JP4526634B2 - Method for manufacturing concrete structure - Google Patents
Method for manufacturing concrete structure Download PDFInfo
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- JP4526634B2 JP4526634B2 JP2000025311A JP2000025311A JP4526634B2 JP 4526634 B2 JP4526634 B2 JP 4526634B2 JP 2000025311 A JP2000025311 A JP 2000025311A JP 2000025311 A JP2000025311 A JP 2000025311A JP 4526634 B2 JP4526634 B2 JP 4526634B2
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- Prior art keywords
- concrete
- flow
- mortar
- discharge opening
- lower discharge
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【0001】
【発明の属する技術分野】
本発明はコンクリート構造物の製造方法に関する。
【0002】
【従来の技術】
セメント類を含む水硬性構造物の表面に文字や図形などの装飾を施す方法として、硬化遅延剤を含浸させた紙やシートを所定の形状に切断し、型枠内面の所定部位に接着させ、コンクリートを打設する方法がある。この方法では、シート部分は硬化が遅延することから、脱型後の水洗浄などで未硬化のコンクリートを容易に除去でき、コンクリート表面に立体的な模様が形成される(特開昭58−166004号)。
【0003】
【発明が解決しようとする課題】
しかしながら、従来、コンクリートの打設から硬化に至る過程で、分離するセメントペーストやブリージング水により、硬化遅延剤が溶出し、文字や図形が精度良く形成されないことがあった。
【0004】
【課題を解決するための手段】
本発明は、硬化遅延剤を含むシートを所望の形状にして張り付けた型枠に、下記方法により測定された流下時間が10〜30秒且つJIS R5201 10.7フロー試験の方法(ただしタッピングは行わず、テーブル台は700mm×700mmを使用)により測定されたフロー値が250〜350mmのモルタルを含むコンクリートを打設する工程を有するコンクリート構造物の製造方法を提供する。
<流下時間の測定方法>
直径100mmの上部投入開口と、直径20mmの下部排出開口とを有する先細形状を備え、長さが300mmの筒(材質はステンレス鋼)からなる装置に、下部排出開口を閉じた状態でモルタルを上部投入開口まで充填した後、下部排出開口を開いてモルタルを流下させ、流下が終了するまでの時間(秒)を測定する。
【0005】
【発明の実施の形態】
本発明において、硬化遅延剤及びこれを含むシートは公知のものが使用される。硬化遅延剤としては、酸化亜鉛、酸化鉛、ケイフッ化マグネシウム、トリポリリン酸ナトリウム等の無機系遅延剤、オキシカルボン酸、ジカルボン酸、脂肪酸、糖アルコール、糖質などの有機系遅延剤が挙げられる(「セメント・コンクリート化学とその応用」セメント協会、昭和62年8月発行、第88頁、図3)。
【0006】
また、硬化遅延剤を含むシートとしては、紙、ポリエステルフィルム等(特開昭63−216703号、特開平9−183643号)が挙げられる。また、硬化遅延剤を含むシート自体が加水分解されて遅延効果を発現するようなものでもよい。
【0007】
本発明では、上記のような硬化遅延剤を含むシートを、文字、図形等所望の形状に加工して型枠の所定の部位に設置し、これに特定物性のモルタルを含むコンクリートを打設する。その後、養生、脱型し、シートを除去して水洗等で未硬化コンクリートを除去するが、これらの工程は常法に準ずる。
【0008】
本発明に用いられるコンクリートは、上記の通り、特定方法により測定される流下時間が10〜30秒、好ましくは10〜25秒、特に好ましくは11〜20秒で、フロー値が250〜350mm、好ましくは280〜320mmのモルタルを含む。この範囲の流下時間とフロー値を満たすことにより、充填性がよくペーストや水の分離が少なくなる。モルタルの流下時間は、図1に示す上部投入開口1が内径100mm、下部排出開口2が内径20mm、長さLが300mmの先細形状の筒(材質はステンレス鋼)からなる装置を用いて測定される。図1(a)は該容器の側部からの概略図、(b)は平面からの概略図である。図1の容器は適当な支持手段で固定され、下部排出開口2をゴム栓や板等で閉じた状態でモルタルを充填し、上部投入開口1の面で擦り切った後、下部排出開口2を開放してモルタルを自然流下させ、流下が終了するまでの時間を測定する。なお、本発明において、流下の終了とは、上部投入開口から目視で観察したときにモルタルの少なくとも一部に孔が確認される状態を言う。
【0009】
