JP4617073B2 - Quick hardening material and quick hardening cement composition - Google Patents
Quick hardening material and quick hardening cement composition Download PDFInfo
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- JP4617073B2 JP4617073B2 JP2003290818A JP2003290818A JP4617073B2 JP 4617073 B2 JP4617073 B2 JP 4617073B2 JP 2003290818 A JP2003290818 A JP 2003290818A JP 2003290818 A JP2003290818 A JP 2003290818A JP 4617073 B2 JP4617073 B2 JP 4617073B2
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- cement
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- hardening
- hydrate
- calcium aluminate
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- 239000004568 cement Substances 0.000 title claims description 40
- 239000000463 material Substances 0.000 title claims description 28
- 239000000203 mixture Substances 0.000 title claims description 20
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 28
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 27
- 239000002245 particle Substances 0.000 claims description 14
- 239000011398 Portland cement Substances 0.000 claims description 6
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 6
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 6
- 229910052936 alkali metal sulfate Inorganic materials 0.000 claims description 5
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000004570 mortar (masonry) Substances 0.000 description 16
- 239000004567 concrete Substances 0.000 description 12
- 229910052602 gypsum Inorganic materials 0.000 description 10
- 239000010440 gypsum Substances 0.000 description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 9
- 229940095672 calcium sulfate Drugs 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 239000007921 spray Substances 0.000 description 4
- RGHNJXZEOKUKBD-SQOUGZDYSA-N Gluconic acid Natural products OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- -1 12CaO · 7Al 2 O 3 Chemical compound 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 229910001653 ettringite Inorganic materials 0.000 description 2
- 239000000174 gluconic acid Substances 0.000 description 2
- 235000012208 gluconic acid Nutrition 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical class OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229940095564 anhydrous calcium sulfate Drugs 0.000 description 1
- 239000011400 blast furnace cement Substances 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
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 150000004683 dihydrates Chemical class 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、主にモルタルやコンクリートに急硬性を付与する急硬性材料及び急硬性を有するセメント組成物に関する。 The present invention mainly relates to a rapid hardening material that imparts rapid hardening to mortar and concrete and a cement composition having rapid hardening.
コンクリートやモルタル系建造物の緊急工事では、短時間で硬化させるために急硬成分を含むコンクリートやモルタルが使用されることが多い。急硬成分としては、１２ＣａＯ・７Ａｌ2Ｏ3、１１ＣａＯ・７Ａｌ2Ｏ3・ＣａＦ2、４ＣａＯ・３Ａｌ2Ｏ3・ＳＯ3、３ＣａＯ・Ａｌ2Ｏ3などのカルシウムアルミネートが最も良く知られており、（例えば特許文献１参照。）モルタル・コンクリートの調合時に混和材として加えたり、或いは予めセメントに混合させたものが使用される。 In emergency construction of concrete and mortar-based structures, concrete and mortar containing a rapid hardening component are often used in order to cure in a short time. The sudden hard component, best known calcium aluminate such as 12CaO · 7Al 2 O 3, 11CaO · 7Al 2 O 3 · CaF 2, 4CaO · 3Al 2 O 3 · SO 3, 3CaO · Al 2 O 3 (For example, refer to Patent Document 1) A mortar / concrete that is added as an admixture or mixed in advance with cement is used.
