JPH11349368A - Lightweight concrete for pressure-receiving precast platen and its production - Google Patents

Lightweight concrete for pressure-receiving precast platen and its production

Info

Publication number
JPH11349368A
JPH11349368A JP15924198A JP15924198A JPH11349368A JP H11349368 A JPH11349368 A JP H11349368A JP 15924198 A JP15924198 A JP 15924198A JP 15924198 A JP15924198 A JP 15924198A JP H11349368 A JPH11349368 A JP H11349368A
Authority
JP
Japan
Prior art keywords
lightweight
aggregate
concrete
water
reducing agent
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.)
Pending
Application number
JP15924198A
Other languages
Japanese (ja)
Inventor
Haruo Aoki
治雄 青木
Eitaro Yoshitomi
英太郎 吉冨
Masahiro Nakamura
正博 中村
Taku Kuwamoto
卓 桑本
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.)
Fujita Corp
Original Assignee
Fujita 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 Fujita Corp filed Critical Fujita Corp
Priority to JP15924198A priority Critical patent/JPH11349368A/en
Publication of JPH11349368A publication Critical patent/JPH11349368A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/302Water reducers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain lightweight concrete improved in lightness, strength, and resistance to freezing and thawing by blending a water reducing agent excellent in dispersibility in aggregate and various kinds of additives with a composition containing cement, water and lightweight aggregate partially or entirely dried. SOLUTION: This lightweight concrete is obtained by blending a water reducing agent excellent in dispersibility in aggregate and various kinds of additives with a composition containing cement, water, lightweight aggregate and aggregate. The lightweight aggregate comprises fine aggregate and coarse aggregate, and it is permissible that one of them is wet and the other is in bone dry but the total water absorption of both aggregates is pref. <=50%. When part or the whole of lightweight aggregate has <=1.0 specific gravity, the composition becomes further lighter. The ratio of water to cement is pref. <=55%. The water reducing agent is pref. polycarboxylic acid-based and e.g. a polycarboxylic acid ether-based complex (Ca base) or the like. The content of the water reducing agent is pref. ca. 0.6-9.0 L/1 m<3> . When a foaming agent as an additive is included in concrete so as to include bubbles in the concrete, it is possible to improve lightness, and resistance to freezing and thawing.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、軽量でかつ高強度
のプレキャスト受圧盤用のコンクリートおよびその製造
方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight and high-strength concrete for a precast pressure plate and a method for producing the same.

【0002】[0002]

【従来の技術】従来、プレキャスト受圧盤は、コンクリ
ート製であるために重く、揚重機の能力に制限を受け、
そのサイズを大きくすることができなかった。また軽量
骨材を用いてコンクリートを軽くすると、強度が低くな
り、耐凍結融解性も低くなるために、軽量コンクリート
製のプレキャスト受圧盤は実用性に乏しかった。
2. Description of the Related Art Conventionally, a precast pressure receiving plate is heavy because it is made of concrete, and the capacity of a lifting machine is limited.
The size could not be increased. Further, when the concrete is lightened by using the lightweight aggregate, the strength is reduced and the freeze-thaw resistance is also reduced, so that the precast pressure receiving plate made of the lightweight concrete is not practical.

【0003】従来、軽量コンクリートに配合される軽量
骨材は、使用前に含水させて湿潤状態にし、なお含水状
態を一定に保った上用いられために、硬化した後の軽量
コンクリートは強度も低く耐凍結融解性も低かった。
Conventionally, lightweight aggregates to be blended with lightweight concrete are hydrated by being hydrated before use, and are used after keeping the hydrated state constant. Therefore, the lightweight concrete after hardening has low strength. Freezing and thawing resistance was also low.

【0004】[0004]

【発明が解決しようとする課題】コンクリート製のプレ
キャスト受圧盤は、軽量で、高強度で、しかも高い耐凍
結融解性が望まれている。プレキャスト受圧盤の重量が
軽くなれば施工性も向上し、必要に応じてそのサイズも
従来より大きくすることもできる。
A concrete precast pressure plate is required to be lightweight, have high strength, and have high freeze-thaw resistance. When the weight of the precast pressure receiving plate is reduced, the workability is improved, and the size can be made larger than before if necessary.

