JP2009073695A - Water absorption preventing layer forming method - Google Patents

Water absorption preventing layer forming method Download PDF

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JP2009073695A
JP2009073695A JP2007244371A JP2007244371A JP2009073695A JP 2009073695 A JP2009073695 A JP 2009073695A JP 2007244371 A JP2007244371 A JP 2007244371A JP 2007244371 A JP2007244371 A JP 2007244371A JP 2009073695 A JP2009073695 A JP 2009073695A
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water absorption
absorption preventing
concrete body
permeable
permeable water
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Hisayuki Matsuo
久幸 松尾
Shinichi Usuha
信一 薄葉
Atsushi Takebe
敦士 武部
Satoshi Sato
智 佐藤
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Nippon Concrete Industries Co Ltd
Total Service Planning Co Ltd
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Nippon Concrete Industries Co Ltd
Total Service Planning Co Ltd
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    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/49—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
    • C04B41/4905—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
    • C04B41/4922—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon applied to the substrate as monomers, i.e. as organosilanes RnSiX4-n, e.g. alkyltrialkoxysilane, dialkyldialkoxysilane
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Aftertreatments Of Artificial And Natural Stones (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
  • Paints Or Removers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water absorption preventing layer forming method which can efficiently form a water absorption preventing layer on a concrete body. <P>SOLUTION: A permeable water absorption preventing material 3 to form the water absorption preventing layer 2 is applied on the surface of the concrete body 1. At least the portion of the concrete body 1 on which the permeable water absorption preventing material 3 is applied is covered with a blocking body 4. After a water absorption preventing layer 2 of the permeable water absorption preventing material 3 is formed on the concrete body 1, the blocking body 4 is removed from the concrete body 1. Thus, covering the portion on which the permeable water absorption preventing material 3 has been applied with the blocking body 4 after the permeable water absorption preventing material 3 has been applied can suppress volatilization of the permeable water absorption preventing material 3, and allows the permeable water absorption preventing material 3 to effectively permeate deeply into the interior of the concrete body 1, thereby efficiently forming the water absorption layer 2 on the concrete body 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、コンクリート体の表面に形成される吸水防止層の形成方法に関する。   The present invention relates to a method for forming a water absorption preventing layer formed on the surface of a concrete body.

従来、コンクリート体に形成された吸水防止層は、前記コンクリート体の表層に形成されて前記コンクリート体に吸水防止性能および撥水性能を付与し、前記コンクリート体への水分の浸透を防止できる。   Conventionally, a water absorption preventing layer formed on a concrete body is formed on the surface layer of the concrete body, imparts water absorption preventing performance and water repellency to the concrete body, and can prevent water penetration into the concrete body.

したがって、例えばアルカリ骨材反応や凍結融解、塩分浸透等の水分による不具合を防止でき、さらに、前記吸水防止層によって水分を弾くことができるので、前記コンクリート体の表面における例えば藻類や地衣類、かび等の汚れの発生や付着を防止できる。   Accordingly, it is possible to prevent problems due to moisture such as alkali aggregate reaction, freeze thawing, salt penetration, and the like, and further, moisture can be repelled by the water absorption preventing layer, so that, for example, algae, lichens, fungi on the surface of the concrete body. It is possible to prevent the occurrence and adhesion of dirt.

そして、アルキルアルコキシシランおよびポリオルガノシロキサンを有効成分としかつこの有効成分を水系媒体中に７５重量％以上の量で含有するシラン・シロキサン系浸透性吸水防止材を、一回塗りまたは重ね塗りで前記コンクリート体の表面に塗布し、前記コンクリート体の表層部に高密度なシリコン系の吸水防止性能を有する吸水防止層を形成することにより、前記コンクリート体の耐水性、耐凍害性を改善したコンクリートの改善方法が知られている（例えば、特許文献１参照。）。
特開２００２−６０２８３号公報（第２−４頁、図１） A silane / siloxane-based water-absorbing material having an alkylalkoxysilane and a polyorganosiloxane as active ingredients and containing the active ingredient in an aqueous medium in an amount of 75% by weight or more is applied once or repeatedly. It is applied to the surface of the concrete body, and a water-absorbing prevention layer having a high-density silicon-based water absorption prevention performance is formed on the surface of the concrete body, thereby improving the water resistance and frost damage resistance of the concrete body. An improvement method is known (for example, refer to Patent Document 1).
JP 2002-60283 A (page 2-4, FIG. 1)

しかしながら、上述した特許文献１のコンクリートの改善方法では、コンクリート体に所定の浸透深さの吸水防止層を形成するために、１００〜３００ｇ／ｍ２の浸透性吸水防止材を塗布する必要があり、塗布量が１００ｇ／ｍ２より少ないと、前記コンクリート体に十分な吸水防止性能を付与するための均一な前記吸水防止層を形成できない。また、３００ｇ／ｍ２を超えて前記浸透性吸水防止材を塗布すると、乾燥に長時間かかり、前記浸透性吸水防止材が揮発してしまう。 However, in the concrete improvement method of Patent Document 1 described above, it is necessary to apply a permeable water absorption preventing material of 100 to 300 g / m 2 in order to form a water absorption preventing layer having a predetermined penetration depth on the concrete body. When the coating amount is less than 100 g / m 2 , the uniform water absorption preventing layer for imparting sufficient water absorption preventing performance to the concrete body cannot be formed. Moreover, when the said permeable water absorption preventive material is applied exceeding 300 g / m < 2 >, drying will take a long time and the said permeable water absorption preventive material will volatilize.