カルシウムアルミネートは、セメントの硬化を促進し、短時間強度の発現性を高める作用がある反面、急速な水和反応性を示すことから水を加えた後の可使時間（施工に適した状態に留まることができる時間）の確保が容易でなく、施工作業上の制約があった。このため、グルコン酸などの凝結遅延剤を併用し、可使時間を長くすることも行われている。（例えば特許文献２参照。）この可使時間は、遅延剤の配合量を増加させるに連れてより長くすることができるが、一方で短時間強度の発現性が低下するため、施工工期のみならず短時間に強度等の機能修復を要求される工事などでは必ずしも適した方策とはなり難かった。また、可使時間を長くする別の方策として、カルシウムアルミネートに石膏を混合し、これに少量の水を含有させた急硬材も知られている。（例えば特許文献３参照。）しかるに、カルシウムアルミネートと石膏の混合物に水を加えると、反応を起こしてエトリンガイトが生成し易くなる。この場合、エトリンガイト相は主に粒子表層に形成され易く、このような状態のカルシウムアルミネートと石膏の混合物を使用すると、急硬成分がセメントに及ぼす硬化促進作用が阻害され、また石膏によるセメントに対する硬化時間調整作用も低下する。セメントに対する硬化促進作用に実質的な支障をきたさない範囲まで水の含有量を少なくすると可使時間が急激に短くなり、十分な可使時間の確保が困難となる。 Calcium aluminate promotes the hardening of cement and enhances the development of strength for a short time, while it exhibits rapid hydration reactivity, so the pot life after adding water (state suitable for construction) It was not easy to secure a sufficient time), and there were restrictions on construction work. For this reason, coagulation delay agents, such as gluconic acid, are used together, and the pot life is also lengthened. (For example, refer to Patent Document 2.) The pot life can be increased as the amount of the retarder is increased, but on the other hand, since the expression of strength is reduced for a short time, only the construction period is required. Therefore, it was not always a suitable measure for constructions that required functional restoration such as strength in a short time. In addition, as another measure for extending the pot life, a quick-hardened material in which gypsum is mixed with calcium aluminate and a small amount of water is contained therein is also known. (For example, refer to Patent Document 3.) However, when water is added to a mixture of calcium aluminate and gypsum, a reaction is caused to easily generate ettringite. In this case, the ettringite phase is easily formed mainly on the particle surface layer. When a mixture of calcium aluminate and gypsum in such a state is used, the hardening-promoting action of the rapid hardening component on the cement is inhibited, and the gypsum cement Curing time adjusting action is also reduced. If the water content is reduced to the extent that does not substantially impair the hardening acceleration effect on cement, the pot life is drastically shortened, and it is difficult to secure a sufficient pot life.
本発明は、モルタルやコンクリートの硬化を促進する急硬性材料であって、長い可使時間の確保が可能で、かつ高い短時間強度発現性を付与できる急硬性材料及び該急硬性材料を含むセメント組成物の提供を課題とする。 The present invention relates to a rapid hardening material that promotes the hardening of mortar and concrete, a fast hardening material capable of ensuring a long pot life and imparting high strength in a short time, and a cement containing the rapid hardening material It is an object to provide a composition.
本発明者らは、前記課題解決のための検討を重ねた結果、水和物を表層を形成させたカルシウムアルミネート粒に、硫酸カルシウムと特定のセメント硬化促進成分を併用することによって、公知のカルシウムアルミネート系急硬材と遜色ない硬化促進作用を有することができると共に、カルシウムアルミネートの初期水和反応活性が抑制されて比較的長い可使時間の確保が容易になり、可使時間経過後は急速に強度発現性が高まったこと等の知見から本発明を完成させた。 As a result of repeated studies for solving the above problems, the inventors of the present invention are known by combining calcium sulfate and a specific cement hardening accelerating component together with calcium aluminate grains having a hydrate formed as a surface layer. It has the same hardening-accelerating action as calcium aluminate-based rapid hardeners, and the initial hydration reaction activity of calcium aluminate is suppressed, making it easier to secure a relatively long pot life. Thereafter, the present invention was completed based on the knowledge that the strength development rapidly increased.
即ち、本発明は、（ａ）水和物で被覆されたカルシウムアルミネート粒子、（ｂ）水和物で被覆されていない硫酸カルシウム及び（ｃ）アルミニウム硫酸塩、アルカリ金属硫酸塩、アルカリ金額硫酸塩、アルカリ金属炭酸塩の群から選択される１種以上を含有してなり、（ｄ）水和物で被覆された硫酸カルシウムを含まない急硬性材料である。また本発明は、ポルトランドセメント又は混合セメントと、前記急硬性材料を含有してなる急硬性セメント組成物である。 That is, the present invention comprises (a) calcium aluminate particles coated with hydrate , (b) calcium sulfate not coated with hydrate, and (c) aluminum sulfate, alkali metal sulfate, alkali amount sulfuric acid salt, Ri Na contain one or more selected from the group of alkali metal carbonates, rapid hardening material containing no coated calcium sulfate (d) hydrate. Further, the present invention is a rapid hardening cement composition comprising Portland cement or mixed cement and the rapid hardening material.