流下時間の調節には微粉末や水溶性高分子が用いられる。微粉末としては、高炉スラグ、フライアッシュ、炭酸カルシウム、シリカヒューム、珪石粉、石灰石粉等が挙げられ、好ましくは高炉スラグ、石灰石粉である。また、水溶性高分子としては、メチルセルロース、エチルセルロース、ヒドロキシメチルセルロース等のセルロース誘導体、ポリエチレンオキサイド、ポリアクリル酸塩、ポリアクリルアミド、ポリビニルアルコール、多糖類誘導体(特開平3−285857号、特開平11−1355号等の多糖類)や特開平7−82251号の水溶性高分子が挙げられ、好ましくはセルロース誘導体である。流下時間と流動性の両立の観点から、微粉末は、セメント+微粉末の量が400〜650kg/m3、特に450〜550kg/m3となるように用いることが好ましい。その際、微粉末の量は50〜300kg/m3、特に100〜250kg/m3が好ましい。また、水溶性高分子の量は、水に対して0.001〜5重量%、特に0.05〜2重量%が好ましい。この範囲の微粉末量あるいは水溶性高分子量であると、粘性が適正化され、分散剤の使用量がいたずらに増加しないので好ましい。
【0010】
また、フロー値の調整には分散剤が用いられる。分散剤としては、リグニンスルホン酸塩や高性能減水剤として使用されるナフタレン系、メラミン系、ポリカルボン酸系、ポリエーテル系等が挙げられ、好ましくはポリエーテル系である(コンクリート総覧:技術書院、1998年6月10日、第128〜130頁、高性能減水剤、高性能AE減水剤の欄参照のこと。)。分散剤の添加量は、セメントと微粉末の合計に対して、0.05〜2重量%が好ましい。
【0011】
本発明の対象となるコンクリートは、セメント類、細骨材、粗骨材を主成分とするものであるが、各種の添加剤(材)を使用することもでき、モルタル物性が所定範囲であればよい。一例を挙げれば、AE剤、遅延剤、消泡剤、気泡剤、防水剤、防腐剤、各種セメント類等が挙げられる。
【0012】
更にコンクリートは、気泡(軽量)コンクリート、重量コンクリート、防水コンクリート及びモルタル等であり、限定されるものではない。
【0013】
【発明の効果】
本発明によれば、文字や図形を精度良く形成できるコンクリート構造物の製造方法が提供される。
【0014】
【実施例】
実施例1
(1)コンクリートの調製
表1に示す成分により、表1に示す物性を有するモルタルを含有するコンクリートを調製した。モルタル物性の評価は、前記コンクリートを目開き5mmの篩で篩い分けして得たモルタルを用いて、下記の方法で行った。
▲1▼モルタルフロー
JIS R5201 9.7フロー試験の方法(ただしタッピングは行わず、テーブル台は700mm×700mmを使用)に準じる。
▲2▼流下時間
図1に示す先細形状の筒(材質はステンレス鋼)からなる装置に、下部排出開口1を閉じた状態でモルタルを上部投入開口まで充填し、上部投入開口1の面で擦り切った後、下部排出開口2を開放してモルタルを自然流下させ、上部投入開口1から目視で観察したときにモルタルの少なくとも一部に孔が確認されるまでの時間(秒)を測定した。
【0015】
(2)造形精度の評価
箱形型枠(縦×横×高さ=300×300×300mm)の内面の立ち上がり部分の中央に、直径10cmの硬化遅延剤シート(定量紙(No.40、5B、直径10cm、化学共栄社製)を3%サッカロース水溶液に浸漬し、50℃で1時間乾燥させたもの。)を、両面テープで接着する。この型枠に、表1に示すコンクリートを投入し、24時間後に脱型し、水洗浄でシートと未硬化部分を洗い流した。得られたコンクリート構造物のシート部分に形成された円形の凹部の直径を直交する2方向について測定し、下記の基準で評価した。結果を表1に示す。
◎…2方向とも直径が10cm以上10.3cm以下
○…2方向とも直径が10.3cm超10.5cm以下
×…何れかの直径が10.5cm超
××…コンクリートの充填不足で空隙が多い
【0016】
【表1】
【0017】
(注)
MCの配合量はWに対する重量%であり、M−1、M−2の配合量はC+SL+CAに対する重量%である。また、表1中の各成分は下記の通りである。
W:水道水
C:普通ポルトランドセメント(太平洋社製)比重3.16
SL:高炉スラグ(エスメント4000、新日本化学社製)
CA:石灰石微粉末(ネオフロー、清水工業社製)
S:君津産陸砂 比重2.58
G:和歌山産砕石 比重2.60
MC:メチルセルロース(ダイセル1170、ダイセル化学工業社製)
M−1:マイティ150(花王(株)製、ナフタレン系高性能減水剤)
M−2:マイティ3000S(花王(株)製、ポリエーテル系高性能減水剤)
【図面の簡単な説明】
【図1】モルタルの流下時間の測定に用いられる装置の概略図
【符号の説明】
1…上部投入開口
2…下部排出開口[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a concrete structure.
[0002]
[Prior art]
As a method of decorating the surface of a hydraulic structure containing cement, such as letters and figures, cut a paper or sheet impregnated with a curing retarder into a predetermined shape, and adhere it to a predetermined part on the inner surface of the mold, There is a method of placing concrete. In this method, since the curing of the sheet portion is delayed, the uncured concrete can be easily removed by washing with water after demolding, and a three-dimensional pattern is formed on the concrete surface (Japanese Patent Laid-Open No. 58-166004). issue).
