JP2012140295A - Early expansive cement composition - Google Patents
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- JP2012140295A JP2012140295A JP2010294228A JP2010294228A JP2012140295A JP 2012140295 A JP2012140295 A JP 2012140295A JP 2010294228 A JP2010294228 A JP 2010294228A JP 2010294228 A JP2010294228 A JP 2010294228A JP 2012140295 A JP2012140295 A JP 2012140295A
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- 239000000203 mixture Substances 0.000 title claims abstract description 63
- 239000011405 expansive cement Substances 0.000 title claims abstract description 43
- 239000004568 cement Substances 0.000 claims abstract description 56
- 239000000843 powder Substances 0.000 claims abstract description 47
- 229910001579 aluminosilicate mineral Inorganic materials 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 6
- 239000011707 mineral Substances 0.000 claims abstract description 6
- 239000010440 gypsum Substances 0.000 claims description 23
- 229910052602 gypsum Inorganic materials 0.000 claims description 23
- 239000000126 substance Substances 0.000 claims description 18
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 5
- 239000005995 Aluminium silicate Substances 0.000 claims description 4
- 235000012211 aluminium silicate Nutrition 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 58
- 238000001035 drying Methods 0.000 abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 34
- 239000004567 concrete Substances 0.000 description 22
- 239000012615 aggregate Substances 0.000 description 18
- 239000003638 chemical reducing agent Substances 0.000 description 15
- 238000012360 testing method Methods 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 239000011398 Portland cement Substances 0.000 description 7
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001653 ettringite Inorganic materials 0.000 description 3
- -1 halosite Inorganic materials 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004848 polyfunctional curative Substances 0.000 description 2
- 229910021487 silica fume Inorganic materials 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005280 amorphization Methods 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 229910001649 dickite Inorganic materials 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011019 hematite Substances 0.000 description 1
- 229910052595 hematite Inorganic materials 0.000 description 1
- 239000011396 hydraulic cement Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- PSZYNBSKGUBXEH-UHFFFAOYSA-M naphthalene-1-sulfonate Chemical compound C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 PSZYNBSKGUBXEH-UHFFFAOYSA-M 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Abstract
Description
本発明は、初期膨張性セメント組成物に関する。詳しくは、材齢１日における膨張率が大きい初期膨張性セメント組成物に関する。より詳しくは、材齢１日における膨張率が従来のコンクリート用膨張材を用いたセメント組成物よりも大きい初期膨張性セメント組成物に関する。 The present invention relates to an initial expansive cement composition. Specifically, the present invention relates to an initial expansive cement composition having a large expansion rate at a material age of 1 day. More specifically, the present invention relates to an initial expansible cement composition having an expansion rate at a material age of 1 day larger than that of a cement composition using a conventional concrete expansive material.
セメントを含有するモルタルやコンクリート等のセメント組成物では乾燥収縮によるひび割れ防止や形状寸法の変化を防ぐため膨張性の混和材が使用されることが多い（例えば、特許文献１及び特許文献２参照。）。このような膨張性混和材として、コンクリート用膨張材が日本工業規格で規格化され（ＪＩＳ Ａ ６２０２）、この規格に準拠した製品も市販されている。このＪＩＳ Ａ ６２０２において、材齢７日の膨張性（長さ変化率）が０．０２５％（２５０×１０−６）以上と定められている。コンクリート用膨張材を混和したモルタルやコンクリートであっても、型枠取り外し（脱型）後は水分が失われ乾燥により収縮する。圧縮強度が５Ｎ／ｍｍ２以上あれば通常の鉄筋コンクリートでは脱型することができる。温度及び用いるセメント並びにセメント組成物の配合によっては、材齢１日でこの５Ｎ／ｍｍ２以上の圧縮強度となることもある。しかし、市販のコンクリート用膨張材を混和したセメント組成物では、材齢１日では膨張性が不足するために、その後の条件によっては乾燥収縮によるひび割れが発生することがある。 In cement compositions such as mortar and concrete containing cement, an expandable admixture is often used in order to prevent cracking due to drying shrinkage and to prevent changes in shape dimensions (see, for example, Patent Document 1 and Patent Document 2). ). As such an expandable admixture, an expandable material for concrete is standardized by Japanese Industrial Standard (JIS A 6202), and products compliant with this standard are also commercially available. In JIS A 6202, the expansibility (length change rate) on the 7th day of age is defined as 0.025% (250 × 10 −6 ) or more. Even mortar and concrete mixed with concrete expansion material loses moisture after mold removal (demolding) and shrinks by drying. If the compressive strength is 5 N / mm 2 or more, normal reinforced concrete can be removed. Depending on the temperature and the cement used and the composition of the cement composition, the compressive strength of 5 N / mm 2 or more may be obtained in one day of age. However, in a cement composition containing a commercially available concrete expansion material, the expandability is insufficient at the age of 1 day, and cracking due to drying shrinkage may occur depending on the subsequent conditions.
本発明は前記問題の解決、即ち、本発明は、材齢１日における膨張率が大きい初期膨張性セメント組成物を提供することを目的とする。より詳しくは、材齢１日で脱型することができ、材齢１日で脱型する場合であっても、材齢１日における膨張率が大きく乾燥収縮によるひび割れが発生する虞が低い初期膨張性セメント組成物を提供することを目的とする。 An object of the present invention is to provide an initial expansive cement composition that solves the above-mentioned problems, that is, the present invention has a large expansion rate at a material age of 1 day. More specifically, the mold can be demolded at a material age of 1 day, and even when the mold is demolded at a material age of 1 day, the initial coefficient of expansion at a material age of 1 is large and the risk of cracking due to drying shrinkage is low. An object is to provide an expandable cement composition.