したがって、前記浸透性吸水防止材を３００ｇ／ｍ２より多い塗布量で塗布し、より浸透深さの深い前記吸水防止層を形成して、前記コンクリート体の吸水防止性能および撥水性能を向上させるためには、１００〜２００ｇ／ｍ２の前記浸透性吸水防止材を重ね塗りしなければならない。 Therefore, the permeable water absorption preventing material is applied at a coating amount greater than 300 g / m 2 to form the water absorption preventing layer having a deeper penetration depth, thereby improving the water absorption preventing performance and water repellency performance of the concrete body. For this purpose, 100 to 200 g / m 2 of the permeable water absorption preventive material must be overcoated.

そして、前記浸透性吸水防止材を重ね塗りするには、先に塗布した浸透性吸水防止材を乾燥させてから再び前記浸透性吸水防止材を塗布しなければならず、前記浸透性吸水防止材を乾燥させるには、気温２０℃で９０分以上静置する必要があり、効率的に前記吸水防止層を形成できない問題が考えられる。   And in order to recoat the permeable water absorption preventive material, the permeable water absorption preventive material must be applied again after drying the previously applied permeable water absorbent preventive material. In order to dry the water, it is necessary to stand at a temperature of 20 ° C. for 90 minutes or more, and there is a problem that the water absorption preventing layer cannot be efficiently formed.

本発明はこのような点に鑑みなされたもので、コンクリート体に効率的に吸水防止層を形成できる吸水防止層形成方法を提供する。   This invention is made | formed in view of such a point, and provides the water absorption prevention layer formation method which can form a water absorption prevention layer efficiently in a concrete body.

請求項１に記載された吸水防止層形成方法は、吸水防止層を形成する浸透性吸水防止材をコンクリート体の表面に塗布し、前記コンクリート体の少なくとも前記浸透性吸水防止材が塗布された部分を遮蔽体によって覆い、前記コンクリート体に前記浸透性吸水防止材による吸水防止層が形成された後、前記コンクリート体から前記遮蔽体を外すものである。   The method for forming a water absorption preventing layer according to claim 1, wherein a permeable water absorption preventing material for forming a water absorption preventing layer is applied to the surface of a concrete body, and at least the permeable water absorption preventing material is applied to the concrete body. Is covered with a shielding body, and after the water absorption preventing layer is formed on the concrete body by the permeable water absorption preventing material, the shielding body is removed from the concrete body.

請求項２に記載された吸水防止層形成方法は、請求項１に記載された吸水防止層形成方法において、浸透性吸水防止材は、シラン、シロキサン、シランおよびシロキサンの複合物のいずれかから形成されたシリコン系浸透性吸水防止材であることを特徴とするものである。   The water absorption prevention layer forming method described in claim 2 is the water absorption prevention layer forming method described in claim 1, wherein the permeable water absorption prevention material is formed of any one of silane, siloxane, a silane and a siloxane composite. It is a silicon-based permeable water absorption preventing material.

請求項３に記載された吸水防止層形成方法は、請求項１または２に記載された吸水防止層形成方法において、遮蔽体は、フィルム体またはシート体であることを特徴とするものである。   The water absorption preventing layer forming method described in claim 3 is the water absorbing preventing layer forming method described in claim 1 or 2, wherein the shielding body is a film body or a sheet body.

請求項１に記載された発明によれば、浸透性吸水防止材をコンクリート体の表面に塗布した後、前記コンクリート体の少なくとも前記浸透性吸水防止材が塗布された部分を遮蔽体によって覆うことにより、前記浸透性吸水防止材の揮発を抑制して、この浸透性吸水防止材を有効に前記コンクリート体内部まで深く浸透させ、前記コンクリート体に効率的に吸水防止層を形成できる。   According to the invention described in claim 1, after applying the permeable water absorption preventing material to the surface of the concrete body, covering at least a portion of the concrete body to which the permeable water absorption preventing material is applied with the shielding body. The volatilization of the permeable water absorption preventing material can be suppressed, and the permeable water absorption preventing material can be effectively penetrated deeply into the concrete body, so that a water absorption preventing layer can be efficiently formed on the concrete body.

