JP2003306359A - Cement composition and hydrated hardened body - Google Patents
Cement composition and hydrated hardened bodyInfo
- Publication number
- JP2003306359A JP2003306359A JP2002114474A JP2002114474A JP2003306359A JP 2003306359 A JP2003306359 A JP 2003306359A JP 2002114474 A JP2002114474 A JP 2002114474A JP 2002114474 A JP2002114474 A JP 2002114474A JP 2003306359 A JP2003306359 A JP 2003306359A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- cement
- steelmaking slag
- cement composition
- aggregate
- 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
Links
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- 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
- 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・建築分
野で使用されるコンクリートやモルタル等の水和硬化体
に使用されるセメント組成物及びこのセメント組成物を
用いた水和硬化体に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement composition used for a hydrated hardened body such as concrete or mortar mainly used in the field of civil engineering and construction, and a hydrated hardened body using this cement composition. .
【０００２】[0002]
【従来の技術】コンクリートやモルタル等の水和硬化体
の結合材として用いられるセメントは、一般にポルトラ
ンドセメントと混合セメントに大別される。混合セメン
トは、ポルトランドセメントに高炉水砕スラグ、フライ
アッシュ、シリカヒュームの１種以上を混合したもので
あり、ダム、河川、港湾工事等の水中または海中の工事
や構造物に利用されることが多い。高炉水砕スラグ等は
セメントの水和反応で多量に生ずる水酸化カルシウムと
反応し硬化する性質（潜在水硬性、ポゾラン性）があ
り、用途に応じて水和熱の低減効果、長期強度向上、耐
浸食性向上、耐熱性向上、水密性向上、流動性向上など
が期待できる。混合セメントに用いるポルトランドセメ
ントには、通常は普通ポルトランドセメントを用いる
が、低熱ポルトランドセメント等の他のポルトランドセ
メントを用いて混合セメントを製造する場合もある。2. Description of the Related Art Cement used as a binder for hydrated hardened materials such as concrete and mortar is generally classified into Portland cement and mixed cement. Mixed cement is Portland cement mixed with one or more of granulated blast furnace slag, fly ash, and silica fume, and may be used for underwater or underwater construction such as dam, river, and harbor construction, and structures. Many. Granulated blast furnace slag has the property of reacting with calcium hydroxide that is produced in a large amount by the hydration reaction of cement and hardening (latent hydraulic property, pozzolanic property). Depending on the application, the effect of reducing the heat of hydration, improving long-term strength, It can be expected to improve erosion resistance, heat resistance, watertightness and fluidity. As the Portland cement used for the mixed cement, normally Portland cement is usually used, but there are cases where the mixed cement is produced by using other Portland cement such as low heat Portland cement.
【０００３】高炉水砕スラグ、フライアッシュ、シリカ
ヒューム等は混合セメントの材料として使用する他に、
微細粒子としての機能に着目して混和材として生コンク
リート混練時に加えて使用する場合もある。この場合
も、上記の混合セメントと同等の効果が期待できる。Granulated blast furnace slag, fly ash, silica fume, etc. are used as materials for mixed cement,
Focusing on the function as fine particles, it may be used as an admixture in addition to fresh concrete during kneading. Also in this case, the same effect as the above-mentioned mixed cement can be expected.
【０００４】高炉水砕スラグ微粉末を混合した混合セメ
ントである高炉セメントを用いたコンクリートは組織が
緻密で水密性に優れ、海水に対する抵抗性に優れてい
る。しかし、長期の強度は普通ポルトランドセメントと
を用いた場合と同等かそれ以上であるが、初期の強度が
普通ポルトランドセメントを用いた場合より低いという
短所がある。Concrete using blast furnace cement, which is a mixed cement mixed with granulated blast furnace granulated slag, has a dense structure, is excellent in watertightness, and is excellent in resistance to seawater. However, although the long-term strength is equal to or higher than that when using ordinary Portland cement, there is a disadvantage that the initial strength is lower than when using ordinary Portland cement.
【０００５】一方、高炉スラグ、フライアッシュ等を混
合したセメントを用いたコンクリート、またはセメント
に高炉スラグ、フライアッシュなどの混和材を加えて製
造したコンクリートには、中性化速度が大きくなる問題
がある。セメントの水和反応により多量の水酸化カルシ
ウムが生ずるので、コンクリートの中はアルカリ性を示
し、そのアルカリ性が鉄筋を酸化から保護しているが、
この水酸化カルシウムが高炉スラグ等のポゾラン性を有
する物質と反応して失われて中性化すると、鉄筋が発錆
しやすくなり、さらに鉄筋の構造強度が低下するととも
に発錆による体積膨張のためにひび割れが発生しやすく
なるという問題である。中性化の防止のために、減水剤
の使用により水セメント比（セメントに対する水の使用
量）を小さくして水分が少なく緻密なコンクリート構造
にする方法、透気性の小さい仕上げ材でコンクリート表
面を保護する方法などがある。しかしこれらの方法は、
炭酸ガスの浸透速度を低下させて中性化を防止しようと
するものであり、コンクリート中に浸透した炭酸ガスに
よりアルカリ性が低下して起こる中性化には効果がある
が、元のコンクリートのアルカリ性を高めようとするも
のではない。したがって普通ポルトランドセメントなど
と比べて、もともとのアルカリ性が低い混合セメントの
場合にはさらにアルカリ性を高めるような方策が望まし
い。On the other hand, the concrete using cement mixed with blast furnace slag, fly ash or the like, or the concrete produced by adding admixture such as blast furnace slag or fly ash to cement has a problem that the rate of neutralization increases. is there. Since a large amount of calcium hydroxide is generated by the hydration reaction of cement, the concrete shows alkalinity, and the alkalinity protects the reinforcing bar from oxidation,
When this calcium hydroxide reacts with a substance having pozzolanic properties such as blast furnace slag and is lost and becomes neutral, the reinforcing bars easily rust, and further the structural strength of the reinforcing bars decreases and the volume expansion due to rusting causes The problem is that cracks tend to occur. In order to prevent neutralization, a water-reducing agent is used to reduce the water-cement ratio (the amount of water used for cement) to create a dense concrete structure with low water content, and a concrete surface with a low-permeability finishing material. There are ways to protect. But these methods
It is intended to prevent carbonation by reducing the permeation rate of carbon dioxide, and it is effective for carbonation caused by carbon dioxide permeating into concrete to reduce its alkalinity. It is not the one to try to raise. Therefore, compared to ordinary Portland cement and the like, it is desirable to take measures to further increase alkalinity in the case of mixed cement which originally has low alkalinity.
