JP3727820B2 - Reinforcing fiber sheet protective mortar and construction method of the protective mortar - Google Patents
Reinforcing fiber sheet protective mortar and construction method of the protective mortar Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、耐震補強工事に用いる補強用繊維シートの保護モルタルと、その保護モルタルの施工方法に関するものである。
【０００２】
【従来の技術】
一般に、コンクリートの構造物の耐震補強手段の一種として、炭素繊維、アラミド繊維等の種々の繊維シートによって補強する手段がある。
【０００３】
このような繊維シートによる補強は、従来では、補強しようとするコンクリート表面に繊維シートをエポキシ樹脂接着剤により複数回積層して張り付けることにより行われている。
【０００４】
【発明が解決しようとする課題】
しかし、このような補強手段によれば、施工された最終仕上面がエポキシ樹脂接着剤によって構成されることとなるため、熱に弱く、火災等が発生した場合にはエポキシ樹脂接着剤が燃焼するおそれがある。
【０００５】
また、エポキシ樹脂接着剤の接着面は、衝撃や摩擦等の物理的な損傷要因にも弱い。
【０００６】
そこで、これらの問題点を解決するために、最終仕上げ面を構成するエポキシ樹脂接着剤が硬化する前に、そのエポキシ樹脂接着剤に乾燥珪砂を散布し、その接着面に凹凸を形成して粗面化し、さらに鉄又はステンレスのメッシュをアンカー等で取り付けた上で、通常の左官モルタルを４cm以上塗り付ける工法も採用されている。
【０００７】
しかしながら、左官モルタルは火災等の熱に対するエポキシ樹脂接着剤の保護には有効であるが、本来エポキシ樹脂接着剤の表面にはモルタルは付着し難く、モルタルの剥離や浮きが発生し易いという新たな問題点が生じていた。
【０００８】
さらに、左官モルタルを４cm以上塗り重ねるために、施工の作業が煩雑になるという問題点もあった。
【０００９】
本発明は、このような問題点をすべて解決するためになされたもので、エポキシ樹脂接着剤の接着面に直接施工可能であり、耐久性が良好であるとともに高い付着性を有し、且つ最小１cmという従来の1/4 以下の厚さで熱や衝撃、摩擦等からエポキシ樹脂系接着剤の損傷を防止できる補強用繊維シート保護モルタルを提供することを課題とする。
【００１０】
【課題を解決するための手段】
本発明者等は、鋭意研究を重ねた結果、エポキシ樹脂系接着剤の上にポリマーディスパージョン又は再乳化形粉末樹脂の有機物の固形分量を変えたモルタルを２層に分けて塗り重ね、合量で１cm以上塗り重ねることで、モルタル全体として必要とされるエポキシ樹脂接着剤との付着性と不燃性という相反する２つの課題を同時に解決しうる保護モルタル層を形成できることを見出し、本発明を完成するに至った。
【００１１】
すなわち、本発明はこのような課題を解決するために、補強用繊維シート保護モルタルと、その保護モルタルの施工方法としてなされたもので、補強用繊維シート保護モルタルとしての特徴は、補強用繊維シートを保護する補強用繊維シート保護モルタルであって、水を除いたモルタル固形分全量に対して、５〜20重量％の固形分量のポリマーディスパージョン又は再乳化形粉末樹脂が配合された下層用モルタルと、２重量％以下の固形分量のポリマーディスパージョン又は再乳化形粉末樹脂が配合された上層用モルタルとからなることにある。
【００１２】
また、補強用繊維シート保護モルタルの施工方法としての特徴は、補強用繊維シートを保護する補強用繊維シート保護モルタルの施工方法であって、水を除いたモルタル固形分全量に対して、５〜20重量％の固形分量のポリマーディスパージョン又は再乳化形粉末樹脂が配合された下層用モルタルを補強用繊維シートに塗着し又は吹き付け、次に該下層用モルタルが硬化した後、水を除いたモルタル固形分全量に対して、２重量％以下の固形分量のポリマーディスパージョン又は再乳化形粉末樹脂が配合された上層用モルタルを塗着し又は吹き付けて施工することにある。
【００１３】
下層用モルタル中のポリマーディスパージョン又は再乳化形粉末樹脂の配合量を５〜20重量％としたのは、下層用モルタルの付着性は、通常の気象条件では良好であるが、万一の火災等により高温にさらされた場合には付着力が低下し、剥離が生ずる危険性があるため、モルタル固形分全量に対するポリマーディスパージョン又は再乳化形粉末樹脂の配合量を５〜20重量％とすれば、このような万一の場合の剥離等に対処しうるからである。
【００１４】
すなわち、ポリマーディスパージョン又は再乳化形粉末樹脂の配合量が５重量％以下では、高温にさらされた場合、付着力が低下し、剥離の危険性があり、20重量％以上では、付着力（部材強度）が低下するするとともに、ポリマーディスパージョン又は再乳化形粉末樹脂が高価なので不経済となるからである。
【００１５】
ここで、下層用モルタルは、上述のように５〜20重量％の固形分量のポリマーディスパージョン又は再乳化形粉末樹脂が配合されていることを前提に、施工厚さが２mm以下であることが、エポキシ樹脂接着剤との付着性を保持する上で好ましく、また上層用モルタルは、施工厚さが８mm以上であることが、不燃性を保持する上で好ましい。
【００１６】