請求項２に記載された発明によれば、浸透性吸水防止材として、シラン、シロキサン、シランおよびシロキサンの複合物のいずれかから形成されたシリコン系浸透性吸水防止材を使用することにより、コンクリート体に高密度な吸水防止層を形成できる。   According to the invention described in claim 2, concrete is obtained by using a silicon-based water-absorbing material formed of any one of silane, siloxane, silane and a siloxane composite as the water-permeable water-absorbing material. A high-density water absorption preventing layer can be formed on the body.

請求項３に記載された発明によれば、遮蔽体として、フィルム体またはシート体を使用することにより、浸透性吸水防止材の揮発をより確実に抑制し、この浸透性吸水防止材をより有効に前記コンクリート体内部まで深く浸透できる。   According to the invention described in claim 3, by using a film body or a sheet body as the shielding body, volatilization of the permeable water absorption preventing material is more reliably suppressed, and this permeable water absorption preventing material is more effective. It can penetrate deeply into the concrete body.

以下、本発明の第１の実施の形態の構成について図１および図２を参照しながら詳細に説明する。   The configuration of the first embodiment of the present invention will be described in detail below with reference to FIGS.

図１（ａ）乃至（ｃ）は、コンクリート体１の吸水防止層２の形成工程を示す断面図であり、まず、図１（ａ）に示されるように、コンクリートを養生し硬化させたコンクリート体１の表面に吸水防止層２を形成する浸透性吸水防止材３を５０〜５００ｇ／ｍ２の範囲で例えばスプレーやローラ等によって塗布する。 1 (a) to 1 (c) are cross-sectional views showing a process of forming a water absorption preventing layer 2 of a concrete body 1. First, as shown in FIG. 1 (a), concrete is cured and hardened. The permeable water absorption preventing material 3 for forming the water absorption preventing layer 2 on the surface of the body 1 is applied in the range of 50 to 500 g / m 2 by, for example, a spray or a roller.

ここで、コンクリート体１とは、コンクリートを養生し硬化させたものであり、例えば、コンクリート壁体や橋架等のコンクリート構造物、電柱や高欄等のコンクリート製品、遠心成形を行った密度の高いコンクリート製品や既設のコンクリート構造物等である。   Here, the concrete body 1 is obtained by curing and hardening concrete, for example, concrete structures such as concrete walls and bridges, concrete products such as utility poles and railings, and high-density concrete subjected to centrifugal molding. Products and existing concrete structures.

そして、図１（ｂ）に示されるように、コンクリート体１の少なくとも浸透性吸水防止材３が塗布された部分に遮蔽体４を密着させるように覆う。   And as shown in FIG.1 (b), it covers so that the shield 4 may be closely_contact | adhered to the part to which at least the permeable water absorption preventive material 3 of the concrete body 1 was apply | coated.

コンクリート体１の浸透性吸水防止材３が塗布された部分を遮蔽体４によって覆うことにより、浸透性吸水防止材３の揮発を抑制し、浸透性吸水防止材３を有効にコンクリート体１内部まで浸透させ、吸水防止層２を効率的に形成できる。   By covering the portion of the concrete body 1 to which the permeable water absorption preventing material 3 is applied with the shielding body 4, the volatilization of the permeable water absorption preventing material 3 is suppressed, and the permeable water absorption preventing material 3 is effectively brought to the inside of the concrete body 1. The water absorption preventing layer 2 can be efficiently formed by permeation.

コンクリート体１の浸透性吸水防止材３が塗布された部分を遮蔽体４によって覆う際には、コンクリート体１に遮蔽体４を密着させて覆うことにより、浸透性吸水防止材３の揮発をより抑制できるので好ましいが、遮蔽体４を密着させることに限定はされず、密着させずにコンクリート体１の浸透性吸水防止材３が塗布された部分に被せるように覆うだけでもよい。   When covering the portion of the concrete body 1 to which the permeable water absorption preventive material 3 is applied with the shield 4, the permeable water absorption preventive material 3 is further volatilized by covering the concrete body 1 with the shield 4 in close contact. Although it can suppress, it is preferable, but it is not limited to making the shield 4 contact | adhered, You may just cover so that it may cover the part to which the permeable water absorption prevention material 3 of the concrete body 1 was apply | coated, without making it contact | adhere.

吸水防止層２を形成する際の浸透性吸水防止材３の塗布量は、５０〜５００ｇ／ｍ２の範囲であれば、遮蔽体４を覆うことにより、確実にコンクリート体１に浸透性吸水防止材３を浸透できるので好ましい。 If the coating amount of the permeable water absorption preventing material 3 when forming the water absorption preventing layer 2 is in the range of 50 to 500 g / m 2 , the permeable water absorption prevention is surely applied to the concrete body 1 by covering the shield 4. It is preferable because the material 3 can penetrate.

