JPH10218687A - Carbonation-suppressant for concrete or mortar - Google Patents

Carbonation-suppressant for concrete or mortar

Info

Publication number
JPH10218687A
JPH10218687A JP3554897A JP3554897A JPH10218687A JP H10218687 A JPH10218687 A JP H10218687A JP 3554897 A JP3554897 A JP 3554897A JP 3554897 A JP3554897 A JP 3554897A JP H10218687 A JPH10218687 A JP H10218687A
Authority
JP
Japan
Prior art keywords
carbonation
concrete
acid
organic acid
aluminum salt
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
JP3554897A
Other languages
Japanese (ja)
Inventor
Jiyouhei Matsuda
丞平 松田
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.)
Taki Chemical Co Ltd
Original Assignee
Taki Chemical Co Ltd
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 Taki Chemical Co Ltd filed Critical Taki Chemical Co Ltd
Priority to JP3554897A priority Critical patent/JPH10218687A/en
Publication of JPH10218687A publication Critical patent/JPH10218687A/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
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • 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
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • 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
    • C04B41/00After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • 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
    • C04B2103/0004Compounds chosen for the nature of their cations
    • C04B2103/0021Compounds of elements having a valency of 3
    • 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
    • C04B2103/60Agents for protection against chemical, physical or biological attack

Abstract

PROBLEM TO BE SOLVED: To obtain a safe carbonation-suppressant excellent in processability as well as properties and quality. SOLUTION: This carbonation-suppressant is a basic organic acid aluminum salt with basicity of 10-75% and exhibits an excellent carbonation-suppressing effect e.g. through dipping itself for 10sec.-30min. or spraying itself to concrete or mortar in a state of the 0.5-20wt.% solution if applied as a solution and is excellent also in safety in processing because of aluminum salt. If an organic acid of the basic organic acid aluminum salt is lactic acid or a mixture of lactic acid with an organic acid other than lactic acid (where the molar ratio of the organic acid other than lactic acid/lactic acid is 0.1-2.4), the carbonation- suppressant exhibits especially excellent effect on concrete or mortar. In addition, the carbonation-suppressant is extraordinarily excellent in low price and easiness to produce.

Description

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

【0001】[0001]

【産業上の利用分野】本発明は塩基性有機酸アルミニウ
ム塩からなるコンクリートまたはモルタル用炭酸化抑制
剤に関する。
The present invention relates to a carbonation inhibitor for concrete or mortar comprising a basic organic acid aluminum salt.

【0002】[0002]

【従来の技術】コンクリートやモルタルは、主要成分に
各種セメントを使用し、重要な建築材料として広く用い
られている。その用途は、一般建築物をはじめ、高層建
築物、高速道路、橋梁、トンネル、地盤強化構造材等多
種多様である。
2. Description of the Related Art Concrete and mortar, which use various cements as main components, are widely used as important building materials. Its applications are diverse, including general buildings, high-rise buildings, highways, bridges, tunnels, and ground-reinforced structures.

【0003】また、コンクリートやモルタルをオートク
レーブ養生し、高強度化したオートクレーブ養生コンク
リートも広く使用されている。特に、コンクリートおよ
びモルタルに多数の気泡を含ませて軽量化、断熱性等の
性能を付与し、さらにオートクレーブ養生により強度を
アップさせたものは、軽量気泡コンクリートまたはAL
C(Autoclaved Lightweight Concrete)と呼ばれ、住
宅、建築物、耐火建築物等の壁、床、屋根、間仕切り等
に広く使用されている。この軽量気泡コンクリートの一
般的な製造方法としては、ポルトランドセメント、けい
石、生石灰等を主原料としたスラリーに起泡剤および発
泡剤を用い気泡によって軽量化し、室内養生もしくは1
00℃以下の蒸気養生を行った後、150〜220℃で
オートクレーブ養生を行い製造される。
[0003] Autoclave-cured concrete obtained by autoclaving concrete or mortar to increase the strength is also widely used. In particular, concrete and mortar that contain many air bubbles to impart performance such as weight reduction and heat insulation, and are further strengthened by autoclaving are lightweight lightweight concrete or AL.
It is called C (Autoclaved Lightweight Concrete) and is widely used for walls, floors, roofs, partitions, etc. of houses, buildings, fire-resistant buildings and the like. As a general method for producing this lightweight cellular concrete, a foaming agent and a foaming agent are used for a slurry containing Portland cement, silica stone, quick lime or the like as a main raw material to reduce the weight of the concrete by air bubbles and to cure indoors.
After steam curing at 00 ° C. or lower, autoclave curing is performed at 150 to 220 ° C. to produce the product.

