となる。
一般的に，生コンが工場から運搬され現場で使用されるまでは９０分程度で行うことが好ましいとされており，この時間内で生コンの運搬，圧送，現場作業を行う必要がある。 Fresh concrete is used on site after being transported using an agitator car (hereinafter referred to as "fresh concrete car"). As a matter of course, since fresh concrete is solidified without doing anything, during transport by a fresh concrete car, rotation of the drum is given to keep as fluid as possible. Even so, it is preferable to transport the ready-mixed concrete to the site of use as soon as possible, because the fluidity of the ready-mixed concrete gradually decreases and it becomes easy to condense.
In addition, at the site, work is done to pump raw concrete. Also when performing this pumping operation, the higher the fluidity of the ready-mixed concrete, the higher the pressure and the easier it is to pump. As a result, the pumping operation can be performed more efficiently in a short time.
Generally, it is preferable to take about 90 minutes until fresh concrete is transported from the factory and used on the site, and it is necessary to carry, pump, and carry out on-site work of fresh concrete within this time.
コンクリートのこのような特徴から，生コンの流動性をできる限り長く保持するとともに，生コンが凝結するまでの時間を遅延させることができれば，運搬・圧送・現場作業の時間を長くとれることから好ましい。この凝結遅延を目的として，生コンに凝結遅延のための薬剤を加えたり，水の添加率をあげたりする技術が開示されている（特許文献１）。
From such characteristics of concrete, it is preferable to maintain the fluidity of the ready-mixed concrete as long as possible and to delay the time until the ready-mixed concrete condenses, since the time for transportation, pumping and field work can be extended. For the purpose of delaying the setting, there is disclosed a technique of adding an agent for delaying the setting to fresh concrete and raising the rate of addition of water (Patent Document 1).
凝結遅延剤や水の添加率を上げる手法は，生コンが凝結するまでの時間を遅延させる点において有用である。
しかるにこれらの技術は，生コンそのものの含有成分比率を変えてしまうこととなる。その結果，場合によっては，コンクリートそのものの強度や耐久性に少なからず影響を及ぼしかねない。そのため，凝結遅延剤や水添加率上昇の技術の適用については，おのずと限界が生じるものである。
よって，コンクリートの組成そのものには影響を及ぼさず，生コンの凝結遅延が可能な技術が望まれる。 The method of increasing the rate of addition of the setting retarder and water is useful in delaying the time until the raw concrete sets.
However, these techniques will change the content ratio of raw concrete itself. As a result, in some cases, the strength and durability of the concrete itself may be affected to some extent. Therefore, there are naturally limits to the application of the retarder and water addition technology.
Therefore, it is desirable to have a technology that can delay the setting of fresh concrete without affecting the composition of concrete itself.
しかるにこれらの技術は，生コンそのものの含有成分比率を変えてしまうこととなる。その結果，場合によっては，コンクリートそのものの強度や耐久性に少なからず影響を及ぼしかねない。そのため，凝結遅延剤や水添加率上昇の技術の適用については，おのずと限界が生じるものである。
よって，コンクリートの組成そのものには影響を及ぼさず，生コンの凝結遅延が可能な技術が望まれる。 The method of increasing the rate of addition of the setting retarder and water is useful in delaying the time until the raw concrete sets.
However, these techniques will change the content ratio of raw concrete itself. As a result, in some cases, the strength and durability of the concrete itself may be affected to some extent. Therefore, there are naturally limits to the application of the retarder and water addition technology.
Therefore, it is desirable to have a technology that can delay the setting of fresh concrete without affecting the composition of concrete itself.
上記事情を背景として本発明では，生コン組成に影響を及ぼさず，生コンが凝結するまでの時間を遅延させる方法の開発を課題とする。
In the background of the above-mentioned circumstances, in the present invention, it is an object to develop a method of delaying the time until the raw concrete condenses without affecting the raw concrete composition.
発明者は，鋭意研究の結果，所定の固形体（磁性体）を生コン近傍に静置することで，生コンの凝結までの時間を遅延させるとともに，形成能を向上させることを見出し，発明を完成させたものである。
さらに発明者は，フレッシュコンクリート製造前のセメント粉に対しても，所定の固形体を静置することにより，セメント粉の劣化（予期せぬ凝結など）を防止するとともに流動性を改善し，その後に製造したフレッシュコンクリートの流動性を高めうることに想到し，発明を完成させたものである。 As a result of earnest research, the inventor found that by settling a predetermined solid body (magnetic body) in the vicinity of a fresh concrete, it delays the time until the setting of the fresh concrete and improves the formation ability, and completes the invention It is
Furthermore, the inventor prevents deterioration (unexpected setting, etc.) of the cement powder and also improves the flowability by leaving a predetermined solid body to stand even for cement powder before fresh concrete production, It is thought that the fluidity of the fresh concrete manufactured in can be improved, and the invention is completed.