【０００６】以上のような混合セメントの初期強度と中
性化の問題を解決する手段として、特開平９−５２７４
５号公報にはCaOとCaF2を熱処理した配合物を混合セメ
ントの刺激剤（混和材料）として用いる方法が開示され
ている。As means for solving the problems of the initial strength and neutralization of the mixed cement as described above, JP-A-9-5274 is used.
Japanese Unexamined Patent Publication (Kokai) No. 5 discloses a method of using a mixture obtained by heat treating CaO and CaF 2 as a stimulant (mixing material) for mixed cement.
【０００７】[0007]
【発明が解決しようとする課題】しかし、特開平９−５
２７４５号公報で開示されている方法は、フッ化カルシ
ウムにより中性化を抑制するものであり、天然資源であ
る石灰石、消石灰に加えてホタル石や工業副産物のフッ
化カルシウムを使用する必要があり、しかもこれらをあ
らかじめ熱処理しなければならないのでコストが高い。However, Japanese Patent Application Laid-Open No. 9-5.
The method disclosed in Japanese Patent No. 2745 suppresses neutralization with calcium fluoride, and it is necessary to use fluorite and an industrial by-product calcium fluoride in addition to limestone and slaked lime which are natural resources. Moreover, since these must be heat-treated in advance, the cost is high.
【０００８】したがって本発明の目的は、このような従
来の混合セメントを用いた場合の問題を解決し、初期強
度が普通ポルトランドセメントを結合材に用いる場合に
近く、かつ耐腐食性に優れたコンクリート等の水和硬化
体を製造する際の結合材として好適なセメント組成物を
簡便かつ安価に提供することにある。Therefore, an object of the present invention is to solve the problems in the case of using such a conventional mixed cement, to obtain concrete having an initial strength close to that of ordinary Portland cement as a binder and excellent in corrosion resistance. Another object of the present invention is to provide a cement composition, which is suitable as a binder when producing a hydrated cured product such as, simply and at low cost.
【０００９】また本発明の他の目的は、初期強度が普通
ポルトランドセメントを結合材に用いる場合に近く、か
つ耐腐食性に優れた水和硬化体を提供することにある。Another object of the present invention is to provide a hydrated cured product which has an initial strength close to that when ordinary Portland cement is used as a binder and is excellent in corrosion resistance.
【００１０】[0010]
【課題を解決するための手段】このような課題を解決す
るための本発明の特徴は以下の通りである。The features of the present invention for solving the above problems are as follows.
【００１１】（１）混合セメントにアルカリ刺激剤とし
て製鋼スラグを添加したことを特徴とするセメント組成
物。(1) A cement composition characterized in that steelmaking slag is added as an alkali stimulant to the mixed cement.
【００１２】（２）混合セメントが、ポルトランドセメ
ントに混和材として高炉水砕スラグ、フライアッシュ、
シリカヒュームの中から選ばれる１種以上を混合したセ
メントであることを特徴とする、（１）に記載のセメン
ト組成物。(2) The mixed cement is a mixture of Portland cement and granulated blast furnace slag, fly ash, as an admixture.
The cement composition as described in (1), which is a cement in which one or more kinds selected from silica fume are mixed.
【００１３】（３）製鋼スラグの一部又は全部が溶銑脱
硫スラグであることを特徴とする（１）または（２）に
記載のセメント組成物。(3) The cement composition as described in (1) or (2), wherein a part or all of the steelmaking slag is hot metal desulfurization slag.
【００１４】（４）製鋼スラグが、地金除去処理後の酸
化カルシウムの含有量が５０mass％以上の製鋼スラグで
あることを特徴とする（１）または（２）に記載のセメ
ント組成物。(4) The cement composition as described in (1) or (2), wherein the steelmaking slag is a steelmaking slag having a calcium oxide content of 50 mass% or more after the metal removal treatment.
【００１５】（５）製鋼スラグがエージング処理を経た
製鋼スラグであることを特徴とする（１）ないし（４）
のいずれかに記載のセメント組成物。(5) The steelmaking slag is a steelmaking slag that has been subjected to an aging treatment (1) to (4)
The cement composition according to any one of 1.
【００１６】（６）エージング処理が製鋼スラグを常温
にて１日以上湿空中又は水中におく処理であることを特
徴とする（５）に記載のセメント組成物。(6) The cement composition according to (5), characterized in that the aging treatment is a treatment for leaving the steelmaking slag at room temperature for 1 day or more in moist air or water.
【００１７】（７）骨材と、（１）ないし（６）のいず
れかに記載のセメント組成物を結合材として含有するこ
とを特徴とする水和硬化体。(7) A hydrated cured product comprising an aggregate and the cement composition according to any one of (1) to (6) as a binder.
【００１８】（８）骨材の一部又は全部が製鋼スラグか
らなることを特徴とする（７）に記載の水和硬化体。(8) The hydrated product according to (7), characterized in that a part or all of the aggregate is made of steelmaking slag.
【００１９】（９）製鋼スラグとして、骨材と結合材の
両方を含む粒度分布を有するスラグを用いることを特徴
とする（７）または（８）に記載の水和硬化体。(9) The hydrated product according to (7) or (8), characterized in that a slag having a particle size distribution containing both an aggregate and a binder is used as the steelmaking slag.
【００２０】（１０）製鋼スラグとして、粒径５ｍｍ以
下が８５mass％以上、粒径０．０７５ｍｍ未満が１０ma
ss％以上の粒度分布を有するスラグを用いることを特徴
とする（９）に記載の水和硬化体。(10) As a steelmaking slag, a particle size of 5 mm or less is 85 mass% or more, and a particle size of less than 0.075 mm is 10 ma.
The hydrated product according to (9), characterized in that a slag having a particle size distribution of ss% or more is used.