ここで、塗布量が５０ｇ／ｍ２より少ないと、浸透性吸水防止材３がコンクリート体１に均一に塗布できず塗布むらが発生してしまう。また、５００ｇ／ｍ２より多いと浸透性吸水防止材３の乾燥に時間がかかってしまい効率的に形成できず、専用の設備を使用することにより乾燥時間を短縮できるが、製造コストが高騰してしまう。 Here, if the application amount is less than 50 g / m 2 , the permeable water absorption preventing material 3 cannot be uniformly applied to the concrete body 1 and uneven application occurs. On the other hand, if it exceeds 500 g / m 2, it takes time to dry the permeable water absorption preventing material 3 and it cannot be formed efficiently, and the drying time can be shortened by using dedicated equipment, but the manufacturing cost increases. End up.

浸透性吸水防止材３としては、シラン、シロキサン、シランおよびシロキサンの複合物のいずれかから形成されたシリコン系の浸透性吸水防止材３を使用することにより、コンクリート体１に高密度な吸水防止層２を形成できるので好ましい。特に、例えばシランおよびシロキサンの複合物から形成されたマジカルリペラー（登録商標）を使用すると、マジカルリペラー（登録商標）はペースト状であるので、周囲への飛散や液垂れが生じ難く、塗布量の管理も容易なので施工性が良好であり、また、吸水防止層２形成後のコンクリート体１の外観が殆ど変化しないので好ましい。   As the permeable water absorption preventing material 3, the silicon body permeable water absorption preventing material 3 formed from any one of silane, siloxane, a silane and a siloxane composite is used to prevent high density water absorption in the concrete body 1. Since the layer 2 can be formed, it is preferable. In particular, when a Magical Repeller (registered trademark) formed from a composite of, for example, silane and siloxane is used, since the Magical Repeller (registered trademark) is in the form of a paste, scattering to the surroundings and dripping hardly occur. Since the amount can be easily controlled, the workability is good, and the appearance of the concrete body 1 after the formation of the water absorption preventing layer 2 is hardly changed, which is preferable.

遮蔽体４は、フィルム体またはシート体にすることにより、コンクリート体１の少なくとも浸透性吸水防止材３が塗布された部分を遮蔽体４によって覆う際に、遮蔽体４をコンクリート体１に巻きつけたり、貼着したりでき、確実に浸透性吸水防止材３の塗布部分を覆った状態を保持できるので好ましい。   When the shielding body 4 is a film body or a sheet body, the shielding body 4 is wrapped around the concrete body 1 when covering at least a portion of the concrete body 1 to which the permeable water absorption preventing material 3 is applied. It is preferable because it can be pasted and the state in which the coated portion of the permeable water absorption preventing material 3 is reliably covered can be maintained.

また、遮蔽体４は、非通気性を有するファイル体またはシート体であることが好ましく、例えば、ポリエチレンやポリプロピレン、ポリ塩化ビニル等の合成樹脂製の遮蔽体４とすることにより、合成樹脂は非通気性を有するので揮発しようとする浸透性吸水防止材３が遮蔽体４を通過し難く、浸透性吸水防止材３の揮発を確実に抑制でき、浸透性吸水防止材３がより有効にコンクリート体１内部まで深く浸透できるので好ましい。しかし、合成樹脂等の非通気性を有する素材には限定されず、例えば紙や布、金属にコーティングを施して通気性を抑えた状態にしたもの等でもよい。   The shielding body 4 is preferably a non-breathable file body or sheet body. For example, when the shielding body 4 is made of a synthetic resin such as polyethylene, polypropylene, or polyvinyl chloride, the synthetic resin is non-porous. Since it has air permeability, the permeable water absorption preventive material 3 to be volatilized does not easily pass through the shield 4, and the volatilization of the permeable water absorbent preventive material 3 can be reliably suppressed. 1 is preferable because it can penetrate deeply into the inside. However, the material is not limited to a non-breathable material such as a synthetic resin, and may be, for example, a paper, cloth, or metal that is coated with a coating to keep the breathability down.

図１（ｃ）に示されるように、コンクリート体１に浸透性吸水防止材３による吸水防止層２が形成された後、遮蔽体４をコンクリート体１から外す。   As shown in FIG. 1 (c), after the water absorption preventing layer 2 by the permeable water absorption preventing material 3 is formed on the concrete body 1, the shielding body 4 is removed from the concrete body 1.

吸水防止層２は、浸透性吸水防止材３を塗布することによりコンクリート体１の表層に浸透性吸水防止材３が浸透して形成された浸透層であり、コンクリート体１に吸水防止性能と撥水性能とを付与して水分の浸透を防止する。   The water absorption preventing layer 2 is a permeation layer formed by applying the permeable water absorption preventing material 3 to the surface layer of the concrete body 1 so that the permeable water absorption preventing material 3 penetrates the concrete body 1. Improves water performance and prevents water penetration.

