JPH0761845A - Hydrated and hardened material - Google Patents
Hydrated and hardened materialInfo
- Publication number
- JPH0761845A JPH0761845A JP24191693A JP24191693A JPH0761845A JP H0761845 A JPH0761845 A JP H0761845A JP 24191693 A JP24191693 A JP 24191693A JP 24191693 A JP24191693 A JP 24191693A JP H0761845 A JPH0761845 A JP H0761845A
- Authority
- JP
- Japan
- Prior art keywords
- hydrated
- calcium
- cured product
- carbonation
- concrete
- 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
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
- C04B9/00—Magnesium cements or similar cements
- C04B9/11—Mixtures thereof with other inorganic cementitious materials
- C04B9/12—Mixtures thereof with other inorganic cementitious materials with hydraulic cements, e.g. Portland cements
-
- 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
- C04B2111/22—Carbonation resistance
Abstract
Description
【０００１】[0001]
【産業上の分野】本発明は、炭酸化に抵抗力のある水和
硬化体に関する。FIELD OF THE INVENTION The present invention relates to a hydrated cured product which is resistant to carbonation.
【０００２】[0002]
【従来の技術とその問題点】従来の炭酸化防止の技術
は、硬化体への塗料の塗布による炭酸ガスの遮断、水和
硬化体の緻密化による炭酸ガス進入阻害、また硬化体へ
の樹脂の混入または含浸であった。しかし、これらはい
ずれも水和硬化体自体の性質に言及するものではなかっ
た。2. Description of the Related Art The conventional technology for preventing carbonation is to block carbon dioxide gas by coating a hardened material with a coating material, inhibit carbon dioxide gas invasion by densification of a hydrated hardened material, and resin for hardened material. Was mixed or impregnated. However, none of these refers to the properties of the hydrated cured product itself.
【０００３】コンクリート材料は、本来アルカリ性を示
すが、炭酸化により中性となりコンクリート中の鉄筋を
錆させ、材料破壊に至らせる。コンクリートの炭酸化は
アルカリ骨材反応と同様にコンクリート劣化の大きな原
因となっている。材料が中性を示すＡＬＣでは、炭酸化
により材料の収縮率が１％以上となりこれも材料破壊に
つながる。また、ケイ酸カルシウム系保温材では、炭酸
化による密度の上昇と空隙率の上昇により熱伝導率の上
昇化が進む。Although concrete materials are basically alkaline, they become neutral due to carbonation, which causes the reinforcing bars in the concrete to rust, leading to material destruction. Carbonation of concrete is a major cause of concrete deterioration as well as alkali-aggregate reaction. In ALC in which the material is neutral, the contraction rate of the material becomes 1% or more due to carbonation, which also leads to material destruction. In addition, in the calcium silicate-based heat insulating material, the thermal conductivity increases due to the increase in density and the increase in porosity due to carbonation.
【０００４】発電所、工場、住宅等の内部において、炭
酸ガスの多く含まれた雰囲気に直接触れる水和硬化体部
分（コンクリート、ケイカル板等）は、炭酸化による炭
酸化劣化が著しい。このような部分は、施工やコストの
関係からも水和硬化体への炭酸化劣化に対する処置をと
ることが困難となる場合がある。また近年、省エネが進
むにつれ、建築材料や無機断熱材料の低熱伝導率化が要
求されるようになってきた。そのためには材料の軽量化
による低熱伝導率化が要求されている。その要求に答え
てＡＬＣ、軽量コンクリート、軽量気泡コンクリート、
ケイ酸カルシウム保温材等が開発された。しかし、材料
の低密度化により、炭酸ガスの進入への抵抗力が小さく
なり、炭酸化の促進に都合のよい材料となっている。し
かし、これに対する手段は、塗料等によるシール、樹脂
含浸による方法が残されるのみとなり、材料の本質を変
える方法は考えられてはいない。[0004] Inside a power plant, a factory, a house, etc., a hydrated hardened body portion (concrete, a calcareous plate, etc.) that is in direct contact with an atmosphere containing a large amount of carbon dioxide is markedly deteriorated by carbonation. In such a part, it may be difficult to take measures against carbonation deterioration of the hydrated cured product in terms of construction and cost. Further, in recent years, with the progress of energy saving, it has been required to reduce the thermal conductivity of building materials and inorganic heat insulating materials. For that purpose, it is required to reduce the heat conductivity by reducing the weight of the material. In response to the request, ALC, lightweight concrete, lightweight cellular concrete,
Calcium silicate heat insulating material was developed. However, due to the low density of the material, the resistance to the invasion of carbon dioxide gas becomes small, and the material is suitable for promoting carbonation. However, as a means for this, only a method of sealing with a paint or impregnation with a resin is left, and a method of changing the essence of the material has not been considered.
