JP2001226160A - Ultrahigh strength cement hardened body - Google Patents

Ultrahigh strength cement hardened body

Info

Publication number
JP2001226160A
JP2001226160A JP2000040232A JP2000040232A JP2001226160A JP 2001226160 A JP2001226160 A JP 2001226160A JP 2000040232 A JP2000040232 A JP 2000040232A JP 2000040232 A JP2000040232 A JP 2000040232A JP 2001226160 A JP2001226160 A JP 2001226160A
Authority
JP
Japan
Prior art keywords
cement
strength
ultra
hardened
fibers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000040232A
Other languages
Japanese (ja)
Inventor
Kazuo Yamada
一夫 山田
Original Assignee
Taiheiyo Cement Corp
太平洋セメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Taiheiyo Cement Corp, 太平洋セメント株式会社 filed Critical Taiheiyo Cement Corp
Priority to JP2000040232A priority Critical patent/JP2001226160A/en
Publication of JP2001226160A publication Critical patent/JP2001226160A/en
Pending legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/0048Fibrous materials
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • C04B2111/343Crack resistant materials

Abstract

PROBLEM TO BE SOLVED: To provide a cement hardened body having sufficient cracking resistance and also ultrahigh strength. SOLUTION: This cement hardened body is formed form a mix containing at least cement, a pozzolanic fine powder, aggregate having <=2 mm grain size, whiskers, water and a water reducing agent.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、高いひび割れ抵抗
性、とりわけ曲げ応力によって発生するひび割れに対す
る高い抵抗性を備えた超高強度セメント硬化体に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-high-strength hardened cement body having high crack resistance, especially high resistance to cracks caused by bending stress.

【0002】[0002]

【従来技術とその問題点】一般に、超高強度セメント硬
化体や超高強度コンクリートと称されているものは、概
ね100MPaを超える圧縮強度を有し、その配合構成
は、通常のセメント硬化体やコンクリートと比べ、骨材
径を最大数mm以下に制限し、水セメント比をかなり低
く抑え、水セメント比の低下を減水剤の使用で補い、ま
た特に曲げ強度を高めるものでは各種の繊維が配合され
ることが多い。
2. Description of the Related Art In general, what is called an ultra-high-strength hardened cement or an ultra-high-strength concrete has a compressive strength generally exceeding 100 MPa. Compared with concrete, the aggregate diameter is limited to a few mm or less, the water-cement ratio is kept fairly low, and the decrease in water-cement ratio is compensated for by using a water reducing agent. Often done.

【0003】圧縮強度や曲げ強度が特に高い値を有する
超高強度セメント硬化体であっても、ひび割れに対する
抵抗性、特に微細ひび割れ発生に対する抵抗性は必ずし
も高くはならない。これは、脆性材料のひび割れ発生の
原因が、主に一定の曲げ荷重の連続載荷によるものであ
り、斯かる荷重が正負繰り返されると微少ひび割れはよ
り大きなひび割れに急速に進展し、材料の破壊に繋が
る。一方で繊維を大量に含有させると、ひび割れの進展
・拡大阻止が図れるものの、特に圧縮強度の低下を招き
易く、超高強度の特性を喪失することになる。
[0003] Even an ultra-high-strength cement hardened body having particularly high values of compressive strength and bending strength does not necessarily have high resistance to cracks, especially resistance to the occurrence of fine cracks. This is due to the fact that the brittle material is cracked mainly due to continuous loading of a constant bending load.If such a load is repeated positively and negatively, the microcracks rapidly progress to larger cracks, and the material breaks. Connect. On the other hand, when a large amount of fibers is contained, the growth and prevention of cracks can be prevented, but the compression strength is particularly liable to decrease, and the properties of ultra-high strength are lost.