【0005】したがって本発明の目的は、従来よりも軽
量性、強度、耐凍結融解性が改善したプレキャスト受圧
盤用軽量コンクリートおよびその製造方法を提供するこ
とにある。
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lightweight concrete for a precast pressure receiving board, which has improved lightness, strength and freeze-thaw resistance, and a method for producing the same.

【0006】[0006]

【課題を解決するための手段】本発明者らは、プレキャ
スト受圧盤用軽量コンクリートに含まれる材料として、
一部また全部が乾燥している軽量骨材および減水剤を用
いることで、上記の従来の課題を一気に解決できるとい
う驚くべき事実を見いだし、本発明を完成することがで
きた。
Means for Solving the Problems The present inventors have proposed a material contained in lightweight concrete for a precast pressure plate,
The present inventors have found the surprising fact that the above-mentioned conventional problems can be solved at a stretch by using a lightweight aggregate and a water reducing agent which are partially or entirely dried, and completed the present invention.

【0007】すなわち本発明は、セメント、水、一部ま
たは全部が乾燥している軽量骨材、該軽量骨材に対し分
散性の優れた減水剤、および必要に応じて各種添加材
(剤)を配合してなることを特徴とするプレキャスト受
圧盤用軽量コンクリートを提供するものである。また本
発明は、減水剤が、ポリカルボン酸系減水剤であること
を特徴とする前記のプレキャスト受圧盤用軽量コンクリ
ートを提供するものである。さらに本発明は、軽量骨材
が、絶乾状態ないし該軽量骨材の吸水率の半分程度まで
吸水していることを特徴とする前記のプレキャスト受圧
盤用軽量コンクリートを提供するものである。さらにま
た本発明は、比重が1.0未満の軽量骨材を一部または
全部として使用することを特徴とする前記のプレキャス
ト受圧盤用軽量コンクリートを提供するものである。ま
た本発明は、水セメント比を55%以下に設定すること
を特徴とする前記のプレキャスト受圧盤用軽量コンクリ
ートを提供するものである。さらに本発明は、起泡剤が
配合されてなる前記のプレキャスト受圧盤用軽量コンク
リートを提供するものである。さらにまた本発明は、S
iO2を主成分とする添加材(剤)が配合されてなる前
記のプレキャスト受圧盤用軽量コンクリートを提供する
ものである。また本発明は、増粘剤が配合されてなる前
記のプレキャスト受圧盤用軽量コンクリートを提供する
ものである。さらに本発明は、前記のプレキャスト受圧
盤用軽量コンクリートを、所望の形状の型枠内に打設す
ることを特徴とするプレキャスト受圧盤用軽量コンクリ
ートの製造方法を提供するものである。
That is, the present invention relates to a cement, water, a lightweight aggregate partially or entirely dried, a water reducing agent excellent in dispersibility to the lightweight aggregate, and various additives (agents) as required. The present invention provides a lightweight concrete for a precast pressure plate characterized by comprising: Further, the present invention provides the lightweight concrete for a precast pressure receiving plate, wherein the water reducing agent is a polycarboxylic acid-based water reducing agent. Further, the present invention provides the above-mentioned lightweight concrete for a precast pressure plate, wherein the lightweight aggregate absorbs water in a completely dry state or about half of the water absorption of the lightweight aggregate. Furthermore, the present invention provides the above-mentioned lightweight concrete for a precast pressure receiving plate, wherein a lightweight aggregate having a specific gravity of less than 1.0 is used as a part or the whole. Further, the present invention provides the lightweight concrete for a precast pressure receiving plate, wherein the water cement ratio is set to 55% or less. Further, the present invention provides the above-mentioned lightweight concrete for a precast pressure receiving plate, which comprises a foaming agent. Furthermore, the present invention relates to S
An object of the present invention is to provide the above-mentioned lightweight concrete for a precast pressure receiving plate, which comprises an additive (agent) containing iO 2 as a main component. The present invention also provides the above-mentioned lightweight concrete for a precast pressure plate, which comprises a thickener. Further, the present invention provides a method for manufacturing a lightweight concrete for a precast pressure plate, wherein the lightweight concrete for a precast pressure plate is cast in a form having a desired shape.

