WO2009142029A1 - 重量骨材及び重量コンクリート - Google Patents
重量骨材及び重量コンクリート Download PDFInfo
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- WO2009142029A1 WO2009142029A1 PCT/JP2009/050576 JP2009050576W WO2009142029A1 WO 2009142029 A1 WO2009142029 A1 WO 2009142029A1 JP 2009050576 W JP2009050576 W JP 2009050576W WO 2009142029 A1 WO2009142029 A1 WO 2009142029A1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/0031—Heavy materials, e.g. concrete used as ballast material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00862—Uses not provided for elsewhere in C04B2111/00 for nuclear applications, e.g. ray-absorbing concrete
Definitions
- the present invention relates to heavy aggregate including heavy fine aggregate and heavy concrete using the same.
- a heavy concrete is a concrete having a large unit volume mass by using a heavy aggregate whose specific gravity is larger than that used in general concrete, and is a radiation shielding concrete, a wave-dissipating block, a concrete for a seawall, or It is used as concrete for filling counterweights in construction machinery or industrial machinery.
- the slump value is increased by increasing the unit water volume in concrete, but if the unit water volume is increased in heavy concrete, heavy concrete As a result, the material is separated from the heavy aggregate and the cement paste due to the sedimentation of the heavy aggregate. For this reason, as the heavy concrete, it is common to use hard concrete with a reduced amount of unit water and a slump value.
- artificial heavy aggregates such as iron scraps; natural heavy aggregates such as magnetite, hematite, and sand iron have been conventionally used.
- These heavy aggregates not only have a large density difference from cement paste, but especially iron ores such as magnetite and hematite have a relatively coarse particle size distribution, so when these iron ores are used as heavy aggregates, Viscosity tends to decrease. Therefore, the conventional heavy concrete has a problem that heavy aggregate with a large particle size settles in the cement paste and the cement paste and heavy aggregate are separated.
- Patent Document 1 Japanese Patent Laid-Open No. 7-25654
- Patent Document 1 attempts to suppress material separation between the cement paste and the heavy aggregate by using the predetermined iron ore as the heavy aggregate. As a result, the price of iron ore is soaring, and the cost of heavy concrete is soaring.
- the present invention is a heavy aggregate that replaces conventionally used iron ore, a heavy fine aggregate and a heavy aggregate that hardly cause material separation from cement paste, and their heavy fine bone
- An object of the present invention is to provide heavy concrete using wood and heavy aggregate.
- the present invention includes 20% by mass or more of an aggregate having a particle size of less than 0.15 mm and 20% by mass or more of an aggregate having a particle size of 2.5 to 5 mm.
- a heavy fine aggregate for hardened heavy concrete having a slump of 0 to 3 cm (Invention 1).
- the heavy fine aggregate of the above invention is composed of aggregates (fine particles) and grains having a particle size of less than 0.15 mm. Since it has a particle size distribution that is unevenly distributed to aggregates (coarse particles) with a diameter of 2.5 mm or more and less than 5 mm, it is possible to obtain sufficient unit volume mass as heavy concrete without causing material separation when blended with concrete.
- the weight fine aggregate which can be provided can be provided.
- the loading of heavyweight concrete into the counterweight box is improved by including 20% by mass or more of aggregates with a particle size of less than 0.15 mm. Can be made. Furthermore, when the aggregate having a particle size of 2.5 mm or more and less than 5 mm is contained in an amount of 20% by mass or more, the fluidity of the concrete is not lowered when blended with heavy concrete.
- the particle size of the aggregate is determined by whether or not it passes through a sieve having a predetermined nominal size.
- an aggregate having a particle size of less than 0.15 mm has a nominal size of 0.15 mm.
- the aggregate passing through the sieve means an aggregate having a particle size of 2.5 mm or more and less than 5 mm, which means an aggregate that passes through a sieve having a nominal size of 5 mm but does not pass through a sieve having a size of 2.5 mm.
- heavy aggregate (including heavy coarse aggregate and heavy fine aggregate) means an aggregate having a density of 3.5 g / cm 3 or more.
- the present invention provides a heavy aggregate for heavy concrete with a slump of 0 to 3 cm, characterized by comprising the heavy fine aggregate according to the inventions (Inventions 1 and 2) and the coarse aggregate. (Invention 3) According to this invention (invention 3), it is possible to provide a heavy aggregate capable of obtaining a sufficient weight as heavy concrete without causing material separation when blended with concrete.
