JPH08143382A - Production of concrete for vegetation and precast concrete for vegetation - Google Patents

Production of concrete for vegetation and precast concrete for vegetation

Info

Publication number
JPH08143382A
JPH08143382A JP28059694A JP28059694A JPH08143382A JP H08143382 A JPH08143382 A JP H08143382A JP 28059694 A JP28059694 A JP 28059694A JP 28059694 A JP28059694 A JP 28059694A JP H08143382 A JPH08143382 A JP H08143382A
Authority
JP
Japan
Prior art keywords
concrete
vegetation
cement
water
gaseous
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.)
Granted
Application number
JP28059694A
Other languages
Japanese (ja)
Other versions
JP3489887B2 (en
Inventor
Kosei Tatekawa
孝生 竪川
Shigeyuki Sogo
茂幸 十河
Norihiko Miura
律彦 三浦
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.)
Obayashi Corp
Original Assignee
Obayashi 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 Obayashi Corp filed Critical Obayashi Corp
Priority to JP28059694A priority Critical patent/JP3489887B2/en
Publication of JPH08143382A publication Critical patent/JPH08143382A/en
Application granted granted Critical
Publication of JP3489887B2 publication Critical patent/JP3489887B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00758—Uses not provided for elsewhere in C04B2111/00 for agri-, sylvi- or piscicultural or cattle-breeding applications

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Retaining Walls (AREA)
  • Porous Artificial Stone Or Porous Ceramic Products (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PURPOSE: To produce a concrete for vegetation and a precast concrete for vegetation suitable to plant propagation by kneading cement, aggregate, water and frothing agent in a gaseous CO2 atmosphere to neutralize an alkali content in the concrete with carbonic acid. CONSTITUTION: A low alkali cement, aggregate, water and frothing agent are kneaded in the gaseous CO2 atmosphere to obtain an aerated concrete for vegetation, and alkali content such as Ca(OH)2 generated by a hydration reaction of the cement is neutralized with the CO2 and adjusted to pH5-9.5 which is a suitable liq. quality range for a plant growing. A neutralization by using the gaseous CO2 can be executed in the process of kneading and/or in the process of aging, and an accomplishment of an object is possible by using a calcareous water instead of the gaseous CO2 atmosphere, and by aging an aging pot under gaseous CO2 high concn. environment in the case of a cast concrete.

Description

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

【０００１】[0001]

【産業上の利用分野】この発明は、コンクリート中のア
ルカリ分を炭酸により中和することにより、植物の繁殖
に好適な植生用コンクリート及び植生用プレキャストコ
ンクリートの製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing vegetation concrete and vegetation precast concrete suitable for propagating plants by neutralizing alkali in concrete with carbonic acid.

【０００２】[0002]

【従来の技術】意図的にコンクリートを土の代わりとし
てその表面に植物を植栽できるようにすれば、意匠的な
工夫も可能となり、環境問題にも対応できる。このよう
に、コンクリートに直接植物を栽培するためにはコンク
リートに土壌と同じ機能を与える必要がある。2. Description of the Related Art If concrete is intentionally used as a substitute for soil so that plants can be planted on the surface of the concrete, it is possible to design it and deal with environmental problems. Thus, in order to grow plants directly on concrete, it is necessary to give concrete the same function as soil.

【０００３】ところが、従来一般に用いられているコン
クリートは高いアルカリ性を示し、また根張り空間や発
芽空間が少なく、含水量が小さく、透水性，保水性に乏
しい上、植物の育成に必要な栄養分が含まれておらず、
植物の育成用として適合しない。このため、従来ではコ
ンクリートの表層に土壌或いは土壌条件に類似する不織
布等の植生基盤層を設置した複合構造体を形成し、その
表面に植栽を施すことが提案されていた。However, conventionally used concrete has a high alkalinity, has little rooting space and germination space, has a small water content, is poor in water permeability and water retention, and has nutrients necessary for growing plants. Not included,
Not suitable for growing plants. For this reason, conventionally, it has been proposed to form a composite structure in which a vegetation base layer such as soil or a nonwoven fabric similar to soil conditions is installed on the surface layer of concrete and to plant the surface thereof.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、この種
の複合化は施工に際して労力の負担となり、コストアッ
プにつながるとともに、植生基盤層の厚み等によって植
物の根張りが制限され、育成種が限定される問題があっ
た。また、垂直ないし急勾配斜面などでは雨水などによ
る育成用基盤層の表面流失や剥落，崩壊等により、植生
を施すことは難しかった。However, this type of compounding requires a labor burden during construction and leads to an increase in cost, and the rooting of plants is limited due to the thickness of the vegetation base layer and the breeding species are limited. There was a problem. In addition, it was difficult to apply vegetation on vertical or steep slopes due to surface runoff, exfoliation, and collapse of the growing base layer due to rainwater.