【0004】これらのコンクリートやモルタルは、主要
成分であるセメントから由来するカルシウム(アルカ
リ)を多量に含有するため、大気中に含まれる二酸化炭
素(炭酸ガス)に由来する炭酸イオン(弱酸)と反応し
炭酸カルシウム(CaCO3)を生成することが知られ
ている。このような一般的なコンクリートの炭酸化現象
は、弱酸性の炭酸イオンにより、アルカリ性のコンクリ
ートが中和されて中性になることから「中性化」と呼ば
れている。鉄筋コンクリートなどの場合は、鉄筋の部分
まで「中性化」が進行すると、コンクリートのアルカリ
により抑制されていた鉄筋の腐食が始まる。そして鉄筋
が腐食すると、腐食の進行に伴い体積膨脹するために、
内部圧力が上昇し、この圧力が周囲のコンクリートの強
度を上回ったときにコンクリートの亀裂、剥離といった
現象が発生する。
[0004] Since these concretes and mortars contain a large amount of calcium (alkali) derived from cement as a main component, they react with carbonate ions (weak acids) derived from carbon dioxide (carbon dioxide) contained in the atmosphere. It is known to produce calcium carbonate (CaCO 3 ). Such a general concrete carbonation phenomenon is called "neutralization" because alkaline concrete is neutralized by neutral acidic carbonate ions to become neutral. In the case of reinforced concrete or the like, when the “neutralization” progresses to the portion of the reinforcing bar, corrosion of the reinforcing bar, which has been suppressed by the alkali of the concrete, starts. And when the rebar corrodes, the volume expands as the corrosion progresses,
When the internal pressure rises and this pressure exceeds the strength of the surrounding concrete, phenomena such as cracking and peeling of the concrete occur.

【0005】また、軽量気泡コンクリート(ALC)を
含むオートクレーブ養生コンクリートの「炭酸化」と
は、コンクリートの固体部分に含まれるトバモライト結
晶やCSHゲルと空気中の炭酸化ガスが反応して炭酸カ
ルシウムを生成することを云う。そして、その結果、炭
酸化カルシウムが生成した部分で体積変化が起こり亀裂
を生じ、オートクレーブ養生コンクリートの耐久性を低
下させるという問題を生じることが知られている。特
に、軽量化を図るために、多量の気泡を内在させている
ALCは、表面積が非常に大きくなるために、炭酸ガス
との接触面積も大きくなり、他のコンクリートやモルタ
ルと比較して「炭酸化」し易く、大きな問題点となる。
[0005] "Carbonation" of autoclaved concrete including lightweight cellular concrete (ALC) refers to the reaction of tobermorite crystals or CSH gel contained in the solid part of concrete with carbonation gas in the air to form calcium carbonate. Generating. As a result, it is known that a volume change occurs in a portion where the calcium carbonate is generated, a crack is generated, and a problem that durability of the autoclaved concrete is reduced is caused. In particular, ALC, in which a large amount of air bubbles are present in order to reduce the weight, has a very large surface area, and therefore has a large contact area with carbon dioxide gas. This is a major problem.

【0006】本発明で云う炭酸化とは、これら一般コン
クリートにおける「中性化」とオートクレーブ養生コン
クリートにおける「炭酸化」の両方を意味する。
The term "carbonation" as used in the present invention means both "neutralization" in these ordinary concretes and "carbonation" in autoclaved concrete.

【0007】以上のような炭酸化を防止するために、従
来から一般にコンクリート、モルタルあるいはオートク
レーブ養生コンクリートの表面に塗料を塗って炭酸化を
遅らせる処理が施されているが、炭酸化の速度は塗料の
厚さに反比例するため、十分な効果を得るためには、か
なり厚い塗膜が必要でる。
[0007] In order to prevent the above-mentioned carbonation, a treatment for delaying the carbonation by applying a paint to the surface of concrete, mortar or autoclaved concrete has been generally performed. In order to obtain a sufficient effect, a considerably thick coating film is required.

【0008】そのため炭酸化を抑制する方法として、次
のような技術が開発されている。1)特開昭57−17
9009〜13号公報:軽量気泡コンクリート中に有機
酸エステルやストロンチウム化合物を添加し、炭酸化を
抑制する、2)特開平5−339071号公報:軽量気
泡コンクリートに炭素数が3〜8であるカルボン酸とイ
オン化ポテンシャルがカルシウム以上である金属の塩の
溶液を含浸させる、3)特開平6−211582号公
報:軽量気泡コンクリートにホウ酸を含浸させる等であ
る。
Therefore, the following technology has been developed as a method for suppressing carbonation. 1) JP-A-57-17
Japanese Patent No. 9009-13: Addition of an organic acid ester or a strontium compound to lightweight cellular concrete to suppress carbonation 2) JP-A-5-339071: Carbon containing 3 to 8 carbon atoms in lightweight cellular concrete 3) Impregnating with a solution of a salt of an acid and a metal having an ionization potential equal to or higher than calcium. 3) JP-A-6-211582: Impregnating boric acid into lightweight cellular concrete.

