JPH07189379A - Permanently embedded formwork for highly durable concrete - Google Patents

Permanently embedded formwork for highly durable concrete

Info

Publication number
JPH07189379A
JPH07189379A JP34688193A JP34688193A JPH07189379A JP H07189379 A JPH07189379 A JP H07189379A JP 34688193 A JP34688193 A JP 34688193A JP 34688193 A JP34688193 A JP 34688193A JP H07189379 A JPH07189379 A JP H07189379A
Authority
JP
Japan
Prior art keywords
formwork
concrete
cement
fiber
permanent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP34688193A
Other languages
Japanese (ja)
Inventor
Kimio Yoshimi
仁男 吉見
Yoshiyuki Tobiuchi
圭之 飛内
Kagao Watai
加賀雄 渡井
Yukinori Kawahara
幸則 河原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to JP34688193A priority Critical patent/JPH07189379A/en
Publication of JPH07189379A publication Critical patent/JPH07189379A/en
Withdrawn legal-status Critical Current

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Abstract

PURPOSE:To provide an excellent weather proof quality by forming a permanently embedded formwork for concrete whose formwork material consists of cement and fiber, conducting the integration of this embedded formwork and placed concrete. CONSTITUTION:A permanently embedded formwork 1 for concrete having the pore rate of 10%-25% and the bending strength of 8MPa-45MPa is formed, and the formwork material of this embedded formwork 1 is formed of cement and fiber, and the weight percentage of the cement is made to be 80wt.%-99wt.% and that of the fiber is made to be 20wt.%-1wt.%. Next, the back of the embedded formwork 1 possesses projecting portions 11 and recessed portions 12, and a concrete structure of high strength is formed by conducting the integration of the embedded formwork 1 and placed concrete. Accordingly, a structure excellent in durability can be obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、コンクリート用永久埋
設型枠及びそれを用いたコンクリート構造物に関するも
のであり、更に詳しくは高耐久性、即ち耐候性に優れ、
しかも高強度を有するコンクリート用永久埋設型枠及び
それを用いたコンクリート構造物に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent buried formwork for concrete and a concrete structure using the same, more specifically, it has high durability, that is, excellent weather resistance.
Moreover, the present invention relates to a permanent buried formwork for concrete having high strength and a concrete structure using the same.

【0002】[0002]

【従来の技術】従来、一般に建築物等の型枠工法に用い
られる型枠材は、脱型して再利用することを前提として
使用されており、このような型枠構造としては、通常コ
ンパネと呼ばれる合板や鋼製材が使用されている。この
他近年、各種の材質で形成した型枠が使用乃至試みられ
ている。例えば薄いコンクリート板、ガラス繊維強化セ
メント板等の型枠、軽量化と美観を追求したFRP(繊
維強化プラスチック)製、リサイクルを目的としたもの
で硬質紙製捨て型枠や近年新しい型枠として不織布と木
製型枠併用した透水性型枠等がある。
2. Description of the Related Art Conventionally, formwork materials generally used in the formwork construction method for buildings and the like have been used on the premise that they are demolded and reused. Plywood and steel lumber called is used. In recent years, molds made of various materials have been used or tried. For example, thin concrete boards, glass fiber reinforced cement boards and other forms, FRP (fiber reinforced plastic) products that are lightweight and aesthetically pleasing, and for the purpose of recycling hard paper waste forms and non-woven fabrics as new forms in recent years. There is also a water-permeable formwork that uses a wooden formwork.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、前述の
如き型枠は、材質の違いによる固有の欠点を有してお
り、木製型枠や樹脂製型枠等では永久型枠で使用するた
めには耐火性に劣るという問題があり、また不織布と木
製型枠併用した透水性型枠や硬質紙製捨て型枠では、透
水性を有する点で好ましいが、半永久的に使用し得る耐
久性というと問題があり、更に鋼製材、樹脂製及びFR
P製では吸水性、透水性等の性能がなく、したがって打
設するコンクリートを改質する作用がないので、良好な
コンクリート製構造物を得ることができないという問題
がある。一方、木製型枠の使用は、近年環境破壊の問
題、木材資源の削減や打設工法の短縮等の要望により、
これに代る型枠建材、特に埋設型の型枠が求められるよ
うになった。
However, the formwork as described above has an inherent drawback due to the difference in the material, and in order to use it in a permanent formwork such as a wooden formwork or a resin formwork, etc. There is a problem that it is inferior in fire resistance, and a water-permeable mold that uses a non-woven fabric and a wooden mold together or a discard mold made of hard paper is preferable because it has water permeability, but there is a problem with durability that can be used semipermanently There is also steel material, resin and FR
There is a problem in that a good concrete structure cannot be obtained because the product made of P does not have properties such as water absorption and water permeability and therefore has no function of modifying the concrete to be placed. On the other hand, the use of wooden formwork has been a problem in recent years due to environmental problems, demand for reducing wood resources and shortening the construction method, etc.
Alternative formwork building materials, especially buried formwork, have been demanded.