さらに発明者は，フレッシュコンクリート製造前のセメント粉に対しても，所定の固形体を静置することにより，セメント粉の劣化（予期せぬ凝結など）を防止するとともに流動性を改善し，その後に製造したフレッシュコンクリートの流動性を高めうることに想到し，発明を完成させたものである。 As a result of earnest research, the inventor found that by settling a predetermined solid body (magnetic body) in the vicinity of a fresh concrete, it delays the time until the setting of the fresh concrete and improves the formation ability, and completes the invention It is
Furthermore, the inventor prevents deterioration (unexpected setting, etc.) of the cement powder and also improves the flowability by leaving a predetermined solid body to stand even for cement powder before fresh concrete production, It is thought that the fluidity of the fresh concrete manufactured in can be improved, and the invention is completed.
本発明は，以下の構成からなる。
本発明の第一の構成は，フレッシュコンクリート近傍に磁性体を静置することにより，フレッシュコンクリートの流動性を向上させるとともに凝結を遅延させることを特徴とするフレッシュコンクリート流動性改善方法である。
本発明の第二の構成は，さらに，凝結後のコンクリートの形成能を向上させる第一の構成に記載のフレッシュコンクリート流動性改善方法である。
本発明の第三の構成は，フレッシュコンクリート近傍が，フレッシュコンクリートの圧送管，生コンポンプ車，アジテータ車，運搬用一輪車のいずれか複数の近傍である第一又は第二の構成に記載のフレッシュコンクリート流動性改善方法である。 The present invention has the following configuration.
The first configuration of the present invention is a method of improving fluidity of fresh concrete characterized in that the fluidity of the fresh concrete is improved and the setting is delayed by leaving the magnetic body in the vicinity of the fresh concrete.
The second configuration of the present invention is the method for improving fluidity of fresh concrete according to the first configuration, which further improves the ability to form concrete after setting.
The third configuration of the present invention is the fresh concrete according to the first or second configuration, wherein the vicinity of the fresh concrete is any one of a plurality of fresh concrete pump tubes, fresh concrete pump cars, agitator cars, and transport unicycles. It is a method to improve liquidity.
本発明の第一の構成は，フレッシュコンクリート近傍に磁性体を静置することにより，フレッシュコンクリートの流動性を向上させるとともに凝結を遅延させることを特徴とするフレッシュコンクリート流動性改善方法である。
本発明の第二の構成は，さらに，凝結後のコンクリートの形成能を向上させる第一の構成に記載のフレッシュコンクリート流動性改善方法である。
本発明の第三の構成は，フレッシュコンクリート近傍が，フレッシュコンクリートの圧送管，生コンポンプ車，アジテータ車，運搬用一輪車のいずれか複数の近傍である第一又は第二の構成に記載のフレッシュコンクリート流動性改善方法である。 The present invention has the following configuration.
The first configuration of the present invention is a method of improving fluidity of fresh concrete characterized in that the fluidity of the fresh concrete is improved and the setting is delayed by leaving the magnetic body in the vicinity of the fresh concrete.
The second configuration of the present invention is the method for improving fluidity of fresh concrete according to the first configuration, which further improves the ability to form concrete after setting.
The third configuration of the present invention is the fresh concrete according to the first or second configuration, wherein the vicinity of the fresh concrete is any one of a plurality of fresh concrete pump tubes, fresh concrete pump cars, agitator cars, and transport unicycles. It is a method to improve liquidity.
本発明の第四の構成は，セメント粉の近傍に磁性体を静置することにより，セメント粉の劣化を防止および流動性を改善することを特徴とするセメント粉劣化防止方法である。
本発明の第五の構成は，第四の構成に記載のセメント粉を用いて製造することにより，フレッシュコンクリートの流動性を改善させたことを特徴とするフレッシュコンクリート流動性改善方法である。 The fourth configuration of the present invention is a cement powder deterioration preventing method characterized in that deterioration of cement powder is prevented and fluidity is improved by allowing a magnetic body to stand in the vicinity of cement powder.
A fifth configuration of the present invention is a method for improving fluidity of fresh concrete characterized in that the fluidity of fresh concrete is improved by using the cement powder described in the fourth configuration.
本発明の第五の構成は，第四の構成に記載のセメント粉を用いて製造することにより，フレッシュコンクリートの流動性を改善させたことを特徴とするフレッシュコンクリート流動性改善方法である。 The fourth configuration of the present invention is a cement powder deterioration preventing method characterized in that deterioration of cement powder is prevented and fluidity is improved by allowing a magnetic body to stand in the vicinity of cement powder.
A fifth configuration of the present invention is a method for improving fluidity of fresh concrete characterized in that the fluidity of fresh concrete is improved by using the cement powder described in the fourth configuration.
