JP2009227557A - Self-recovering hydration hardened material and low reaction active cement material - Google Patents
Self-recovering hydration hardened material and low reaction active cement material Download PDFInfo
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Abstract
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本発明は、モルタル又はコンクリート構造物の長期耐久性を確保するため、能動的にひび割れを修復する自己治癒性水和硬化物及び低反応活性セメント材料に関する。 The present invention relates to a self-healing hydrated cured product and a low-reactivity active cement material that actively repair cracks in order to ensure long-term durability of a mortar or concrete structure.
モルタル、コンクリート等の水和硬化物は、圧縮に対する耐力は大きい一方で引張に対する耐力は小さいため、水和硬化物に引張応力が作用したり、温度変化や乾燥によって体積変化が生じるとひび割れが生じ易いといった欠点がある。鉄筋コンクリート構造物にひび割れが発生すると、美観を損なうばかりでなく、大気中の炭酸ガスや雨水等がひび割れ面からコンクリート内部に浸透し、埋設された鉄筋を腐食させ、構造的な欠陥の原因ともなり得る。そのため、過度なひび割れの発生に対しては、防水工、止水工などの補修が行われてきた。
しかしながら、このようなひび割れの補修は、コンクリートの材料単価に比べると遥かに高いコストが係り、鉄筋コンクリート構造物の維持管理費を増大させるという問題がある。
Hydrated cured products such as mortar and concrete have high resistance to compression but low tensile strength. Therefore, cracking occurs when tensile stress acts on the hydrated cured product, or volume changes occur due to temperature changes or drying. There is a drawback that it is easy. When cracks occur in a reinforced concrete structure, not only the appearance is impaired, but carbon dioxide in the atmosphere, rainwater, etc. penetrates into the concrete from the cracked surface, corrodes the embedded reinforcing steel, and causes structural defects. obtain. For this reason, repairs such as waterproofing and waterproofing have been carried out for excessive cracking.
However, such crack repair has a problem that it costs much higher than the unit cost of concrete and increases the maintenance cost of the reinforced concrete structure.
このような問題を解決する手段として、特許文献１には、骨材として未水和のセメントクリンカーを含む自己修復性水和硬化物が開示されている。また、特許文献２には、打設後に硬化した時点において、セメントを含む粉体の未反応部分が残存するように構成したコンクリートが開示されており、その具体的な手段としては、水に対するセメント量を増加させること等が開示されている。 As a means for solving such a problem, Patent Document 1 discloses a self-repairing hydrated cured product containing an unhydrated cement clinker as an aggregate. Further, Patent Document 2 discloses a concrete configured such that an unreacted portion of a powder containing cement remains at the time when it is hardened after placing, and concrete means thereof is cement for water. Increasing the amount is disclosed.
しかしながら、上述の水和硬化物にセメントクリンカーを配合する方法では、石膏成分が不足し、急結、瞬結の虞や、得られる水和硬化物の流動性に悪影響を与える虞がある。さらに、配合するセメントクリンカーの粒径が大きすぎると、局所的に発生するひび割れを修復できない可能性があり、粒径が小さすぎると、反応性が高すぎるため、ひび割れ発生の時点では水和がほぼ完了してしまい、セメントクリンカーがひび割れ修復に寄与できない可能性がある。また、水に対するセメント量を増加させる方法では、得られる水和硬化物の自己治癒能力が不十分であった。
本発明は、このような状況下で、優れた自己治癒能力を有する自己治癒性水和硬化物及び低反応活性セメント材料を提供することを目的とする。
However, in the method of blending cement clinker with the above-mentioned hydrated cured product, the gypsum component is insufficient, and there is a risk of rapid or instantaneous setting, or the fluidity of the resulting hydrated cured product may be adversely affected. Furthermore, if the particle size of the cement clinker to be blended is too large, there is a possibility that locally generated cracks cannot be repaired.If the particle size is too small, the reactivity is too high. It is almost complete and the cement clinker may not be able to contribute to crack repair. Moreover, in the method of increasing the amount of cement with respect to water, the self-healing ability of the obtained hydrated cured product was insufficient.
