JP2001226159A - Method for kneading concrete - Google Patents

Method for kneading concrete

Info

Publication number
JP2001226159A
JP2001226159A JP2000077220A JP2000077220A JP2001226159A JP 2001226159 A JP2001226159 A JP 2001226159A JP 2000077220 A JP2000077220 A JP 2000077220A JP 2000077220 A JP2000077220 A JP 2000077220A JP 2001226159 A JP2001226159 A JP 2001226159A
Authority
JP
Japan
Prior art keywords
cement
kneading
particle size
weight
present
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
JP2000077220A
Other languages
Japanese (ja)
Inventor
Hitoshi Hatano
倫 波多野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nihon Solid Co Ltd
Original Assignee
Nihon Solid Co Ltd
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 Nihon Solid Co Ltd filed Critical Nihon Solid Co Ltd
Priority to JP2000077220A priority Critical patent/JP2001226159A/en
Publication of JP2001226159A publication Critical patent/JP2001226159A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • 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
    • C04B2111/10—Compositions or ingredients thereof characterised by the absence or the very low content of a specific material
    • C04B2111/1075—Chromium-free or very low chromium-content materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method which prevents the effluence of chromium, heavy metals, or the like, into bleeding water, or the like, in making cement products or cement structures. SOLUTION: This method for kneading cement consists in executing kneading of the cement in the presence of 10 to 200 wt.% fine grain materials of 10 μm to 50 nm in grain size in the cement when kneading the cement.

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、セメント製品の製
造あるいはセメント構造物を構築するときに使用される
セメントの混練方法およびその混練時に使用されるセメ
ント添加剤に関する。The present invention relates to a method for kneading cement used for producing cement products or constructing cement structures, and a cement additive used for kneading the cement.

【０００２】[0002]

【従来の技術】セメントは製造時に使用する焼成窯のク
ロム−マグネシヤ系の耐火材と原料間の種々の高温熱化
学反応を経て、微量ではあるが不可逆的にクロム及び重
金属等を含有している。このクロム及び重金属等はセメ
ントと水が混練されると、その水中に溶解し、その水が
流出することなくコンクリートとして固化する場合はク
ロム及び重金属等はコンクリート中に固定され問題とな
ることはない。2. Description of the Related Art Cement contains chromium and heavy metals in a small amount but irreversibly through various high-temperature thermochemical reactions between chromium-magnesia-based refractory materials and raw materials in a firing furnace used in manufacturing. . This chromium and heavy metals dissolve in the water when the cement and water are kneaded, and when the water solidifies as concrete without flowing out, the chromium and heavy metals are fixed in the concrete and cause no problem .

【０００３】しかしながらブリージング水として放出さ
れる場合、および未固化の状態で洗浄水と混合されて放
出される場合は、環境に放流されて環境汚染の点から問
題となっていた。特に六価クロムが流出すると、六価ク
ロムは酸化力が強く、そのために自然界へ流出した場合
は健康上有害な物質として各種法令で厳しく規制されて
いる。[0003] However, when discharged as breathing water, or when discharged in a state of being mixed with washing water in an unsolidified state, it is discharged into the environment, which poses a problem in terms of environmental pollution. In particular, when hexavalent chromium flows out, hexavalent chromium has a strong oxidizing power, and when it flows into nature, it is strictly regulated by various laws and regulations as a substance harmful to health.

【０００４】前記のような状況にあって、これらの問題
点を解決する方法が種々提案されている。例えば、コン
クリート構造物を作る際にセメント混練時に還元剤を存
在せしめて六価クロム等を放出させないことを特徴とす
るセメント混練方法（特許第２８７６４４１号公報参
照）。六価クロムを含有するスラッジに対し、水酸化第
一鉄を無水塩に換算して含有六価クロムの当量の少なく
とも２倍加えてセメントによる混練固型化を行うことに
より、六価クロムを還元することを特徴とする六価クロ
ム含有スラッジの固型化処理方法（特開昭５２−９３６
６９号公報参照）。さらに生コンクリート製造またはセ
メント製品製造において、セメント、骨材および水の練
り混ぜに際し、使用水に所要の第一鉄塩溶液を添加する
ことを特徴とする廃水中にクロムイオンを生じないセメ
ント製品の製造方法が提案されている（特開昭５０−４
３１２３号公報参照）。In the above situation, various methods for solving these problems have been proposed. For example, a cement kneading method characterized in that a reducing agent is present during kneading cement to prevent hexavalent chromium or the like from being released when a concrete structure is produced (see Japanese Patent No. 2876441). Reduced hexavalent chromium by adding ferrous hydroxide to sludge containing hexavalent chromium at least twice the equivalent of hexavalent chromium converted to anhydrous salt and kneading and solidifying with cement. Solidification treatment of sludge containing hexavalent chromium (JP-A-52-936)
No. 69). Furthermore, in the production of ready-mixed concrete or cement products, cement products that do not produce chromium ions in wastewater, which are characterized by adding the required ferrous salt solution to the water used when mixing cement, aggregate and water. A manufacturing method has been proposed (Japanese Patent Laid-Open No. Sho 50-4).
No. 3123).