本発明の第六の構成は，第一ないし第五の構成いずれかに記載の磁性体であって，磁性金属成分を含む金属粉を凝結して製造されることを特徴とするフレッシュコンクリート流動性改善用磁性体である。
本発明の第七の構成は，前記金属粉が，鉄（Fe），銅（Cu），アルミニウム（Al），ニッケル（Ni），コバルト（Co），ホウ素（B），これら金属成分（これら金属元素を構成元素として含む金属成分を含む）のいずれか又は二種以上を組み合わせてなる第六の構成に記載のフレッシュコンクリート流動性改善用磁性体である。 A sixth structure of the present invention is the magnetic body according to any one of the first to fifth structures, which is produced by coagulating metal powder containing a magnetic metal component, and is characterized by the fact that it is a fluid of fresh concrete It is a magnetic substance for improvement.
According to a seventh aspect of the present invention, the metal powder comprises iron (Fe), copper (Cu), aluminum (Al), nickel (Ni), cobalt (Co), boron (B), these metal components (these metals It is a magnetic body for the fluidity | liquidity improvement of the fresh concrete as described in the 6th structure which combines any or 2 types or more of the metal component which contains an element as a constitutent element.
本発明の第七の構成は，前記金属粉が，鉄（Fe），銅（Cu），アルミニウム（Al），ニッケル（Ni），コバルト（Co），ホウ素（B），これら金属成分（これら金属元素を構成元素として含む金属成分を含む）のいずれか又は二種以上を組み合わせてなる第六の構成に記載のフレッシュコンクリート流動性改善用磁性体である。 A sixth structure of the present invention is the magnetic body according to any one of the first to fifth structures, which is produced by coagulating metal powder containing a magnetic metal component, and is characterized by the fact that it is a fluid of fresh concrete It is a magnetic substance for improvement.
According to a seventh aspect of the present invention, the metal powder comprises iron (Fe), copper (Cu), aluminum (Al), nickel (Ni), cobalt (Co), boron (B), these metal components (these metals It is a magnetic body for the fluidity | liquidity improvement of the fresh concrete as described in the 6th structure which combines any or 2 types or more of the metal component which contains an element as a constitutent element.
本発明により，生コン組成に影響を及ぼさず，生コンが凝結するまでの時間を遅延させる方法の提供が可能となった。
すなわち，本発明のフレッシュコンクリートの使用方法によれば，フレッシュコンクリートの近傍に所定の固形体（磁性体）を静置するのみで，フレッシュコンクリートが凝結するまでの時間を遅延させることができるとともに，硬化後のコンクリートの形成能を向上させることが可能となる。 According to the present invention, it has become possible to provide a method for delaying the time until the raw concrete condenses without affecting the raw concrete composition.
That is, according to the method of using the fresh concrete of the present invention, it is possible to delay the time until the fresh concrete condenses by only allowing a predetermined solid body (magnetic body) to stand in the vicinity of the fresh concrete, It becomes possible to improve the formation ability of the concrete after hardening.
すなわち，本発明のフレッシュコンクリートの使用方法によれば，フレッシュコンクリートの近傍に所定の固形体（磁性体）を静置するのみで，フレッシュコンクリートが凝結するまでの時間を遅延させることができるとともに，硬化後のコンクリートの形成能を向上させることが可能となる。 According to the present invention, it has become possible to provide a method for delaying the time until the raw concrete condenses without affecting the raw concrete composition.
That is, according to the method of using the fresh concrete of the present invention, it is possible to delay the time until the fresh concrete condenses by only allowing a predetermined solid body (magnetic body) to stand in the vicinity of the fresh concrete, It becomes possible to improve the formation ability of the concrete after hardening.
本発明のフレッシュコンクリートの使用方法は，フレッシュコンクリート近傍に建設用磁性体（固形体，ENE）を静置することにより，フレッシュコンクリートの流動性を向上させるとともに凝結を遅延させることを特徴とする。また，本発明のフレッシュコンクリートの使用方法においては，さらに，硬化後のコンクリートの形成能を向上させるものとして用いることができる。
The method of using the fresh concrete according to the present invention is characterized in that the fluidity of the fresh concrete is improved and the setting is delayed by leaving the magnetic material for construction (solid body, ENE) in the vicinity of the fresh concrete. Moreover, in the usage method of the fresh concrete of this invention, it can further be used as what improves the formation ability of the concrete after hardening.
本発明のフレッシュコンクリート使用方法は，建設資材として通常用いられるフレッシュコンクリートにおいて適用すればよい。
すなわち，セメント，水，細骨材，粗骨材，混和剤，これらを構成成分とするフレッシュコンクリートにおいて用いればよい。しかるに，その他の成分の含有を完全に排除するものではなく，磁性体静置における凝結遅延ないし形成能向上という本発明の趣旨に沿う限り，凝結剤など他の構成成分を含んでも構わない。 The method of using fresh concrete according to the present invention may be applied to fresh concrete that is usually used as a construction material.
That is, it may be used in cement, water, fine aggregate, coarse aggregate, admixture, and fresh concrete containing these as components. However, other components such as a coagulant may be included as long as the content of the other components is not completely eliminated and the present invention aims to improve the setting delay or formation ability when the magnetic substance is left.