[0003]
[Problems to be solved by the invention]
However, conventionally, in the process from placing concrete to hardening, the curing retarder is eluted by the cement paste and the breathing water to be separated, and characters and figures are not formed with high accuracy.
[0004]
[Means for Solving the Problems]
According to the present invention, a flow test time measured by the following method is 10 to 30 seconds and a JIS R5201 10.7 flow test method (however, tapping is performed) In addition, the present invention provides a method for producing a concrete structure having a step of placing concrete containing mortar having a flow value of 250 to 350 mm as measured by a table base using 700 mm × 700 mm.
<Measurement method of flow time>
A mortar with a lower discharge opening closed in a device with a tapered shape having a top input opening with a diameter of 100 mm and a lower discharge opening with a diameter of 20 mm and a length of 300 mm (material is stainless steel) After filling to the input opening, the lower discharge opening is opened to allow the mortar to flow down, and the time (seconds) until the flow ends is measured.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, known curing retarders and sheets containing the same are used. Examples of the retarder include inorganic retarders such as zinc oxide, lead oxide, magnesium fluorosilicate, and sodium tripolyphosphate, and organic retarders such as oxycarboxylic acid, dicarboxylic acid, fatty acid, sugar alcohol, and saccharide ( "Cement and concrete chemistry and its application", Cement Association, August 1987, page 88, Fig. 3).
[0006]
Examples of the sheet containing a curing retarder include paper, polyester film and the like (Japanese Patent Laid-Open Nos. 63-216703 and 9-183643). Moreover, the sheet itself containing a curing retarder may be hydrolyzed to exhibit a retarding effect.
[0007]
In the present invention, a sheet containing a curing retarder as described above is processed into a desired shape such as letters and figures and placed in a predetermined part of a formwork, and concrete containing mortar having specific physical properties is placed thereon. . Thereafter, curing, demolding, removing the sheet and removing uncured concrete by washing with water, etc., these steps are in accordance with ordinary methods.
