JP2012140272A - Admixture for crack prevention and cement composition - Google Patents
Admixture for crack prevention and cement composition Download PDFInfo
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本発明は、セメント組成物の乾燥時のひび割れを防止するための混和材および乾燥時のひび割れ抵抗性が高く、美観にも優れたセメント組成物に関する。 The present invention relates to an admixture for preventing cracking during drying of a cement composition, a cement composition having high resistance to cracking during drying, and excellent in aesthetics.
セメントペースト、モルタル、コンクリートなどのセメントを硬化結合相とする組成物は、水和反応後の乾燥で、組成物の毛細管状空隙に存在する水が蒸発する際にメニスカスが形成され、毛細管張力が生じて組成物硬化体に収縮歪みが生じる。この歪みがセメント組成物硬化体の乾燥ひび割れ発現に繋がる。乾燥ひび割れは一般に硬化体表面に多数の比較的微細な亀裂として現れるため、物理的性状への影響はもとより、表面美観に及ぼす影響も大きい。セメント組成物硬化体の乾燥ひび割れを防ぐには、界面活性物質で毛細管状空隙内の水の表面張力を低下させるのが効果的であり、各種の有機系界面活性物質を有効成分とする収縮低減剤が知られている。（例えば、特許文献１〜５参照。） A composition having cement as a hardened binder phase such as cement paste, mortar, concrete, etc., forms a meniscus when the water present in the capillary space of the composition evaporates by drying after the hydration reaction, and the capillary tension is increased. As a result, shrinkage distortion occurs in the cured composition. This distortion leads to the appearance of dry cracks in the cured cement composition. Since dry cracks generally appear as a large number of relatively fine cracks on the surface of the cured body, the effect on the surface aesthetics as well as on the physical properties is great. In order to prevent dry cracking of the hardened cement composition, it is effective to lower the surface tension of water in the capillary void with a surfactant, and to reduce shrinkage using various organic surfactants as active ingredients Agents are known. (For example, see Patent Documents 1 to 5.)
一方で、界面活性成分を使用すると、セメント等から水中に溶出し、細孔内での水の表面張力によって滞留していたカルシウムイオンが、水の表面張力の低下に伴い、蒸発水と共にセメント組成物表面に搬送・浮上して蓄積化し、白華が現れ易くなる。白華の発生による硬化体表面美観の低下を嫌う場合、一般にはカルシウムイオンと反応して不溶性化合物を生成し易い物質を有効成分とする白華防止剤を使用することが行われている。（例えば、特許文献６参照。）しかし、白華防止剤を収縮低減剤と併用しても、乾燥ひび割れの抑制には相応の有効性が見られるものの、白華防止剤有効成分と反応して生成された不溶性のカルシウム化合物が組成物内部に安定して留まらずに、増大する蒸発水と共に表面に搬送されることが多々見られ、これが硬化体表面の色ムラや変色となったり、生成物によっては白華原因となることもあり、とりわけ外装建材用などのセメント系硬化体で重視される表面美感の確保は容易でなかった。 On the other hand, when a surface active component is used, calcium ions eluted from the cement etc. into the water and retained due to the surface tension of the water in the pores, together with the evaporating water, the cement composition as the surface tension of the water decreases. Conveys and floats on the surface of the object, accumulates it, and white flower tends to appear. In the case where the reduction in the appearance of the cured product surface due to the generation of white flower is disliked, generally, an anti-white flower agent containing a substance that reacts with calcium ions and easily forms an insoluble compound as an active ingredient is used. (For example, refer to Patent Document 6.) However, even if a whitening inhibitor is used in combination with a shrinkage reducing agent, although it has a corresponding effectiveness in suppressing dry cracking, it reacts with an active ingredient of whitening agent. The generated insoluble calcium compound does not stay stably inside the composition, but is often transported to the surface together with the increasing evaporated water, which may cause uneven color or discoloration on the surface of the cured product, May cause white blossoms, and in particular, it is not easy to ensure the surface aesthetics that are important in cemented hardened bodies for exterior building materials.
