JP2003146715A - Cement admixture, cement composition and cement concrete using the same - Google Patents
Cement admixture, cement composition and cement concrete using the sameInfo
- Publication number
- JP2003146715A JP2003146715A JP2001347246A JP2001347246A JP2003146715A JP 2003146715 A JP2003146715 A JP 2003146715A JP 2001347246 A JP2001347246 A JP 2001347246A JP 2001347246 A JP2001347246 A JP 2001347246A JP 2003146715 A JP2003146715 A JP 2003146715A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- slag
- admixture
- concrete
- sulfur
- 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.)
- Granted
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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/142—Steelmaking slags, converter slags
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/308—Slump-loss preventing agents
-
- 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
- C04B2111/1081—Chromium VI, e.g. for avoiding chromium eczema
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主に、土木・建築
業界において使用されるセメント混和材、セメント組成
物、及びそれを用いたセメントコンクリートに関する。
なお、本発明における部や％は特に規定しない限り質量
基準で示す。また、本発明でいうセメントコンクリート
とは、ペースト、モルタル、及びコンクリートを総称す
るものである。TECHNICAL FIELD The present invention mainly relates to a cement admixture used in the civil engineering and construction industry, a cement composition, and cement concrete using the same.
Parts and% in the present invention are based on mass unless otherwise specified. The cement concrete referred to in the present invention is a general term for paste, mortar, and concrete.
【０００２】[0002]
【従来の技術とその課題】現在、産業副産物である各種
の鉄鋼スラグの有効利用に関して関心が寄せられている
(「鉄鋼スラグの有効利用の現状と今後の課題」、社団
法人日本鉄鋼協会、平成13年参照)。鉄鋼スラグは、プ
ロセスや設備によって様々な組成や性状を有するスラグ
として副生している。例えば、銑鉄を調製するプロセス
で用いる高炉からは高炉スラグが、銑鉄から製鋼するプ
ロセスで用いる溶銑予備処理設備、転炉、及び電気炉か
らは、それぞれ、溶銑予備処理スラグ、転炉スラグ、及
び電気炉スラグが副生する。さらに、高炉スラグには水
砕スラグと徐冷スラグがあり、溶銑予備処理スラグに
は、脱珪スラグ、脱リンスラグ、及び脱硫スラグがあ
り、電気炉スラグにも酸化期スラグと還元期スラグが存
在する。2. Description of the Related Art Currently, there is interest in the effective utilization of various steel slags that are industrial by-products.
(Refer to "Current status of effective utilization of steel slag and future issues", Japan Iron and Steel Institute, 2001). Iron and steel slag is by-produced as slag having various compositions and properties depending on the process and equipment. For example, blast furnace slag from the blast furnace used in the process of preparing pig iron, hot metal pretreatment equipment used in the process of steelmaking from pig iron, converter, and electric furnace, respectively, hot metal pretreatment slag, converter slag, and electric Furnace slag is a byproduct. Further, there are granulated slag and slowly cooled slag in blast furnace slag, desiliconization slag, dephosphorization slag, and desulfurization slag in hot metal pretreatment slag, and electric furnace slag also contains oxidation slag and reduction slag. To do.
【０００３】従来より、高炉より副生する高炉水砕スラ
グや高炉徐冷スラグはコンクリート混和材や路盤材等と
して利用されている。また、転炉スラグもある程度の処
理を施せば路盤材として利用できることも報告されてい
る。しかしながら、前述した鉄鋼スラグと呼ばれるもの
には未だに有効な利用方法が見出されていないものが多
い。そのひとつとして、溶銑の予備処理設備で副生する
脱硫スラグが挙げられる。脱硫スラグは、イオウ分を除
去する工程で副生するスラグであり、他のスラグよりも
イオウ分が多い特徴を有する。したがって、イオウ分を
嫌うセメント原料への脱硫スラグの利用ができないこ
と、また、その他の有効な利用方法も見出されていない
ことから廃棄処分されていることが多い。Conventionally, granulated blast furnace slag produced as a by-product from a blast furnace or slowly cooled blast furnace slag has been used as a concrete admixture or a roadbed material. It is also reported that converter slag can be used as a roadbed material if it is treated to some extent. However, many of the so-called iron and steel slags described above have not yet been found to be effective. One of them is desulfurization slag produced as a by-product in the hot metal pretreatment facility. Desulfurization slag is a slag produced as a by-product in the step of removing sulfur content, and has a characteristic of having a larger sulfur content than other slags. Therefore, desulfurized slag cannot be used as a cement raw material that dislikes sulfur, and since no other effective utilization method has been found, it is often discarded.
