JP2015054806A - Carbonization curing method for concrete structure - Google Patents

Carbonization curing method for concrete structure Download PDF

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JP2015054806A
JP2015054806A JP2013190505A JP2013190505A JP2015054806A JP 2015054806 A JP2015054806 A JP 2015054806A JP 2013190505 A JP2013190505 A JP 2013190505A JP 2013190505 A JP2013190505 A JP 2013190505A JP 2015054806 A JP2015054806 A JP 2015054806A
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water storage
concrete
water
storage structure
curing method
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JP6204128B2 (en
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康祐 横関
Kosuke Yokozeki
康祐 横関
剛 取違
Takeshi Torii
剛 取違
彩永佳 木村
Saeka Kimura
彩永佳 木村
小林　聖
Kiyoshi Kobayashi
聖 小林
達徳 高柳
Tatsunori Takayanagi
達徳 高柳
健吾 関
Kengo Seki
健吾 関
渡邉　賢三
Kenzo Watanabe
賢三 渡邉
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Kajima Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an easily performable method for carbonization curing with a water storage structure made of concrete composed of a cement based cured body and having a water storage region capable of water storage as an object.SOLUTION: Provided is a carbonization curing method for a water storage structure 1 made of concrete having a water storage region 11 capable of water storage, and in which the inner wall face of the water storage region 11 is composed of a cement based cured body. The carbonization curing method for a water storage structure made of concrete includes: a pressure reduction step of making the water storage region 11 into a closed space and reducing the pressure in the space; and a water pouring step of pouring carbon dioxide dissolved water 2A into the water storage region 11.

Description

本発明は、コンクリート構造物の表層を緻密化する炭酸化養生方法に関する。   The present invention relates to a carbonation curing method for densifying the surface layer of a concrete structure.

コンクリートやモルタルに代表されるセメント硬化体は、大気中の二酸化炭素が表面から侵入して炭酸イオンとセメント成分が反応すると、その領域が中性化する。この中性化はセメント硬化体のひび割れを招く要因となる他、鉄筋コンクリートでは中性化の領域が深くなると鉄筋を腐食させる要因ともなる。このため、一般的には中性化は抑制すべきであるとされている。   In the hardened cement typified by concrete and mortar, when carbon dioxide in the atmosphere enters from the surface and carbonate ions react with cement components, the region becomes neutral. This neutralization causes cracking of the hardened cement body, and in reinforced concrete, when the neutralization region becomes deeper, it also causes corrosion of the reinforcing steel. For this reason, it is generally said that neutralization should be suppressed.

しかし、その一方で、セメント硬化体の表面近傍付近等、構造体の所定範囲内において炭酸ガスによる強制的な中性化（以下「炭酸化」という）の処理を行うことにより、コンクリート構造物の表層を緻密化することができることが知られている。これは、上記炭酸化の反応生成物が僅かに膨張してセメントマトリクスの空隙を埋め、それにより、緻密な構造が形成されることによるものとされている。この手法を用いることにより、コンクリートやモルタルの表面近傍に緻密で化学的に安定した層を設けることができ、セメントマトリクスからのカルシウムイオンの溶脱や、外部からの塩化物イオン等の侵入を抑制した長期耐久性に優れたセメント系材料が実現される（特許文献１〜３参照）。   However, on the other hand, by carrying out forced neutralization with carbon dioxide gas (hereinafter referred to as “carbonation”) within a predetermined range of the structure, such as near the surface of the hardened cementitious body, It is known that the surface layer can be densified. This is due to the fact that the carbonation reaction product slightly expands to fill the voids in the cement matrix, thereby forming a dense structure. By using this method, a dense and chemically stable layer can be provided near the surface of concrete and mortar, and leaching of calcium ions from the cement matrix and entry of chloride ions, etc. from the outside were suppressed. A cement-based material having excellent long-term durability is realized (see Patent Documents 1 to 3).

セメント硬化体を炭酸化することが可能な具体的な手段として、セメント硬化体を収容して外部の大気環境から遮蔽する遮蔽空間と、炭酸ガス濃度と所定範囲に調整可能な手段を設けた養生装置が開示されている（特許文献４参照）。   As specific means capable of carbonating the hardened cementitious body, a curing space that houses the hardened cementum and shields it from the outside air environment, and a means that can adjust the carbon dioxide concentration and the predetermined range. An apparatus is disclosed (see Patent Document 4).