【0004】そこで、本発明者は、このような問題点に
ついて、検討した結果、セメントを成分とする型枠材と
しての条件は、打設したコンクリートの余剰水を吸収
して、内部コンクリートの水セメント比を小さくするこ
とが必要であり、このような吸収作用を持たせるには型
枠素材として10%〜25%の気孔率とする必要があ
る。型枠のメンテナンスフリー(保持、管理を必要と
しない)とするためには、耐候性に優れていることが必
須条件で、かつ型枠素材の曲げ強度が8MPa〜45M
Paという強度を必要とするという2点である。
Therefore, as a result of studying such a problem, the present inventor found that the condition of the formwork material containing cement is that the excess water of the placed concrete is absorbed and the water of the internal concrete is absorbed. It is necessary to reduce the cement ratio, and in order to have such an absorbing effect, it is necessary to make the porosity of the mold material 10% to 25%. In order to make the formwork maintenance-free (no need to hold or manage), excellent weather resistance is a prerequisite, and the bending strength of the formwork material is 8 MPa to 45 M.
There are two points that a strength of Pa is required.

【0005】したがって、この2点を満足する型枠素材
について、更に究明したところ、セメントと繊維からな
る型枠が埋設型枠として優れた性能を有するものである
ことを見出し、ここに本発明をするに至った。よって本
発明が解決しようとする課題は、高耐久性、即ち耐候性
に優れ、しかも高強度を有するコンクリート用永久埋設
型枠を提供することにある。
Therefore, when the formwork material satisfying these two points was further investigated, it was found that the formwork made of cement and fiber had excellent performance as an embedded formwork, and the present invention is hereby found. Came to do. Therefore, the problem to be solved by the present invention is to provide a permanent buried formwork for concrete which has high durability, that is, excellent weather resistance and high strength.

【0006】[0006]

【課題を解決するための手段】本発明が解決しようとす
る課題は、以下の各発明によって達成される。 (1)10%〜25%の気孔率と8MPa以上の曲げ強
度を有するコンクリート用永久埋設型枠であって、型枠
素材がセメント及び繊維からなり、前記埋設型枠は打設
コンクリートと一体化されることを特徴とするコンクリ
ート用永久埋設型枠。
The problems to be solved by the present invention are achieved by the following inventions. (1) A permanent embedding formwork for concrete having a porosity of 10% to 25% and a bending strength of 8 MPa or more, wherein the formwork material is cement and fiber, and the embedding formwork is integrated with cast concrete. Permanently buried formwork for concrete, which is characterized by:

【0007】(2)型枠素材に砂が添加されていること
を特徴とする前記第1項に記載のコンクリート用永久埋
設型枠。
(2) The permanent buried formwork for concrete as described in the above item 1, characterized in that sand is added to the formwork material.