【0009】しかし、1)の有機酸エステルやストロン
チウム化合物を軽量気泡コンクリート等のオートクレー
ブ養生コンクリート製造時に添加しても、得られる効果
は不十分であるのみならず、オートクレーブ養生時にト
バモライト結晶の成長を遅らせる働きがあり、実用上問
題である。
[0009] However, even if the organic acid ester or strontium compound of 1) is added during the production of an autoclave-cured concrete such as lightweight cellular concrete, the effect obtained is not sufficient, and the growth of tobermorite crystals during the autoclave curing is not sufficient. It has a function of delaying, which is a practical problem.

【0010】また、2)の軽量気泡コンクリートに炭素
数が3〜8であるカルボン酸とイオン化ポテンシャル
(イオン化電位)がカルシウム以上である金属の塩の水
溶液を含浸させる方法で例示されているプロピオン酸亜
鉛、酪酸マグネシウムは溶解性に難があり、実際には使
用しにくいものである。また他に例示されている鉛塩、
ニッケル塩、カドミウム塩、コバルト塩などは、安全性
の面から使用が制限される。
Propionic acid is exemplified by the method of 2) impregnating the lightweight cellular concrete with an aqueous solution of a carboxylic acid having 3 to 8 carbon atoms and a salt of a metal having an ionization potential (ionization potential) of not less than calcium. Zinc and magnesium butyrate are difficult to dissolve and are actually difficult to use. Lead salts that are also exemplified,
Use of nickel salts, cadmium salts, cobalt salts and the like is restricted from the viewpoint of safety.

【0011】ところでイオン化ポテンシャルとは、気態
の原子または分子の基底状態から1個の電子を無限遠に
引き離すに要する最低エネルギ−のことである。特開平
5−339071号公報の実施例には各金属原子の第一
イオン化ポテンシャルが記載され、それによると亜鉛
9.03eV、マグネシウム7.65eV、鉛7.42
eV、ニッケル7.64eVとなっている。そしてカル
シウムの第一イオン化ポテンシャルは6.08eVであ
り、本発明に使用するアルミニウムの第一イオン化ポテ
ンシャルは、5.96eVでカルシウム以下である。
The ionization potential is the minimum energy required to separate one electron from the ground state of a gaseous atom or molecule to infinity. In the example of JP-A-5-339071, the first ionization potential of each metal atom is described. According to this, 9.03 eV of zinc, 7.65 eV of magnesium, and 7.42 of lead are described.
eV and 7.64 eV of nickel. The first ionization potential of calcium is 6.08 eV, and the first ionization potential of aluminum used in the present invention is 5.96 eV, which is lower than calcium.

【0012】次に3)軽量気泡コンクリートにホウ酸を
含浸させる方法は、ホウ酸溶液が他の無機酸、有機酸の
溶液と同様に軽量気泡コンクリート自身を溶解させ、表
面が侵食されるために品質に問題が残る。
Next, 3) The method of impregnating the lightweight cellular concrete with boric acid is based on the fact that the boric acid solution dissolves the lightweight cellular concrete itself like other inorganic and organic acid solutions, and the surface is eroded. Problems remain in quality.

【0013】以上述べたように性能、品質ともに問題の
無い優れたコンクリートやモルタルの炭酸化抑制剤は未
だ開発されていない。
As described above, an excellent carbonation inhibitor for concrete or mortar which has no problem in both performance and quality has not yet been developed.

【0014】[0014]

【発明が解決しようとする課題】そこで本発明は、性
能、品質ともに優れかつ作業性にも優れた安全な、コン
クリートまたはモルタル用炭酸化抑制剤を提供するもの
である。
Accordingly, an object of the present invention is to provide a carbonation inhibitor for concrete or mortar which is excellent in both performance and quality and excellent in workability.

【0015】[0015]

【発明を解決するための手段】即ち、本発明は塩基度1
0〜75%の範囲の塩基性有機酸アルミニウム塩からな
るコンクリートまたはモルタル用炭酸化抑制剤に関す
る。
That is, the present invention provides a basicity of 1
The present invention relates to a carbonation inhibitor for concrete or mortar comprising a basic organic acid aluminum salt in the range of 0 to 75%.

