JP2007270503A - Concrete structure construction method - Google Patents

Concrete structure construction method Download PDF

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JP2007270503A
JP2007270503A JP2006097008A JP2006097008A JP2007270503A JP 2007270503 A JP2007270503 A JP 2007270503A JP 2006097008 A JP2006097008 A JP 2006097008A JP 2006097008 A JP2006097008 A JP 2006097008A JP 2007270503 A JP2007270503 A JP 2007270503A
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concrete
concrete structure
repellent material
water repellent
paint
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JP5005244B2 (en
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Hajime Shibuya
一 渋谷
Naoki Chiba
尚樹 千葉
Teru Akiyama
暉 秋山
Atsushi Maeyama
篤史 前山
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KAJIMA RENOVATE KK
Fujikura Kasei Co Ltd
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KAJIMA RENOVATE KK
Fujikura Kasei Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a concrete structure construction method for constructing or repairing a concrete structure, according to which concrete can be placed onto a portion of the concrete structure coated with a water repellent agent with sufficient adhesion strength, to thereby exert excellent water infiltration preventive effect. <P>SOLUTION: The concrete structure construction method has a placing step of placing the concrete onto the concrete structure. According to the method, before carrying out the placing step, a water repellent agent applying step of applying the water repellent agent to the concrete structure, and a coating material applying step of applying a coating material inclusive of a pigment to an area where the water repellent agent has been applied, are carried out. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、橋などのコンクリート類構造体を建設したり、補修したりする構築方法に関する。   The present invention relates to a construction method for constructing or repairing a concrete structure such as a bridge.

モルタル、コンクリートなどのコンクリート類からなるコンクリート類構造体(以下、単に構造体という場合もある。)のうち、橋、ダムなどの大きな構造体を建設する場合などには、コンクリート類を一度に打設することは困難であるため、複数回に分けて打設する方法が一般に採用されている。具体的には、まず、構造体の設置箇所の一部分に型枠を設置し、この枠内にコンクリート類を注入して乾燥(養生)する。ついで、このコンクリート類が乾燥してから、再び型枠内にコンクリート類を注入、乾燥する。このような方法を繰り返し、コンクリート類を打ち継ぐことにより、大きな構造体を建設している。   Among concrete structures made of concrete such as mortar and concrete (hereinafter sometimes simply referred to as structures), when constructing large structures such as bridges and dams, concrete is cast at once. Since it is difficult to install, a method of placing in multiple times is generally adopted. Specifically, first, a mold is installed at a part of the installation location of the structure, and concrete is poured into the frame and dried (cured). Next, after the concrete is dried, the concrete is again poured into the mold and dried. A large structure is constructed by repeating such a method and succeeding concrete.

一方、コンクリート類構造体は、経時的に亀裂、剥離、爆裂などの劣化が認められる場合が多いために、これを補修することも一般に行われている。このような劣化は、外部からの水の浸入により、構造体内の鉄筋が腐食、膨張し、コンクリート類に内側から応力が加わることが主な原因であると考えられている。このような劣化が認められると、その劣化部分から構造体内にさらに水が浸入し、より一層鉄筋の腐食が進行する。そして最終的には、コンクリート類と鉄筋との界面が剥離して、コンクリート類が部分的に脱落してしまうこともある。コンクリート類構造体の劣化しやすさは、コンクリート類の組成により異なり、また、コンクリート類の塩分量が多い場合や、かぶり厚みが薄い場合などには、劣化しやすいと言われている。
コンクリート類構造体にこのような劣化が認められた際、劣化が小さな亀裂程度であれば、亀裂部分をコンクリート類やエポキシ樹脂などの樹脂類で補修する方法がとられるが、劣化が著しい場合には、その劣化部分をはつり取るなどして取り除き、これにより露出した露出部に対してコンクリート類を打設して、埋め戻す方法が採用されている(例えば特許文献1の従来技術参照)。
特開2003−120041号公報
On the other hand, since concrete structures are often deteriorated over time, such as cracks, delamination, and explosions, they are generally repaired. Such deterioration is considered to be mainly caused by the invasion of water from the outside, the reinforcing bars in the structure corrode and expand, and stress is applied to the concrete from the inside. When such deterioration is recognized, water further infiltrates into the structure from the deteriorated portion, and corrosion of the reinforcing bar further proceeds. Eventually, the interface between the concrete and the reinforcing bars peels off, and the concrete may fall off partially. The ease of deterioration of concrete structures depends on the composition of the concrete, and is said to be easily deteriorated when the salt content of the concrete is large or the cover thickness is thin.
When such deterioration is observed in concrete structures, if the deterioration is small enough to be cracked, a method of repairing the cracked part with concrete or epoxy resin is taken. A method has been adopted in which the deteriorated portion is removed, for example, by scraping, and a concrete is placed on the exposed portion exposed thereby to backfill (see, for example, the prior art in Patent Document 1).
JP 2003-120041 A