【0008】(3)曲げ強度が8MPa〜45MPaで
あることを特徴とする前記第1項又は第2項のいづれか
に記載のコンクリート用永久埋設型枠。
(3) The permanent buried formwork for concrete as described in any one of the above items 1 and 2, wherein the bending strength is 8 MPa to 45 MPa.

【0009】(4)セメント80重量%〜99重量%と
繊維20重量%〜1重量%とからなることを特徴とする
前記第1項乃至第3項のいづれかに記載のコンクリート
用永久埋設型枠。
(4) Cement 80% to 99% by weight and fiber 20% to 1% by weight, the permanent buried formwork for concrete according to any one of the above items 1 to 3. .

【0010】(5)繊維が無機系天然繊維、有機系天然
繊維又は合成繊維から選ばれた少なくとも1種以上であ
ることを特徴とする前記第1項乃至第4項のいづれかに
記載のコンクリート用永久埋設型枠。
(5) For concrete according to any one of the above items 1 to 4, wherein the fiber is at least one kind selected from inorganic natural fibers, organic natural fibers and synthetic fibers. Permanently buried formwork.

【0011】(6)型枠裏面が凹凸状に形成されている
ことを特徴とする前記第1項乃至第5項のいづれかに記
載のコンクリート用永久埋設型枠。
(6) The permanent buried formwork for concrete according to any one of the above items 1 to 5, wherein the back surface of the formwork is formed in an uneven shape.

【0012】(7)前記第1項乃至第6項のいづれかに
記載のコンクリート用永久埋設型枠と打設コンクリート
からなるコンクリート構造物。
(7) A concrete structure comprising a permanent buried formwork for concrete according to any one of the above items 1 to 6 and cast concrete.

【0013】以下、本発明について、更に詳しく説明す
ると、本発明のコンクリート用永久埋設型枠は、10%
〜25%の気孔率と8MPa以上の曲げ強度を有するコ
ンクリート用永久埋設型枠を構成するもので、型枠素材
がセメント及び繊維からなることによって、高耐久性に
優れた埋設型枠が得られ、該埋設型枠は施工後、コンク
リートと一体化されることにより、更にいっそう耐候性
及び曲げ強度の優れたコンクリート構造物が得られる。
The present invention will be described in more detail below. The permanent buried formwork for concrete of the present invention is 10%.
It constitutes a permanent buried formwork for concrete having a porosity of -25% and a bending strength of 8 MPa or more. By using a cement and fiber as the formwork material, a buried formwork excellent in high durability can be obtained. After the construction, the embedded formwork is integrated with the concrete to obtain a concrete structure further excellent in weather resistance and bending strength.

【0014】本発明のコンクリート用永久埋設型枠の奏
する効果として、耐久性が優れているが、この耐久性
は、曲げ強度と、中性化防止、塩分浸透防止、更には凍
害防止等や紫外線、風雨、更には酸性雨等の耐候性の2
種類の効果をいうものである。本発明のコンクリート用
永久埋設型枠を構成する素材としては、セメント及び繊
維であり、このセメントとしては、普通ポルトランドセ
メントを始め、早強ポルトランドセメント、超早強ポル
トランドセメントなどのポルトランドセメント、高炉セ
メント、シリカセメント、フライアッシュセメント等の
混合セメント、アルミナセメント等の任意のものが用い
られる。
The permanent burying formwork for concrete of the present invention has excellent durability, which is excellent in bending strength, neutralization prevention, salt penetration prevention, frost damage prevention, and ultraviolet rays. Weather resistance such as wind, rain and acid rain
It is a kind of effect. The material constituting the permanent buried formwork for concrete of the present invention, cement and fibers, as this cement, including ordinary Portland cement, early strength Portland cement, Portland cement such as ultra early strength Portland cement, blast furnace cement. Any mixture of silica cement, mixed cement such as fly ash cement, and alumina cement may be used.