なお、コンクリート体１では、吸水防止層２の浸透深さに若干ばらつきが発生している。これは、図２に示されるように、コンクリート体１を形成するコンクリートには骨材５が含まれており、この骨材５には、浸透性吸水防止材３が浸透し難く、骨材５がある部分では吸水防止層２の形成が浅くなるためである。   Note that, in the concrete body 1, a slight variation occurs in the penetration depth of the water absorption preventing layer 2. As shown in FIG. 2, the concrete that forms the concrete body 1 includes an aggregate 5, and the osmotic water absorption preventing material 3 hardly penetrates into the aggregate 5. This is because the formation of the water absorption preventing layer 2 becomes shallow at a certain portion.

しかしながら、この吸水防止層２の浸透深さのばらつきは若干であり、この程度のばらつきであれば、コンクリート体１に形成された吸水防止層２の吸水防止性能には影響を与えないので問題ない。   However, the variation in the penetration depth of the water absorption preventing layer 2 is slight, and if it is this level of variation, there is no problem because the water absorption preventing performance of the water absorption preventing layer 2 formed on the concrete body 1 is not affected. .

また、既設のコンクリート体１に浸透性吸水防止材３を塗布すると、コンクリート体１の表面に形成された微細な傷６の周囲に浸透性吸水防止材３が浸透するので、傷６の周囲にも吸水防止層２が形成され、傷６の中に水分が浸入することを防止でき、コンクリート体１に形成された傷６の周囲を保護できる。   Further, when the permeable water absorption preventing material 3 is applied to the existing concrete body 1, the permeable water absorption preventing material 3 penetrates around the fine scratches 6 formed on the surface of the concrete body 1. In addition, the water absorption preventing layer 2 is formed, moisture can be prevented from entering into the scratch 6, and the periphery of the scratch 6 formed in the concrete body 1 can be protected.

次に、上記第１の実施の形態の作用および効果を説明する。   Next, the operation and effect of the first embodiment will be described.

コンクリート体１での吸水防止層２の形成に際しては、コンクリートを養生し乾燥させたコンクリート体１の表面に浸透性吸水防止材３を５０〜５００ｇ／ｍ２塗布する。 In forming the water absorption preventing layer 2 on the concrete body 1, 50 to 500 g / m 2 of the permeable water absorption preventing material 3 is applied to the surface of the concrete body 1 which has been cured and dried.

そして、コンクリート体１の少なくとも浸透性吸水防止材３を塗布した部分を遮蔽体４によって覆う。   Then, at least a portion of the concrete body 1 to which the permeable water absorption preventing material 3 is applied is covered with the shielding body 4.

コンクリート体１の表層に吸水防止層２が形成された後、遮蔽体４をコンクリート体１から外す。   After the water absorption preventing layer 2 is formed on the surface layer of the concrete body 1, the shield 4 is removed from the concrete body 1.

コンクリート体１の浸透性吸水防止材３を塗布した部分に遮蔽体４を覆うことにより、コンクリート体１に塗布された浸透性吸水防止材３の揮発を抑制でき、浸透性吸水防止材３を有効にコンクリート体１に浸透できる。   Volatilization of the permeable water absorption preventive material 3 applied to the concrete body 1 can be suppressed by covering the portion of the concrete body 1 where the permeable water absorption preventive material 3 is applied with the shield 4, and the permeable water absorption preventive material 3 is effective. It can penetrate into the concrete body 1.

したがって、浸透性吸水防止材３をコンクリート体１内部までより深く浸透させることができ、コンクリート体１に吸水防止層２を効率的に形成できる。   Therefore, the permeable water absorption preventing material 3 can penetrate deeper into the concrete body 1, and the water absorption preventing layer 2 can be efficiently formed on the concrete body 1.

なお、この吸水防止層形成方法で形成した吸水防止層２の浸透深さは、従来の方法で形成したものと比較すると、約１．２〜１．６倍であり、また、従来の方法により形成されたものと同等の浸透深さの吸水防止層２を形成する場合は、浸透性吸水防止材３の塗布量を約６割に抑えられる。   In addition, the penetration depth of the water absorption preventing layer 2 formed by this water absorption preventing layer forming method is about 1.2 to 1.6 times that of the water absorbing preventing layer 2 formed by the conventional method. In the case of forming the water absorption preventing layer 2 having a penetration depth equivalent to that formed, the coating amount of the permeable water absorption preventing material 3 can be suppressed to about 60%.

このように、コンクリート体１に効率的に吸水防止層２を形成できるので重ね塗りを行う必要がなく、従来の吸水防止層形成方法と比較して、例えば浸透性吸水防止材３の塗布時間の短縮や塗布量の減量等が可能となり、作業効率を向上できる。   Thus, since the water absorption preventing layer 2 can be efficiently formed on the concrete body 1, it is not necessary to perform overcoating. Compared with the conventional water absorption preventing layer forming method, for example, the application time of the permeable water absorption preventing material 3 is reduced. Shortening, reduction of the coating amount, etc. are possible, and work efficiency can be improved.