【０００５】この発明は以上の着眼点に基づきなされた
ものであって、その目的は、コンクリートを予め人為的
に中性化しておくことにより、コンクリート自体を植物
育成に好適な液性とし、また十分な根張り空間を形成で
きるようにした植生用コンクリート及び植生用プレキャ
ストコンクリートの製造方法を提供するものである。The present invention has been made on the basis of the above-mentioned points of view, and its purpose is to artificially neutralize concrete in advance so that the concrete itself has a liquid property suitable for growing plants, and It is intended to provide a method for producing vegetation concrete and vegetation precast concrete capable of forming a sufficient rooting space.

【０００６】[0006]

【課題を解決するための手段】前記目的を達成するため
に、本発明にかかる植生用コンクリートは、セメント、
骨材、水、起泡剤を炭酸ガス雰囲気中で混練してなる
か、セメント、骨材、炭酸水あるいはドライアイスを混
練してなることを特徴とするものである。In order to achieve the above-mentioned object, concrete for vegetation according to the present invention comprises cement,
It is characterized by being formed by kneading aggregate, water and a foaming agent in a carbon dioxide atmosphere, or by kneading cement, aggregate, carbonated water or dry ice.

【０００７】また、本発明にかかる植生用プレキャスト
コンクリートの製造方法は、セメント、骨材、水を混練
し、型枠内に打設して硬化・脱型した後、炭酸水中或い
は炭酸ガス中で所定期間養生することを特徴とする。Further, the method for producing precast concrete for vegetation according to the present invention is such that cement, aggregate and water are kneaded, placed in a mold to cure and demold, and then in carbonated water or carbon dioxide. Characterized by curing for a predetermined period.

【０００８】[0008]

【作用】以上の構成によれば、セメントの水和反応によ
って生成されるＣａ（ＯＨ）2等のアルカリ成分は、Ｃ
Ｏ2 により中和され、液性を植生に好適な範囲に調整す
る。また、起泡剤によって発生したガスは一部炭酸ガス
に置換されて、所定の空隙率の連続気泡形コンクリート
が得られ、この空隙は植物の根張りのための保水，保肥
空間としてそのまま利用される。According to the above construction, the alkaline component such as Ca (OH) 2 produced by the hydration reaction of cement is C
It is neutralized with O 2 and the liquidity is adjusted to a range suitable for vegetation. In addition, the gas generated by the foaming agent is partially replaced with carbon dioxide gas to obtain open-cell concrete with a specified porosity, and this void is used as it is as a water-retaining and fertilizing space for rooting plants. To be done.

【０００９】[0009]

【実施例】以下この発明を構造物に埋め殺される植生用
の気泡ＰＣ（プレキャストコンクリート）版に適用した
実施例について詳細に説明する。なお、一般に気泡ＰＣ
版の製造工程は、気泡コンクリート材料の計量、混練、
型枠への打設、養生、脱型の手順でなされる。各工程に
おいて、この発明による炭酸ガスによる中和は、混練過
程か養生過程、或いはその双方の過程で行なうことがで
きる。以下、気泡コンクリートを構成するセメント、骨
材、起泡剤等の各種材料、これを用いた製造方法、得ら
れたＰＣ版の使用時における経時変化について順に説明
する。EXAMPLE An example in which the present invention is applied to a cellular PC (precast concrete) plate for vegetation to be buried in a structure will be described in detail below. Generally, bubble PC
The plate manufacturing process consists of measuring, kneading and mixing aerated concrete materials.
It is done by the steps of casting on the formwork, curing, and demolding. In each step, the neutralization with carbon dioxide according to the present invention can be performed in the kneading process, the curing process, or both processes. Hereinafter, various materials such as cement, aggregate, foaming agent, etc. that constitute cellular concrete, a manufacturing method using the same, and a change with time of using the obtained PC plate will be sequentially described.