本発明は、前記問題の解決、即ち、セメントペーストやモルタル等のセメント組成物において乾燥ひび割れの発生を防止するに当たり界面活性成分を有効成分とする収縮低減剤を用いると白華が生じ易くなる。このような乾燥収縮低減剤に白華防止剤を併用しても白華や色ムラの発生を防止することが困難であったことから、表面美観向上効果のある乾燥ひび割れ防止用混和材の提供及び該混和材を用いた美観性に優れる高いひび割れ抵抗性のセメント組成物を提供することを課題とする。 In the present invention, in order to solve the above problem, that is, to prevent the occurrence of dry cracking in a cement composition such as cement paste or mortar, whitening is likely to occur when a shrinkage reducing agent having a surface active component as an active ingredient is used. Providing an admixture for preventing dry cracking that has an effect of improving surface aesthetics because it was difficult to prevent the occurrence of white flower and uneven color even when such a dry shrinkage reducing agent was used in combination. Another object of the present invention is to provide a high crack-resistant cement composition having excellent aesthetics using the admixture.
本発明者は、白華の発生程度は乾燥化によるモルタル等のセメント組成物からの水分の表面への移動量が多いものほど白華発生も概して多く、水分の表面への移動量は収縮低減剤の含有量に比例して多くなる傾向があるという知見から、水分中に溶出したカルシウムイオンをセメント組成物の内部で捕捉・固定化できる材料を見いだすべく検討を重ねた結果、モルタルやコンクリート用の有機系収縮低減剤と高多孔質珪藻土の併用によって前記課題が解決できたことから本発明を完成させた。 The present inventor found that the amount of white flower generated is generally larger as the amount of moisture transferred from the cement composition such as mortar due to drying to the surface increases, and the amount of water transferred to the surface decreases shrinkage. As a result of repeated investigations to find materials that can capture and fix calcium ions eluted in moisture in the cement composition based on the knowledge that they tend to increase in proportion to the content of the agent. The present invention was completed because the above problems could be solved by the combined use of the organic shrinkage reducing agent and highly porous diatomaceous earth.
即ち、本発明は、次の［１］〜［３］で表される乾燥ひび割れ防止剤、および［４］で表されるセメント組成物である。
［１］有機系収縮低減剤及び珪藻土を含有してなるひび割れ防止用混和材。
［２］さらに、石灰石粉を含有してなる前記［１］のひび割れ防止用混和材。
［３］さらに、エトリンガイト生成物質及び／又は生石灰を有効成分とする膨張材を含有してなる前記［１］又は［２］のひび割れ防止用混和材。
［４］前記［１］〜［３］の何れかのひび割れ防止用混和材とセメントを含有してなる前記［１］〜［３］の何れかのセメント組成物。
That is, this invention is the dry crack prevention agent represented by following [1]-[3], and the cement composition represented by [4].
[1] A crack preventing admixture comprising an organic shrinkage reducing agent and diatomaceous earth.
[2] The crack-preventing admixture according to [1], further comprising limestone powder.
[3] The crack-preventing admixture according to [1] or [2], further comprising an expansion material containing an ettringite-forming substance and / or quicklime as an active ingredient.
[4] The cement composition according to any one of [1] to [3], comprising the crack-preventing admixture according to any one of [1] to [3] and cement.
本発明のひび割れ防止用混和材は、モルタル等のセメント組成物に混和することで、優れた乾燥収縮低減作用を発現して乾燥ひび割れの発生を著しく抑制でき、しかも、界面活性成分の導入によって発生し易くなる白華も抑制でき、色ムラも起こり難いので、表面美観を損なわずして乾燥ひび割れが入り難いセメント組成物を得ることができる。 The admixture for preventing cracks according to the present invention is able to significantly reduce the occurrence of dry cracks by mixing with a cement composition such as mortar, and can effectively suppress the occurrence of dry cracks. Since it is also possible to suppress white blossoms that are easily formed and color unevenness hardly occurs, it is possible to obtain a cement composition that does not easily cause dry cracks without impairing the surface appearance.