また、コンクリート体１の少なくとも浸透性吸水防止材３が塗布された部分を遮蔽体４で覆うだけであるので、作業が容易であり、製造工程上の負荷になり難い。   In addition, since at least a portion of the concrete body 1 to which the permeable water absorption preventing material 3 is applied is only covered with the shielding body 4, the operation is easy and it is difficult to be a burden on the manufacturing process.

さらに、遮蔽体４は、他の用途に用いられているものをそのまま用いることができるので、専用の遮蔽体４を用意する必要がなく、製造コストの高騰を抑制できる。   Furthermore, since the shield 4 used for other purposes can be used as it is, it is not necessary to prepare the dedicated shield 4 and the increase in manufacturing cost can be suppressed.

コンクリート体１としてのコンクリート製品に吸水防止層形成方法で吸水防止層２を形成する場合は、コンクリート製品に浸透性吸水防止材３を塗布後、コンクリート製品全体を遮蔽体４で覆うと、遮蔽体４で覆った状態でそのまま保管でき、このように保管することにより、シート養生の効果が得られ、コンクリート体１の過度の乾燥を防止できるとともに、コンクリート体１の保管中での汚れの付着を防止でき、コンクリート体１の吸水防止層２形成後の作業工程を簡略化できる。   When the water absorption prevention layer 2 is formed on the concrete product as the concrete body 1 by the method of forming the water absorption prevention layer, after the permeable water absorption prevention material 3 is applied to the concrete product, the entire concrete product is covered with the shield 4. 4 can be stored as it is, and by storing in this way, the effect of sheet curing can be obtained, the excessive drying of the concrete body 1 can be prevented, and the adhesion of dirt during storage of the concrete body 1 can be prevented. The work process after the water absorption prevention layer 2 of the concrete body 1 is formed can be simplified.

浸透性吸水防止材３として、大小２種類の異なるシリコン分子により構成されたシランおよびシロキサンの複合物から形成されたシリコン系の浸透性吸水防止材３を使用することにより、分子径が小さいシリコン分子にてコンクリート体１の外表面より内部に吸水防止性の浸透層を形成でき、分子径の大きいシリコン分子にて浸透層の最上部に撥水性をそなえるメッシュ状のシラン・シロキサン結合層を形成できるので、コンクリート体１に高密度な吸水防止層２を形成できる。   By using the silicon-based permeable water absorption preventing material 3 formed from a composite of silane and siloxane composed of two different types of large and small silicon molecules as the permeable water absorption preventing material 3, silicon molecules having a small molecular diameter are used. Can form a water-absorbing osmotic layer from the outer surface of the concrete body 1 and can form a mesh-like silane / siloxane bond layer having water repellency at the top of the osmotic layer with silicon molecules having a large molecular diameter. Therefore, the high-density water absorption preventing layer 2 can be formed on the concrete body 1.

遮蔽体４として、ポリエチレンやポリプロピレン、ポリ塩化ビニル等の合成樹脂製の遮蔽体４を用いることにより、揮発しようとする浸透性吸水防止材３が遮蔽体４を通過し難いので、浸透性吸水防止材３の揮発を確実に抑制し、浸透性吸水防止材３をより有効にコンクリート体１内部まで深く浸透させて、より効率的に吸水防止層２を形成できる。   By using a shield 4 made of a synthetic resin such as polyethylene, polypropylene, or polyvinyl chloride as the shield 4, the permeable water absorption preventing material 3 to be volatilized is difficult to pass through the shield 4. The volatilization of the material 3 can be reliably suppressed, and the permeable water absorption preventing material 3 can be more effectively penetrated deeply into the concrete body 1 to form the water absorption preventing layer 2 more efficiently.

また、例えば電柱等のコンクリート体１を設置した際に、あるいは、設置後のコンクリート体１に傷６が形成された場合に、この吸水防止層形成方法を用いてメンテナンスを行うようにしてもよい。   Further, for example, when the concrete body 1 such as a utility pole is installed, or when a scratch 6 is formed on the concrete body 1 after installation, maintenance may be performed using this water absorption prevention layer forming method. .

コンクリート強度（ｆ´ｃｋ＝５０Ｎ／ｍｍ２）のコンクリートを蒸気養生後、材齢７日（σ７＝４０５０Ｎ／ｍｍ２）のコンクリート体１を試験体とし、浸透性吸水防止材３を１００ｇ／ｍ２または２００ｇ／ｍ２塗布し、そのまま静置したものと、浸透性吸水防止材３を塗布した部分をポリエチレン系合成樹脂の遮蔽体４によって覆ったものとで、吸水防止層２の浸透深さの計測を行った。 After steam curing the concrete with concrete strength (f′ck = 50 N / mm 2 ), the concrete body 1 with a material age of 7 days (σ7 = 4050 N / mm 2 ) is used as a test body, and the permeable water absorption preventing material 3 is 100 g / m. 2 or 200 g / m 2 applied and allowed to stand as it was, and the part where the permeable water absorption preventing material 3 was applied was covered with a polyethylene-based synthetic resin shield 4, and the penetration depth of the water absorption preventing layer 2 Was measured.