すなわち，セメント，水，細骨材，粗骨材，混和剤，これらを構成成分とするフレッシュコンクリートにおいて用いればよい。しかるに，その他の成分の含有を完全に排除するものではなく，磁性体静置における凝結遅延ないし形成能向上という本発明の趣旨に沿う限り，凝結剤など他の構成成分を含んでも構わない。 The method of using fresh concrete according to the present invention may be applied to fresh concrete that is usually used as a construction material.
That is, it may be used in cement, water, fine aggregate, coarse aggregate, admixture, and fresh concrete containing these as components. However, other components such as a coagulant may be included as long as the content of the other components is not completely eliminated and the present invention aims to improve the setting delay or formation ability when the magnetic substance is left.
本発明で用いる磁性体は，磁性体としての通常の性能を有するものを用いればよく，製品として例えば，固形体ENE（エナ）を用いればよい。本発明において，この磁性体静置により，凝結遅延ないし形成能向上の効果を発揮するかは完全に明らかとなっているものではないが，一つの可能性として，磁性体により発せられる何らかの波長成分により，フレッシュコンクリート中の空気が抜ける，ないしは粒子成分がより混和し細かくなるなどで，本発明の効果が得られるものと推察される。
本発明で用いる磁性体は，磁性体として作用する金属粉を，熱を与えるなどして凝結させることにより製造される。かかる金属粉としては，例えば，鉄（Fe），銅（Cu），アルミニウム（Al），ニッケル（Ni），コバルト（Co），ホウ素（B），これら金属成分（これら金属元素を構成元素として含む金属成分を含む）のいずれか又は二種以上を組み合わせて製造される。 The magnetic substance used in the present invention may be one having a normal performance as a magnetic substance, and for example, a solid ENE (ena) may be used as a product. In the present invention, it is not completely clear whether the effect of setting delay or formation ability is to be exhibited by this magnetic material standing still, but one possible possibility is that some wavelength component emitted by the magnetic material Thus, it is presumed that the effects of the present invention can be obtained because the air in the fresh concrete escapes or the particle components become more miscible and finer.
The magnetic substance used in the present invention is produced by condensing metal powder acting as a magnetic substance by applying heat or the like. Such metal powder includes, for example, iron (Fe), copper (Cu), aluminum (Al), nickel (Ni), cobalt (Co), boron (B), and these metal components (these metal elements are included as constituent elements) Or a combination of two or more thereof.
本発明で用いる磁性体は，磁性体として作用する金属粉を，熱を与えるなどして凝結させることにより製造される。かかる金属粉としては，例えば，鉄（Fe），銅（Cu），アルミニウム（Al），ニッケル（Ni），コバルト（Co），ホウ素（B），これら金属成分（これら金属元素を構成元素として含む金属成分を含む）のいずれか又は二種以上を組み合わせて製造される。 The magnetic substance used in the present invention may be one having a normal performance as a magnetic substance, and for example, a solid ENE (ena) may be used as a product. In the present invention, it is not completely clear whether the effect of setting delay or formation ability is to be exhibited by this magnetic material standing still, but one possible possibility is that some wavelength component emitted by the magnetic material Thus, it is presumed that the effects of the present invention can be obtained because the air in the fresh concrete escapes or the particle components become more miscible and finer.
The magnetic substance used in the present invention is produced by condensing metal powder acting as a magnetic substance by applying heat or the like. Such metal powder includes, for example, iron (Fe), copper (Cu), aluminum (Al), nickel (Ni), cobalt (Co), boron (B), and these metal components (these metal elements are included as constituent elements) Or a combination of two or more thereof.
フレッシュコンクリート近傍に磁性体を静置する方法については，これが可能である限り特に限定する必要はなく，種々の手法により行うことができる。
本発明において近傍とは，フレッシュコンクリートに直接は接していないものの，可能な限り近い距離として定義される。すなわち，フレッシュコンクリートが圧送されている配管やホースなどの圧送管，生コンポンプ車のポンプ，生コン車のドラム，運搬用一輪車の荷台，これらの物理的媒体の数cmから数十cm内の距離に磁性体を吊るしたり，貼付するなどして静置すればよい。また，セメント粉に適用する場合も，同様に，セメント粉の近傍に磁性体を静置すればよい。 It is not necessary to specifically limit the method of leaving the magnetic body in the vicinity of the fresh concrete as far as this is possible, and various methods can be used.
In the present invention, the vicinity is defined as a distance as close as possible although not in direct contact with fresh concrete. That is, pumping pipes such as piping and hoses to which fresh concrete is pumped, pumps of fresh concrete pump cars, drums of fresh concrete cars, loading beds of transportation unicycles, and distances of several centimeters to tens of centimeters of these physical media. The magnetic body may be suspended or attached and left to stand. Also, in the case of applying to cement powder, similarly, the magnetic material may be left in the vicinity of the cement powder.
