JP2021138567A - Cement composition, and ultra-high strength and low shrinkage mortar composition - Google Patents
Cement composition, and ultra-high strength and low shrinkage mortar composition Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 48
- 239000004568 cement Substances 0.000 title claims abstract description 39
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 29
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 23
- 238000004017 vitrification Methods 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 10
- 239000005354 aluminosilicate glass Substances 0.000 claims abstract description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 13
- 239000012615 aggregate Substances 0.000 claims description 13
- 239000002270 dispersing agent Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 11
- 239000004567 concrete Substances 0.000 abstract description 8
- 239000005368 silicate glass Substances 0.000 abstract description 3
- 239000000377 silicon dioxide Substances 0.000 abstract description 3
- 229910052681 coesite Inorganic materials 0.000 abstract 2
- 229910052906 cristobalite Inorganic materials 0.000 abstract 2
- 235000012239 silicon dioxide Nutrition 0.000 abstract 2
- 229910052682 stishovite Inorganic materials 0.000 abstract 2
- 229910052905 tridymite Inorganic materials 0.000 abstract 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000010440 gypsum Substances 0.000 description 11
- 229910052602 gypsum Inorganic materials 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 239000011398 Portland cement Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 229910021487 silica fume Inorganic materials 0.000 description 5
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000011372 high-strength concrete Substances 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000006072 paste Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
本発明は、建設用途などに用いる超高強度モルタル・コンクリートに関する。 The present invention relates to ultra-high strength mortar / concrete used for construction purposes and the like.
従来より、建設用途などにおいて使用されるセメントペースト・モルタル・コンクリート等に関し、シリカフューム等の超微粉末を添加して高強度性を付与する技術は既に知られている（例えば特許文献１参照）。現状では、シリカフューム微粉末を添加し、低水結合材比とすることによって、圧縮強度１００Ｎ／ｍｍ２を超えるような超高強度コンクリートが設計されている。 Conventionally, with respect to cement paste, mortar, concrete and the like used in construction applications and the like, a technique of adding ultrafine powder such as silica fume to impart high strength has already been known (see, for example, Patent Document 1). At present, ultra-high-strength concrete having a compressive strength of more than 100 N / mm 2 is designed by adding silica fume fine powder to a low water-bonding material ratio.
しかしながら、高強度コンクリートでは、圧縮強度確保のためにセメント等の結合材量を増やさざるを得ず、水和等に伴う材令初期からの収縮を抑制することが困難であった。
本発明は、圧縮強度１００Ｎ／ｍｍ２を超えるような超高強度モルタル・コンクリートであっても、十分な圧縮強度を維持したまま収縮量を抑制可能な、超高強度・低収縮モルタル組成物を提供することを目的とする。
However, in high-strength concrete, the amount of binder such as cement has to be increased in order to secure the compressive strength, and it is difficult to suppress the shrinkage from the initial stage of the material age due to hydration and the like.
The present invention provides an ultra-high-strength, low-shrinkage mortar composition capable of suppressing the amount of shrinkage while maintaining a sufficient compressive strength even in an ultra-high-strength mortar / concrete having a compressive strength of more than 100 N / mm 2. The purpose is to provide.
本発明者らは、鋭意検討した結果、ポルトランドセメントに対して、２種類の異なる組成のガラス質材料を併用することにより、圧縮強度１００Ｎ／ｍｍ２を超えるような超高強度を維持したまま、初期の収縮を低減できることを見出し、本発明を完成させた。
すなわち、本発明は、以下の構成によって上記課題を解決したセメント組成物及び超高強度・低収縮モルタル組成物に関する。
［１］セメントと、下記の２種類のガラス質材料と、無水石膏とを含有するセメント組成物。（１）ガラス化率が８０％以上であって、ガラス質部分の化学組成がＳｉＯ２９０質量％以上であるシリケートガラス粉末、（２）ガラス化率が８０％以上であって、ガラス質部分の化学組成がＡｌ２Ｏ３４０〜５０質量％及びＳｉＯ２５０〜６０質量％であるアルミノシリケートガラス粉末
［２］前記セメント組成物、分散剤、骨材及び水を含有し、セメント組成物１００質量部に対して、水が１８〜３２質量部である超高強度・低収縮モルタル組成物。
As a result of diligent studies, the present inventors have conducted a combination of two types of glassy materials having different compositions with respect to Portland cement, while maintaining an ultra-high strength exceeding 100 N / mm 2 in compressive strength. We have found that the initial shrinkage can be reduced and completed the present invention.