- invention 4 it is preferable to contain 5 mass% or more of fine aggregates with a particle size of less than 0.075 mm (invention 4).
- Invention 4 by containing 5% by mass or more of fine aggregate having a particle size of less than 0.075 mm, the viscosity of the concrete paste can be improved and the density of the paste is increased to increase the aggregate.
- the density difference with (aggregate having a particle size of 0.075 mm or more) can be reduced (density difference: 2.5 g / cm 3 or less).
- material separation in heavy concrete can be more effectively suppressed, when used as an aggregate for heavy concrete such as a counterweight, the filling ratio of heavy concrete into the box of the counterweight is further improved. be able to.
- the coarse aggregate is barite (Invention 5), and the heavy fine aggregate and the coarse aggregate are, for example, It is preferably obtained by crushing barite so that the maximum particle size is 20 to 70 mm (Invention 6).
- the heavy aggregate obtained by coarsely pulverizing barite with a generally used method can more effectively suppress material separation when blended with concrete.
- barite is crushed so as to have a maximum particle size of 20 to 70 mm. It is possible to easily manufacture a heavy aggregate having an aggregate content of less than 15 mm and an aggregate content of aggregates having a particle size of 2.5 mm or more and less than 5 mm. Thus, it is possible to obtain a heavy aggregate that can more effectively suppress material separation when blended with concrete.
- the average tensile strength of the aggregate having a particle diameter of 9 to 11 mm obtained by crushing the barite is 4.0 to 10.0 N / mm 2 .
- the desired fine aggregate particle size distribution can be easily obtained simply by crushing (the aggregate content of the aggregate having a particle size of less than 0.15 mm is 20% by mass or more, and the aggregate content of the aggregate having a particle size of 2.5 to 5 mm is 20 Since a heavy aggregate having a mass% or more) can be obtained, steps such as particle size adjustment can be omitted, and the production cost of heavy aggregate can be reduced.
- the present invention provides a slump comprising the heavy fine aggregate according to the inventions (Inventions 1 and 2) or the heavy aggregate according to the inventions (Inventions 3 to 7), cement, and water.
- a hard concrete with a weight of 0-3 cm Invention 8).
- invention 8 it is possible to provide heavy concrete capable of suppressing the occurrence of material separation, and particularly when used as heavy concrete for filling such as a counterweight, The filling rate can be improved effectively.
- the water cement ratio is preferably 30 to 60% (Invention 9). According to this invention (invention 9), when the water-cement ratio is within the above range, it is possible to obtain high-density heavy concrete with a small amount of unit water and to ensure workability of heavy concrete.
- the heavy aggregate of this embodiment includes a heavy fine aggregate having a predetermined particle size distribution and a coarse aggregate.
- the heavy fine aggregate contains 20% by mass or more of aggregates having a particle size of less than 0.15 mm and 20% by mass or more of aggregates having a particle size of 2.5 mm or more and less than 5 mm. It contains 20% by mass or more of aggregates of less than 15 mm and 25% by mass or more of aggregates having a particle size of 2.5 mm or more and less than 5 mm.
- the content of the aggregate having a particle size of less than 0.15 mm in the heavy fine aggregate is 20% by mass or more, it is possible to effectively suppress the occurrence of material separation from the cement paste when blended with heavy concrete. it can.
- the content of the aggregate having a particle size of 2.5 mm or more and less than 5 mm is 20% by mass or more, the desired workability can be obtained without reducing the fluidity of the concrete when blended with heavy concrete. Can be secured.
- the filling rate of heavy concrete boxes etc. is effectively improved without material separation.
- a heavy coarse aggregate may be used as long as a desired weight can be obtained when blended with heavy concrete, or a general coarse aggregate for concrete.
- Coarse aggregates such as crushed stone and gravel may be used.
- the weight aggregate of this embodiment preferably contains 5% by mass or more of fine aggregate having a particle size of less than 0.075 mm, more preferably 5-10% by mass, and 5-8% by mass. Is particularly preferred.
- fine powder aggregate By including 5% by mass or more of such fine powder aggregate, the viscosity of cement paste in heavy concrete can be improved.
- the density of ordinary Portland cement is 3.16 g / cm 3 and the above fine powder is used. Since the density of the aggregate is 3.5 g / cm 3 or more, the density of the paste can be increased. As a result, occurrence of material separation between the paste and the aggregate can be further suppressed.