本発明者は、前記課題解決のため鋭意検討した結果、セメントと、膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類を特定の割合で含有することにより、上記課題を解決できることを見出し、本発明を完成させた。即ち、本発明は、以下の（１）又は（２）で表す初期膨張性セメント組成物である。
（１）セメントと、セメント１００質量部に対し、膨張性物質４〜１５質量部、非晶質アルミノ珪酸鉱物粉末６〜２０質量部、石膏類１．６〜２０質量部を含有することを特徴とする初期膨張性セメント組成物。
（２）上記非晶質アルミノ珪酸鉱物粉末が、カオリン鉱物を加熱し非晶質化した非晶質アルミノ珪酸鉱物である上記（１）の初期膨張性セメント組成物。
As a result of intensive studies for solving the above problems, the present inventor has found that the above problems can be solved by containing cement and an expansive substance, amorphous aluminosilicate mineral powder and gypsum in a specific ratio, The present invention has been completed. That is, the present invention is an initial expansive cement composition represented by the following (1) or (2).
(1) It is characterized by containing 4 to 15 parts by mass of expansive material, 6 to 20 parts by mass of amorphous aluminosilicate mineral powder, and 1.6 to 20 parts by mass of gypsum with respect to 100 parts by mass of cement. An initial expansive cement composition.
(2) The initial expansive cement composition according to (1), wherein the amorphous aluminosilicate mineral powder is an amorphous aluminosilicate mineral obtained by heating kaolin mineral to make it amorphous.
本発明によれば、材齢１日における膨張率が大きい初期膨張性セメント組成物が得られる。また、本発明によれば、材齢１日の圧縮強度が５Ｎ／ｍｍ２以上となることから材齢１日で脱型することができ、材齢１日で脱型する場合であっても、材齢１日における膨張率が大きく乾燥収縮によるひび割れが発生する虞が低い初期膨張性セメント組成物が得られる。 According to the present invention, an initial expansive cement composition having a large expansion rate at a material age of 1 day can be obtained. Moreover, according to this invention, since the compressive strength of material age 1 day becomes 5 N / mm < 2 > or more, it can demold at material age 1 day, Even if it is a case where it demolds at material age 1 day. Thus, an initial expansive cement composition having a high expansion rate at a material age of 1 day and a low risk of cracking due to drying shrinkage can be obtained.
本発明の初期膨張性セメント組成物に用いるセメントは、水硬性セメントであればよく、例えば普通、早強、超早強、低熱及び中庸熱の各種ポルトランドセメント、エコセメント、並びにこれらのポルトランドセメント又はエコセメントに、フライアッシュ、高炉スラグ、シリカフューム又は石灰石微粉末等を混合した各種混合セメント、太平洋セメント社製「ジェットセメント」（商品名）や住友大阪セメント社製「ジェットセメント」（商品名）等の超速硬セメント、アルミナセメント等が挙げられ、これらの一種又は二種以上を使用することができる。ワーカビリティを損ない難く可使時間が長く確保し易いことから、各種ポルトランドセメント、エコセメント及び各種混合セメントから選ばれる一種又は二種以上を使用することが好ましい。また、材齢１日の強度を高くし易いことから、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント及びエコセメントから選ばれる一種又は二種以上を使用することが更に好ましい。 The cement used in the initial expansive cement composition of the present invention may be a hydraulic cement. For example, various ordinary Portland cements, early cement strength, very early strength, low heat and moderate heat, eco cement, and these Portland cements or Eco-cement mixed with fly ash, blast furnace slag, silica fume or fine powder of limestone, etc., "Jet Cement" (trade name) manufactured by Taiheiyo Cement, "Jet Cement" (trade name) manufactured by Sumitomo Osaka Cement And ultra-high speed cement, alumina cement, and the like, and one or more of these can be used. It is preferable to use one or two or more kinds selected from various Portland cements, eco-cements, and various mixed cements because workability is not easily impaired and the pot life is easy to ensure. Moreover, since it is easy to make the intensity | strength of material age 1 day high, it is still more preferable to use 1 type, or 2 or more types chosen from normal Portland cement, early-strength Portland cement, super early-strength Portland cement, and eco-cement.
本発明の初期膨張性セメント組成物においてセメントの含有率は、骨材の有無及び粒度分布等によって大きく異なる。本発明の初期膨張性セメント組成物が骨材として細骨材のみ含有する初期膨張性モルタルの場合における、好ましいセメントの含有率は、２０〜８０質量％（水を含まない初期膨張性セメント組成物における含有率）とする。２０質量％未満では材齢１日の圧縮強度を確保し難い。８０質量％を超えると、脱型後の乾燥収縮が大きくなり易い。材齢１日の圧縮強度が高く且つ脱型後の乾燥収縮が小さいことから、更に好ましくは２５〜６０質量％とする。また、本発明の初期膨張性セメント組成物が、骨材として細骨材及び粗骨材を含有する初期膨張性コンクリートの場合における、好ましいセメントの含有率は、８〜５０質量％（水を含まない初期膨張性セメント組成物における含有率）とする。８質量％未満では材齢１日の圧縮強度を確保し難い。５０質量％を超えると、脱型後の乾燥収縮が大きくなり易い。材齢１日の圧縮強度が高く且つ脱型後の乾燥収縮が小さいことから、更に好ましくは１０〜３０質量％とする。 In the initial expansive cement composition of the present invention, the cement content varies greatly depending on the presence or absence of aggregates and the particle size distribution. When the initial expandable cement composition of the present invention is an initial expandable mortar containing only fine aggregate as an aggregate, the preferred cement content is 20 to 80% by mass (initial expandable cement composition not containing water) Content rate). If it is less than 20% by mass, it is difficult to ensure the compressive strength of the material one day. If it exceeds 80% by mass, drying shrinkage after demolding tends to increase. More preferably, it is 25-60 mass% since the compressive strength of the material age is high and the drying shrinkage after demolding is small. Moreover, when the initial expansive cement composition of the present invention is an initial expansive concrete containing fine aggregate and coarse aggregate as an aggregate, the preferable cement content is 8 to 50% by mass (including water). Content ratio in the initial expansive cement composition). If it is less than 8% by mass, it is difficult to ensure the compressive strength of one day of age. If it exceeds 50% by mass, drying shrinkage after demolding tends to increase. More preferably, the content is 10 to 30% by mass because the compressive strength at one day of age is high and the drying shrinkage after demolding is small.