ところが、上述したように大きな構造体を建設するに際して、コンクリート類を打ち継いだ場合や、補修のために対象部分にコンクリート類を新たに打設した場合には、打ち継ぎ部や新たに打設した部分から水が構造体内に浸入しやすく、そのため、鉄筋の腐食や、さらにはコンクリート類の亀裂、剥離、爆裂が引き起こされやすいという問題があった。   However, when constructing a large structure as described above, if concrete is handed over, or if concrete is newly placed on the target part for repair, the joint or newly placed Water easily penetrates into the structure from the damaged part, and there is a problem that corrosion of the reinforcing bars and further cracking, peeling and explosion of the concrete are likely to occur.

そこで、本発明者らは、このような構造体内への水の浸入を防止するために、対象部分に撥水材を塗布してからコンクリート類を打設する方法を検討した。   Therefore, the present inventors examined a method of placing concrete after applying a water repellent material to the target portion in order to prevent water from entering the structure.

ところが、モルタル、コンクリートなどのコンクリート類は、打設時には水分を多く含んでいるため、撥水材とは親和しにくい。そのため、撥水材が塗布された部分に対してコンクリート類を十分な付着強度で打設することは、困難であった。   However, concrete such as mortar and concrete contains a large amount of moisture at the time of placing, and thus is hardly compatible with a water repellent material. For this reason, it has been difficult to place concrete with sufficient adhesion strength on the portion to which the water repellent material is applied.

本発明は上記事情に鑑みてなされたもので、コンクリート類構造体を建設したり、補修したりする構築方法において、撥水材が塗布された部分に対して十分な付着強度でコンクリート類を打設でき、水の浸入抑制効果に優れたコンクリート類構造体の構築方法の提供を課題とする。   The present invention has been made in view of the above circumstances, and in a construction method for constructing or repairing a concrete structure, the concrete is hit with sufficient adhesion strength to a portion to which a water repellent material is applied. It is an object of the present invention to provide a method for constructing a concrete structure that can be installed and has an excellent water invasion suppression effect.

本発明者らは鋭意検討した結果、撥水材を塗布した後、その上に顔料を含有する塗料を塗布すると、いわゆるアンカー効果が発現することにより、塗膜上にコンクリート類を十分な付着強度で打設できることを見出して、本発明を完成するに至った。
本発明のコンクリート類構造体の構築方法は、コンクリート類構造体にコンクリート類を打設する打設工程を有するコンクリート類構造体の構築方法であって、前記打設工程の前に、前記コンクリート類構造体に撥水材を塗布する撥水材塗布工程と、前記撥水材が塗布された部分に顔料を含む塗料を塗布する塗料塗布工程とを有することを特徴とする。
例えばコンクリート類構造体を補修するにあたっては、前記撥水材塗布工程の前に、前記コンクリート類構造体の一部を取り除く除去工程を有してもよく、前記撥水材塗布工程では、前記除去工程で露出した露出部に対して、前記撥水材を塗布する。
前記撥水材は、浸透性シラン系撥水材および/またはシロキサン系撥水材であることが好ましい。
前記塗料は、乾燥塗膜中の顔料の含有量が15〜70体積%であることが好ましい。
前記塗料の塗布量は50〜500g/mであることが好ましい。
前記塗料は、アクリル樹脂系エマルション塗料であることが好ましい。
As a result of intensive studies, the present inventors have applied a water-repellent material and then applied a paint containing a pigment thereon, so that a so-called anchor effect is exhibited, thereby providing concrete with sufficient adhesion strength on the coating film. As a result, the present invention was completed.
The method for constructing a concrete structure according to the present invention is a method for constructing a concrete structure having a placing step of placing concrete on a concrete structure, and the concrete is provided before the placing step. It has a water repellent material application process for applying a water repellent material to a structure, and a paint application process for applying a paint containing a pigment to a portion where the water repellent material is applied.
For example, when repairing a concrete structure, it may have a removal step of removing a part of the concrete structure before the water repellent material application step. In the water repellent material application step, the removal The said water repellent material is apply | coated with respect to the exposed part exposed at the process.
The water repellent material is preferably a permeable silane water repellent material and / or a siloxane water repellent material.
The paint preferably has a pigment content in the dry coating film of 15 to 70% by volume.
The coating amount of the paint is preferably 50 to 500 g / m 2 .
The paint is preferably an acrylic resin emulsion paint.