An object of this invention is to provide the self-healing hydrated hardened | cured material and low-reactivity active cement material which have the outstanding self-healing capability in such a condition.
本発明者らは、前記目的を達成するために鋭意研究を重ねた結果、原料セメントに当該原料セメントの水和に必要な理論水量未満の水を含有させて得られる低反応活性セメント材料を含有する自己治癒性水和硬化物によりその目的を達成し得ることを見出し、この知見に基づいて本発明を完成にするに至った。
すなわち、本発明は、
１．セメントと、水と、原料セメントに当該原料セメントの水和に必要な理論水量未満の水を含有させて得られる低反応活性セメント材料とを含有することを特徴とする自己治癒性水和硬化物、
２．低反応活性セメント材料が、原料セメント１００質量部に対して水５〜２５質量部を含有させて得られたものである上記１に記載の自己治癒性水和硬化物、
３．低反応活性セメント材料が、原料セメントに水を含有させた後、３日間以上保持して得られたものである上記１又は２に記載の自己治癒性水和硬化物、
４．水セメント比が、質量比で１５〜５０％である上記１〜３のいずれかに記載の自己治癒性水和硬化物、
５．原料セメントに当該原料セメントの水和に必要な理論水量未満の水を含有させて得られることを特徴とする低反応活性セメント材料、及び
６．水和硬化物添加用である上記５に記載の低反応活性セメント材料、
を提供するものである。
As a result of intensive studies to achieve the above object, the inventors of the present invention contain a low-reactivity active cement material obtained by containing less than the theoretical amount of water necessary for hydration of the raw material cement in the raw material cement. The present inventors have found that the object can be achieved by a self-healing hydrated cured product, and based on this finding, the present invention has been completed.
That is, the present invention
1. A self-healing hydrated and cured product comprising cement, water, and a low-reactivity active cement material obtained by causing the raw material cement to contain less than the theoretical water amount necessary for hydration of the raw material cement. ,
2. The self-healing hydrated cured product according to 1 above, wherein the low-reactivity active cement material is obtained by containing 5 to 25 parts by mass of water with respect to 100 parts by mass of the raw material cement,
3. The self-healing hydrated cured product according to 1 or 2 above, wherein the low-reactivity active cement material is obtained by adding water to the raw material cement and holding it for 3 days or more,
4). The self-healing hydrated cured product according to any one of 1 to 3 above, wherein the water cement ratio is 15 to 50% by mass ratio,
5. 5. A low-reactivity active cement material obtained by containing raw material cement containing less than the theoretical amount of water necessary for hydration of the raw material cement, and The low-reactivity active cement material according to 5 above, which is for hydrated cured product addition,
Is to provide.
本発明によれば、優れた自己治癒能力を有する自己治癒性水和硬化物及び水和硬化物に自己治癒能力を付与する低反応活性セメント材料を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the low reaction activity cement material which provides the self-healing capability to the self-healing hydrated hardened | cured material which has the outstanding self-healing capability, and a hydrated hardened | cured material can be provided.
本発明の自己治癒性水和硬化物は、セメントと、水と、原料セメントに当該原料セメントの水和に必要な理論水量未満の水を含有させて得られる低反応活性セメント材料とを含有する。
本発明はまた、上記原料セメントに当該原料セメントの水和に必要な理論水量未満の水を含有させて得られる低反応活性セメント材料をも提供する。本発明の低反応活性セメント材料は、水和硬化物添加用として用いることで、得られる水和硬化物に自己治癒能力を付与することができる。
The self-healing hydrated and cured product of the present invention contains cement, water, and a low-reactivity active cement material obtained by causing the raw cement to contain less than the theoretical amount of water necessary for hydration of the raw cement. .
The present invention also provides a low-reactivity active cement material obtained by incorporating the raw material cement with less than the theoretical amount of water necessary for hydration of the raw material cement. By using the low-reactivity active cement material of the present invention for adding a hydrated cured product, self-healing ability can be imparted to the resulting hydrated cured product.