試験体番号１は、浸透性吸水防止材３を１００ｇ／ｍ２塗布後、従来と同様にそのまま静置したものである。 Specimen No. 1 is the one in which the permeable water absorption preventing material 3 is left as it is after applying 100 g / m 2 , as in the prior art.

試験体番号２は、浸透性吸水防止材３を１００ｇ／ｍ２塗布後、塗布部分をポリエチレン系合成樹脂製の遮蔽体４にて覆ったものである。 Test body number 2 is obtained by coating the permeable water absorption preventing material 3 with 100 g / m 2 and then covering the coated portion with a shield 4 made of a polyethylene synthetic resin.

試験体番号３は、浸透性吸水防止材３を２００ｇ／ｍ２塗布後、従来と同様にそのまま静置したものである。 Specimen No. 3 is the one in which the permeable water absorption preventing material 3 was left as it was after applying 200 g / m 2 , as in the conventional case.

試験体番号４は、浸透性吸水防止材３を２００ｇ／ｍ２塗布後、塗布部分をポリエチレン系合成樹脂製の遮蔽体４にて覆ったものである。 Test body No. 4 is obtained by applying 200 g / m 2 of the permeable water absorption preventing material 3 and then covering the coated portion with a shielding body 4 made of polyethylene synthetic resin.

なお、コンクリート体１に浸透性吸水防止材３を浸透させる場合は、コンクリートに含まれる骨材により浸透深さに若干のばらつきが生じるので、今回の計測では平均値を浸透深さとした。   Note that, when the permeable water absorption preventing material 3 is infiltrated into the concrete body 1, since the infiltration depth slightly varies depending on the aggregate contained in the concrete, the average value was set as the infiltration depth in this measurement.

表１に、吸水防止層２の浸透深さ測定の結果を示す。   Table 1 shows the results of the penetration depth measurement of the water absorption preventing layer 2.

Figure 2009073695
Figure 2009073695

表１に示されるように、浸透性吸水防止材３を１００ｇ／ｍ２塗布後、そのまま静置した試験体番号１の吸水防止層２の浸透深さは、２．２５ｍｍであった。 As shown in Table 1, the penetration depth of the water absorption preventing layer 2 of the test specimen No. 1 which was allowed to stand after applying the permeable water absorption preventing material 3 at 100 g / m 2 was 2.25 mm.

浸透性吸水防止材３を１００ｇ／ｍ２塗布後、この塗布部分をポリエチレン系合成樹脂製の遮蔽体４にて覆った試験体番号２の吸水防止層２の浸透深さは、３．６０ｍｍであった。 After application of the permeable water absorption preventing material 3 at 100 g / m 2 , the penetration depth of the water absorption preventing layer 2 of the test body number 2 in which the coated part was covered with the shielding body 4 made of polyethylene synthetic resin was 3.60 mm. there were.

浸透性吸水防止材３を２００ｇ／ｍ２塗布後、そのまま静置した試験体番号３の吸水防止層２の浸透深さは、３．０２ｍｍであった。 The penetration depth of the water absorption preventive layer 2 of the test specimen No. 3, which was allowed to stand after applying the permeable water absorption preventive material 3 at 200 g / m 2 , was 3.02 mm.

浸透性吸水防止材３を１００ｇ／ｍ２塗布後、この塗布部分をポリエチレン系合成樹脂製の遮蔽体４にて覆った試験体番号４の吸水防止層２の浸透深さは、４．１５ｍｍであった。 After application of the permeable water absorption preventing material 3 at 100 g / m 2 , the penetration depth of the water absorption preventing layer 2 of the test body number 4 in which the coated portion was covered with the shielding body 4 made of polyethylene synthetic resin was 4.15 mm. there were.

このように、浸透性吸水防止材３を１００ｇ／ｍ２塗布した場合または２００ｇ／ｍ２塗布した場合のいずれも、塗布部分をポリエチレン系合成樹脂製の遮蔽体４にて覆った方が吸水防止層２の浸透深さが深い。 As described above, in both cases where the permeable water absorption preventing material 3 is applied at 100 g / m 2 or 200 g / m 2, the water absorption is prevented by covering the coated portion with the shield 4 made of polyethylene synthetic resin. Layer 2 has a deep penetration depth.

これは、ポリエチレン系合成樹脂製の遮蔽体４によって浸透性吸水防止材３の揮発が抑制され、浸透性吸水防止材３が有効にコンクリート体１に浸透したからである。   This is because volatilization of the permeable water absorption preventive material 3 is suppressed by the shielding body 4 made of polyethylene synthetic resin, and the permeable water absorption preventive material 3 effectively penetrates into the concrete body 1.