【0004】[0004]

【発明が解決しようとする課題】本発明は前記問題点の
解決を行うものであって、ひび割れに対し十分な抵抗性
を有し、且つ超高強度であるセメント硬化体を提供する
ことを目的とする。
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a cement hardened material having a sufficient resistance to cracks and an ultra-high strength. And

【0005】[0005]

【課題を解決するための手段】本発明者は、前記課題解
決のため鋭意検討した結果、セメント硬化体を構成する
水和成分硬化相(マトリックス相)自体の靱性を高める
ことで、初期ひび割れ発生に対する著しく高い抵抗力を
硬化体全体に付与させることができること。この靱性を
大幅に向上させるには特に非金属系の無機材質よりなる
ウィスカーの配合が強度低下させることも殆どなく優れ
た効果を奏したこと、等の知見を得、該ウィスカーを含
む特定の配合物からなる硬化体が、十分なひび割れ抵抗
性と従来の超高強度セメント硬化体に匹敵する強度特性
を有するものとなったことから、本発明を完成させた。
Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, by increasing the toughness of the hydrated component hardening phase (matrix phase) itself constituting the hardened cement, the initial cracks were formed. That the entire cured body can be provided with extremely high resistance to In order to greatly improve this toughness, it was found that the composition of whiskers made of a nonmetallic inorganic material showed an excellent effect with almost no reduction in strength, and that a specific composition containing the whiskers was obtained. The present invention has been completed because the cured product made of the product has sufficient crack resistance and strength characteristics comparable to those of the conventional ultra-high-strength cement cured product.

【0006】即ち、本発明は、以下の(1)〜(8)で
表される超高強度セメント硬化体である。(1)少なく
とも、セメント、ポゾラン質微粉末、粒径2mm以下の
骨材、ウィスカー、水、及び減水剤を含む配合物からな
ることを特徴とする超高強度セメント硬化体。(2)配
合物が、金属繊維、有機繊維、炭素繊維の何れか1種又
は2種以上を含むことを特徴とする前記(1)の超高強
度セメント硬化体。(3)金属繊維が、径0.01〜
1.0mm、長さ2〜30mmの鋼繊維である前記
(2)の超高強度セメント硬化体。(4)有機繊維が、
径0.005〜1.0mm、長さ2〜30mmのビニロ
ン繊維、ポリプロピレン繊維、ポリエチレン繊維、アラ
ミド繊維から選ばれる一種以上の繊維である前記(2)
の超高強度セメント硬化体。(5)炭素繊維が、径0.
005〜1.0mm、長さ2〜30mmである前記
(2)の超高強度セメント硬化体。(6)配合物に、平
均粒径3〜20μmの無機粉末を含む前記(1)〜
(5)の何れかの超高強度セメント硬化体。(7)配合
物に、平均粒径1mm以下の針状粒子及び/又は板状粒
子を含む前記(1)〜(6)の何れかの超高強度セメン
ト硬化体。(8)ウィスカーが、径1〜20μm、アス
ペクト比3〜50のセラミックスウィスカー又は炭素ウ
ィスカーである前記(1)〜(7)の何れかの超高強度
セメント硬化体。
That is, the present invention is an ultra-high-strength cement hardened product represented by the following (1) to (8). (1) An ultra-high-strength hardened cement material comprising at least a compound containing cement, pozzolanic fine powder, aggregate having a particle size of 2 mm or less, whiskers, water, and a water reducing agent. (2) The ultra-high-strength hardened cement according to (1), wherein the blend contains one or more of metal fibers, organic fibers, and carbon fibers. (3) The metal fiber has a diameter of 0.01 to
The ultra-high-strength cement hardened product of (2), which is a steel fiber having a length of 1.0 mm and a length of 2 to 30 mm. (4) The organic fiber is
(2) which is one or more fibers selected from vinylon fiber, polypropylene fiber, polyethylene fiber, and aramid fiber having a diameter of 0.005 to 1.0 mm and a length of 2 to 30 mm.
Ultra high strength cement hardened body. (5) The carbon fiber has a diameter of 0.
The ultra-high-strength cement hardened product of (2), which has a length of 005 to 1.0 mm and a length of 2 to 30 mm. (6) The composition according to the above (1) to (3), wherein the composition contains an inorganic powder having an average particle size of 3 to 20 μm.
(5) The ultra-high-strength cement hardened body according to any of (5). (7) The ultra-high-strength cement hardened product according to any one of (1) to (6), wherein the composition contains needle-like particles and / or plate-like particles having an average particle diameter of 1 mm or less. (8) The ultrahigh-strength cement hardened product according to any one of (1) to (7), wherein the whiskers are ceramic whiskers or carbon whiskers having a diameter of 1 to 20 μm and an aspect ratio of 3 to 50.