特開２００６−３４８４６５号公報JP 2006-348465 A 特開２００６−１８２５８３号公報JP 2006-182583 A 特開２００７−２２８７８号公報JP 2007-22878 A 特開２００９−１４９４５６号公報JP 2009-149456 A

上記の通り、所定濃度の炭酸ガス中での反応促進による炭酸化養生の方法については、様々な手段が開示されている。しかし、炭酸ガスを用いる上記従来方法の場合、養生対象の構造体を、所定の炭酸ガス濃度を維持可能な遮蔽空間内に配置することが前提となっている。例えば、養生設備内に収容不可能な巨大なコンクリート構造体が養生の対象である場合には、そのような遮蔽空間の存在や設置を前提とする従来方法の適用は極めて困難であった。   As described above, various means are disclosed for the method of carbonation curing by promoting the reaction in a predetermined concentration of carbon dioxide gas. However, in the case of the conventional method using carbon dioxide gas, it is assumed that the structure to be cured is disposed in a shielded space capable of maintaining a predetermined carbon dioxide gas concentration. For example, when a huge concrete structure that cannot be accommodated in a curing facility is an object to be cured, it is extremely difficult to apply a conventional method based on the existence and installation of such a shielded space.

しかし、そのような巨大なコンクリート構造体のうちでも、例えば、コンクリート製の地下貯水槽や水処理のための浄化槽等、水と接触した状態での長期使用が前提とされる巨大なコンクリート製貯水構造体においては、コンクリート表面の水分への溶脱が問題となっており、それを防ぐための手段として、炭酸化養生を実施することのできる適切な具体的手段の開発が求められていた。   However, even in such a huge concrete structure, for example, a huge concrete reservoir that is assumed to be used for a long time in contact with water, such as a concrete underground reservoir or a septic tank for water treatment. In the structure, leaching of the concrete surface into moisture has become a problem, and as a means for preventing it, development of appropriate specific means capable of performing carbonation curing has been demanded.

本発明は上記状況に鑑みてなされたものであり、その目的は、例えば、養生対象が貯水機能を有するコンクリート構造物である場合において、容易に実施可能な炭酸化養生の方法を提供することにある。   This invention is made | formed in view of the said condition, The objective is providing the method of the carbonation curing which can be implemented easily, for example, when a curing object is a concrete structure which has a water storage function. is there.

本発明者らは、貯水可能な貯水域を有するコンクリート製貯水構造体を対象とする場合の炭酸化養生を、貯水域の内壁面の加熱乾燥、貯水域内閉空間の減圧、そして、貯水域内への二酸化炭素溶解水の注水によって行うことにより、当該コンクリート製貯水構造体の長期耐久性を、従来手段よりも、容易、且つ、確実に向上させることができることを見出し、本発明を完成するに至った。具体的には、本発明は以下のものを提供する。   The inventors have made carbonation curing in the case of targeting a concrete water storage structure having a water storage area capable of storing water, heating and drying the inner wall surface of the water storage area, decompressing the closed space in the water storage area, and into the water storage area. It was found that the long-term durability of the concrete water storage structure can be improved more easily and reliably than the conventional means by injecting the carbon dioxide-dissolved water. It was. Specifically, the present invention provides the following.

（１） 貯水可能な貯水域を有し、該貯水域の内壁面がセメント系硬化体で構成されているコンクリート製貯水構造体の炭酸化養生方法であって、前記貯水域を閉空間として空間内を減圧する減圧工程と、前記貯水域に、二酸化炭素溶解水を注水する注水工程と、を含むコンクリート製貯水構造体の炭酸化養生方法。   (1) A carbonation curing method for a concrete water storage structure having a water storage area capable of storing water, and an inner wall surface of the water storage area made of a cement-based hardened body, wherein the water storage area is a closed space. A carbonation curing method for a concrete water storage structure, comprising: a pressure reducing step for reducing the pressure inside; and a water injection step for pouring carbon dioxide-dissolved water into the water storage area.