【０００５】ポルトランドセメントは、水和硬化体の製
造時に使用されるが、その成分に酸化マグネシウム（Ｍ
ｇＯ）が含有している場合、水和反応により徐々に水酸
化マグネシウム（Ｍｇ（ＯＨ）２）へと変化する。この
とき体積が膨張し、水和硬化体自体が破壊する。一般に
５％以上の酸化マグネシウムが含有されている場合、こ
の膨張破壊が起こる。ポルトランドセメントに含有され
る酸化マグネシウム量は、ＪＩＳにより５％以下と規定
されており、市販のポルトランドセメントは一般に、３
％以下の酸化マグネシウム（含有する酸化カルシウムに
対して約５％以下）を含有している。また、水蒸気養生
等の特殊な条件下での養生の場合、２％の酸化マグネシ
ウムの含有によっても、体積膨張による破壊が起こる。
したがって現在まで、ポルトランドセメントへのマグネ
シウム化合物の添加による炭酸化への影響は、まったく
検討されておらず、水和硬化体への適用もされていなか
った。[0005] Portland cement is used in the production of a hydrated cured product, and its component is magnesium oxide (M
When gO) is contained, it gradually changes into magnesium hydroxide (Mg (OH) 2 ) by the hydration reaction. At this time, the volume expands and the hydrated cured product itself is destroyed. Generally, when 5% or more of magnesium oxide is contained, this expansion failure occurs. The amount of magnesium oxide contained in Portland cement is specified by JIS to be 5% or less, and commercially available Portland cement is generally 3% or less.
% Magnesium oxide (about 5% or less based on calcium oxide contained). Further, in the case of curing under special conditions such as steam curing, the destruction due to volume expansion occurs even when the content of magnesium oxide is 2%.
Therefore, up to now, the effect of carbonation by the addition of a magnesium compound to Portland cement has not been studied at all, and has not been applied to a hydrated body.
【０００６】[0006]
【発明が解決しようとする問題点】現在ポルトランダイ
トまたは、ケイ酸カルシウム水和物類を含んだ水和硬化
体の炭酸化を阻止することは、炭酸ガスを含んだ雰囲気
中では不可能である。したがって、炭酸ガスの進入阻止
という方法を用いて炭酸化防止を行っている。しかし、
その方法ではコストや作業性、施工性の不都合が生じる
場合がある。したがって、水和硬化体自身の耐炭酸化性
能の向上が非常に重要な項目となった。Problems to be Solved by the Invention At present, it is impossible to prevent carbonation of a portlandite or a hydrated cured product containing calcium silicate hydrates in an atmosphere containing carbon dioxide gas. is there. Therefore, carbonation is prevented by using a method of preventing carbon dioxide from entering. But,
This method may cause inconveniences in cost, workability, and workability. Therefore, improvement of carbonation resistance of the hydrated cured product itself has become a very important item.
