JP2596109B2 - Composition for producing heavy concrete and method for producing heavy concrete - Google Patents
Composition for producing heavy concrete and method for producing heavy concreteInfo
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- JP2596109B2 JP2596109B2 JP33456988A JP33456988A JP2596109B2 JP 2596109 B2 JP2596109 B2 JP 2596109B2 JP 33456988 A JP33456988 A JP 33456988A JP 33456988 A JP33456988 A JP 33456988A JP 2596109 B2 JP2596109 B2 JP 2596109B2
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- cement
- heavy concrete
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- aggregate
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Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、比重が高く、機械的特性の優れた重量コン
クリート製造用組成物及び重量コンクリートの製造法に
関する。Description: TECHNICAL FIELD The present invention relates to a composition for producing heavy concrete, which has a high specific gravity and excellent mechanical properties, and a method for producing heavy concrete.
（従来の技術及び発明が解決しようとする課題） 骨材に磁鉄鉱、チタン鉱、重晶石、かんらん石等の比
重の高い材料を用いたコンクリートは重量コンクリート
といわれ、消波ブロック、護岸堤等の海洋工事用コンク
リート、重量機械基盤用コンクリート、放射線遮へい用
コンクリート等として用いられている。(Problems to be solved by the prior art and the invention) Concrete using high specific gravity materials such as magnetite, titanium ore, barite, and olivine as aggregates is referred to as heavy concrete, wave breaking blocks and seawalls. It is used as concrete for offshore construction, concrete for heavy machinery base, concrete for radiation shielding, etc.
しかし、重量コンクリートの製造に際しては、その生
コンクリートとしての運搬中、打設中、のた硬化途中に
おいて、高比重の骨材が沈降・分離し易く、均質な高比
重重量コンクリートを製造することが困難である。However, in the production of heavy concrete, it is easy to settle and separate high-specific-gravity aggregates during transportation as concrete, during casting, and during hardening. Have difficulty.
また、これを回避するために、生コンクリートの水／
セメント比を小さくすると、施工性が悪くなり、製品重
量コンクリートの化学的、機械的特性も劣化する。In order to avoid this, water /
When the cement ratio is reduced, the workability is deteriorated, and the chemical and mechanical properties of the product weight concrete are also deteriorated.
（課題を解決するための手段） 本発明は、前記問題点に鑑みてなされたもので、生コ
ンクリートの運搬中、打設中、硬化途中等における高比
重骨材とセメントペーストとの比重差による分離を阻止
し、高比重、高強度の重量コンクリートを提供するもの
であって、すなわち、（１）粗骨材としての酸化鉄鉱石
及び細骨材としての砂鉄の総量70〜90重量％、水／セメ
ント比0.25〜0.7のセメントペースト８〜30重量％及び
繊維長１〜10mmの炭素繊維0.05〜１重量％とからなるこ
とを特徴とする重量コンクリート製造用組成物及び
（２）粗骨材としての酸化鉄鉱石及び細骨材としての砂
鉄の総量70〜90重量％、水／セメント比0.3〜0.7のセメ
ントペースト８〜30重量％及び繊維長１〜10mmの炭素繊
維0.05〜１重量％からなる組成物を型枠内に入れ養生硬
化せしめることを特徴とする重量コンクリートの製造法
である。(Means for Solving the Problems) The present invention has been made in view of the above problems, and is based on a difference in specific gravity between a high-specific-gravity aggregate and a cement paste during transportation, placing, and hardening of ready-mixed concrete. The present invention provides a concrete with high specific gravity and high strength by preventing separation, that is, (1) a total amount of iron oxide ore as coarse aggregate and iron sand as fine aggregate of 70 to 90% by weight, water A cement composition having a cement ratio of 0.25 to 0.7% and a carbon fiber having a fiber length of 1 to 10 mm and a carbon fiber having a fiber length of 0.05 to 1% by weight. The total amount of iron oxide ore and iron sand as fine aggregate is 70 to 90% by weight, 8 to 30% by weight of cement paste having a water / cement ratio of 0.3 to 0.7, and 0.05 to 1% by weight of carbon fiber having a fiber length of 1 to 10 mm. Put the composition in a mold and cure It is a manufacturing method of a heavy concrete, characterized in.