【００１０】［気泡コンクリート材料］ セメント：低アルカリのセメント・混和剤が好まし
い。より具体的なセメントとしては例えばフライアッシ
ュ，高炉スラグなどの低アルカリセメント単体、ないし
はこれらの混合物、さらにはこれにポリマーを混合した
組成物等いずれのものも使用可能である。また、混和剤
としては高性能ＡＥ減水剤等がある。また、水／セメン
ト比は、２０〜３５％程度とすることが好ましい。[Aerated Concrete Material] Cement: A low-alkali cement / admixture is preferred. As more specific cement, for example, low alkali cement simple substance such as fly ash or blast furnace slag, or a mixture thereof, or a composition in which a polymer is mixed can be used. Further, as the admixture, there is a high performance AE water reducing agent and the like. Further, the water / cement ratio is preferably about 20 to 35%.

【００１１】骨材：粗骨材および細骨材があり、いず
れも一般には砕石または軽量骨材を主とするものである
が、本発明では細骨材のみを用い、特に粒径０．３〜
０．６mmの細骨材を増量させたものを用いることが好ま
しい。Aggregate: There are coarse aggregate and fine aggregate, both of which are generally mainly crushed stone or lightweight aggregate, but in the present invention, only fine aggregate is used, and the particle size is especially 0.3. ~
It is preferable to use an increased amount of fine aggregate of 0.6 mm.

【００１２】起泡剤：空隙率３０〜４０％の気泡量を
安定的に得るのに十分な起泡剤量とし、また発生した気
泡の散逸を防止するために増粘剤を併用する。具体的な
起泡剤としては、動物性たん白質界面活性剤があり、増
粘剤としては水溶性セルロースエーテル，アクリル系高
分子がある。Foaming agent: An amount of foaming agent sufficient to stably obtain an amount of bubbles having a porosity of 30 to 40%, and a thickening agent is also used in order to prevent dissipation of the generated bubbles. Specific foaming agents include animal protein surfactants, and thickeners include water-soluble cellulose ethers and acrylic polymers.

【００１３】［製造方法］ 混練、打設：以上の材料と水とを計量し、ミキサ内に
順次投入しつつ混練するが、混練時或いは混練後で水和
反応が始まった後の所定時間において混練物の外部を炭
酸ガス雰囲気とすることによってフレッシュコンクリー
トを中和させることができる。したがって、セメントの
水和反応によって生成されるＣａ（ＯＨ）2 等のアルカ
リ成分の一部はＣＯ2 により中和される。[Manufacturing Method] Kneading and Casting: The above materials and water are weighed and kneaded while being sequentially charged into a mixer, but at a predetermined time after kneading or after the hydration reaction starts after kneading. The fresh concrete can be neutralized by creating a carbon dioxide gas atmosphere outside the kneaded product. Therefore, a part of the alkaline component such as Ca (OH) 2 produced by the hydration reaction of cement is neutralized by CO 2 .

【００１４】混練後この混練物を型枠に打設する。必要
に応じて型枠内には予め格子状の防錆処理鉄筋あるいは
ＦＲＰ製補強材を定着させておく。型枠内において、起
泡剤によって発生したガスの一部は、投入された炭酸ガ
スに置換されて、所定の空隙率のままコンクリート内に
閉じ込められ、連続気泡形のコンクリートが型内成形さ
れる。After kneading, the kneaded product is placed in a mold. If necessary, grid-shaped rustproof reinforcing bars or FRP reinforcing materials are fixed in advance in the mold. In the mold, part of the gas generated by the foaming agent is replaced with the carbon dioxide gas that has been injected, and is confined in the concrete with a predetermined porosity, and the open-cell concrete is molded in the mold. .

【００１５】なお、この実施例では、炭酸ガス雰囲気と
する方法を採用したが、本発明の他の実施例として、水
の一部或いは全部を炭酸水に置換したり、炭酸ガスを混
練物中に直接吹き込む方法、またはドライアイスを投入
することもできる。In this embodiment, a method of using a carbon dioxide gas atmosphere was adopted, but as another embodiment of the present invention, part or all of water is replaced with carbonated water, or carbon dioxide gas is mixed in the kneaded product. It is also possible to directly blow into the ice, or to put dry ice.

【００１６】なお、混練，打設過程においては炭酸ガス
雰囲気とせず、以下の養生過程を炭酸ガス雰囲気中で行
なってもよい。It should be noted that the following curing process may be carried out in a carbon dioxide atmosphere instead of the carbon dioxide atmosphere in the kneading and casting processes.