That is, the present invention relates to a cement composition and an ultra-high strength / low shrinkage mortar composition which have solved the above problems by the following configurations.
[1] A cement composition containing cement, the following two types of glassy materials, and anhydrous gypsum. (1) A is vitrification of 80% or more, glass powder the chemical composition of the glassy portion is SiO 2 90% by mass or more, there is (2) the vitrification of 80% or more, the glass material portion Aluminosilicate glass powder having a chemical composition of Al 2 O 3 40 to 50% by mass and SiO 2 50 to 60% by mass [2] The cement composition 100 containing the cement composition, dispersant, aggregate and water. An ultra-high strength, low shrinkage mortar composition in which water is 18 to 32 parts by mass with respect to parts by mass.
本発明では、建設用途などに用いる超高強度モルタル・コンクリートに関し、圧縮強度１００Ｎ／ｍｍ２を超えるような超高強度を維持したまま、初期の収縮を低減可能なセメント組成物及びそれを用いた超強度・低収縮モルタル組成物を提供することができる。 In the present invention, with respect to ultra-high-strength mortar / concrete used for construction purposes, a cement composition capable of reducing initial shrinkage while maintaining ultra-high strength exceeding a compressive strength of 100 N / mm 2 and a cement composition thereof are used. An ultra-strong, low-shrink mortar composition can be provided.
以下、本発明を具体的に説明する。
＜セメント組成物＞
本発明におけるセメント組成物は、セメントと、２種類のガラス質材料と、無水石膏とを含有する。
Hereinafter, the present invention will be specifically described.
<Cement composition>
The cement composition in the present invention contains cement, two types of vitreous materials, and anhydrous gypsum.
本発明で用いるセメントとしては、ポルトランドセメント、混合セメント等が挙げられるが、強度発現性や収縮抑制の観点から、ポルトランドセメントであることが好ましい。セメントは一種を単独で使用してもよく、または二種以上を組み合わせて使用してもよい。 Examples of the cement used in the present invention include Portland cement and mixed cement, but Portland cement is preferable from the viewpoint of strength development and shrinkage suppression. One type of cement may be used alone, or two or more types may be used in combination.
本発明で用いるガラス質材料は、２種類の異なる組成のガラス質材料が使用される。
第１のガラス質材料（１）は、ガラス化率は８０％以上であって、ガラス質部分の化学組成がＳｉＯ２９０質量％以上であるシリケートガラス粉末である。
高強度を確保する観点から、ガラス化率は８０％以上が必要であり、９０％以上であることがより好ましい。また、ガラス質部分の化学組成は、低収縮性を確保す観点から、ＳｉＯ２９０質量％以上であることが必要であり、９５質量％以上であることが好ましい。このようなシリケートガラス粉末としては、シリカフューム等が該当する。シリケートガラス粉末の粉末度は、ＢＥＴ比表面積で１０〜２５ｍ２／ｇが好ましい。
As the vitreous material used in the present invention, two kinds of vitreous materials having different compositions are used.
First vitreous material (1), the glass rate is a 80% or more, the chemical composition of the glassy portion is glass powder is SiO 2 90% by mass or more.
From the viewpoint of ensuring high strength, the vitrification rate needs to be 80% or more, and more preferably 90% or more. The chemical composition of the glass material portion, in view to ensure the low shrinkage is required to be SiO 2 90 wt% or more, is preferably at least 95 wt%. Silica fume and the like correspond to such silicate glass powder. The powderiness of the silicate glass powder is preferably 10 to 25 m 2 / g in terms of BET specific surface area.