【0007】[0007]

【発明の実施の形態】本発明に於いて、配合物に必須含
有されるセメントは特に限定されず、何れのセメントで
も良く、例えば、普通ポルトランドセメント、早強ポル
トランドセメント、中庸熱ポルトランドセメント、低熱
ポルトランドセメント等の各種ポルトセンドセメント、
高炉セメント、フライアッシュセメント等の混合セメン
トを挙げることができる。
BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the cement which is essentially contained in the composition is not particularly limited, and any cement may be used. Various Portsend cements such as Portland cement,
Blended cement such as blast furnace cement and fly ash cement can be used.

【0008】また、本発明で、配合物に必須含有される
ポゾラン質微粉末は、シリカフューム、シリカダスト、
フライアッシュ、スラグ、火山灰、シリカゾル、沈降シ
リカ等が挙げられる。一般に、シリカフュームやシリカ
ダストでは、その平均粒径は、1.0μm以下であり、
粉砕により微粉化する必要がないので好適である。比較
的粒径の大きいポゾラン物質では粉砕を行い、平均粒径
1.0μm以下に調整する。
[0008] In the present invention, the pozzolanic fine powder essentially contained in the compound is silica fume, silica dust,
Examples include fly ash, slag, volcanic ash, silica sol, precipitated silica, and the like. Generally, in silica fume and silica dust, the average particle size is 1.0 μm or less,
This is preferable because there is no need to pulverize the powder by pulverization. A pozzolanic substance having a relatively large particle diameter is pulverized to adjust the average particle diameter to 1.0 μm or less.

【0009】ポゾラン質微粉末が配合されることによ
り、そのマイクロフィラー効果及びセメント分散効果に
より硬化体が緻密化し、圧縮強度が向上する。一方、ポ
ゾラン質微粉末の添加量が多くなると単位水量が増大す
るので、ポゾラン質微粉末の添加量はセメント100重
量部に対して5〜50重量部が好ましい。
[0009] By blending the pozzolanic fine powder, the cured product is densified by the microfiller effect and the cement dispersing effect, and the compressive strength is improved. On the other hand, when the amount of the pozzolanic fine powder increases, the unit water amount increases. Therefore, the amount of the pozzolanic fine powder to be added is preferably 5 to 50 parts by weight based on 100 parts by weight of the cement.

【0010】また、配合物には粒径2mm以下の骨材、
好ましくは粒径1.5mm以下の骨材、が必須含有され
る。この場合、骨材の粒径とは85%(重量)累積粒径
であり、従って粒径2mmを超える骨材が多少含まれて
も良い。全骨材量に対する粒径2mm以下の骨材量が少
なくなると、強度が低下するため、粒径2mm以下の骨
材量は、全骨材量の50重量%以上が好ましい。
[0010] In addition, an aggregate having a particle size of 2 mm or less,
Preferably, an aggregate having a particle size of 1.5 mm or less is essential. In this case, the particle size of the aggregate is a cumulative particle size of 85% (weight), and therefore, aggregates having a particle size of more than 2 mm may be included. When the amount of aggregate having a particle size of 2 mm or less with respect to the total aggregate amount decreases, the strength decreases. Therefore, the amount of aggregate having a particle size of 2 mm or less is preferably 50% by weight or more of the total aggregate amount.

【0011】本発明では、川砂、陸砂、海砂、砕砂、珪
砂の何れか1種又は2種以上からなる混合砂が粒径2m
m以下の骨材として使用できる。この骨材の配合量は、
強度や耐久性を高める上で、セメント100重量部に対
して50〜250重量部が好ましく、80〜180重量
部がより好ましい。
[0011] In the present invention, a mixed sand composed of one or more of river sand, land sand, sea sand, crushed sand and silica sand has a particle diameter of 2 m.
m can be used as aggregate. The amount of this aggregate is
In order to enhance the strength and durability, the amount is preferably 50 to 250 parts by weight, more preferably 80 to 180 parts by weight, based on 100 parts by weight of cement.