[0008]
As described above, the concrete used in the present invention has a flow time measured by a specific method of 10 to 30 seconds, preferably 10 to 25 seconds, particularly preferably 11 to 20 seconds, and a flow value of 250 to 350 mm, preferably Contains 280-320 mm mortar. By satisfying the flow time and flow value in this range, the filling property is good and the separation of paste and water is reduced. The flow time of the mortar is measured using an apparatus comprising a tapered tube (material is stainless steel) having an inner diameter of 100 mm, an
[0009]
Fine powder and water-soluble polymer are used to adjust the flow time. Examples of the fine powder include blast furnace slag, fly ash, calcium carbonate, silica fume, silica stone powder, limestone powder, and the like, preferably blast furnace slag and limestone powder. Examples of water-soluble polymers include cellulose derivatives such as methyl cellulose, ethyl cellulose, and hydroxymethyl cellulose, polyethylene oxide, polyacrylate, polyacrylamide, polyvinyl alcohol, and polysaccharide derivatives (Japanese Patent Laid-Open Nos. 3-285857 and 11-1355). And water-soluble polymers described in JP-A-7-82251, preferably cellulose derivatives. From the viewpoint of achieving both flow-down time and fluidity, the fine powder is preferably used so that the amount of cement + fine powder is 400 to 650 kg / m 3 , particularly 450 to 550 kg / m 3 . At that time, the amount of fine powder is preferably 50 to 300 kg / m 3 , particularly preferably 100 to 250 kg / m 3 . The amount of the water-soluble polymer is preferably 0.001 to 5% by weight, particularly 0.05 to 2% by weight, based on water. A fine powder amount or a water-soluble high molecular weight within this range is preferable because the viscosity is optimized and the amount of dispersant used does not increase unnecessarily.
[0010]
A dispersant is used for adjusting the flow value. Examples of the dispersant include lignin sulfonate and naphthalene-based, melamine-based, polycarboxylic acid-based, polyether-based, which are used as high-performance water reducing agents, and are preferably polyether-based (Concrete Directory: Technical Library) , June 10, 1998, pp. 128-130, high water reducing agent, high performance AE water reducing agent column.) The amount of the dispersant added is preferably 0.05 to 2% by weight based on the total amount of cement and fine powder.
[0011]
The concrete which is the object of the present invention is mainly composed of cements, fine aggregates and coarse aggregates, but various additives (materials) can be used and the mortar properties are within a predetermined range. That's fine. For example, AE agent, retarder, antifoaming agent, foaming agent, waterproofing agent, preservative, various cements and the like can be mentioned.
[0012]
Furthermore, the concrete is cellular (lightweight) concrete, heavy concrete, waterproof concrete, mortar and the like, and is not limited.
[0013]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the concrete structure which can form a character and a figure accurately is provided.
[0014]
【Example】
Example 1
(1) Preparation of concrete Concrete containing mortar having physical properties shown in Table 1 was prepared using the components shown in Table 1. The mortar properties were evaluated by the following method using mortar obtained by sieving the concrete with a 5 mm sieve.
(1) Mortar flow According to JIS R5201 9.7 flow test method (however, tapping is not performed and the table table uses 700 mm × 700 mm).
(2) Flowing time The apparatus consisting of the tapered tube (made of stainless steel) shown in FIG. 1 is filled with mortar up to the upper inlet opening with the lower outlet opening 1 closed, and rubbed on the surface of the upper inlet opening 1 After cutting, the
[0015]
(2) Evaluation of modeling accuracy In the center of the rising portion of the inner surface of the box formwork (vertical x horizontal x height = 300 x 300 x 300 mm), a curing retarder sheet (quantitative paper (No. 40, 5B) having a diameter of 10 cm is provided. , 10 cm in diameter, manufactured by Chemical Kyoei Co., Ltd.) is immersed in a 3% aqueous saccharose solution and dried at 50 ° C. for 1 hour. The concrete shown in Table 1 was put into this mold, and it was demolded after 24 hours, and the sheet and the uncured portion were washed away with water. The diameter of the circular recessed part formed in the sheet | seat part of the obtained concrete structure was measured about two orthogonal directions, and the following reference | standard evaluated. The results are shown in Table 1.