【００２１】[0021]
【発明の実施の形態】本発明者等は混合セメントのアル
カリ刺激不足を製鋼スラグの添加で補うことにより中性
化を抑制し、同時に初期強度も改善されることを見出し
て、本発明を完成した。本発明のセメント組成物は、混
合セメントにアルカリ刺激剤として製鋼スラグを添加し
たものであり、製鋼スラグの中でも特に溶銑脱硫スラグ
が好ましく、さらに製鋼スラグを予めエージング処理す
ることが効果的である。また本発明の水和硬化体は、骨
材と、結合材として前記のセメント組成物である混合セ
メントとアルカリ刺激剤としての製鋼スラグとを含有す
るものである。また骨材としても製鋼スラグを用いると
効果的である。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have completed the present invention by finding that neutralization is suppressed and the initial strength is also improved by supplementing the insufficient alkali stimulation of mixed cement with the addition of steelmaking slag. did. The cement composition of the present invention is a mixture of cement and steelmaking slag added as an alkali stimulant. Among the steelmaking slags, hot metal desulfurization slag is particularly preferable, and it is effective to pre-age the steelmaking slag. Further, the hydrated cured product of the present invention contains an aggregate, a mixed cement which is the above-mentioned cement composition as a binder, and a steelmaking slag as an alkali stimulant. It is also effective to use steelmaking slag as the aggregate.
【００２２】まず、本発明のセメント組成物に用いる混
合セメントについて説明する。本発明で用いる混合セメ
ントは、普通ポルトランドセメント、低熱ポルトランド
セメント等のポルトランドセメントに高炉水砕スラグ、
フライアッシュ、シリカヒューム、石膏の１種以上を混
合したものであり、高炉セメント、フライアッシュセメ
ント等と呼ばれるものである。First, the mixed cement used in the cement composition of the present invention will be described. The mixed cement used in the present invention is ordinary Portland cement, Portland cement such as low heat Portland cement, blast furnace granulated slag,
It is a mixture of one or more of fly ash, silica fume, and gypsum, and is called blast furnace cement, fly ash cement or the like.
【００２３】本発明は上記の混合セメントに、アルカリ
刺激剤として製鋼スラグを加えることを特徴とする。製
鋼スラグは鉄鋼製造プロセスにおいて生じる副生成物で
あり、同プロセスにおいて大量に生成し且つ非常に安価
な材料である。この製鋼スラグは、溶銑などを溶鋼に精
錬するための種々の工程で発生し、例えば、脱炭スラ
グ、溶銑脱燐スラグ、溶銑脱硫スラグ、溶銑脱珪スラ
グ、取鍋精錬スラグ、電気炉製鋼スラグなどがある。製
鋼スラグの化学成分はスラグが生成する精錬工程により
ある程度の差はあるが、主な化学成分は酸化カルシウム
（ＣａＯ）、二酸化珪素、酸化アルミニウム、鉄などで
ある。ＣａＯは精錬時に使用されるもので、ＣａＯの一
部が未反応の状態で残存している。The present invention is characterized in that steelmaking slag is added as an alkali stimulant to the above-mentioned mixed cement. Steelmaking slag is a by-product generated in a steel manufacturing process, and is a very inexpensive material that is produced in a large amount in the process. This steelmaking slag is generated in various processes for refining molten pig iron and the like into molten steel. and so on. The chemical composition of steelmaking slag varies to some extent depending on the refining process in which the slag is produced, but the main chemical composition is calcium oxide (CaO), silicon dioxide, aluminum oxide, iron and the like. CaO is used during refining, and part of CaO remains in an unreacted state.
【００２４】混合セメントに上記の製鋼スラグを加えた
セメント組成物に水と骨材とを加えてコンクリート、モ
ルタル等を製造する際に、製鋼スラグ中の未反応のＣａ
Ｏが水分と接触することにより水和反応を起こして水酸
化カルシウムを形成する。この水酸化カルシウムにより
コンクリートがアルカリ性となり、耐腐食性が向上す
る。従って製鋼スラグのなかでもＣａＯ含有量が多いス
ラグほどアルカリ刺激剤として好適である。また製鋼ス
ラグの添加により初期強度も普通ポルトランドセメント
に近い程度にまで向上する。初期強度が向上する理由を
高炉セメントを例として説明する。高炉セメント中の高
炉スラグは、ポルトランドセメントの水和反応により生
成する水酸化カルシウムからアルカリ刺激を受けて水和
する。また、その際に水酸化カルシウムを生成水和物に
取り込み、消費する。高炉セメントに製鋼スラグを加え
ることにより、水酸化カルシウムが供給されるので、ア
ルカリ刺激による高炉スラグの水和が促進される。従っ
て、高炉セメントにおける高炉スラグ置換率が高いほ
ど、水和促進による初期強度向上の効果が現れやすい。
さらに、後述するように、エトリンガイトの生成も初期
強度向上に寄与していると考えられる。When water and aggregate are added to a cement composition prepared by adding the above steelmaking slag to mixed cement to produce concrete, mortar, etc., unreacted Ca in the steelmaking slag
The contact of O with water causes a hydration reaction to form calcium hydroxide. This calcium hydroxide makes the concrete alkaline and improves the corrosion resistance. Therefore, among the steelmaking slags, the slag having a higher CaO content is more suitable as the alkali stimulant. In addition, the addition of steelmaking slag improves the initial strength to a level close to that of ordinary Portland cement. The reason why the initial strength is improved will be described by taking blast furnace cement as an example. The blast furnace slag in the blast furnace cement is hydrated by being stimulated with alkali from calcium hydroxide produced by the hydration reaction of Portland cement. Further, at that time, calcium hydroxide is incorporated into the produced hydrate and consumed. Since calcium hydroxide is supplied by adding the steelmaking slag to the blast furnace cement, hydration of the blast furnace slag due to alkali stimulation is promoted. Therefore, the higher the blast furnace slag substitution ratio in the blast furnace cement, the more easily the effect of improving the initial strength by promoting hydration appears.
Furthermore, as will be described later, it is considered that the formation of ettringite also contributes to the improvement of the initial strength.