（１）の発明によれば、貯水域を有するコンクリート製貯水構造体について、炭酸化養生を容易に行うことができる。これにより、貯水機能を有するコンクリート製貯水構造体の長期使用時における水分中へのコンクリート表面の溶脱を防ぎ、当該コンクリート製貯水構造体の長期耐久性を向上させることができる。   According to the invention of (1), carbonation curing can be easily performed for a concrete water storage structure having a water storage area. Thereby, leaching of the concrete surface to the moisture at the time of long-term use of the concrete water storage structure having a water storage function can be prevented, and the long-term durability of the concrete water storage structure can be improved.

（２） 前記注水工程の前に、前記貯水域の内壁面を加熱乾燥する乾燥工程を行う（１）に記載のコンクリート製貯水構造体の炭酸化養生方法。   (2) The carbonation curing method for a concrete water storage structure according to (1), wherein a drying step of heating and drying the inner wall surface of the water storage area is performed before the water injection step.

（２）の発明によれば、（１）の発明の効果を、より確実に、又、より好適に発現させることができる。   According to the invention of (2), the effect of the invention of (1) can be expressed more reliably and more suitably.

（３） 前記二酸化炭素溶解水に、炭酸塩を添加することにより、二酸化炭素溶解水のｐＨ調整を行う（１）又は（２）に記載のコンクリート製貯水構造体の炭酸化養生方法。   (3) The carbonation curing method for a concrete water storage structure according to (1) or (2), wherein the pH is adjusted by adding carbonate to the carbon dioxide-dissolved water.

（３）の発明によれば、（１）又は（２）の発明の効果を、より確実に、又、より好適に発現させることができる。   According to the invention of (3), the effect of the invention of (1) or (2) can be expressed more reliably and more suitably.

（４） 前記貯水域の内壁面に対向する位置に遮蔽部材を配置し、該遮蔽部材と前記内壁面との間に狭閉空間を形成して、前記狭閉空間内にて前記減圧工程及び前記注水工程を行う（１）から（３）のいずれかに記載のコンクリート製貯水構造体の炭酸化養生方法。   (4) A shielding member is disposed at a position facing the inner wall surface of the water storage area, a narrow space is formed between the shielding member and the inner wall surface, and the decompression step and The carbonation curing method for a concrete water storage structure according to any one of (1) to (3), wherein the water injection step is performed.

（４）の発明によれば、二酸化炭素溶解水の必要量を抑えつつ、（１）から（３）のいずれかに記載の発明の効果をより確実に発現させることができる。これにより、養生にかかるコストを低減することができる。   According to the invention of (4), the effect of the invention according to any one of (1) to (3) can be expressed more reliably while suppressing the required amount of carbon dioxide-dissolved water. Thereby, the cost concerning curing can be reduced.

（５） 前記狭閉空間内に正の圧力をかけた状態で、前記注水工程を行う（４）に記載のコンクリート製貯水構造体の炭酸化養生方法。   (5) The carbonation curing method for a concrete water storage structure according to (4), wherein the water injection step is performed in a state where a positive pressure is applied to the narrow closed space.

（５）の発明によれば、（４）に記載の発明における炭酸化の進行を促進して、その効果をより確実に発現させることができる。   According to the invention of (5), the progress of carbonation in the invention described in (4) can be promoted, and the effect can be expressed more reliably.

（６） 前記コンクリート製貯水構造体がコンクリート製地下貯水層である（１）から（５）のいずれかに記載のコンクリート製貯水構造体の炭酸化養生方法。   (6) The carbonation curing method for a concrete water storage structure according to any one of (1) to (5), wherein the concrete water storage structure is a concrete underground water reservoir.

（６）の発明によれば、従来、炭酸化養生の実施が困難であった地下貯水層についても、（１）から（５）のいずれかに記載の発明の効果を享受させて、当該コンクリート製貯水構造体の長期耐久性を向上させることができる。   According to the invention of (6), with respect to the underground reservoir that has been difficult to carry out carbonation curing, the concrete according to the invention described in any one of (1) to (5) is enjoyed. The long-term durability of the water storage structure can be improved.

