JPH05254902A - Microcapsule for concrete and concrete containing microcapsule - Google Patents
Microcapsule for concrete and concrete containing microcapsuleInfo
- Publication number
- JPH05254902A JPH05254902A JP5259492A JP5259492A JPH05254902A JP H05254902 A JPH05254902 A JP H05254902A JP 5259492 A JP5259492 A JP 5259492A JP 5259492 A JP5259492 A JP 5259492A JP H05254902 A JPH05254902 A JP H05254902A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- microcapsule
- microcapsules
- soluble film
- strength
- 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
- 239000003094 microcapsule Substances 0.000 title claims description 15
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 230000006866 deterioration Effects 0.000 description 10
- 229910052918 calcium silicate Inorganic materials 0.000 description 7
- 239000000378 calcium silicate Substances 0.000 description 7
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000000354 decomposition reaction Methods 0.000 description 4
- 230000003405 preventing effect Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229910017109 AlON Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- JLDKGEDPBONMDR-UHFFFAOYSA-N calcium;dioxido(oxo)silane;hydrate Chemical compound O.[Ca+2].[O-][Si]([O-])=O JLDKGEDPBONMDR-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/32—Carbides; Nitrides; Borides ; Silicides
- C04B14/325—Nitrides
- C04B14/326—Aluminium nitride
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing Of Micro-Capsules (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、コンクリート用マイ
クロカプセル及びかかるマイクロカプセルを含むコンク
リートに関し、とくにコンクリート硬化体の中性化を有
利に防止して長期にわたって十分な強度を確保しようと
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to microcapsules for concrete and concrete containing such microcapsules, and is particularly intended to advantageously prevent neutralization of hardened concrete and ensure sufficient strength for a long period of time. is there.
【０００２】[0002]
【従来の技術】コンクリート硬化体は、空気中に放置さ
れると、クラック又は表面からの炭酸ガスや酸性雨等の
影響により、硬化体中のｐＨがアルカリから中性に変化
していく。このため、コンクリート硬化体の強度の源で
ある珪酸カルシウム水和物（Ｃ−Ｓ−Ｈ）が分解され、
強度劣化を生じる。2. Description of the Related Art When a hardened concrete is left to stand in the air, the pH of the hardened body changes from alkali to neutral due to the effects of carbon dioxide gas and acid rain from the surface. Therefore, calcium silicate hydrate (C-S-H), which is the source of strength of the hardened concrete, is decomposed,
Strength deterioration occurs.
【０００３】従来、上記したようなコンクリート硬化体
の劣化防止策としては、コンクリート硬化体表面に樹脂
をコーティングして、外気の影響を遮断する方策がとら
れていた。しかしながら、樹脂とコンクリート硬化体と
の接合強度は低いために剥離を生じ、やはり硬化体の劣
化は避け得なかった。このように、従来はコンクリート
硬化体の強度の源である珪酸カルシウム水和物の分解を
防止する有効な手段がなく、その開発が望まれていた。Conventionally, as a measure for preventing the deterioration of the hardened concrete as described above, a method of coating the surface of the hardened concrete with a resin to block the influence of the outside air has been taken. However, since the bonding strength between the resin and the hardened concrete was low, peeling occurred, and deterioration of the hardened body was unavoidable. As described above, conventionally, there is no effective means for preventing decomposition of calcium silicate hydrate, which is a source of strength of hardened concrete, and its development has been desired.
【０００４】[0004]
【発明が解決しようとする課題】この発明は、上記の問
題を有利に解決するもので、コンクリート硬化体の強度
の源である珪酸カルシウム水和物の分解を効果的に阻止
して、該硬化体の強度劣化を有利に防止することができ
るコンクリート用マイクロカプセルを、かかるマイクロ
カプセルを含有させたコンクリートと共に提案すること
を目的とする。SUMMARY OF THE INVENTION The present invention advantageously solves the above problems by effectively preventing the decomposition of calcium silicate hydrate, which is the source of the strength of hardened concrete, to prevent the hardening of the concrete. It is an object of the present invention to propose a microcapsule for concrete, which can advantageously prevent deterioration of strength of the body, together with concrete containing such a microcapsule.
【０００５】[0005]
【課題を解決するための手段】さて発明者らは、上記の
問題を解決すべく、鋭意研究を重ねた結果、珪酸カルシ
ウム水和物の分解を防止するためには、窒化アルミニウ
ム（AlＮ）が極めて有効に寄与することの知見を得た。
この発明は、上記の知見に立脚するものである。Means for Solving the Problems The inventors of the present invention have conducted extensive studies to solve the above problems, and as a result, in order to prevent the decomposition of calcium silicate hydrate, aluminum nitride (AlN) was used. We have found that it contributes extremely effectively.