本発明で用いられるセメントとしては、例えば、普通、中庸熱、低熱、早強、超早強、耐硫酸塩など各種ポルトランドセメント、高炉セメントやフライアッシュセメントおよびシリカセメントなどの混合セメントなどから選ばれる少なくとも一種を挙げることができ、具体的には、ＪＩＳ Ｒ ５２１０、ＪＩＳ Ｒ ５２１１、ＪＩＳ Ｒ ５２１２、ＪＩＳ Ｒ ５２１３等で規定されたポルトランドセメント、高炉セメント、シリカセメント、フライアッシュセメント等が挙げられる。
また、本発明の低反応活性セメント材料の原料として用いられる原料セメントとしては、上記セメントと同様のものが用いられる。特に、ＪＩＳ Ｒ ５２１０に規定された低熱ポルトランドセメントが最も好ましい。
本発明の自己治癒性水和硬化物に用いられる水は特に限定されず、水道水でよい。
また、本発明の低反応活性セメント材料の原料として用いられる水についても特に限定されず、水道水でよい。
The cement used in the present invention is selected from, for example, various portland cements such as normal, moderately hot, low heat, early strength, super early strength, sulfate resistance, mixed cements such as blast furnace cement, fly ash cement and silica cement. At least one type can be mentioned, and specific examples include Portland cement, blast furnace cement, silica cement, fly ash cement and the like defined by JIS R 5210, JIS R 5211, JIS R 5212, JIS R 5213, and the like.
Moreover, as the raw material cement used as the raw material of the low reaction activity cement material of the present invention, the same cement as the above cement is used. In particular, the low heat Portland cement specified in JIS R 5210 is most preferable.
The water used for the self-healing hydrated cured product of the present invention is not particularly limited, and may be tap water.
Moreover, it does not specifically limit about the water used as a raw material of the low reaction activity cement material of this invention, Tap water may be sufficient.
本発明の自己治癒性水和硬化物には、所望によりさらに細骨材を含有させることもできる。細骨材としては、例えば、通常のモルタルやコンクリートに使用されている山砂、陸砂、海砂、川砂、砕砂、高炉スラグ細骨材、フェロニッケルスラグ細骨材、銅スラグ細骨材や電気炉酸化スラグ等が挙げられる。上記細骨材は、ＪＩＳ Ａ １１０３「骨材の微粒分量試験方法」の方法により求められる微粒分量が５質量％以下であるものが好ましく、さらに好ましくは、３質量％以下である。
また、本発明の自己治癒性水和硬化物には、所望によりさらに粗骨材を含有させることもできる。粗骨材としては、例えば、川砂利、山砂利、陸砂利、海砂利、砕石、高炉スラグ粗骨材、電気炉酸化スラグ等が挙げられる。
使用する細骨材や粗骨材は、ともに所要強度を満足できる品質を持ったものを選定する。
If desired, the self-healing hydrated cured product of the present invention can further contain fine aggregate. Fine aggregates include, for example, mountain sand, land sand, sea sand, river sand, crushed sand, blast furnace slag fine aggregate, ferronickel slag fine aggregate, copper slag fine aggregate used in ordinary mortar and concrete, An electric furnace oxidation slag, etc. are mentioned. The fine aggregate preferably has a fine particle amount of 5% by mass or less, more preferably 3% by mass or less, determined by the method of JIS A 1103 “Aggregate Fine Particle Amount Test Method”.
In addition, the self-healing hydrated cured product of the present invention may further contain a coarse aggregate as desired. Examples of the coarse aggregate include river gravel, mountain gravel, land gravel, sea gravel, crushed stone, blast furnace slag coarse aggregate, electric furnace oxidation slag, and the like.
Both fine and coarse aggregates to be used are selected to have the quality that satisfies the required strength.