【0016】[0016]

【発明の実施の形態】本発明で使用する有機酸アルミニ
ウム塩は、塩基度10〜75%の塩基性有機酸アルミニ
ウム塩を使用する。塩基度が10%以下でも75%以上
でも本発明の効果を期待することはできず、勿論有機酸
アルミニウムの正塩では本発明の効果を期待することは
できない。
BEST MODE FOR CARRYING OUT THE INVENTION As an organic aluminum salt used in the present invention, a basic organic aluminum salt having a basicity of 10 to 75% is used. Even if the basicity is 10% or less or 75% or more, the effect of the present invention cannot be expected. Of course, the effect of the present invention cannot be expected with a normal salt of an organic acid aluminum salt.

【0017】本発明の塩基度10〜75%の範囲の塩基
性有機酸アルミニウム塩に使用しうる有機酸を挙げる
と、モノカルボン酸、ジカルボン酸、オキシカルボン酸
等である。モノカルボン酸としては、ギ酸、酢酸、プロ
ピオン酸、n−酪酸、吉草酸等が挙げられ、ジカルボン
酸としては、シュウ酸、コハク酸、マレイン酸、マロン
酸、フタル酸、グルタル酸等が挙げられ、オキシカルボ
ン酸としては、グリコール酸、乳酸、酒石酸、リンゴ
酸、クエン酸等が挙げられる。
The organic acids which can be used in the basic organic acid aluminum salt having a basicity of 10 to 75% according to the present invention include monocarboxylic acids, dicarboxylic acids and oxycarboxylic acids. Monocarboxylic acids include formic acid, acetic acid, propionic acid, n-butyric acid, valeric acid and the like, and dicarboxylic acids include oxalic acid, succinic acid, maleic acid, malonic acid, phthalic acid, glutaric acid and the like. Examples of the oxycarboxylic acid include glycolic acid, lactic acid, tartaric acid, malic acid, citric acid and the like.

【0018】これらの有機酸の中でもオキシカルボン酸
を使用した塩基性オキシカルボン酸アルミニウム塩が溶
解度が高く好ましい。特に塩基性乳酸アルミニウム塩
が、溶解度と溶液状態での安定性の点から好ましい。ま
た、2種以上の有機酸を組み合わせて塩基性有機酸アル
ミニウム塩を製造しても同様の炭酸化抑制効果が得られ
る。特に好ましい有機酸の組み合せは乳酸と乳酸以外の
有機酸であってその使用割合は乳酸以外の有機酸/乳酸
(モル比)=0.1〜2.4である。この範囲で組み合
わされた本発明の塩基性有機酸アルミニウム塩は特に炭
酸化抑制効果が高い。
Among these organic acids, a basic aluminum oxycarboxylate using an oxycarboxylic acid is preferred because of its high solubility. In particular, basic aluminum lactate is preferred from the viewpoint of solubility and stability in a solution state. Further, even when a basic organic acid aluminum salt is produced by combining two or more kinds of organic acids, the same effect of suppressing carbonation can be obtained. A particularly preferred combination of organic acids is lactic acid and an organic acid other than lactic acid, and the use ratio thereof is organic acid other than lactic acid / lactic acid (molar ratio) = 0.1 to 2.4. The basic organic acid aluminum salt of the present invention combined in this range has a particularly high effect of suppressing carbonation.

【0019】本発明の塩基度10〜75%の範囲の塩基
性有機酸アルミニウム塩は、溶液状態で使用して最も良
くその炭酸化抑制効果を発揮するが、粉末で使用しても
良い。
The aluminum salt of a basic organic acid having a basicity in the range of 10 to 75% of the present invention is best used in the form of a solution to exert its carbonation suppressing effect, but may be used in the form of a powder.

【0020】次に、本発明の塩基性有機酸アルミニウム
塩の製造方法を述べる。例えば塩基性乳酸アルミニウム
の場合、塩化アルミニウム、硫酸アルミニウム、塩基性
塩化アルミニウム、硝酸アルミニウム等の可溶性アルミ
ニウム塩とアルカリ金属あるいはアンモニウムの炭酸
塩、重炭酸塩とを反応させ、あるいはアルミン酸アルカ
リと炭酸ガスとを反応させ、沈澱するアルミナ水和物を
乳酸に溶解することにより容易に本発明の塩基性有機酸
アルミニウム塩を製造することができる。
Next, a method for producing the basic organic acid aluminum salt of the present invention will be described. For example, in the case of basic aluminum lactate, a soluble aluminum salt such as aluminum chloride, aluminum sulfate, basic aluminum chloride, and aluminum nitrate is reacted with an alkali metal or ammonium carbonate or bicarbonate, or alkali aluminate and carbon dioxide gas. And dissolving the precipitated alumina hydrate in lactic acid, whereby the basic organic acid aluminum salt of the present invention can be easily produced.