本発明によれば、コンクリート類構造体を建設したり、補修したりする構築方法において、撥水材が塗布された部分に対して十分な付着強度でコンクリート類を打設でき、水の浸入抑制効果に優れたコンクリート類構造体の構築方法を提供できる。   According to the present invention, in a construction method for constructing or repairing a concrete structure, concrete can be placed with sufficient adhesion strength to a portion to which a water repellent material is applied, and water intrusion is suppressed. It is possible to provide a method for constructing a concrete structure having an excellent effect.

本発明のコンクリート類構造体の構築方法は、新規な構造体を建設したり、既存の構造体を補修したりする際に適用できるものである。以下、本発明について、実施形態例を挙げて詳細に説明する。   The method for constructing a concrete structure of the present invention can be applied when constructing a new structure or repairing an existing structure. Hereinafter, the present invention will be described in detail with reference to exemplary embodiments.

[コンクリート類構造体の構築方法(1)]
本実施形態例のコンクリート類構造体を補修する場合の構築方法では、まず、既存のコンクリート類構造体の一部、具体的には亀裂、剥離、爆裂などの劣化が認められる部分や、劣化の可能性のある部分などの補修対象部分を取り除く(除去工程)。ここで除去工程の具体的な方法には制限はなく、補修対象部分を砕きながらはつり取る方法などで実施すればよい。
[Concrete structure construction method (1)]
In the construction method for repairing a concrete structure of the present embodiment example, first, a part of the existing concrete structure, specifically, a part where deterioration such as crack, delamination, and explosion is recognized, or Remove parts to be repaired such as possible parts (removal process). There is no restriction | limiting in the specific method of a removal process here, What is necessary is just to implement by the method of removing while crushing the repair object part.

なお、本発明において「コンクリート類」とは、モルタル、コンクリート、モルタルやコンクリートにポリマーエマルションをブレンドしたポリマーセメントなど、無機質のセメント(ポルトランドセメントなどの水硬性セメント;高炉セメントなどの潜在水硬性セメント;シリカセメントなどの混合セメント;石灰などの気硬性セメントなど)を含有する建築物材料のことを指し、これらのうち1種以上から形成される構造体であれば、いかなるものでも構築対象となるが、本発明は、橋桁など各種建築物の構造材料として広く使用されているコンクリート構造体の構築に特に好適である。   In the present invention, “concrete” refers to inorganic cement (hydraulic cement such as Portland cement; latent hydraulic cement such as blast furnace cement; This refers to building materials containing mixed cements such as silica cements; air-hardening cements such as lime), and any structure that is formed from one or more of these can be constructed. The present invention is particularly suitable for the construction of concrete structures widely used as structural materials for various buildings such as bridge girders.

除去工程の後には、露出した鉄筋があれば必要に応じて錆止め処理を行い、ついで、構造体の一部が取り除かれることで露出した露出部に対して、撥水材を塗布する(撥水材塗布工程)。
ここで使用される撥水材としては、撥水機能が強く、コンクリート類への浸透性が優れていることから、浸透性シラン系撥水材および/またはシロキサン系撥水材が好適である。
撥水材の塗布方法としては、ハケ塗り法、ローラー法、スプレー法などが挙げられ、塗布量としては、50〜700g/mが好ましい。また、塗布後には、例えば常温で24時間程度放置するなどして、撥水材を乾燥させる。
After the removal process, if there are exposed reinforcing bars, perform rust prevention treatment if necessary, and then apply a water-repellent material to the exposed parts exposed by removing part of the structure (water-repellent) Material application process).
As the water repellent material used here, a permeable silane-based water repellent material and / or a siloxane-based water repellent material is preferable because of its strong water repellent function and excellent permeability to concrete.
Examples of the method for applying the water repellent material include a brushing method, a roller method, and a spray method, and the application amount is preferably 50 to 700 g / m 2 . Further, after application, the water-repellent material is dried, for example, by leaving it at room temperature for about 24 hours.