本発明の乾燥ひび割れ防止用混和材は、有機系の界面活性物質を有効成分とする有機系収縮低減剤を必須含有する。このような有機系の界面活性物質としては、モルタルやコンクリートに使用でき、乾燥収縮の抑制作用を有するものであれば特に限定されない。具体例として、低級アルコールアルキレンオキシド付加物、ポリエーテル、グリコールエーテル誘導体、プロピレングリコールエーテル類等が挙げられる。好ましくは、特に強力な乾燥収縮抑制作用を有することから、低級アルコールアルキレンオキシド付加物を有効成分とするものが推奨される。本発明の乾燥ひび割れ防止用混和材中の有機系収縮低減剤の含有量は、特に制限されるものではないが、好ましくは５〜８０質量％とする。５質量％未満ではひび割れ低減効果が十分得られないことがあって適当ではなく、また、８０質量％を超えると硬化体の表面美観が低下する場合があるので適当ではない。 The admixture for preventing dry cracking of the present invention essentially contains an organic shrinkage reducing agent containing an organic surfactant as an active ingredient. Such an organic surfactant is not particularly limited as long as it can be used for mortar and concrete and has an effect of suppressing drying shrinkage. Specific examples include lower alcohol alkylene oxide adducts, polyethers, glycol ether derivatives, propylene glycol ethers, and the like. Preferably, those having a lower alcohol alkylene oxide adduct as an active ingredient are recommended because they have a particularly strong drying shrinkage-inhibiting action. The content of the organic shrinkage reducing agent in the dry crack preventing admixture of the present invention is not particularly limited, but is preferably 5 to 80% by mass. If it is less than 5% by mass, the effect of reducing cracks may not be sufficiently obtained, which is not suitable. If it exceeds 80% by mass, the surface appearance of the cured product may be deteriorated.
また、本発明の乾燥ひび割れ防止用混和材は、珪藻土を必須含有する。珪藻土は、珪藻の殻の化石の堆積物からなるもので、二酸化ケイ素を主成分し、一般に連通する開口気孔が気孔の大部分を占める多孔質体である。珪藻土を含有することで、セメント組成物の白華発生の抑制や色斑等も発生し難くなり、美感向上に寄与する。本発明では、例えば濾過剤や建材用として一般に市販されている珪藻土なら何れのものでも使用でき、特に限定はされない。使用に際し、好ましくは粒径を概ね５〜３０μｍ程度にすべく粉砕する。このような粒度調整を施すと混和時の混合性がより良好になる。また、本発明の乾燥ひび割れ防止用混和材中の珪藻土の含有量は、特に制限されるものではない。好ましくは、前記有機系収縮低減剤の含有量１００質量部に対し、３０〜１０００質量部含有すれば良い。３０質量部未満の含有量では白華発生を抑制し難くなることがあるので適当ではなく、１００質量部を超えると強度発現性が低下することがあるので適当ではない。 Moreover, the admixture for preventing dry cracking of the present invention contains diatomaceous earth as an essential component. Diatomaceous earth is composed of fossil deposits of diatom shell, and is a porous body mainly composed of silicon dioxide and generally having open pores that communicate with most of the pores. By containing diatomaceous earth, it is difficult for the cement composition to suppress the generation of white flower and color spots, thereby contributing to an improvement in aesthetics. In the present invention, any diatomaceous earth that is generally commercially available for use as, for example, a filtering agent or building material can be used, and is not particularly limited. In use, it is preferably pulverized to have a particle size of about 5 to 30 μm. When such particle size adjustment is performed, the mixing property at the time of mixing becomes better. Moreover, the content of diatomaceous earth in the admixture for preventing dry cracking of the present invention is not particularly limited. Preferably, 30 to 1000 parts by mass may be contained with respect to 100 parts by mass of the organic shrinkage reducing agent. If the content is less than 30 parts by mass, it may be difficult to suppress the occurrence of white flower, and if it exceeds 100 parts by mass, strength development may be reduced.