本発明の低反応活性セメント材料は、原料セメントに当該原料セメントの水和に必要な理論水量未満の水を含有させて得られるものであり、この低反応活性セメント材料と、予め水を配合していないセメントとでは、反応活性が異なる。すなわち、セメントと、水と、本発明の低反応活性セメント材料とを含有する本発明の自己治癒性水和硬化物を調製した場合には、セメントが優先的に反応し、セメントの反応によって自己治癒性水和硬化物中の水のほとんどが消費される。すると、低反応活性セメント材料の反応に十分な水は欠乏し、この材料のほとんどが未反応核として残存する。未反応核として存在した低反応活性セメント材料は、一旦、自己治癒性水和硬化物の硬化体にひび割れが発生すると、外部から供給される水と徐々に反応していく。この低反応活性セメント材料と水との反応によって析出される水和物がひび割れを埋めることで、ひび割れの自己修復が実現される。
ここで、原料セメントの水和に必要な理論水量とは、原料セメント全てが水和した場合の化学的結合水の量と、原料セメント粒子と水とが反応する際に水和物に内包されて物理的に固定化される水量とを合計したものをいう。
The low-reactivity cement material of the present invention is obtained by adding less than the theoretical amount of water necessary for hydration of the raw cement to the raw cement, and this low-reactivity cement material is mixed with water in advance. The reaction activity is different from that of cement. That is, when the self-healing hydrated cured product of the present invention containing cement, water, and the low-reactivity active cement material of the present invention is prepared, the cement reacts preferentially and is self-reacted by the cement reaction. Most of the water in the cured hydrated cured product is consumed. Then, there is a lack of water sufficient for the reaction of the low-reactivity active cement material, and most of this material remains as unreacted nuclei. The low-reactivity active cement material that has existed as unreacted nuclei gradually reacts with water supplied from the outside once cracks occur in the cured body of the self-healing hydrated cured product. The hydrate precipitated by the reaction between the low-reactivity cement material and water fills the cracks, thereby realizing self-repair of cracks.
Here, the theoretical amount of water necessary for hydration of the raw cement is the amount of chemically bonded water when all the raw cement is hydrated, and is included in the hydrate when the raw cement particles react with water. The total amount of water that is physically immobilized.
本発明の低反応活性セメント材料としては、原料セメント１００質量部に対して水５〜２５質量部を含有させて得られるものが好ましく、水５〜１０質量部を含有させて得られるものがより好ましく、水５〜７質量部を含有させて得られるものがさらに好ましい。原料セメントに含有させる水の量が５質量部以上であると、原料セメントの反応活性が十分に低下し、２５質量部以下であると、得られる低反応活性セメント材料に未反応核が残るため、いずれにしても本発明の効果が顕著に発現される。
また、低反応活性セメント材料としては、原料セメントに水を含有させた後、３日間以上保持して得られるものが好ましく、７〜２８日間保持して得られるものがより好ましく、７〜１４日間保持して得られるものがさらに好ましい。原料セメントに水を配合してからの保持期間が３日間以上であると、原料セメントの反応活性が十分に低下するため、本願発明の効果がより顕著に発現する。
The low reaction activity cement material of the present invention is preferably obtained by containing 5 to 25 parts by mass of water with respect to 100 parts by mass of the raw material cement, and more preferably obtained by containing 5 to 10 parts by mass of water. What is obtained by containing 5-7 mass parts of water is more preferable. If the amount of water contained in the raw material cement is 5 parts by mass or more, the reaction activity of the raw material cement is sufficiently reduced, and if it is 25 parts by mass or less, unreacted nuclei remain in the resulting low-reactivity active cement material. In any case, the effects of the present invention are remarkably exhibited.
The low-reactivity cement material is preferably one obtained by adding water to the raw material cement and holding it for 3 days or more, more preferably one obtained by holding for 7 to 28 days, and 7 to 14 days. What is obtained by holding is more preferable. When the retention period after adding water to the raw material cement is 3 days or more, the reaction activity of the raw material cement is sufficiently lowered, and thus the effect of the present invention is more remarkably exhibited.