【００１７】養生：材例３日程度までは標準水中養生
し、それ以降は弱炭酸水中で材齢７〜１４日程度まで養
生する。これによりＰＣ版の表面および気泡の内面には
炭酸カルシウムの層が徐々に浸透し、表面から中和化さ
れる。それ以降は大気中で自然乾燥させる。Curing: Material Example: Curing in standard water for up to about 3 days, and thereafter, in weak carbonated water for up to 7 to 14 days. As a result, the layer of calcium carbonate gradually penetrates into the surface of the PC plate and the inner surface of the bubbles, and is neutralized from the surface. After that, air dry in the atmosphere.

【００１８】また、他の方法として、コンクリートの圧
縮強度が５０Ｋgf／ｃｍ2 となったら、養生釜内で、Ｃ
Ｏ2 濃度５〜１００％、温度１０〜５０℃、相対湿度３
０〜８０％の炭酸ガス高濃度環境下で養生を行なえば、
Ｃａ（ＯＨ）2 と反応することで前記と同様その表面お
よび気泡の内面は炭酸カルシウムの層が徐々に浸透し、
表面から中和される。As another method, when the compressive strength of concrete reaches 50 Kgf / cm 2 , C in a curing pot is used.
O 2 concentration 5 to 100%, temperature 10 to 50 ° C, relative humidity 3
If you cure in a high carbon dioxide concentration environment of 0-80%,
By reacting with Ca (OH) 2 , the layer of calcium carbonate gradually penetrates into the surface and the inner surface of the bubbles as described above,
It is neutralized from the surface.

【００１９】養生後は、少くともＰＣ版のｐＨが５〜
８、多くとも９．５程度に設定することによって液性が
植生に好適な範囲に調整されることになる。After curing, the pH of the PC plate should be at least 5
The liquid property is adjusted to a range suitable for vegetation by setting it to 8, at most 9.5.

【００２０】脱型、後加工：養生処理を終えたＰＣ版
は型枠から脱型され、河川堤防の護岸，コンクリート構
造物の表面緑化等の用途に供されるＰＣ版として直接出
荷することができる。Demolding and post-processing: The PC plate that has been cured is demolded from the formwork and can be shipped directly as a PC plate that is used for revetment of river banks, greening the surface of concrete structures, etc. it can.

【００２１】また、ＰＣ版の空隙は植物の根張りのため
の保水，保肥空間としてそのまま利用されるので、脱型
後植物育成に必要な肥料を施肥したり、種子吹き付け、
種子含有土壌の塗り込め等の後加工を施した後、出荷す
ることもできる。この場合に肥料は連続気泡内部に十分
含浸し、気泡内は植物育成用空間として十分な栄養状態
に保持される。Further, since the voids of the PC plate are used as they are as water-retaining and fertilizing spaces for rooting the plants, fertilizer necessary for plant growth after demolding, seed spraying,
The seed-containing soil may be shipped after being subjected to post-processing such as coating. In this case, the fertilizer is sufficiently impregnated inside the open cells, and the inside of the cells is maintained in a sufficient nutritional state as a space for growing plants.

【００２２】［ＰＣ版使用時の経時変化］ＰＣ版を構造
物に組付けた後は、自然条件下での雨水等による表面流
失や剥落や崩壊はなく、当初強度に応じて自立性が長期
に亘って維持される。[Change with time during use of PC plate] After the PC plate was assembled to the structure, there was no surface runoff, peeling or collapse due to rainwater under natural conditions, and self-sustaining property for a long time depending on the initial strength. Maintained throughout.

【００２３】雨水供給に伴ない肥料が気泡内に溶出し、
寒暖や湿度，日照等の好適育成条件が整うと、種子が発
芽，発根し、ＰＣ版に形成された連続気泡内に根張りし
つつ成長する。Fertilizer elutes in the bubbles with the supply of rainwater,
When suitable growing conditions such as temperature, humidity, and sunshine are set, seeds germinate and root, and grow while rooting in the open cells formed on the PC plate.

【００２４】なお、上記実施例では、本発明をＰＣ版の
製造方法に適用した例を示したが、ＰＣ版の製造方法に
限らず、他の一般的な構造物、例えば場所打ちで行なう
河川堤防の護岸，建物屋上の植生緑化等に適用すること
ができることは勿論である。In the above embodiment, the present invention is applied to a method for manufacturing a PC plate, but the invention is not limited to the method for manufacturing a PC plate, and other general structures such as rivers cast by cast-in-place. Needless to say, it can be applied to revetment of levees and vegetation greening on the roof of buildings.