本発明の急硬性材料は、モルタルやコンクリートに優れた急硬作用を及ぼすも、これまで得難かった長い可使時間を確保することができるため、施工作業上の制約が少なく、かつ高い短時間強度発現性を付与できる。また本発明の急硬性セメント組成物は、高い急硬性を有する他、モルタルやコンクリート製造時の可使時間を長く確保でき、また性状安定性に優れ、早期〜長期に渡って高い強度発現性を有する。 The quick-hardening material of the present invention has an excellent quick-hardening effect on mortar and concrete, but can ensure a long pot life that has been difficult to obtain so far, so there are few restrictions on construction work and high short time Strength development can be imparted. In addition, the quick-hardening cement composition of the present invention has high quick-hardness, can ensure a long pot life during mortar and concrete production, has excellent property stability, and exhibits high strength development from early to long-term. Have.
本発明の急硬性材料は、カルシウムアルミネートを急硬成分とするものである。ここで云うカルシウムアルミネートとはＣａＯとＡｌ2Ｏ3を主要化学成分とする化合物、固溶体、ガラス質若しくはこれらの何れか１種以上が混合した物の総称であり、本発明ではその何れかであって、水和活性を有するものなら特に制限されず。例えば、１２ＣａＯ・７Ａｌ2Ｏ3、１１ＣａＯ・７Ａｌ2Ｏ3・ＣａＦ2、４ＣａＯ・３Ａｌ2Ｏ3・ＳＯ3などを挙げることができる他、アルミナセメントであっても良い。本発明の急硬性材料は、このようなカルシウムアルミネートで、その表面が水和物で被覆された粒子を含有したものである。被覆はカルシウムアルミネート粒子のできるだけ全表面が覆われた状態となるのが望ましい。また好ましくは、水和物の被覆量が被覆部を含むカルシウムアルミネート粒子の重量の０．３〜５．０重量％、より好ましくは０．５〜４．０重量％のものとする。被覆量が０．３重量％未満ではカルシウムアルミネートの初期水和活性を抑制する作用が弱くなり、長期の可使時間確保が困難となることがあり、また被覆量が５．０重量％を超えると被覆層厚が増すためカルシウムアルミネート自体の水和反応の遅れが大きくなり、早期強度発現性が低下することがある。 The rapid hardening material of the present invention uses calcium aluminate as a rapid hardening component. Calcium aluminate as used herein is a general term for a compound containing CaO and Al 2 O 3 as main chemical components, a solid solution, a glassy material, or a mixture of at least one of them. There is no particular limitation as long as it has hydration activity. For example, addition and the like 12CaO · 7Al 2 O 3, 11CaO · 7Al 2 O 3 · CaF 2, 4CaO · 3Al 2 O 3 · SO 3, may be alumina cement. The rapid-hardening material of the present invention is such a calcium aluminate containing particles whose surfaces are coated with a hydrate. The coating is preferably such that the entire surface of the calcium aluminate particles is covered as much as possible. Preferably, the hydrate coating amount is 0.3 to 5.0% by weight, more preferably 0.5 to 4.0% by weight, based on the weight of the calcium aluminate particles including the coating part. If the coating amount is less than 0.3% by weight, the action of suppressing the initial hydration activity of calcium aluminate is weakened, and it may be difficult to ensure a long pot life, and the coating amount may be 5.0% by weight. If it exceeds, the coating layer thickness increases, so that the delay of the hydration reaction of the calcium aluminate itself may increase, and the early strength development may decrease.