本発明によれば、例えば、コンクリート製地下貯水層等、貯水機能を有するコンクリート製貯水構造体に炭酸化養生を施すことによって、当該コンクリート製貯水構造体の長期耐久性を、従来手段よりも、容易、且つ、確実に向上させることができる。   According to the present invention, for example, by subjecting a concrete water storage structure having a water storage function, such as a concrete underground water reservoir, to carbonation curing, the long-term durability of the concrete water storage structure is improved compared to conventional means. It can be improved easily and reliably.

本発明の炭酸化養生方法の対象となるコンクリート製貯水構造体の構成を模式的に示す断面図である。It is sectional drawing which shows typically the structure of the concrete water storage structure used as the object of the carbonation curing method of this invention. 本発明の炭酸化養生方法の一工程である乾燥工程の説明に供する図である。It is a figure where it uses for description of the drying process which is one process of the carbonation curing method of this invention. 本発明の炭酸化養生方法の一工程である減圧工程の説明に供する図である。It is a figure where it uses for description of the pressure reduction process which is one process of the carbonation curing method of this invention. 本発明の炭酸化養生方法の一工程である注水工程の説明に供する図である。It is a figure where it uses for description of the water injection process which is one process of the carbonation curing method of this invention. 本発明の炭酸化養生方法のその他の実施態様の説明に供する図である。It is a figure where it uses for description of the other embodiment of the carbonation curing method of this invention.

以下、本発明の実施形態について説明する。尚、本発明は以下の実施形態に限定されない。   Hereinafter, embodiments of the present invention will be described. The present invention is not limited to the following embodiment.

＜コンクリート製貯水構造体の炭酸化養生方法＞
［全体工程概要］
本発明のコンクリート製貯水構造体の炭酸化養生方法について、図１〜図５を参照しながら、その全体工程の概要を説明する。図１は、本発明の炭酸化養生方法の対象となるコンクリート製貯水構造体１の構成を模式的に示す断面図である。図１に示す通りコンクリート製貯水構造体１は、セメント系硬化体からなり、貯水域１１を備えることにより液体２を貯水する機能を有する構造体である。具体例としては、地下貯水槽や浄化槽等が挙げられる。 <Carbonation curing method for concrete water storage structure>
[Overview of overall process]
About the carbonation curing method of the concrete water storage structure of this invention, the outline | summary of the whole process is demonstrated, referring FIGS. FIG. 1 is a cross-sectional view schematically showing a configuration of a concrete water storage structure 1 which is an object of the carbonation curing method of the present invention. As shown in FIG. 1, the concrete water storage structure 1 is made of a cement-based hardened body, and is a structure having a function of storing the liquid 2 by providing a water storage area 11. Specific examples include underground water storage tanks and septic tanks.

図２〜図４は、本発明のコンクリート製貯水構造体の炭酸化養生方法を構成する各工程を模式的に説明する図である。本発明のコンクリート製貯水構造体の炭酸化養生方法は、図２〜図４に示す通り、貯水域１１を構成するセメント系硬化体を加熱乾燥する乾燥工程、貯水域１１の気圧を減圧する減圧工程、貯水域１１に、二酸化炭素溶解水２Ａを注水する注水工程を適宜組合せて行う養生方法である。以上の各工程のうち、注水工程と減圧工程以外のその他の各工程については、必ずしも本発明における必須の工程ではないが、これらを適宜組合せて行うことにより、より好ましい態様での本発明の方法の実施が可能となる。少なくとも上記の注水工程と減圧工程を含む各工程からなる本発明のコンクリート製貯水構造体の炭酸化養生方法によれば、コンクリート製貯水構造体の内壁面を二酸化炭素とを効率よく接触させることができる。又、この養生方法は、コンクリート製貯水構造体が構築されてから、実働開始までの期間中に行う。   2-4 is a figure which illustrates typically each process which comprises the carbonation curing method of the concrete water storage structure of this invention. As shown in FIGS. 2 to 4, the carbonation curing method for a concrete water storage structure according to the present invention includes a drying process for heating and drying a cement-based hardened body constituting the water storage area 11, and a pressure reduction for reducing the pressure in the water storage area 11. This is a curing method in which the water injection step of injecting the carbon dioxide-dissolved water 2A into the water storage area 11 is appropriately combined. Among the above steps, the other steps other than the water injection step and the depressurization step are not necessarily essential steps in the present invention, but the method of the present invention in a more preferred embodiment can be performed by appropriately combining these steps. Can be implemented. According to the carbonation curing method for a concrete water storage structure of the present invention comprising at least each of the water injection process and the pressure reduction process described above, the inner wall surface of the concrete water storage structure can be efficiently brought into contact with carbon dioxide. it can. This curing method is performed during the period from the construction of the concrete water storage structure to the start of actual operation.