上層用モルタル中のポリマーディスパージョン又は再乳化形粉末樹脂の配合量を２重量％以下としたのは、施工される上層用モルタルの厚さが８mm程度であると、ポリマーディスパージョン又は再乳化形粉末樹脂を２重量％以上配合すると、不燃性の確保が必ずしも図れないからである。
【００１７】
本発明において、セメントとしては、ポルトランドセメント、超速硬性セメント、又はこれらのセメントに高炉スラグ、フライアッシュ、シリカヒューム、石灰石粉、石膏等の混合材を混合した混合セメントが用いられる。
【００１８】
またポリマーディスパージョン又は再乳化形粉末樹脂としては、JIS A 6203に示されるポリアクリル酸エステル、スチレンブタジエン、エチレン酢酸ビニル等、セメント混和用として使用されているポリマーディスパージョン又は再乳化形粉末樹脂が用いられる。
【００１９】
さらに、骨材としては、珪砂、石灰石砂、軽量骨材等、モルタルに配合できるものを一種以上使用することができる。
【００２０】
また、モルタルのひび割れ発生抑制を目的として、短繊維を配合することも可能である。
【００２１】
短繊維としては、耐アルカリ性ガラス、炭素、アラミド、ビニロン、ポリプロピレン、ポリエチレン、アクリル等からなる短繊維を使用することができ、その長さ、直径は特に限定されるものではないが、繊維の長さが短くなると、ひび割れ抑止効果が低下し、逆に長くなると水との混練性及び施工性が悪化するため、繊維長が３〜20mmであることが好ましい。
【００２２】
また、セメントコンクリート用として使用できる高性能減水剤、増粘剤、消泡剤等流動性や作業性の機能付与に必要な混和剤を添加混合することもできる。
【００２３】
以上のような材料は、施工に必要な水と混練して繊維シート補強後の硬化したエポキシ樹脂接着剤上に直接吹き付け又はコテ、ローラー等により塗り付けて施工されるが、モルタル固形分全量に対するポリマーディスパージョン又は再乳化形粉末樹脂の固形全量を限定する必要がある。
【００２４】
すなわち、エポキシ樹脂接着剤の接着面に十分な接着性を発揮するためには、ポリマーディスパージョン又は再乳化形粉末樹脂を多く配合する必要があり、逆に火災等の熱からエポキシ樹脂系接着剤の燃焼を防止するためには少なくしなければならない。
【００２５】
そこで、本発明においては、上述のように、モルタル固形分量全量に対するポリマーディスパージョン又は再乳化形粉末樹脂の必要な固形分量が、エポキシ樹脂系接着剤の接着面に直接塗着し又は吹き付ける下層用モルタルでは５〜20重量％であり、下層用モルタルに塗着し又は吹き付ける上層用モルタルでは２重量％以下であることを見出したのである。
【００２６】
【実施例】
以下、本発明の実施例について説明する。
【００２７】
（試験例１）
エポキシ樹脂プライマー、エポキシ樹脂接着剤、炭素繊維シート、エポキシ樹脂接着剤、炭素繊維シート、エポキシ樹脂接着剤の順で表面に積層して接着させたコンクリート板に、表１に示す割合で配合した実施例１及び実施例２の下層用モルタル及び上層用モルタルの２種類を塗り重ねて、保護モルタルの材齢28日において接着強度を測定した。
【００２８】
下層用モルタルは、普通ポルトランドセメント100 重量部、乾燥珪砂100 重量部、ナフタレンスルホン酸塩系高性能減水剤0.2 重量部を混合した粉体と、ポリアクリル酸エステル系ポリマーディスパージョン（固形分45％）と水とを表１に示す割合で配合し、ハンドミキサーで２分間混練し、上記コンクリート板にコテで塗り付けた。
【００２９】
さらに、この下層用モルタルが硬化した後、上層用モルタルとして、早強ポルトランドセメント100 重量部に対して、乾燥珪砂100 重量部、繊維長６mmのビニロン繊維1.0 重量部、ナフタレンスルホン酸塩系高性能減水剤0.4 重量部、メチルセルロース系増粘剤0.02重量部を混合した粉体とポリアクリル酸エステル系ポリマーディスパージョン（固形分45％）と水とを表１に示す割合で配合し、ハンドミキサーで２分間混練し、硬化した下層用保護モルタル上へコテで塗り付けた。
【００３０】
比較例１乃至比較例４として、表１に示す配合のものについて同様の試験を行った。
【００３１】
結果を表１に示す。
【００３２】
【表１】
表１からも明らかなように、実施例１及び実施例２、並びに比較例２及び比較例４では接着強度が良好であったが、ポリマーディスパージョンが配合されていない比較例１、及びポリマーディスパージョンが多く配合されている比較例３では接着強度が非常に弱かった。
【００３４】
（試験例２）
エポキシ樹脂プライマー、エポキシ樹脂接着剤、炭素繊維シート、エポキシ樹脂接着剤、炭素繊維シート、エポキシ樹脂接着剤の順で表面に積層して接着させた石綿セメントパーライト板に、表１に示す割合で配合した実施例１及び実施例２の下層用モルタル及び上層用モルタルの２種類を塗り重ねて、保護モルタルの材齢28日において昭和45年建設省告示第1828号に規定される不燃材料の表面試験方法に準じて不燃性試験を行った。
【００３５】
比較例１乃至比較例４として、表１に示す配合のものについて同様の試験を行った。
【００３６】
結果を表１に示す。
【００３７】
表１からも明らかなように、実施例１及び実施例２、並びに比較例１，３，４では不燃焼評価は良好であったが、ポリマーディスパージョンが15重量部配合されている比較例２では不燃焼評価は悪かった。
【００３８】
また、下層用モルタル中のポリマーディスパージョンの配合量の少ない比較例１，２，４では、付着性が低いことが確認された。
【００３９】
尚、上記実施例では、上層用モルタル及び下層用モルタルが、塗着によって形成されているが、塗着に限らず、吹き付けによって形成されていてもよい。
