JP2011195430A - Low shrinkage cement composition - Google Patents
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- JP2011195430A JP2011195430A JP2010089008A JP2010089008A JP2011195430A JP 2011195430 A JP2011195430 A JP 2011195430A JP 2010089008 A JP2010089008 A JP 2010089008A JP 2010089008 A JP2010089008 A JP 2010089008A JP 2011195430 A JP2011195430 A JP 2011195430A
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Abstract
【課題】 モルタル、コンクリートの乾燥収縮を低減することは、重要な技術課題であるが、これまで高価な収縮低減剤しかなく、経済的理由により普及が妨げられていた。そのため、安価な収縮低減剤が求められていた。
【解決手段】 セメントに対し、０．５〜４％の常温で液体の植物性油脂を配合することにより、モルタル、コンクリートの乾燥収縮を低減する。低収縮性セメント組成物を安価に製造することが可能となり、低収縮性セメント組成物の普及に大きく貢献することが期待される。PROBLEM TO BE SOLVED: To reduce drying shrinkage of mortar and concrete is an important technical problem, but there has been only an expensive shrinkage reducing agent so far and its spread has been hindered for economic reasons. Therefore, an inexpensive shrinkage reducing agent has been demanded.
SOLUTION: Drying shrinkage of mortar and concrete is reduced by blending vegetable oil and fat that is liquid at room temperature of 0.5 to 4% with respect to cement. It is possible to produce a low shrinkage cement composition at a low cost, and it is expected to greatly contribute to the spread of the low shrinkage cement composition.
Description
本発明は、新規な低収縮性セメント組成物に関する。 The present invention relates to a novel low shrinkage cement composition.
セメントを用いたモルタル、コンクリートは一般的に乾燥収縮が大きく、そのためひび割れが発生するなどの問題がある。そのため、乾燥収縮低減剤が開発され一部使用されている。 Cement-based mortar and concrete generally have large drying shrinkage, which causes problems such as cracking. Therefore, a drying shrinkage reducing agent has been developed and partially used.
例えば、従来から提案されているセメント用収縮低減剤は、アルキレンオキシド付加体で代表されるような水溶性の有機物であり（特許文献１参照）、これを練り水に溶解することにより表面張力を下げ、その結果乾燥収縮を低減するというものである。 For example, a conventionally proposed shrinkage reducing agent for cement is a water-soluble organic substance represented by an alkylene oxide adduct (see Patent Document 1), and the surface tension is reduced by dissolving it in kneaded water. Lowering, and as a result, reducing drying shrinkage.
しかしながら、上記した従来の乾燥収縮低減剤は、高価な有機合成物であり、セメント組成物に添加する場合、コスト的な面において使用が制限されているのが現状である。 However, the above-mentioned conventional drying shrinkage reducing agent is an expensive organic compound, and when it is added to a cement composition, its use is limited in terms of cost.
従って、本発明の目的は、高価であるが故に普及が十分でなかった、従来の乾燥収縮低減剤を使用した低収縮性セメント組成物に代って、安価で、且つ、乾燥収縮低減効果の優れた低収縮性セメント組成物及び乾燥収縮低減剤を提供することにある。 Therefore, the object of the present invention is to replace the low-shrinkage cement composition using a conventional dry shrinkage reducing agent, which has not been widely spread because of its high cost, and is inexpensive and has an effect of reducing dry shrinkage. An object of the present invention is to provide an excellent low shrinkage cement composition and a drying shrinkage reducing agent.
上記目的に対して、本発明者は、特定の油脂をセメント組成物に特定の割合で配合することによって、硬化時の乾燥収縮を著しく防止し、且つ、硬化体においても本来の強度の発現が可能であることを見出し、本発明を完成するに至った。 For the above purpose, the present inventor significantly prevents drying shrinkage at the time of curing by blending specific fats and oils in the cement composition at a specific ratio, and the cured body exhibits the original strength. The inventors have found that this is possible and have completed the present invention.
即ち、本発明は、セメントに対し、常温で液体の植物性油脂を０．５〜４質量％の割合で含有することを特徴とする低収縮性セメント組成物である。 That is, the present invention is a low shrinkage cement composition characterized in that it contains vegetable oils and fats that are liquid at room temperature in a proportion of 0.5 to 4% by mass with respect to the cement.
また、本発明は、常温で液体の植物性油脂を含有することを特徴とするセメント用収縮低減剤をも提供するものである。 Moreover, this invention also provides the shrinkage reducing agent for cement characterized by containing vegetable oil and fat which are liquid at normal temperature.
