JPH09208279A - Admixture - Google Patents
AdmixtureInfo
- Publication number
- JPH09208279A JPH09208279A JP1323796A JP1323796A JPH09208279A JP H09208279 A JPH09208279 A JP H09208279A JP 1323796 A JP1323796 A JP 1323796A JP 1323796 A JP1323796 A JP 1323796A JP H09208279 A JPH09208279 A JP H09208279A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- sulfate
- admixture
- cement
- mortar
- 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
Links
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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0004—Compounds chosen for the nature of their cations
- C04B2103/001—Alkaline earth metal or Mg-compounds
- C04B2103/0011—Ba
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2015—Sulfate resistance
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、混和剤に関し、特
に硫酸塩に対して耐久性の必要なモルタルやコンクリー
トに配合することができる混和剤に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an admixture, and more particularly to an admixture which can be added to mortar or concrete which is required to have durability against sulfate.
【０００２】[0002]
【従来の技術】通常の普通ポルトランドセメント、早強
ポルトランドセメントを用いたコンクリート２．５％Ｍ
ｇＳＯ4溶液に浸漬した場合、３００日程度で膨張によ
り破壊されることが知られている。中庸熱ポルトランド
セメントを用いた場合にも５００日強程度で破壊され
る。これは、コンクリート中に硫酸塩が浸透して作用す
ると、エトリンガイトを生成し、コンクリートを膨張破
壊させるためである。2. Description of the Related Art 2.5% M concrete using normal ordinary Portland cement and early strength Portland cement
It is known that when immersed in a gSO 4 solution, it is destroyed by expansion in about 300 days. Even if medium heat Portland cement is used, it will be destroyed in about 500 days. This is because when sulphate penetrates into concrete and acts on it, ettringite is generated and the concrete expands and breaks.
【０００３】そこで、耐硫酸塩抵抗性が必要とされるモ
ルタルやコンクリートとしては、硫酸塩との反応源とな
るセメント中のＣ3Ａの量を４％以下にした特殊な耐硫
酸塩ポルトランドセメントの使用が知られている。しか
し、該耐硫酸塩セメントは、流通量が少なく、しかも高
価であるために一般的にはあまり使用されていないのが
実状である。Therefore, as a mortar or concrete which requires sulfate resistance, a special sulfate-resistant Portland cement in which the amount of C 3 A in the cement as a reaction source with sulfate is 4% or less. The use of is known. However, the sulfate-resistant cement is generally not used much because it has a small amount of circulation and is expensive.
【０００４】従って、このような耐硫酸塩抵抗性が要求
されるモルタルやコンクリートの場合、該モルタルやコ
ンクリート中に硫酸塩が浸透しないように、表面にエポ
キシ樹脂、ビニル樹脂、ポリエステル樹脂等を塗布して
表面被覆する方法が実施されている。しかし、該表面被
覆方法も工程が煩雑であり、しかも前記耐硫酸塩セメン
トほどではないがコスト高になるのは免れない。Therefore, in the case of mortar or concrete which is required to have such sulfate resistance, epoxy resin, vinyl resin, polyester resin or the like is applied to the surface so that the sulfate does not penetrate into the mortar or concrete. Then, the method of coating the surface is carried out. However, the surface coating method also involves complicated steps, and the cost is inevitably higher than that of the sulfate resistant cement.
【０００５】[0005]
【発明が解決しようとする課題】従って、本発明の目的
は、通常の普通ポルトランドセメント、早強ポルトラン
ドセメント等を用いたモルタルやコンクリートに耐硫酸
塩抵抗性を安価で且つ容易に付与することができる混和
剤を提供することにある。Therefore, an object of the present invention is to easily and inexpensively provide sulfate resistance to mortar and concrete using ordinary ordinary Portland cement, early-strength Portland cement and the like. It is to provide an admixture that can.
【０００６】[0006]
【課題を解決するための手段】本発明によれば、モルタ
ル、コンクリートに耐硫酸塩抵抗性を付与する混和剤で
あって、水溶性バリウム塩を有効成分として含有するこ
とを特徴とする混和剤が提供される。According to the present invention, an admixture for imparting sulfate resistance to mortar and concrete, characterized by containing a water-soluble barium salt as an active ingredient. Will be provided.