【0015】また繊維としては、ワラストナイト、石綿
等の無機繊維、パルプ等の天然有機繊維又は合成繊維等
が挙げられ、更に具体的には天然有機繊維として、NB
Kパルプ、LBKパルプ、木綿パルプ、麻パルプ等のパ
ルプ、木粉、鋸屑、コルク粉、各種繊維等が挙げられ、
合成繊維としては、塩化ビニル、ナイロン、ポリアミ
ド、ポリエステル、ポリウレタン、ビニロン、ポリエチ
レン、アラミド繊維、炭素繊維等が挙げられる。これら
の繊維は、任意の長さで用いてもよいが、好ましくは1
mm〜20mmの長さのものがよく、更には2mm〜1
0mmの長さのものがよい。また繊維の直径は、0.0
01mm〜2mmが好ましい。
Examples of the fibers include inorganic fibers such as wollastonite and asbestos, natural organic fibers such as pulp and synthetic fibers, and more specifically, the natural organic fibers include NB.
K pulp, LBK pulp, cotton pulp, hemp pulp and other pulp, wood powder, sawdust, cork powder, various fibers, and the like,
Examples of synthetic fibers include vinyl chloride, nylon, polyamide, polyester, polyurethane, vinylon, polyethylene, aramid fiber, and carbon fiber. These fibers may be used in any length, but preferably 1
mm to 20 mm long is preferable, and further 2 mm to 1
A length of 0 mm is preferable. The fiber diameter is 0.0
01 mm to 2 mm is preferable.

【0016】また本発明に用いられるセメントと繊維と
の比率は、セメント80重量%〜99重量%と繊維20
重量%〜1重量%とからなり、好ましくはセメント85
重量%〜98重量%と繊維15重量%〜2重量%とから
なる。セメントが80重量%未満では強度に欠けるので
好ましくなく、セメントが99重量%を越えても強度の
増加はなく経済的に不利である。また繊維が繊維1重量
%未満では補強効果が余りなく、20重量%を越えると
かえって強度が低下する。更に本発明に用いられるセメ
ントと繊維の混練物を形成する際に用いられる水の量
は、該混練物100重量部に対して水10重量部〜55
重量部が好ましく、また得られた埋設型枠の水セメント
比は、通常の水セメント比でよいが、好ましくは水セメ
ント比で15%〜50%である。
The ratio of cement to fiber used in the present invention is 80% to 99% by weight of cement and 20% of fiber.
Wt% to 1 wt%, preferably cement 85
% To 98% by weight and 15% to 2% by weight of fibers. If the amount of cement is less than 80% by weight, the strength is insufficient, which is not preferable. If the amount of cement exceeds 99% by weight, the strength is not increased and it is economically disadvantageous. If the fiber content is less than 1% by weight, the reinforcing effect is not so great, and if it exceeds 20% by weight, the strength is rather lowered. Further, the amount of water used in forming the kneaded product of the cement and the fibers used in the present invention is 10 parts by weight to 55 parts by weight of water based on 100 parts by weight of the kneaded product.
The parts by weight are preferable, and the water-cement ratio of the obtained buried form may be a normal water-cement ratio, but the water-cement ratio is preferably 15% to 50%.