【０００７】[0007]
【問題点を解決するための手段】この問題解決のため実
験を重ねた結果、水和硬化体の炭酸化の速度を、水酸化
マグネシウムの添加により抑制できることを発見し、問
題を解決するに至った。発明者は、水酸化マグネシウム
により水和硬化体の炭酸化の速度が小さくなるととも
に、水和硬化体製造時に水酸化マグネシウムを混入する
ことにより、水和硬化体の体積膨張問題を解決した。以
下に本発明の詳細をさらに説明する。[Means for Solving Problems] As a result of repeated experiments for solving this problem, it was discovered that the rate of carbonation of the hydrated cured product could be suppressed by adding magnesium hydroxide, and the problem was solved. It was The inventor has solved the volume expansion problem of a hydrated cured product by reducing the carbonation rate of the hydrated cured product by magnesium hydroxide and by mixing magnesium hydroxide during the production of the hydrated cured product. Hereinafter, the details of the present invention will be further described.
【０００８】水和硬化体に含有されるカルシウム化合物
は、炭酸ガスとの反応により炭酸カルシウムを生成す
る。この現象を炭酸化という。この炭酸化を起こすよう
な物質には、例えばポルトランダイト、エトリンガイ
ト、またはＣＳＨ−Ｉ、ＣＳＨ−ＩＩ、トバモライトや
ゾノトライトなどがある。本発明は、炭酸カルシウム結
晶の生成を金属イオンの添加効果により阻害することを
応用しているものである。The calcium compound contained in the hydrated product produces calcium carbonate by reacting with carbon dioxide gas. This phenomenon is called carbonation. Examples of substances that cause this carbonation include portlandite, ettringite, CSH-I, CSH-II, tobermorite, and xonotlite. The present invention applies the inhibition of the formation of calcium carbonate crystals by the effect of adding metal ions.
【０００９】炭酸化のメカニズムはやや詳しく説明する
と以下のようになる。水和硬化体が雰囲気中の炭酸ガス
に曝されることにより、水和硬化体内部に、炭酸ガス雰
囲気が侵入する。炭酸ガスは、水和硬化体の成分中のカ
ルシウム水和物と水を介在して反応する。カルシウム水
和物は、分解し、炭酸カルシウムが生成する。さらに炭
酸カルシウムの結晶成長により炭酸カルシウム結晶が成
長する。炭酸カルシウムの結晶成長にともない、水和硬
化体の固体部に収縮がおこる。The mechanism of carbonation will be described in detail below. When the hydrated cured body is exposed to carbon dioxide gas in the atmosphere, the carbon dioxide atmosphere penetrates into the hydrated cured body. Carbon dioxide gas reacts with calcium hydrate in the components of the hydrated product through water. Calcium hydrate decomposes to produce calcium carbonate. Furthermore, calcium carbonate crystals grow due to the crystal growth of calcium carbonate. With the crystal growth of calcium carbonate, the solid part of the hydrated product shrinks.
【００１０】ここで、炭酸カルシウムの生成は平衡反応
と考えることができる。系内が平衡状態であれば、水溶
液中の炭酸カルシウム濃度がある一定のレベルで安定す
る。さらに炭酸カルシウムの生成を促す場合、その炭酸
カルシウムが結晶成長をして安定になることが必要とな
る。この時、炭酸カルシウム結晶成長の速度を抑制する
のがＭｇイオンによる添加効果であり、これは一般に次
のように解釈されている。水酸化マグネシウムは、水溶
液中でＭｇイオンとＯＨイオンとに少量であるが電離す
る。このＭｇイオンは、炭酸ガスにより炭酸マグネシウ
ムとなる場合がある。炭酸カルシウムの結晶成長面のス
テップにこの添加イオンが付着する。付着したＭｇイオ
ンによりステップの移動が阻止されるため、炭酸カルシ
ウム結晶の成長速度が抑制される。Here, the production of calcium carbonate can be considered as an equilibrium reaction. When the system is in an equilibrium state, the concentration of calcium carbonate in the aqueous solution stabilizes at a certain level. Further, in order to promote the production of calcium carbonate, it is necessary for the calcium carbonate to undergo crystal growth and become stable. At this time, it is the addition effect of Mg ions that suppresses the rate of calcium carbonate crystal growth, and this is generally interpreted as follows. Magnesium hydroxide ionizes in the aqueous solution into Mg ions and OH ions, though in a small amount. This Mg ion may become magnesium carbonate due to carbon dioxide gas. This additional ion attaches to the step of the crystal growth surface of calcium carbonate. Since the attached Mg ions block the movement of steps, the growth rate of calcium carbonate crystals is suppressed.