尚、上記のセメント系硬化体に用いるセメントとしては、普通ポルトランドセメント等の一般的セメントを特に制限なく用いることができる。尚、ポルトランドセメントには、普通ポルトランドセメントの他、早強、超早強、中庸熱、低熱等の種類があるが、これら種々のポルトランドセメントの１種又は２種以上を配合するものを用いることができる。なかでも、普通ポルトランドセメント及び低熱ポルトランドセメントの１種又は２種を使用したものを特に好ましく用いることができる。又、上記のセメント系硬化体は、上記のセメントに加えて、更にγＣ２Ｓを含有するものを好ましく用いることができる。 In addition, as cement used for said cement-type hardened | cured material, common cement, such as normal Portland cement, can be especially used without a restriction | limiting. In addition to normal Portland cement, there are various types of Portland cement, such as early strength, ultra-early strength, moderate heat, low heat, etc. Use one that contains one or more of these various Portland cements. Can do. Especially, what uses 1 type or 2 types of normal Portland cement and low heat Portland cement can be used especially preferable. Further, the above cement hardened body, in addition to the above cement, can be preferably used those containing more rC 2 S.

［乾燥工程］
図２に示す通り、乾燥工程は、加熱バーナー３等の加熱手段により、コンクリート製貯水構造体１の貯水域１１を構成するセメント系硬化体を加熱乾燥する工程である。これにより、注水工程に際して、上記セメント系硬化体における毛管張力の作用を引き起こして、二酸化炭素溶解水２Ａを、上記セメント系硬化体内に浸透させることができる。 [Drying process]
As shown in FIG. 2, the drying step is a step of heating and drying the cement-based hardened body constituting the water storage area 11 of the concrete water storage structure 1 by heating means such as the heating burner 3. Thereby, in the water injection step, the action of capillary tension in the cement-based cured body can be caused, and the carbon dioxide-dissolved water 2A can penetrate into the cement-based cured body.

［減圧工程］
図３に示す通り、減圧工程は、貯水域１１内の気圧を減圧ポンプ４等の減圧手段により、貯水域１１内の気圧を減圧する工程である。これにより、上記のセメント系硬化体内に残存する水分を更に抽出して上記セメント系硬化体の乾燥を促進し、毛管張力の作用を、強く引き起こして、二酸化炭素溶解水２Ａを、上記セメント系硬化体内に十分に浸透させることができる。 [Decompression process]
As shown in FIG. 3, the depressurization step is a step of depressurizing the atmospheric pressure in the water storage area 11 by a depressurization means such as the depressurization pump 4. As a result, moisture remaining in the cement-based cured body is further extracted to promote drying of the cement-based cured body, and the action of capillary tension is strongly caused, so that the carbon dioxide-dissolved water 2A is converted into the cement-based cured body. Can penetrate into the body sufficiently.

コンクリート製貯水構造体１の貯水域１１が完全な気密性を有する遮蔽空間である場合は、容易に減圧可能である。そうでない場合であっても、必要な範囲で減圧時にのみ、貯水域１１を遮蔽空間とするための補助壁を設けることにより減圧工程を行うことができる。このような手段により、貯水域１１内を、１０ｋＰａ〜５０ｋＰａ気圧程度の負圧状態とすることにより、上記の通り、二酸化炭素溶解水２Ａのセメント系硬化体内への十分な浸透促進は可能である。   When the water storage area 11 of the concrete water storage structure 1 is a shielded space having perfect airtightness, the pressure can be easily reduced. Even if this is not the case, the depressurization step can be performed by providing an auxiliary wall for making the water storage area 11 a shielding space only at the time of depressurization within a necessary range. By making the inside of the water storage area 11 into a negative pressure state of about 10 kPa to 50 kPa atmospheric pressure by such means, as described above, sufficient penetration promotion of the carbon dioxide-dissolved water 2 </ b> A into the cement-based hardened body is possible. .