【0017】本発明のコンクリート用永久埋設型枠は、
10%〜25%の気孔率と8MPa以上の曲げ強度を有
するもので、この範囲の気孔率を有することによりコン
クリートを打設すると、コンクリートの成分がこの気孔
中に流入し、該型枠と打設コンクリートとが一体化さ
れ、かつ余剰水が吸収されて高強度となり、更に耐候性
に優れたものが得られる。したがって気孔率が10%未
満の場合には、水分を含むコンクリートの成分が十分流
入しないので、型枠の性能が不十分となり、また気孔率
が25%を越えると型枠の成分素材が少なくなるので、
十分な耐久性が得られない。また本発明において形成さ
れる気孔乃至細孔の大きさは、直径10Å〜2,500
Åが好ましい。更に本発明のコンクリート用永久埋設型
枠では、8MPa以上、好ましくは8MPa〜45MP
aの曲げ強度を有する場合に、好ましい埋設型枠が得ら
れる。
The permanent buried formwork for concrete of the present invention is
It has a porosity of 10% to 25% and a bending strength of 8 MPa or more, and when pouring concrete by having a porosity in this range, the components of the concrete flow into the porosity, and the concrete form It is possible to obtain the one that is integrated with the installed concrete, absorbs excess water, has high strength, and has excellent weather resistance. Therefore, when the porosity is less than 10%, the components of the concrete containing water do not sufficiently flow in, so that the performance of the form becomes insufficient, and when the porosity exceeds 25%, the component material of the form becomes small. So
Sufficient durability cannot be obtained. The size of the pores or pores formed in the present invention is 10 Å to 2,500 in diameter.
Å is preferred. Furthermore, in the permanent buried formwork for concrete of the present invention, 8 MPa or more, preferably 8 MPa to 45 MP
A preferred buried form is obtained when it has a bending strength of a.

【0018】本発明のコンクリート用永久埋設型枠は、
任意の形状のものが製造されるが、特に打設コンクリー
トと接する面は、平面でも凹凸を有していてもよいが、
好ましくは凹凸を有するのがよい。型枠が凹凸を有する
場合には、この凹部に打設コンクリート用鉄筋を配置す
るのがよい。また該凹凸の形状としては、波型、ジグザ
グ型、富士山型、コの字型等が挙げられる。凹部と凸部
とが対称形であっても非対称形であってもよく、更にこ
れらの形状を組み合わせたものでもよい。本発明に用い
られる型枠素材には、砂、砂利等の骨材を加えることが
でき、更に必要に応じて従来この技術分野においてよく
知られている添加物乃至混和材料を加えることができ
る。
The permanent buried formwork for concrete of the present invention is
Although any shape is manufactured, the surface in contact with the cast concrete may have a flat surface or unevenness,
It is preferable to have unevenness. When the formwork has irregularities, it is preferable to place the reinforcing bars for the cast concrete in the depressions. Examples of the shape of the unevenness include a corrugated shape, a zigzag shape, a Mt. Fuji shape, and a U-shape. The concave portion and the convex portion may be symmetrical or asymmetrical, or may be a combination of these shapes. Aggregates such as sand and gravel can be added to the mold material used in the present invention, and if necessary, additives or admixtures well known in the art can be added.

【0019】本発明のコンクリート用永久埋設型枠は、
この技術分野において通常用いられる製造方法で製造す
ることができ、例えば型枠素材であるセメントと繊維と
を混合した後、水を加えて十分混練して均一な混練物と
する。この混練時間は比較的短くてよく、2分〜15分
で十分な混練物が得られる。その後、該混練物を成形型
枠に注入して成形するか、または押出し成形して、任意
の形状の埋設型枠を形成する。更に得られた埋設型枠は
好ましくは養生する。養生としては、蒸気養生でもオー
トクレーブ養生でもよい。
The permanent buried formwork for concrete of the present invention comprises
It can be manufactured by a manufacturing method usually used in this technical field. For example, after cement and a fiber, which are mold material, are mixed, water is added and sufficiently kneaded to obtain a uniform kneaded product. This kneading time may be relatively short and a sufficient kneaded product can be obtained in 2 to 15 minutes. Then, the kneaded product is poured into a molding mold for molding or extrusion molding to form an embedded mold having an arbitrary shape. Furthermore, the buried formwork obtained is preferably cured. The curing may be steam curing or autoclave curing.