第２のガラス質材料（２）は、ガラス化率が８０％以上であって、ガラス質部分の化学組成がＡｌ２Ｏ３４０〜５０質量％及びＳｉＯ２５０〜６０質量％であるアルミノシリケートガラス粉末である。
高強度を確保する観点から、ガラス化率は８０％以上が必要であり、９０％以上であることがより好ましい。また、ガラス質部分の化学組成は、Ａｌ２Ｏ３４０〜５０質量％及びＳｉＯ２５０〜６０質量％であることが必要である。ＳｉＯ２が５０質量％未満であると、ガラス化することが困難であり、またＡｌ２Ｏ３が４０質量％未満であると収縮が過大となる虞がある。このようなアルミノシリケートガラス粉末としては、メタカオリン等が該当する。アルミノシリケートガラス粉末の粉末度は、ＢＥＴ比表面積で６〜１５ｍ２／ｇが好ましい。
The second vitreous material (2) is an aluminosilicate having a vitrification rate of 80% or more and a chemical composition of the vitreous portion of Al 2 O 3 40 to 50% by mass and SiO 2 50 to 60% by mass. It is a glass powder.
From the viewpoint of ensuring high strength, the vitrification rate needs to be 80% or more, and more preferably 90% or more. Further, the chemical composition of the vitreous portion needs to be Al 2 O 3 40 to 50% by mass and SiO 2 50 to 60% by mass. If SiO 2 is less than 50% by mass, it is difficult to vitrify, and if Al 2 O 3 is less than 40% by mass, shrinkage may be excessive. Examples of such aluminosilicate glass powder include metakaolin and the like. The powderiness of the aluminosilicate glass powder is preferably 6 to 15 m 2 / g in terms of BET specific surface area.
本発明で用いる無水石膏としては、天然無水石膏、副生物として製造されるフッ酸無水石膏等、廃石膏ボードから製造される再生無水石膏等が挙げられる。無水石膏の形態としては、Ｉ型、II型、III型が挙げられるが、この中でII型無水石膏が好ましい。II型無水石膏を用いることによって、特に初期の収縮を抑制できる可能性がある。無水石膏の粉末度は、ブレーン比表面積で３０００〜２００００ｃｍ２／ｇが好ましい。 Examples of the anhydrous gypsum used in the present invention include natural anhydrous gypsum, hydrofluoric anhydride produced as a by-product, regenerated anhydrous gypsum produced from waste gypsum board, and the like. Examples of the form of anhydrous gypsum include type I, type II, and type III, and among these, type II anhydrous gypsum is preferable. By using type II anhydrous gypsum, it may be possible to suppress the initial shrinkage in particular. The powderiness of anhydrous gypsum is preferably 3000 to 20000 cm 2 / g in terms of specific surface area of brain.
本発明のセメント組成物における各構成材料の配合は、セメントが５０〜８５質量％、ガラス質材料（１）が５〜１５質量％、ガラス質材料（２）が５〜１５質量％、無水石膏が１〜１５質量％であることが好ましい。 The composition of each constituent material in the cement composition of the present invention is as follows: cement is 50 to 85% by mass, glassy material (1) is 5 to 15% by mass, glassy material (2) is 5 to 15% by mass, and anhydrous gypsum. Is preferably 1 to 15% by mass.
＜高強度・低収縮モルタル組成物＞
本発明における高強度・低収縮モルタル組成物は、上記セメント組成物、分散剤、骨材及び水を含有する。ここでモルタル組成物とは、骨材として粗骨材を使用したコンクリート組成物も含むものとする。
<High-strength, low-shrinkage mortar composition>
The high-strength, low-shrink mortar composition in the present invention contains the above-mentioned cement composition, dispersant, aggregate and water. Here, the mortar composition also includes a concrete composition using a coarse aggregate as the aggregate.
本発明に用いる骨材としては、通常モルタル、コンクリートに用いる砕砂、川砂、海砂等の細骨材、砕石等の粗骨材を用いることができるが、強度発現性の観点より、骨材自体の圧縮強度が高いものを用いることが好ましく、圧縮強度の低い軽量骨材は除かれる。骨材の配合量としては、セメント組成物１００質量部に対して、８０〜８００質量部が好ましい。 As the aggregate used in the present invention, fine aggregates such as mortar, crushed sand, river sand and sea sand usually used for concrete, and coarse aggregates such as crushed stone can be used, but from the viewpoint of strength development, the aggregate itself It is preferable to use a material having a high compressive strength, and a lightweight aggregate having a low compressive strength is excluded. The amount of the aggregate to be blended is preferably 80 to 800 parts by mass with respect to 100 parts by mass of the cement composition.