［注水工程］
図４に示す通り、注水工程は、上記乾燥工程及び減圧工程を終えた貯水域１１内に、二酸化炭素溶解水２Ａを注水する工程である。図４に示す通り、貯水域１１内の内壁面１２の全面に二酸化炭素溶解水２Ａが接するように、貯水域１１内の略全体を二酸化炭素溶解水２Ａで満たすことが好ましい。これにより、コンクリート製貯水構造体１の貯水域１１内の内壁面１２のほぼ全面が均一に炭酸化され、貯水域内の液体を湛えながら長期にわたって使用されることが一般的前提であるコンクリート製貯水構造体１の長期耐久性を極めて好ましい範囲にまで向上させることができる。 [Water injection process]
As shown in FIG. 4, the water injection step is a step of pouring the carbon dioxide-dissolved water 2A into the water storage area 11 after the drying step and the pressure reduction step. As shown in FIG. 4, it is preferable to fill substantially the entire water storage area 11 with the carbon dioxide-dissolved water 2A so that the carbon dioxide-dissolved water 2A is in contact with the entire inner wall surface 12 of the water storage area 11. Thereby, almost the entire inner wall surface 12 in the water storage area 11 of the concrete water storage structure 1 is uniformly carbonated, and the concrete water storage which is generally used for a long time while holding the liquid in the water storage area. The long-term durability of the structure 1 can be improved to a very preferable range.

上記の二酸化炭素溶解水２Ａとしては、様々な状態にあるＣＯ２を溶解させた液体を適宜用いることができるが、マイクロバブルやナノバブルレベルでＣＯ２を大量に溶解させた水を好ましく用いることができる。二酸化炭素溶解水２Ａ中の二酸化炭素濃度は５００ｍｇ／ｌ〜１５００ｍｇ／ｌ程度であることが好ましい。 As the carbon dioxide-dissolved water 2A, liquids in which CO 2 in various states is dissolved can be used as appropriate, but water in which a large amount of CO 2 is dissolved at the microbubble or nanobubble level is preferably used. it can. The carbon dioxide concentration in the carbon dioxide-dissolved water 2A is preferably about 500 mg / l to 1500 mg / l.

又、本発明のコンクリート製貯水構造体の炭酸化養生方法のコンクリート製貯水構造体の耐久性向上効果の更なる促進のためには、二酸化炭素溶解水２ＡのｐＨを、常時アルカリ側に保つことが好ましい。より具体的には、ｐＨを１０以上に保持しながら養生を行うことが好ましい。例えば、Ｎａ２ＣＯ３や、或いは、Ｋ２ＣＯ３等の炭酸塩を溶解させることにより、二酸化炭素溶解水２ＡのｐＨを、そのような範囲に保持することが好ましい。 Moreover, in order to further promote the durability improvement effect of the concrete water storage structure of the concrete water storage structure of the present invention, the pH of the carbon dioxide-dissolved water 2A is always kept at the alkali side. Is preferred. More specifically, it is preferable to perform curing while maintaining the pH at 10 or more. For example, it is preferable to maintain the pH of the carbon dioxide-dissolved water 2A within such a range by dissolving carbonates such as Na 2 CO 3 or K 2 CO 3 .

上記注水後、二酸化炭素溶解水２Ａを貯水域１１内に満たした状態で、コンクリート製貯水構造体１の養生を、７〜２８日程度の期間行う。この養生期間にコンクリート製貯水構造体１の内壁面１２付近の部分についての炭酸化が進行し、これにより、貯水域１１の内壁面１２付近の部分が顕著に緻密化され、貯水機能を発揮しながらの長期使用を前提とするコンクリート製貯水構造体１に、高い長期耐久性を備えさせることができる。   After the water injection, the concrete water storage structure 1 is cured for a period of about 7 to 28 days with the carbon dioxide-dissolved water 2A filled in the water storage area 11. During this curing period, the carbonization of the portion near the inner wall surface 12 of the concrete water storage structure 1 proceeds, and as a result, the portion near the inner wall surface 12 of the water storage area 11 is remarkably densified and exhibits a water storage function. However, the concrete water storage structure 1 premised on long-term use can be provided with high long-term durability.