【0012】また、本発明に於ける配合物は、ウィスカ
ーを必須含有する。ウィスカーは、セメント水和物より
も高弾性率であることが好ましく、マトリックスとの親
和性等から非金属系の無機材質よりなるウィスカーが好
ましい。このようなウィスカーの一例としては、炭素ウ
ィスカーや炭化珪素、窒化珪素、アルミナ、ジルコニア
などのセラミックスウィスカーを挙げることができる。
また、セメント水和組織を靱性面で補強する観点から、
硬化後の該組織が概ね数十μm程度であるため、その組
織範囲内の大きさのウィスカーを使用するのが望まし
く、好ましくは直径が1〜20μmのウィスカー、より
好ましくは直径が1〜10μmのウィスカーとする。ウ
ィスカーは高アスペクト比のものほど高靱化作用が強く
発揮できるが、著しくアスペクト比を高めると配合・混
練などの作業時に折れ易いため、およそ3〜50のアス
ペクト比のものを用いることを推奨する。ウィスカーの
配合量は配合後の流動性とひび割れ抵抗作用を鑑み、セ
メント100体積部に対して2〜40体積部が好まし
く、5〜20体積部がより好ましい。40体積部を超え
るとウィスカーの分散性と配合物の流動性が著しく低下
するので好ましくなく、また、2体積部未満では配合効
果が殆ど発現されず、ひび割れ抵抗性が向上しないので
好ましくない。
[0012] The composition of the present invention contains whiskers as an essential component. The whisker preferably has a higher elastic modulus than the cement hydrate, and is preferably a whisker made of a nonmetallic inorganic material from the viewpoint of affinity with the matrix. Examples of such whiskers include carbon whiskers and ceramic whiskers such as silicon carbide, silicon nitride, alumina, and zirconia.
Also, from the viewpoint of reinforcing the cement hydration structure with toughness,
Since the structure after curing is approximately several tens of μm, it is desirable to use a whisker having a size within the range of the structure, preferably a whisker having a diameter of 1 to 20 μm, more preferably a whisker having a diameter of 1 to 10 μm. Whisker. Whisker with higher aspect ratio can exert stronger toughening effect, but it is recommended to use one with aspect ratio of about 3 to 50, because if the aspect ratio is significantly increased, it will break easily during work such as blending and kneading. . The amount of the whisker is preferably 2 to 40 parts by volume, more preferably 5 to 20 parts by volume, based on 100 parts by volume of the cement, in view of the fluidity and the crack resistance after mixing. If it exceeds 40 parts by volume, the dispersibility of the whiskers and the fluidity of the composition are remarkably reduced, and if it is less than 2 parts by volume, the compounding effect is hardly exhibited, and the crack resistance is not improved.

【0013】また、本発明に於ける配合物は、減水剤を
必須含有する。減水剤は、減水効果の大きい高性能減水
剤又は高性能AE減水剤が好ましく、リグニン系、ナフ
タレンスルホン酸系、メラミン系、ポリカルボン酸系、
ポリエーテル系の何れかの成分系のものを使用すること
ができる。減水剤の添加量は、配合物の流動性や分離抵
抗性、硬化後の強度、更にはコスト等から、セメントに
対して固型分換算で0.5〜4.0重量%が好ましい。
尚、減水剤は粉末状又は液状の何れであっても良い。
[0013] The composition of the present invention contains a water reducing agent. As the water reducing agent, a high performance water reducing agent or a high performance AE water reducing agent having a large water reducing effect is preferable, and lignin, naphthalenesulfonic acid, melamine, polycarboxylic acid,
Any of the polyether-based components can be used. The amount of the water reducing agent to be added is preferably 0.5 to 4.0% by weight in terms of solid content with respect to cement in view of the fluidity and separation resistance of the composition, the strength after curing, and the cost.
The water reducing agent may be in a powder form or a liquid form.

【0014】また、本発明に於いて、必須配合する水の
量は、含水配合物の流動性や分離抵抗性、また硬化後の
強度や性状安定性等からセメント100重量部に対し1
0〜35重量部が好ましく、15〜25重量部がより好
ましい。水の配合量が10重量部未満では流動性が低下
して配合物の混練が困難になり、また35重量部を超え
ると硬化性や強度が低下するので何れも好ましくない。
In the present invention, the amount of water to be indispensable is 1 to 100 parts by weight of cement based on the fluidity and separation resistance of the water-containing composition, and the strength and property stability after curing.
The amount is preferably 0 to 35 parts by weight, more preferably 15 to 25 parts by weight. If the amount of water is less than 10 parts by weight, the fluidity is reduced and it becomes difficult to knead the composition. If the amount is more than 35 parts by weight, the curability and strength are undesirably reduced.