【００４０】
【発明の効果】
叙上のように、本発明の繊維シート保護モルタルを使用すると、繊維シート補強の最終エポキシ樹脂面への施工性、接着性に優れ、且つ不燃性や耐衝撃性等の保護機能付与に優れた繊維シート補強のエポキシ樹脂の保護ができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protective mortar for reinforcing fiber sheets used in seismic reinforcement work, and a method for constructing the protective mortar.
[0002]
[Prior art]
In general, as one type of seismic reinforcement means for concrete structures, there are means for reinforcement with various fiber sheets such as carbon fibers and aramid fibers.
[0003]
Such reinforcement by a fiber sheet is conventionally performed by laminating and sticking a fiber sheet to the concrete surface to be reinforced by an epoxy resin adhesive a plurality of times.
[0004]
[Problems to be solved by the invention]
However, according to such a reinforcing means, since the final finished surface that has been constructed is made of an epoxy resin adhesive, the epoxy resin adhesive is burned when a fire or the like occurs due to heat resistance. There is a fear.
[0005]
Further, the adhesive surface of the epoxy resin adhesive is also vulnerable to physical damage factors such as impact and friction.
[0006]
Therefore, in order to solve these problems, before the epoxy resin adhesive constituting the final finished surface is cured, dry silica sand is sprayed on the epoxy resin adhesive to form irregularities on the adhesive surface. A method of applying a normal plastering mortar of 4 cm or more after surfaceizing and attaching an iron or stainless steel mesh with an anchor or the like is also employed.
[0007]
However, plastering mortar is effective in protecting the epoxy resin adhesive against heat such as fire, but the mortar does not easily adhere to the surface of the epoxy resin adhesive, and the new mortar is liable to peel or float. There was a problem.
[0008]
Furthermore, since the plastering mortar is overlaid by 4 cm or more, there is a problem that the construction work becomes complicated.
[0009]
The present invention has been made to solve all of these problems, and can be directly applied to the adhesive surface of an epoxy resin adhesive, has good durability, high adhesion, and minimum It is an object of the present invention to provide a reinforcing fiber sheet protective mortar that can prevent damage to the epoxy resin adhesive from heat, impact, friction, and the like with a thickness of 1/4 or less of the conventional one.