【０００４】本発明者は、有効利用方法が見出されてい
ない脱硫スラグを粉末化した脱硫スラグ粉末が優れた性
能を有することを見出し、それを含有するセメント混和
材を用いることにより、多機能なセメントコンクリート
が得られることを知見し、本発明を完成するに至った。The present inventor has found that desulfurized slag powder obtained by pulverizing desulfurized slag for which no effective utilization method has been found has excellent performance, and by using a cement admixture containing the same, a multifunctional product can be obtained. The present inventors have completed the present invention by discovering that various cement concretes can be obtained.
【０００５】[0005]
【課題を解決するための手段】即ち、本発明は、脱硫ス
ラグ粉末を含有してなるセメント混和材であり、脱硫ス
ラグ粉末が非硫酸態イオウとして存在するイオウを0.5
％以上含む該セメント混和材であり、脱硫スラグ粉末の
ブレーン比表面積が4,000cm2/g以上である該セメント混
和材であり、セメントと、該セメント混和材とを含有し
てなるセメント組成物であり、該セメント組成物を用い
てなるセメントコンクリートである。Means for Solving the Problems That is, the present invention is a cement admixture containing desulfurized slag powder, wherein the desulfurized slag powder contains 0.5% sulfur present as non-sulfuric acid sulfur.
% Of the cement admixture, wherein the desulfurized slag powder has a Blaine specific surface area of 4,000 cm 2 / g or more, the cement admixture, and a cement composition containing the cement and the cement admixture. There is a cement concrete using the cement composition.
【０００６】[0006]
【発明の実施の形態】以下、本発明を詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
【０００７】本発明で使用する脱硫スラグとは、溶銑の
予備処理設備で副生するスラグ、いわゆる、溶銑予備処
理スラグのうち、脱硫工程で副生するスラグを総称する
ものであり、特に限定されるものではない。脱硫スラグ
の成分は特に限定されるものではないが、具体的には、
CaO、SiO2、Al2O3、Fe2O3、S、MgO、TiO2、MnO、Na2O、
及びP2O5などが挙げられ、さらにFe2O3以外の状態で存
在するFeを含んでいる。これらの成分割合は、使用する
鉄鉱石の組成や脱硫剤の組成によって大きく異なるため
一義的に決定することはできない。また、化合物として
は、トライカルシウムシリケート3CaO・SiO2、ダイカル
シウムシリケート2CaO・SiO2、ランキナイト3CaO・2Si
O2、及びワラストナイトCaO・SiO2などのカルシウムシリ
ケート、カルシウムフェライト、カルシウムアルミノフ
ェライト、遊離石灰、リューサイト(K2O、Na2O)・Al2O3・
SiO2、スピネルMgO・Al 2O3、マグネタイトFe3O4、並び
に、硫化カルシウムCaSや硫化鉄FeSなどの硫化物等を含
む場合が多いが、化合物組成も化学成分の変動と関連す
るため一義的に決定されるものではない。The desulfurization slag used in the present invention means hot metal
Slag produced as a by-product in the pretreatment facility, so-called hot metal preliminary treatment
Of the physical slag, it is a generic term for the slag produced as a by-product in the desulfurization process.