本発明の初期膨張性セメント組成物に用いる膨張性物質は、水和生成物の結晶により膨張するものを云い、例えば、エトリンガイトの結晶生成により膨張するエトリンガイト系コンクリート用膨張材，カルシウムサルホアルミネート粉末、並びに水酸化カルシウムの結晶生成により膨張する石灰系コンクリート用膨張材，硬焼生石灰等が挙げられる。本発明に用いる膨張性物質の粉末度は、ＪＩＳ Ｒ ５２０１−１９９７に規定される比表面積試験による測定したブレーン比表面積の値が、２０００〜５０００ｃｍ２／ｇの範囲のものが好ましい。２０００ｃｍ２／ｇ未満では、脱型後に強度増進する割合が低くなる虞があり、５０００ｃｍ２／ｇ以上では膨張性を得るためにより多い量の膨張性物質が必要となる。 The expansive substance used in the initial expansive cement composition of the present invention is an expansive substance that expands due to hydrated product crystals. For example, an expandable material for ettringite-based concrete that expands due to ettringite crystal formation, calcium sulfoaluminate powder In addition, expansion materials for lime-based concrete, hard-fired quicklime, and the like that are expanded by the formation of calcium hydroxide crystals. The fineness of the expansive substance used in the present invention is preferably such that the value of the Blaine specific surface area measured by the specific surface area test specified in JIS R 5201-1997 is in the range of 2000 to 5000 cm 2 / g. If it is less than 2000 cm 2 / g, the rate of strength enhancement after demolding may be low, and if it is 5000 cm 2 / g or more, a larger amount of expansible material is required to obtain expansibility.
本発明の初期膨張性セメント組成物において膨張性物質の含有量は、セメント１００質量部に対し４〜１５質量部とし、好ましくは５〜１０質量部とする。４質量部未満では材齢１日における膨張率が不足する。１５質量部を超えると過膨張によるひび割れが硬化体に発生する虞が高まる。 In the initial expansive cement composition of the present invention, the content of the expansive substance is 4 to 15 parts by mass, preferably 5 to 10 parts by mass with respect to 100 parts by mass of cement. If it is less than 4 parts by mass, the expansion rate at the age of 1 day is insufficient. If it exceeds 15 parts by mass, the risk of cracks due to overexpansion occurring in the cured body increases.
本発明の初期膨張性セメント組成物に用いる非晶質アルミノ珪酸鉱物粉末は、ＳｉＯ２及びＡｌ２Ｏ３を主要化学成分として含有する鉱物のうち非晶質のものである。ここでいう非晶質とは、粉末Ｘ線回折装置による測定で、ピークが見られなくなることをいい、本発明に用いる非晶質アルミノ珪酸鉱物粉末は非晶質の割合が７０質量％以上であればよく、好ましくは９０質量％以上、より好ましくは１００％即ち粉末Ｘ線回折装置による測定でピークが全く見られないものが最も好ましい。非晶質の割合が低いアルミノ珪酸鉱物粉末、即ち結晶質の割合が高いアルミノ珪酸鉱物粉末は、非晶質の割合が高いアルミノ珪酸鉱物粉末に比べて、同じ混和量における強度発現性が悪く、同じ強度を得るためにはより多くのアルミノ珪酸鉱物粉末を必要とする。本発明に用いる非晶質アルミノ珪酸鉱物粉末には、ＳｉＯ２及びＡｌ２Ｏ３以外に、ＴｉＯ２、Ｆｅ２Ｏ３、ＣａＯ、ＭｇＯ、Ｋ２Ｏ、Ｎａ２Ｏ等の微量成分が含まれていても良い。微量成分の合計が１０質量％以下とすることが、硬化体の圧縮強度を高めることから好ましく、ＳｉＯ２及びＡｌ２Ｏ３以外の各微量成分が２．５％以下とすることがより好ましい。本発明に用いる非晶質アルミノ珪酸鉱物粉末は、ＳｉＯ２及びＡｌ２Ｏ３を主要化学成分として含有する結晶質のアルミノ珪酸鉱物を加熱し非晶質化した非晶質アルミノ珪酸鉱物を粉末にすることによって得られる。加熱による非晶質化の前に粉末にしても良い。ここで用いる結晶質のアルミノ珪酸鉱物は、鉱物中に結晶水や水酸基が含まれていても良い。本発明に用いる非晶質アルミノ珪酸鉱物粉末としては、カオリナイト、ハロサイト、ディッカイト等のカオリン鉱物を加熱し非晶質化した非晶質アルミノ珪酸鉱物の粉末が、化学成分が比較的安定したものを入手し易く、混和したグラウトの物性が比較的安定することから好ましい。アルミノ珪酸鉱物の非晶質化のための加熱としては、外熱キルン、内熱キルン、電気炉等による焼成、及び溶融炉を用いた溶融等が挙げられる。 The amorphous aluminosilicate mineral powder used for the initial expansive cement composition of the present invention is amorphous among the minerals containing SiO 2 and Al 2 O 3 as main chemical components. The term “amorphous” as used herein means that no peak is observed in the measurement by a powder X-ray diffractometer. The amorphous aluminosilicate mineral powder used in the present invention has an amorphous ratio of 70% by mass or more. What is necessary is just 90 mass% or more, More preferably, it is 100%, More preferably, the thing by which a peak is not seen at all by the measurement by a powder X-ray diffractometer is the most preferable. Aluminosilicate mineral powder with a low proportion of amorphous, that is, aluminosilicate mineral powder with a high proportion of crystalline, has poor strength development at the same mixing amount compared to aluminosilicate mineral powder with a high proportion of amorphous, More