[0010]
[Means for Solving the Problems]
As a result of intensive research, the inventors of the present invention have repeatedly applied the mortar in which the solid content of the organic substance of the polymer dispersion or the re-emulsified powder resin is divided into two layers on the epoxy resin adhesive, It is found that a protective mortar layer that can simultaneously solve the two conflicting problems of adhesion and non-flammability with the epoxy resin adhesive required for the mortar as a whole can be formed by recoating 1 cm or more. It came to do.
[0011]
That is, in order to solve such problems, the present invention was made as a reinforcing fiber sheet protective mortar and a construction method of the protective mortar. A mortar for reinforcing a lower layer in which a polymer dispersion or a re-emulsifying powder resin having a solid content of 5 to 20% by weight is blended with respect to the total amount of the mortar solid content excluding water. And a mortar for an upper layer in which a polymer dispersion having a solid content of 2% by weight or less or a re-emulsifying powder resin is blended.
[0012]
Moreover, the feature as a construction method of the reinforcing fiber sheet protective mortar is a construction method of the reinforcing fiber sheet protective mortar for protecting the reinforcing fiber sheet, and is 5 to 5% of the total amount of mortar solid content excluding water. A lower layer mortar containing a polymer dispersion or a re-emulsifying powder resin with a solid content of 20% by weight was applied to or sprayed on the reinforcing fiber sheet, and then the lower layer mortar was cured, and then water was removed. The object is to apply or spray the upper layer mortar in which the polymer dispersion or the re-emulsifying powder resin having a solid content amount of 2% by weight or less is mixed with the total amount of the mortar solid content.
[0013]
The amount of the polymer dispersion or re-emulsifying powder resin in the lower layer mortar was set to 5 to 20% by weight. The adhesion of the lower layer mortar is good under normal weather conditions, but in the unlikely event of a fire When exposed to high temperatures, etc., there is a risk that adhesion will be reduced and peeling will occur, so the blending amount of polymer dispersion or re-emulsified powder resin with respect to the total amount of mortar solids should be 5 to 20% by weight. This is because it is possible to deal with such a peeling in case of an emergency.
[0014]
That is, when the blended amount of the polymer dispersion or the re-emulsified powder resin is 5% by weight or less, there is a risk of peeling when exposed to a high temperature, and there is a risk of peeling. This is because the strength of the member is reduced and the polymer dispersion or the re-emulsified powder resin is expensive, which is uneconomical.
[0015]
Here, the mortar for the lower layer may have a construction thickness of 2 mm or less on the assumption that the polymer dispersion or the re-emulsified powder resin having a solid content of 5 to 20% by weight is blended as described above. From the standpoint of maintaining adhesion to the epoxy resin adhesive, the upper layer mortar preferably has a construction thickness of 8 mm or more in order to maintain nonflammability.
[0016]
The amount of the polymer dispersion or re-emulsification type powder resin in the upper layer mortar is set to 2% by weight or less. When the thickness of the upper layer mortar to be applied is about 8 mm, the polymer dispersion or re-emulsification type This is because if the powder resin is blended in an amount of 2% by weight or more, nonflammability cannot always be ensured.
[0017]
In the present invention, as the cement, Portland cement, ultrafast cement, or a mixed cement obtained by mixing a mixed material such as blast furnace slag, fly ash, silica fume, limestone powder, or gypsum with these cements is used.
[0018]
Examples of the polymer dispersion or re-emulsion type powder resin include polyacrylic acid ester, styrene butadiene, ethylene vinyl acetate and the like, which are used for cement mixing, as shown in JIS A 6203. Used.
[0019]
Furthermore, as the aggregate, one or more types that can be blended in mortar, such as silica sand, limestone sand, and lightweight aggregate, can be used.
[0020]
Moreover, it is also possible to mix | blend a short fiber for the purpose of cracking suppression of mortar.
[0021]
As the short fiber, a short fiber made of alkali-resistant glass, carbon, aramid, vinylon, polypropylene, polyethylene, acrylic, etc. can be used, and its length and diameter are not particularly limited. When the length is shortened, the effect of inhibiting cracking is lowered. On the other hand, when the length is longer, the kneadability with water and the workability are deteriorated. Therefore, the fiber length is preferably 3 to 20 mm.
[0022]
In addition, admixtures necessary for imparting fluidity and workability functions such as high-performance water reducing agents, thickeners and antifoaming agents that can be used for cement concrete can also be added and mixed.
[0023]
The above materials are applied by spraying directly on the cured epoxy resin adhesive after fiber sheet reinforcement after kneading with water necessary for construction, or by applying a trowel, roller, etc., but with respect to the total amount of mortar solids It is necessary to limit the total solid amount of the polymer dispersion or re-emulsified powder resin.