【００２５】[0025]

【発明の効果】以上実施例によって詳細に説明したよう
に、本発明にかかる植生用コンクリート及び植生用プレ
キャストコンクリートの製造方法にあっては、セメント
の水和反応によって生成されるＣａ（ＯＨ）2 等のアル
カリ成分は、ＣＯ2 により中和され、液性を植生に好適
な範囲に調整する。また、起泡剤によって発生したガス
は一部炭酸ガスに置換されて、所定の空隙率の連続気泡
形コンクリートが得られ、この空隙は植物の根張りのた
めの保水，保肥空間としてそのまま利用できるため、コ
ンクリートをそのまま植生に利用でき、植生のための複
合構造化をしなくてもよいので安価に製造できる利点が
あるほか、植生が育成されれば、コンクリート肌面が露
出した殺風景なものを自然に調和したものに変え、美し
い景観とすることができる利点がある。INDUSTRIAL APPLICABILITY As described in detail in the above examples, in the method for producing vegetation concrete and vegetation precast concrete according to the present invention, Ca (OH) 2 produced by the hydration reaction of cement is produced. Alkaline components such as are neutralized by CO 2 and adjust the liquidity to a range suitable for vegetation. In addition, the gas generated by the foaming agent is partially replaced with carbon dioxide gas to obtain open-cell concrete with a specified porosity, and this void is used as it is as a water-retaining and fertilizing space for rooting plants. As a result, concrete can be used as it is for vegetation, and there is an advantage that it can be manufactured at low cost because there is no need to make a composite structure for vegetation. Has the advantage that it can be transformed into something that is in harmony with nature to create a beautiful landscape.

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 セメント、骨材、水、起泡剤を炭酸ガス
雰囲気中で混練してなることを特徴とする植生用コンク
リート。1. A concrete for vegetation, which is obtained by kneading cement, aggregate, water and a foaming agent in a carbon dioxide atmosphere. 【請求項２】 セメント、骨材、炭酸水を混練してなる
ことを特徴とする植生用コンクリート。2. A vegetation concrete comprising a mixture of cement, aggregate and carbonated water. 【請求項３】 セメント、骨材、水を混練し、型枠内に
打設して硬化・脱型した後、炭酸水中或いは炭酸ガス中
で所定期間養生することを特徴とする植生用プレキャス
トコンクリートの製造方法。3. A precast concrete for vegetation characterized by being kneaded with cement, aggregate and water, cast in a mold to cure and demold, and then cured in carbonated water or carbon dioxide for a predetermined period. Manufacturing method.
JP28059694A 1994-11-15 1994-11-15 Method for producing concrete for vegetation and precast concrete for vegetation Expired - Fee Related JP3489887B2 (en)

Priority Applications (1)

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JP28059694A JP3489887B2 (en) 1994-11-15 1994-11-15 Method for producing concrete for vegetation and precast concrete for vegetation

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Application Number Priority Date Filing Date Title
JP28059694A JP3489887B2 (en) 1994-11-15 1994-11-15 Method for producing concrete for vegetation and precast concrete for vegetation

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JPH08143382A true JPH08143382A (en) 1996-06-04
JP3489887B2 JP3489887B2 (en) 2004-01-26

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000157094A (en) * 1998-11-27 2000-06-13 Nkk Corp Stone material for sinking and disposing in water and its production
JP2002293601A (en) * 2001-03-30 2002-10-09 Taiheiyo Cement Corp Production process of lightweight mortar material
JP2003104765A (en) * 2001-09-27 2003-04-09 Sumitomo Osaka Cement Co Ltd Porous concrete molding for planting and its manufacturing method
JP2004307257A (en) * 2003-04-07 2004-11-04 Toyo Constr Co Ltd Method of manufacturing shell recycled block and shell recycled block

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000157094A (en) * 1998-11-27 2000-06-13 Nkk Corp Stone material for sinking and disposing in water and its production
JP2002293601A (en) * 2001-03-30 2002-10-09 Taiheiyo Cement Corp Production process of lightweight mortar material
JP4658362B2 (en) * 2001-03-30 2011-03-23 太平洋セメント株式会社 Manufacturing method for lightweight mortar
JP2003104765A (en) * 2001-09-27 2003-04-09 Sumitomo Osaka Cement Co Ltd Porous concrete molding for planting and its manufacturing method
JP2004307257A (en) * 2003-04-07 2004-11-04 Toyo Constr Co Ltd Method of manufacturing shell recycled block and shell recycled block

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