aluminosilicate mineral powder is required to obtain the same strength. In addition to SiO 2 and Al 2 O 3 , the amorphous aluminosilicate mineral powder used in the present invention contains trace components such as TiO 2 , Fe 2 O 3 , CaO, MgO, K 2 O, and Na 2 O. May be. The total amount of the minor components is preferably 10% by mass or less from the viewpoint of increasing the compressive strength of the cured body, and each minor component other than SiO 2 and Al 2 O 3 is more preferably 2.5% or less. The amorphous aluminosilicate mineral powder used in the present invention is obtained by heating a crystalline aluminosilicate mineral containing SiO 2 and Al 2 O 3 as main chemical components into an amorphous state. It is obtained by doing. It may be made into a powder before amorphization by heating. The crystalline aluminosilicate mineral used here may contain crystal water or a hydroxyl group in the mineral. As the amorphous aluminosilicate mineral powder used in the present invention, the amorphous aluminosilicate mineral powder obtained by heating and amorphizing kaolin mineral such as kaolinite, halosite, dickite, etc. has a relatively stable chemical component. It is preferable because it is easy to obtain and the physical properties of the mixed grout are relatively stable. Examples of the heating for making the aluminosilicate mineral amorphous include firing with an external heat kiln, internal heat kiln, electric furnace, etc., melting with a melting furnace, and the like.
本発明の初期膨張性セメント組成物に用いる非晶質アルミノ珪酸鉱物粉末の粉末度は、ＪＩＳ Ｒ ５２０１−１９９７に規定される比表面積試験による測定したブレーン比表面積の値が、１５０００〜４５０００ｃｍ２／ｇの範囲のものが好ましい。１５０００ｃｍ２／ｇ未満では、材齢１日の膨張率を高めるためにより多くの非晶質アルミノ珪酸鉱物粉末を混和する必要があり、４５０００ｃｍ２／ｇ以上では未硬化のときのコンシステンシーが低下する。より好ましい非晶質アルミノ珪酸鉱物粉末の粉末度は、ブレーン比表面積で２００００〜４００００ｃｍ２／ｇの範囲とする。 The fineness of the amorphous aluminosilicate mineral powder used for the initial expansive cement composition of the present invention is such that the value of the Blaine specific surface area measured by the specific surface area test specified in JIS R 5201-1997 is 15000-45000 cm 2 / Those in the g range are preferred. If it is less than 15000 cm < 2 > / g, it is necessary to mix more amorphous aluminosilicate mineral powder in order to increase the expansion rate of the material day, and if it is 45000 cm < 2 > / g or more, the consistency when uncured is lowered. . The fineness of the more preferable amorphous aluminosilicate mineral powder is in the range of 20000 to 40,000 cm 2 / g in terms of the specific surface area of Blaine.
本発明の初期膨張性セメント組成物において非晶質アルミノ珪酸鉱物粉末の含有量は、セメント１００質量部に対し６〜２０質量部とする。６質量部未満では材齢１日における膨張量が不足する。非晶質アルミノ珪酸鉱物粉末の含有量が２０質量部を超えると、未硬化のときのコンシステンシーが得られ難くなり、コンシステンシーを確保するために水量を増加させると強度が不足する。非晶質アルミノ珪酸鉱物粉末の含有量を、セメント１００質量部に対し７〜１５質量部とすることが、膨張量及びコンシステンシーを得易いことからより好ましく、更に好ましくは８〜１２質量部とする。 In the initial expansive cement composition of the present invention, the content of the amorphous aluminosilicate mineral powder is 6 to 20 parts by mass with respect to 100 parts by mass of the cement. If the amount is less than 6 parts by mass, the amount of expansion at the age of 1 day is insufficient. When the content of the amorphous aluminosilicate mineral powder exceeds 20 parts by mass, it becomes difficult to obtain an uncured consistency, and the strength is insufficient when the amount of water is increased in order to ensure the consistency. It is more preferable that the content of the amorphous aluminosilicate mineral powder is 7 to 15 parts by mass with respect to 100 parts by mass of cement because it is easy to obtain the expansion amount and consistency, and more preferably 8 to 12 parts by mass. To do.