本発明においては、安価に入手が可能な植物性油脂をセメント用収縮低減剤として使用し、低収縮性セメント組成物を得ることが可能であり、しかも、得られる低収縮性セメント組成物は、従来の高価なセメント用収縮低減剤を使用した場合と同等の性能を発揮することができる。 In the present invention, it is possible to obtain a low shrinkage cement composition by using vegetable oils and fats that can be obtained at low cost as a shrinkage reducing agent for cement. The same performance as when a conventional expensive cement shrinkage reducing agent is used can be exhibited.
従って、低収縮性セメント組成物を安価に製造することが可能となり、低収縮性セメント組成物の普及に大きく貢献することが期待される。 Therefore, it is possible to produce a low shrinkage cement composition at a low cost, and it is expected to greatly contribute to the spread of the low shrinkage cement composition.
尚、常温で液体であり、水に不溶性である点で植物性油脂と性能が一致する流動パラフィンのような鉱油は、乾燥収縮の低減効果が小さく本発明の目的を達成することができない。これに対して、植物性油脂である本発明のセメント用収縮低減剤が、何故、前記効果を発揮するかは明確ではなく、今後の解明が待たれるところである。 Mineral oil such as liquid paraffin, which is liquid at room temperature and insoluble in water, and has the same performance as vegetable oils and fats, has a small effect of reducing drying shrinkage and cannot achieve the object of the present invention. On the other hand, it is not clear why the shrinkage reducing agent for cement of the present invention, which is a vegetable oil, exhibits the above-mentioned effect, and further elucidation is awaited.
以下、本発明を詳しく説明する。 The present invention will be described in detail below.
本発明の低収縮性セメント組成物において、使用される植物性油脂は、常温（２５℃）で液体であるものであれば、特に限定されないが、価格、入手のし易さ、使い易さ等から、菜種油、綿実油、大豆油、ごま油、紅花油、オリーブオイルなどが挙げられる。これらの植物性油脂は、単独又は２種以上を混合して使用することができる。 In the low-shrinkage cement composition of the present invention, the vegetable oil used is not particularly limited as long as it is a liquid at room temperature (25 ° C.), but the price, availability, ease of use, etc. Rapeseed oil, cottonseed oil, soybean oil, sesame oil, safflower oil, olive oil and the like. These vegetable oils and fats can be used alone or in admixture of two or more.
また、上記植物性油脂をてんぷら等の他の用途に使用した後の廃油も有効に利用することができ、材料コストを大幅に下げることも可能である。 Moreover, the waste oil after using the said vegetable oil and fat for other uses, such as a tempura, can also be used effectively, and it can also reduce material cost significantly.
また、本発明の低収縮性セメント組成物において、前記植物性油脂の割合は、セメントの使用量に対して、０．５〜４質量％、好ましくは、１〜３質量％の植物性油脂を乾燥収縮低減剤として配合するのが好ましい。前記植物性油脂の割合が上記０．５質量％より少ないと収縮低減効果が小さすぎ、逆に、４質量％より多過ぎると、セメント組成物の硬化後の強度の低下をもたらすという問題がある。 Moreover, in the low-shrinkage cement composition of the present invention, the proportion of the vegetable oil and fat is 0.5 to 4% by mass, preferably 1 to 3% by mass of the vegetable oil and fat with respect to the amount of cement used. It is preferable to blend as a drying shrinkage reducing agent. If the proportion of the vegetable oil is less than 0.5% by mass, the shrinkage reduction effect is too small. Conversely, if it is more than 4% by mass, there is a problem in that the strength of the cement composition after curing is reduced. .
本発明の低収縮性セメント組成物は、前記植物性油脂を含有するものであれば、他の構成は従来から公知のセメント組成物において知られている構成が特に制限無く採用される。 As long as the low-shrinkage cement composition of the present invention contains the above-mentioned vegetable oil and fat, other configurations that are conventionally known in known cement compositions are employed without any particular limitation.
例えば、本発明の低収縮性セメント組成物に使用されるセメントは、ポルトランドセメントが一般的であるが、その他、早強セメント、高炉セメント、中庸熱セメント等を使用することができる。 For example, the cement used in the low-shrinkage cement composition of the present invention is generally Portland cement, but in addition, early-strength cement, blast furnace cement, intermediate heat cement, and the like can be used.
また、本発明の低収縮性セメント組成物の調製方法は、特に制限されるものではない。例えば、前記組成を乾式で混合して組成物を構成してもよいし、前記植物性油脂の成分を除いた組成を水と混合し、その後、植物性油脂を添加して組成物を構成してもよい。 The method for preparing the low shrinkage cement composition of the present invention is not particularly limited. For example, the composition may be mixed by dry mixing the composition, or the composition excluding the vegetable fats and oils may be mixed with water, and then the vegetable fats and oils may be added to form the composition. May be.