【0008】[0008]

【発明の実施の形態】従来、プレキャスト受圧盤に用い
たコンクリートの比重は2.3前後であり、重いもので
あった。本発明では、一部または全部が乾燥している軽
量骨材および減水剤を用いることにより、軽量性、強
度、耐凍結融解性が改善したプレキャスト受圧盤用軽量
コンクリートを提供することができる。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Conventionally, the specific gravity of concrete used for a precast pressure plate was around 2.3, which was heavy. In the present invention, a lightweight concrete for a precast pressure plate with improved lightness, strength, and freeze-thaw resistance can be provided by using a partially or entirely dried lightweight aggregate and a water reducing agent.

【0009】本発明に用いられる軽量骨材は、一部また
は全部が乾燥し、濡らす必要がなく、絶乾状態で用いる
ことができる。しかしながら、必要に応じて吸水率の半
分程度まで軽量骨材を濡らすこともできる。
[0009] The lightweight aggregate used in the present invention is partially or entirely dried and does not need to be wet, and can be used in a completely dry state. However, if desired, the lightweight aggregate can be wetted to about half the water absorption.

【0010】軽量骨材の種類としては、粗骨材および細
骨材共に限定されるものではなく、目的に応じて種々選
択することができる。例えば天然骨材と人工骨材とを併
用することもでき、具体的には細骨材として川砂を、粗
骨材として人工軽量粗骨材を用いたり、細骨材として人
工軽量細骨材を、粗骨材として天然軽量粗骨材(例えば
大島産)を用いることができる。本発明において、軽量
骨材は、細骨材または粗骨材の一方が湿潤状態で、他方
が絶乾状態であることもできるが、その場合でも両骨材
の全体の吸水率が50%以下であるのが好ましい。
The type of the lightweight aggregate is not limited to the coarse aggregate and the fine aggregate, and various types can be selected according to the purpose. For example, natural aggregates and artificial aggregates can be used in combination.Specifically, river sand is used as fine aggregate, artificial lightweight coarse aggregate is used as coarse aggregate, and artificial lightweight fine aggregate is used as fine aggregate. Natural coarse coarse aggregate (for example, from Oshima) can be used as the coarse aggregate. In the present invention, the lightweight aggregate may be such that one of the fine aggregate and the coarse aggregate is in a wet state and the other is in an absolutely dry state. Even in such a case, the total water absorption of both aggregates is 50% or less. It is preferred that

【0011】本発明で用いる軽量骨材は、その一部また
は全部が比重1.0未満のものから構成されていてもよ
い。これによりさらなる軽量化が達成される。
The lightweight aggregate used in the present invention may be partially or entirely made of a material having a specific gravity of less than 1.0. This achieves further weight savings.

【0012】本発明で用いるセメントは、とくに制限さ
れず用途により自由に選択でき、例えば普通ポルトラン
ドセメント、早強セメント、中庸熱セメント等を使用で
きる。また、ビーライトセメントも、高炉セメントも、
三成分セメント等も利用することができる。連続生産方
式で軽量ブロックを製造するには、早強セメント等の速
硬性セメントが好ましい。水セメント比は、通常16〜
60%、好ましくは55%以下の低い水セメント比が好
ましい。また必要に応じて各種添加材(剤)を配合でき
ることは言うまでもない。その他の配合率は、従来のそ
れと違わず、適宜決定できる。
The cement used in the present invention is not particularly limited and can be freely selected depending on the application. For example, ordinary Portland cement, early-strength cement, moderate heat cement and the like can be used. Also, belite cement, blast furnace cement,
Ternary cement and the like can also be used. In order to manufacture a lightweight block by a continuous production method, a quick-setting cement such as an early-strength cement is preferable. Water cement ratio is usually 16 ~
A low water cement ratio of 60%, preferably 55% or less is preferred. Needless to say, various additives (agents) can be added as needed. The other compounding ratios can be appropriately determined without being different from the conventional ones.