本発明の初期膨張性セメント組成物に用いる石膏類は、無水石膏、二水石膏又は半水石膏を主成分とする粉末であれば特に限定されないが、強度増進作用の観点からＩＩ型無水石膏を主成分とするものが好ましい。石膏類は、セメント中のアルミネート相及び上記非晶質アルミノ珪酸鉱物粉末等と反応しエトリンガイト（３ＣａＯ・Ａｌ２Ｏ３・３ＣａＳＯ４・３２Ｈ２Ｏ）を生成させ、これにより硬化体の膨張率を高くすることができる。使用する石膏類の粉末度はブレーン法による比表面積で３０００ｃｍ２／ｇ以上のものが、反応活性が得られるので好ましい。より好ましくは粉末度が６０００ｃｍ２／ｇ以上の石膏類が良い。粉末度の上限は特に制限されないが、粉末度を高めるコストが嵩む割にはその効果が鈍化することから概ね１５０００ｃｍ２／ｇ程度が適当である。 The gypsum used in the initial expansive cement composition of the present invention is not particularly limited as long as it is a powder mainly composed of anhydrous gypsum, dihydrate gypsum, or hemihydrate gypsum, but from the viewpoint of enhancing the strength, type II anhydrous gypsum is used. What has a main component is preferable. Gypsum reacts with aluminate phases in the cement and the amorphous aluminosilicate mineral powders such as to produce ettringite (3CaO · Al 2 O 3 · 3CaSO 4 · 32H 2 O), the expansion rate of the thereby cured product Can be high. The fineness of the gypsum used is preferably 3000 cm 2 / g or more in terms of the specific surface area according to the Blaine method because reaction activity can be obtained. More preferably, gypsum having a fineness of 6000 cm 2 / g or more is preferable. The upper limit of the fineness is not particularly limited, but about 15000 cm 2 / g is appropriate for the cost of increasing the fineness because the effect is slowed down.
本発明の初期膨張性セメント組成物において石膏類の含有量は、セメント１００質量部に対し、１．６〜２０質量部とする。１．６質量部未満では材齢１日における膨張率が不足する。２０質量部を超えると、コンシステンシーが得られ難くなり、コンシステンシーを確保するために水量を増加させると強度が不足する。材齢１日における膨張率が高く且つコンシステンシーを得易いことから、石膏類の含有量をセメント１００質量部に対し２〜１０質量部とすることが好ましく、２．９〜５質量部とすることが更に好ましい。また、本発明の初期膨張性セメント組成物において石膏類の含有量が、上記非晶質アルミノ珪酸鉱物粉末の含有量１００質量部に対し１０〜２００質量部であると、材齢１日における膨張率が高く且つコンシステンシーを得易いことから好ましく、更に、１５〜４０質量部がより好ましい。 In the initial expandable cement composition of the present invention, the content of gypsum is 1.6 to 20 parts by mass with respect to 100 parts by mass of cement. If it is less than 1.6 parts by mass, the expansion rate at the age of 1 day is insufficient. If it exceeds 20 parts by mass, it will be difficult to obtain consistency, and if the amount of water is increased to ensure consistency, the strength will be insufficient. It is preferable that the content of gypsum is 2 to 10 parts by mass with respect to 100 parts by mass of cement, since the expansion rate at the age of 1 day is high and it is easy to obtain consistency. More preferably. Moreover, in the initial expansive cement composition of the present invention, when the content of gypsum is 10 to 200 parts by mass with respect to 100 parts by mass of the amorphous aluminosilicate mineral powder, the expansion at the age of 1 day It is preferable because the rate is high and it is easy to obtain consistency, and more preferably 15 to 40 parts by mass.
本発明の初期膨張性セメント組成物は、セメント、膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類の合計１００質量部に対し、水を２６〜６０質量部添加する。２６質量部よりも水量が少ないと、混練できない。また、６０質量部を超えると、硬化後の強度が不足する。より高いコンシステンシー及び強度が得られることから、セメント、膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類の合計１００質量部に対し、２８〜５０質量部の水量とする。尚、本発明において使用する水の量は、水溶液やエマルション等の液状の混和材料に含まれる水量も考慮したものとする。 26-60 mass parts of water is added to the initial expansive cement composition of this invention with respect to a total of 100 mass parts of a cement, an expansive substance, an amorphous aluminosilicate mineral powder, and gypsum. If the amount of water is less than 26 parts by mass, kneading cannot be performed. Moreover, when it exceeds 60 mass parts, the intensity | strength after hardening will run short. Since higher consistency and strength are obtained, the amount of water is 28 to 50 parts by mass with respect to 100 parts by mass in total of cement, expansive substance, amorphous aluminosilicate mineral powder, and gypsum. The amount of water used in the present invention also takes into account the amount of water contained in a liquid admixture such as an aqueous solution or emulsion.
本発明の初期膨張性セメント組成物に、更に、減水剤、骨材から選ばれる１種又は２種以上を含有することが好ましい。減水剤をを含有することで、同じコンシステンシーを得るための水量を少なくでき且つ水セメント比を小さくすることができることから、強度をより高めることができ且つ乾燥収縮を抑制できる。また、骨材を含有することで、同じコンシステンシーを得るための水量を少なくできることから、乾燥収縮を抑制できる。また、本発明で用いる減水剤としては、特に限定されず、例えば、ポリカルボン酸塩系減水剤、ナフタレンスルホン酸塩系減水剤、メラミンスルホン酸塩系減水剤及びリグニンスルホン酸塩系減水剤が挙げられ、これらの１種又は２種以上を用いることができる。用いる減水剤としては、高性能減水剤又は高性能ＡＥ減水剤を用いると、同じコンシステンシーを得るための水量をより少なくできることから好ましい。ポリカルボン酸塩系高性能減水剤又はポリカルボン酸塩系高性能ＡＥ減水剤が、少量の含有でコンシステンシーの保持時間を長くできることから特に好ましい。本発明の初期膨張性セメント組成物における減水剤の含有量は、セメント、膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類の合計１００質量部に対し、０．０１〜３質量％とすることが好ましい。 The initial expansive cement composition of the present invention preferably further contains one or more selected from a water reducing agent and an aggregate. By containing a water reducing agent, the amount of water for obtaining the same consistency can be reduced and the water cement ratio can be reduced, so that the strength can be further increased and drying shrinkage can be suppressed. Moreover, since the amount of water for obtaining the same consistency can be reduced by containing aggregate, drying shrinkage can be suppressed. Further, the water reducing agent used in the present invention is not particularly limited, and examples thereof include polycarboxylate-based water reducing agents, naphthalene sulfonate-based water reducing agents, melamine sulfonate-based water reducing agents, and lignin sulfonate-based water reducing agents. 1 type or 2 types or more can be used. As the water reducing agent to be used, it is preferable to use a high performance water reducing agent or a high performance AE water reducing agent because the amount of water for obtaining the same consistency can be reduced. A polycarboxylate-based high-performance water reducing agent or a polycarboxylate-based high-performance AE water reducing agent is particularly preferable because it can increase the retention time of the consistency when contained in a small amount. The content of the water reducing agent in the initial expansive cement composition of the present invention is 0.01 to 3% by mass with respect to 100 parts by mass in total of cement, expansive substance, amorphous aluminosilicate mineral powder, and gypsum. It is preferable.