本発明の収縮低減剤は、公知のセメント用混和剤、混和材と併用してセメント組成物を構成することも出来る。混和材の例としては、硬化促進剤、硬化遅延剤、防錆剤などが挙げられるが、収縮量をさらに小さくするために膨張材との併用は、特に推奨される。また、収縮量の大きいセルフレベリング材への応用も期待できる。 The shrinkage reducing agent of the present invention can also be used in combination with known cement admixtures and admixtures to form a cement composition. Examples of admixtures include curing accelerators, curing retarders, rust preventives, etc., but in order to further reduce the amount of shrinkage, the combined use with an expanding material is particularly recommended. Moreover, application to a self-leveling material having a large shrinkage can be expected.
以下、本発明を実施例に基づき説明する。ただし本発明は本実例に限定されるものではない。 Hereinafter, the present invention will be described based on examples. However, the present invention is not limited to this example.
実施例
表１の配合によりモルタル試験を行った。収縮試験はＪＩＳＡ１１２９のコンタクトゲージ法で、圧縮強度は、ＪＩＳ Ｒ５２０１に従って測定した。２０℃で２４時間後に脱型、基長測定後、２０℃、６０％ＲＨで２８日放置し、収縮量、強度を測定した。結果は表１に示すが、十分な収縮低減効果が確認できた。Example A mortar test was conducted according to the formulation shown in Table 1. The shrinkage test was performed according to JIS 1129 contact gauge method, and the compressive strength was measured according to JIS R5201. After 24 hours at 20 ° C., the mold was removed and the base length was measured. The results are shown in Table 1, and a sufficient shrinkage reduction effect was confirmed.
比較例
表１の３の配合で、油種類をサラダ油に変えて、市販のアルキレンオキシド付加体系収縮低減剤、流動パラフィンを使って同様の試験を行った。市販の収縮低減剤は、収縮率２００×１０−４、圧縮強度４３Ｎ／ｍｍ２となり十分な収縮低減効果があったが、流動パラフィンは、収縮率３５０×１０−４、圧縮強度３８Ｎ／ｍｍ２となり、収縮低減効果がないことがわかった。Comparative Example The same test was performed using the commercially available alkylene oxide addition system shrinkage reducing agent and liquid paraffin in the formulation of 3 in Table 1 except that the oil type was changed to salad oil. A commercially available shrinkage reducing agent has a shrinkage rate of 200 × 10 −4 and a compressive strength of 43 N / mm 2 , and has a sufficient shrinkage reducing effect. However, liquid paraffin has a shrinkage rate of 350 × 10 −4 and a compressive strength of 38 N / mm 2. Thus, it was found that there was no shrinkage reduction effect.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
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| JP2010089008A JP2011195430A (en) | 2010-03-18 | 2010-03-18 | Low shrinkage cement composition |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2010089008A JP2011195430A (en) | 2010-03-18 | 2010-03-18 | Low shrinkage cement composition |
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| JP2011195430A true JP2011195430A (en) | 2011-10-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101281024B1 (en) * | 2012-11-05 | 2013-07-09 | (주) 선엔지니어링종합건축사사무소 | Process for preparing concrete having reduction of autogenous shrinkage and high flowability using reformed and purified plant oils |
| CN103708794A (en) * | 2013-12-07 | 2014-04-09 | 马鞍山市金韩防水保温工程有限责任公司 | Waterproof and heat insulation mortar for building outer walls |
| JP2017031038A (en) * | 2015-08-04 | 2017-02-09 | 松男 多田 | Stone material mixed with oil |
| JP2018145043A (en) * | 2017-03-03 | 2018-09-20 | サンノプコ株式会社 | Viscosity modifier for cement composition and cement composition |
| JP2022093479A (en) * | 2016-03-24 | 2022-06-23 | ソニーグループ株式会社 | Information processing equipment, information processing methods, and programs |
-
2010
- 2010-03-18 JP JP2010089008A patent/JP2011195430A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101281024B1 (en) * | 2012-11-05 | 2013-07-09 | (주) 선엔지니어링종합건축사사무소 | Process for preparing concrete having reduction of autogenous shrinkage and high flowability using reformed and purified plant oils |
| CN103708794A (en) * | 2013-12-07 | 2014-04-09 | 马鞍山市金韩防水保温工程有限责任公司 | Waterproof and heat insulation mortar for building outer walls |
| JP2017031038A (en) * | 2015-08-04 | 2017-02-09 | 松男 多田 | Stone material mixed with oil |
| JP2022093479A (en) * | 2016-03-24 | 2022-06-23 | ソニーグループ株式会社 | Information processing equipment, information processing methods, and programs |
| JP7396396B2 (en) | 2016-03-24 | 2023-12-12 | ソニーグループ株式会社 | Information processing device, information processing method, and program |
| JP2018145043A (en) * | 2017-03-03 | 2018-09-20 | サンノプコ株式会社 | Viscosity modifier for cement composition and cement composition |
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