【００２５】製鋼スラグの添加量は、混合セメント中の
高炉水砕スラグ、フライアッシュ、シリカヒューム、石
膏の１種以上の質量に対する割合で２〜２０mass%程度
であることが好ましい。製鋼スラグを添加すれば効果が
あるが、２mass%未満ではアルカリ刺激剤としての作用
が十分ではない。一方で２０mass%を超えると膨張によ
り強度が低下しやすい。The amount of the steelmaking slag added is preferably about 2 to 20 mass% with respect to the mass of one or more of granulated blast furnace slag, fly ash, silica fume and gypsum in the mixed cement. Addition of steelmaking slag is effective, but if it is less than 2 mass%, the action as an alkali stimulant is not sufficient. On the other hand, if it exceeds 20 mass%, the strength tends to decrease due to expansion.
【００２６】本発明において、混合セメントの替わりに
ポルトランドセメントを用いて、ポルトランドセメント
に対して、例えば施工時に混和材として高炉水砕スラ
グ、フライアッシュ、シリカヒューム、石膏の１種以上
を配合する場合も、実質的に混合セメントを用いている
ので本発明のセメント組成物に含まれる。この場合も製
鋼スラグの添加量は、混和材としての高炉水砕スラグ、
フライアッシュ、シリカヒューム、石膏の１種以上の質
量に対する割合で２〜２０mass%程度であることが好ま
しい。In the present invention, when Portland cement is used in place of the mixed cement and one or more kinds of granulated blast furnace slag, fly ash, silica fume and gypsum are blended with Portland cement as an admixture at the time of construction, for example. Also, since substantially mixed cement is used, it is included in the cement composition of the present invention. Also in this case, the amount of steelmaking slag added is the granulated blast furnace slag as an admixture,
It is preferable that the ratio to the mass of at least one of fly ash, silica fume, and gypsum is about 2 to 20 mass%.
【００２７】本発明で混合セメントに添加する製鋼スラ
グの一部又は全部を溶銑脱硫スラグとすることができ
る。溶銑脱硫スラグ（以下、単に“脱硫スラグ”とす
る）は鉄鋼製造プロセスの脱硫工程で発生するスラグで
あり、磁気選別などによる地金（鉄分）除去処理後の組
成は、例えば、酸化カルシウム（ＣａＯ）：５８mass
％、酸化珪素：（ＳｉＯ2）１６mass％、酸化アルミニ
ウム：（Ａｌ2Ｏ3）１０mass％、全鉄：６mass％、硫
黄：３．５mass％である。脱硫スラグは組成及び形態面
で以下のような特徴を有している。A part or all of the steelmaking slag added to the mixed cement in the present invention can be used as hot metal desulfurization slag. Hot metal desulfurization slag (hereinafter simply referred to as “desulfurization slag”) is slag generated in the desulfurization step of the steel manufacturing process, and the composition after the treatment for removing metal (iron) by magnetic sorting is, for example, calcium oxide (CaO). ): 58mass
%, Silicon oxide: (SiO 2 ) 16 mass%, aluminum oxide: (Al 2 O 3 ) 10 mass%, total iron: 6 mass%, sulfur: 3.5 mass%. The desulfurization slag has the following characteristics in terms of composition and morphology.
【００２８】（１）磁気選別などによる地金除去後にお
いて、ＣａＯの含有量が５０mass％以上と高く、未反応
ＣａＯも多く含まれている。したがって、上述した製鋼
スラグの一般的な特徴である膨張・崩壊が他の製鋼スラ
グよりも激しく起こる。(1) The content of CaO is as high as 50 mass% or more after removal of the metal by magnetic selection, and a large amount of unreacted CaO is also contained. Therefore, expansion / collapse, which is a general feature of the steelmaking slag described above, occurs more severely than other steelmaking slags.
【００２９】（２）形態として、他の製鋼スラグに較べ
て細粒の割合が多い。これは、上記のようにＣａＯの割
合が高いために、放置しておくと水和反応が進行し、膨
張・崩壊による細粒化が進行するためである。(2) As a form, the proportion of fine grains is larger than that of other steelmaking slags. This is because the proportion of CaO is high as described above, so that the hydration reaction proceeds when left to stand and the pulverization due to expansion and collapse progresses.
【００３０】（３）硫黄分を１〜４mass％程度含有して
いる。(3) Sulfur content of 1 to 4 mass% is contained.
【００３１】従来、脱硫スラグは上記（１）〜（３）の
点から土木・建築用資材としては扱いにくいものとされ
ていた。これに対して本発明者らは、脱硫スラグを混合
セメントにアルカリ刺激剤として配合した場合には、上
記（１）〜（３）のいずれもがむしろ有利な要素になり
得ることを見い出した。Conventionally, desulfurization slag has been considered to be difficult to handle as a civil engineering / construction material from the above points (1) to (3). On the other hand, the present inventors have found that when the desulfurized slag is added to the mixed cement as an alkali stimulant, any of the above (1) to (3) can be an advantageous factor.
【００３２】すなわち、上記（１）の点はアルカリ刺激
を強める効果を生じ、また上記（２）の点は、細粒であ
るために破砕・磨砕コストを省略し又は大幅に軽減する
ことができる効果を生じる。さらに、上記（３）の点に
ついては以下のような効果を生じる。すなわち、スラグ
中に硫黄分が多いと、その一部が水和反応過程において
膨張性の水和物であるエトリンガイト（３ＣａＯ・Ａｌ
2Ｏ3・３ＣａＳＯ4・３２Ｈ2Ｏ）を生成し、このような
エトリンガイトの生成がセメント組成物の強度特性の向
上に寄与する。That is, the above point (1) has the effect of strengthening the alkali stimulus, and the above point (2) is fine particles, so that the crushing / grinding cost can be omitted or greatly reduced. The effect that can be produced. Further, regarding the above point (3), the following effects are produced. That is, if the slag contains a large amount of sulfur, a part of it is an expandable hydrate, ettringite (3CaO.
2 O 3 .3CaSO 4 .32H 2 O), and the formation of such ettringite contributes to the improvement of the strength characteristics of the cement composition.