【0015】また、本発明では、硬化体の曲げ強度を高
め、とりわけ靱性を向上させる点から、金属繊維、有機
繊維、炭素繊維の何れか1種以上を含んだ配合物を用い
るのが好ましい。金属繊維は鋼繊維やアモルファス繊維
等が挙げられるが、特に鋼繊維が高強度であって入手し
易く、又コスト的にも比較的安価であることから推奨さ
れる。金属繊維は、直径0.01〜1.0mm、長さ2
〜30mmのものが好ましい。直径0.01mm未満で
は張力によって切断され易くなり、また直径1.0mm
を超えると同一配合量では硬化体に含まれる繊維の数が
激減することになるため、強度や靱性の低下が顕著とな
るので何れも好ましくない。また、繊維長さが30mm
を超えると、混練時にファイバーボールが生じ易くなる
ので、好ましくない。繊維長さが2mm未満ではマトリ
ックスとの付着力が低下するため曲げ強度が低下するの
で好ましくない。金属繊維の配合量は、凝結後の硬化体
体積の4%未満に相当する量が好ましく、より好ましく
は、3.5%未満に相当する量とする。配合量が4%以
上では、流動性が低下し、作業性が低下するので好まし
くない。
In the present invention, it is preferable to use a compound containing at least one of a metal fiber, an organic fiber, and a carbon fiber from the viewpoint of increasing the bending strength of the cured product, and particularly improving the toughness. Examples of the metal fiber include steel fiber and amorphous fiber. Particularly, steel fiber is recommended because it has high strength and is easily available, and the cost is relatively low. The metal fiber has a diameter of 0.01 to 1.0 mm and a length of 2
Those having a thickness of up to 30 mm are preferred. If the diameter is less than 0.01 mm, it is easily cut by tension, and the diameter is 1.0 mm
When the amount exceeds the above range, the number of fibers contained in the cured product is drastically reduced at the same blending amount, and the strength and toughness are remarkably reduced. The fiber length is 30mm
Exceeding the ratio is not preferred because fiber balls tend to be produced during kneading. When the fiber length is less than 2 mm, the adhesive strength to the matrix is reduced, and the bending strength is reduced, which is not preferable. The compounding amount of the metal fiber is preferably an amount corresponding to less than 4% of the volume of the cured product after setting, and more preferably an amount corresponding to less than 3.5%. If the compounding amount is 4% or more, the fluidity is reduced, and the workability is reduced, which is not preferable.

【0016】また、有機繊維は、ビニロン繊維、ポリプ
ロピレン繊維、ポリエチレン繊維、アラミド繊維などを
挙げることができる。有機繊維と炭素繊維の形状寸法
は、直径0.005〜1.0mm、長さ2〜30mmの
ものが好ましい。有機繊維及び/又は炭素繊維の配合量
は、凝結後の硬化体体積の10%未満に相当する量が好
ましく、より好ましくは7%未満に相当する量とする。
配合量が10%以上では繊維分散性が低下し、また配合
物の流動性も乏しくなるので好ましくない。
The organic fibers include vinylon fibers, polypropylene fibers, polyethylene fibers, and aramid fibers. The organic fibers and carbon fibers preferably have a diameter of 0.005 to 1.0 mm and a length of 2 to 30 mm. The amount of the organic fibers and / or carbon fibers is preferably less than 10%, more preferably less than 7%, of the volume of the cured product after coagulation.
If the blending amount is 10% or more, the fiber dispersibility is reduced, and the fluidity of the blend is also poor.