The present invention is based on the above findings.
【０００６】すなわちこの発明は、難溶性膜で被覆され
た窒化アルミニウム粉末からなるコンクリート用マイク
ロカプセルである。この発明において、難溶性の被膜と
しては Al2O3膜がとりわけ有利に適合する。That is, the present invention is a microcapsule for concrete made of aluminum nitride powder coated with a poorly soluble film. In the present invention, an Al 2 O 3 film is particularly advantageously suited as a poorly soluble film.
【０００７】またこの発明は、難溶性膜で被覆された窒
化アルミニウム粉末からなるコンクリート用マイクロカ
プセルを 0.001〜１wt％（以下単に％で示す）の範囲で
含有するコンクリートである。The present invention is also concrete containing concrete microcapsules made of aluminum nitride powder coated with a poorly soluble film in the range of 0.001 to 1 wt% (hereinafter referred to simply as%).
【０００８】[0008]
【作用】この発明に従い、難溶性膜で被覆されたAlＮ粉
末をマイクロカプセルとしてコンクリート硬化体中に添
加することによって、該硬化体の劣化が効果的に防止さ
れる理由は、次のとおりである。さてAlＮは、水と反応
すると水素化アルミニウムとアンモニアを生成するが、
この反応生成物であるアンモニアは、可溶性であり水に
容易に溶解し、溶液をアルカリ性とする。一方、硬化体
中にマイクロカプセルとして添加するAlＮ粉末の表面は
Al2O3等で被われているが、この Al2O3は難溶性である
ので短期間では溶出しない。従って、コンクリート硬化
体の劣化が開始する時期に Al2O3層が溶出し、AlＮが表
面に裸出するように被覆層厚を調整しておけば、所望の
時期に水との反応によってアンモニアが生成し、溶液を
アルカリ性として、コンクリート硬化体の強度の源であ
る珪酸カルシウム水和物が安定して存在し得る環境が維
持されるので、その分解が起こらず、それ故強度劣化を
防止できるのである。The reason why the deterioration of the hardened product is effectively prevented by adding the AlN powder coated with the hardly soluble film as microcapsules to the hardened concrete according to the present invention is as follows. .. AlN produces aluminum hydride and ammonia when it reacts with water.
The reaction product, ammonia, is soluble and readily soluble in water, rendering the solution alkaline. On the other hand, the surface of the AlN powder added as microcapsules in the cured product is
Although covered with Al 2 O 3, etc., this Al 2 O 3 is poorly soluble and will not elute in a short period of time. Therefore, if the coating layer thickness is adjusted so that the Al 2 O 3 layer elutes at the time when the deterioration of the hardened concrete begins and AlN is barely exposed on the surface, ammonia reacts with water at the desired time. Is generated, the solution is made alkaline, and the environment in which the calcium silicate hydrate, which is the source of strength of the hardened concrete, can exist stably is maintained, so that its decomposition does not occur and therefore strength deterioration can be prevented. Of.
【０００９】ここに難溶性膜の材料としては、 Al2O3の
他にAlONなどが適合する。またその被膜厚さは 0.1〜10
μm とくに１〜５μm 程度が好適である。というのはか
かる膜厚範囲に調整することによって、難溶性膜の溶出
時期を的確にコントロールすることができるからであ
る。As the material of the hardly soluble film, AlON or the like is suitable in addition to Al 2 O 3 . The coating thickness is 0.1-10
μm, especially about 1 to 5 μm is suitable. This is because the elution time of the hardly soluble film can be controlled accurately by adjusting the film thickness range.
【００１０】またかかるマイクロカプセルのコンクリー
トに対する添加量は、 0.001〜１％（望ましくは0.01〜
0.1 ％）程度とすることが好ましい。というのは 0.001
％に満たないと強度劣化防止効果に乏しく、一方１％を
超える多量添加は、マイクロカプセルそれ自体は強度に
寄与しない物質であるので、かえって硬化体の強度を低
下させるからである。かくして、珪酸カルシウム水和物
の分解が起こらず、コンクリート硬化体の強度を長期に
わたって維持できるコンクリートが得られのである。The amount of such microcapsules added to concrete is 0.001 to 1% (preferably 0.01 to 1%).