撥水材塗布工程の後には、撥水材が塗布された露出部に顔料を含む塗料を塗布する(塗料塗布工程)。このように顔料を含む塗料を塗布して塗膜を形成すると、顔料の粒子により塗膜表面に細かい凹凸が形成される。その結果、アンカー効果が発現し、後述の打設工程においてコンクリート類を十分な付着強度で打設することができる。   After the water repellent material application step, a paint containing a pigment is applied to the exposed portion where the water repellent material is applied (paint application step). Thus, when the coating material containing a pigment is apply | coated and a coating film is formed, a fine unevenness | corrugation will be formed in the coating-film surface by the particle | grains of a pigment. As a result, an anchor effect is exhibited, and concrete can be placed with sufficient adhesion strength in the placing process described later.

塗料に含まれる顔料としては、例えば酸化チタン、炭酸カルシウム、硫酸バリウム、タルク、クレー、酸化ケイ素、酸化鉄、カーボン、樹脂ビーズなどが挙げられ、その好ましい平均粒子径は、良好なアンカー効果が得られる点で0.2〜200μmである。
塗料中の顔料の含有量は、塗料を乾燥させた乾燥塗膜中の含有量が10体積%以上となる量であれば、上述のアンカー効果が発現可能であるが、塗布作業性を考慮すると70体積%以下が好適であり、より好ましくは15〜70体積%、さらに好ましくは50〜70体積%である。
また、塗料は顔料を含有するものであれば特に制限なく使用できるが、バインダーとして樹脂成分を含む樹脂系エマルション塗料が好ましく、具体的には、アクリル樹脂系、アクリルシリコン樹脂系、エポキシ変性アクリル樹脂系などの樹脂成分を含むアクリル樹脂系エマルション塗料が好ましい。
Examples of the pigment contained in the paint include titanium oxide, calcium carbonate, barium sulfate, talc, clay, silicon oxide, iron oxide, carbon, resin beads and the like, and a preferable average particle size provides a good anchor effect. 0.2 to 200 μm.
As long as the content of the pigment in the paint is such that the content in the dry coating film obtained by drying the paint is 10% by volume or more, the above-described anchor effect can be exhibited. 70 volume% or less is suitable, More preferably, it is 15-70 volume%, More preferably, it is 50-70 volume%.
The paint can be used without particular limitation as long as it contains a pigment, but a resin-based emulsion paint containing a resin component as a binder is preferable, and specifically, an acrylic resin-based, acrylic silicon resin-based, epoxy-modified acrylic resin. An acrylic resin emulsion paint containing a resin component such as a resin is preferred.

塗料の塗布方法としては、ハケ塗り法、ローラー法、スプレー法などが挙げられ、塗布量としては、50〜500g/mが良好なアンカー効果が得られる点で好ましい。また、塗布後には、例えば常温で24時間程度放置するなどして、塗料の種類に応じた条件でこれを乾燥させる。 Examples of the coating method include a brush coating method, a roller method, and a spray method, and the coating amount is preferably 50 to 500 g / m 2 in that a good anchor effect can be obtained. Moreover, after application | coating, it is left to stand for about 24 hours, for example at normal temperature, and this is dried on the conditions according to the kind of coating material.