本発明において近傍とは，フレッシュコンクリートに直接は接していないものの，可能な限り近い距離として定義される。すなわち，フレッシュコンクリートが圧送されている配管やホースなどの圧送管，生コンポンプ車のポンプ，生コン車のドラム，運搬用一輪車の荷台，これらの物理的媒体の数cmから数十cm内の距離に磁性体を吊るしたり，貼付するなどして静置すればよい。また，セメント粉に適用する場合も，同様に，セメント粉の近傍に磁性体を静置すればよい。 It is not necessary to specifically limit the method of leaving the magnetic body in the vicinity of the fresh concrete as far as this is possible, and various methods can be used.
In the present invention, the vicinity is defined as a distance as close as possible although not in direct contact with fresh concrete. That is, pumping pipes such as piping and hoses to which fresh concrete is pumped, pumps of fresh concrete pump cars, drums of fresh concrete cars, loading beds of transportation unicycles, and distances of several centimeters to tens of centimeters of these physical media. The magnetic body may be suspended or attached and left to stand. Also, in the case of applying to cement powder, similarly, the magnetic material may be left in the vicinity of the cement powder.
本発明においては，製造工程，運搬工程，使用工程，これらいずれの工程においても，作業上の障害とならない態様で，フレッシュコンクリート近傍に磁性体を静置すればよい。
この場合の具体的な態様として，例えば，フレッシュコンクリートの圧送管，アジテータ車（生コン車），生コンポンプ車，運搬用一輪車，これらの近傍に静置すればよい。
静置の手法としては，圧送管などの外部ないし外枠に，図１に例示されるように球形状の磁性体を吊るして静置したり，テープなどで貼付して静置したりするなどすればよい。 In the present invention, the magnetic material may be left in the vicinity of the fresh concrete in such a manner as not to be an obstacle for operation in any of the manufacturing process, the transporting process, and the using process.
As a specific mode in this case, for example, it may be placed in a delivery pipe of fresh concrete, an agitator car (raw concrete car), a fresh concrete pump car, a transportation unicycle, or the like in the vicinity thereof.
As a method of settling, as shown in FIG. 1, a ball-shaped magnetic body is suspended and left standing on the outside or outer frame of a pressure-feeding tube etc., or pasted by tape etc, etc. do it.
この場合の具体的な態様として，例えば，フレッシュコンクリートの圧送管，アジテータ車（生コン車），生コンポンプ車，運搬用一輪車，これらの近傍に静置すればよい。
静置の手法としては，圧送管などの外部ないし外枠に，図１に例示されるように球形状の磁性体を吊るして静置したり，テープなどで貼付して静置したりするなどすればよい。 In the present invention, the magnetic material may be left in the vicinity of the fresh concrete in such a manner as not to be an obstacle for operation in any of the manufacturing process, the transporting process, and the using process.
As a specific mode in this case, for example, it may be placed in a delivery pipe of fresh concrete, an agitator car (raw concrete car), a fresh concrete pump car, a transportation unicycle, or the like in the vicinity thereof.
As a method of settling, as shown in FIG. 1, a ball-shaped magnetic body is suspended and left standing on the outside or outer frame of a pressure-feeding tube etc., or pasted by tape etc, etc. do it.
本発明において静置する磁性体について，これによる凝結遅延ないし形成能向上効果が得られる限り特に限定する必要はなく，種々の態様で静置することができる。
静置する磁性体の数について，磁性体による影響が効果的に伝わることを想定して静置すればよく，典型的には，圧送管において１か所から複数個所，生コン車において１か所から複数個所，運搬用一輪車において1か所から2か所以上，磁性体を静置するなどすればよい。
静置する磁性体の大きさないし形状についても同様に静置すればよく，典型的には，球状ないし楕円球状の磁性体であって，直径が数cmから数十cmのものを用いればよい。 It is not necessary to specifically limit the magnetic material to be left standing in the present invention as long as the setting delay effect or formation ability improvement effect can be obtained thereby, and it can be left in various modes.
With regard to the number of magnetic bodies to be left still, it may be left on the assumption that the influence of the magnetic substance can be effectively transmitted. The magnetic material may be allowed to stand at a plurality of locations, one to two or more locations on the transportation unicycle.
Similarly, the size or shape of the magnetic body to be set may be set as well, and typically, a spherical or elliptic spherical magnetic body having a diameter of several cm to several tens cm may be used. .
静置する磁性体の数について，磁性体による影響が効果的に伝わることを想定して静置すればよく，典型的には，圧送管において１か所から複数個所，生コン車において１か所から複数個所，運搬用一輪車において1か所から2か所以上，磁性体を静置するなどすればよい。
静置する磁性体の大きさないし形状についても同様に静置すればよく，典型的には，球状ないし楕円球状の磁性体であって，直径が数cmから数十cmのものを用いればよい。 It is not necessary to specifically limit the magnetic material to be left standing in the present invention as long as the setting delay effect or formation ability improvement effect can be obtained thereby, and it can be left in various modes.
With regard to the number of magnetic bodies to be left still, it may be left on the assumption that the influence of the magnetic substance can be effectively transmitted. The magnetic material may be allowed to stand at a plurality of locations, one to two or more locations on the transportation unicycle.