【００３３】すなわち、高炉セメントにエトリンガイト
源である石膏を添加すると強度特性を向上させることが
知られており（例えば、内川ら，セメント技術年報、２
８、６８(1974)）、その理由としては、第一に、高炉水
砕スラグの乾燥収縮はセメントのそれよりも大きいが、
その収縮をエトリンガイトが緩和する働きがあること、
第二に、初期の強度向上にエトリンガイトの生成が寄与
する（つまり、初期においてセメント粒子間の隙間をエ
トリンガイトが埋めることにより強度が向上する）ため
であると考えられている。そして、脱硫スラグをアルカ
リ刺激剤として用いる本発明のセメント組成物において
は、生成したエトリンガイトがセメントの乾燥収縮の緩
和に寄与し、その結果、強度特性が向上するものと考え
られる。したがって、この点においても脱硫スラグは従
来のアルカリ刺激剤である石灰微粉末と比較して優れた
特性を有している。That is, it is known that the addition of gypsum, which is a source of ettringite, to blast furnace cement improves the strength characteristics (see, for example, Uchikawa et al., Cement Technical Report, 2
8, 68 (1974)). The first reason is that the dry shrinkage of granulated blast furnace slag is larger than that of cement,
That ettringite has a function of alleviating the contraction,
Secondly, it is considered that the generation of ettringite contributes to the improvement of the initial strength (that is, the strength is improved by filling the gap between the cement particles with the ettringite in the initial phase). Then, in the cement composition of the present invention using desulfurized slag as an alkali stimulant, it is considered that the generated ettringite contributes to alleviate the drying shrinkage of the cement, and as a result, the strength characteristics are improved. Therefore, also in this respect, the desulfurized slag has excellent properties as compared with the lime fine powder which is a conventional alkali stimulant.
【００３４】一方、脱硫スラグをアルカリ刺激剤として
用いた場合、上記（１）の点がセメント組成物の強度低
下若しくは破壊の要因となる可能性がある。しかし、本
発明者らの検討の結果、脱硫スラグの添加量の上限を設
けることで膨張の影響を十分小さくできることが判っ
た。脱硫スラグの添加量は、混合セメント中の、あるい
は混和材として含まれる、高炉水砕スラグ、フライアッ
シュ、シリカヒューム、石膏の１種以上の質量に対する
割合で３０mass%以下であることが好ましく、さらに好
ましくは２０mass%以下とする。On the other hand, when desulfurized slag is used as an alkali stimulant, the above point (1) may cause a decrease in strength or destruction of the cement composition. However, as a result of studies by the present inventors, it was found that the influence of expansion can be sufficiently reduced by setting the upper limit of the amount of desulfurized slag added. The amount of desulfurized slag added is preferably 30 mass% or less in a ratio to the mass of one or more of granulated blast furnace slag, fly ash, silica fume, and gypsum contained in mixed cement or contained as an admixture, and It is preferably 20 mass% or less.
【００３５】脱硫スラグは、鉄鋼製造プロセスの脱硫を
目的とした精錬工程で発生するスラグであるが、その精
錬方式（例えば、精錬設備、精錬容器、精錬方法）は特
に限定されない。Desulfurization slag is slag generated in a refining process for desulfurization in a steel manufacturing process, but its refining method (for example, refining equipment, refining vessel, refining method) is not particularly limited.
【００３６】本発明で混合セメントに添加する製鋼スラ
グは上記の理由から、地金除去処理後の酸化カルシウム
の含有量が５０mass％以上の製鋼スラグを用いれば、脱
硫スラグ以外でも効果的である。For the steelmaking slag added to the mixed cement in the present invention, the steelmaking slag having a calcium oxide content of 50 mass% or more after the metal removal treatment is used for the reason other than desulfurization slag.
【００３７】また、本発明で混合セメントに添加する製
鋼スラグをエージング処理を経た製鋼スラグとするとよ
り効果的である。エージング処理を、製鋼スラグを常温
にて１日以上湿空中又は水中におく処理として行うと、
特に効果的である。It is more effective if the steelmaking slag added to the mixed cement in the present invention is a steelmaking slag that has been subjected to an aging treatment. When the aging treatment is carried out as a treatment in which the steelmaking slag is left in a moist air or water at room temperature for 1 day or more,
Especially effective.
【００３８】製鋼スラグに予めエージング処理を実施し
ておくことにより、製鋼スラグ中の未反応ＣａＯが水和
反応により水酸化カルシウムが生成する際に約２倍もの
体積膨張を伴うことに起因するセメント組成物の膨張が
抑えられ、その結果、セメント組成物の強度低下が防止
される。また、脱硫スラグの場合には未反応ＣａＯを多
く含有するため、このようなエージング処理の効果は特
に大きい。By pre-aging the steel-making slag, unreacted CaO in the steel-making slag causes about twice the volume expansion when calcium hydroxide is produced by the hydration reaction. Expansion of the composition is suppressed, and as a result, strength reduction of the cement composition is prevented. Further, since desulfurized slag contains a large amount of unreacted CaO, the effect of such aging treatment is particularly large.
【００３９】ここで、エージング処理とは製鋼スラグを
湿空中又は水中におくことによって水分（水、温水、蒸
気など）と反応させ、スラグの体積膨張や崩壊を事前に
起こさせておく処理であり、その方法は特に問わない
が、常温でエージング処理する方法としては、スラグを
湿空下におく方法、容器などを用いてスラグを水中に置
く（沈める）方法などが考えられる。ここで、スラグを
湿空下におく方法では、スラグを水中以外で水分と反応
しやすい条件下におけばよく、例えば、野積みのスラグ
に散水する方法（人為的な散水の他に降雨でもよい）な
どでもよい。Here, the aging treatment is a treatment in which the steelmaking slag is allowed to react with moisture (water, hot water, steam, etc.) by placing it in moist air or water to cause volume expansion or collapse of the slag in advance. The method is not particularly limited, but examples of the method of aging treatment at room temperature include a method of placing the slag in a moist air, a method of placing (sinking) the slag in water using a container or the like. Here, in the method of placing the slag in a moist air, it is sufficient to place the slag in a condition other than water that easily reacts with moisture, for example, a method of sprinkling the slag on the open field (in addition to artificial sprinkling, rainfall Good) etc.