本発明で用いる分散剤としては、通常モルタル、コンクリートに用いる各種減水剤を用いることができるが、高強度配合とした際に流動性確保が容易である点より、ポリカルボン酸塩系のものであることが好ましい。分散剤の添加量としては、セメント組成物１００質量部に対して、固形分換算で０．０５〜１質量部が好ましい。 As the dispersant used in the present invention, various water reducing agents usually used for mortar and concrete can be used, but polycarboxylic acid salts are used because it is easy to secure fluidity when a high-strength compound is used. It is preferable to have. The amount of the dispersant added is preferably 0.05 to 1 part by mass in terms of solid content with respect to 100 parts by mass of the cement composition.
本発明に用いる水は、水道水、地下水など、任意のものを用いることができる。水の配合量としては、高強度及び施工性確保の観点から、セメント組成物１００質量部に対して、１８〜３２質量部が好ましく、２０〜３０質量部がより好ましい。 As the water used in the present invention, any water such as tap water and groundwater can be used. The amount of water to be blended is preferably 18 to 32 parts by mass and more preferably 20 to 30 parts by mass with respect to 100 parts by mass of the cement composition from the viewpoint of ensuring high strength and workability.
本発明の効果を損なわないものであれば、上記以外の成分を含有することができる。このような成分として、例えば、膨張材、収縮低減剤、消泡剤、ＡＥ剤、珪石粉や石灰石微粉末等の無機微粉末、繊維、顔料などが挙げられる。 Ingredients other than the above can be contained as long as the effects of the present invention are not impaired. Examples of such components include expansion materials, shrinkage reducing agents, defoaming agents, AE agents, inorganic fine powders such as silica stone powder and limestone fine powder, fibers, and pigments.
以下、本発明の実施例を比較例と共に示すが、本発明は記載した実施例に限定されるものではない。 Hereinafter, examples of the present invention will be shown together with comparative examples, but the present invention is not limited to the described examples.
＜セメント組成物及びモルタル組成物の調製＞
表１の配合割合で、２０℃恒温度試験室内にて、ハンドミキサ（東芝製、回転速度１０００ｒｐｍ）で３分間混練し、試験用の試料を作製した。
以下に使用材料を示す。
なお、分散剤は添加量は、ＪＩＳ Ｒ ５２０１に従って測定したフロー値が１５０±２０ｍｍとなるよう調整した。
・セメント；普通ポルトランドセメント（太平洋セメント社製）
・ガラス質材料Ａ；ガラス化率；＞９５％、ガラス質部分のＳｉＯ２；９５％（市販シリカフューム）
・ガラス質材料Ｂ；ガラス化率；９１％、ガラス質部分のＳｉＯ２；５１％、ガラス質部分のＡｌ２Ｏ３；４７％
・ガラス質材料Ｃ；ガラス化率；８０％、ガラス質部分のＳｉＯ２；５２％、ガラス質部分のＡｌ２Ｏ３；４３％
・ガラス質材料Ⅾ；ガラス化率；８１％、ガラス質部分のＳｉＯ２；６５％、ガラス質部分のＡｌ２Ｏ３；２０％
・ガラス質材料Ｅ；ガラス化率；４５％、ガラス質部分のＳｉＯ２；５１％、ガラス質部分のＡｌ２Ｏ３；４３％
・石膏ａ；II型無水石膏（太平洋マテリアル社製、フッ酸無水石膏）
・石膏ｂ；III型無水石膏（ナコード社製、石膏ボード原料からの再生無水石膏）
・石膏ｃ；Ｉ型無水石膏（石膏ａを電気炉内で１２００℃で焼成して作製）
・骨材；ＪＩＳ Ｒ ５２０１ セメントの強さ試験用標準砂（セメント協会・研究所製）
・水；水道水
・分散剤；ポリカルボン酸系高性能減水剤コアフロー（太平洋マテリアル社製）
<Preparation of cement composition and mortar composition>
A sample for testing was prepared by kneading with a hand mixer (manufactured by Toshiba, rotating speed 1000 rpm) for 3 minutes in a constant temperature test room at 20 ° C. at the blending ratio shown in Table 1.