However, it is not particularly limited. Desulfurization slag
The component of is not particularly limited, but specifically,
CaO, SiO2, Al2O3, Fe2O3, S, MgO, TiO2, MnO, Na2O,
And P2OFiveEtc., and Fe2O3Exists in a state other than
Contains existing Fe. The ratio of these ingredients to use
It greatly depends on the composition of iron ore and the composition of desulfurizing agent.
It cannot be decided unambiguously. Also, as a compound
Is tricalcium silicate 3CaO ・ SiO2, Dical
Cium silicate 2CaO ・ SiO2, Rankinite 3CaO ・ 2Si
O2, And wollastonite CaO ・ SiO2Such as calcium siri
Quate, calcium ferrite, calcium aluminof
Celite, free lime, leucite (K2O, Na2O) ・ Al2O3・
SiO2, Spinel MgO / Al 2O3, Magnetite Fe3OFour, Line
Contains sulfides such as calcium sulfide CaS and iron sulfide FeS.
In many cases, the chemical composition is also related to the variation of chemical composition.
Therefore, it is not uniquely decided.
【０００８】本発明では、脱硫スラグは特に限定される
ものではないが、非硫酸態イオウとして存在するイオウ
(以下、単に非硫酸態イオウという)を0.5％以上含むも
のを用いることが、本発明の効果が顕著であることから
好ましい。非硫酸態イオウが0.5％未満では、本発明の
効果、即ち、六価クロム還元性能やスランプロスの抑制
効果が充分に得られない場合がある。非硫酸態イオウ
は、0.5％以上が好ましく、0.7％以上がより好ましく、
0.9％以上が最も好ましい。非硫酸態イオウ量は、全イ
オウ量、単体イオウ量、硫化物態イオウ量、チオ硫酸態
イオウ量、及び硫酸態イオウ(三酸化イオウ)量を山口と
小野の方法により定量することによって、また、硫酸態
イオウ量(三酸化イオウ)と硫化物イオウ量については、
JIS R 5202に定められた方法により定量することによっ
ても求めることができる(「高炉スラグ中硫黄の状態分
析」、山口直治、小野昭紘：製鉄研究、第301号、pp.37
-40、1980参照)。In the present invention, the desulfurization slag is not particularly limited, but sulfur existing as non-sulfate sulfur is used.
It is preferable to use one containing 0.5% or more (hereinafter, simply referred to as non-sulfate sulfur) because the effect of the present invention is remarkable. When the amount of non-sulfuric acid sulfur is less than 0.5%, the effect of the present invention, that is, the hexavalent chromium reduction performance and the effect of suppressing slump loss may not be sufficiently obtained. Non-sulfate sulfur is preferably 0.5% or more, more preferably 0.7% or more,
0.9% or more is the most preferable. The amount of non-sulfate is determined by quantifying the total amount of sulfur, the amount of elemental sulfur, the amount of sulfide, the amount of thiosulfate, and the amount of sulfate (sulfur trioxide) by the method of Yamaguchi and Ono. For the amount of sulfated sulfur (sulfur trioxide) and the amount of sulfide sulfur,
It can also be obtained by quantifying according to the method specified in JIS R 5202 ("Analysis of the state of sulfur in blast furnace slag", Naoji Yamaguchi, Akihiro Ono: Steelmaking Research, No. 301, pp.37.
-40, 1980).
【０００９】脱硫スラグのブレーン比表面積(以下、ブ
レーン値という)は特に限定されるものではないが、3,0
00cm2/g以上が好ましく、4,000〜8000cm2/gがより好ま
しく、5,000〜8,000cm2/gが最も好ましい。3,000cm2/g
未満では本発明の効果、即ち、六価クロムの還元性能が
充分に得られない場合があり、また、材料分離抵抗性も
期待できない。一方、8000cm2/gを超えるように粉砕す
るには、粉砕動力が大きくなり不経済であり、また、脱
硫スラグが風化しやすくなって、品質の経時的な劣化が
大きくなる場合がある。Although the Blaine specific surface area (hereinafter referred to as Blaine value) of the desulfurized slag is not particularly limited,
00 cm 2 / g or more is preferable, 4,000 to 8000 cm 2 / g is more preferable, and 5,000 to 8,000 cm 2 / g is most preferable. 3,000 cm 2 / g
If it is less than the above range, the effect of the present invention, that is, the reduction performance of hexavalent chromium may not be sufficiently obtained, and resistance to material separation cannot be expected. On the other hand, in order to pulverize it to exceed 8000 cm 2 / g, the pulverization power becomes large and it is uneconomical, and the desulfurization slag may be easily weathered, and the deterioration of quality with time may become large.