従来、重量コンクリートの製造において、かんらん
石、酸化鉄鉱石などの粗骨材に砂などの細骨材とセメン
ト、水とを混合して、これを流し込み施工していたが、
酸化鉄鉱石は比重が高いため、下方へ沈んでしまう分離
現象が生じる問題があった。Conventionally, in the production of heavy concrete, olivine, fine aggregate such as sand, cement, and water were mixed with coarse aggregate such as iron oxide ore, and this was poured and constructed.
Since iron oxide ore has a high specific gravity, there is a problem that a separation phenomenon of sinking downward occurs.
本発明者は種々研究の結果、細骨材を比重の高い砂鉄
とすることにより、さらに炭素繊維を加配してセメント
ペースト量を減らすことにより、この分離現象の発生を
低減できることを見出だした。As a result of various studies, the present inventor has found that the occurrence of this separation phenomenon can be reduced by using fine iron sand as the fine aggregate and further reducing the amount of cement paste by adding carbon fibers.
細骨材に砂鉄を用いることにより、粗骨材、細骨材の
双方共に比重の高い材料とする一方、セメントと水から
なるセメントペースト分は比重の低い材料となったの
で、比重差から粗、細骨材が沈降し、セメントペースト
分が上方に残って、分離が生じるものとも予想されたけ
れども、この予想を覆すことができた。By using iron sand as the fine aggregate, both the coarse and fine aggregates have a high specific gravity, while the cement paste composed of cement and water has a low specific gravity. Although it was expected that the fine aggregate settled and the cement paste remained above and separation would occur, this expectation could be reversed.
さらに、粗骨材に酸化酸化鉄鉱石を用いることによ
り、水、海水等の化学環境に対する安定性を高めること
ができた。Furthermore, by using iron oxide oxide ore as the coarse aggregate, the stability to chemical environments such as water and seawater could be improved.
骨材と水、海水との接触に際しては、骨材が硫化鉱で
あると、硫黄分が気、水中の酸素、水及びセメントから
生成する水酸化カルシウムと反応して、（１）硫化鉄＋
酸素＋水又は海水＋水酸化カルシウム ［膨張］：石膏＋水酸化鉄 （２）石膏＋アルミン酸カルシウム（セメント中の）＋
水 ［膨張］：エトリンガイト となり、組織内に膨張現象が生じる結果、重量コンクリ
ートの機械的強度が劣化し、化学的特性も劣化する。When the aggregate is in contact with water or seawater, if the aggregate is a sulfide ore, the sulfur reacts with air, oxygen in the water, calcium hydroxide generated from water and cement, and (1) iron sulfide +
Oxygen + water or seawater + calcium hydroxide [expansion]: gypsum + iron hydroxide (2) gypsum + calcium aluminate (in cement) +
Water [Expansion]: It becomes ettringite, and as a result of an expansion phenomenon occurring in the structure, the mechanical strength of heavy concrete deteriorates and its chemical properties also deteriorate.
これに対して、本発明では粗骨材及び細骨材の両者に
酸化酸化鉄鉱石を用いるため、海水等の化学的環境下で
優れた安定性を有するものとなる。On the other hand, in the present invention, iron oxide oxide ore is used for both the coarse aggregate and the fine aggregate, so that it has excellent stability under a chemical environment such as seawater.
本発明では、このようにして粗、細骨材を共に高比重
の材料となすことによって、全体として高比重の重量コ
ンクリートを提供することができるのである。In the present invention, by using both the coarse and fine aggregates as materials having a high specific gravity in this way, it is possible to provide heavy concrete having a high specific gravity as a whole.