【０００７】[0007]
【発明の形態】本発明の混和剤は、有効成分として、水
酸化バリウム、塩化バリウム、炭酸バリウム等の水溶性
バリウム塩を含有する。これらの水溶性バリウム塩は水
和物であっても良い。特に水酸化バリウム又はその水和
物が好ましい。この有効成分は、モルタルやコンクリー
トが硫酸塩環境下に暴露された場合に、浸透してくる硫
酸塩とバリウムイオンとが反応し、難溶性の硫酸バリウ
ム塩を生成し、硫酸塩によるモルタルやコンクリートの
化学的腐食を低減させるよう作用する。DETAILED DESCRIPTION OF THE INVENTION The admixture of the present invention contains a water-soluble barium salt such as barium hydroxide, barium chloride or barium carbonate as an active ingredient. These water-soluble barium salts may be hydrates. Particularly preferred is barium hydroxide or its hydrate. When the mortar or concrete is exposed to a sulfate environment, this active ingredient reacts with the permeating sulfate and barium ion to form a sparingly soluble barium sulfate salt, and the mortar or concrete with the sulfate salt. Acts to reduce the chemical corrosion of.
【０００８】本発明の混和剤の形態は、特に限定される
ものではなく、有効成分をモルタルやコンクリート組成
物中に混合しても、また水等の適当な溶媒に希釈して液
状とすることもできる。The form of the admixture of the present invention is not particularly limited, and it is possible to mix the active ingredient into a mortar or concrete composition, or to dilute it into an appropriate solvent such as water to form a liquid. You can also
【０００９】本発明の混和剤の配合割合は、有効成分中
のバリウム換算で、モルタルやコンクリート組成物中の
セメント１００重量部に対して、０．５〜２０重量部、
特に１〜５重量部が好ましい。２０重量部を超える場合
には硬化不良やコストアップの恐れがあるので好ましく
ない。The admixture ratio of the admixture of the present invention is, in terms of barium in the active ingredient, 0.5 to 20 parts by weight, based on 100 parts by weight of cement in the mortar or concrete composition.
Particularly, 1 to 5 parts by weight is preferable. If it exceeds 20 parts by weight, there is a risk of defective curing or increased cost, which is not preferable.
【００１０】本発明の混和剤を配合するモルタルやコン
クリートは、セメント成分として通常の普通ポルトラン
ドセメント、早強ポルトランドセメント、中庸熱ポルト
ランドセメント、高炉セメント、フライアッシュセメン
ト等の種々のセメントを用いたものに適用することがで
きる。その他の水、骨材、細骨材等の配合量は、従来と
同様の範囲で行うことができる他、通常モルタルやコン
クリートに配合される高性能減水剤、ＡＥ材等の他の混
和剤や混和材料を併用することもできる。The mortar and concrete containing the admixture of the present invention use various cements such as ordinary ordinary Portland cement, early-strength Portland cement, moderate heat Portland cement, blast furnace cement and fly ash cement as cement components. Can be applied to. Other water, aggregate, fine aggregate, etc. can be compounded within the same range as in the past, and other high-performance water reducing agents usually mixed with mortar or concrete, other admixtures such as AE materials, etc. Admixtures can also be used together.
【００１１】[0011]
【発明の効果】本発明の混和剤は、有効成分として水溶
性バリウム塩を含有するので、モルタルやコンクリート
に硫酸塩が浸入した際のエトリンガイトの生成を抑制
し、該エトリンガイトの生成に起因する膨張・破壊を防
止して耐硫酸塩抵抗性を容易に且つ安価に付与すること
ができる。EFFECT OF THE INVENTION Since the admixture of the present invention contains a water-soluble barium salt as an active ingredient, it suppresses the formation of ettringite when sulfate penetrates into mortar and concrete, and expands due to the formation of the ettringite. -It is possible to prevent breakage and to easily provide sulfate resistance with low cost.
【００１２】[0012]
【実施例】以下、実施例及び比較例により更に詳細に説
明するが、本発明はこれらに限定されるものではない。The present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto.