【0013】本発明に用いられる減水剤は、前記の乾燥
した軽量骨材に分散性が良好であればとくに制限されな
いが、ポリカルボン酸系の減水剤が好適に用いられる。
このポリカルボン酸系減水剤の具体例としては、主成分
がポリカルボン酸エーテル系の複合物(カルシウム・ベ
ース)等が挙げられる。市販されているものも好適に利
用することができ、例えば日本油脂社製の商品名マリア
リムA−20またはE−20、エヌエムビー社製の商品
名SP−8HE、花王社製の商品名マイテイ2000T
H等が挙げられる。その他の減水剤も利用することがで
きる。例えば、リグニン系、メラミン系、ナフタリン系
の減水剤を用いることができる。さらに言えば、主成分
が変性リグニン、アルキルアリールスルホン酸および活
性持続ポリマーの複合物である減水剤が挙げられ、市販
されているものとしては、例えばエヌエムビー社製の商
品名レオビルトSP−9HS、SP−9R等が利用でき
る。また、主成分が高縮合芳香族スルホン酸化合物であ
る減水剤が挙げられ、市販されているものとしては、例
えばエヌエムビー社製の商品名レオビルトNL−144
0等が利用できる。さらに、主成分がナフタリンスルホ
ン酸・ホルマリン高縮合物の減水剤が挙げられ、例えば
花王社製の商品名マイテイ150等が利用できる。
The water reducing agent used in the present invention is not particularly limited as long as it has good dispersibility in the above-mentioned dried lightweight aggregate, but a polycarboxylic acid-based water reducing agent is preferably used.
Specific examples of the polycarboxylic acid-based water reducing agent include a composite (calcium-based) whose main component is a polycarboxylic acid ether. Commercially available ones can also be suitably used, for example, Maria Rim A-20 or E-20 (trade name, manufactured by NOF Corporation, SP-8HE (trade name, manufactured by NMB Corporation), Mighty 2000T (trade name, manufactured by Kao Corporation)
H and the like. Other water reducing agents can also be used. For example, a lignin-based, melamine-based, or naphthalene-based water reducing agent can be used. Furthermore, a water reducing agent whose main component is a composite of modified lignin, alkylaryl sulfonic acid and an active-persisting polymer can be mentioned, and commercially available products include, for example, Rheobilt SP-9HS, SP manufactured by NMB Corporation. -9R etc. can be used. In addition, a water reducing agent whose main component is a highly condensed aromatic sulfonic acid compound may be mentioned, and commercially available products include, for example, Reobilt NL-144 (trade name, manufactured by NMB Corporation).
0 etc. can be used. Further, a water reducing agent whose main component is a naphthalenesulfonic acid / formalin highly condensed product may be mentioned, and for example, Kay Corporation's Mighty 150 or the like may be used.

【0014】減水剤の配合率は、採用されるセメント、
骨材の種類、水セメント比等によって適宜決定される
が、例えばコンクリート1m3に対し0.6〜9.0リ
ットル、好ましくは0.8〜6.0リットルがよい。
The mixing ratio of the water reducing agent depends on the cement used,
Type of aggregate, it is determined appropriately by the water-cement ratio, etc., for example, from 0.6 to 9.0 liters relative to the concrete 1 m 3, preferably from 0.8 to 6.0 liters.

【0015】本発明では、起泡剤をコンクリートに配合
して気泡を含有させれば、さらなる軽量化および耐凍結
融解性を高めることができ好ましいものとなる。使用す
る起泡剤としては、はとくに制限されない。例えば、起
泡剤としてエヌエムビー社製の商品名ファインフォーム
606、竹本油脂(株)の商品名起泡剤エアーセット
A、(株)セルフォーム技術研究所社製の商品名セルフ
ォームL−50等が挙げられる。その他の起泡剤も利用
することができる。
In the present invention, it is preferable to add a foaming agent to the concrete so as to contain air bubbles, since the weight and the freeze-thaw resistance can be further improved. The foaming agent used is not particularly limited. For example, as a foaming agent, Finefoam 606 (trade name, manufactured by NMB Corporation), a foaming agent Air Set A (trade name, manufactured by Takemoto Yushi Co., Ltd.), Cell Form L-50 (trade name, manufactured by Cell Form Engineering Laboratory Co., Ltd.), etc. Is mentioned. Other foaming agents can also be used.

【0016】本発明における起泡剤の投入量は、配合さ
れる材料の種類により異なり、一概に決定できないが、
例えば気泡が10〜350リットル/m3、好ましくは
50〜150リットル/m3となるように起泡剤を投入
するのがよい。気泡の大きさは、直径として10〜50
0μm、好ましくは20〜250μmがよい。
The amount of the foaming agent used in the present invention depends on the type of the material to be compounded, and cannot be unconditionally determined.
For example, a foaming agent is preferably introduced so that bubbles are 10 to 350 l / m 3 , preferably 50 to 150 l / m 3 . The size of the bubble is 10 to 50 in diameter.
0 μm, preferably 20 to 250 μm.