【００１０】本発明のセメント混和材(以下、本混和材
という)の使用量は特に限定されるものではないが、通
常、セメントと本混和材からなるセメント組成物100部
中、３〜60部が好ましく、５〜50部がより好ましい。３
部未満では本発明の効果が充分に得られない場合があ
り、60部を超えて使用すると強度発現性が悪くなる場合
がある。The amount of the cement admixture of the present invention (hereinafter referred to as the present admixture) used is not particularly limited, but usually 3 to 60 parts in 100 parts of the cement composition consisting of cement and the present admixture. Is preferred, and 5 to 50 parts is more preferred. Three
If it is less than 60 parts, the effect of the present invention may not be sufficiently obtained, and if it exceeds 60 parts, the strength development may be deteriorated.
【００１１】本発明で使用するセメントとしては、普
通、早強、超早強、低熱、及び中庸熱等の各種ポルトラ
ンドセメント、これらポルトランドセメントに、高炉ス
ラグ、フライアッシュ、又はシリカを混合した各種混合
セメント、石灰石粉末等を混合したフィラーセメント、
並びに、産業廃棄物利用型セメント、いわゆるエコセメ
ントなどが挙げられ、これらのうちの一種又は二種以上
の使用が可能である。As the cement used in the present invention, various kinds of portland cements such as normal, early strength, ultra-early strength, low heat, and moderate heat, and various mixtures of these portland cements mixed with blast furnace slag, fly ash, or silica. Filler cement mixed with cement, limestone powder, etc.,
In addition, industrial waste utilization type cement, so-called ecocement and the like can be mentioned, and one or more of these can be used.
【００１２】本発明のセメント組成物はそれぞれの材料
を施工時に混合してもよいし、あらかじめ一部を、ある
いは全部を混合しておいても差し支えない。例えば、高
炉徐冷スラグとセメントクリンカーとセッコウを別々に
粉砕して混合しても良いし、これらの一部をあるいは全
部を混合粉砕して製造してもよい。本発明のセメント組
成物の粒度は、使用する目的・用途に依存するため特に
限定されるものではないが、通常、ブレーン値で3,000
〜8,000cm2/gが好ましく、4,000〜6,000cm2/gがより好
ましい。3,000cm2/g未満では強度発現性が充分に得られ
ない場合があり、8,000cm2/gを超えると作業性が悪くな
る場合がある。In the cement composition of the present invention, the respective materials may be mixed at the time of construction, or some or all of them may be mixed in advance. For example, blast furnace slowly cooled slag, cement clinker and gypsum may be separately crushed and mixed, or a part or all of these may be mixed and crushed for production. The particle size of the cement composition of the present invention is not particularly limited because it depends on the purpose and application to be used, but it is usually 3,000 in terms of Blaine value.
~8,000cm 2 / g are preferred, 4,000~6,000cm 2 / g is more preferable. If it is less than 3,000 cm 2 / g, sufficient strength development may not be obtained, and if it exceeds 8,000 cm 2 / g, workability may deteriorate.