又、本発明のコンクリート製貯水構造体の炭酸化養生方法の他の実施態様として、図５に示す方法を挙げることができる。この実施態様においては、貯水域１１の内壁面１２を覆うように気密性を有する樹脂パネル等の遮蔽部材５を設置して、内壁面１２との間に狭閉空間を形成し、当該狭閉空間内にて減圧工程及び注水工程を行う。この追加的構成による処理を行うことにより、二酸化炭素溶解水２Ａの使用量を節減しながら、炭酸化をより速やかに促進させることができる。   Moreover, the method shown in FIG. 5 can be mentioned as another embodiment of the carbonation curing method for the concrete water storage structure of the present invention. In this embodiment, a shielding member 5 such as a resin panel having airtightness is installed so as to cover the inner wall surface 12 of the water storage area 11 to form a narrow space between the inner wall surface 12 and the narrow wall. A decompression step and a water injection step are performed in the space. By performing the treatment with this additional configuration, carbonation can be accelerated more quickly while reducing the amount of carbon dioxide-dissolved water 2A used.

又、上記のように狭閉空間を形成して本発明のコンクリート製貯水構造体の炭酸化養生方法を実施する場合においては、注水工程の際、例えば加圧ポンプ６による空気圧により、内壁面１２との間の狭閉空間に正の圧力をかけながら、注水を行うことが更に好ましい。これにより、コンクリート製貯水構造体１の内壁面１２への二酸化炭素の浸透を促進して、これにより所望の程度の炭酸化処理を、より速やかに進行させることが可能となる。   Further, when the carbonation curing method for a concrete water storage structure of the present invention is performed by forming a narrow closed space as described above, the inner wall surface 12 is applied by, for example, air pressure by the pressure pump 6 during the water injection process. More preferably, water injection is performed while positive pressure is applied to the narrow closed space between the two. Thereby, the penetration of carbon dioxide into the inner wall surface 12 of the concrete water storage structure 1 is promoted, and thereby a desired degree of carbonation treatment can be advanced more rapidly.

尚、養生期間中においては、二酸化炭素溶解水２Ａの温度を適宜制御することが好ましい。養生温度が高いほどセメント水和反応の反応速度が増大し、又、γＣ２Ｓを配合したものでは炭酸化温度が高いほど炭酸イオンとの反応の速度が大きくなるので、炭酸化養生を高温で行うと早期に高強度化及び表層の高緻密化が実現できる。具体的には２５℃以上の温度に制御することが望ましく、４０℃以上に制御することがより効果的である。ただし、あまり高温での養生を実現するには困難を伴うことが多いので、通常７０℃以下の範囲で行えばよい。 In addition, during the curing period, it is preferable to appropriately control the temperature of the carbon dioxide-dissolved water 2A. The higher the curing temperature, the higher the reaction rate of the cement hydration reaction. In the case of blending γC 2 S, the higher the carbonation temperature, the greater the rate of reaction with carbonate ions. If done, high strength and high density of the surface layer can be realized at an early stage. Specifically, it is desirable to control the temperature to 25 ° C. or higher, and it is more effective to control it to 40 ° C. or higher. However, since it is often difficult to realize curing at a very high temperature, it is usually performed in a range of 70 ° C. or less.