【0017】本発明においては、従来から公知の添加材
(剤)を配合することができる。例えば、SiO2を主
成分とする添加材(剤)が好適に使用される。具体例と
しては、シリカヒューム、例えばエルケムジャパン社製
の商品名マイクロシリカ、940U等が挙げられる。そ
のほか、必要に応じて高炉スラグ微粉末、天然岩石の微
粉末、人工セラミックの微粉末、フライアッシュ等も好
適に使用できる。また、ポゾラン反応をするものもしな
いものも利用できる。
In the present invention, conventionally known additives (agents) can be blended. For example, an additive (agent) containing SiO 2 as a main component is preferably used. As a specific example, silica fume, for example, Micro Silica, 940U manufactured by Elchem Japan Co., Ltd. may be mentioned. In addition, blast furnace slag fine powder, natural rock fine powder, artificial ceramic fine powder, fly ash, and the like can be suitably used as necessary. Further, those that do or do not cause a pozzolanic reaction can be used.

【0018】本発明において、長い運搬時間が予期され
る場合は、増粘剤を用いることができる。増粘剤として
は、例えばセルロース系の高流動コンクリート用増粘
剤、例えば信越化学社製の商品名SFCA2000(主
成分:セルロースエーテル、外観:白色粉末)が挙げら
れ、増粘剤の配合割合は、例えばコンクリート1m3
対し0.4〜0.8リットルである。
In the present invention, if a long transport time is expected, a thickener can be used. Examples of the thickener include cellulose-based thickeners for high-fluidity concrete, for example, SFCA2000 (product name: cellulose ether, appearance: white powder) manufactured by Shin-Etsu Chemical Co., Ltd. For example, 0.4 to 0.8 liter per 1 m 3 of concrete.

【0019】本発明のプレキャスト受圧盤用軽量コンク
リートは、従来の軽量コンクリートと同様に、ミキサー
中に材料を投入してから練りを行い、調合水および減水
剤、さらにその他の材料を投入し、本練りを行うことで
得られる。また本発明のプレキャスト受圧盤用軽量コン
クリートは、これを所望の形状の型枠に打設し、硬化さ
せることにより得られる。養生も、従来のそれと同様の
手段を採用でき、例えば蒸気養生を行うことができる。
養生によってひび割れ等の悪影響が発現することはな
い。
The light-weight concrete for a precast pressure receiving board of the present invention, like the conventional light-weight concrete, mixes the materials into a mixer and then kneads them, and then mixes the mixed water, a water reducing agent, and other materials into the mixer. It is obtained by kneading. Further, the lightweight concrete for a precast pressure receiving plate of the present invention is obtained by casting it into a mold having a desired shape and curing it. For curing, the same means as the conventional one can be adopted, and for example, steam curing can be performed.
Curing does not cause adverse effects such as cracks.

【0020】[0020]

【実施例】以下、本発明を実施例によって説明する。 (実施例1)下記表1に示す配合率に従って本発明のコ
ンクリートを調製した。なお、表1において、人工軽量
細骨材及び人工軽量粗骨材は、日本メサライト工業社
製、商品名メサライトであり、絶乾状態で用いた。減水
剤は、ポリカルボン酸系減水剤であり、絶乾状態の
(株)サンライト社製、商品名Gライトであり、減水剤
は、ポリカルボン酸系減水剤であり、エヌエムビー社
製、商品名SP−8HEである。
The present invention will be described below with reference to examples. (Example 1) Concrete according to the present invention was prepared according to the mixing ratios shown in Table 1 below. In Table 1, the artificial lightweight fine aggregate and the artificial lightweight coarse aggregate are Mesalite (trade name, manufactured by Nippon Mesalite Industry Co., Ltd.), and used in an absolutely dry state. The water reducing agent is a polycarboxylic acid-based water reducing agent, a brand name G light, manufactured by Sunlight Co., Ltd. in a completely dry state, and the water reducing agent is a polycarboxylic acid-based water reducing agent, manufactured by NMB Co., Ltd. The name is SP-8HE.

【0021】[0021]

【表1】 上記配合率に従って、各材料をミキサー中へ投入してか
ら練りを行い、調合水及び減水剤を投入し、本練りを行
い、本発明のコンクリートを調製した。
[Table 1] According to the above mixing ratios, each material was put into a mixer, kneaded, and then mixed water and a water reducing agent were charged, followed by main kneading to prepare a concrete of the present invention.