【００４０】また、製鋼スラグのなかでも脱硫スラグは
特に未反応ＣａＯが多く反応性に富むため、他の製鋼ス
ラグに較べてエージング処理の期間がかなり短くて済
む。すなわち、脱硫スラグの湿空中又は水中でのエージ
ング処理の期間は１日以上、好ましくは７日以上とする
ことが望ましいが、最長でも２ヶ月程度あれば十分であ
る。Among the steelmaking slags, desulfurization slag has a large amount of unreacted CaO and is highly reactive, so that the aging treatment period is considerably shorter than that of other steelmaking slags. That is, the period of aging treatment of desulfurized slag in wet air or water is preferably 1 day or longer, preferably 7 days or longer, but a maximum of about 2 months is sufficient.
【００４１】また、製鋼スラグをさらに確実にエージン
グ処理するため、蒸気エージングや温水エージングなど
を実施してもよく、これらによれば湿空中又は水中での
エージング処理よりも短期間で処理を完了することがで
きる。Further, in order to perform the aging treatment of the steelmaking slag more reliably, steam aging or hot water aging may be carried out. According to these, the treatment is completed in a shorter period than the aging treatment in wet air or water. be able to.
【００４２】このようなエージング処理を行うことによ
り、上述したような基本的な効果に加えて、製鋼スラグ
が崩壊することによりスラグの細粒化が進み、セメント
組成物の材料として必要な微粒分の回収率が向上すると
いう効果も得られる。特に、脱硫スラグの場合は先に述
べたように元々細粒分が多い上、これにエージング処理
による崩壊作用が加わるため、微粒分の回収率が特に高
くなる利点がある。By carrying out such an aging treatment, in addition to the above-mentioned basic effects, the steelmaking slag collapses, so that the slag becomes finer and the fine particles necessary for the material of the cement composition are obtained. It is also possible to obtain the effect of improving the recovery rate of. In particular, desulfurization slag originally has a large amount of fine particles as described above, and since it has a disintegrating action due to aging treatment, it has an advantage that the recovery rate of fine particles becomes particularly high.
【００４３】以上の点から、製鋼スラグ（特に、脱硫ス
ラグ）のエージング処理は、スラグからセメント組成物
の材料に適した微粒分を高い比率で回収する手段として
も有効である。From the above points, the aging treatment of steelmaking slag (particularly desulfurization slag) is also effective as a means for recovering a high proportion of fine particles suitable for the material of the cement composition from the slag.
【００４４】次に本発明の水和硬化体について説明す
る。本発明の水和硬化体は、結合材と骨材とを含有し、
混合セメントにアルカリ刺激剤として製鋼スラグを添加
した上記のセメント組成物を、結合材として含有するこ
とを特徴とする。本発明の水和硬化体は、混合セメント
にアルカリ刺激剤として製鋼スラグを添加した結合材を
用いるので、前述した機構により水和硬化体のアルカリ
性が高まり、耐腐食性が向上し、初期強度も普通ポルト
ランドセメントに近い程度にまで向上する。添加する製
鋼スラグとしては、特に溶銑脱硫スラグが好ましく、さ
らに製鋼スラグを予めエージング処理することが効果的
である。また本発明では、骨材の一部又は全部を製鋼ス
ラグとすることができる。Next, the hydrated cured product of the present invention will be described. The hydrated cured product of the present invention contains a binder and an aggregate,
It is characterized by containing the above-mentioned cement composition obtained by adding steelmaking slag as an alkali stimulant to mixed cement as a binder. The hydrated cured product of the present invention uses a binder obtained by adding steelmaking slag as an alkali stimulant to the mixed cement, so that the alkalinity of the hydrated cured product is increased by the mechanism described above, the corrosion resistance is improved, and the initial strength is also increased. Improves to a level close to ordinary Portland cement. As the steel-making slag to be added, hot metal desulfurization slag is particularly preferable, and it is effective to pre-age the steel-making slag. Further, in the present invention, a part or the whole of the aggregate can be steelmaking slag.
【００４５】本発明の水和硬化体において、混合セメン
トの替わりにポルトランドセメントを用いて、ポルトラ
ンドセメントに対して、例えば混練時に混和材として高
炉水砕スラグ、フライアッシュ、シリカヒューム、石膏
の１種以上を配合する場合も、結合材として実質的に混
合セメントを用いているので本発明の水和硬化体に含ま
れる。また本発明と同じ構成の結合材を用いていれば、
骨材の種類、有無を問わず、本発明の水和硬化体に含ま
れる。例えば粗骨材を含まないモルタル、粗骨材、細骨
材を含まないペースト等も本発明の水和硬化体に含まれ
る。In the hydrated cured product of the present invention, portland cement is used instead of mixed cement, and one kind of granulated blast furnace slag, fly ash, silica fume and gypsum is used as an admixture for Portland cement, for example, at the time of kneading. In the case of blending the above, since substantially mixed cement is used as the binder, it is included in the hydrated product of the present invention. Moreover, if a binder having the same structure as the present invention is used,
It is included in the hydrated product of the present invention regardless of the type of aggregate and the presence or absence thereof. For example, a mortar containing no coarse aggregate, a paste containing no coarse aggregate, a fine aggregate, etc. are also included in the hydrated cured product of the present invention.
【００４６】本発明の水和硬化体に含まれる骨材（細骨
材及び／又は粗骨材）としては、天然砕石、海砂、川
砂、コンクリート廃材、高炉水砕スラグ、高炉徐冷スラ
グ、製鋼スラグなどを用いることができる。また、骨材
として製鋼スラグを用いる場合、スラグの種類に制約は
なく、例えば、脱炭スラグ、溶銑脱燐スラグ、溶銑脱硫
スラグ、溶銑脱珪スラグ、取鍋精錬スラグ、電気炉製鋼
スラグなどを用いることができる。骨材として製鋼スラ
グを用いると資源の有効利用の点で効果的である。The aggregate (fine aggregate and / or coarse aggregate) contained in the hydrated cured product of the present invention includes natural crushed stone, sea sand, river sand, concrete waste material, granulated blast furnace slag, slowly cooled blast furnace slag, Steelmaking slag or the like can be used. Further, when using steel slag as an aggregate, there is no restriction on the type of slag, for example, decarburization slag, hot metal dephosphorization slag, hot metal desulfurization slag, hot metal desiliconization slag, ladle refining slag, electric furnace steelmaking slag, etc. Can be used. The use of steelmaking slag as an aggregate is effective in terms of effective use of resources.