以上説明した本発明のコンクリート製貯水構造体の炭酸化養生方法によれば、長期に及ぶ貯水機能の発揮を前提とするコンクリート製貯水構造体１の炭酸化養生の方法を、従来一般的であった炭酸ガスによる養生に代えて、貯水域への二酸化炭素溶解水の注水による炭酸化養生を施す処理とした点に特徴がある。これにより、コンクリート製貯水構造体１の構造体の長期使用時における内壁面１２を構成するセメント硬化体の水分中への溶脱を防ぎ、コンクリート製貯水構造体１の長期耐久性を、従来よりも容易、且つ、確実に向上させることができる。又、特に炭酸化養生工程の実施が極めて困難である地下に設置される液化ガスの貯水層等、コンクリート製地下貯水層に対しても本願は従来手段よりも遙かに容易に実施することが可能な養生手段である。   According to the carbonation curing method of the concrete water storage structure of the present invention described above, the carbonation curing method of the concrete water storage structure 1 on the premise of exhibiting a long-term water storage function has been conventionally common. Instead of curing with carbon dioxide gas, the treatment is characterized by carbonation curing by injecting carbon dioxide-dissolved water into the reservoir. As a result, the hardened cement body constituting the inner wall surface 12 of the concrete water storage structure 1 during the long-term use is prevented from leaching into the water, and the long-term durability of the concrete water storage structure 1 is improved compared to the conventional case. It can be improved easily and reliably. In addition, the present application can be carried out much more easily than conventional means, particularly for underground reservoirs made of concrete such as liquefied gas reservoirs installed underground where it is extremely difficult to carry out the carbonation curing process. It is a possible curing method.

１ コンクリート製貯水構造体
１１ 貯水域
１２ 内壁面
２ 液体
２Ａ 二酸化炭素溶解水２Ａ
３ 加熱バーナー
４ 減圧ポンプ
５ 気密性シート
６ 加圧ポンプ DESCRIPTION OF SYMBOLS 1 Concrete water storage structure 11 Water storage area 12 Inner wall surface 2 Liquid 2A Carbon dioxide dissolved water 2A
3 Heating burner 4 Pressure reducing pump 5 Airtight sheet 6 Pressure pump

Claims (6)

貯水可能な貯水域を有し、該貯水域の内壁面がセメント系硬化体で構成されているコンクリート製貯水構造体の炭酸化養生方法であって、
前記貯水域を閉空間として空間内を減圧する減圧工程と、
前記貯水域に、二酸化炭素溶解水を注水する注水工程と、を含むコンクリート製貯水構造体の炭酸化養生方法。 A carbonation curing method for a concrete water storage structure having a water storage area capable of storing water, and an inner wall surface of the water storage area made of a cement-based hardened body,
A pressure reducing step for reducing the pressure in the space with the water storage area as a closed space;
A carbonation curing method for a concrete water storage structure, comprising: a water injection step of injecting carbon dioxide-dissolved water into the water storage area. 前記注水工程の前に、前記貯水域の内壁面を加熱乾燥する乾燥工程を行う請求項１に記載のコンクリート製貯水構造体の炭酸化養生方法。   The carbonation curing method for a concrete water storage structure according to claim 1, wherein a drying step of heating and drying an inner wall surface of the water storage area is performed before the water injection step. 前記二酸化炭素溶解水に、炭酸塩を添加することにより、二酸化炭素溶解水のｐＨ調整を行う請求項１又は２に記載のコンクリート製貯水構造体の炭酸化養生方法。   The carbonation curing method for a concrete water storage structure according to claim 1 or 2, wherein the pH of the carbon dioxide-dissolved water is adjusted by adding a carbonate to the carbon dioxide-dissolved water. 前記貯水域の内壁面に対向する位置に遮蔽部材を配置し、該遮蔽部材と前記内壁面との間に狭閉空間を形成して、前記狭閉空間内にて前記減圧工程及び前記注水工程を行う請求項１から３のいずれかに記載のコンクリート製貯水構造体の炭酸化養生方法。   A shielding member is disposed at a position facing the inner wall surface of the water storage area, a narrow space is formed between the shielding member and the inner wall surface, and the pressure reduction step and the water injection step are performed in the narrow space. The carbonation curing method for a concrete water storage structure according to any one of claims 1 to 3. 前記狭閉空間内に正の圧力をかけた状態で、前記注水工程を行う請求項４に記載のコンクリート製貯水構造体の炭酸化養生方法。   The carbonation curing method for a concrete water storage structure according to claim 4, wherein the water injection step is performed in a state where a positive pressure is applied to the narrow closed space. 前記コンクリート製貯水構造体がコンクリート製地下貯水層である請求項１から５のいずれかに記載のコンクリート製貯水構造体の炭酸化養生方法。   The carbonation curing method for a concrete water storage structure according to any one of claims 1 to 5, wherein the concrete water storage structure is a concrete underground water reservoir.
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