【０００５】[0005]

【発明が解決しようとする課題】しかしながら、前記し
た各種方法はいずれも酸化還元反応を利用した化学的な
処理方法であることから操作性に問題があった。そこで
本発明者は簡便な処理方法について種々検討を重ねた結
果、本発明を完成するに至った。However, each of the above-mentioned various methods has a problem in operability since it is a chemical treatment method utilizing an oxidation-reduction reaction. The inventor has conducted various studies on a simple processing method, and as a result, has completed the present invention.

【０００６】[0006]

【発明を解決するための手段】すなわち本発明は、セメ
ント混練の際に、セメントに対し粒径１０μｍ〜５０ｎ
ｍの微粒材１０〜２００重量％の存在下に行うことを特
徴とするセメントの混練方法およびそれに使用するセメ
ント添加剤に係るものである。That is, according to the present invention, a particle size of 10 μm to 50 n is added to the cement at the time of cement kneading.
The present invention relates to a method for kneading cement, which is carried out in the presence of 10 to 200% by weight of fine particles of m, and a cement additive used therefor.

【０００７】本発明に使用する微粒材の素材としては、
高炉スラグ、非鉄金属スラグ、製鋼スラグ、クリンカー
アッシュ、フライアッシュ、シンダーアッシュ、石炭
灰、チタン酸カリウム、炭酸カルシウム、ウオラストナ
イト、タルク、マイカ、ホウ酸アルミニウム、水酸化ア
ルミニウム、水酸化マグネシウム、塩基性炭酸マグネシ
ウム、カーボンブラック、グラファイト、鉄粉、鉛粉、
酸化鉄、磁性流体、ファインセラミック等が挙げられ
る。[0007] The material of the fine particles used in the present invention includes:
Blast furnace slag, non-ferrous metal slag, steelmaking slag, clinker ash, fly ash, cinder ash, coal ash, potassium titanate, calcium carbonate, wollastonite, talc, mica, aluminum borate, aluminum hydroxide, magnesium hydroxide, base Magnesium carbonate, carbon black, graphite, iron powder, lead powder,
Examples include iron oxide, magnetic fluid, and fine ceramic.

【０００８】前記微粒材は、表面解離基による帯電、吸
着イオンによる帯電、格子欠陥による帯電が生ずる素材
が好ましい。[0008] The fine particles are preferably made of a material which is charged by surface dissociation groups, charged by adsorbed ions, and charged by lattice defects.

【０００９】そして前記微粒材の粒径は１０μｍ〜５０
ｎｍであることが必要である。粒径が１０μｍより大き
いとクロム及び重金属等の吸着効果が充分でなく、また
５０ｎｍより小さくなると前記と同様に吸着効果が表わ
れない。前記の素材から本発明に使用する微粒材を調整
するには、公知の方法で粉砕したり、分級したりして所
望の粒径のものを取得する。The fine particles have a particle size of 10 μm to 50 μm.
nm. When the particle size is larger than 10 μm, the effect of adsorbing chromium and heavy metals is not sufficient, and when the particle size is smaller than 50 nm, the adsorbing effect is not exhibited as described above. In order to adjust the fine-grained material used in the present invention from the above-mentioned materials, a material having a desired particle size is obtained by crushing or classifying by a known method.

【００１０】本発明の粒径１０μｍ〜５０ｎｍの微粒材
の使用量としては、セメントに対し１０〜２００重量
％、好ましくは５０〜１４０重量％の範囲である。前記
微粒材の使用量が１０重量％より少ないと本発明の所期
の目的が達成されず、また２００重量％より多いと構造
物の強度等に影響を及ぼすので好ましくない。The amount of the fine particles having a particle size of 10 μm to 50 nm according to the present invention is in the range of 10 to 200% by weight, preferably 50 to 140% by weight, based on the cement. If the amount of the fine particles is less than 10% by weight, the intended object of the present invention is not achieved, and if it is more than 200% by weight, the strength of the structure is adversely affected.

【００１１】本発明に係る粒径１０μｍ〜５０ｎｍの微
粒材からなるセメント添加剤は、予めセメント中に添加
しておいてもよく、またセメントと水を混練するときに
粉末状で直接添加するか、予め使用する水中に加えてか
ら使用してもよい。[0011] The cement additive according to the present invention, which is composed of fine particles having a particle size of 10 µm to 50 nm, may be added in advance to the cement, or may be directly added in powder form when kneading the cement and water. May be used after being added to the water to be used in advance.