カルシウムアルミネート粒子を被覆する水和物は特に限定されず、例えばＣａＯ・Ａｌ2Ｏ3・１０Ｈ2Ｏ、２ＣａＯ・Ａｌ2Ｏ3・８Ｈ2Ｏ、３ＣａＯ・Ａｌ2Ｏ3・６Ｈ2Ｏ、３ＣａＯ・Ａｌ2Ｏ3・８Ｈ2Ｏ、４ＣａＯ・Ａｌ2Ｏ3・１３Ｈ2Ｏ、４ＣａＯ・Ａｌ2Ｏ3・１９Ｈ2Ｏ、Ａｌ2Ｏ3・３Ｈ2Ｏ等を挙げることができる。このような水和物をカルシウムアルミネート粒子に被覆する方法は何等限定されない。最も簡単と考えられる被覆層形成方法の一例を示すと、概ね分散させたカルシウムアルミネート粒子に、常温又はそれ以下の温度で、カルシウムアルミネート粒子重量のおよそ０．２〜３．５重量％相当の水を噴霧器で噴霧添加する。噴霧添加中及び噴霧添加直後のカルシウムアルミネート粒子は、混合機等を用いて転動させるのが比較的均一な被覆ができるので望ましい。噴霧水によってカルシウムアルミネート粒子表層部が反応し、水和物からなる被覆層を形成する。噴霧に使用する水の代わりにカルシウムアルミネートと反応し水和物を生成するものであれば他の液体でも使用することができる。 Hydrate covering the calcium aluminate particles is not particularly limited, for example, CaO · Al 2 O 3 · 10H 2 O, 2CaO · Al 2 O 3 · 8H 2 O, 3CaO · Al 2 O 3 · 6H 2 O, 3CaO · Al 2 O 3 · 8H 2 O, may be mentioned 4CaO · Al 2 O 3 · 13H 2 O, 4CaO · Al 2 O 3 · 19H 2 O, the Al 2 O 3 · 3H 2 O or the like. The method of coating such calcium hydrate particles with hydrate is not limited. An example of the coating layer forming method that is considered to be the simplest is that the calcium aluminate particles are generally dispersed and correspond to approximately 0.2 to 3.5% by weight of the calcium aluminate particles at normal temperature or lower. Spray water with a sprayer. Calcium aluminate particles during spray addition and immediately after spray addition are desirable because they can be rolled using a mixer or the like because a relatively uniform coating can be obtained. The surface layer of the calcium aluminate particles reacts with the spray water to form a coating layer made of hydrate. Other liquids can be used as long as they react with calcium aluminate instead of water used for spraying to form hydrates.
本発明の急硬性材料は、前記の水和物で被覆されたカルシウムアルミネート粒子の他に、硫酸カルシウムを含有する。含有する硫酸カルシウムは水和物で被覆されたものではなく、水和物で被覆されていないものを用いる。このような硫酸カルシウムを含有することで水和反応の調整がより行い易くなる他、モルタル・コンクリートの急速な硬化に伴う収縮を抑制し、収縮ひび割れ発生を防ぐことができる。硫酸カルシウムの含有量は、カルシウムアルミネート（被覆部を含む）１００重量部に対し、１０〜３００重量部とする。１０重量部未満では含有効果が殆ど得られず、３００重量部を超えると過度の膨張を生じるので好ましくない。また、硫酸カルシウムとして、無水石膏、半水石膏、二水石膏が使用できる他、化学石膏と称される公知の石膏類も使用可能であるが、中長期での強度発現性に優れることから無水石膏又は半水石膏の使用が好ましく、特にブレーン比表面積７０００ｃｍ2／ｇ以上の無水石膏が最も好ましい。
The rapid-hardening material of the present invention contains calcium sulfate in addition to the calcium aluminate particles coated with the hydrate. The calcium sulfate contained is not coated with a hydrate, but is not coated with a hydrate. Containing such calcium sulfate makes it easier to adjust the hydration reaction, suppresses shrinkage associated with rapid hardening of mortar and concrete, and prevents the occurrence of shrinkage cracks. The content of calcium sulfate is 10 to 300 parts by weight with respect to 100 parts by weight of calcium aluminate (including the coating part). If the amount is less than 10 parts by weight, the inclusion effect is hardly obtained, and if it exceeds 300 parts by weight, excessive expansion occurs, which is not preferable. As calcium sulfate, anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum can be used, as well as known gypsum called chemical gypsum can be used. The use of gypsum or hemihydrate gypsum is preferred, and anhydrous gypsum having a specific surface area of 7000 cm 2 / g or more is most preferred.