また、本発明の乾燥ひび割れ防止用混和材は、好ましくは、さらに石灰石粉を含有する乾燥ひび割れ防止用混和材混和材である。石灰石粉は、ブレーン比表面積３５００ｃｍ2／ｇ以上の粉末が好適に使用できる。ブレーン比表面積３５００ｃｍ2／ｇ未満のものは、セメント組成物中に均一分散し難くなるので適当ではない。石灰石粉は、水性スラリー化するとセメント組成物中で発生するカルシウムイオンの炭酸化を促進し、組成物内部に固定化する作用を具備し、よって水分蒸発プロセスに伴ってセメント組成物表面に浮上するカルシウムイオンを激減でき、白華現象を防ぐことができる。この作用は前記の珪藻土による白華抑制作用を補完し、より強力に白華を防ぐことができる。また、本発明の乾燥ひび割れ防止用混和材中の石灰石粉の含有量は、特に制限されるものではない。好ましくは、前記有機系収縮低減剤の含有量１００質量部に対し、５００〜２０００質量部含有すれば良い。石灰石粉の含有量が５００質量部未満では配合効果が実質得られ無いことがあるので適当ではなく、また２０００質量部を超えると強度発現性が低下し易くなるので適当ではない。 The dry crack preventing admixture of the present invention is preferably a dry crack preventing admixture further containing limestone powder. As the limestone powder, a powder having a brain specific surface area of 3500 cm 2 / g or more can be preferably used. Those having a brain specific surface area of less than 3500 cm 2 / g are not suitable because they are difficult to uniformly disperse in the cement composition. Limestone powder promotes the carbonation of calcium ions generated in the cement composition when it is made into an aqueous slurry, and has an action of fixing inside the composition. Therefore, the limestone powder floats on the cement composition surface along with the water evaporation process. Calcium ions can be drastically reduced, and the white flower phenomenon can be prevented. This action complements the white bloom suppression action by the diatomaceous earth, and can prevent white bloom more strongly. Further, the content of limestone powder in the admixture for preventing dry cracking of the present invention is not particularly limited. Preferably, the organic shrinkage reducing agent may be contained in an amount of 500 to 2000 parts by mass with respect to 100 parts by mass of the organic shrinkage reducing agent. If the content of limestone powder is less than 500 parts by mass, the blending effect may not be substantially obtained, so that it is not appropriate, and if it exceeds 2000 parts by mass, the strength development tends to decrease, so that it is not appropriate.