粗骨材の酸化鉄鉱石としては、赤鉄鉱、磁鉄鉱等があ
り、比重が約4.0〜5.0、粒度が粒径約５〜60mmのものが
好適に使用される。Iron oxide ores of coarse aggregate include hematite and magnetite, and those having a specific gravity of about 4.0 to 5.0 and a particle size of about 5 to 60 mm are preferably used.
細骨材の砂鉄としては、磁鉄鉱、赤鉄鉱、褐鉄鉱等を
主体し、比重が約4.0〜5.0、粒径が約5mm以下（50〜200
メッシュ程度）のものが使用される。Fine iron sand is mainly composed of magnetite, hematite, limonite, etc., with a specific gravity of about 4.0 to 5.0 and a particle size of about 5 mm or less (50 to 200 mm).
Mesh).
細骨材率は0.3〜0.5が好ましく、0.3より少ないと製
品コンクリートが粗面化し、強度も不十分なものとな
り、かつ比重も低くなり、また施工に際し、セメントペ
ーストと粗骨材との分離現象が生じてしまう。0.5を越
えるとコンクリート製造用組成物の流動性がなくなり、
ワーカビリティのよいものとならない。The fine aggregate ratio is preferably 0.3 to 0.5, and if it is less than 0.3, the product concrete is roughened, the strength becomes insufficient, and the specific gravity becomes low, and at the time of construction, the separation phenomenon of cement paste and coarse aggregate Will occur. When it exceeds 0.5, the fluidity of the composition for concrete production disappears,
It does not provide good workability.
総骨材量は製品重量コンクリートの70〜90重量％が好
ましく、70重量％より少ないと製品の比重が低くなり、
かつ不経済なものとなり、90重量％を越えると施工性が
悪化する。The total amount of aggregate is preferably 70 to 90% by weight of the product weight concrete, and if it is less than 70% by weight, the specific gravity of the product will be low,
And it becomes uneconomical, and when it exceeds 90% by weight, the workability deteriorates.
セメントとしては、普通ポルトランドセメント、高炉
セメントやフライアッシュセメント等の混合セメント、
アルミナセメント等が使用され、その配合量は1m3当た
り200〜450kgが好ましい。As cement, mixed cement such as ordinary Portland cement, blast furnace cement and fly ash cement,
Alumina cement or the like is used, the amount thereof 1 m 3 per 200~450kg are preferred.
200kgより少ないと製品重量コンクリートが弱強度の
ものとなり、450kgを越えると製品の比重が低くなって
好ましくない。If it is less than 200 kg, the product weight concrete will have low strength, and if it exceeds 450 kg, the specific gravity of the product will be low, which is not preferable.
本発明においては、炭素繊維を加えるが、これは繊維
長が１〜10mm程度のものでよく、良品の長炭素繊維製造
時に副産する廃品であってもよい。In the present invention, carbon fiber is added, which may have a fiber length of about 1 to 10 mm, and may be a waste product by-produced at the time of producing a good long carbon fiber.
長繊維は、セメントペーストと骨材等との混和が均質
化できないため好ましくなく、１〜10mmのものが均質混
和が達成できるので好ましい。The long fibers are not preferable because the mixing of the cement paste and the aggregate cannot be homogenized, and those having a length of 1 to 10 mm are preferable because the homogeneous mixing can be achieved.
炭素繊維は、直径８μｍ前後、引張強度5,000kg/cm2
以上もあり、スチール繊維よりも強く、補強効果が大き
い。また、耐熱性はきわめて良く、セメントとの結合性
も良い。Carbon fiber has a diameter of around 8 μm and a tensile strength of 5,000 kg / cm 2
As mentioned above, it is stronger than steel fiber and has a large reinforcing effect. Further, the heat resistance is very good, and the bondability with cement is also good.
なお、炭素繊維としては、特にピッチ系のものが好ま
しい。In addition, as the carbon fiber, a pitch-based carbon fiber is particularly preferable.