塗料塗布工程の後には、撥水材と塗料とが塗布された露出部に対して、コンクリート類を打設することにより、除去工程で除去された部分が埋め戻される(打設工程)。
ここで使用するコンクリート類としては、モルタル、コンクリート、モルタルやコンクリートにポリマーエマルション(混和用ポリマー)をブレンドしたポリマーセメントなど、無機質のセメント(ポルトランドセメントなどの水硬性セメント;高炉セメントなどの潜在水硬性セメント;シリカセメントなどの混合セメント;石灰などの気硬性セメントなど)を含有する建築物材料を使用できる。
打設の具体的な方法としては特に制限はないが、通常、露出部に型枠を設置し、この枠内にコンクリート類を注入して乾燥(養生)する方法が採られる。
After the paint application process, concrete is placed on the exposed portion where the water repellent material and the paint are applied, so that the portion removed in the removal process is backfilled (placement process).
Concrete used here is mortar, concrete, polymer cement blended with polymer emulsion (mixing polymer) in mortar and concrete, inorganic cement (hydraulic cement such as Portland cement; latent hydraulic such as blast furnace cement, etc. Building materials containing cement; mixed cement such as silica cement; air-hard cement such as lime) can be used.
Although there is no restriction | limiting in particular as a concrete method of placement, Usually, the method of installing a formwork in an exposed part and inject | pouring concrete into this frame and drying (curing) is taken.

以上説明したように、コンクリート類を打設する打設工程の前に、撥水材塗布工程と塗料塗布工程とを順次実施すると、コンクリート類は、撥水材上に直に打設されるのではなく、顔料を含む塗膜上に打設されることとなる。よって、除去工程により露出した露出部に撥水材を塗布した場合であっても、露出部に対して十分な付着強度でコンクリート類を打設でき、十分な水の浸入抑制効果を発揮することができる。
なお、この実施形態例では、コンクリート類構造体の一部を取り除く除去工程を行ってから、撥水材塗布工程と塗料塗布工程とを行う構築方法について説明したが、除去工程は必ずしも実施しなくてもよく、軽度の劣化である場合などには、除去工程を行わずに撥水材塗布工程と、塗料塗布工程と、打設工程とを順次行ってもよい。
As described above, when the water repellent material application step and the paint application step are sequentially performed before the placing step for placing concrete, the concrete is directly placed on the water repellent material. Instead, it is placed on the coating film containing the pigment. Therefore, even when a water-repellent material is applied to the exposed part exposed by the removal process, concrete can be placed with sufficient adhesion strength to the exposed part, and a sufficient water entry suppression effect can be exhibited. Can do.
In this embodiment, the construction method is described in which the removal step of removing a part of the concrete structure is performed, and then the water repellent material application step and the paint application step are performed. However, the removal step is not necessarily performed. Alternatively, in the case of slight deterioration, the water repellent material application process, the paint application process, and the placing process may be sequentially performed without performing the removal process.

[コンクリート類構造体の構築方法(2)]
上述の実施形態例では、既存のコンクリート類構造体を補修する場合の構築方法について説明したが、本発明は、例えば橋、ダムなどの大きな構造体などを新規に建設する際において、コンクリート類を一度に打設せずに複数回に分けて打設する方法を採用する場合にも、好ましく適用できる。
具体的には、まず、構造体の設置箇所の一部分に型枠を設置し、この枠内にコンクリート類を注入して乾燥(養生)する。
ついで、乾燥したコンクリート類構造体の表面の少なくとも一部に、撥水材を塗布する(撥水材塗布工程)。
そして、撥水材塗布工程の後に、撥水材が塗布された部分に顔料を含む塗料を塗布し(塗料塗布工程)、塗料が乾燥してから、この撥水材と塗料とが順次塗布された部分に再度コンクリート類を注入、乾燥して打設する(打設工程)。
このような方法によれば、コンクリート類を打ち継ぐ際、コンクリート類は、撥水材上に直に打設されるのではなく、顔料を含む塗膜上に打設されることとなる。よって、十分な付着強度でコンクリート類を打設でき、十分な水の浸入抑制効果を発揮することができる。なお、打設工程は、必要に応じて繰り返してもよく、その場合には、各打設工程に先だって、撥水材塗布工程と塗料塗布工程とを実施しておけばよい。
[Constructing method for concrete structures (2)]
In the above-described embodiment example, the construction method in the case of repairing an existing concrete structure has been described. However, the present invention is not limited to a concrete structure when a large structure such as a bridge or a dam is newly constructed. The present invention can also be preferably applied to a case where a method of placing a plurality of times without being placed at a time is adopted.
Specifically, first, a mold is installed at a part of the installation location of the structure, and concrete is poured into the frame and dried (cured).
Next, a water repellent material is applied to at least a part of the surface of the dried concrete structure (water repellent material applying step).
After the water repellent material application step, a paint containing a pigment is applied to the portion where the water repellent material is applied (paint application step), and after the paint has dried, the water repellent material and the paint are sequentially applied. Concrete is poured again into the part, dried and placed (placement process).
According to such a method, when concrete is handed over, the concrete is not placed directly on the water-repellent material, but is placed on the coating film containing the pigment. Therefore, concrete can be cast with sufficient adhesion strength, and a sufficient water entry suppression effect can be exhibited. The placing process may be repeated as necessary. In this case, the water-repellent material coating process and the paint coating process may be performed prior to each placing process.