原料セメントに水を含有させる方法は、原料セメントと水とがある程度均一に混合される方法であればよく、例えば、予定量の原料セメントに対して、計量した水をミキサで混合して含有させる方法が挙げられる。
このようにして得られる本発明の低反応活性セメント材料は、原料セメントと水との接触により原料セメント粒子が凝集・結合した２次粒子状となる。従って、原料セメントの平均粒径が一般的に１０μｍ程度であるのに対し、本発明の低反応活性セメント材料の平均粒径は好ましくは２０〜７０μｍであり、より好ましくは４０〜５０μｍである。尚、上記平均粒径とは、レーザー回折・散乱法（マイクロトラック法）によって測定した粒度分布の数平均粒径である。
そして、本発明の低反応活性セメント材料をモルタルやコンクリート等の自己治癒性水和硬化物の材料として配合する場合には、モルタルやコンクリートの配合において用いられる細骨材の一部または全部と置換して用いるのがよい。
The raw material cement may contain water as long as the raw material cement and water are mixed uniformly to some extent. For example, a predetermined amount of raw material cement is mixed with measured water using a mixer. A method is mentioned.
The low-reactivity active cement material of the present invention thus obtained is in the form of secondary particles in which the raw material cement particles are aggregated and bonded by contact between the raw material cement and water. Therefore, the average particle size of the raw material cement is generally about 10 μm, whereas the average particle size of the low reaction activity cement material of the present invention is preferably 20 to 70 μm, more preferably 40 to 50 μm. The average particle size is the number average particle size of particle size distribution measured by a laser diffraction / scattering method (microtrack method).
When the low-reactivity active cement material of the present invention is blended as a material for a self-healing hydrated cured material such as mortar or concrete, it is replaced with a part or all of the fine aggregate used in the blending of mortar or concrete. It is good to use it.
本発明の自己治癒性水和硬化物においては、上述の低反応活性セメント材料と細骨材との比率が、質量比で１０：９０〜２０：８０であると好ましく、１０：９０〜１５：８５であるとより好ましい。低反応活性セメント材料の比率が上記範囲より小さいと、ひび割れ部分の充填が不十分となり、十分な自己治癒能力が発現されず、また、低反応活性セメント材料の比率が上記範囲より大きいと、得られる自己治癒性水和硬化物の流動性が大幅に低下するので実用上好ましくない。 In the self-healing hydrated cured product of the present invention, the mass ratio of the low-reactivity cement material and the fine aggregate is preferably 10:90 to 20:80, and 10:90 to 15: More preferably, it is 85. If the ratio of the low-reactivity active cement material is smaller than the above range, the filling of the cracked portion becomes insufficient, and sufficient self-healing ability is not expressed. Since the fluidity of the resulting self-healing hydrated cured product is greatly lowered, it is not preferred in practice.
また、本発明の自己治癒性水和硬化物における、水セメント比は、質量比で１５〜５０％であると好ましく、１５〜４０％であるとより好ましい。尚、本発明の自己治癒性水和硬化物が含有する低反応活性セメント材料は、上記水セメント比におけるセメント分には算入されない。 Moreover, the water cement ratio in the self-healing hydrated cured product of the present invention is preferably 15 to 50% by mass ratio, and more preferably 15 to 40%. The low-reactivity active cement material contained in the self-healing hydrated cured product of the present invention is not included in the cement content in the water cement ratio.
本発明の自己治癒性水和硬化物には、所望によりさらにシリカフュームを含有させることができる。シリカフュームとは、金属シリコンやフェロシリコンの製造時に副生される非晶質二酸化珪素を主成分とする粒径約０．１〜０．３μｍの球状超微粒子材料であり、コンクリートに混和すると、その高いポゾラン活性やマイクロフィラー効果により硬化体が緻密化され、強度が増進する。 If desired, the self-healing hydrated cured product of the present invention can further contain silica fume. Silica fume is a spherical ultrafine particle material with a particle size of about 0.1 to 0.3 μm mainly composed of amorphous silicon dioxide produced as a by-product during the production of metallic silicon and ferrosilicon. The cured body is densified by high pozzolanic activity and microfiller effect, and the strength is enhanced.
さらに、本発明の自己治癒性水和硬化物には、所望により減水剤を含有させることができる。この減水剤としては、高性能減水剤や、ポリカルボン酸塩系減水剤である高性能ＡＥ減水剤が挙げられる。高性能減水剤とは、ポリアルキルアリルスルホン酸塩系やメラミンホルマリン樹脂スルホン酸塩系のいずれかを主成分とするものである。 Furthermore, the self-healing hydrated cured product of the present invention can contain a water reducing agent as desired. Examples of the water reducing agent include a high performance water reducing agent and a high performance AE water reducing agent which is a polycarboxylate-based water reducing agent. The high-performance water reducing agent is mainly composed of either a polyalkylallyl sulfonate system or a melamine formalin resin sulfonate system.