0.1%) is preferable. Because 0.001
%, The strength deterioration preventing effect is poor. On the other hand, addition of a large amount of more than 1% does not contribute to the strength of the microcapsules per se, and rather reduces the strength of the cured product. Thus, it is possible to obtain concrete in which calcium silicate hydrate is not decomposed and the strength of the hardened concrete can be maintained for a long period of time.
【００１１】[0011]
実施例１ 普通ポルトランドセメント、骨材及び水を重量比で１：
２：0.65の割合で配合して均一な原料スラリーを調整し
た。次に、空気中にて 300℃, 10時間の熱処理を施し
て、その表面に厚み：２μmの Al2O3層を形成したAlＮ
粉末（平均粒径：10μm ）を、上記の原料スラリー中に
0.03％添加し、均一に分散させたのち、方形型枠に注入
した。ついで40℃にて１日間養生したのち、脱型し、硬
化体を得た。Example 1 Normal Portland cement, aggregate and water in a weight ratio of 1:
A uniform raw material slurry was prepared by mixing in a ratio of 2: 0.65. Next, 300 ° C. in air, subjected to heat treatment for 10 hours, the thickness on the surface: the formation of the the Al 2 O 3 layer of 2 [mu] m AlN
Powder (average particle size: 10 μm) in the above raw material slurry
After 0.03% was added and dispersed uniformly, the mixture was poured into a rectangular mold. Then, after curing at 40 ° C. for 1 day, the mold was removed to obtain a cured product.
【００１２】比較例１ 普通ポルトランドセメント、骨材及び水を重量比で１：
２：0.65の割合で配合して均一な原料スラリーを調整し
た。ついで、この原料スラリーを方形型枠に注入し、40
℃にて１日間養生したのち、脱型し、硬化体を得た。そ
の後、この硬化体をエポキシ樹脂でコーティングし、60
℃, ２時間の硬化処理を施した。Comparative Example 1 Normal Portland cement, aggregate and water in a weight ratio of 1:
A uniform raw material slurry was prepared by mixing in a ratio of 2: 0.65. Then, pour this raw material slurry into a square mold,
After curing at 0 ° C for 1 day, the mold was removed to obtain a cured product. Then, coat the cured product with epoxy resin and
A curing treatment was performed at ℃ for 2 hours.
【００１３】上記実施例１、比較例１で得られた硬化体
に対し、劣化試験として、炭酸ガス中で養生する炭酸化
試験（室温：25℃以下、湿度：50％、 CO2：５ vol％）
を施し、その後の圧縮強度について調査した。その結
果、実施例１は、３ヶ月強度が 325 kgf/cm2であったの
に対し、比較例１のそれは 280 kgf/cm2にすぎなかっ
た。またフェノールフタレインにより中性化域について
調査したところ、実施例１ではコンクリート断面の中性
化域の厚みは１〜２mm程度であったのに対し、比較例１
のそれは３〜４mmにも達していた。なお比較例１では、
コーティングしたエポキシ樹脂に剥離も見られた。As a deterioration test, a carbonation test (room temperature: 25 ° C. or lower, humidity: 50%, CO 2 : 5 vol) of curing the cured products obtained in Example 1 and Comparative Example 1 was performed. %)
Then, the compressive strength after that was investigated. As a result, in Example 1, the 3-month strength was 325 kgf / cm 2 , whereas in Comparative Example 1, it was only 280 kgf / cm 2 . Further, when the neutralized region was examined with phenolphthalein, the thickness of the neutralized region of the concrete cross section in Example 1 was about 1 to 2 mm, whereas the comparative example 1
That's 3-4 mm. In Comparative Example 1,
Peeling was also seen on the coated epoxy resin.
【００１４】[0014]
【発明の効果】かくしてこの発明によれば、コンクリー
ト硬化体の強度の源である珪酸カルシウム水和物の劣化
を極めて簡便に防止することができ、ひいてはコンクリ
ート寿命の延長を図ることができる。As described above, according to the present invention, the deterioration of calcium silicate hydrate, which is the source of the strength of the hardened concrete, can be prevented very easily, and the life of the concrete can be extended.
Claims (3)
粉末からなるコンクリート用マイクロカプセル。1. A microcapsule for concrete which comprises an aluminum nitride powder coated with a poorly soluble film.
コンクリート用マイクロカプセル。2. The microcapsule for concrete according to claim 1, wherein the poorly soluble film is Al 2 O 3 .