- barite can be used as the natural ore that is the raw material of the heavy aggregate of the present embodiment.
- the barite has a density of about 4.0 g / cm 3 and has a sufficient density as a heavy aggregate, and according to the heavy aggregate obtained by pulverizing such barite, the particle size is 0.00. Since a large amount of fine aggregate less than 075 mm is contained, the density difference between the paste and the aggregate can be reduced (density difference: 2.5 g / cm 3 or less), whereby a heavy aggregate obtained from barite and Occurrence of material separation from the paste can be further suppressed.
- the average tensile strength of the aggregate having a particle diameter of 9 to 11 mm obtained by coarsely pulverizing such barite is 4.0 to 10.0 N / mm 2 .
- Such barite is preferably used, and barite having 4.0 to 8.0 N / mm 2 is more preferable.
- the desired fine aggregate particle size distribution (particle size) can be obtained by roughly crushing such barite.
- a weight aggregate having an aggregate content of less than 0.15 mm is 20% by mass or more, and an aggregate having a particle size of 2.5 mm or more and less than 5 mm is 20% by mass or more. There is no need to adjust the particle size after coarse pulverization, the manufacturing process of the heavy aggregate can be simplified, and the manufacturing cost of the heavy aggregate can be reduced.
- the heavy aggregate of this embodiment is obtained by using a crusher (for example, jaw crusher) or the like so that the maximum particle size of the heavy aggregate obtained is 20 to 70 mm, preferably 20 to 50 mm. It can be produced by roughly pulverizing natural ore as a raw material.
- a crusher for example, jaw crusher
- the obtained heavy aggregate After coarsely pulverizing natural ore, the obtained heavy aggregate has a predetermined fine aggregate particle size distribution (bones having a particle size of less than 0.15 mm is 20% by mass or more and a particle size of 2.5 mm or more and less than 5 mm)
- the particle size may be adjusted so that the material is 20% by mass or more.
- the desired fine aggregate particle size distribution (the content ratio of the aggregate having a particle size of less than 0.15 mm is 20% by mass or more by simply coarsely crushing such barite.
- the aggregate content of the aggregate having a particle diameter of 2.5 mm or more and less than 5 mm is 20 mass% or more), and producing a heavy aggregate containing 5 mass% or more of fine aggregate having a particle diameter of less than 0.075 mm it can. Therefore, the step of adjusting the particle size after coarsely pulverizing natural ore can be omitted, and the production cost of heavy aggregate can be reduced.
- the heavy concrete of this embodiment includes the above-mentioned heavy aggregate, cement, and water.
- the cement contained in the heavy concrete according to the present embodiment is not particularly limited.
- various Portland cements such as ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, and low heat Portland cement; blast furnace cement, fly
- Various mixed cements such as ash cement; cement (eco-cement) composed of a pulverized product of gypsum and gypsum produced using municipal waste incineration ash and / or sewage sludge incineration ash as raw materials can be used.
- a water reducing agent for example, a water reducing agent, an antifoamer, etc.
- a water reducing agent for example, a water reducing agent, an antifoamer, etc.
- water reducing agents include, but are not limited to, lignin-based, naphthalene sulfonic acid-based, melamine-based, polycarboxylic acid-based water reducing agents, AE water reducing agents, high-performance water reducing agents, and high-performance AE water reducing agents. is not.
- an antifoaming agent especially when it is necessary to suppress the entrainment of air.
- the heavy concrete of this embodiment can be manufactured by mixing the above heavy aggregate and cement, adding water, and kneading by a conventional method.
- the water cement ratio in the heavy concrete of the present embodiment is not particularly limited, but is preferably 30 to 60%, and more preferably 35 to 50%. When the water-cement ratio is within the above range, it is possible to obtain a high-density heavy concrete with a small amount of unit water and to ensure the workability of the heavy concrete.
- the fine aggregate rate (s / a) in the heavy concrete of this embodiment is preferably 40 to 60%. Furthermore, it is preferable to determine the blending of various concrete raw materials so that the slump at the time of kneading is 0 to 3 cm.
- the heavy concrete obtained in this way can be used as heavy concrete for wave-dissipating blocks, revetments, radiation shielding walls, and bridge weights, but vibration compaction can be achieved with a slump of 0-3 cm. It is particularly useful for such applications, and can be used as heavy concrete for counterweight filling.