また、本発明のひび割れ防止用混和材は、好ましくは、さらにエトリンガイト生成物質及び／又は生石灰を有効成分とする膨張材を含有するひび割れ防止用混和材である。膨張材を含有によってより強力なひび割れ抑制効果を得ることができる。エトリンガイト生成物質とは、水和反応によってエトリンガイトを生成できる物質であれば特に限定されない。具体例としては、カルシウムアルミネートと石膏の混合物、又はカルシウムサルホアルミネート等を挙げることができる。エトリンガイト生成物質を有効成分とする膨張材と生石灰を有効成分とする膨張材を併用することもでき、その場合の両者の含有割合は制限されない。使用する膨張材の粒度は特に限定されない。また、本発明のひび割れ防止用混和材中の膨張材の含有量は、特に制限されるものではない。好ましくは、前記有機系収縮低減剤の含有量１００質量部に対し、１００〜２０００質量部含有すれば良い。膨張材の含有量が１００質量部未満では配合効果が実質得られ無いことがあるので適当ではなく、また２０００質量部を超えると過膨張による膨張亀裂が発生することがあるので適当ではない。 In addition, the crack-preventing admixture of the present invention is preferably a crack-preventing admixture further containing an expansion material containing an ettringite-forming substance and / or quicklime as an active ingredient. By containing the intumescent material, a stronger cracking suppression effect can be obtained. The ettringite-producing substance is not particularly limited as long as it is a substance that can produce ettringite by a hydration reaction. Specific examples include a mixture of calcium aluminate and gypsum or calcium sulfoaluminate. An expansion material containing an ettringite-producing substance as an active ingredient and an expansion material containing quick lime as an active ingredient can be used in combination, and the content ratios of both in this case are not limited. The particle size of the expansion material to be used is not particularly limited. In addition, the content of the expansion material in the crack-preventing admixture of the present invention is not particularly limited. Preferably, the organic shrinkage reducing agent may be contained in an amount of 100 to 2000 parts by mass with respect to 100 parts by mass of the organic shrinkage reducing agent. If the content of the expansion material is less than 100 parts by mass, the blending effect may not be substantially obtained, which is not appropriate. If the content exceeds 2000 parts by mass, expansion cracks due to overexpansion may occur.
また、本発明のセメント組成物は、前記本発明による乾燥ひび割れ防止用混和材とセメントと水を含有してなるものである。セメントは何れのものでも使用でき、具体的には、例えば普通、早強、超早強、中庸熱、低熱等の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のような各種混合セメント、白色セメント、エコセメント又はアルミナセメントのような特殊セメント等を挙げることができ、二種以上併用しても良い。各構成材の配合量は特に限定されない。好ましくはセメント１００質量部に対し、前記本発明によるひび割れ防止用混和材０．２〜１５質量部、水２０〜１００質量部を含有したものとする。該混和材０．２質量部未満では十分な白華防止効果が得られないことがあるので適当ではなく、また、１５質量部を超えると強度発現性が低下することがあるため適当ではない。また水が、２０質量部未満では特に左官工法などで施工する場合の施工性が低下し易くなるので適当ではなく、１００質量部を超えると強度低下を起こすことがあるので適当ではない。本発明のセメント組成物は、前記以外の配合成分、例えば細骨材、減水剤（分散剤）、撥水剤、保水剤、ポゾラン反応性物質、繊維、増粘剤等を、本発明の効果を喪失させない範囲で含有するものであっても良い。 The cement composition of the present invention comprises the admixture for preventing dry cracking according to the present invention, cement and water. Any cement can be used. Specifically, for example, various ordinary portland cements such as normal, early strength, super early strength, moderate heat, low heat, various mixed cements such as blast furnace cement and fly ash cement, white cement, Special cements such as eco-cement or alumina cement can be used, and two or more kinds may be used in combination. The amount of each constituent material is not particularly limited. Preferably, 0.2 to 15 parts by mass of the crack preventing admixture according to the present invention and 20 to 100 parts by mass of water are contained per 100 parts by mass of cement. If the admixture is less than 0.2 part by mass, a sufficient effect of preventing whitening may not be obtained, and if it exceeds 15 parts by mass, strength development may be reduced. Further, when the amount of water is less than 20 parts by mass, the workability particularly when the construction is performed by the plastering method is likely to be deteriorated, so that it is not appropriate, and when it exceeds 100 parts by mass, the strength may be lowered. The cement composition of the present invention contains other components, such as fine aggregate, water reducing agent (dispersing agent), water repellent, water retention agent, pozzolanic reactive substance, fiber, thickener and the like. May be contained within a range that does not cause loss.
以下、実施例により本発明を具体的に詳しく説明するが、本発明はここに表す実施例に限定されるものではない。 EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples shown here.