また、本発明の初期膨張性セメント組成物で用いる骨材としては、特に限定されず、例えば、川砂、陸砂、海砂、砕砂、珪砂、川砂利、陸砂利、砕石、人工骨材、スラグ骨材などを用いることができる。本発明の初期膨張性セメント組成物における骨材の含有量は、初期膨張性セメント組成物がコンクリートの場合はセメント、膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類の合計容積の２〜１５倍の容積とすることが好ましい。また、初期膨張性セメント組成物がモルタルの場合の骨材の含有量は、セメント、膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類の合計容積の０．５〜６倍の容積とすることが好ましい。 Further, the aggregate used in the initial expansive cement composition of the present invention is not particularly limited. For example, river sand, land sand, sea sand, crushed sand, quartz sand, river gravel, land gravel, crushed stone, artificial aggregate, slag Aggregates can be used. The aggregate content in the initial expansive cement composition of the present invention is 2 to 2 of the total volume of cement, expansive substance, amorphous aluminosilicate mineral powder and gypsum when the initial expansive cement composition is concrete. The volume is preferably 15 times. The aggregate content when the initial expansive cement composition is mortar is 0.5 to 6 times the total volume of cement, expansive substance, amorphous aluminosilicate mineral powder, and gypsum. It is preferable.
本発明の初期膨張性セメント組成物には、セメント、膨張性混和材、非晶質アルミノ珪酸鉱物粉末及び石膏類、骨材及び減水剤以外に、他の混和材料から選ばれる一種又は二種以上を本発明の効果を実質損なわない範囲で併用することができる。この混和材料としては、例えばセメント用ポリマー、防水材、防錆剤、収縮低減剤、増粘剤、保水剤、顔料、繊維、撥水剤、白華防止剤、急結剤（材）、急硬剤（材）、凝結遅延剤、消泡剤、発泡剤、高炉スラグ微粉末、石粉、シリカフューム、火山灰、空気連行剤、表面硬化剤等が挙げられる。また、本発明で使用される混和材料は、粉末状でも水溶液状でも使用可能である。 The initial expansive cement composition of the present invention includes one or more selected from other admixtures, in addition to cement, expansive admixture, amorphous aluminosilicate mineral powder and gypsum, aggregate and water reducing agent. Can be used in combination as long as the effects of the present invention are not substantially impaired. This admixture includes, for example, cement polymers, waterproofing materials, rust preventives, shrinkage reducing agents, thickeners, water retention agents, pigments, fibers, water repellents, whitening prevention agents, quick setting agents (materials), Hardener (material), setting retarder, antifoaming agent, foaming agent, blast furnace slag fine powder, stone powder, silica fume, volcanic ash, air entraining agent, surface hardener, and the like. The admixture used in the present invention can be used in the form of powder or aqueous solution.
本発明の初期膨張性セメント組成物は、Ｖ型混合機や可傾式コンクリートミキサ等の重力式ミキサ、ヘンシェル式ミキサ、リボンミキサ、パン型コンクリートミキサ、パグミル型コンクリートミキサ、重力式コンクリートミキサ、グラウトミキサ、ハンドミキサ、左官ミキサ等のミキサにより、所定量の上記各材料を混合することで製造する方が、各材料の偏在が抑えられることから好ましい。このとき用いるミキサは、連続式ミキサでもバッチ式ミキサでも良い。各材料のミキサ内への投入順序は特に限定されない。一種ずつ添加してもよく、一部又は全部を同時に添加してもよい。また、袋やポリエチレン製容器等の容器に各材料を計り取り投入する方法により、本発明の初期膨張性セメント組成物を製造することもできる。また、予め使用する材料を２以上に分け、その分けた材料の一部又は全部をそれぞれ予め混合し、混合したものと残りの材料をミキサ等を用いて混合することで、本発明の初期膨張性セメント組成物を製造することもできる。本発明の初期膨張性セメント組成物に使用する材料のうち、膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類、或いはこれらと更に他の混和材料を予めミキサで混合することで混和材料を製造し、この作製した混和材料と他の材料の各所定量をミキサに投入し混合することで本発明の初期膨張性セメント組成物を製造すると、各材料の計量の手間が省くことができることから好ましい。この膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類を含む混和材料を製造する際には、膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類の各材料が上記の量とすることができる割合で混合する。 The initial expansive cement composition of the present invention comprises a gravitational mixer such as a V-type mixer or a tiltable concrete mixer, a Henschel mixer, a ribbon mixer, a pan concrete mixer, a pug mill concrete mixer, a gravity concrete mixer, and a grout. Manufacturing by mixing a predetermined amount of each of the above materials with a mixer such as a mixer, hand mixer, plastering mixer or the like is preferable because uneven distribution of each material can be suppressed. The mixer used at this time may be a continuous mixer or a batch mixer. The order in which each material is charged into the mixer is not particularly limited. One by one may be added, or part or all may be added simultaneously. Moreover, the initial expansible cement composition of this invention can also be manufactured by the method of measuring and throwing each material into containers, such as a bag and a container made from polyethylene. In addition, the initial expansion of the present invention can be achieved by dividing the material to be used in advance into two or more, mixing a part or all of the divided material in advance, and mixing the mixed material and the remaining material using a mixer or the like. It is also possible to produce a conductive cement composition. Of the materials used for the initial expansive cement composition of the present invention, the expansive substance, the amorphous aluminosilicate mineral powder and the gypsum, or these and other admixtures are mixed in advance with a mixer to obtain the admixture. It is preferable to manufacture the initial expansive cement composition of the present invention by manufacturing and mixing the prepared admixture and each of the other materials with a predetermined amount into a mixer, since the labor of weighing each material can be saved. . When producing an admixture containing the expansive substance, amorphous aluminosilicate mineral powder and gypsum, the amount of the expansive substance, amorphous aluminosilicate mineral powder and gypsum should be the above amounts. Mix in a proportion that can.