【0021】また、乳酸に代えて他の有機酸を使用する
ことにより、その使用有機酸に応じて塩基性ギ酸アルミ
ニウム、塩基性酢酸アルミニウム、塩基性酒石酸アルミ
ニウム、塩基性グリコール酸アルミニウム等を製造する
ことができる。また前記のアルミナ水和物に所望割合に
応じて乳酸と乳酸以外の有機酸の混酸を加え、アルミナ
水和物を溶解することにより乳酸と各種有機酸をさまざ
まに組み合わせた塩基性有機酸アルミニウム塩を製造す
ることができる。本発明の塩基性有機酸アルミニウム塩
はその他公知のいずれの方法によって製造したものであ
っても良い。
Further, by using another organic acid in place of lactic acid, basic aluminum formate, basic aluminum acetate, basic aluminum tartrate, basic aluminum glycolate and the like are produced according to the organic acid used. be able to. Also, a basic organic acid aluminum salt in which lactic acid and various organic acids are variously combined by adding a mixed acid of lactic acid and an organic acid other than lactic acid to the alumina hydrate according to a desired ratio and dissolving the alumina hydrate. Can be manufactured. The basic organic acid aluminum salt of the present invention may be produced by any other known method.

【0022】ところで本発明に於いて塩基度は、{(一
定量の化合物中のアルミニウムの化学当量数)−(一定
量の化合物中の有機酸の化学当量数)}/(一定量の化
合物中のアルミニウムの化学当量数) ×100(%)
で定義される。例えば塩基性コハク酸アルミニウム中に
アルミニウムが4.6g、コハク酸が15g含有されて
いる場合、塩基度は、{(4.6/27)×3−(15
/118)×2}/((4.6/27)×3)×100
=50.3(%)である。
In the present invention, the basicity is defined as {(chemical equivalent number of aluminum in a certain amount of compound)-(chemical equivalent number of organic acid in a certain amount of compound)} / (chemical amount of an organic acid in a certain amount of compound). Chemical equivalent number of aluminum) x 100 (%)
Is defined by For example, when 4.6 g of aluminum and 15 g of succinic acid are contained in basic aluminum succinate, the basicity is {(4.6 / 27) × 3- (15
/118)×2}/((4.6/27)×3)×100
= 50.3 (%).

【0023】次に本発明の塩基性有機酸アルミニウム塩
のコンクリートまたはモルタル用炭酸化抑制剤としての
使用態様を述べる。溶液状態で使用する場合、先ず本発
明の塩基性有機酸アルミニウム塩を水に溶解し溶液にす
る。次いでコンクリートまたはモルタルをこの塩基性有
機酸アルミニウム塩溶液に10秒から30分程度浸漬す
る方法。別法としてコンクリート等の表面に塩基性有機
酸アルミニウム塩溶液をスプレーで吹き付けるか、ハケ
塗りする方法等である。
Next, the use of the basic organic acid aluminum salt of the present invention as a carbonation inhibitor for concrete or mortar will be described. When used in a solution state, the basic organic acid aluminum salt of the present invention is first dissolved in water to form a solution. Then, concrete or mortar is immersed in the basic organic acid aluminum salt solution for about 10 seconds to 30 minutes. As another method, a method of spraying a basic organic acid aluminum salt solution on a surface of concrete or the like by spraying or brush-painting the surface is used.

【0024】本発明抑制剤の使用方法はこれらに限定さ
れるものではなく、塩基性有機酸アルミニウム塩溶液と
コンクリートやモルタルを接触させる方法であればいか
なる方法でも良いが溶液状態で使用するのが最も効果的
である。塩基性有機酸アルミニウム塩を溶液として使用
する場合その使用濃度はAl23換算で0.1〜5.0
重量%の範囲が良い。Al23換算濃度が0.1重量%
以下の場合は、炭酸化抑制効果が低くなり、5.0重量
%以上の場合は、濃度を上げてもそれに見合う炭酸化抑
制効果の向上が得られない。
The method of using the inhibitor of the present invention is not limited to these, and any method may be used as long as the basic organic acid aluminum salt solution is brought into contact with concrete or mortar. Most effective. The basic organic aluminum salt that use concentrations when used as a solution in terms of Al 2 O 3 0.1-5.0
The range of weight% is good. Al 2 O 3 conversion concentration is 0.1% by weight
In the following cases, the effect of suppressing carbonation is low. When the concentration is 5.0% by weight or more, even if the concentration is increased, the effect of suppressing carbonation cannot be improved correspondingly.