The materials used are shown below.
The amount of the dispersant added was adjusted so that the flow value measured according to JIS R 5201 was 150 ± 20 mm.
・ Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement)
-Grain quality material A; vitrification rate;> 95%, SiO 2 in the glassy part; 95% (commercially available silica fume)
-Grain quality material B; vitrification rate; 91%, SiO 2 in the glassy part; 51%, Al 2 O 3 in the glassy part; 47%
-Grain quality material C; vitrification rate; 80%, SiO 2 in the glassy part; 52%, Al 2 O 3 in the glassy part; 43%
-Grain quality Ⅾ; Vitrification rate; 81%, SiO 2 in the glassy part; 65%, Al 2 O 3 in the glassy part; 20%
-Grain quality material E; vitrification rate; 45%, SiO 2 in the glassy part; 51%, Al 2 O 3 in the glassy part; 43%
-Gypsum a; Type II anhydrous gypsum (manufactured by Pacific Material Co., Ltd., hydrofluoric acid anhydrous gypsum)
-Gypsum b; Type III anhydrous gypsum (manufactured by Nacord, regenerated anhydrous gypsum from gypsum board raw material)
-Gypsum c; type I anhydrous gypsum (made by firing gypsum a at 1200 ° C in an electric furnace)
-Aggregate: JIS R 5201 Standard sand for cement strength test (manufactured by Cement Association / Research Institute)
・ Water; tap water / dispersant; polycarboxylic acid-based high-performance water reducing agent Core Flow (manufactured by Pacific Materials Co., Ltd.)
＜評価試験＞
１）圧縮強度の測定
直径５ｃｍ×１０ｃｍの型枠に各モルタル組成物を充填し、２０℃の水槽内にて２８日間養生した後、ＪＩＳ Ａ １１０８に準拠して圧縮強度を測定した。
２）収縮量の測定
直径４ｃｍ×４ｃｍ×１６ｃｍの型枠に各モルタル組成物を充填し、２０℃湿空箱内に静置して２４時間後に脱型した後に、２０℃で６０％Ｒ．Ｈ．の恒温度試験室内にて試験体を静置し、２８日後にＪＩＳ Ａ １１２９に準拠した手法で収縮量を測定し、初期収縮の指標とした。
<Evaluation test>
1) Measurement of compressive strength Each mortar composition was filled in a mold having a diameter of 5 cm × 10 cm, cured in a water tank at 20 ° C. for 28 days, and then the compressive strength was measured according to JIS A 1108.
2) Measurement of shrinkage amount Each mortar composition was filled in a mold having a diameter of 4 cm × 4 cm × 16 cm, allowed to stand in a wet box at 20 ° C., demolded after 24 hours, and then 60% R. at 20 ° C. H. The test piece was allowed to stand in the constant temperature test room, and 28 days later, the amount of shrinkage was measured by a method conforming to JIS A 1129, which was used as an index of initial shrinkage.
＜試験結果＞
試験結果を表２に示す。本発明品では、圧縮強度が１００Ｎ／ｍｍ２を超え、かつ、収縮量が抑制されていることが分かる。
<Test results>
The test results are shown in Table 2. It can be seen that in the product of the present invention, the compressive strength exceeds 100 N / mm 2 and the shrinkage amount is suppressed.