Similarly, the size or shape of the magnetic body to be set may be set as well, and typically, a spherical or elliptic spherical magnetic body having a diameter of several cm to several tens cm may be used. .
＜＜実験例１，磁性体静置型フレッシュコンクリートの性能検討＞＞
１．運搬用一輪車内において，各種素材を混ぜ合わせフレッシュコンクリートの製造を行った（図１）。この際，一方には，一輪車側面に球状の磁性体（固形体ENEエナ）を吊るすことにより静置して製造を行い（実施例），もう一方では，磁性体を吊るすことなく製造を行った（比較例）。 << Experimental example 1, Performance examination of magnetic material stationary type fresh concrete >>
1. In the transportation unicycle, various materials were mixed to produce fresh concrete (Fig. 1). At this time, one side was suspended by suspending a spherical magnetic body (solid body ENE ena) on the side of a unicycle (Example), and the other side was manufactured without suspending the magnetic body (Comparative example).
１．運搬用一輪車内において，各種素材を混ぜ合わせフレッシュコンクリートの製造を行った（図１）。この際，一方には，一輪車側面に球状の磁性体（固形体ENEエナ）を吊るすことにより静置して製造を行い（実施例），もう一方では，磁性体を吊るすことなく製造を行った（比較例）。 << Experimental example 1, Performance examination of magnetic material stationary type fresh concrete >>
1. In the transportation unicycle, various materials were mixed to produce fresh concrete (Fig. 1). At this time, one side was suspended by suspending a spherical magnetic body (solid body ENE ena) on the side of a unicycle (Example), and the other side was manufactured without suspending the magnetic body (Comparative example).
２．フレッシュコンクリート製造から３０分ほど静置し，その後，それぞれのフレッシュコンクリートをスランプコーンに入れた（図２）。
３．スランプコーンに入れてから直後にスランプコーンを抜いた状態を図３，図４に示す。図３は比較例の様子を，図４は実施例の様子を示した図である。
(1) 比較例においては，フレッシュコンクリートの形成が不十分であり，そのため，全体的に広がりを見せていた。
(2) 実施例においては，フレッシュコンクリートの形成が比較例よりも進んでおり，そのため，全体的な広がりも少なくかった。
(3) さらに製造から0分後，30分後のスランプ値を比較した結果を表１に示す。これより，実施例の方が比較例よりもスランプ値が高い結果であった。
４．この結果から，実施例においては，形成能が優れることが分かった。 2. After standing for about 30 minutes from the production of fresh concrete, each fresh concrete was placed in a slump cone (Fig. 2).
3. The state in which the slump cone is removed immediately after being put in the slump cone is shown in FIG. 3 and FIG. FIG. 3 shows the appearance of the comparative example, and FIG. 4 shows the appearance of the embodiment.
(1) In the comparative example, the formation of fresh concrete was insufficient, and therefore, the spread was shown as a whole.
(2) In the example, the formation of fresh concrete was more advanced than the comparative example, so the overall spread was less.
(3) Table 1 shows the results of comparing the slump values 0 and 30 minutes after production. From this, it is the result that the slump value is higher in the example than in the comparative example.
4. From this result, it was found that the formation ability is excellent in the examples.
３．スランプコーンに入れてから直後にスランプコーンを抜いた状態を図３，図４に示す。図３は比較例の様子を，図４は実施例の様子を示した図である。
(1) 比較例においては，フレッシュコンクリートの形成が不十分であり，そのため，全体的に広がりを見せていた。
(2) 実施例においては，フレッシュコンクリートの形成が比較例よりも進んでおり，そのため，全体的な広がりも少なくかった。
(3) さらに製造から0分後，30分後のスランプ値を比較した結果を表１に示す。これより，実施例の方が比較例よりもスランプ値が高い結果であった。
４．この結果から，実施例においては，形成能が優れることが分かった。 2. After standing for about 30 minutes from the production of fresh concrete, each fresh concrete was placed in a slump cone (Fig. 2).
3. The state in which the slump cone is removed immediately after being put in the slump cone is shown in FIG. 3 and FIG. FIG. 3 shows the appearance of the comparative example, and FIG. 4 shows the appearance of the embodiment.
(1) In the comparative example, the formation of fresh concrete was insufficient, and therefore, the spread was shown as a whole.
(2) In the example, the formation of fresh concrete was more advanced than the comparative example, so the overall spread was less.
(3) Table 1 shows the results of comparing the slump values 0 and 30 minutes after production. From this, it is the result that the slump value is higher in the example than in the comparative example.
4. From this result, it was found that the formation ability is excellent in the examples.
５．また，実施例と比較例の外観を見ると，実施例の方がきめ細かい外観であり，比較例の方が比較的粗い見た目の外観であった。また，凝結までの時間も実施例の方が遅れて硬化していく様子が確認された。
5. In addition, looking at the appearance of the example and the comparative example, the appearance of the example was finer and the appearance of the comparative example was relatively rough. In addition, it was also confirmed that the curing time was delayed in the example.