【００１３】[0013]
【実施例１】セメント２０００重量部、水１３００重量
部、砂４０００重量部に、水酸化バリウム８水和物（Ｂ
ａ(ＯＨ)2・８Ｈ2Ｏ）４６重量部を添加して、モルタル
ミキサーにて混練した。得られた混練物を４ｃｍ×４ｃ
ｍ×１６ｃｍの型枠に注入し、２０℃一定に保持して硬
化させた。２４時間後脱型して供試体を得た後、該供試
体を密閉容器中の水に浸漬し、２０℃に保持して２８日
間養生した。Example 1 Cement 2000 parts by weight, water 1300 parts by weight, sand 4000 parts by weight, barium hydroxide octahydrate (B
46 parts by weight of a (OH) 2 .8H 2 O) were added and kneaded with a mortar mixer. The obtained kneaded product is 4 cm x 4 c
It was poured into a m × 16 cm mold and kept at 20 ° C. and cured. After 24 hours, it was demolded to obtain a specimen, which was then immersed in water in a closed container and kept at 20 ° C. for 28 days for curing.
【００１４】次いで、養生後の供試体の外面に、１面だ
け残してエポキシ樹脂をコーティングした後、１０％の
硫酸ナトリウム溶液中に３月間浸漬した。浸漬後の供試
体のエポキシ樹脂をコーティングしていない面を電子顕
微鏡元素分析装置（ＥＰＭＡ）（日本電子（株）製）に
よりイオウの浸透深さを測定した。浸透深さは、初期材
令のイオウ濃度（０．７％）より濃度が増加した深さを
測定した。その結果、浸透深さは約５ｍｍであり、また
イオウ浸透量をＥＰＭＡ写真の面積から計算したところ
６％以下であった。Next, the outer surface of the cured specimen was coated with an epoxy resin leaving only one surface, and then immersed in a 10% sodium sulfate solution for 3 months. The penetration depth of sulfur was measured by an electron microscope elemental analyzer (EPMA) (manufactured by JEOL Ltd.) on the surface of the test piece after immersion that was not coated with the epoxy resin. As the penetration depth, the depth at which the concentration increased from the sulfur concentration (0.7%) of the initial age was measured. As a result, the penetration depth was about 5 mm, and the amount of sulfur penetration was 6% or less when calculated from the area of the EPMA photograph.
【００１５】[0015]
【比較例１】水酸化バリウム８水和物（Ｂａ(ＯＨ)2・
８Ｈ2Ｏ）４６重量部を配合しない以外は、実施例１と
同様に供試体を得、イオウの浸透深さを測定した。その
結果、浸透深さは約１０ｍｍであり、またイオウ浸透量
をＥＰＭＡ写真の面積から計算したところ１０％以上で
あった。Comparative Example 1 Barium hydroxide octahydrate (Ba (OH) 2 ·
8H 2 O) except that 46 parts by weight of (8H 2 O) was not added, and a sample was obtained in the same manner as in Example 1 and the penetration depth of sulfur was measured. As a result, the penetration depth was about 10 mm, and when the sulfur penetration amount was calculated from the area of the EPMA photograph, it was 10% or more.
Claims (1)
性を付与する混和剤であって、水溶性バリウム塩を有効
成分として含有することを特徴とする混和剤。1. An admixture for imparting sulfate resistance to mortar and concrete, comprising a water-soluble barium salt as an active ingredient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1323796A JPH09208279A (en) | 1996-01-29 | 1996-01-29 | Admixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1323796A JPH09208279A (en) | 1996-01-29 | 1996-01-29 | Admixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09208279A true JPH09208279A (en) | 1997-08-12 |
Family
ID=11827595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1323796A Pending JPH09208279A (en) | 1996-01-29 | 1996-01-29 | Admixture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09208279A (en) |
-
1996
- 1996-01-29 JP JP1323796A patent/JPH09208279A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050408 |
|
| A131 | Notification of reasons for refusal |
Effective date: 20050412 Free format text: JAPANESE INTERMEDIATE CODE: A131 |
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| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20050823 |