一般に、コンクリートは圧縮強度が極めて高いもので
あるが、引張、曲げには弱い。そこで本発明では、炭素
繊維を加配することによって、引張、曲げ強度を高めよ
うとするものであるが、さらに次のような格別な役割を
果たすものである。すなわち、炭素繊維は、高比重骨材
とセメントペーストとの間でそれらの移動を妨げるごと
くジャングルジム状に介在して、それらの比重差による
沈降分離を十分に阻止する結果、均質な高強度の重量コ
ンクリートを提供することができるのである。Generally, concrete has extremely high compressive strength, but is weak in tension and bending. Thus, in the present invention, the tensile and bending strengths are increased by distributing carbon fibers, but they further play a special role as follows. That is, the carbon fibers are interposed in the form of a jungle gym so as to hinder their movement between the high specific gravity aggregate and the cement paste, and sufficiently prevent sedimentation and separation due to their specific gravity difference, resulting in a homogeneous high strength. Heavy concrete can be provided.
この添加量は、0.05〜１重量％が好ましく、炭素繊維
／セメント比、すなわちセメント重量に対する炭素繊維
の重量の割合は、1.0〜10％が好ましい。The addition amount is preferably 0.05 to 1% by weight, and the carbon fiber / cement ratio, that is, the ratio of the weight of carbon fiber to the weight of cement is preferably 1.0 to 10%.
1.0％より少ないと重量コンクリートの施工時に骨材
とセメントペーストとの沈降分離現象が生じ易くなり、
かつ製品重量コンクリートの機械的強度も十分でなく、
10％を越えると施工時のワーカビリティが悪くなり、か
つ不経済なものとなる。If it is less than 1.0%, sedimentation and separation of aggregate and cement paste is likely to occur during construction of heavy concrete,
And the mechanical strength of the product weight concrete is not enough,
If it exceeds 10%, workability at the time of construction deteriorates, and it becomes uneconomical.
なお、一般の重量コンクリートの製造におけると同様
に、その他周知の混和剤を添加することを妨げるもので
はない。In addition, as in the production of general heavy-duty concrete, it does not prevent the addition of other well-known admixtures.
（実施例） 本発明を実施例によって、具体的に説明する。(Examples) The present invention will be specifically described by way of examples.
以下に示す原材料を本例重量コンクリートの製造用に
使用した。The following raw materials were used for the production of heavy concrete in this example.
「粗骨材」 南アフリカ産の赤鉄鉱：平均粒径25mm、比重4.86、スリ
ヘリ減量14.7％、粗粒率7.33 「細骨材」 ニュージランド産の砂鉄（磁鉄鉱）：平均粒径0.15mm、
比重4.54 「セメント」 普通ポルトランドセメント：比重3.16 「炭素繊維」 比重1.6、直径10μｍ、繊維長6mm、 引張強度10,000kg/cm2、 前躯体：ピッチ 「練り混ぜ用水」 上水道水 「混和剤」 “T0−20"（竹本油脂株式会社製 含窒素型スルホン酸
塩の高性能減水剤） 以上の原材料を第１表に示す割合で配合して供試体Ａ
及びＢとし、可傾式ミキサーを用いて、３分間攪拌した
後型枠に流し込み、脱型した後、そのまま湿空ないし気
中にて養生、あるいは水中にて養生を行った。"Coarse aggregate" Hematite from South Africa: average particle size 25mm, specific gravity 4.86, weight loss 14.7%, coarse particle ratio 7.33 "fine aggregate" Sandstone (magnetite) from New Zealand: average particle size 0.15mm,
Specific gravity 4.54 “Cement” Ordinary Portland cement: specific gravity 3.16 “Carbon fiber” Specific gravity 1.6, diameter 10 μm, fiber length 6 mm, tensile strength 10,000 kg / cm 2 , Precursor: pitch “mixing water” tap water “admixture” “T0 -20 "(manufactured by Takemoto Yushi Co., Ltd., a high performance water reducing agent for nitrogen-containing sulfonate) Specimen A prepared by mixing the above raw materials at the ratios shown in Table 1.