- the heavy concrete according to the present embodiment when used as heavy concrete for filling a box such as a counterweight, the heavy concrete according to the present embodiment is poured into a box such as a counterweight, and then subjected to vibration molding.
- the viscosity of heavy concrete can be improved by increasing the content of fine particles (aggregates having a particle size of less than 0.15 mm) in the heavy concrete, and coarse particles (particle size of 2.5 mm or more). Since the content of (aggregate of less than 5 mm) is large, the fluidity of heavy concrete is not lowered, so the filling rate of heavy concrete into the box can be effectively improved, and when performing vibration molding, Occurrence of material separation between cement paste and heavy aggregate in heavy concrete can be further suppressed.
- the heavy fine aggregate and heavy aggregate of this embodiment material separation from the cement paste can be effectively suppressed. Further, according to the heavy concrete of the present embodiment, when used as heavy concrete for filling a counterweight box or the like, it is possible to effectively improve the filling ratio of heavy concrete into the box. .
- the heavy fine aggregate is passed through a sieve having a nominal size of 0.15 to 5.0 mm and passed through each sieve.
- the mass ratio (mass%) of the aggregate was measured.
- the aggregate content (% by mass) having a particle size of less than 0.075 mm in the above-mentioned heavy aggregate (Examples 1 and 2, Comparative Examples 1 to 3) was also measured. The results are shown in Table 2.
- the content of the aggregate having a particle size of less than 0.15 mm is 20% by mass or more, and the bone having a particle size of 2.5 mm or more and less than 5 mm.
- the content of the material was 20% by mass or more, whereas the weight fine aggregate of Comparative Example 1 had a content of less than 20% by mass.
- the weight fine aggregate of Comparative Example 2 has an aggregate content of less than 20% by mass with a particle size of 2.5 mm or more and less than 5 mm, and the weight fine aggregate of Comparative Example 3 has a particle size of less than 0.15 mm.
- the aggregate content was less than 20% by mass.
- the heavy aggregates of Examples 1 and 2 had a content of fine powder aggregates having a particle size of less than 0.075 mm of 5% by mass or more, whereas the heavy aggregates of Comparative Examples 1 to 3 It was less than 5% by mass.
- the average tensile strength of aggregates having a particle diameter of 9 to 11 mm among the aggregates of Examples 1 and 2 was 4.0 to 10.0 N / mm 2 .
- the average tensile strength of aggregates having a particle size of 9 to 11 mm was less than 4.0 N / mm 2 . Therefore, if the barite has an average tensile strength of 4.0 to 10.0 N / mm 2 among aggregates obtained by coarse pulverization, the average particle strength is 9 to 11 mm.
- the content of aggregates having a particle size of less than 0.15 mm is 20% by mass or more, and the content of aggregates having a particle size of 2.5 mm or more and less than 5 mm is 20% by mass or more. It was confirmed that it was possible to manufacture heavy aggregates of the above and heavy aggregates including the heavy fine aggregates.
- the barite has an average tensile strength of 4.0 to 10.0 N / mm 2 among aggregates of 9 to 11 mm among aggregates obtained by coarse pulverization, the particle size is 0. It was confirmed that a heavy aggregate containing 5% by mass or more of fine aggregate less than 0.075 mm can be produced.
- the tensile strength of the heavy aggregates of Examples 1 and 2 is in the range of 4.0 to 10.0 N / mm 2 with little dependence on the particle size.
- the tensile strength of the aggregates of Comparative Examples 4 to 6 increased as the particle size decreased.
- the fine aggregate having a particle size of 5 mm or less is biased toward a large particle size, and the content of the aggregate having a particle size of less than 0.15 mm reaches 20% by mass. There wasn't.
- Heavy aggregate (heavy fine aggregate S, heavy coarse aggregate G) obtained as described above, ordinary Portland cement C (manufactured by Taiheiyo Cement, density: 3.16 g / cm 3 ), water W, Were kneaded with the formulation shown in Table 3 to produce heavy concrete.
- the blends of the heavy concretes of Examples 1 and 2 and Comparative Examples 1 to 3 were determined so that the slump value measured according to JIS-A1101 was 0 to 1.0 cm. Further, in the heavy concretes of Comparative Examples 1 to 3, since the kneading water was insufficient, adjustment water W ′ was added to obtain a slump equivalent to that of Examples 1 and 2.