【００１１】以上のように、本発明は添加による結晶成
長抑制効果を応用している。水和硬化体への応用は、特
に良く利用されるポルトランドセメントのＪＩＳ規定よ
りＭｇの含有量に制限があったため、見落とされてい
た。炭酸カルシウムの結晶成長の添加効果を最大限に引
き出すためには、Ｍｇイオンを多量に生成させる必要が
ある。そのため本発明の水和硬化体中に含有される水酸
化マグネシウムは、微細であることが要求される。好ま
しくは、平均粒径が１０μｍ以下であり、比表面積が１
０ｍ２／ｇ以上である。しかしながら、必ずしもこの範
囲に限定されるものではない。As described above, the present invention applies the crystal growth suppressing effect by the addition. The application to a hydrated cured product has been overlooked because the content of Mg is limited according to the JIS regulations of portland cement which is often used. In order to maximize the additive effect of calcium carbonate crystal growth, it is necessary to generate a large amount of Mg ions. Therefore, the magnesium hydroxide contained in the hydrated cured product of the present invention is required to be fine. Preferably, the average particle size is 10 μm or less and the specific surface area is 1
It is 0 m 2 / g or more. However, it is not necessarily limited to this range.
【００１２】本発明にて、水和硬化体に含有される水酸
化マグネシウムは、水和硬化体製造時または製造後に以
下の方法によっても生成する。酸化マグネシウム、酢酸
マグネシウム、シュウ酸マグネシウム、塩化マグネシウ
ム、硝酸マグネシウム、硫酸マグネシウム粉末またはそ
れらの水溶液等を水和硬化体製造時または製造後に加え
た場合、水和硬化体の水分や原料または水和硬化体中の
水分やカルシウム化合物と反応することにより、それぞ
れは水酸化マグネシウムとなる。したがって、本発明は
水和硬化体中に水酸化マグネシウムをカルシウム水和物
（酸化カルシウム換算）に対して５％以上含有されるこ
とを特徴としており、製造時または製造後に添加するマ
グネシウム化合物の種類には限定されるものではない。In the present invention, the magnesium hydroxide contained in the hydrated cured product is also produced by the following method during or after the production of the hydrated cured product. When magnesium oxide, magnesium acetate, magnesium oxalate, magnesium chloride, magnesium nitrate, magnesium sulfate powder or an aqueous solution thereof is added during or after the production of the hydrated cured product, the water content of the hydrated cured product or the raw material or hydration hardening By reacting with water and calcium compounds in the body, each becomes magnesium hydroxide. Therefore, the present invention is characterized in that the hydrated cured product contains magnesium hydroxide in an amount of 5% or more based on calcium hydrate (calculated as calcium oxide), and the kind of magnesium compound added during or after the production. Is not limited to.