＜セメント組成物及びモルタル組成物の調製＞
表１の配合割合で、２０℃恒温度試験室内にて、ハンドミキサ（東芝製、回転速度１０００ｒｐｍ）で３分間混練し、試験用の試料を作製した。
以下に使用材料を示す。
なお、分散剤の添加量は、ＪＩＳ Ｒ ５２０１に従って測定したフロー値が１５０±２０ｍｍとなるよう調整した。
・セメント；普通ポルトランドセメント（太平洋セメント社製）
・ガラス質材料Ａ；ガラス化率；＞９５％、ガラス質部分のＳｉＯ２；９５％（市販シリカフューム）
・ガラス質材料Ｂ；ガラス化率；９１％、ガラス質部分のＳｉＯ２；５１％、ガラス質部分のＡｌ２Ｏ３；４７％
・ガラス質材料Ｃ；ガラス化率；８０％、ガラス質部分のＳｉＯ２；５２％、ガラス質部分のＡｌ２Ｏ３；４３％
・ガラス質材料Ｄ；ガラス化率；８１％、ガラス質部分のＳｉＯ２；６５％、ガラス質部分のＡｌ２Ｏ３；２０％
・ガラス質材料Ｅ；ガラス化率；４５％、ガラス質部分のＳｉＯ２；５１％、ガラス質部分のＡｌ２Ｏ３；４３％
・石膏ａ；II型無水石膏（太平洋マテリアル社製、フッ酸無水石膏）
・石膏ｂ；III型無水石膏（ナコード社製、石膏ボード原料からの再生無水石膏）
・石膏ｃ；Ｉ型無水石膏（石膏ａを電気炉内で１２００℃で焼成して作製）
・骨材；ＪＩＳ Ｒ ５２０１ セメントの強さ試験用標準砂（セメント協会・研究所製）
・水；水道水
・分散剤；ポリカルボン酸系高性能減水剤コアフロー（太平洋マテリアル社製）
<Preparation of cement composition and mortar composition>
A sample for testing was prepared by kneading with a hand mixer (manufactured by Toshiba, rotating speed 1000 rpm) for 3 minutes in a constant temperature test room at 20 ° C. at the blending ratio shown in Table 1.
The materials used are shown below.
The addition amount of the dispersant was adjusted to a flow value measured in accordance with JIS R 5201 is 0.99 ± 20 mm.
・ Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement)
-Grain quality material A; vitrification rate;> 95%, SiO 2 in the glassy part; 95% (commercially available silica fume)
-Grain quality material B; vitrification rate; 91%, SiO 2 in the glassy part; 51%, Al 2 O 3 in the glassy part; 47%
-Grain quality material C; vitrification rate; 80%, SiO 2 in the glassy part; 52%, Al 2 O 3 in the glassy part; 43%
-Grain quality material D ; vitrification rate; 81%, SiO 2 in the glassy part; 65%, Al 2 O 3 in the glassy part; 20%
-Grain quality material E; vitrification rate; 45%, SiO 2 in the glassy part; 51%, Al 2 O 3 in the glassy part; 43%
-Gypsum a; Type II anhydrous gypsum (manufactured by Pacific Material Co., Ltd., hydrofluoric acid anhydrous gypsum)
-Gypsum b; Type III anhydrous gypsum (manufactured by Nacord, regenerated anhydrous gypsum from gypsum board raw material)
-Gypsum c; type I anhydrous gypsum (made by firing gypsum a at 1200 ° C in an electric furnace)
-Aggregate: JIS R 5201 Standard sand for cement strength test (manufactured by Cement Association / Research Institute)
・ Water; tap water / dispersant; polycarboxylic acid-based high-performance water reducing agent Core Flow (manufactured by Pacific Materials Co., Ltd.)
Claims (2)
（１）ガラス化率が８０％以上であって、ガラス質部分の化学組成がＳｉＯ２９０質量％以上であるシリケートガラス粉末
（２）ガラス化率が８０％以上であって、ガラス質部分の化学組成がＡｌ２Ｏ３４０〜５０質量％及びＳｉＯ２５０〜６０質量％であるアルミノシリケートガラス粉末 A cement composition containing cement, the following two types of glassy materials, and anhydrous gypsum.
(1) Silicated glass powder having a vitrification rate of 80% or more and a chemical composition of a vitreous portion of SiO 2 90% by mass or more (2) A vitrification rate of 80% or more and a vitreous portion Aluminosilicate glass powder having a chemical composition of Al 2 O 3 40 to 50% by mass and SiO 2 50 to 60% by mass
セメント組成物１００質量部に対して、水が１８〜３２質量部であることを特徴とする超高強度・低収縮モルタル組成物。
Contains the cement composition, dispersant, aggregate and water
An ultra-high strength, low shrinkage mortar composition characterized in that water is 18 to 32 parts by mass with respect to 100 parts by mass of the cement composition.
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