以上説明したコンクリート類の構築方法は、橋、桟橋、トンネル、護岸、ダム、水門などのコンクリート類構造体を新たに建設したり、既存のものを補修したりする際に好適に適用できる。   The concrete construction method described above can be suitably applied to newly constructing concrete structures such as bridges, piers, tunnels, revetments, dams, and sluices, or repairing existing ones.

以下、本発明について、実施例を挙げて具体的に説明する。
[実施例1]
図示のように、厚さ2cmのJISR5201モルタル板11の片面に撥水材として、カジマ・リノベイト(株)製の「マジカルリペラー」(商品名、浸透性シランと浸透性シロキサンを含むシラン/シロキサン系撥水材、有効成分80質量%)を200g/m塗布し、23℃で24時間乾燥した。なお、撥水材はモルタル板11に浸透したので、図1においての撥水材の図示は略す。
ついで、その上に、酸化チタン顔料(平均粒子径280nm)、炭酸カルシウム顔料(平均粒子径10μm)、樹脂ビーズ(平均粒子径40μm)を乾燥塗膜中の含有量が合計55体積%となるように含有する藤倉化成(株)製の樹脂系塗料「マジカルカラー(商品名)」を100g/m塗布し、23℃で24時間乾燥し、塗膜12を形成した。
そして、形成された塗膜12の上に、セメントと砂との混合物(質量比1:1)である電気化学工業(株)製の「デンカ ハイプレタスコンTYPE1s」(商品名)と水とを質量比319:1875で混合したモルタル13を打設し、23℃で48時間乾燥した。
このようにして得られたものを評価用試料片10とし、以下のようにして付着強度を測定した。
Hereinafter, the present invention will be specifically described with reference to examples.
[Example 1]
As shown in the figure, a 2 cm-thick JIS R5201 mortar plate 11 has a magical repeller (trade name, silane / siloxane containing permeable silane and permeable siloxane) manufactured by Kajima Renovate Co., Ltd. as a water repellent material. 200 g / m 2 of a water-repellent material, 80% by mass of an active ingredient) was applied and dried at 23 ° C. for 24 hours. Since the water repellent material has permeated the mortar plate 11, the water repellent material is not shown in FIG.
Subsequently, a titanium oxide pigment (average particle diameter of 280 nm), a calcium carbonate pigment (average particle diameter of 10 μm), and resin beads (average particle diameter of 40 μm) are further added to the content of the dried coating film to 55% by volume. A resin-based paint “Magical Color (trade name)” manufactured by Fujikura Kasei Co., Ltd., contained in 100 g / m 2, was applied and dried at 23 ° C. for 24 hours to form a coating film 12.
And on the formed coating film 12, "Denka High Pretuce Con Type 1s" (trade name) made by Denki Kagaku Kogyo Co., Ltd., which is a mixture of cement and sand (mass ratio 1: 1), and water. Mortar 13 mixed at a mass ratio of 319: 1875 was cast and dried at 23 ° C. for 48 hours.
A sample piece 10 for evaluation was obtained as described above, and the adhesion strength was measured as follows.