【００１２】[0012]

【実施例】次に本発明をさらに具体的に示すために実施
例を揚げるが、本発明は以下の実施例のみに限定される
ものではない。 実施例 セメント２３０重量部、水１７５重量部、市販の製鋼ス
ラグ６２５重量部、粒径５０μｍ〜１μｍのフライアッ
シュ１６９重量部、骨材１０６１重量部およびＡＥ剤
２．４重量部を均一に混練してＦＳコンクリートを作っ
た。そして経時的にブリージング水中の六価クロムのみ
を測定した結果、２０分後０．０８３ｐｐｍ、４０分後
０．０５ｐｐｍ、２時間後０．０３７ｐｐｍ、４時間後
０．０１２ｐｐｍであった。上記の試験結果より、特に
本発明方法は橋脚、ダム、ケーソン、消波ブロック等の
構造物の構築の時に使用すると効果的である。EXAMPLES Next, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples. Example 230 parts by weight of cement, 175 parts by weight of water, 625 parts by weight of commercially available steelmaking slag, 169 parts by weight of fly ash having a particle size of 50 μm to 1 μm, 1061 parts by weight of aggregate, and 2.4 parts by weight of an AE agent were uniformly kneaded. To make FS concrete. Then, as a result of measuring only hexavalent chromium in the breathing water over time, it was 0.083 ppm after 20 minutes, 0.05 ppm after 40 minutes, 0.037 ppm after 2 hours, and 0.012 ppm after 4 hours. From the above test results, it is particularly effective to use the method of the present invention when constructing structures such as piers, dams, caissons, and wave-dissipating blocks.

【００１３】[0013]

【発明の効果】本発明のように粒径１０μｍ〜５０ｎｍ
の微粒材をセメントに対して１０〜２００重量％使用す
ることによってセメント中に含有するクロムを有効にコ
ンクリート中に封入させることができる。特に本発明は
コンクリート構造物を構築する際に使用することが好ま
しい。According to the present invention, the particle size is 10 μm to 50 nm.
The chromium contained in the cement can be effectively encapsulated in the concrete by using 10 to 200% by weight of the fine particles of the cement with respect to the cement. In particular, the present invention is preferably used when constructing a concrete structure.

───────────────────────────────────────────────────── 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 18:10 Ｃ０４Ｂ 18:10 Ａ 14:36 14:36 14:30 14:30 14:34） 14:34） 111:00 111:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C04B 18:10 C04B 18:10 A 14:36 14:36 14:30 14:30 14:34) 14: 34) 111: 00 111: 00

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】セメント混練の際に、セメントに対し粒径
１０μｍ〜５０ｎｍの微粒材１０〜２００重量％の存在
下に行うことを特徴とするセメントの混練方法。1. A method of kneading cement, wherein kneading of cement is carried out in the presence of 10 to 200% by weight of a fine particle having a particle size of 10 μm to 50 nm with respect to the cement. 【請求項２】粒径１０μｍ〜５０ｎｍの微粒材からなる
セメント添加剤。2. A cement additive comprising fine particles having a particle size of 10 μm to 50 nm. 【請求項３】微粒材が高炉スラグ、製鋼スラグ、フライ
アッシュ、石炭灰、カーボンブラック、磁性流体、ファ
インセラミックである請求項２記載のセメント添加剤。3. The cement additive according to claim 2, wherein the fine particles are blast furnace slag, steelmaking slag, fly ash, coal ash, carbon black, magnetic fluid, and fine ceramic.
JP2000077220A 2000-02-15 2000-02-15 Method for kneading concrete Pending JP2001226159A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000077220A JP2001226159A (en) 2000-02-15 2000-02-15 Method for kneading concrete

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000077220A JP2001226159A (en) 2000-02-15 2000-02-15 Method for kneading concrete

Publications (1)

Publication Number Publication Date
JP2001226159A true JP2001226159A (en) 2001-08-21

Family

ID=18594826

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000077220A Pending JP2001226159A (en) 2000-02-15 2000-02-15 Method for kneading concrete

Country Status (1)

Country Link
JP (1) JP2001226159A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106587685A (en) * 2016-12-15 2017-04-26 上海宝田新型建材有限公司 Compound coal ash admixture for concrete
CN109415257A (en) * 2017-01-17 2019-03-01 住友大阪水泥股份有限公司 The manufacturing method of flying dust, cement composition and flying dust

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106587685A (en) * 2016-12-15 2017-04-26 上海宝田新型建材有限公司 Compound coal ash admixture for concrete
CN109415257A (en) * 2017-01-17 2019-03-01 住友大阪水泥股份有限公司 The manufacturing method of flying dust, cement composition and flying dust
CN109415257B (en) * 2017-01-17 2020-09-01 住友大阪水泥股份有限公司 Fly ash, cement composition, and method for producing fly ash

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