- the unit volume mass of the heavy concrete after compaction by the above test was measured, and the ratio of the unit volume mass to the design value was calculated as the compaction rate (%). The results are shown in Table 4. Furthermore, the heavy concrete after compaction as described above was visually observed to determine whether or not the cement paste was lifted. The results are shown in Table 4.
- the compaction rate of the heavy concrete of Comparative Example 1 was 2% or more lower than that of the heavy concrete of Example 1 and Example 2.
- the heavy concrete of Comparative Example 1 since material separation occurs, it is considered that the heavy aggregate having a large specific gravity settles at the bottom of the container and the filling rate is lowered.
- the heavy concrete of Example 1 and Example 2 it is thought that a filling rate can be improved effectively, without generating material separation.
- the heavy concrete of Comparative Example 2 has a higher VC value and low fluidity during vibration molding.
- the content of the aggregate having a particle size of 2.5 mm or more and less than 5 mm in the fine aggregate is less than 20% by mass, the aggregate is fine as a whole. It is considered that the fluidity is lowered.
- the heavy concrete of Comparative Example 3 shows a VC value equivalent to that of the heavy concrete of Example 1 and Example 2 and has good workability, but is a heavy fine aggregate with a particle size of less than 0.15 mm. Since the content ratio is less than 20% by mass, some material separation occurs, and a heavy aggregate with a relatively large particle size settles, which is considered to reduce the compaction rate. .
- the heavy fine aggregate and heavy aggregate of the present invention are useful as an aggregate for heavy concrete having good workability and good filling properties, and the heavy concrete of the present invention is particularly filled in a box such as a counterweight. Useful as heavy concrete for vibration molding.
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Abstract
Description
〔重量骨材〕
本実施形態の重量骨材は、所定の粒度分布を有する重量細骨材と、粗骨材とを含むものである。
本実施形態の重量コンクリートは、上述した重量骨材と、セメントと、水とを含むものである。
表1に示す重晶石をそれぞれジョークラッシャー(製品名:ファインジョークラッシャー,前川工業所社製)に投入し、得られる骨材の最大粒径が40mmとなるように粗粉砕し、重量骨材を製造した(実施例1~2,比較例1~3)。
上述のようにして得られた重量骨材(実施例1,実施例2,比較例1)について、地盤工学会基準(JGS 3421-2005)「岩石の点載荷試験方法」に準拠して点載荷試験を行った。本試験例では、より簡易的に骨材強度を得ることを目的として引張強さ(N/mm2)を求めた。また、比較として金属スラグ系骨材(太平洋セメント社製,商品名:DSM骨材,比較例4)、石灰石(比較例5)及び硬質砂岩(比較例6)の引張強さも同様にして求めた。なお、比較例4~6の骨材は、得られる骨材の最大粒径が20mmとなるようにする以外は、実施例1~2及び比較例1~3と同様にして粗粉砕することにより製造した。結果を図1及び図2に示す。
上述のようにして得られた重量骨材(重量細骨材S,重量粗骨材G)と、普通ポルトランドセメントC(太平洋セメント社製,密度:3.16g/cm3)と、水Wとを表3に示す配合で混練し、重量コンクリートを製造した。なお、実施例1~2及び比較例1~3のいずれの重量コンクリートも、JIS-A1101に準拠して測定されるスランプ値が0~1.0cmとなるように配合を決定した。また、比較例1~3の重量コンクリートにおいては、混練水が不足していたため、実施例1~2と同等のスランプを得るために調整水W’を追加した。
上述のようにして得られた重量コンクリート(実施例1~2,比較例1~3)について、JSCE-F507「RCD用コンクリートのコンシステンシー試験方法」に準拠してVC(Vibrating Consolidation)値を測定した。結果を表4に示す。なお、VC値は、コンクリートに振動を加えた際の締め固まるまでの時間を意味し、この値が小さいほど作業性がよいと評価することができる。