本発明の急硬性材料は、前記の水和物で被覆されたカルシウムアルミネート粒子と硫酸カルシウムの他に、アルミニウム硫酸塩、アルカリ金属硫酸塩、アルカリ金属炭酸塩の群から選択される１種以上を含有する。これらは何れもセメントの水和反応促進に寄与し、水和物で被覆されたカルシウムアルミネートによるセメントに対する硬化促進作用の低下を補うものである。好ましくは、凝結性に支障を及ぼすことなく短期強度促進作用も高いアルカリ金属炭酸塩を使用するのが良い。アルミニウム硫酸塩、アルカリ金属硫酸塩、アルカリ金属炭酸塩の群から選択される１種以上の成分の急硬性材料中の含有量は０．１〜１０重量％が好ましい。０．１重量％未満では、セメントに対する硬化促進作用が十分得られないことがある。また１０重量％を超えると長期強度発現性が低下することがある。尚、アルカリ金属硫酸塩及び／又はアルカリ金属炭酸塩を使用する場合のアルカリ金属種は特に限定されないが、例えば−２５℃〜５０℃という広い温度範囲でも安定した促進作用が得られることからリチウムが推奨される。 In addition to the calcium aluminate particles and calcium sulfate coated with the hydrate, the rapid-hardening material of the present invention is one or more selected from the group consisting of aluminum sulfate, alkali metal sulfate, and alkali metal carbonate. Containing. These all contribute to the promotion of the hydration reaction of the cement and compensate for the decrease in the hardening promoting effect on the cement by the calcium aluminate coated with the hydrate. Preferably, an alkali metal carbonate having a high short-term strength promoting effect without affecting the coagulation property may be used. The content of one or more components selected from the group of aluminum sulfate, alkali metal sulfate, and alkali metal carbonate in the rapid hardening material is preferably 0.1 to 10% by weight. If it is less than 0.1% by weight, the hardening accelerating action on cement may not be sufficiently obtained. If it exceeds 10% by weight, the long-term strength development may be lowered. The alkali metal species in the case of using alkali metal sulfate and / or alkali metal carbonate is not particularly limited. For example, since lithium has a stable promoting action even in a wide temperature range of −25 ° C. to 50 ° C., lithium is Recommended.
本発明の急硬性材料は、前記成分以外にも本発明の効果を喪失しない範囲で、他の成分、例えば石灰石微粉、各種スラグ微粉、石炭灰、珪石微粉、石膏以外の膨張成分、粉末状の分散成分等を含むものであっても良い。 The rapid-hardening material of the present invention has other components such as limestone fine powder, various slag fine powders, coal ash, silica stone fine powder, expansive components other than gypsum, and powdery materials, as long as the effects of the present invention are not lost. It may contain a dispersion component or the like.
また本発明の急硬性セメント組成物は、前記急硬性材料とポルトランドセメント、又は前記急硬性材料と混合セメントを含有するものであり、またこれ以外の成分も本発明の効果を喪失しない範囲で適宜含むことができる。ポルトランドセメントは何れのものでも使用でき、また混合セメントも特に限定されるものではなく、例えば高炉セメント、フライアッシュセメント、シリカセメント等を挙げることができる。本急硬性セメント組成物中の急硬性材料とセメントの好適な含有量は、ポルトランドセメント又は混合セメント１００重量部に対し、急硬性材料２０〜２００重量部、より好ましくは３０〜１００重量部とする。急硬性材料２０重量部未満では高い短時間強度発現性が得難くなり、また２００重量部を超えると長期強度発現性が低下することがある。他の含有可能な成分としては、例えばポゾラン反応性物質、減水剤、収縮低減剤、凝結遅延剤、顔料等が挙げられる。特に長期の可使時間を確保する上では、本急硬性セメント組成物に凝結遅延剤を含有させるか、本急硬性セメント組成物と凝結遅延剤を併用することが推奨される。本急硬性セメント組成物は、凝結遅延剤を用いた際に見られる短時間強度発現性の低下を殆ど起こさない。また本発明の急硬性セメント組成物は、モルタル、コンクリート、セメントペースト等を製造する際には概ねセメントと同様に扱うことができ、例えばコンクリートを製造する場合、本急硬性セメント組成物に骨材、更に必要に応じてコンクリート用混和剤などを加え、通常行われているような水セメント重量比の範囲を適用した量の水を加えて混合すれば良い。 The rapid-hardening cement composition of the present invention contains the rapid-hardening material and Portland cement, or the rapid-hardening material and mixed cement, and other components are appropriately selected within a range not losing the effects of the present invention. Can be included. Any Portland cement can be used, and the mixed cement is not particularly limited, and examples thereof include blast furnace cement, fly ash cement, and silica cement. The suitable content of the rapid hardening material and cement in the rapid hardening cement composition is 20 to 200 parts by weight, more preferably 30 to 100 parts by weight with respect to 100 parts by weight of Portland cement or mixed cement. . If it is less than 20 parts by weight of the rapid-hardening material, it is difficult to obtain high short-term strength development. If it exceeds 200 parts by weight, long-term strength development may be reduced. Examples of other components that can be contained include pozzolanic reactive substances, water reducing agents, shrinkage reducing agents, setting retarders, and pigments. In particular, in order to ensure a long pot life, it is recommended that the rapid-hardening cement composition contains a setting retarder or that the rapid-hardening cement composition and the setting retarder are used in combination. This rapid-hardening cement composition hardly causes a reduction in strength development for a short time, which is seen when a setting retarder is used. The rapid-hardening cement composition of the present invention can be handled in the same manner as cement when producing mortar, concrete, cement paste, and the like. For example, when producing concrete, the rapid-hardening cement composition is aggregated with the aggregate. Further, if necessary, an admixture for concrete or the like may be added, and an amount of water applied within the range of water cement weight ratio as is usually performed may be added and mixed.