ポリアルキルアリルスルホン酸塩系高性能減水剤としては、メチルナフタレンスルホン酸ホルマリン縮合物、ナフタレンスルホン酸ホルマリン縮合物、及びアントラセンスルホン酸ホルマリン縮合物等が挙げられ、市販品としては電気化学工業（株）社製商品名「ＦＴ−５００」とそのシリーズ、花王（株）社製商品名「マイティ−１００（粉末）」や「マイティ−１５０」とそのシリーズ、第一工業製薬（株）社製商品名「セルフロー１１０Ｐ（粉末）」、竹本油脂（株）社製商品名「ポールファイン５１０Ｎ」などが挙げられる。メラミンホルマリン樹脂スルホン酸塩系高性能減水剤には、グレースケミカルズ社製商品名「ＦＴ−３Ｓ」、昭和電工（株）社製商品名「モルマスターＦ−１０（粉末）」や「モルマスターＦ−２０（粉末）」が挙げられる。
ポリカルボン酸塩系高性能ＡＥ減水剤としては、（株）エヌエムビー社製商品名「レオビルドＳＰ８」シリーズ、（株）フローリック社製商品名「フローリックＳＦ５００」シリーズ、竹本油脂（株）社製商品名「チュポールＨＰ８，１１」シリーズ、グレースケミカルズ（株）社製商品名「ダーレックススーパー１００，２００，３００，１０００」シリーズ、及び花王（株）社製「マイティ２１ＷＨ，３０００Ｓ」などが挙げられ、その他の市販品も使用される。
高性能減水剤や高性能ＡＥ減水剤の使用量は、前記セメント、水、細骨材及び低反応活性セメント材料の合計１００質量部に対し、通常１．０〜３．０質量部程度である。
Examples of the polyalkylallylsulfonate-based high-performance water reducing agent include methyl naphthalene sulfonic acid formalin condensate, naphthalene sulfonic acid formalin condensate, and anthracene sulfonic acid formalin condensate. ) Product name "FT-500" and its series, product name "Mighty-100 (powder)" and "Mighty-150" and its series made by Kao Corporation, products made by Daiichi Kogyo Seiyaku Co., Ltd. Name “Cellflow 110P (powder)”, Takemoto Yushi Co., Ltd. trade name “Pole Fine 510N” and the like. Melamine formalin resin sulfonate-based high-performance water reducing agent includes Grace Chemicals' product name “FT-3S”, Showa Denko Co., Ltd. product name “Molmaster F-10 (powder)” and “Molmaster F”. -20 (powder) ".
The polycarboxylate-based high-performance AE water reducing agent includes a product name “Leo Build SP8” series manufactured by NM Co., Ltd., a product name “Floric SF500” series manufactured by Floric Co., Ltd., and Takemoto Yushi Co., Ltd. Product name “Chupor HP8,11” series, product name “Darlex Super 100, 200, 300, 1000” series manufactured by Grace Chemicals Co., Ltd., “Mighty 21WH, 3000S” manufactured by Kao Corporation, etc. Other commercial products are also used.
The amount of the high-performance water-reducing agent and high-performance AE water-reducing agent used is usually about 1.0 to 3.0 parts by mass with respect to a total of 100 parts by mass of the cement, water, fine aggregate and low-reactivity active cement material. .