【0020】[0020]

【作用】本発明では、セメントと繊維との混練物からな
り、しかも気孔率が10%〜25%であり、かつ曲げ強
度が8MPa以上という条件を満たす埋設型枠としたこ
とにより、コンクリートを打設した後、型枠とコンクリ
ート間で一体化されて高強度のコンクリート構造物が得
られる。この一体化は、型枠内部に打設したコンクリー
トから水酸化カルシウムを含んだ余剰水が吸収され、型
枠に形成されている細孔内に水酸化カルシウムが吸着さ
れ、空隙を埋める作用をするものと考えられる。しかし
てこのようにして得られた緻密化された型枠は、吸水性
が減少し、外部からの水分、塩素、炭酸ガス等の環境性
雰囲気から遮断されてコンクリートが保護される。また
打設コンクリートは、余剰水が吸収されるので、水セメ
ント比が低減され、高耐久性が得られる。
In the present invention, concrete is cast by using an embedded formwork which is made of a kneaded material of cement and fibers, has a porosity of 10% to 25% and a bending strength of 8 MPa or more. After installation, the formwork and concrete are integrated to obtain a high-strength concrete structure. This integration functions to absorb excess water containing calcium hydroxide from the concrete placed inside the formwork, adsorb calcium hydroxide in the pores formed in the formwork, and fill voids. It is considered to be a thing. However, the densified formwork thus obtained has a reduced water absorption property and is protected from the external environmental atmosphere such as moisture, chlorine, carbon dioxide, etc. to protect the concrete. Further, since the surplus water is absorbed in the cast concrete, the water-cement ratio is reduced and high durability is obtained.

【0021】[0021]

【実施例】以下、本発明の実施例を挙げて更に詳しく説
明するが、本発明は、この例によって限定されるもので
はない。
EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

【0022】実施例1 図1の部分斜視図で示される埋設型枠を製造し、これを
用いてコンクリートを打設し、コンクリート構造物を形
成した。図1において、埋設型枠1は、該埋設型枠1の
裏面に凸部11と凹部12を有するものである。型枠用
混練物は、セメント77重量%、繊維(カーボン繊維
(ピッチ系)、直径0.0145mm、長さ10mm、
アスペクト比690)2.7重量%、水27重量%及び
メチルセルロース(増粘剤)1.3重量%を調製し、6
分間混練し、均一な混練物を得た。ついでこの混練物か
らなる型枠用素材を押出成形機を用いて押出し成形して
巾300mm、厚み(凸部まで)25mm、長さ3,0
00mmの埋設型枠1を製造した。このようにして得ら
れた埋設型枠1は、耐候性及び強度の優れ、高耐久性で
あった。
Example 1 A buried formwork shown in the partial perspective view of FIG. 1 was manufactured, and concrete was poured using this to form a concrete structure. In FIG. 1, the embedded formwork 1 has a convex portion 11 and a recessed portion 12 on the back surface of the embedded formwork 1. The kneaded product for formwork is 77% by weight of cement, fiber (carbon fiber (pitch type), diameter 0.0145 mm, length 10 mm,
Aspect ratio 690) 2.7% by weight, water 27% by weight and methylcellulose (thickener) 1.3% by weight were prepared, 6
Kneading was performed for a minute to obtain a uniform kneaded product. Then, a material for a mold made of this kneaded product is extruded and molded using an extrusion molding machine to obtain a width of 300 mm, a thickness (up to a convex portion) of 25 mm, and a length of 3,0
A 00 mm buried formwork 1 was produced. The buried formwork 1 thus obtained was excellent in weather resistance and strength and had high durability.

【0023】実施例2 実施例1において、型枠用混練物として、セメント51
重量%、砂26重量%、繊維(カーボン繊維(ピッチ
系)、直径0.0145mm、長さ10mm、アスペク
ト比690)2.0重量%、水20重量%及びメチルセ
ルロース(増粘剤)1重量%の混練物を用いた以外は、
実施例1と同様にして巾300mm、厚み(凸部まで)
25mm、長さ3,000mmの埋設型枠1を製造し
た。
Example 2 In Example 1, cement 51 was used as a kneaded material for formwork.
Wt%, sand 26 wt%, fiber (carbon fiber (pitch type), diameter 0.0145 mm, length 10 mm, aspect ratio 690) 2.0 wt%, water 20 wt% and methylcellulose (thickener) 1 wt% Except that the kneaded product of
Similar to Example 1, width 300 mm, thickness (up to convex portion)
An embedded mold 1 having a length of 25 mm and a length of 3,000 mm was manufactured.