After stirring for 3 minutes using a tilting mixer, the mixture was poured into a mold, demolded, and then directly cured in wet air or air, or cured in water.
なお、比較のため炭素繊維を加配しない配合物を供試
体Ｃとし、同様の処理を施した。For the purpose of comparison, a mixture without addition of carbon fiber was used as sample C and subjected to the same treatment.
その結果、本発明実施例の供試体Ａ及びＢは、第１表
に示すごとく、骨材とセメントペーストとの分離がほと
んどなく、かつ施工性も良いものであった。また製品重
量コンクリートは、特に引張、曲げ等の機械的強度が高
く、耐摩耗性も優れたものであった。As a result, as shown in Table 1, the specimens A and B of the examples of the present invention hardly separated the aggregate and the cement paste, and had good workability. The product weight concrete had particularly high mechanical strength such as tension and bending, and also had excellent wear resistance.
なお、耐摩耗試験は、スパイク式簡易ラベリング試験
（DB型）により行った。 In addition, the abrasion resistance test was performed by a spike type simple labeling test (DB type).
試験供試体は12時間以上養生したもので、10cmφ、厚
さ４〜6cmのものを使用し、スパイク回転速度:90回／
分、テーブル回転速度:5回／分、軸荷重:25kg、試験回
転数:1000回、供試体表面：湿潤状態、の条件下で行っ
た。The test specimen was cured for 12 hours or more, and used a specimen with a diameter of 10 cm and a thickness of 4 to 6 cm. Spike rotation speed: 90 times /
Minutes, table rotation speed: 5 times / minute, axial load: 25 kg, test rotation speed: 1000 times, test specimen surface: wet condition.
本発明において、炭素繊維を加配することの有意義性
は、配合物中で炭素繊維がジャングルジム状に介在して
高比重骨材とセメントペーストとの分離を十分に阻止
し、また単位水量を減ずることができてブリージング抵
抗性も増すこと、及び炭素繊維とセメントペーストが強
く結合して骨材に付着し、機械的強度の優れた重量コン
クリートが得られること、である。In the present invention, the significance of distributing the carbon fibers is that the carbon fibers intervene in a jungle gym-like manner in the composition to sufficiently prevent the separation of the high specific gravity aggregate and the cement paste, and also reduce the unit water amount. The carbon fiber and the cement paste are strongly bonded and adhere to the aggregate, and a heavy concrete with excellent mechanical strength is obtained.
本発明により得られる重量コンクリートは、比重が3.
6〜4.0と非常に高く、かつ機械的強度、耐摩耗性が優れ
ているため、砕波衝撃を受ける海洋構造物、例えば消波
ブロック（離岸堤）、防波堤の防護層、岸壁、魚礁等に
好適に使用される。The heavy concrete obtained by the present invention has a specific gravity of 3.
Because of its extremely high mechanical strength and abrasion resistance of 6-4.0, it is suitable for marine structures that are subject to breaking waves, such as wave-breaking blocks (breakwaters), breakwater protection layers, quays, fish reefs, etc. It is preferably used.
（発明の効果） 以上に説明したとおり、本発明によれば、施工時等に
おける高比重骨材とセメントペーストとの比重差による
分離が十分に阻止でき、ブリージング抵抗性も増し、機
械的強度、耐摩耗性の優れた重量コンクリートが提供で
きるものである。(Effects of the Invention) As described above, according to the present invention, the separation due to the specific gravity difference between the high specific gravity aggregate and the cement paste at the time of construction or the like can be sufficiently prevented, the breathing resistance can be increased, and the mechanical strength, It is possible to provide a heavy concrete with excellent wear resistance.
本発明により得られた重量コンクリートは、比重が3.