粉末からなるコンクリート用マイクロカプセルを 0.001
〜１wt％の範囲で含有するコンクリート。3. A microcapsule for concrete comprising an aluminum nitride powder coated with a sparingly soluble film is added to 0.001.
Concrete containing in the range of ~ 1 wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5259492A JP3231825B2 (en) | 1992-03-11 | 1992-03-11 | Microcapsules for concrete and concrete containing microcapsules |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5259492A JP3231825B2 (en) | 1992-03-11 | 1992-03-11 | Microcapsules for concrete and concrete containing microcapsules |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05254902A true JPH05254902A (en) | 1993-10-05 |
| JP3231825B2 JP3231825B2 (en) | 2001-11-26 |
Family
ID=12919114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5259492A Expired - Lifetime JP3231825B2 (en) | 1992-03-11 | 1992-03-11 | Microcapsules for concrete and concrete containing microcapsules |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3231825B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101254490B1 (en) * | 2010-11-11 | 2013-04-19 | (주) 캐어콘 | Micro capsule compound and manufacturing method of said the micro capsule compound |
| CN110756213A (en) * | 2019-11-07 | 2020-02-07 | 中国科学院上海高等研究院 | Aluminum nitride-based catalyst, preparation method and application |
| CN120399427A (en) * | 2025-04-21 | 2025-08-01 | 西安理工大学 | Waterborne polyurethane capsule, impact-resistant concrete and preparation method thereof |
-
1992
- 1992-03-11 JP JP5259492A patent/JP3231825B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101254490B1 (en) * | 2010-11-11 | 2013-04-19 | (주) 캐어콘 | Micro capsule compound and manufacturing method of said the micro capsule compound |
| CN110756213A (en) * | 2019-11-07 | 2020-02-07 | 中国科学院上海高等研究院 | Aluminum nitride-based catalyst, preparation method and application |
| CN120399427A (en) * | 2025-04-21 | 2025-08-01 | 西安理工大学 | Waterborne polyurethane capsule, impact-resistant concrete and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3231825B2 (en) | 2001-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4904503A (en) | Rapid setting cementitious fireproofing compositions and method of spray applying same | |
| EP0566413B1 (en) | Improved sprayable portland cement-based fireproofing compositions | |
| US3574816A (en) | Process for treating rice husk | |
| HK1000350B (en) | Improved sprayable portland cement-based fireproofing compositions | |
| JP5209873B2 (en) | Powdery building material composition | |
| US4205994A (en) | Expansive cement and agent therefor | |
| GB2045226A (en) | Single component potassium silicate cement or dry gunning | |
| CN110759699B (en) | Bottom layer plastering gypsum and preparation method thereof | |
| US4298392A (en) | Accelerator for setting of cements | |
| AU4967897A (en) | Cement composition, concrete using the same and method of manufacturing concrete product | |
| JP3231825B2 (en) | Microcapsules for concrete and concrete containing microcapsules | |
| RU2148044C1 (en) | Composition for manufacturing cellular material | |
| JP4617073B2 (en) | Quick hardening material and quick hardening cement composition | |
| CN116535892A (en) | Preparation process of concrete surface coating impervious agent and cement-based waterproof impervious coating | |
| JP3093036B2 (en) | Manufacturing method of lightweight aggregate | |
| JP2003171161A (en) | Heat-resistant and high-strength concrete and its manufacturing method | |
| JPH0761845A (en) | Hydrated and hardened material | |
| CN113943141A (en) | Surface-modified reinforced gypsum powder and preparation method and application thereof | |
| JPS6050738B2 (en) | High sulfate slag cement and its manufacturing method | |
| JPH07126052A (en) | Round aggregate for cement paste adhering concrete and method for producing the same | |
| JP2000086312A (en) | Hydrated hydrate | |
| JP2002097045A (en) | Aggregate for hardened cement and hardened cement | |
| JPS6357474B2 (en) | ||
| JPH07247146A (en) | High fire resistance spray material | |
| JP2001097750A (en) | Aggregate using waste gypsum and method for producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 6 Free format text: PAYMENT UNTIL: 20070914 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080914 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090914 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090914 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 9 Free format text: PAYMENT UNTIL: 20100914 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 9 Free format text: PAYMENT UNTIL: 20100914 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 10 Free format text: PAYMENT UNTIL: 20110914 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120914 Year of fee payment: 11 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Year of fee payment: 11 Free format text: PAYMENT UNTIL: 20120914 |