【0017】また、配合物には、硬化体の充填密度や耐
久性を高める観点から、平均粒径3〜20μm、より好
ましくは平均粒径4〜10μmの無機粉末を含むことが
好ましい。無機粉末としては石英粉末がコスト的に安価
であり、所望の効果を十分発現できることなどから特に
推奨される。石英粉末は天然鉱物源とする晶質又は非晶
質の石英の他、シリカを主成分とする無機粉末であれば
限定されない。該粉末の配合量は、セメント100重量
部に対し、50重量部以下が好ましく、20〜35重量
部がより好ましい。配合量が50重量部を超えると配合
物の流動性が低下したり、硬化後の強度が低くなるので
好ましくない。
The compound preferably contains an inorganic powder having an average particle size of 3 to 20 μm, more preferably 4 to 10 μm, from the viewpoint of enhancing the packing density and durability of the cured product. As the inorganic powder, quartz powder is particularly recommended because it is inexpensive and can sufficiently exhibit desired effects. The quartz powder is not limited as long as it is an inorganic powder containing silica as a main component in addition to crystalline or amorphous quartz as a natural mineral source. The compounding amount of the powder is preferably 50 parts by weight or less, more preferably 20 to 35 parts by weight, based on 100 parts by weight of cement. If the amount is more than 50 parts by weight, the fluidity of the compound decreases and the strength after curing decreases, which is not preferable.

【0018】また、本配合物は、硬化後の靱性を高める
ため、平均長軸径が1mm以下の針状及び/又は板状の
粒子を含むことができる。針状粒子としては、ウォラス
トナイト、ボーキサイト、ムライト等の天然若しくは合
成の鉱石類からなるものを挙げることができ、板状粒子
としては、マイカフレーク、タルクフレーク、バーミキ
ュライトフレーク、アルミナフレーク等を挙げることが
できる。針状及び/又は板状の粒子の配合量は、セメン
ト100重量部に対し、最大35重量部とするのが好ま
しく、10〜25重量部がより好ましい。配合量が35
重量部を超えると、配合物の流動性が低下したり、硬化
性が低下することがあるので好ましくない。尚、針状粒
子の形状寸法は、針状度、即ち(長軸径/短軸径)の値
が3以上のものが望ましい。
The present composition may contain needle-like and / or plate-like particles having an average major axis diameter of 1 mm or less in order to increase the toughness after curing. Examples of the acicular particles include those composed of natural or synthetic ores such as wollastonite, bauxite, and mullite, and examples of the plate-like particles include mica flake, talc flake, vermiculite flake, and alumina flake. be able to. The amount of the acicular and / or plate-like particles is preferably at most 35 parts by weight, more preferably 10 to 25 parts by weight, based on 100 parts by weight of cement. 35
Exceeding the weight part is not preferred because the fluidity of the composition may be lowered or the curability may be lowered. The shape and dimensions of the acicular particles are desirably those having an acicularity, that is, a value of (major axis diameter / minor axis diameter) of 3 or more.

【0019】本発明に於ける配合物は、上記成分以外の
他の成分、例えば他の混和剤などを必要に応じて適宜含
むものであっても良い。
The composition according to the present invention may optionally contain other components other than the above-mentioned components, for example, other admixtures.

【0020】本発明の超高強度硬化体を製造する上で、
配合物を構成する各成分の配合順序は特に限定されな
い。一例を挙げれば、各成分を混練機に一括投入して混
練する方法。また、水、減水剤以外の成分を予め乾式混
合(プレミックス)し、次いで該プレミックス物、水及
び減水剤を混練機に投入し混練する方法。但し、粉末状
減水剤使用の場合は減水剤もプレミックスしておく、な
どの方法がある。混練は、一般にコンクリート製造で使
用されている混練機なら何れのものでも用いることがで
き、例えば揺動型ミキサ、パン型ミキサ、二軸練りミキ
サ、傾胴ミキサ等を使用することができる。
In producing the ultra-high strength cured product of the present invention,
The order of blending each component constituting the blend is not particularly limited. One example is a method in which each component is put into a kneading machine at a time and kneaded. A method in which components other than water and water reducing agent are dry-mixed (premix) in advance, and then the premix, water and water reducing agent are charged into a kneading machine and kneaded. However, when a powdery water reducing agent is used, there is a method of premixing the water reducing agent. For kneading, any kneading machine generally used in the production of concrete can be used, and for example, an oscillating mixer, a pan mixer, a biaxial kneading mixer, a tilting mixer, or the like can be used.