[付着強度の測定]
打設されたモルタル13の上に、エポキシ樹脂接着剤14で鉄製アタッチメント15を接合し、エポキシ樹脂接着剤14が硬化した後、アタッチメント15の周縁に沿って塗膜12に切れ目(塗膜12の一面から他面に貫通する切れ目)12aを入れた。そして、建研式引っ張り試験機により、アタッチメント15を塗膜12に対して略垂直となる方向に引っ張った。そして、打設されたモルタル13と塗膜12との間、または、塗膜12とモルタル板11との間の少なくとも一方が剥離した際の引張力を測定し、これを付着強度とした。
その結果、実施例1では、打設されたモルタル13と塗膜12との間、塗膜12とモルタル板11との間の両方が剥離し、その際の付着強度は目標値である0.5N/mmを上回る2.18N/mmであった。
[Measurement of adhesion strength]
An iron attachment 15 is bonded to the placed mortar 13 with an epoxy resin adhesive 14, and after the epoxy resin adhesive 14 is cured, a cut (on the coating film 12 of the coating film 12 is formed along the periphery of the attachment 15. A cut 12a is formed which penetrates from one side to the other side. Then, the attachment 15 was pulled in a direction substantially perpendicular to the coating film 12 by a Kenken-type tensile tester. And the tensile force at the time of peeling between the mortar 13 and the coating film 12 which were laid or between the coating film 12 and the mortar board 11 was measured, and this was made into adhesive strength.
As a result, in Example 1, both the placed mortar 13 and the coating film 12 and between the coating film 12 and the mortar plate 11 were peeled off, and the adhesion strength at that time was 0. It was 2.18N / mm 2 greater than 5N / mm 2.

[実施例2~4、比較例1~2]
使用した塗料の種類と、塗料中の酸化チタン顔料などの顔料の配合量(含有量)を表1のように変更した以外は、実施例1と同様にして評価用試料片を作製し、同様に付着強度を測定した。結果を表1に示す。
なお、付着強度の測定において、実施例2では実施例1の場合と同様に、打設されたモルタル13と塗膜12との間、塗膜12とモルタル板11との間の両方が剥離した。実施例3および4では、打設されたモルタル13と塗膜12との間が剥離した。塗膜を形成せずにモルタルを打設した比較例1では、モルタル板と打設されたモルタルとの間が剥離した。
[Examples 2-4, Comparative Examples 1-2]
A sample piece for evaluation was prepared in the same manner as in Example 1 except that the type of paint used and the blending amount (content) of the pigment such as titanium oxide pigment in the paint were changed as shown in Table 1. The adhesion strength was measured. The results are shown in Table 1.
In the measurement of adhesion strength, in Example 2, as in Example 1, both the placed mortar 13 and the coating film 12 and both the coating film 12 and the mortar plate 11 were peeled off. . In Examples 3 and 4, the mortar 13 placed and the coating film 12 were separated. In Comparative Example 1 in which mortar was placed without forming a coating film, the mortar plate and the placed mortar were separated.

Figure 2007270503
Figure 2007270503

使用した塗料は以下のとおりである。フジクラペネトレEPおよびプラスタロイクリア以外の塗料は、いずれも酸化チタン顔料などの顔料を表1に示す濃度で含むアクリル樹脂系エマルション塗料である。
(塗料)
マジカルカラー:藤倉化成(株)製アクリルシリコン樹脂塗料
CFプライマー:藤倉化成(株)製アクリル樹脂塗料
フジクラシーラーフィラー:藤倉化成(株)製エポキシ変性アクリル樹脂塗料
セラミトーンHB:藤倉化成(株)製アクリルシリコン樹脂塗料
フジクラペネトレEP:藤倉化成(株)製エポキシ樹脂塗料
プラスタロイクリア:藤倉化成(株)製アクリルシリコン樹脂塗料
The paints used are as follows. The paints other than Fujikura Penetre EP and Plastaro Clear are acrylic resin emulsion paints containing pigments such as titanium oxide pigments at the concentrations shown in Table 1.
(paint)
Magical Color: Acrylic Silicone Resin Paint Made by Fujikura Kasei Co., Ltd. CF Primer: Acrylic Resin Paint Made by Fujikura Kasei Co., Ltd. Fujikura Sealer Filler: Epoxy-modified Acrylic Resin Paint Made by Fujikura Kasei Co., Ltd. Ceramitone HB: Acrylic Made by Fujikura Kasei Co., Ltd. Silicone resin paint Fujikura Penetre EP: Epoxy resin paint manufactured by Fujikura Kasei Co., Ltd. Plasterloy clear: Acrylic silicon resin paint manufactured by Fujikura Kasei Co., Ltd.