【００４７】但し、骨材として製鋼スラグを用いる場
合、骨材の全量ではなく一部として用いることが好まし
い。これは製鋼スラグ（特に、溶銑脱硫スラグ）を骨材
として多量に使用すると膨張崩壊の危険性が増すからで
ある。具体的には、骨材として製鋼スラグを用いる場
合、骨材中での製鋼スラグの割合は５０mass％以下とす
ることが好ましい。また、骨材として用いる製鋼スラグ
についても、先に混合セメントに添加する製鋼スラグに
関して述べたのと同じ条件でエージング処理することが
好ましい。However, when the steelmaking slag is used as the aggregate, it is preferable to use it as a part of the aggregate instead of the whole amount. This is because the risk of expansion and collapse increases when a large amount of steelmaking slag (particularly, hot metal desulfurization slag) is used as an aggregate. Specifically, when steel-making slag is used as the aggregate, the proportion of the steel-making slag in the aggregate is preferably 50 mass% or less. Further, it is preferable that the steelmaking slag used as the aggregate is also subjected to the aging treatment under the same conditions as described above for the steelmaking slag added to the mixed cement.
【００４８】本発明で用いる結合材（混合セメント、製
鋼スラグ）および骨材の粒径は、結合材ではその機能上
微粉である必要があり、粒径が０．０７５ｍｍ未満（通
常、０．０７５ｍｍ篩い下）であることが好ましく、骨
材（細骨材及び／又は粗骨材）ではその機能上ある程度
の粒径を有する必要があり、粒径が０．０７５ｍｍ以上
（通常、０．０７５ｍｍ篩い上）のものとするのが好ま
しい。従って、前記の骨材の一部又は全部を製鋼スラグ
とする場合に、結合材としての粒径と骨材としての粒径
をそれぞれ満足するスラグ粒子が含まれている適当な粒
度分布を有するスラグ（例えば、或る条件で粉砕処理し
たスラグやその粉砕処理後に篩分したスラグ）を使用す
れば、このようなスラグはそのままでセメント組成物の
結合材と骨材の両方を含有するものとして用いることが
でき、結合材と骨材を別々に準備することなく、原材料
を配合することができる。従って、製鋼スラグとして骨
材と結合材の両方を含む、粒度分布を有するスラグを用
いると効果的である。このような製鋼スラグとして、粒
径５ｍｍ以下が８５mass％以上、粒径０．０７５ｍｍ未
満が１０mass％以上の粒度分布を有するスラグを用いる
と効果的である。このような粒度分布を有する製鋼スラ
グには細骨材と結合材に好適な粒径のスラグ粒子が混在
しており、アルカリ刺激剤としての機能も十分に発揮さ
せることができる。The particle size of the binder (mixed cement, steelmaking slag) and aggregate used in the present invention must be fine powder in terms of its function in the binder, and the particle size is less than 0.075 mm (usually 0.075 mm). It is preferable that it is under a sieve, and the aggregate (fine aggregate and / or coarse aggregate) needs to have a certain particle size in terms of its function, and the particle size is 0.075 mm or more (usually 0.075 mm sieve). The above) is preferred. Therefore, in the case where a part or all of the aggregate is a steelmaking slag, a slag having an appropriate particle size distribution containing slag particles satisfying the particle size as a binder and the particle size as an aggregate, respectively. If (for example, slag crushed under a certain condition or slag sieved after the crushing process) is used, such slag is used as it is as containing both the binder and the aggregate of the cement composition. The raw materials can be compounded without separately preparing the binder and the aggregate. Therefore, it is effective to use, as the steelmaking slag, a slag having both a particle size distribution and an aggregate and a binder. As such a steelmaking slag, it is effective to use a slag having a particle size distribution of 85 mass% or more for a particle size of 5 mm or less and 10 mass% or more for a particle size of less than 0.075 mm. In the steelmaking slag having such a particle size distribution, fine aggregate and slag particles having a particle size suitable for the binder are mixed, and the function as an alkali stimulant can be sufficiently exerted.
【００４９】[0049]
【実施例】混合セメントとして、高炉セメント（Ａ種、
Ｂ種、Ｃ種）を用いてセメント組成物を作製した。本実
施例で用いた高炉A種セメントは普通ポルトランドセメ
ントの20％を高炉水砕スラグで置換したものであり、高
炉B種セメントは置換率45％、高炉C種セメントは置換率
65％のものである。これらの高炉セメントに脱硫スラグ
を表１に示す割合で添加して、結合材を作製した。高炉
セメント中の高炉スラグに対する、脱硫スラグの割合も
併記した。脱硫スラグは、７日間水中エージング処理を
行った後、篩い分けを行い0.075mm未満の粒径のもの
（0.075mm篩い下）を用いた。また、細骨材として川砂
を、粗骨材として天然砕石をそれぞれ用いた。これら結
合材（混合セメントと脱硫スラグの混合物）及び骨材と
水とを、結合材330kg/m3、水結合材比50％、細骨材比44
％で混練し、10φ×20cmのNo.１〜９の水和硬化体の供
試体を作製し、その圧縮強度、および中性化深さを測定
した。普通ポルトランドセメントを用いた供試体もNo.
１０として作製して、その圧縮強度、および中性化深さ
を測定した。圧縮強度は10φ×20cmの供試体についてJI
S A 1108に準じて測定した。中性化深さは促進中性化試
験により供試体断面にフェノールフタレインを塗布して
測定した。10φ×20cmの供試体を７日間20℃で水中養生
後、圧縮強度を測定し、30℃湿度60％、炭酸ガス濃度７
％の条件で28日養生し、圧縮強度および供試体内部への
中性化深さを測定した。これらの結果を表１に併せて示
す。[Example] As a mixed cement, blast furnace cement (A type,
A cement composition was prepared using B type and C type). The blast furnace type A cement used in this example was obtained by replacing 20% of ordinary Portland cement with granulated blast furnace slag. The blast furnace type B cement had a substitution rate of 45%, and the blast furnace type C cement had a substitution rate of 45%.