【0021】混練物は、概ね3〜4週間常温常圧で養生
を行うことによって超高強度のセメント硬化体となる。
尚、混練物の使用法は特に限定されず、例えば成型品を
作製する場合は所望形状の型枠に流し込むことによって
得ることができ、また、各種構築物や土木用に直接施工
しても良く、更に充填材として使用することもできる。
The kneaded material is cured for approximately 3 to 4 weeks at room temperature and pressure to become an ultra-high strength hardened cement material.
The method of using the kneaded material is not particularly limited. For example, in the case of producing a molded product, it can be obtained by pouring into a mold having a desired shape, or may be directly constructed for various structures and civil engineering. Further, it can be used as a filler.

【0022】[0022]

【実施例】低熱又は普通ポルトランドセメント(太平洋
セメント(株)製)、平均粒径0.7μmのシリカフュ
ーム、珪砂4号と5号の重量比2:1からなる混合砂、
直径0.2mmで長さ15mmの鋼繊維、市販のポリカ
ルボン酸系高性能AE減水剤、平均粒径7μmの天然石
英粉末、長軸径0.3mmで長軸径/短軸径=約4の針
状ウォラストナイト、SiCウィスカー(直径約4μ
m、アスペクト比約5)並びに水から選ばれた材料を、
表1に表す配合量となるよう二軸練りミキサに一括投入
し、混練を行った。
Example: Low heat or ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.), silica fume having an average particle size of 0.7 μm, mixed sand consisting of silica sand No. 4 and 5 in a weight ratio of 2: 1,
Steel fiber with a diameter of 0.2 mm and a length of 15 mm, a commercially available polycarboxylic acid-based high-performance AE water reducing agent, natural quartz powder having an average particle diameter of 7 μm, and a major axis diameter of 0.3 mm and a major axis / minor axis diameter of about 4 Needle wollastonite, SiC whisker (about 4μ in diameter)
m, aspect ratio about 5) and a material selected from water,
The mixture was put into a twin-screw kneading mixer at a time so as to have the compounding amount shown in Table 1, and kneaded.

【0023】[0023]

【表1】 [Table 1]

【0024】混練してなる各配合物からJIS A11
32に準じた方法により圧縮強度試験用供試体及び曲げ
試験用供試体をそれぞれ作製し、JIS A1108の
方法に準じて圧縮強度を、またJIS A1106の方
法に準じて曲げ強度、また曲げひび割れ発生応力を測定
した。各測定結果を表1に併せて表す。
JIS A11 from each kneaded compound
A specimen for compressive strength test and a specimen for bending test were prepared according to the method according to JIS 32, respectively, and the compressive strength according to the method of JIS A1108, the bending strength according to the method of JIS A1106, and the stress generated by bending cracking. Was measured. Each measurement result is shown in Table 1.

【0025】[0025]

【発明の効果】本発明の超高強度セメント硬化体は、格
段に高い靱性と強度を有し、特に曲げひび割れ抵抗性が
著しく高いものとなることから、従来のコンクリート系
材料では困難であった用途、例えば過度の曲げ応力負荷
が加わるような部材用途にも十分使用することができ
る。
The hardened ultra-high strength cement of the present invention has remarkably high toughness and strength, and in particular, has extremely high resistance to bending cracks, which has been difficult with conventional concrete materials. It can be sufficiently used for applications, for example, member applications where an excessive bending stress load is applied.

フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) C04B 16:06 C04B 16:06 G 14:38 14:38 A 14:48 14:48 C 22:06 22:06 A 16:06 16:06 A 24:26) 24:26) E 103:30 103:30 111:20 111:20 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) C04B 16:06 C04B 16:06 G 14:38 14:38 A 14:48 14:48 C 22:06 22:06 A 16:06 16:06 A 24:26) 24:26) E 103: 30 103: 30 111: 20 111: 20

Claims (8)