また、本発明の初期膨張性セメント組成物に含まれる各材料が全て含水率が１質量％未満の場合は、施工現場で複雑な計量操作等を必要とせずに所定量の水を計量し混練するだけですぐに使用できるように、本発明の初期膨張性セメント組成物の配合成分のすべてが予め混合され粉末状である所謂「プレミックス製品」（但し、本発明の初期膨張性セメント組成物がコンクリートの場合は粉末の中に粗骨材が混合された状態のもの）とすることもできる。本発明の初期膨張性セメント組成物がこの「プレミックス製品」の場合は、使用する混和材料は粉末状又は顆粒状のものを使用し、且つ使用する骨材は乾燥させたものを使用することが好ましい。 Moreover, when all the materials contained in the initial expansive cement composition of the present invention have a moisture content of less than 1% by mass, a predetermined amount of water is measured and kneaded without requiring a complicated measuring operation at the construction site. The so-called “premix product” in which all the components of the initial expansive cement composition of the present invention are premixed and powdered (provided that the initial expansive cement composition of the present invention is used) In the case of concrete, it may be in a state where coarse aggregate is mixed in powder). When the initial expansive cement composition of the present invention is this “premix product”, the admixture to be used should be powdered or granular, and the aggregate to be used should be dried. Is preferred.
［実施例１］
表１に示す配合割合で膨張性物質、非晶質アルミノ珪酸鉱物粉末及び石膏類を混合し膨張性混和材料（略号：ＥＸ１〜ＥＸ５）を作製した。この膨張性混和材料と、セメント、細骨材及び水をホバート社製ミキサ（Ｎ−５０）を用いて混合することで膨張性セメント組成物を作製した。また、膨張性混和材料として市販のコンクリート用膨張材を用い、同様に膨張性セメント組成物を作製した。膨張性セメント組成物の作製は、何れも２０±３℃、湿度８０％以上の恒温室内で行った。使用した材料を以下に示した。水を除く使用材料の含水率は何れも１質量％未満であった。
＜使用材料＞
アルミノ珪酸鉱物粉末：市販品（ＢＡＳＦジャパン社製焼成カオリン、商品名「メタマックス」、粉末Ｘ線回折装置による測定でピークが全く見られない（非晶質）。ＳｉＯ２５３．０質量％及びＡｌ２Ｏ３４３．８質量％含有。ブレーン比表面積の値が３４０００ｃｍ２／ｇ）
石膏類：ＩＩ型無水石膏（ブレーン比表面積７０００ｇ／ｃｍ２）
膨張性物質：市販の生石灰、珪石、石膏及びヘマタイトを混合した後最高温度１４５０℃でロータリーキルンを用いて焼成することでクリンカ（遊離生石灰量は６０％）を作製した。得られたクリンカを粉砕し、ブレーン比表面積の値が、３０００ｃｍ２／ｇの粉末としたものを用いた。
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）
コンクリート用膨張材：市販品（太平洋マテリアル社製、商品名「太平洋ハイパーエクスパン（構造用）」）
細骨材：珪砂（ＪＩＳ Ｒ ５２０１：１９９７附属書２「セメントの試験方法−強さの測定」５．１．３に規定される標準砂）
水：山陽小野田市上水
[Example 1]
Intumescent materials, amorphous aluminosilicate mineral powder and gypsum were mixed at the blending ratios shown in Table 1 to prepare intumescent admixtures (abbreviations: EX1 to EX5). This expandable admixture was mixed with cement, fine aggregate and water using a mixer (N-50) manufactured by Hobart to prepare an expandable cement composition. Moreover, a commercially available expandable material for concrete was used as the expandable admixture, and an expandable cement composition was similarly prepared. The production of the expansive cement composition was carried out in a constant temperature room at 20 ± 3 ° C. and a humidity of 80% or more. The materials used are shown below. The moisture content of the materials used excluding water was less than 1% by mass.
<Materials used>
Aluminosilicate mineral powder: commercial product (baked kaolin manufactured by BASF Japan Ltd., trade name “Metamax”, no peak is observed by measurement with a powder X-ray diffractometer (amorphous). SiO 2 53.0% by mass and al 2 O 3 43.8 mass% content. the value of the Blaine specific surface area of 34000cm 2 / g)
Gypsum: Type II anhydrous gypsum (Brain specific surface area 7000 g / cm 2 )
Expandable substance: Commercially available quicklime, quartzite, gypsum and hematite were mixed and then fired using a rotary kiln at a maximum temperature of 1450 ° C. to produce a clinker (the amount of free quicklime was 60%). The obtained clinker was pulverized and used as a powder having a Blaine specific surface area value of 3000 cm 2 / g.
Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement)
Concrete expansion material: Commercially available (manufactured by Taiheiyo Materials Co., Ltd., trade name “Pacific Hyperexpan (for structure)”)
Fine aggregate: Silica sand (Standard sand specified in JIS R 5201: 1997 Annex 2 “Testing method of cement-Measurement of strength” 5.1.3)
Water: Sanyo Onoda City Water
作製した膨張性セメント組成物の品質試験として、以下に示す通り、膨張性試験及び圧縮強度試験を行った。これらの結果を表２に示した。膨張性試験の結果は、市販のコンクリート用膨張材の材齢７日の長さ変化率を１００％としたときの相対値（％表示）で示した。
＜品質試験方法＞
・膨張性試験
ＪＩＳ Ａ ６２０２：１９９７「コンクリート用膨張材」附属書１「膨張材のモルタルによる膨張性試験方法」に準拠して行い、材齢１日及び７日の長さ変化率を求めた。
・圧縮強度試験
土木学会基準ＪＳＣＥ−Ｇ ５０５−１９９９「円柱供試体を用いたモルタルまたはセメントペーストの圧縮強度試験方法」に準じ、材齢１日の圧縮強度を測定した。このとき供試体は、圧縮強度試験の直前で脱型した。
。
As a quality test of the produced expandable cement composition, an expandability test and a compressive strength test were performed as shown below. These results are shown in Table 2. The result of the expansibility test was expressed as a relative value (% display) when the rate of change in length of a commercially available expansion material for concrete at 7 days of age was 100%.
<Quality test method>
・ Expandability test JIS A 6202: 1997 “Expandable material for concrete” Annex 1 “Expansion test method using mortar of expandable material” was used to determine the rate of change in length of materials 1 day and 7 days old. .
-Compressive strength test According to the Japan Society of Civil Engineers standard JSCE-G 505-1999 "Compressive strength test method of mortar or cement paste using a cylindrical specimen", the compressive strength at 1 day of age was measured. At this time, the specimen was demolded immediately before the compressive strength test.
.
本発明の実施例に当たる膨張性セメント組成物（配合Ｎｏ．３〜５）は、何れも材齢１日の長さ変化率が市販のコンクリート用膨張材の材齢７日の長さ変化率の７０％以上あり、初期に充分膨張していた。また、本発明の実施例に当たる膨張性セメント組成物（配合Ｎｏ．３〜５）並びに市販のコンクリート用膨張材を用いた膨張性セメント組成物（配合Ｎｏ．６）は、何れも、材齢７日の長さ変化率（膨張性）が２５０×１０−６以上で、ＪＩＳ Ａ ６２０２の材齢７日における膨張性の規格を満たしており、過膨張によるひび割れは見られなかった。また、本発明の実施例に当たる膨張性セメント組成物は、何れも材齢１日の圧縮強度が５Ｎ／ｍｍ２以上あり、材齢１日で脱型できる強度を示していた。 In the expansive cement compositions (formulation Nos. 3 to 5) corresponding to the examples of the present invention, the rate of change in length of one day of material is that of the rate of change in length of 7 days of commercial expandable material for concrete. It was 70% or more and was sufficiently expanded in the initial stage. Moreover, the expansive cement composition (mixing No. 3-5) which corresponds to the Example of this invention, and the expansive cement composition (mixing No. 6) using the commercially available expansion | swelling material for concrete are all ages 7 The rate of change in day length (expandability) was 250 × 10 −6 or more, which satisfied the expandability standard of JIS A 6202 at the age of 7 days, and no cracks due to overexpansion were observed. In addition, the expansive cement compositions corresponding to the examples of the present invention all have a compressive strength of 5 N / mm 2 or more per day of the material age, and showed a strength capable of demolding at the material age of 1 day.
本発明によれば、材齢１日で脱型できるので、工期をより短くすることができる。本発明は、膨張性セメント組成物を用いるコンクリート工事、モルタルを使用する工事等に好適に用いることができる。 According to the present invention, since the mold can be removed from the material at one day, the construction period can be further shortened. The present invention can be suitably used for concrete work using an expandable cement composition, work using a mortar, and the like.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006248828A (en) * | 2005-03-09 | 2006-09-21 | Taiheiyo Material Kk | Admixture for high strength mortar/concrete, and mortar/concrete composition |
| JP2007161507A (en) * | 2005-12-12 | 2007-06-28 | Taiheiyo Material Kk | Highly durable cross-section repairing material |
| JP2009084092A (en) * | 2007-09-28 | 2009-04-23 | Taiheiyo Material Kk | Mortar-based restoring material |
| JP2009132557A (en) * | 2007-11-30 | 2009-06-18 | Taiheiyo Material Kk | Admixture for polymer cement grout |
| JP2010150084A (en) * | 2008-12-25 | 2010-07-08 | Taiheiyo Materials Corp | Expansive additive composition for cement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007161507A (en) * | 2005-12-12 | 2007-06-28 | Taiheiyo Material Kk | Highly durable cross-section repairing material |
| JP2009084092A (en) * | 2007-09-28 | 2009-04-23 | Taiheiyo Material Kk | Mortar-based restoring material |
| JP2009132557A (en) * | 2007-11-30 | 2009-06-18 | Taiheiyo Material Kk | Admixture for polymer cement grout |
| JP2010150084A (en) * | 2008-12-25 | 2010-07-08 | Taiheiyo Materials Corp | Expansive additive composition for cement |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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