６．さらに製造してから7日後，28日後，それぞれのコンクリート強度の比較試験の結果を表２，表３に示す。表２が比較例，表３が実施例，それぞれのコンクリート強度の結果を示したものである。
(1) 製造7日後において，比較例における平均値が22.2 N/m2，実施例における平均値が21.1 N/m2であった。
(2) 製造28日後において，比較例における平均値が32.0 N/m2，実施例における平均値が31.3 N/m2であった。
(3) いずれにおいても比較例の方が値は高かったものの有意な差はなく，実施例においても，標準的な強度（配合予備強度24.0N/m2）を十分に備えるものであった。 6. Further, 7 and 28 days after production, the results of comparative tests of the respective concrete strengths are shown in Tables 2 and 3. Table 2 shows the comparative example, and Table 3 shows the result of the concrete strength of each example.
(1) Seven days after production, the average value in the comparative example was 22.2 N / m 2 , and the average value in the example was 21.1 N / m 2 .
(2) 28 days after manufacture, the average value in the comparative example was 32.0 N / m 2 , and the average value in the example was 31.3 N / m 2 .
(3) In all cases, although the value was higher in the comparative example, there was no significant difference in the examples, and the examples were sufficiently provided with the standard strength (blending preliminary strength 24.0 N / m 2 ).
(1) 製造7日後において，比較例における平均値が22.2 N/m2，実施例における平均値が21.1 N/m2であった。
(2) 製造28日後において，比較例における平均値が32.0 N/m2，実施例における平均値が31.3 N/m2であった。
(3) いずれにおいても比較例の方が値は高かったものの有意な差はなく，実施例においても，標準的な強度（配合予備強度24.0N/m2）を十分に備えるものであった。 6. Further, 7 and 28 days after production, the results of comparative tests of the respective concrete strengths are shown in Tables 2 and 3. Table 2 shows the comparative example, and Table 3 shows the result of the concrete strength of each example.
(1) Seven days after production, the average value in the comparative example was 22.2 N / m 2 , and the average value in the example was 21.1 N / m 2 .
(2) 28 days after manufacture, the average value in the comparative example was 32.0 N / m 2 , and the average value in the example was 31.3 N / m 2 .
(3) In all cases, although the value was higher in the comparative example, there was no significant difference in the examples, and the examples were sufficiently provided with the standard strength (blending preliminary strength 24.0 N / m 2 ).
＜＜実験例２，磁性体静置型フレッシュコンクリートの性能検討＞＞
１．実験例１と同様の手法で，検討を行った結果を図５に示す。図５は，左が比較例，右が実施例である。
２．図のとおり，実施例と比較して，比較例は，明らかにフレッシュコンクリートが広がっており，高さも低いものであった。
３．この結果からも，磁性体を用いることにより，コンクリートとしての形成能が優れていることが確認された。 << Experimental example 2, performance examination of magnetic material stationary type fresh concrete >>
1. The results of the study conducted in the same manner as in Experimental Example 1 are shown in FIG. In FIG. 5, the left is a comparative example and the right is an example.
2. As shown in the figure, as compared with the example, in the comparative example, the fresh concrete was clearly spread and the height was low.
3. Also from this result, it was confirmed that the formation ability as concrete is excellent by using a magnetic material.
１．実験例１と同様の手法で，検討を行った結果を図５に示す。図５は，左が比較例，右が実施例である。
２．図のとおり，実施例と比較して，比較例は，明らかにフレッシュコンクリートが広がっており，高さも低いものであった。
３．この結果からも，磁性体を用いることにより，コンクリートとしての形成能が優れていることが確認された。 << Experimental example 2, performance examination of magnetic material stationary type fresh concrete >>
1. The results of the study conducted in the same manner as in Experimental Example 1 are shown in FIG. In FIG. 5, the left is a comparative example and the right is an example.
2. As shown in the figure, as compared with the example, in the comparative example, the fresh concrete was clearly spread and the height was low.
3. Also from this result, it was confirmed that the formation ability as concrete is excellent by using a magnetic material.
＜＜実験例３，磁性体静置型フレッシュコンクリートの拡大顕微鏡図＞＞
１．実験例１と同様の手法でフレッシュコンクリートを取り扱い，凝結途中のものについて，顕微鏡で確認を行った。
２．確認を行ったところ，気泡が確認されず，全体的にきめ細かな状態となっていた（不図示）。
３．このことから磁性体静置型フレッシュコンクリートでは，その状態が好ましい状態となっていることが確認された。
<< Experimental Example 3, Magnified Microscopic View of Magnetic Free Standing Fresh Concrete >>
1. Fresh concrete was handled in the same manner as in Experiment Example 1, and the concrete on the way of setting was confirmed with a microscope.
2. As a result of confirmation, air bubbles were not confirmed and it was in a fine-grained state as a whole (not shown).
3. From this, it was confirmed that in the magnetic material static type fresh concrete, that state is in a preferable state.