【0025】また、浸漬等により塩基性有機酸アルミニ
ウム塩溶液とコンクリートまたはモルタルを接触させる
時間は、塩基性有機酸アルミニウム塩溶液の濃度にもよ
るが、前述の通り10秒から30分が望ましい。10秒
以下の場合は、塩基性有機酸アルミニウム塩のコンクリ
ート等への吸着が不充分で炭酸化抑制効果は殆ど得られ
ず、また30分以上接触させてもそれに見合う炭酸化抑
制効果の向上は望めない。
The time for bringing the basic organic acid aluminum salt solution into contact with concrete or mortar by immersion or the like depends on the concentration of the basic organic acid aluminum salt solution, but is preferably 10 seconds to 30 minutes as described above. In the case of less than 10 seconds, the adsorption of the basic organic acid aluminum salt to concrete or the like is insufficient, so that the effect of suppressing carbonation is hardly obtained. I can't hope.

【0026】以下に実施例を挙げ本発明をさらに説明す
る。尚、特に断らない限り%は全て重量%を意味する。
Hereinafter, the present invention will be further described with reference to examples. In addition, unless otherwise specified, all% means% by weight.

【0027】[0027]

【実施例】【Example】

(実施例1〜11、比較例1〜4) <供試体>ALCのサンプルとして商品名シズカライト
「小野田エー・エル・シー(株)製」(気孔率85〜8
7%)を2×2×3cmに切断し、使用した。 <塩基性有機酸アルミニウム塩溶液による炭酸化抑制処
理>所定濃度の塩基性有機酸アルミニウム塩溶液を供試
体に1分間浸漬させた後105℃の乾燥機で5時間乾燥
させた。 <炭酸ガス接触>炭酸化抑制処理を施した供試体を35
℃、RH(相対湿度)100%でCO2濃度が10%に
保たれたインキュベーター内で、炭酸ガスと120時間
接触させた。 <吸着炭酸ガス量の測定>炭酸ガス接触させた供試体を
粉砕し、105℃で3時間乾燥させてから、供試体の1
gを精秤して5N−HClで溶解させ、発生するガスを
水上捕集し、供試体粉末1gあたりのガス発生量(A)
を測定した。また炭酸ガス接触処理を施していない供試
体粉末も同様の操作を行い、1gあたりのガス発生量
(B)を測定した。そして(A)−(B)の値を、炭酸
ガス接触処理により供試体1gが吸着した炭酸ガス量
(C)とした。結果を表1に示した。
(Examples 1 to 11 and Comparative Examples 1 to 4) <Specimen> As a sample of ALC, Shizukalite (trade name, manufactured by Onoda ELC Co., Ltd.) (porosity of 85 to 8)
7%) was cut into 2 × 2 × 3 cm and used. <Carbonation Inhibition Treatment with Basic Organic Acid Aluminum Salt Solution> A basic organic aluminum acid salt solution having a predetermined concentration was immersed in the test sample for 1 minute, and then dried in a dryer at 105 ° C. for 5 hours. <Contact with carbon dioxide> 35 specimens subjected to carbonation suppression treatment
It was brought into contact with carbon dioxide for 120 hours in an incubator in which the CO 2 concentration was kept at 10% at 100 ° C. and RH (relative humidity). <Measurement of Amount of Adsorbed Carbon Dioxide Gas> The specimen that has been brought into contact with carbon dioxide gas is crushed and dried at 105 ° C. for 3 hours.
g is precisely weighed and dissolved with 5N-HCl, the generated gas is collected on water, and the amount of gas generated per 1 g of the sample powder (A)
Was measured. In addition, the same operation was performed on the sample powder that had not been subjected to the carbon dioxide gas contact treatment, and the amount of gas generated per gram (B) was measured. The value of (A)-(B) was defined as the amount of carbon dioxide (C) adsorbed by 1 g of the test sample by the carbon dioxide gas contact treatment. The results are shown in Table 1.