【特許請求の範囲】[Claims] 【請求項1】 少なくとも、セメント、ポゾラン質微粉
末、粒径2mm以下の骨材、ウィスカー、水及び減水剤
を含む配合物からなることを特徴とする超高強度セメン
ト硬化体。
1. A hardened ultra-high strength cement comprising at least a compound comprising cement, fine pozzolanic powder, aggregate having a particle size of 2 mm or less, whiskers, water and a water reducing agent.
【請求項2】 配合物が、金属繊維、有機繊維、炭素繊
維の何れか1種又は2種以上を含むことを特徴とする超
高強度セメント硬化体。
2. An ultra-high-strength hardened cementitious product, characterized in that the composition contains one or more of metal fibers, organic fibers and carbon fibers.
【請求項3】 金属繊維が、径0.01〜1.0mm、
長さ2〜30mmの鋼繊維である請求項2記載の超高強
度セメント硬化体。
3. The metal fiber has a diameter of 0.01 to 1.0 mm,
The ultra-high strength hardened cement according to claim 2, which is a steel fiber having a length of 2 to 30 mm.
【請求項4】 有機繊維が、径0.005〜1.0m
m、長さ2〜30mmのビニロン繊維、ポリプロピレン
繊維、ポリエチレン繊維、アラミド繊維から選ばれる一
種以上の繊維である請求項2記載の超高強度セメント硬
化体。
4. The organic fiber has a diameter of 0.005 to 1.0 m.
The ultra-high-strength hardened cement body according to claim 2, which is at least one fiber selected from vinylon fibers, polypropylene fibers, polyethylene fibers, and aramid fibers having a length of 2 to 30 mm.
【請求項5】 炭素繊維が、径0.005〜1.0m
m、長さ2〜30mmである請求項2記載の超高強度セ
メント硬化体。
5. The carbon fiber has a diameter of 0.005 to 1.0 m.
3. The ultra-high-strength hardened cement body according to claim 2, wherein the length is 2 to 30 mm.
【請求項6】 配合物に、平均粒径3〜20μmの無機
粉末を含む請求項1〜5の何れか記載の超高強度セメン
ト硬化体。
6. The ultra-high strength hardened cement according to claim 1, wherein the composition contains an inorganic powder having an average particle size of 3 to 20 μm.
【請求項7】 配合物に、平均粒径1mm以下の針状粒
子及び/又は板状粒子を含む請求項1〜6の何れか記載
の超高強度セメント硬化体。
7. The ultra-high-strength cement hardened product according to claim 1, wherein the composition contains needle-like particles and / or plate-like particles having an average particle size of 1 mm or less.
【請求項8】 ウィスカーが、径1〜20μm、アスペ
クト比3〜50のセラミックスウィスカー又は炭素ウィ
スカーである請求項1〜7の何れか記載の超高強度セメ
ント硬化体。
8. The ultra-high-strength cement hardened product according to claim 1, wherein the whisker is a ceramic whisker or a carbon whisker having a diameter of 1 to 20 μm and an aspect ratio of 3 to 50.
JP2000040232A 2000-02-17 2000-02-17 Ultrahigh strength cement hardened body Pending JP2001226160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
JP2001226160A true JP2001226160A (en) 2001-08-21

Family

ID=18563651

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005003054A1 (en) * 2003-07-04 2005-01-13 Kajima Corporation Method for reducing autogeneous shrinkage of super high strength concrete
WO2012019364A1 (en) * 2010-08-13 2012-02-16 北新集团建材股份有限公司 Modified wood fiber-reinforced cement external wall panel and producing method therefor
CN103641415A (en) * 2013-12-16 2014-03-19 中国人民解放军理工大学 High-strength anti-cracking ceramsite concrete and preparation method thereof
KR102129423B1 (en) * 2018-12-28 2020-07-02 더블유피이머티리얼즈코리아(주) Ultra High Performance Concrete Manufacturing Method and Ultra High Performance Concrete Panel Construction Assembly

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005003054A1 (en) * 2003-07-04 2005-01-13 Kajima Corporation Method for reducing autogeneous shrinkage of super high strength concrete
WO2012019364A1 (en) * 2010-08-13 2012-02-16 北新集团建材股份有限公司 Modified wood fiber-reinforced cement external wall panel and producing method therefor
KR101408022B1 (en) 2010-08-13 2014-06-17 베이징 뉴 빌딩 머티리얼스 퍼블릭 리미티드 컴퍼니 Modified wood fiber-reinforced cement external wall panel and producing method therefor
CN103641415A (en) * 2013-12-16 2014-03-19 中国人民解放军理工大学 High-strength anti-cracking ceramsite concrete and preparation method thereof
KR102129423B1 (en) * 2018-12-28 2020-07-02 더블유피이머티리얼즈코리아(주) Ultra High Performance Concrete Manufacturing Method and Ultra High Performance Concrete Panel Construction Assembly

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