１．実験例１と同様の手法でフレッシュコンクリートを取り扱い，凝結途中のものについて，顕微鏡で確認を行った。
２．確認を行ったところ，気泡が確認されず，全体的にきめ細かな状態となっていた（不図示）。
３．このことから磁性体静置型フレッシュコンクリートでは，その状態が好ましい状態となっていることが確認された。
<< Experimental Example 3, Magnified Microscopic View of Magnetic Free Standing Fresh Concrete >>
1. Fresh concrete was handled in the same manner as in Experiment Example 1, and the concrete on the way of setting was confirmed with a microscope.
2. As a result of confirmation, air bubbles were not confirmed and it was in a fine-grained state as a whole (not shown).
3. From this, it was confirmed that in the magnetic material static type fresh concrete, that state is in a preferable state.
Claims (7)
- フレッシュコンクリート近傍に磁性体を静置することにより，フレッシュコンクリートの流動性を向上させるとともに凝結を遅延させることを特徴とするフレッシュコンクリート流動性改善方法
A method for improving fluidity of fresh concrete characterized in that the fluidity of fresh concrete is improved and the setting is delayed by leaving a magnetic body in the vicinity of fresh concrete. - さらに，凝結後のコンクリートの形成能を向上させる請求項１に記載のフレッシュコンクリート流動性改善方法
Furthermore, the method of improving fluidity of fresh concrete according to claim 1, wherein the ability to form concrete after setting is improved. - フレッシュコンクリート近傍が，フレッシュコンクリートの圧送管，生コンポンプ車，アジテータ車，運搬用一輪車のいずれか複数の近傍である請求項１又は２に記載のフレッシュコンクリート流動性改善方法
The method for improving fluidity of fresh concrete according to claim 1 or 2, wherein the vicinity of the fresh concrete is any one of a plurality of pumps for fresh concrete, a pump pipe for fresh concrete, a pump pump car, an agitator car, and a transport unicycle. - セメント粉の近傍に磁性体を静置することにより，セメント粉の劣化を防止および流動性を改善することを特徴とするセメント粉劣化防止方法
A method for preventing deterioration of cement powder characterized by preventing deterioration of cement powder and improving fluidity by placing a magnetic body in the vicinity of cement powder. - 請求項４に記載のセメント粉を用いて製造することにより，フレッシュコンクリート
の流動性を改善させたことを特徴とするフレッシュコンクリート流動性改善方法
A method of improving fluidity of fresh concrete characterized in that the fluidity of fresh concrete is improved by using cement powder according to claim 4. - 請求項１ないし５のいずれかに記載の方法に用いられる磁性体であって，磁性金属成分を含む金属粉を凝結して作製されることを特徴とするフレッシュコンクリート流動性改善用磁性体
A magnetic material for use in a method according to any one of claims 1 to 5, which is produced by coagulating metal powder containing a magnetic metal component, and is characterized in that it is a magnetic material for improving fluidity of a fresh concrete. - 前記金属粉が，鉄（Fe），銅（Cu），アルミニウム（Al），ニッケル（Ni），コバルト（Co），ホウ素（B），これら金属成分（これら金属元素を構成元素として含む金属成分を含む）のいずれか又は二種以上を組み合わせてなる請求項６に記載のフレッシュコンクリート流動性改善用磁性体
The metal powder comprises iron (Fe), copper (Cu), aluminum (Al), nickel (Ni), cobalt (Co), boron (B), and metal components containing these metal elements (these metal elements as constituent elements) The magnetic material for improving fluidity of fresh concrete according to claim 6, wherein any one or two or more of them are combined.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017159495A (en) * | 2016-03-08 | 2017-09-14 | 住友大阪セメント株式会社 | Method for forming cured body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145067A (en) * | 1981-02-27 | 1982-09-07 | Tsumoru Taniguchi | Manufacture of high bending stress concrete |
| JPS60235755A (en) * | 1984-05-09 | 1985-11-22 | 三井建設株式会社 | Aggregate for spray concrete mortar |
| JPH10258406A (en) * | 1997-03-19 | 1998-09-29 | Satoru Fukai | Concrete having property changeable by magnetism |
-
2018
- 2018-10-31 WO PCT/JP2018/040447 patent/WO2019088150A1/en active Application Filing
- 2018-10-31 JP JP2019550442A patent/JP7284921B2/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145067A (en) * | 1981-02-27 | 1982-09-07 | Tsumoru Taniguchi | Manufacture of high bending stress concrete |
| JPS60235755A (en) * | 1984-05-09 | 1985-11-22 | 三井建設株式会社 | Aggregate for spray concrete mortar |
| JPH10258406A (en) * | 1997-03-19 | 1998-09-29 | Satoru Fukai | Concrete having property changeable by magnetism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017159495A (en) * | 2016-03-08 | 2017-09-14 | 住友大阪セメント株式会社 | Method for forming cured body |
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| JP7284921B2 (en) | 2023-06-01 |
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