【0022】得られたコンクリートに対し、生コンクリ
ート時の打設10分後の物性を測定した。結果を下記表
2に示す。
The physical properties of the obtained concrete were measured 10 minutes after pouring in fresh concrete. The results are shown in Table 2 below.

【0023】[0023]

【表2】 さらに、上記の生コンクリートを規定の型枠に打設し、
φ10×20cmの寸法の供試体を得て、その圧縮強度
を測定した。その結果を表3に示す。
[Table 2] Furthermore, the above ready-mixed concrete is poured into the prescribed formwork,
A specimen having a size of φ10 × 20 cm was obtained, and its compressive strength was measured. Table 3 shows the results.

【0024】[0024]

【表3】 さらに、上記の生コンクリートを規定の型枠に打設し、
10×10×40cmの寸法の供試体を得て、ASTM
C666A法(水中凍結、水中融解)の試験方法によ
り凍結融解抵抗性を測定した。その結果を表4に示す。
[Table 3] Furthermore, the above ready-mixed concrete is poured into the prescribed formwork,
Obtain a specimen with dimensions of 10 × 10 × 40 cm, and use ASTM
The freeze-thaw resistance was measured by the test method of the C666A method (freezing in water, thawing in water). Table 4 shows the results.

【0025】[0025]

【表4】 (実施例2)下記表5に示す配合率に従って本発明のコ
ンクリートを調製した。表5において、人工軽量細骨材
および人工軽量粗骨材は、絶乾状態の日本メサライト工
業社製、商品名メサライトである。スーパーメサライト
の絶乾比重は1.3未満である。比重1.0未満の骨材
としては、秩父小野田社製の商品名マイクロセルズを用
いた。減水剤はポリカルボン酸系減水剤であり、花王株
式会社製の商品名マイテイ2000WHZを用いた。ま
た、添加材として、エルケムジャパン社製の商品名マイ
クロシリカを用いた。
[Table 4] (Example 2) Concrete according to the present invention was prepared in accordance with the mixing ratio shown in Table 5 below. In Table 5, the artificial lightweight fine aggregate and the artificial lightweight coarse aggregate are mesalite manufactured by Nippon Mesalite Industry Co., Ltd. in a completely dry state. The absolute dry gravity of Super Mesalite is less than 1.3. Microcells (trade name, manufactured by Chichibu Onoda Co., Ltd.) was used as the aggregate having a specific gravity of less than 1.0. The water reducing agent was a polycarboxylic acid-based water reducing agent, and a product name “Mighty 2000WHZ” manufactured by Kao Corporation was used. In addition, micro silica manufactured by Elchem Japan Co., Ltd. was used as an additive.

【0026】[0026]

【表5】 上記配合率に従って、各材料をミキサー中へ投入してか
ら練りを行い、調合水及び減水剤を投入し、本練りを行
い、本発明のコンクリートを調製した。
[Table 5] According to the above mixing ratios, each material was put into a mixer, kneaded, and then mixed water and a water reducing agent were charged, followed by main kneading to prepare a concrete of the present invention.

【0027】得られたコンクリートの生コンクリート時
の打設20分後および30分後の物性を測定した。本発
明のコンクリートは、30分後にスランプの変化が生じ
たが、作業性は十分であった。結果を表6に示す。
The physical properties of the obtained concrete were measured 20 minutes and 30 minutes after placing in the ready-mixed concrete. In the concrete of the present invention, the slump changed after 30 minutes, but the workability was sufficient. Table 6 shows the results.

【0028】[0028]

【表6】 さらに、上記生コンクリートを規定の型枠に打設し、φ
10×20cmの寸法の供試体を得て、その圧縮強度を
測定した。その結果を表7に示す。
[Table 6] Furthermore, the above ready-mixed concrete is poured into a prescribed formwork, and φ
A specimen having a size of 10 × 20 cm was obtained, and its compressive strength was measured. Table 7 shows the results.