◎ ... Diameter is 10cm or more and 10.3cm or less in both directions ○ Diameter is more than 10.3cm and less than 10.5cm in both directions ×… Any diameter is more than 10.5cm XX… There are many voids due to insufficient filling of concrete [0016]
[Table 1]
[0017]
(note)
The blending amount of MC is wt% with respect to W, and the blending amounts of M-1 and M-2 are wt% with respect to C + SL + CA. Moreover, each component in Table 1 is as follows.
W: Tap water C: Normal Portland cement (manufactured by Taiheiyo Co., Ltd.) specific gravity 3.16
SL: Blast furnace slag (ESMENT 4000, manufactured by Shin Nippon Chemical Co., Ltd.)
CA: Limestone fine powder (Neoflow, manufactured by Shimizu Corporation)
S: Land sand from Kimitsu 2.58 specific gravity
G: Wakayama crushed stone, specific gravity 2.60
MC: methylcellulose (Daicel 1170, manufactured by Daicel Chemical Industries)
M-1: Mighty 150 (manufactured by Kao Corporation, naphthalene-based high-performance water reducing agent)
M-2: Mighty 3000S (manufactured by Kao Corporation, polyether high-performance water reducing agent)
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an apparatus used for measuring the flow time of mortar.
1 ... Upper input opening 2 ... Lower discharge opening
Claims (2)
<流下時間の測定方法>
直径100mmの上部投入開口と、直径20mmの下部排出開口とを有する先細形状を備え、長さが300mmの筒(材質はステンレス鋼)からなる装置に、下部排出開口を閉じた状態でモルタルを上部投入開口まで充填した後、下部排出開口を開いてモルタルを流下させ、流下が終了するまでの時間(秒)を測定する。The flow time measured by the following method is 10 to 30 seconds and a JIS R5201 10.7 flow test method (however, no tapping is performed, and a table stand Has a step of placing concrete containing mortar having a flow value of 250 to 350 mm measured by (using 700 mm × 700 mm), and a step of removing uncured concrete by removing the sheet after curing and demolding A method for manufacturing a concrete structure.
<Measurement method of flow time>
A mortar with a lower discharge opening closed in a device with a tapered shape having a top input opening with a diameter of 100 mm and a lower discharge opening with a diameter of 20 mm and a length of 300 mm (material is stainless steel) After filling to the input opening, the lower discharge opening is opened to allow the mortar to flow down, and the time (seconds) until the flow ends is measured.
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JP2000025311A JP4526634B2 (en) | 2000-02-02 | 2000-02-02 | Method for manufacturing concrete structure |
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JP2000025311A JP4526634B2 (en) | 2000-02-02 | 2000-02-02 | Method for manufacturing concrete structure |
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JP4526634B2 true JP4526634B2 (en) | 2010-08-18 |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58166004A (en) * | 1982-03-29 | 1983-10-01 | 株式会社鍋島興産 | Manufacture of wash-out plate with joint and its formwork |
JPH04163105A (en) * | 1990-10-26 | 1992-06-08 | Mitsubishi Materials Corp | Manufacture of decoratively finished block |
JPH09254122A (en) * | 1996-03-26 | 1997-09-30 | Mishima Seishi Kk | Hydraulic cement material setting retarding sheet |
-
2000
- 2000-02-02 JP JP2000025311A patent/JP4526634B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58166004A (en) * | 1982-03-29 | 1983-10-01 | 株式会社鍋島興産 | Manufacture of wash-out plate with joint and its formwork |
JPH04163105A (en) * | 1990-10-26 | 1992-06-08 | Mitsubishi Materials Corp | Manufacture of decoratively finished block |
JPH09254122A (en) * | 1996-03-26 | 1997-09-30 | Mishima Seishi Kk | Hydraulic cement material setting retarding sheet |
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