6〜4.0と非常に高く、かつ機械的強度が優れているた
め、砕波衝撃を受ける消波ブロック（離岸堤）などの海
洋構造物に好適に適用できる。The heavy concrete obtained by the present invention has a specific gravity of 3.
Since it is extremely high at 6 to 4.0 and has excellent mechanical strength, it can be suitably applied to marine structures such as wave-dissipating blocks (offshore breakwaters) that are subjected to breaking waves.
Claims (4)
ての砂鉄の総量70〜90重量％、水／セメント比0.25〜0.
7のセメントペースト８〜30重量％及び繊維長１〜10mm
の炭素繊維0.05〜１重量％とからなることを特徴とする
重量コンクリート製造用組成物。1. A total amount of iron oxide ore as a coarse aggregate and iron sand as a fine aggregate of 70 to 90% by weight, and a water / cement ratio of 0.25 to 0.2.
8 to 30% by weight of cement paste and fiber length of 1 to 10mm
A composition for producing heavy concrete, characterized by comprising 0.05 to 1% by weight of carbon fiber.
ての砂鉄の総量70〜90重量％、水／セメント比0.3〜0.7
のセメントペースト８〜30重量％及び繊維長１〜10mmの
炭素繊維0.05〜１重量％からなる組成物を型枠内に入れ
養生硬化せしめることを特徴とする重量コンクリートの
製造法。2. A total amount of iron oxide ore as a coarse aggregate and iron sand as a fine aggregate of 70 to 90% by weight, and a water / cement ratio of 0.3 to 0.7.
A method for producing heavy concrete, characterized in that a composition comprising 8 to 30% by weight of a cement paste and 0.05 to 1% by weight of carbon fibers having a fiber length of 1 to 10 mm is placed in a mold and cured.
ることを特徴とする請求項２記載の重量コンクリートの
製造法。3. The method for producing heavy concrete according to claim 2, wherein the fine aggregate ratio is 0.3 to 0.5.
とを特徴とする請求項２又は３記載の重量コンクリート
の製造法。4. The method for producing heavy concrete according to claim 2, wherein the cement is Portland cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33456988A JP2596109B2 (en) | 1987-12-30 | 1988-12-29 | Composition for producing heavy concrete and method for producing heavy concrete |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62-333995 | 1987-12-30 | ||
| JP33399587 | 1987-12-30 | ||
| JP33456988A JP2596109B2 (en) | 1987-12-30 | 1988-12-29 | Composition for producing heavy concrete and method for producing heavy concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01301550A JPH01301550A (en) | 1989-12-05 |
| JP2596109B2 true JP2596109B2 (en) | 1997-04-02 |
Family
ID=26574695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33456988A Expired - Lifetime JP2596109B2 (en) | 1987-12-30 | 1988-12-29 | Composition for producing heavy concrete and method for producing heavy concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2596109B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030511A (en) * | 2010-10-27 | 2011-04-27 | 朱奎 | Antimagnetic gypsum board |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100368644B1 (en) * | 2001-11-23 | 2003-01-24 | Intchem Co Ltd | Inorganic coating composition for electro magnetic shielding of building |
| JP5054906B2 (en) * | 2005-09-09 | 2012-10-24 | 東レ株式会社 | Carbon fiber composite resin wire for reinforcing concrete or mortar, method for producing the same, and concrete or mortar structure |
| CN115159900A (en) * | 2022-04-21 | 2022-10-11 | 湖北工业大学 | Preparation method of anti-radiation and anti-impact concrete |
-
1988
- 1988-12-29 JP JP33456988A patent/JP2596109B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102030511A (en) * | 2010-10-27 | 2011-04-27 | 朱奎 | Antimagnetic gypsum board |
| CN102030511B (en) * | 2010-10-27 | 2012-08-22 | 朱奎 | Antimagnetic gypsum board |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01301550A (en) | 1989-12-05 |
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