【００１３】本発明では、セメント、本混和材、砂や砂
利等の骨材の他に、従来セメントコンクリートに用いら
れてきた高炉水砕スラグ粉末、石灰石粉末、フライアッ
シュ、及びシリカフュームなどの混和材料、減水剤、Ａ
Ｅ減水剤、高性能減水剤、高性能ＡＥ減水剤、消泡剤、
増粘剤、防錆剤、防凍剤、収縮低減剤、高分子エマルジ
ョン、凝結調整剤、ベントナイトなどの粘土鉱物、並び
に、ハイドロタルサイトなどのアニオン交換体等のうち
の一種又は二種以上を、本発明の目的を実質的に阻害し
ない範囲で使用することが可能である。In the present invention, in addition to cement, the present admixture, aggregates such as sand and gravel, admixture materials such as granulated blast furnace slag powder, limestone powder, fly ash, and silica fume which have been conventionally used for cement concrete. , Water reducing agent, A
E water reducing agent, high performance water reducing agent, high performance AE water reducing agent, defoaming agent,
Thickeners, rust preventives, antifreeze agents, shrinkage reducers, polymer emulsions, setting regulators, clay minerals such as bentonite, and one or more of anion exchangers such as hydrotalcite, It can be used within a range not substantially impairing the object of the present invention.
【００１４】なお、本発明のセメントコンクリートに
は、施工の良否の影響を受けない高流動コンクリートも
含まれる。高流動コンクリートは、コンクリートの広が
りで表されるスランプフロー値で、650±50mmの範囲で
調製されるのが一般的である。The cement concrete of the present invention includes high-fluidity concrete that is not affected by the quality of construction. High-fluidity concrete has a slump flow value expressed by the spread of concrete, and is generally prepared in the range of 650 ± 50 mm.
【００１５】本発明において、各材料の混合方法は特に
限定されるものではなく、それぞれの材料を施工時に混
合しても良いし、あらかじめ一部を、あるいは全部を混
合しておいても差し支えない。混合装置としては、既存
のいかなる装置も使用可能であり、例えば、傾胴ミキ
サ、オムニミキサ、ヘンシェルミキサ、Ｖ型ミキサ、及
びナウタミキサなどの使用が可能である。In the present invention, the method of mixing the respective materials is not particularly limited, and the respective materials may be mixed at the time of construction, or part or all of them may be mixed in advance. . As the mixing device, any existing device can be used, and for example, a tilting barrel mixer, an omni mixer, a Henschel mixer, a V-type mixer, and a Nauta mixer can be used.
【００１６】[0016]
【実施例】以下、本発明を実験例に基づいてさらに説明
する。The present invention will be further described below based on experimental examples.
【００１７】実験例１
各種脱硫スラグ微粉末(スラグ)を本混和材として使用
し、表１に示すような単位セメント組成物量350kg/m3、
単位水量175kg/m3、s/a=46％、及び空気量4.5±1.5％の
コンクリートを調製し、スランプロスを測定した。ま
た、本混和材の六価クロム低減能力を評価するため、六
価クロム残存濃度を測定した。比較のために、高炉水砕
スラグや、溶銑予備処理スラグのうちの脱珪スラグにつ
いても同様の実験を行った。結果を表１に併記する。な
お、コンクリートのスランプ値が18±1.5cmとなるよう
に高性能ＡＥ減水剤を使用した。Experimental Example 1 Using various desulfurized slag fine powder (slag) as the main admixture, the unit cement composition amount as shown in Table 1 is 350 kg / m 3 ,
Concrete having a unit water amount of 175 kg / m 3 , s / a = 46%, and an air amount of 4.5 ± 1.5% was prepared, and the slump loss was measured. Further, in order to evaluate the hexavalent chromium reducing ability of the present admixture, the hexavalent chromium residual concentration was measured. For comparison, the same experiment was conducted for granulated blast furnace slag and desiliconized slag of the hot metal pretreatment slag. The results are also shown in Table 1. A high-performance AE water reducing agent was used so that the slump value of concrete would be 18 ± 1.5 cm.