【００１３】[0013]
【作用】本発明は、水和硬化体が炭酸化を受けたとき
に、炭酸カルシウムの結晶成長を水酸化マグネシウムの
添加効果により抑制することにより、炭酸化の速度抑制
をおこなうものである。このとき、水酸化マグネシウム
が水和硬化体中のポルトランダイト、エトリンガイト、
またはＣＳＨ−Ｉ、ＣＳＨ−ＩＩ、トバモライトやゾノ
トライトなどの炭酸化を起こすカルシウム化合物に計算
上含有される酸化カルシウムに対して５重量％以上含有
されることを特徴としている。上限に制限はないが、お
およそ８０重量％以上では水和硬化体の機械的強度が低
下するため、８０重量％以下が好ましい。また、水酸化
マグネシウムの大きさは、好ましくは、平均粒径が１０
μｍ以下である。しかしながら、必ずしもこの範囲に限
定されるものではない。The present invention suppresses the rate of carbonation by suppressing the crystal growth of calcium carbonate by the effect of adding magnesium hydroxide when the hydrated product is carbonated. At this time, magnesium hydroxide is a portlandite in the hydrated cured body, ettringite,
Alternatively, it is characterized by being contained in an amount of 5% by weight or more based on the calcium oxide calculated in CSH-I, CSH-II, calcium compounds that cause carbonation such as tobermorite and xonotlite. There is no upper limit, but if it is approximately 80% by weight or more, the mechanical strength of the hydrated cured product decreases, so 80% by weight or less is preferable. The size of the magnesium hydroxide is preferably such that the average particle size is 10
μm or less. However, it is not necessarily limited to this range.
【００１４】[0014]
【実施例】以下に実施例および比較例により、本発明を
さらに具体的に説明する。水和硬化体は、各原料を所定
の重量部数、所定の方法にて製造された後、炭酸化促進
試験に供せられた。製造された水和硬化体の大きさは４
ｃｍ×４ｃｍ×１６ｃｍである。そして炭酸化度測定用
に、供試体を２ｃｍ×２ｃｍ×２ｃｍに切断して試験に
供した。また、水和硬化体のうちモルタル、コンクリー
トは、中性化深さについて試験を行った。中性化深さ測
定用の水和硬化体の大きさは１０ｃｍ×１０ｃｍ×４０
ｃｍである。EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples. The hydrated cured product was subjected to a carbonation accelerating test after being manufactured by a predetermined method with a predetermined number of parts by weight of each raw material. The size of the hydrated cured product produced is 4
It is cm × 4 cm × 16 cm. Then, for measuring the carbonation degree, the test piece was cut into 2 cm × 2 cm × 2 cm and used for the test. Moreover, mortar and concrete of the hydrated cured products were tested for the neutralization depth. The size of the hydrated cured product for measuring the neutralization depth is 10 cm × 10 cm × 40
cm.
【００１５】炭酸化促進試験の条件は、炭酸ガス濃度５
％、温度２５℃、湿度７０％である。１４日間の炭酸化
促進試験後に水和硬化体の炭酸化度を測定した。炭酸化
度とは、水和硬化体中のカルシウム分がすべて炭酸カル
シウムとなったときを炭酸化度１００としてあらわす。
炭酸化度の測定方法は、塩酸処理時の炭酸ガス発生量か
ら算出した。また、モルタル、コンクリートの水和硬化
体は、中性化深さ試験に供した。炭酸化促進試験の条件
は、炭酸ガス濃度５％、温度２５℃、湿度７０％であ
る。１４日間の炭酸化促進試験後に水和硬化体を供試体
中央付近で割り、破断面にフェノールフタレイン１％エ
チルアルコール溶液を塗布し、中性化深さを測定した。
水和硬化体がアルカリ性である部分は破断面が赤色とな
るが、炭酸化により中性となっている部分は変色しな
い。The conditions for the carbonation promotion test are that the carbon dioxide concentration is 5
%, Temperature 25 ° C., humidity 70%. After the carbonation acceleration test for 14 days, the carbonation degree of the hydrated cured product was measured. The carbonation degree is expressed as a carbonation degree of 100 when all the calcium components in the hydrated cured body become calcium carbonate.