65%. Desulfurization slag was added to these blast furnace cements at a ratio shown in Table 1 to prepare binders. The ratio of desulfurized slag to blast furnace slag in blast furnace cement is also shown. The desulfurization slag was subjected to aging treatment in water for 7 days and then sieved to use one having a particle size of less than 0.075 mm (under a 0.075 mm sieve). Also, river sand was used as fine aggregate and natural crushed stone was used as coarse aggregate. These binders (mixture of mixed cement and desulfurization slag) and aggregates and water were used as binders 330kg / m 3 , water binder ratio 50%, fine aggregate ratio 44
% To prepare a hydrated cured product of No. 1 to 9 having a diameter of 10φ × 20 cm, and the compressive strength and the neutralization depth were measured. No. of specimens using ordinary Portland cement
No. 10 was manufactured, and its compressive strength and neutralization depth were measured. Compressive strength is 10φ × 20cm for specimens JI
It was measured according to SA 1108. The neutralization depth was measured by applying phenolphthalein to the cross section of the specimen by the accelerated neutralization test. A 10φ x 20 cm specimen was cured in water at 20 ° C for 7 days, and the compressive strength was measured. 30 ° C humidity 60%, carbon dioxide concentration 7
%, And the compressive strength and the neutralization depth inside the specimen were measured. The results are also shown in Table 1.
【００５０】[0050]
【表１】 [Table 1]
【００５１】表１によれば、高炉セメントＡ種、Ｂ種、
Ｃ種のいずれを用いた場合も、アルカリ刺激剤として脱
硫スラグを配合した供試体No.１〜６は、7日圧縮強度が
増大し、中性化深さは減少した。高炉Ａ種セメントに脱
硫スラグを配合したNo.５は普通ポルトランドセメント
を用いたNo.１０に近い7日圧縮強度及び中性化深さに、
高炉Ｂ種セメントに脱硫スラグを配合したNo.１〜４は
高炉Ａ種セメントのみを結合材に用いたNo.７に近い7日
圧縮強度及び中性化深さに、高炉Ｃ種セメントに脱硫ス
ラグを配合したNo.６は高炉Ｂ種セメントのみを結合材
に用いたNo.８に近い7日圧縮強度及び中性化深さに、そ
れぞれ改善された。よって初期強度が向上し、中性化速
度が大きくなる問題が改善されたことが分かった。According to Table 1, blast furnace cement type A, type B,
In the case of using any of the C-types, Sample Nos. 1 to 6 in which desulfurization slag was blended as the alkali stimulant had an increased 7-day compressive strength and a decreased neutralization depth. No.5, which is a mixture of desulfurized slag with blast furnace type A cement, has a 7-day compressive strength and neutralization depth similar to No.10, which uses ordinary Portland cement.
Nos. 1 to 4 in which desulfurization slag was mixed with blast furnace type B cement were desulfurized into blast furnace type C cement at 7 days compressive strength and neutralization depth close to No. 7 using only blast furnace type A cement as the binder. No. 6 containing slag was improved to 7-day compressive strength and neutralization depth close to No. 8 using only blast furnace type B cement as the binder. Therefore, it was found that the problem that the initial strength was improved and the neutralization rate was increased was improved.
【００５２】[0052]
【発明の効果】以上述べたように、本発明によれば、初
期強度が普通ポルトランドセメントに近く、かつ耐腐食
性に優れたセメント組成物が得られる。しかも製鋼スラ
グを用いるため簡便かつ安価であり、省資源や環境保全
に貢献できる。As described above, according to the present invention, a cement composition having an initial strength close to that of ordinary Portland cement and excellent corrosion resistance can be obtained. Moreover, since steel slag is used, it is simple and inexpensive, and can contribute to resource saving and environmental conservation.
フロントページの続き (72)発明者 薮田 和哉 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 高橋 達人 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 Ｆターム(参考） 4G012 PA29 PC04 PC11 Continued front page (72) Inventor Kazuya Yabuta 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Tatsuto Takahashi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. F-term (reference) 4G012 PA29 PC04 PC11
Claims (10)
鋼スラグを添加したことを特徴とするセメント組成物。1. A cement composition comprising a steelmaking slag as an alkali stimulant added to a mixed cement.
に混和材として高炉水砕スラグ、フライアッシュ、シリ
カヒュームの中から選ばれる１種以上を混合したセメン
トであることを特徴とする、請求項１に記載のセメント
組成物。2. The cement according to claim 1, wherein the mixed cement is a mixture of Portland cement with at least one selected from granulated blast furnace slag, fly ash and silica fume as an admixture. Cement composition.
ラグであることを特徴とする請求項１または請求項２に
記載のセメント組成物。3. The cement composition according to claim 1, wherein a part or all of the steelmaking slag is hot metal desulfurization slag.
ルシウムの含有量が５０mass％以上の製鋼スラグである
ことを特徴とする請求項１または請求項２に記載のセメ
ント組成物。4. The cement composition according to claim 1 or 2, wherein the steelmaking slag is a steelmaking slag having a calcium oxide content of 50 mass% or more after the metal removal treatment.
スラグであることを特徴とする請求項１ないし請求項４
のいずれかに記載のセメント組成物。5. The steelmaking slag is a steelmaking slag that has been subjected to an aging treatment.
The cement composition according to any one of 1.
１日以上湿空中又は水中におく処理であることを特徴と
する請求項５に記載のセメント組成物。6. The cement composition according to claim 5, wherein the aging treatment is a treatment in which the steelmaking slag is left in a moist air or water at room temperature for 1 day or more.
れかに記載のセメント組成物を結合材として含有するこ
とを特徴とする水和硬化体。7. A hydrated cured product comprising an aggregate and the cement composition according to claim 1 as a binder.
ることを特徴とする請求項７に記載の水和硬化体。8. The hydrated product according to claim 7, wherein a part or all of the aggregate is made of steelmaking slag.
を含む粒度分布を有するスラグを用いることを特徴とす
る請求項７または請求項８に記載の水和硬化体。9. The hydrated cured product according to claim 7, wherein the steelmaking slag is a slag having a particle size distribution containing both an aggregate and a binder.
８５mass％以上、粒径０．０７５ｍｍ未満が１０mass％
以上の粒度分布を有するスラグを用いることを特徴とす
る請求項９に記載の水和硬化体。10. A steelmaking slag having a particle size of 5 mm or less is 85 mass% or more, and a particle size of less than 0.075 mm is 10 mass%.
The hydrated cured product according to claim 9, wherein a slag having the above particle size distribution is used.
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