[0024]
That is, in order to exhibit sufficient adhesiveness on the adhesive surface of the epoxy resin adhesive, it is necessary to blend a large amount of polymer dispersion or re-emulsified powder resin, and conversely, the epoxy resin adhesive from heat such as fire It must be reduced to prevent burning.
[0025]
Therefore, in the present invention, as described above, the required solid content of the polymer dispersion or the re-emulsified powder resin with respect to the total amount of the mortar solid content is applied directly to the adhesive surface of the epoxy resin adhesive or sprayed for the lower layer. It was found to be 5 to 20% by weight for mortar, and 2% by weight or less for upper layer mortar to be applied to or sprayed on the lower layer mortar.
[0026]
【Example】
Examples of the present invention will be described below.
[0027]
(Test Example 1)
Implementation in which the ratio shown in Table 1 was applied to a concrete board laminated and adhered to the surface in the order of epoxy resin primer, epoxy resin adhesive, carbon fiber sheet, epoxy resin adhesive, carbon fiber sheet, epoxy resin adhesive Two types of mortar for lower layer and mortar for upper layer of Example 1 and Example 2 were applied again, and the adhesive strength was measured at the age of 28 days of the protective mortar.
[0028]
The mortar for the lower layer consists of a powder containing 100 parts by weight of ordinary Portland cement, 100 parts by weight of dry silica sand and 0.2 parts by weight of a naphthalene sulfonate high-performance water reducing agent, and a polyacrylate polymer dispersion (45% solids) ) And water in the proportions shown in Table 1, kneaded with a hand mixer for 2 minutes, and applied to the concrete plate with a trowel.
[0029]
Furthermore, after this lower layer mortar is cured, the upper layer mortar is 100 parts by weight of early strength Portland cement, 100 parts by weight of dry silica sand, 1.0 part by weight of vinylon fiber with a fiber length of 6 mm, and high performance naphthalene sulfonate. Mix the powder with 0.4 parts by weight of water reducing agent, 0.02 parts by weight of methylcellulose thickener, polyacrylate polymer dispersion (solid content 45%) and water in the proportions shown in Table 1 and use a hand mixer. The mixture was kneaded for 2 minutes and applied onto the cured protective mortar for the lower layer with a trowel.
[0030]
As Comparative Examples 1 to 4, the same tests were conducted for the formulations shown in Table 1.
[0031]
The results are shown in Table 1.
[0032]
[Table 1]
As is clear from Table 1, in Examples 1 and 2, and Comparative Examples 2 and 4, the adhesive strength was good, but Comparative Example 1 in which no polymer dispersion was blended, and the polymer dispersion. In Comparative Example 3 in which a lot of John was blended, the adhesive strength was very weak.
[0034]
(Test Example 2)
Blended in the proportions shown in Table 1 to asbestos-cement pearlite plates laminated and adhered to the surface in the order of epoxy resin primer, epoxy resin adhesive, carbon fiber sheet, epoxy resin adhesive, carbon fiber sheet, epoxy resin adhesive Two types of mortar for lower layer and upper layer mortar of Example 1 and Example 2 were applied, and surface test of non-combustible material specified in Ministry of Construction Notification No. 1828 in 1985 at the age of 28 days of protective mortar A nonflammability test was conducted according to the method.
[0035]
As Comparative Examples 1 to 4, the same tests were conducted for the formulations shown in Table 1.
[0036]
The results are shown in Table 1.
[0037]
As is apparent from Table 1, incombustibility evaluation was good in Examples 1 and 2, and Comparative Examples 1, 3, and 4, but Comparative Example 2 in which 15 parts by weight of polymer dispersion was blended. Then, the non-burning evaluation was bad.
[0038]
Moreover, it was confirmed that Comparative Examples 1, 2, and 4 in which the amount of the polymer dispersion in the lower layer mortar is low have low adhesion.
[0039]
In addition, in the said Example, although the mortar for upper layers and the mortar for lower layers are formed by application, you may form not only by application but by spraying.
[0040]
【The invention's effect】
As described above, when the fiber sheet protective mortar of the present invention is used, the workability and adhesion to the final epoxy resin surface of the fiber sheet reinforcement are excellent, and excellent protection functions such as incombustibility and impact resistance are excellent. It can protect the epoxy resin of fiber sheet reinforcement.
Claims (6)
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| KR101880068B1 (en) * | 2017-06-05 | 2018-07-19 | 소치재 | Mortar ready to stick and Method for construction using the same |
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