The method of measuring the carbonation degree was calculated from the amount of carbon dioxide gas generated during the treatment with hydrochloric acid. The mortar and concrete hydrated products were subjected to a neutralization depth test. The conditions for the carbonation promotion test are a carbon dioxide concentration of 5%, a temperature of 25 ° C., and a humidity of 70%. After the carbonation acceleration test for 14 days, the hydrated cured product was divided around the center of the test sample, and a 1% phenolphthalein ethyl alcohol solution was applied to the fracture surface to measure the neutralization depth.
The fractured surface becomes red in the portion where the hydrated cured body is alkaline, but the portion which becomes neutral due to carbonation does not discolor.
【００１６】実施例１ ポルトランダイト（水酸化カルシウム）に水酸化マグネ
シウムを３．５、５、１０、１５、３０、６０重量部そ
れぞれ混合したものを作製し、水を少量添加して硬化
し、それぞれの成形体を得た。作製された水和硬化体は
気乾乾燥され、炭酸化促進試験に供された。試験結果を
表１の１〜６に示す。 比較例１ 水酸化マグネシウムを添加しない点以外、実施例１と同
様に水和硬化体を得た。試験結果は、実施例１とともに
表１の７に示す。Example 1 Portlandite (calcium hydroxide) was mixed with 3.5, 5, 10, 15, 30, and 60 parts by weight of magnesium hydroxide, and a small amount of water was added to cure the mixture. , Each molded body was obtained. The produced hydrated cured product was air-dried and subjected to a carbonation acceleration test. The test results are shown in Tables 1 to 6. Comparative Example 1 A hydrated product was obtained in the same manner as in Example 1 except that magnesium hydroxide was not added. The test results are shown in Table 1 along with Example 1.
【００１７】実施例２ 水酸化カルシウムと二酸化ケイ素をモル比で１：１に混
合し、固体部１重量に対し水５重量部を加え、温度２１
０℃、飽和水蒸気圧２０ｋｇ／ｃｍ２、２時間にて攪拌
式オートクレーブを使用しゾノトライト・トバモライト
を主とするスラリーを合成した。このゾノトライト・ト
バモライトスラリーに水酸化マグネシウムをそれぞれ
２．５、５、１０、２０重量部加え、良く混合し、２５
ｋｇ／ｃｍ２の圧力で加圧脱水し、成形体を得た。作製
された水和硬化体は気乾乾燥され、炭酸化促進試験に供
された。試験結果を表２の１〜４に示す。 比較例２ 水酸化マグネシウムを添加しない点以外、実施例２と同
様に水和硬化体を得た。試験結果は、実施例２とともに
表２の５に示す。Example 2 Calcium hydroxide and silicon dioxide were mixed at a molar ratio of 1: 1 and 5 parts by weight of water was added to 1 part by weight of solids.
A slurry mainly composed of xonotlite tobermorite was synthesized using a stirring autoclave at 0 ° C. and a saturated steam pressure of 20 kg / cm 2 for 2 hours. To this zonotolite / tobermorite slurry, 2.5, 5, 10 and 20 parts by weight of magnesium hydroxide were added, respectively, and mixed well.
Pressure dehydration was performed at a pressure of kg / cm 2 to obtain a molded body. The produced hydrated cured product was air-dried and subjected to a carbonation acceleration test. The test results are shown in Tables 1 to 4. Comparative Example 2 A hydrated cured product was obtained in the same manner as in Example 2 except that magnesium hydroxide was not added. The test results are shown in Table 2 along with Example 2.
【００１８】実施例３ ポルトランドセメント、消石灰、ケイ砂、セッコウ、ア
ルミナセメント、およびＡｌ粉末と１、２、５、１０、
２０重量部の水酸化マグネシウムを所定の量、水を攪拌
しながら加え、スラリーとした後、型枠に流し込んだ。
固化した成形体を脱型し、温度１８０℃、飽和水蒸気圧
１０ｋｇ／ｃｍ２にて、８時間オートクレーブ養生し
た。得られた水和硬化体は気乾乾燥され、炭酸化促進試
験に供された。試験結果を表３の１〜５に示す。 比較例３ 水酸化マグネシウムを添加しない点以外、実施例３と同
様に水和硬化体を得た。試験結果は、実施例３とともに
表３の６に示す。Example 3 Portland cement, slaked lime, silica sand, gypsum, alumina cement, and Al powders 1, 2, 5, 10,
A predetermined amount of 20 parts by weight of magnesium hydroxide was added with stirring water to make a slurry, which was then poured into a mold.