【００１８】 ＜使用材料＞ セメント ：普通ポルトランドセメント、電気化学工業社製、比重3.15 スラグＡ ：脱硫スラグ、ブレーン値3,000cm2/g、非硫酸態イオウ0.9％ スラグＢ ：脱硫スラグ、ブレーン値4,000cm2/g、非硫酸態イオウ0.9％ スラグＣ ：脱硫スラグ、ブレーン値5,000cm2/g、非硫酸態イオウ0.9％ スラグＤ ：脱硫スラグ、ブレーン値6,000cm2/g、非硫酸態イオウ0.9％ スラグＥ ：脱硫スラグ、ブレーン値8,000cm2/g、非硫酸態イオウ0.9％ スラグＦ ：スラグＤを水に浸漬してエイジングし、非硫酸態イオウを0.7％に したもの、ブレーン値6,000cm2/g スラグＧ ：スラグＤを水に浸漬してエイジングし、非硫酸態イオウを0.5％に したもの、ブレーン値6,000cm2/g スラグＨ ：高炉水砕スラグ、ブレーン値6,000cm2/g、非硫酸態イオウ0.6％ スラグＩ ：脱珪スラグ、ブレーン値6,000cm2/g、非硫酸態イオウ0.04％ 水 ：水道水 砂 ：新潟県姫川産、比重2.62 砂利 ：新潟県姫川産、砕石、比重2.64 高性能ＡＥ減水剤：ポリカルボン酸系、市販品<Materials used> Cement: ordinary Portland cement, manufactured by Denki Kagaku Kogyo, specific gravity 3.15 Slag A: desulfurization slag, Blaine value 3,000 cm 2 / g, non-sulfuric acid 0.9% slag B: desulfurization slag, Blaine value 4,000 cm 2 / g, non-sulfuric acid sulfur 0.9% Slag C: desulfurized slag, Blaine value 5,000 cm 2 / g, non-sulfuric acid sulfur 0.9% Slag D: desulfurized slag, Blaine value 6,000 cm 2 / g, non-sulfuric acid sulfur 0.9 % Slag E: desulfurized slag, Blaine value 8,000 cm 2 / g, non-sulfuric acid sulfur 0.9% Slag F: Slag D immersed in water for aging to 0.7% non-sulfuric acid sulfur, Blaine value 6,000 cm 2 / g Slag G: Slag D immersed in water and aged to make 0.5% of non-sulfuric acid sulfur, Blaine value 6,000 cm 2 / g Slag H: Granulated blast furnace slag, Blaine value 6,000 cm 2 / g , Non-sulfuric acid sulfur 0.6% Slag I Silica slag, Blaine value 6,000 cm 2 / g, non-sulfate sulfur 0.04% Water: Tap water Sand: Niigata prefecture Himekawa product, specific gravity 2.62 Gravel: Niigata prefecture Himekawa product, crushed stone, specific gravity 2.64 High performance AE water reducing agent: polycarboxylic acid System, commercial product
【００１９】＜測定方法＞
スランプロス：JIS A 1101に準じてスランプ値を測定
し、練り上がりのスランプ値から90分経過後のスランプ
値を差し引いて、スランプロス値とした。
六価クロム残存濃度：セメント混和材の六価クロム低減
能力の評価、六価クロム標準溶液を希釈して、六価クロ
ム濃度が100mg/lの溶液を調製し、この六価クロム溶液5
0ccに各セメント混和材10ｇを入れて攪拌し、７日後に
固液分離して液相中の六価クロム残存濃度を測定するこ
とによって評価した。ただし、六価クロムの残存濃度
は、JIS K 0102に準じ、ＩＣＰ発光分光分析法により測
定した。<Measurement method> Slump loss: The slump value was measured according to JIS A 1101, and the slump value after 90 minutes was subtracted from the slump value after kneading to obtain a slump loss value. Hexavalent chromium residual concentration: Evaluation of the hexavalent chromium reducing ability of the cement admixture, diluting the hexavalent chromium standard solution to prepare a solution with a hexavalent chromium concentration of 100 mg / l.
10 g of each cement admixture was placed in 0 cc, stirred, and after 7 days, solid-liquid separation was performed and the residual concentration of hexavalent chromium in the liquid phase was measured to evaluate. However, the residual concentration of hexavalent chromium was measured by ICP emission spectroscopy according to JIS K 0102.