【0029】[0029]

【表7】 (実施例3)下記表8に示す配合率に従って本発明のコ
ンクリートを調製した。表8において、人工軽量細骨材
および人工軽量粗骨材は、絶乾状態の日本セメント社
製、商品名アサノライトであり、減水剤は、ポリカルボ
ン酸系減水剤であり、エヌエムビー社製、商品名8HE
である。アサノライトの絶乾比重は1.3未満である。
比重1.0未満の骨材としては、秩父小野田社製の商品
名マイクロセルズを用いた。また、添加材として、シリ
カとして、エルケムジャパン社製の商品名940Uを用
いた。
[Table 7] (Example 3) Concrete according to the present invention was prepared according to the mixing ratios shown in Table 8 below. In Table 8, the artificial lightweight fine aggregate and the artificial lightweight coarse aggregate were manufactured by Nippon Cement Co., Ltd. under the trade name of Asanolite, and the water reducing agent was a polycarboxylic acid-based water reducing agent, manufactured by NMB Corporation. Product name 8HE
It is. The absolute specific gravity of asanolite is less than 1.3.
Microcells (trade name, manufactured by Chichibu Onoda Co., Ltd.) was used as the aggregate having a specific gravity of less than 1.0. As an additive, 940 U (trade name, manufactured by Elchem Japan Ltd.) was used as silica.

【0030】[0030]

【表8】 上記配合率に従って、各材料をミキサー中へ投入してか
ら練りを行い、調合水及び減水剤を投入し、本練りを行
い、本発明のコンクリートを調製した。
[Table 8] According to the above mixing ratios, each material was put into a mixer, kneaded, and then mixed water and a water reducing agent were charged, followed by main kneading to prepare a concrete of the present invention.

【0031】得られたコンクリートの生コンクリート時
の打設20分後および30分後の物性を測定した。本発
明のコンクリートは、30分後にスランプの変化が生じ
たが、作業性は十分であった。結果を表9に示す。
The physical properties of the obtained concrete were measured 20 minutes and 30 minutes after placing in the ready-mixed concrete. In the concrete of the present invention, the slump changed after 30 minutes, but the workability was sufficient. Table 9 shows the results.

【0032】[0032]

【表9】 さらに、上記生生コンクリートを規定の型枠に打設し、
φ10×20cmの寸法の供試体を得て、その圧縮強度
を測定した。その結果を表10に示す。
[Table 9] Further, the ready-mixed concrete is poured into a prescribed formwork,
A specimen having a size of φ10 × 20 cm was obtained, and its compressive strength was measured. Table 10 shows the results.

【0033】[0033]

【表10】 また、表1と表4のコンクリートに増粘剤、すなわち信
越化学工業社製の商品名SFCA2000を0.5リッ
トル/m3配合した。両方ともに、打設60分後まで、
スランプロスが見られなかった。なお圧縮強度は材齢2
8日で、5%以上増進した。コンクリートの気乾比重に
おいては同等であった。
[Table 10] Further, a thickener, that is, SFCA2000 (trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) was added to the concretes in Tables 1 and 4 at 0.5 L / m 3 . In both cases, until 60 minutes after casting
Slump loss was not seen. The compressive strength is age 2
On the 8th, it improved more than 5%. The air-dry specific gravity of concrete was equivalent.

【0034】[0034]

【発明の効果】上記実施例から分かるように、本発明の
コンクリートは、比重を考慮すると強度が高い。とくに
よき強度が高い。また、本発明のコンクリートは耐凍結
融解性等に基づく耐久性に優れている。また、本発明の
コンクリートは軽いので、同じ重量ならば、従来のもの
よりもサイズを大きくすることができる。このように本
発明によれば、従来よりも軽量性、強度、耐凍結融解性
が改善したプレキャスト受圧盤用軽量コンクリートおよ
びその製造方法が提供される。
As can be seen from the above examples, the concrete of the present invention has high strength in consideration of the specific gravity. Especially high strength. Further, the concrete of the present invention is excellent in durability based on freeze-thaw resistance and the like. Further, since the concrete of the present invention is light, the size can be made larger than that of the conventional one if the weight is the same. As described above, according to the present invention, there is provided a lightweight concrete for a precast pressure receiving board, which has improved lightness, strength, and freeze-thaw resistance, and a method for manufacturing the same.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 桑本 卓 東京都渋谷区千駄ヶ谷四丁目6番15号 株 式会社フジタ内 ──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Taku Kuwamoto 4-6-15 Sendagaya, Shibuya-ku, Tokyo Inside Fujita Co., Ltd.