したがって、コンクリート体１の少なくとも浸透性吸水防止材３を塗布した部分を、遮蔽体４にて覆うことにより、浸透性吸水防止材３を有効にコンクリート体１内部まで深く浸透させ、効率的に吸水防止層２を形成できる。   Therefore, by covering at least a portion of the concrete body 1 to which the permeable water absorption preventing material 3 is applied with the shielding body 4, the permeable water absorption preventing material 3 is effectively penetrated deeply into the concrete body 1 to efficiently absorb water. The prevention layer 2 can be formed.

（ａ）乃至（ｃ）は、本発明に係る吸水防止層形成方法の実施の形態を示す断面図である。(A) thru | or (c) are sectional drawings which show embodiment of the water absorption prevention layer forming method concerning this invention. 本発明に係る吸水防止層形成方法により形成されたコンクリート体を示す断面図である。It is sectional drawing which shows the concrete body formed by the water absorption prevention layer forming method concerning this invention.

符号の説明Explanation of symbols

１ コンクリート体
２ 吸水防止層
３ 浸透性吸水防止材
４ 遮蔽体 DESCRIPTION OF SYMBOLS 1 Concrete body 2 Water absorption prevention layer 3 Permeable water absorption prevention material 4 Shield

Claims (3)

吸水防止層を形成する浸透性吸水防止材をコンクリート体の表面に塗布し、
前記コンクリート体の少なくとも前記浸透性吸水防止材が塗布された部分を遮蔽体によって覆い、
前記コンクリート体に前記浸透性吸水防止材による吸水防止層が形成された後、前記コンクリート体から前記遮蔽体を外す
ことを特徴とする吸水防止層形成方法。 Apply a permeable water absorption prevention material that forms a water absorption prevention layer to the surface of the concrete body,
Covering at least a portion of the concrete body to which the permeable water absorption preventing material is applied with a shielding body,
A method for forming a water absorption preventing layer, comprising: forming a water absorption preventing layer by the permeable water absorption preventing material on the concrete body, and then removing the shielding body from the concrete body. 浸透性吸水防止材は、
シラン、シロキサン、シランおよびシロキサンの複合物のいずれかから形成されたシリコン系浸透性吸水防止材である
ことを特徴とする請求項１記載の吸水防止層形成方法。 The permeable water absorption prevention material is
The method for forming a water absorption preventing layer according to claim 1, wherein the water absorption preventing material is a silicon-based permeable water absorption preventing material formed from any of silane, siloxane, and a composite of silane and siloxane. 遮蔽体は、
フィルム体またはシート体である
ことを特徴とする請求項１または２記載の吸水防止層形成方法。 The shield is
It is a film body or a sheet | seat body. The water absorption prevention layer forming method of Claim 1 or 2 characterized by the above-mentioned.
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6479083A (en) * 1987-09-21 1989-03-24 Onoda Alc Kk Concrete product and its production
JPH0635352B2 (en) * 1986-01-10 1994-05-11 日産化学工業株式会社 Construction method for preventing deterioration of cement-based materials
JPH11255568A (en) * 1998-03-11 1999-09-21 Dai Nippon Construction Neutralization of concrete
JP2003048790A (en) * 2001-08-02 2003-02-21 Kajima Corp Surface coating construction method and section repairing construction method for concrete
JP2003221576A (en) * 2002-01-31 2003-08-08 Sumitomo Seika Chem Co Ltd Water absorption-preventing material
JP2004149768A (en) * 2002-10-07 2004-05-27 Toray Ind Inc Coating agent, method for producing structural body with hollow-containing layer and structural body with hollow-containing layer
JP2007045652A (en) * 2005-08-09 2007-02-22 Kajima Corp gamma-BELITE-CONTAINING CEMENT-BASED MATERIAL WITH IMPROVED CARBONATION POTENTIAL IN ACTUAL ENVIRONMENT

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0635352B2 (en) * 1986-01-10 1994-05-11 日産化学工業株式会社 Construction method for preventing deterioration of cement-based materials
JPS6479083A (en) * 1987-09-21 1989-03-24 Onoda Alc Kk Concrete product and its production
JPH11255568A (en) * 1998-03-11 1999-09-21 Dai Nippon Construction Neutralization of concrete
JP2003048790A (en) * 2001-08-02 2003-02-21 Kajima Corp Surface coating construction method and section repairing construction method for concrete
JP2003221576A (en) * 2002-01-31 2003-08-08 Sumitomo Seika Chem Co Ltd Water absorption-preventing material
JP2004149768A (en) * 2002-10-07 2004-05-27 Toray Ind Inc Coating agent, method for producing structural body with hollow-containing layer and structural body with hollow-containing layer
JP2007045652A (en) * 2005-08-09 2007-02-22 Kajima Corp gamma-BELITE-CONTAINING CEMENT-BASED MATERIAL WITH IMPROVED CARBONATION POTENTIAL IN ACTUAL ENVIRONMENT

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