以下、実施例により本発明を具体的に詳しく説明する。 Hereinafter, the present invention will be described in detail by way of examples.
［急硬性材料の作製］
２０℃の温度下でアルミナセメント（太平洋マテリアル株式会社製）５００００ｇをレーディゲミキサーに入れ、回転しながら２５０ｇの水を噴霧器によって噴霧添加した。噴霧添加後約１０分間はミキサーを回転し、２４時間放置した。この処理を行ったアルミナセメント２５０００ｇに、表１の配合量となるよう、炭酸リチウム、硫酸リチウム、硫酸アルミニウム、無水石膏（何れも市販品）から選定される材料を加え、レーディゲミキサーで混合し、Ａ〜Ｃの急硬性材料（本発明品）を作製した。また、比較のため、アルミナセメント２５０００ｇと無水石膏２５０００ｇを混合したものをレーディゲミキサーに入れ、回転しながら２５０ｇの水を噴霧添加した後、２４時間放置して得た参考品Ｄ、参考品Ｄと同様のものに表１の配合量の炭酸リチウムを加え、乾式混合して得た参考品Ｅ、アルミナセメント２５０００ｇと無水石膏２５０００ｇを何れも水を添加することなくレーディゲミキサーで乾式混合して得た参考品Ｆ及びアルミナセメント２５０００ｇと無水石膏２５０００ｇと炭酸リチウム１２５０ｇを何れも水を添加することなくレーディゲミキサーで乾式混合して得た参考品Ｇも作製した。
[Production of rapid hardening material]
Under a temperature of 20 ° C., 50000 g of alumina cement (manufactured by Taiheiyo Material Co., Ltd.) was put into a Laedige mixer, and 250 g of water was sprayed and added with a sprayer while rotating. The mixer was rotated for about 10 minutes after spraying and left for 24 hours. A material selected from lithium carbonate, lithium sulfate, aluminum sulfate, and anhydrous gypsum (all of which are commercially available) is added to 25,000 g of this treated alumina cement so that the blending amount is as shown in Table 1, and mixed with a Ladige mixer. Then, A to C quick-hardening materials (product of the present invention) were produced. For comparison, a mixture of 25000 g of alumina cement and 25000 g of anhydrous gypsum was placed in a Laedige mixer, sprayed with 250 g of water while rotating, and then allowed to stand for 24 hours. Add Lithium Carbonate in the amount shown in Table 1 to the same as D, and dry mix the reference product E, 25000 g of alumina cement and 25000 g of anhydrous gypsum with a Laedige mixer without adding water. A reference product G obtained by dry-mixing 25000 g of the reference product F and alumina cement 25000 g of anhydrous cement, 25000 g of anhydrous gypsum, and 1250 g of lithium carbonate without adding water was also prepared.
［モルタル試験体の作製］
表２に記す配合となるよう前記Ａ〜Ｇ、普通ポルトランドセメント（太平洋セメント株式会社製）、細骨材（比重２．６９の小倉南区産砕砂と比重２．５９の壱岐郡郷ノ浦沖合砕砂の重量比３：７の混合砕砂）をホバートミキサーで乾式混合し、この混合物に２０℃の温度下で水又は水と有機系凝結遅延剤（クエン酸又はグルコン酸；何れも市販品）を加えて約２分間混練を行った。混練物は型枠に入れ、４×４×１６ｃｍの試験体を作製した。
[Preparation of mortar specimen]
A to G, ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.), fine aggregate (crushed sand from Ogura Minami-ku with a specific gravity of 2.69) and crushed sand off the coast of Noki, Iki-gun with a specific gravity of 2.59 so as to have the composition shown in Table 2. The mixed crushed sand (weight ratio 3: 7) was dry-mixed with a Hobart mixer, and water or water and an organic setting retarder (citric acid or gluconic acid; both commercially available) were added to the mixture at a temperature of 20 ° C. Kneading was performed for about 2 minutes. The kneaded product was put into a mold to prepare a 4 × 4 × 16 cm specimen.