次のＡ１〜Ｅから選定された材料を用い、表１に記載の配合量となるよう小型粉体ミキサーに入れ６０秒間常温下で混合し、混和材を作製した。
Ａ１；低級アルコールアルキレンオキシド付加物を有効成分とする収縮低減剤（太平洋マテリアル社製「テトラガード」）
Ａ２；ポリエーテル誘導体を有効成分とする収縮低減剤（竹本油脂社製「ヒビダン」）
Ｂ；淡水産珪藻土（嵩密度０．４５ｇ／ｃｍ3、平均粒径１２μｍ）
Ｃ；石灰石粉（ＣａＣＯ3含有量＞９５％、ブレーン比表面積４０００ｃｍ2／ｇ）
Ｄ１；セピオライト（直径約０．１μｍ、長さ約５μｍの針状結晶体）
Ｄ２；アタパルジャイト（平均粒径４μｍの含水マグネシウムケイ酸塩系粘土鉱物）
Ｅ；生石灰系膨張材（太平洋マテリアル社製「エクスパン構造用」）
Using materials selected from the following A1 to E, the mixture was placed in a small powder mixer so as to achieve the blending amounts shown in Table 1, and mixed at room temperature for 60 seconds to prepare an admixture.
A1: Shrinkage reducing agent comprising “lower alcohol alkylene oxide adduct” as an active ingredient (“Tetragard” manufactured by Taiheiyo Materials Co., Ltd.)
A2: Shrinkage reducing agent comprising a polyether derivative as an active ingredient (“Hibidan” manufactured by Takemoto Yushi Co., Ltd.)
B: Freshwater diatomaceous earth (bulk density 0.45 g / cm 3 , average particle size 12 μm)
C: Limestone powder (CaCO 3 content> 95%, Blaine specific surface area 4000 cm 2 / g)
D1: Sepiolite (needle crystal having a diameter of about 0.1 μm and a length of about 5 μm)
D2: Attapulgite (hydrous magnesium silicate clay mineral with an average particle size of 4 μm)
E: Quicklime expansion material ("Expan structure" manufactured by Taiheiyo Materials Co., Ltd.)
次いで、該混和材と次のＦ〜Ｈ２から選定される材料及び水を用い、表２に記載する配合量となるようホバートミキサーに入れ１２０秒間常温下で混合し、モルタルを作製した。
Ｆ；普通ポルトランドセメント（太平洋セメント株式会社製）
Ｇ；細骨材（山形産珪砂、Ｆ.Ｍ.＝２．５）
Ｈ１；メチルセルロース系増粘剤（松本油脂株式会社製「マーポローズ９０ＭＰ−４Ｔ」）
Ｈ２；ナフタレンスルホン酸系高性能減水剤（花王社製「マイティ−１００」）
Next, using the admixture, materials selected from the following F to H2, and water, the mixture was placed in a Hobart mixer so as to have the blending amounts shown in Table 2, and mixed at room temperature for 120 seconds to prepare a mortar.
F: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)
G: Fine aggregate (Yamagata quartz sand, FM = 2.5)
H1: Methylcellulose thickener (Matsumoto Yushi Co., Ltd. “Marporose 90MP-4T”)
H2: Naphthalenesulfonic acid-based high-performance water reducing agent (“Mighty-100” manufactured by Kao Corporation)
このモルタルに対し、次の（１）〜（３）の評価を行った。その結果を表３に表す。
（１）白華防止等による美観向上性の評価；コンクリート製平板の一表面（１０００×２０００ｍｍ）に、モルタルを厚さ１０ｍｍとなるよう鏝塗りし、気温約５〜２０℃の屋外環境下に７日間放置した。放置後の白華発生状況を調べ、肉眼で明白に白華が確認されなかったものを白華発生無しと判断し、白華防止ができた（○）と評価した。また、また、白華は明白には認められなかったが、色ムラが見られたものを美観未向上（△）とした。これら以外の状態のものはを白華防止できていない（×）と評価した。
The following (1) to (3) were evaluated for this mortar. The results are shown in Table 3.