【0028】[0028]

【表1】 (注1)グリコール酸/乳酸(モル比)=0.1 (注2)グリコール酸/乳酸(モル比)=2.4 (注3)クエン酸/乳酸(モル比)=0.8 (注4)マレイン酸/乳酸(モル比)=1.2 (注5)Na2O換算濃度 (注6)CaO換算濃度[Table 1] (Note 1) Glycolic acid / lactic acid (molar ratio) = 0.1 (Note 2) Glycolic acid / lactic acid (molar ratio) = 2.4 (Note 3) Citric acid / lactic acid (molar ratio) = 0.8 (Note) 4) Maleic acid / lactic acid (molar ratio) = 1.2 (Note 5) Concentration in terms of Na 2 O (Note 6) Concentration in terms of CaO

【0029】表1から、本発明の炭酸化抑制剤を溶液に
してALCに接触含漬させることにより本発明抑制剤は
優れた炭酸化抑制効果を示すことが判る。また、本発明
の炭酸化抑制剤はアルミニウム塩であるため作業上安全
であった。
From Table 1, it can be seen that the inhibitor of the present invention exhibits an excellent effect of inhibiting carbonation by contacting and impregnating ALC with a solution of the carbonation inhibitor of the present invention. In addition, the carbonation inhibitor of the present invention was safe in work because it was an aluminum salt.

【0030】(実施例12〜18、比較例5〜7)次に
セメントコンクリートを供試体とした場合における、塩
基性有機酸アルミニウム塩の炭酸化抑制効果を示す。 <コンクリートブロック供試体>ポルトランドセメント
50重量部、けい砂50重量部に水24重量部を加え良
く混練し、2×2×8cm金型へ流し込み成型を行い、
室温で24時間養生した。その後脱型し、20℃、RH
60%の恒温恒湿器で7日間乾燥させ供試体を得た。 <塩基性有機酸アルミニウム塩溶液による炭酸化抑制処
理>所定濃度の塩基性有機酸アルミニウム塩溶液をスプ
レ−で供試体から10cm離して1分間ずつ全面に吹き
付けた後、10分間放置し、20℃、RH60%の恒温
恒湿器で7日間乾燥させた。 <炭酸ガス接触>炭酸化抑制処理を施した供試体を35
℃、RH100%でCO2濃度が10%に保たれたイン
キュベーター内で、炭酸ガスと7日間接触させた。 <吸着炭酸ガス量の測定>前記ALCの実施例と全く同
様にして吸着炭酸ガス量の測定を行った。
(Examples 12 to 18 and Comparative Examples 5 to 7) Next, the carbonation suppression effect of the basic organic acid aluminum salt in the case of using cement concrete as a specimen is shown. <Concrete block specimen> 50 parts by weight of Portland cement and 50 parts by weight of silica sand, 24 parts by weight of water were added and kneaded well. The mixture was poured into a 2 × 2 × 8 cm mold and molded.
Cured at room temperature for 24 hours. After that, it was released from the mold, and was heated at
The specimen was dried in a 60% constant temperature and humidity chamber for 7 days to obtain a test specimen. <Carbonation suppression treatment with basic organic acid aluminum salt solution> A basic organic acid aluminum salt solution having a predetermined concentration is sprayed on the entire surface at a distance of 10 cm from the test piece for 1 minute each, and then left for 10 minutes at 20 ° C. And RH60% in a thermo-hygrostat for 7 days. <Contact with carbon dioxide> 35 specimens subjected to carbonation suppression treatment
It was brought into contact with carbon dioxide for 7 days in an incubator kept at 10 ° C. and a CO 2 concentration of 10% at RH 100%. <Measurement of Amount of Adsorbed Carbon Dioxide> The amount of adsorbed carbon dioxide was measured in exactly the same manner as in the above-mentioned ALC example.

【0031】[0031]

【表2】 (注1)クエン酸/乳酸(モル比)=0.8 (注2)マレイン酸/乳酸(モル比)=1.2 (注3)CaO換算濃度 (注4)Na2O換算濃度 [Table 2] (Note 1) Citric acid / lactic acid (molar ratio) = 0.8 (Note 2) Maleic acid / lactic acid (molar ratio) = 1.2 (Note 3) CaO equivalent concentration (Note 4) Na 2 O equivalent concentration

【0032】表2から、本発明の塩基性有機酸アルミニ
ウム塩を溶液にしてポルトランドセメント等のモルタル
にスプレーすることによっても優れた炭酸化抑制効果を
発現することが判る。
From Table 2, it can be seen that an excellent carbonation inhibiting effect can be exhibited by spraying a solution of the basic organic acid aluminum salt of the present invention onto a mortar such as Portland cement.

【0033】[0033]

【発明の効果】本発明のコンクリートまたはモルタル用
炭酸化抑制剤は、塩基度10〜75%の範囲の塩基性有
機酸アルミニウム塩であって、溶液として使用する場合
0.5〜20重量%溶液にしてコンクリートまたはモル
タルに、10秒〜30分間浸漬させるかあるいはスプレ
ーで吹き付ける等の方法により、コンクリートまたはモ
ルタルに優れた炭酸化抑制効果を発現する。本発明の炭
酸化抑制剤はアルミニウム塩であるから作業上の安全性
にも優れている。
The carbonation inhibitor for concrete or mortar of the present invention is a basic organic acid aluminum salt having a basicity of 10 to 75%, and when used as a solution, a 0.5 to 20% by weight solution. The concrete or mortar can be immersed in the concrete or mortar for 10 seconds to 30 minutes, or sprayed with a spray or the like to exhibit an excellent effect of suppressing carbonation in the concrete or mortar. Since the carbonation inhibitor of the present invention is an aluminum salt, it is excellent in operational safety.