The solidified molded body was demolded, and autoclaved at a temperature of 180 ° C. and a saturated steam pressure of 10 kg / cm 2 for 8 hours. The obtained hydrated cured product was air-dried and subjected to a carbonation acceleration test. The test results are shown in Tables 1 to 5. Comparative Example 3 A hydrated product was obtained in the same manner as in Example 3 except that magnesium hydroxide was not added. The test results are shown in Table 3 along with Example 3.
【００１９】実施例４ ポルトランドセメント、細骨材（砂）を用い、１．５、
２、５、１０、２０重量部の水酸化マグネシウムをそれ
ぞれ所定の量添加したモルタルを作製した。作製した水
和硬化体は、所定の炭酸化促進試験後に中性化深さを測
定した。試験結果を表４の１〜５に示す。 比較例４ 水酸化マグネシウムを添加しない点以外、実施例４と同
様に水和硬化体を得た。試験結果は、実施例４とともに
表４の６に示す。Example 4 Using Portland cement and fine aggregate (sand), 1.5
Mortars containing 2, 5, 10, and 20 parts by weight of magnesium hydroxide added in predetermined amounts were produced. The neutralized depth of the produced hydrated cured product was measured after a predetermined carbonation acceleration test. The test results are shown in Tables 1 to 5. Comparative Example 4 A hydrated product was obtained in the same manner as in Example 4 except that magnesium hydroxide was not added. The test results are shown in Table 4 along with Example 4.
【００２０】実施例５ 普通ポルトランドセメント、粗骨材（砂利）、細骨材
（砂）を用い、２、５、１０、２０重量部の水酸化マグ
ネシウムをそれぞれ所定の量添加したコンクリートを作
製した。作製した水和硬化体は、所定の炭酸化促進試験
後に中性化深さを測定した。試験結果を表５の１〜４に
示す。 比較例５ 水酸化マグネシウムを添加しない点以外、実施例５と同
様に水和硬化体を得た。試験結果は、実施例５とともに
表５の５に示す。Example 5 Using normal Portland cement, coarse aggregate (gravel) and fine aggregate (sand), 2,5,10,20 parts by weight of magnesium hydroxide was added in a predetermined amount to prepare concrete. . The neutralized depth of the produced hydrated cured product was measured after a predetermined carbonation acceleration test. The test results are shown in Tables 1 to 4. Comparative Example 5 A hydrated product was obtained in the same manner as in Example 5, except that magnesium hydroxide was not added. The test results are shown in Table 5 along with Example 5.
【００２１】実施例６ 普通ポルトランドセメント、パーライト、シリカヒュー
ムを用い、４、１０、２０、４０重量部の水酸化マグネ
シウムをそれぞれ所定の量添加した高強度軽量コンクリ
ートを作製した。作製した水和硬化体は、所定の炭酸化
促進試験後に中性化深さを測定した。試験結果を表６の
１〜４に示す。 比較例６ 水酸化マグネシウムを添加しない点以外、実施例６と同
様に水和硬化体を得た。試験結果は、実施例６とともに
表６の５に示す。Example 6 A high-strength lightweight concrete was prepared by adding 4, 10, 20, 40 parts by weight of magnesium hydroxide in predetermined amounts using ordinary Portland cement, pearlite and silica fume. The neutralized depth of the produced hydrated cured product was measured after a predetermined carbonation acceleration test. The test results are shown in Tables 1-4. Comparative Example 6 A hydrated product was obtained in the same manner as in Example 6 except that magnesium hydroxide was not added. The test results are shown in Table 5 along with Example 6.