【0024】このようにして得られた埋設型枠1を使用
して図2の部分斜視図に示される如く、コンクリート2
を打設してコンクリート構造物の試供品を作製した。こ
の際鉄筋3は埋設型枠1の凹部12とコンクリート2の
外面側に配置した。この試供品を用いて耐久性の試験を
し、その結果を表1に示した。比較例としては、コンク
リート製型枠を用い、この型枠にコンクリートを打設し
てコンクリート構造物を形成した。また強度はシュミッ
トハンマーの反発係数より求めた。
As shown in the partial perspective view of FIG. 2, using the buried formwork 1 thus obtained, concrete 2
Was cast to prepare a sample of a concrete structure. At this time, the reinforcing bars 3 were arranged on the concave portion 12 of the buried form 1 and on the outer surface side of the concrete 2. A durability test was conducted using this sample, and the results are shown in Table 1. As a comparative example, a concrete mold was used, and concrete was cast into this mold to form a concrete structure. The strength was calculated from the coefficient of restitution of the Schmidt hammer.

【0025】[0025]

【表1】 [Table 1]

【0026】表1から明らかなように、本発明において
は、曲げ強度に優れており、コクリート構造物の強度も
比較例のものに比較して優れていると共に耐候性もよ
い。
As is clear from Table 1, in the present invention, the flexural strength is excellent, the strength of the cocrete structure is superior to that of the comparative example, and the weather resistance is also good.

【0027】[0027]

【発明の効果】本発明の埋設型枠は、セメントと繊維と
の混練物からなり、しかも気孔率が10%〜25%であ
り、かつ曲げ強度が8MPa以上という条件を満たす埋
設型枠としたことにより、耐候性に優れたコンクリート
用永久埋設型枠が得られ、この埋設型枠を用いてコンク
リートを打設したコンクリート構造物は、型枠とコンク
リート間が一体化されて高強度かつ耐候性に優れた高耐
久性のコンクリート構造物が得られるという格別顕著な
効果を奏するものである。
The buried form of the present invention comprises a kneaded product of cement and fibers, and has a porosity of 10% to 25% and a bending strength of 8 MPa or more. By doing so, a permanent buried formwork for concrete with excellent weather resistance can be obtained, and a concrete structure in which concrete is cast using this buried formwork has a high strength and weather resistance due to the integration between the formwork and concrete. It has a particularly remarkable effect that a highly durable concrete structure having excellent properties can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明のコンクリート用永久埋設型枠を示す部
分斜視図である。
FIG. 1 is a partial perspective view showing a permanent buried formwork for concrete of the present invention.

【図2】本発明のコンクリート用永久埋設型枠を使用し
たコンクリート構造物を示す部分斜視図である。
FIG. 2 is a partial perspective view showing a concrete structure using the permanent buried formwork for concrete of the present invention.

【符号の説明】[Explanation of symbols]

1 埋設型枠 2 打設コンクリート 11 凹部 3 鉄筋 12 凸部 1 Embedded formwork 2 Casting concrete 11 Recessed portion 3 Reinforcing bar 12 Convex portion

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 C04B 28/02 40/02 E04B 1/16 C 7121−2E //(C04B 28/02 14:38 Z 16:02 Z 16:06) Z (72)発明者 河原 幸則 埼玉県大宮市北袋町一丁目297番地 三菱 マテリアル株式会社セメント研究所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location C04B 28/02 40/02 E04B 1/16 C 7121-2E // (C04B 28/02 14:38 Z 16:02 Z 16:06) Z (72) Inventor Yukinori Kawahara 1-297 Kitabukurocho, Omiya City, Saitama Prefecture Mitsubishi Materials Corporation Cement Research Institute