参考例
早強ポルトランドセメント１００質量部及びＪＩＳ Ｒ ５２０１ 附属書３に規定された標準砂２００質量部を、二軸強制練りミキサに投入し、３０秒間攪拌したのち、さらに水５０質量部を投入して３分間練り混ぜ、モルタルを調製した。モルタルの組成を第２表に示す。
モルタル調製後、直ちにモルタルフローを測定した。モルタルフローはＪＩＳ Ｒ ５２０１「セメントの物理試験方法」に準拠し、フローコーン引き上げ後に落下運動を与えない０打フローで比較検討した。測定したモルタルフローを第２表に示す。
次に、このようにして得られたモルタルから、１００ｍｍ×１００ｍｍ×１２０ｍｍの供試体を作製した。供試体作製から７日後に、割裂引張荷重を与えて幅０．１〜０．２ｍｍのひび割れを導入した。
Reference Example 100 parts by weight of early strength Portland cement and 200 parts by weight of standard sand specified in JIS R 5201 Annex 3 were added to a biaxial forced kneading mixer, stirred for 30 seconds, and then 50 parts by weight of water was added. And kneaded for 3 minutes to prepare a mortar. The composition of the mortar is shown in Table 2.
Immediately after mortar preparation, mortar flow was measured. The mortar flow was in accordance with JIS R 5201 “Cement physical test method”, and a comparative study was conducted with a zero stroke flow that did not give a drop motion after pulling up the flow cone. The measured mortar flow is shown in Table 2.
Next, a specimen of 100 mm × 100 mm × 120 mm was produced from the mortar thus obtained. Seven days after the specimen preparation, a split tensile load was applied to introduce cracks having a width of 0.1 to 0.2 mm.
上述のようにしてひび割れを導入した供試体に対して、下記の透水試験を行った。
（透水試験）
ひび割れ導入から７日後に、供試体上部のひび割れ部に、コンプレッサーによって０．０１Ｍｐａの透水圧をかけ、単位時間あたりの供試体下部への透水量を測定した。その後、ひび割れ導入から２８、５６、９１、１８２日後にも、同様にして透水試験を行った。ひび割れ導入から７〜１８２日後に行った透水試験について、（各回の透水量）／（ひび割れ導入から７日後に測定した透水量）で算出される透水比として第３表に示す。
The following water permeability tests were performed on the specimens with cracks introduced as described above.
(Water permeability test)
Seven days after the introduction of the crack, a water permeation pressure of 0.01 Mpa was applied to the cracked portion at the top of the specimen by a compressor, and the amount of permeation to the bottom of the specimen per unit time was measured. Thereafter, the water permeability test was conducted in the same manner 28, 56, 91, and 182 days after the crack was introduced. About the water permeability test performed 7 to 182 days after the crack introduction, it is shown in Table 3 as the water permeability ratio calculated by (water permeability at each time) / (water permeability measured 7 days after the crack introduction).
実施例１（低反応活性セメント材料の調製）
普通ポルトランドセメント（セメントＮ）１００質量部に対して、水５質量部を添加してミキサで混合し、気温２０℃、湿度６０％下で７日間静置し、低反応活性セメント材料を得た。
Example 1 (Preparation of low reaction activity cement material)
5 parts by weight of water was added to 100 parts by weight of ordinary Portland cement (cement N), mixed with a mixer, and allowed to stand for 7 days under an air temperature of 20 ° C. and a humidity of 60% to obtain a low-reactivity active cement material. .
実施例２（自己治癒性水和硬化物の調製）
実施例１で得られた低反応活性セメント材料２０〜４０質量部、早強ポルトランドセメント１００質量部及び細骨材としてＪＩＳ Ｒ ５２０１ 附属書３に規定された標準砂１６０〜１８０質量部を、二軸強制練りミキサに投入し、３０秒間攪拌したのち、さらに水５０質量部を投入して３分間練り混ぜ、モルタルを調製した。セメントの種類、水投入量及び静置期間を第１表に、モルタルの組成を第２表に示す。また、調製したモルタルのモルタルフローを参考例と同様にして測定した。モルタルフローを第２表に示す。
次に、このようにして得られたモルタルから、１００ｍｍ×１００ｍｍ×１２０ｍｍの供試体を作製した。供試体作製から７日後に、割裂引張荷重を与えて幅０．１〜０．２ｍｍのひび割れを導入し、参考例と同様にして透水試験を行った。透水比を第３表に示す。
Example 2 (Preparation of self-healing hydrated cured product)
20 to 40 parts by mass of the low-reactivity active cement material obtained in Example 1, 100 parts by mass of early strength Portland cement, and 160 to 180 parts by mass of standard sand defined in JIS R 5201 Annex 3 as two fine aggregates. The mixture was put into a shaft forced kneading mixer and stirred for 30 seconds, and then 50 parts by mass of water was added and kneaded for 3 minutes to prepare a mortar. Table 1 shows the type of cement, the amount of water input, and the standing period, and Table 2 shows the composition of the mortar. Further, the mortar flow of the prepared mortar was measured in the same manner as in the reference example. The mortar flow is shown in Table 2.