【００２２】[0022]
【発明の効果】本発明により、水和硬化体に水酸化マグ
ネシウムを含有させることにより、炭酸カルシウムの結
晶成長を制御し、水和硬化体に炭酸化速度を抑制する性
能を付与することができた。INDUSTRIAL APPLICABILITY According to the present invention, by containing magnesium hydroxide in a hydrated cured product, it is possible to control the crystal growth of calcium carbonate and impart the hydrated cured product with the ability to suppress the carbonation rate. It was
【表１】 [Table 1]
【表２】 [Table 2]
【表３】 [Table 3]
【表４】 [Table 4]
【表５】 [Table 5]
【表６】 [Table 6]
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｃ０４Ｂ 103:60 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display area // C04B 103: 60
Claims (2)
り結合させてなる硬化体に含有されるカルシウム化合物
（酸化カルシウム換算）に対して５〜８０重量％の水酸
化マグネシウムが含有されることを特徴とする水和硬化
体。1. A magnesium hydroxide is contained in an amount of 5 to 80% by weight based on the calcium compound (calculated as calcium oxide) contained in a cured product obtained by binding aggregates and fibers with a calcium hydrate compound. Characterized hydrated cured product.
タル、吹き付けモルタル、コンクリート、高強度コンク
リート、軽量コンクリート、気泡コンクリート、軽量気
泡コンクリート、およびそれらを水蒸気養生またはオー
トクレーブ養生したもの、並びに、ケイ酸カルシウム板
（ケイカル板）、ケイ酸カルシウム系断熱材、ケイ酸カ
ルシウム系人造木材である請求項１に記載の水和硬化
体。2. The hydrated cured product is a mortar, a mortar containing fibers, a sprayed mortar, concrete, high-strength concrete, lightweight concrete, aerated concrete, lightweight aerated concrete, and steam-cured or autoclave-cured products thereof, and a silica. The hydrated cured product according to claim 1, which is a calcium silicate plate (calcium plate), a calcium silicate heat insulating material, or a calcium silicate artificial wood.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24191693A JP3025401B2 (en) | 1993-08-24 | 1993-08-24 | Manufacturing method of hydrated cured product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24191693A JP3025401B2 (en) | 1993-08-24 | 1993-08-24 | Manufacturing method of hydrated cured product |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11229248A Division JP2000086312A (en) | 1999-08-13 | 1999-08-13 | Hydration-cured product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0761845A true JPH0761845A (en) | 1995-03-07 |
| JP3025401B2 JP3025401B2 (en) | 2000-03-27 |
Family
ID=17081463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24191693A Expired - Fee Related JP3025401B2 (en) | 1993-08-24 | 1993-08-24 | Manufacturing method of hydrated cured product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3025401B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016108208A (en) * | 2014-12-10 | 2016-06-20 | 花王株式会社 | Hydraulic composition |
| CN114605131A (en) * | 2022-02-16 | 2022-06-10 | 南阳师范学院 | Magnesium oxide acetate adhesive for cold consolidation forming of solid powder |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058659B (en) * | 2014-05-30 | 2016-02-03 | 蚌埠华东石膏有限公司 | A kind of refractory concrete and preparation method thereof |
-
1993
- 1993-08-24 JP JP24191693A patent/JP3025401B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016108208A (en) * | 2014-12-10 | 2016-06-20 | 花王株式会社 | Hydraulic composition |
| CN114605131A (en) * | 2022-02-16 | 2022-06-10 | 南阳师范学院 | Magnesium oxide acetate adhesive for cold consolidation forming of solid powder |
| CN114605131B (en) * | 2022-02-16 | 2023-11-14 | 南阳师范学院 | Magnesium oxide acetate adhesive for cold consolidation molding of solid powder |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3025401B2 (en) | 2000-03-27 |
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