【0034】また、塩基性有機酸アルミニウム塩の有機
酸が乳酸の場合、あるいは乳酸と乳酸以外の有機酸から
なり、乳酸以外の有機酸/乳酸のモル比が0.1〜2.
4の範囲にある場合はコンクリートまたはモルタルに対
し特に優れた炭酸化抑制効果を現す。
When the organic acid of the basic organic acid aluminum salt is lactic acid, or is composed of lactic acid and an organic acid other than lactic acid, the molar ratio of organic acid other than lactic acid / lactic acid is 0.1 to 2.
When it is in the range of 4, a particularly excellent effect of suppressing carbonation on concrete or mortar is exhibited.

【0035】しかも、本発明の炭酸化抑制剤は、安価で
容易に製造することができるから極めて優れたものであ
る。
Moreover, the carbonation inhibitor of the present invention is very excellent because it can be easily produced at low cost.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 塩基度10〜75%の範囲の塩基性有機
酸アルミニウム塩からなるコンクリートまたはモルタル
用炭酸化抑制剤。
1. A carbonation inhibitor for concrete or mortar, comprising a basic organic acid aluminum salt having a basicity of 10 to 75%.
【請求項2】 塩基性有機酸アルミニウム塩が塩基性乳
酸アルミニウム塩である請求項1の炭酸化抑制剤。
2. The carbonation inhibitor according to claim 1, wherein the basic organic acid aluminum salt is a basic aluminum lactate salt.
【請求項3】 塩基性有機酸アルミニウム塩の有機酸が
乳酸と乳酸以外の有機酸から構成され、かつ、乳酸以外
の有機酸/乳酸(モル比)=0.1〜2.4の範囲にあ
る請求項1の炭酸化抑制剤。
3. The organic acid of a basic organic acid aluminum salt is composed of lactic acid and an organic acid other than lactic acid, and an organic acid other than lactic acid / lactic acid (molar ratio) = 0.1 to 2.4. A carbonation inhibitor according to claim 1.
JP3554897A 1997-02-03 1997-02-03 Carbonation-suppressant for concrete or mortar Pending JPH10218687A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3554897A JPH10218687A (en) 1997-02-03 1997-02-03 Carbonation-suppressant for concrete or mortar

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3554897A JPH10218687A (en) 1997-02-03 1997-02-03 Carbonation-suppressant for concrete or mortar

Publications (1)

Publication Number Publication Date
JPH10218687A true JPH10218687A (en) 1998-08-18

Family

ID=12444790

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3554897A Pending JPH10218687A (en) 1997-02-03 1997-02-03 Carbonation-suppressant for concrete or mortar

Country Status (1)

Country Link
JP (1) JPH10218687A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026158A1 (en) * 1998-10-29 2000-05-11 Mcc Materials Incorporated Method for protecting and consolidating calcareous materials
US6398945B1 (en) 1999-07-22 2002-06-04 Infrastructure Repair Technologies, Inc. Method of treating corrosion in reinforced concrete structures by providing a uniform surface potential
JP2012131744A (en) * 2010-12-22 2012-07-12 Taki Chem Co Ltd Basic aluminum lactate aqueous solution and production method of the same
KR101535862B1 (en) * 2013-09-25 2015-07-10 (주) 선엔지니어링종합건축사사무소 the method for preventing carbonization of concrete using the refined cooking oil

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000026158A1 (en) * 1998-10-29 2000-05-11 Mcc Materials Incorporated Method for protecting and consolidating calcareous materials
US6296905B1 (en) * 1998-10-29 2001-10-02 Mmc Materials, Incorporated Method for protecting and consolidating calcareous materials
US6398945B1 (en) 1999-07-22 2002-06-04 Infrastructure Repair Technologies, Inc. Method of treating corrosion in reinforced concrete structures by providing a uniform surface potential
JP2012131744A (en) * 2010-12-22 2012-07-12 Taki Chem Co Ltd Basic aluminum lactate aqueous solution and production method of the same
KR101535862B1 (en) * 2013-09-25 2015-07-10 (주) 선엔지니어링종합건축사사무소 the method for preventing carbonization of concrete using the refined cooking oil

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