Claims (9)
- 粒径0.15mm未満の骨材を20質量%以上含み、かつ粒径2.5mm以上5mm未満の骨材を20質量%以上含むことを特徴とするスランプが0~3cmである固練り重量コンクリート用重量細骨材。
- 前記重量細骨材の全部又は一部が、重晶石であることを特徴とする請求項1に記載の重量細骨材。
- 請求項1又は2に記載の重量細骨材と、粗骨材とを含むことを特徴とするスランプが0~3cmである固練り重量コンクリート用重量骨材。
- 前記重量細骨材及び前記粗骨材には、粒径0.075mm未満の微粒骨材が5質量%以上含まれていることを特徴とする請求項3に記載の重量骨材。
- 前記粗骨材の全部又は一部が、重晶石であることを特徴とする請求項3又は4に記載の重量骨材。
- 前記重量細骨材及び前記粗骨材が、最大粒径が20~70mmとなるように重晶石を破砕することにより得られることを特徴とする請求項3又は4に記載の重量骨材。
- 前記重晶石を破砕することにより得られる粒径9~11mmの骨材の平均引張強さが、4.0~10.0N/mm2であることを特徴とする請求項5又は6に記載の重量骨材。
- 請求項1若しくは2に記載の重量細骨材又は請求項3~7のいずれかに記載の重量骨材と、セメントと、水とを含むことを特徴とするスランプが0~3cmである固練り重量コンクリート。
- 水セメント比が、30~60%であることを特徴とする請求項8に記載の重量コンクリート。
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KR1020097002785A KR100930658B1 (ko) | 2008-05-23 | 2009-01-16 | 중량골재 및 중량콘크리트 |
US12/521,088 US20110073016A1 (en) | 2008-05-23 | 2009-01-16 | Heavyweight aggregate and heavyweight concrete |
US13/149,465 US20110226163A1 (en) | 2008-05-23 | 2011-05-31 | Method for manufacturing heavyweight aggregate and heavyweight concrete |
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JP2008135958A JP4253355B1 (ja) | 2008-05-23 | 2008-05-23 | 重量骨材及び重量コンクリート |
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JP2013137288A (ja) * | 2011-11-30 | 2013-07-11 | Masahiro Yoshimura | 放射性廃棄土を収納する密閉遮蔽石粉容器 |
JP2014231450A (ja) * | 2013-05-29 | 2014-12-11 | 日本ヒューム株式会社 | 重量コンクリートによるプレキャストコンクリート製品の製造方法 |
JP2019002817A (ja) * | 2017-06-16 | 2019-01-10 | 一般社団法人Nb研究所 | 放射能汚染物用の表層被覆材料及び放射能汚染物用の表層被覆構造 |
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BRPI0913036A2 (pt) * | 2008-05-23 | 2019-09-24 | Komatsu Mfg Co Ltd | contrapeso |
JP5507153B2 (ja) * | 2009-08-21 | 2014-05-28 | 太平洋セメント株式会社 | 可撓性重量コンクリート及び可撓性コンクリート構造物 |
JP2014025722A (ja) * | 2012-07-24 | 2014-02-06 | Ohbayashi Corp | 海水で練り混ぜた放射線遮蔽用コンクリート |
US10930405B2 (en) * | 2015-03-03 | 2021-02-23 | The King Abdulaziz City For Science And Technology | Mixture for anti-radiation pozzolon-polymeric cementitious material |
CN109320114B (zh) * | 2018-10-26 | 2021-02-19 | 广东清大同科环保技术有限公司 | 一种防辐射高强集料及其制备方法和混凝土 |
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JP2006273654A (ja) * | 2005-03-29 | 2006-10-12 | Taiheiyo Cement Corp | 重量コンクリート |
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2009
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JP2006273654A (ja) * | 2005-03-29 | 2006-10-12 | Taiheiyo Cement Corp | 重量コンクリート |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013137288A (ja) * | 2011-11-30 | 2013-07-11 | Masahiro Yoshimura | 放射性廃棄土を収納する密閉遮蔽石粉容器 |
JP2014231450A (ja) * | 2013-05-29 | 2014-12-11 | 日本ヒューム株式会社 | 重量コンクリートによるプレキャストコンクリート製品の製造方法 |
JP2019002817A (ja) * | 2017-06-16 | 2019-01-10 | 一般社団法人Nb研究所 | 放射能汚染物用の表層被覆材料及び放射能汚染物用の表層被覆構造 |
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KR100930658B1 (ko) | 2009-12-09 |
US20110226163A1 (en) | 2011-09-22 |
JP4253355B1 (ja) | 2009-04-08 |
KR20090125743A (ko) | 2009-12-07 |
JP2009280460A (ja) | 2009-12-03 |
US20110073016A1 (en) | 2011-03-31 |
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