表1から明らかなように、顔料を含有する塗料を撥水材の上に塗布してから、モルタルを打設した各実施例では、十分な付着強度(0.5N/mmを以上)を達成できた。一方、塗料を塗布しない比較例1では十分な付着強度が得られず、顔料を含まない塗料を使用した比較例2および3ではモルタルの打設自体が困難で、付着強度の測定ができなかった。 As is apparent from Table 1, in each Example in which a mortar was placed after applying a paint containing a pigment on a water-repellent material, sufficient adhesion strength (0.5 N / mm 2 or more) was obtained. I was able to achieve it. On the other hand, in Comparative Example 1 in which no paint was applied, sufficient adhesion strength was not obtained, and in Comparative Examples 2 and 3 in which a paint containing no pigment was used, it was difficult to place the mortar, and the adhesion strength could not be measured. .

実施例1における付着強度の測定方法を説明する断面図である。3 is a cross-sectional view illustrating a method for measuring adhesion strength in Example 1. FIG.

Claims (6)

コンクリート類構造体にコンクリート類を打設する打設工程を有するコンクリート類構造体の構築方法であって、
前記打設工程の前に、前記コンクリート類構造体に撥水材を塗布する撥水材塗布工程と、前記撥水材が塗布された部分に顔料を含む塗料を塗布する塗料塗布工程とを有することを特徴とするコンクリート類構造体の構築方法。
A method for constructing a concrete structure having a placing process for placing concrete in a concrete structure,
Before the placing step, a water repellent material application step for applying a water repellent material to the concrete structure and a paint application step for applying a paint containing a pigment to a portion where the water repellent material is applied are provided. A method for constructing a concrete structure characterized by the above.
前記撥水材塗布工程の前に、前記コンクリート類構造体の一部を取り除く除去工程を有し、前記撥水材塗布工程では、前記除去工程で露出した露出部に対して、前記撥水材を塗布することを特徴とする請求項1に記載のコンクリート類構造体の構築方法。   Before the water-repellent material application step, there is a removal step of removing a part of the concrete structure. In the water-repellent material application step, the water-repellent material is exposed to the exposed portion exposed in the removal step The method for constructing a concrete structure according to claim 1, wherein: is applied. 前記撥水材は、浸透性シラン系撥水材および/またはシロキサン系撥水材であることを特徴とする請求項1または2に記載のコンクリート類構造体の構築方法。   The method for constructing a concrete structure according to claim 1 or 2, wherein the water repellent material is a permeable silane water repellent material and / or a siloxane water repellent material. 前記塗料は、乾燥塗膜中の顔料の含有量が15〜70体積%であることを特徴とする請求項1ないし3のいずれかに記載のコンクリート類構造体の構築方法。   The method for constructing a concrete structure according to any one of claims 1 to 3, wherein the paint has a pigment content in a dry coating film of 15 to 70% by volume. 前記塗料の塗布量が50〜500g/mであることを特徴とする請求項1ないし4のいずれかに記載のコンクリート類構造体の構築方法。 Method for constructing a concrete class structure according to any one of claims 1 to 4, wherein the coating amount of the coating is 50 to 500 g / m 2. 前記塗料は、アクリル樹脂系エマルション塗料であることを特徴とする請求項1ないし5のいずれかに記載のコンクリート類構造体の構築方法。

The method for constructing a concrete structure according to any one of claims 1 to 5, wherein the paint is an acrylic resin emulsion paint.

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JP2013249236A (en) * 2012-06-01 2013-12-12 Kajima Corp Method for preventing covering material of surface of concrete from expanding and expanding preventing covering material

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JPS62296063A (en) * 1986-06-12 1987-12-23 大串 義之 Method for adhering concrete casting joint surface
JPH0881249A (en) * 1994-07-14 1996-03-26 Kuraray Co Ltd Admixture and jointing material for cement mortar
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JPH0881249A (en) * 1994-07-14 1996-03-26 Kuraray Co Ltd Admixture and jointing material for cement mortar
JP2003049445A (en) * 2001-04-23 2003-02-21 Asahi Glass Polyurethane Material Co Ltd Waterproofing method
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013249236A (en) * 2012-06-01 2013-12-12 Kajima Corp Method for preventing covering material of surface of concrete from expanding and expanding preventing covering material

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