【００２０】[0020]
【表１】 [Table 1]
【００２１】実験例２
セメントと本混和材からなるセメント組成物100部中、
表２示すスラグＤを使用し、スランプロスを測定したこ
と以外は、実験例１と同様に行った。結果を表２に併記
する。Experimental Example 2 In 100 parts of a cement composition comprising cement and the present admixture,
The same procedure as in Experimental Example 1 was performed except that the slump loss was measured using the slag D shown in Table 2. The results are also shown in Table 2.
【００２２】[0022]
【表２】 [Table 2]
【００２３】[0023]
【発明の効果】本発明のセメント混和材は六価クロムの
低減能力を有し、これを使用することにより、スランプ
ロスが小さいコンクリートとすることができる。また、
脱硫スラグの有効利用にもなるなどの効果を奏する。EFFECTS OF THE INVENTION The cement admixture of the present invention has the ability to reduce hexavalent chromium, and by using this, concrete with a small slump loss can be obtained. Also,
It also has the effect of effectively using desulfurized slag.
Claims (5)
混和材。1. A cement admixture containing desulfurized slag powder.
存在するイオウを0.5％以上含むことを特徴とする請求
項１に記載のセメント混和材。2. The cement admixture according to claim 1, wherein the desulfurized slag powder contains 0.5% or more of sulfur present as non-sulfuric acid sulfur.
000cm2/g以上であることを特徴とする請求項１又は２に
記載のセメント混和材。3. The desulfurized slag powder has a Blaine specific surface area of 4,
The cement admixture according to claim 1 or 2, wherein the cement admixture is 000 cm 2 / g or more.
に記載のセメント混和材とを含有してなるセメント組成
物。4. A cement composition comprising cement and the cement admixture according to claim 1.
てなるセメントコンクリート。5. Cement concrete comprising the cement composition according to claim 4.
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| JP2001347246A JP3983033B2 (en) | 2001-11-13 | 2001-11-13 | Cement admixture, cement composition, and cement concrete using the same |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101016877B1 (en) * | 2008-09-17 | 2011-02-22 | 재단법인 포항산업과학연구원 | High-Performance Addtive for Concrete Made from Desulfured Slag and Manufacturing Method Thereof |
| KR101366576B1 (en) * | 2011-12-08 | 2014-02-27 | 재단법인 포항산업과학연구원 | Cement admixture and cement mixture having the same |
| KR101482382B1 (en) | 2013-03-08 | 2015-01-14 | 주식회사 포스코 | Low-heat cement composition including desulfurization slag and blast furnace slag |
| CN110395918A (en) * | 2019-09-03 | 2019-11-01 | 广东华欣环保科技有限公司 | A kind of processing method of sintering flue gas desulfurization slag |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101223888B1 (en) * | 2010-12-27 | 2013-01-17 | 재단법인 포항산업과학연구원 | Blast furnace slag powder composition improved activity |
| KR101353626B1 (en) * | 2011-08-26 | 2014-01-21 | 재단법인 포항산업과학연구원 | Non―sintering slag cement composite using byproduct of iron and steel |
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2001
- 2001-11-13 JP JP2001347246A patent/JP3983033B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101016877B1 (en) * | 2008-09-17 | 2011-02-22 | 재단법인 포항산업과학연구원 | High-Performance Addtive for Concrete Made from Desulfured Slag and Manufacturing Method Thereof |
| KR101366576B1 (en) * | 2011-12-08 | 2014-02-27 | 재단법인 포항산업과학연구원 | Cement admixture and cement mixture having the same |
| KR101482382B1 (en) | 2013-03-08 | 2015-01-14 | 주식회사 포스코 | Low-heat cement composition including desulfurization slag and blast furnace slag |
| CN110395918A (en) * | 2019-09-03 | 2019-11-01 | 广东华欣环保科技有限公司 | A kind of processing method of sintering flue gas desulfurization slag |
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| Publication number | Publication date |
|---|---|
| JP3983033B2 (en) | 2007-09-26 |
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