［試験体の特性］
前記各モルタル試験体を、ＪＩＳ Ｒ ５２０１の試験方法に準じた２０℃でのモルタルの凝結試験に供し、凝結始発時間を測定し、これを可使時間の指標にした。またＪＩＳ Ｒ ５２０１の試験方法に準じてモルタル質試験体の材齢２時間、３時間、２４時間、７日及び２８日の圧縮強度を測定した。これらの結果を表３に記す。尚、表中の配合７のモルタルは、水を加えた直後に瞬結したため、圧縮強度の測定は行わなかった。
[Characteristics of specimen]
Each of the mortar specimens was subjected to a mortar setting test at 20 ° C. according to the test method of JIS R 5201, the setting time of setting was measured, and this was used as an index of pot life. Further, according to the test method of JIS R 5201, the compressive strength of the mortar specimen was measured for 2 hours, 3 hours, 24 hours, 7 days and 28 days. These results are shown in Table 3. In addition, since the mortar of the mixing | blending 7 in a table | surface was instantaneously set immediately after adding water, the compression strength was not measured.
表３から、本発明の急硬性材料を使用したモルタルは、何れも長い可使時間を有すると共に、高い短時間強度を示し、更には中長期の強度発現性も高いものであることがわかる。 From Table 3, it can be seen that each of the mortars using the rapid-hardening material of the present invention has a long pot life, exhibits a high short-time strength, and has a high medium-long-term strength development.
本発明の急硬性材料は、とりわけ短時間で施工が完結するような、また短時間で実用的な機能発現を得るための補修や早期構築用としてのモルタル・コンクリートへの使用に適している。 The rapid-hardening material of the present invention is particularly suitable for use in mortar and concrete for completion of construction in a short time and for repair and early construction for obtaining a practical function in a short time.
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| JP2007217261A (en) * | 2006-02-20 | 2007-08-30 | Taiheiyo Material Kk | Quick-hardening hydraulic composition |
| JP6096039B2 (en) * | 2013-04-12 | 2017-03-15 | 太平洋マテリアル株式会社 | Quick set |
| CN105339322B (en) * | 2013-06-20 | 2017-09-05 | 电化株式会社 | The fast hard material of cement, its manufacture method and cement composition |
| JP2019172522A (en) * | 2018-03-29 | 2019-10-10 | 宇部興産建材株式会社 | Cement composition and manufacturing method therefor |
| CN111423193B (en) * | 2020-03-20 | 2023-01-31 | 临海市忠信新型建材有限公司 | Quick-hardening polymer cement waterproof mortar with low water absorption and preparation method thereof |
| JP7558625B2 (en) | 2021-03-16 | 2024-10-01 | 太平洋マテリアル株式会社 | Fast-hardening grout composition and fast-hardening grout |
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| JPS62162506A (en) * | 1985-11-08 | 1987-07-18 | サンド・アクチエンゲゼルシヤフト | Hydraulic binding material and manufacture of cement mixture |
| JPH02167847A (en) * | 1988-09-09 | 1990-06-28 | Nisso Masutaabirudaazu Kk | Production of improved powdery cement composition |
| JP2001233660A (en) * | 2000-02-25 | 2001-08-28 | Denki Kagaku Kogyo Kk | Dry cement concrete, spray material and spraying method using the same |
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| JPS62162506A (en) * | 1985-11-08 | 1987-07-18 | サンド・アクチエンゲゼルシヤフト | Hydraulic binding material and manufacture of cement mixture |
| JPH02167847A (en) * | 1988-09-09 | 1990-06-28 | Nisso Masutaabirudaazu Kk | Production of improved powdery cement composition |
| JP2001233660A (en) * | 2000-02-25 | 2001-08-28 | Denki Kagaku Kogyo Kk | Dry cement concrete, spray material and spraying method using the same |
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