Claims (9)

【特許請求の範囲】[Claims] 【請求項1】 セメント、水、一部または全部が乾燥し
ている軽量骨材、該軽量骨材に対し分散性の優れた減水
剤、および必要に応じて各種添加材(剤)を配合してな
ることを特徴とするプレキャスト受圧盤用軽量コンクリ
ート。
1. A lightweight aggregate in which cement or water, a part or all of which is dried, a water reducing agent having excellent dispersibility with respect to the lightweight aggregate, and various additives (agents) as required. Lightweight concrete for precast pressure plates characterized by the following:
【請求項2】 減水剤が、ポリカルボン酸系減水剤であ
ることを特徴とする請求項1に記載のプレキャスト受圧
盤用軽量コンクリート。
2. The lightweight concrete for a precast pressure plate according to claim 1, wherein the water reducing agent is a polycarboxylic acid-based water reducing agent.
【請求項3】 軽量骨材が、絶乾状態ないし該軽量骨材
の吸水率の半分程度まで吸水していることを特徴とする
請求項1または2に記載のプレキャスト受圧盤用軽量コ
ンクリート。
3. The lightweight concrete for a precast pressure plate according to claim 1, wherein the lightweight aggregate absorbs water in a completely dry state or about half of a water absorption rate of the lightweight aggregate.
【請求項4】 比重が1.0未満の軽量骨材を一部また
は全部として使用することを特徴とする請求項1ないし
3のいずれか1項に記載のプレキャスト受圧盤用軽量コ
ンクリート。
4. The lightweight concrete for a precast pressure receiving panel according to claim 1, wherein a lightweight aggregate having a specific gravity of less than 1.0 is used as a part or the whole.
【請求項5】 水セメント比を55%以下に設定するこ
とを特徴とする請求項1ないし4のいずれか1項に記載
のプレキャスト受圧盤用軽量コンクリート。
5. The lightweight concrete for a precast pressure receiving panel according to claim 1, wherein a water cement ratio is set to 55% or less.
【請求項6】 起泡剤が配合されてなる請求項1ないし
5のいずれか1項に記載のプレキャスト受圧盤用軽量コ
ンクリート。
6. The lightweight concrete for a precast pressure receiving panel according to any one of claims 1 to 5, further comprising a foaming agent.
【請求項7】 SiO2を主成分とする添加材(剤)が
配合されてなる請求項1ないし6のいずれか1項に記載
のプレキャスト受圧盤用軽量コンクリート。
7. The lightweight concrete for a precast pressure plate according to claim 1, further comprising an additive (agent) containing SiO 2 as a main component.
【請求項8】 増粘剤が配合されてなる請求項1ないし
7のいずれか1項に記載のプレキャスト受圧盤用軽量コ
ンクリート。
8. The lightweight concrete for a precast pressure plate according to claim 1, further comprising a thickener.
【請求項9】 請求項1ないし8のいずれか1項に記載
のプレキャスト受圧盤用軽量コンクリートを、所望の形
状の型枠内に打設することを特徴とするプレキャスト受
圧盤用軽量コンクリートの製造方法。
9. A method of manufacturing a lightweight concrete for a precast pressure plate, wherein the lightweight concrete for a precast pressure plate according to any one of claims 1 to 8 is cast into a formwork having a desired shape. Method.
JP15924198A 1998-06-08 1998-06-08 Lightweight concrete for pressure-receiving precast platen and its production Pending JPH11349368A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15924198A JPH11349368A (en) 1998-06-08 1998-06-08 Lightweight concrete for pressure-receiving precast platen and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15924198A JPH11349368A (en) 1998-06-08 1998-06-08 Lightweight concrete for pressure-receiving precast platen and its production

Publications (1)

Publication Number Publication Date
JPH11349368A true JPH11349368A (en) 1999-12-21

Family

ID=15689438

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15924198A Pending JPH11349368A (en) 1998-06-08 1998-06-08 Lightweight concrete for pressure-receiving precast platen and its production

Country Status (1)

Country Link
JP (1) JPH11349368A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009509900A (en) * 2005-09-29 2009-03-12 コンストラクション リサーチ アンド テクノロジー ゲーエムベーハー Use of polymer microparticles in building material mixtures

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009509900A (en) * 2005-09-29 2009-03-12 コンストラクション リサーチ アンド テクノロジー ゲーエムベーハー Use of polymer microparticles in building material mixtures

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