Next, a specimen of 100 mm × 100 mm × 120 mm was produced from the mortar thus obtained. Seven days after the specimen preparation, a split tensile load was applied to introduce cracks having a width of 0.1 to 0.2 mm, and a water permeability test was conducted in the same manner as in the reference example. The water permeability ratio is shown in Table 3.
実施例３〜９（自己治癒性水和硬化物の調製）
第１表に示すセメントの種類、水投入量及び静置期間で、実施例１と同様にして低反応活性セメント材料を得た。第２表に示す組成で、実施例２と同様にしてモルタルを調製した後、供試体を作製し、透水試験を行った。結果を第３表に示す。
Examples 3 to 9 (Preparation of self-healing hydrated cured product)
A low-reactivity active cement material was obtained in the same manner as in Example 1 with the cement type, water input amount, and stationary period shown in Table 1. After preparing mortar with the composition shown in Table 2 in the same manner as in Example 2, a specimen was prepared and a water permeability test was performed. The results are shown in Table 3.
第３表に示すように、参考例においては、通水による供試体中のひび割れの目詰まりに起因すると考えられる透水量の減少が確認できるが、本発明の低反応活性セメント材料を用いたモルタルでは、透水量の減少が著しく、自己治癒能力の発現が確認できる。 As shown in Table 3, in the reference example, it is possible to confirm a decrease in the amount of water permeation considered to be due to clogging of cracks in the specimen due to water flow, but the mortar using the low reaction activity cement material of the present invention In this case, the water permeability is remarkably reduced, and the expression of self-healing ability can be confirmed.
本発明の低反応活性セメント材料は、モルタルやコンクリートに自己治癒能力を付与する性質を有し、構造物の建築等の様々な用途に用いられる。 The low-reactivity active cement material of the present invention has a property of imparting self-healing ability to mortar and concrete, and is used for various applications such as construction of structures.
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| JP2011063488A (en) * | 2009-09-18 | 2011-03-31 | Sumitomo Osaka Cement Co Ltd | Self-repair concrete admixture, method for producing the same, and self-repair concrete material using the admixture |
| JP2015110325A (en) * | 2013-11-06 | 2015-06-18 | 国立大学法人 東京大学 | Hydraulic composition production method and hydraulic composition |
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| JPH069258A (en) * | 1991-03-07 | 1994-01-18 | Nippon Cement Co Ltd | Superhigh-fluidity concrete |
| JP2003267765A (en) * | 2002-03-13 | 2003-09-25 | East Japan Railway Co | Concrete |
| JP2005081824A (en) * | 2003-09-11 | 2005-03-31 | Sumitomo Osaka Cement Co Ltd | Partially hydrated shaped body of hydraulic composition, its manufacturing process, its usage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH069258A (en) * | 1991-03-07 | 1994-01-18 | Nippon Cement Co Ltd | Superhigh-fluidity concrete |
| JP2003267765A (en) * | 2002-03-13 | 2003-09-25 | East Japan Railway Co | Concrete |
| JP2005081824A (en) * | 2003-09-11 | 2005-03-31 | Sumitomo Osaka Cement Co Ltd | Partially hydrated shaped body of hydraulic composition, its manufacturing process, its usage |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011063488A (en) * | 2009-09-18 | 2011-03-31 | Sumitomo Osaka Cement Co Ltd | Self-repair concrete admixture, method for producing the same, and self-repair concrete material using the admixture |
| JP2015110325A (en) * | 2013-11-06 | 2015-06-18 | 国立大学法人 東京大学 | Hydraulic composition production method and hydraulic composition |
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