Claims (7)

【特許請求の範囲】[Claims] 【請求項1】 10%〜25%の気孔率と8MPa以上
の曲げ強度を有するコンクリート用永久埋設型枠であっ
て、型枠素材がセメント及び繊維からなり、前記埋設型
枠は打設コンクリートと一体化されることを特徴とする
コンクリート用永久埋設型枠。
1. A permanent buried formwork for concrete having a porosity of 10% to 25% and a bending strength of 8 MPa or more, wherein the formwork material is cement and fiber, and the buried formwork is cast concrete. Permanent buried formwork for concrete, characterized by being integrated.
【請求項2】 型枠素材に砂が添加されていることを特
徴とする請求項1に記載のコンクリート用永久埋設型
枠。
2. The permanent buried formwork for concrete according to claim 1, wherein sand is added to the formwork material.
【請求項3】 曲げ強度が8MPa〜45MPaである
ことを特徴とする請求項1又は請求項2のいづれかに記
載のコンクリート用永久埋設型枠。
3. The permanent buried formwork for concrete according to claim 1, wherein the bending strength is 8 MPa to 45 MPa.
【請求項4】 セメント80重量%〜99重量%と繊維
20重量%〜1重量%とからなることを特徴とする請求
項1乃至請求項3のいづれかに記載のコンクリート用永
久埋設型枠。
4. The permanent buried formwork for concrete according to any one of claims 1 to 3, which comprises 80% by weight to 99% by weight of cement and 20% by weight to 1% by weight of fibers.
【請求項5】 繊維が無機系天然繊維、有機系天然繊維
又は合成繊維から選ばれた少なくとも1種以上であるこ
とを特徴とする請求項1乃至請求項4のいづれかに記載
のコンクリート用永久埋設型枠。
5. The permanent embedding for concrete according to claim 1, wherein the fiber is at least one selected from inorganic natural fiber, organic natural fiber and synthetic fiber. Formwork.
【請求項6】 型枠裏面が凹凸状に形成されていること
を特徴とする請求項1乃至請求項5のいづれかに記載の
コンクリート用永久埋設型枠。
6. The permanent buried formwork for concrete according to claim 1, wherein the back face of the formwork is formed in an uneven shape.
【請求項7】 請求項1乃至請求項6のいづれかに記載
のコンクリート用永久埋設型枠と打設コンクリートから
なるコンクリート構造物。
7. A concrete structure comprising the permanent buried formwork for concrete according to any one of claims 1 to 6 and cast concrete.
JP34688193A 1993-12-27 1993-12-27 Permanently embedded formwork for highly durable concrete Withdrawn JPH07189379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34688193A JPH07189379A (en) 1993-12-27 1993-12-27 Permanently embedded formwork for highly durable concrete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34688193A JPH07189379A (en) 1993-12-27 1993-12-27 Permanently embedded formwork for highly durable concrete

Publications (1)

Publication Number Publication Date
JPH07189379A true JPH07189379A (en) 1995-07-28

Family

ID=18386457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34688193A Withdrawn JPH07189379A (en) 1993-12-27 1993-12-27 Permanently embedded formwork for highly durable concrete

Country Status (1)

Country Link
JP (1) JPH07189379A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008038515A (en) * 2006-08-08 2008-02-21 Nihon Samicon Co Ltd Board for form
JP2009114625A (en) * 2007-11-01 2009-05-28 Nihon Samicon Co Ltd Embedded board for placing joint

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008038515A (en) * 2006-08-08 2008-02-21 Nihon Samicon Co Ltd Board for form
JP4605546B2 (en) * 2006-08-08 2011-01-05 日本サミコン株式会社 Formwork board
JP2009114625A (en) * 2007-11-01 2009-05-28 Nihon Samicon Co Ltd Embedded board for placing joint

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