(1) Evaluation of aesthetic improvement by prevention of white flower, etc .; one surface of a concrete flat plate (1000 × 2000 mm) is coated with mortar so as to have a thickness of 10 mm under an outdoor environment at a temperature of about 5 to 20 ° C. Left for 7 days. The white-wax generation after the standing was examined, and when no white-wax was clearly confirmed with the naked eye, it was judged that no white-was occurred, and it was evaluated that white-was prevention was possible (O). In addition, although white flower was not clearly recognized, a color unevenness was regarded as unaesthetic improvement (Δ). Those in states other than these were evaluated as being unable to prevent white bloom (x).
（２）ひび割れ抵抗性；前記と同様のコンクリート平板上にモルタルを厚さ１０ｍｍとなるよう鏝塗りし、同様の環境下で２８日間放置後のモルタル表面のひび割れ発生状況を目視で調べた。ひび割れが明白には見られなかったものをひび割れ抵抗性あり（○）と評価し、それ以外の状況となったものをひび割れ抵抗性が劣る（×）と評価した。 (2) Crack resistance: The mortar was coated with a thickness of 10 mm on the same concrete flat plate as described above, and the occurrence of cracks on the surface of the mortar after standing for 28 days in the same environment was visually examined. Those in which no cracks were clearly seen were evaluated as having crack resistance (O), and those in other situations were evaluated as having poor crack resistance (X).
（３）圧縮強度；作製したモルタルの材齢２８日試験体（寸法４０×４０×１６０ｍｍ）に対し、ＪＩＳ Ｒ ５２０１に準じた方法で圧縮強度を測定した。 (3) Compressive strength: The compressive strength was measured by the method according to JISR5201 with respect to the 28-day-old test body (size 40x40x160mm) of the produced mortar.
表３の結果より、本発明の混和材を使用したモルタルは、何れもひび割れが確認されずしかも白華等の美観性低下に繋がる現象も起こっていないことがわかる。しかも、本発明によるモルタルは、圧縮強度を始めとす硬化体物性に支障を生じることなく所定の効果が得られたことがわかる。 From the results of Table 3, it can be seen that the mortar using the admixture of the present invention does not cause any cracks and does not cause a phenomenon that leads to a decrease in aesthetics such as white flower. Moreover, it can be seen that the mortar according to the present invention has obtained a predetermined effect without causing any trouble in the physical properties of the cured body such as compressive strength.
Claims (4)
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| JPWO2014147730A1 (en) * | 2013-03-18 | 2017-02-16 | 富士通株式会社 | Package structure |
| JP2017065958A (en) * | 2015-09-29 | 2017-04-06 | 太平洋セメント株式会社 | Powdery cement composition for plasterer and mortar for plasterer |
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| JPS63242951A (en) * | 1987-03-31 | 1988-10-07 | 日本セメント株式会社 | Method of preventing efflorescence of mortar or concrete hardened body |
| JPH10139508A (en) * | 1996-11-01 | 1998-05-26 | Ube Ind Ltd | Self-shrinkage reducing agent for cement, cement composition and method for reducing self-shrinkage of cement |
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| JPS63242951A (en) * | 1987-03-31 | 1988-10-07 | 日本セメント株式会社 | Method of preventing efflorescence of mortar or concrete hardened body |
| JPH10139508A (en) * | 1996-11-01 | 1998-05-26 | Ube Ind Ltd | Self-shrinkage reducing agent for cement, cement composition and method for reducing self-shrinkage of cement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPWO2014147730A1 (en) * | 2013-03-18 | 2017-02-16 | 富士通株式会社 | Package structure |
| US9704090B2 (en) | 2013-03-18 | 2017-07-11 | Fujitsu Limited | Package structure |
| JP2017065958A (en) * | 2015-09-29 | 2017-04-06 | 太平洋セメント株式会社 | Powdery cement composition for plasterer and mortar for plasterer |
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