JP3565062B2 - Hardened body using steelmaking slag - Google Patents
Hardened body using steelmaking slag Download PDFInfo
- Publication number
- JP3565062B2 JP3565062B2 JP34943898A JP34943898A JP3565062B2 JP 3565062 B2 JP3565062 B2 JP 3565062B2 JP 34943898 A JP34943898 A JP 34943898A JP 34943898 A JP34943898 A JP 34943898A JP 3565062 B2 JP3565062 B2 JP 3565062B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- steelmaking slag
- steelmaking
- aggregate
- aqueous solution
- 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.)
- Expired - Fee Related
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
-
- 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
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0086—Chelating or complexing agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、モルタル、コンクリートの代替となる製鋼スラグを用いた水和硬化体を提供に関する。
【０００２】
【従来の技術】
製鋼スラグは、化学組成が高炉スラグほど安定してない、使用中に膨張・粉化するなどの問題があるため、埋立用材料や道路路盤材などの一部に利用されているに過ぎない。
【０００３】
一方、文献１〔坪井ら：セメント技術年報、２８、９８（１９７４）〕などに見られるように、古くから製鋼系スラグには水硬性があることが知られており、文献２〔野村ら：鉄と鋼、６６（１９８０）Ｓ１４７〕では、製鋼スラグの用途拡大を目的として水硬性の促進方法が検討されている。文献２によれば、転炉スラグの粉末に水砕スラグ粉末、石膏、ＣａＣｌ２を加えると水硬性が促進され、その強度発現機構は粗粒の転炉スラグが骨材として作用していることによると考察している。
【０００４】
【発明が解決しようとする課題】
しかしながら、この製鋼スラグの水硬性を利用した実際の用途については言及されていない。
【０００５】
本発明は、製鋼スラグを用いたモルタル、コンクリートの代替となる水和硬化体を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記課題は、比表面積が1000cm2/g以上の製鋼スラグと骨材の混合物がキレート化剤を含む水溶液で混練された製鋼スラグを用いた水和硬化体により解決される。
【０００７】
一般に、製鋼スラグの水硬性の反応速度は非常に遅いため、そのままではモルタルやコンクリートの代替として利用できない。そこで、何らかの方法で水硬性を促進させる必要がある。上記文献２のように水砕スラグ粉末、石膏、ＣａＣｌ２の副原料を合計で２０％近く添加して促進する方法もあるが、製鋼スラグの利用率が低下するので好ましくない。
【０００８】
本発明者らは、水砕スラグ粉末、石膏、CaCl2のなどの副原料を添加せず、製鋼スラグをキレート化剤を含む水溶液で混練すれば、その水硬性を促進でき、しかも製鋼スラグとして比表面積が1000cm2/g以上の粉末の製鋼スラグを用い、骨材を加えれて混練すれば、モルタルやコンクリートの代替となる水和硬化体が得られることを見出した。その原因は必ずしも明らかでないが、キレート化剤により製鋼スラグに含まれている難溶性の2CaO・Fe2O3や2CaO・SiO2が溶解し、水和反応が促進されたためと推察される。
【０００９】
骨材としては、細骨材、粗骨材ともに、製鋼スラグ、高炉徐冷スラグ、天然石から選ばれた１種または２種以上の混合物を用いることが望ましい。
【００１０】
キレート化剤としては、強アルカリ性溶液中で鉄、アルミニウム、マンガンなどの３価の金属イオンとキレート化合物を形成するトリエタノールアミン、トリイソプロパノールアミン、フェノールから選ばれた１種または２種以上の混合物を用いることが望ましい。
【００１１】
キレート化剤を含む水溶液中のキレート化剤の濃度は、少量でも水硬性を促進する効果を有するが、０．０００５ｗｔ％以上にすると水硬性の促進が顕著になる。
【００１２】
比表面積が１０００ｃｍ２／ｇ以上の製鋼スラグは、粉末であるため経時的に膨張・粉化し難いが、膨張・粉化を完全に抑制するには、エージング処理された製鋼スラグを用いる方が好ましい。また、骨材に製鋼スラグを用いる場合も、同様な理由で、エージング処理された製鋼スラグを用いる方が好ましい。
【００１３】
製鋼スラグとしては、転炉、電気炉、混銑炉などで発生したスラグのみならず、溶銑予備処理スラグなども用いることができる。なお、骨材として製鋼スラグを用いる場合も同様である。
【００１４】
【実施例】
（実施例１）
蒸気エージングによりＪＩＳ Ａ ５０１５に規定された水浸膨張比を０．５％とした転炉スラグを比表面積３０００ｃｍ２／ｇに粉砕し、細骨材、粗骨材として高炉徐冷スラグを加え、種々のキレート化剤を１ｗｔ％含む水溶液で混練してモルタル試料を作成した。このとき、配合比は、重量比で水溶液１に対し、転炉スラグ２、細骨材５、粗骨材８とした。また、用いたキレート化剤は、トリエタノールアミン、トリイソプロパノールアミン、フェノールである。そして、作成後２８日、９１日および３６５目の圧縮強度を、ＪＩＳ Ａ １１０８にしたがって測定した。
【００１５】
結果を表１に示す。
いずれのキレート化剤においても、材令とともに強度は増加しており、３６５日目で普通ポルトランドセメントで作成したモルタルの圧縮強度を大きく上回る圧縮強度が得られる。
【００１６】
【表１】
（実施例２）
実施例１の粉砕した転炉スラグに、種々の細骨材、粗骨材を加え、キレート化剤としてトリエタノールアミンを１ｗｔ％含む水溶液で混練して試料を作成した。このとき、水溶液、転炉スラグ、細骨材、粗骨材の配合比は実施例１の場合と同じである。また、用いた細骨材、粗骨材は、受け入れままの転炉スラグ、６ヶ月間エージング処理した転炉スラグ、高炉徐冷スラグ、天然石である。そして、実施例１と同様に、圧縮強度を測定した。
【００１８】
結果を表２に示す。
実施例１の場合と同様に、いずれの骨材においても材令とともに強度は増加しており、３６５日目で普通ポルトランドセメントで作成したモルタルの圧縮強度を大きく上回る圧縮強度が得られる。
【００１９】
【表２】
【発明の効果】
本発明は以上説明したように構成されているので、製鋼スラグを用いたモルタル、コンクリートの代替となる水和硬化体を提供できる。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hydrated and hardened body using steelmaking slag as a substitute for mortar and concrete.
[0002]
[Prior art]
Steelmaking slag is used only as a part of landfill materials and roadbed materials because it has problems such as the chemical composition being not as stable as blast furnace slag and expanding and pulverizing during use.
[0003]
On the other hand, as shown in Document 1 [Tsuboi et al .: Annual Report of Cement Technology, 28, 98 (1974)], it has been known that steelmaking slag has hydraulic properties since ancient times, and Document 2 [Nomura et al. In iron and steel, 66 (1980) S147], a method for promoting hydraulicity is being studied for the purpose of expanding the use of steelmaking slag. According to Literature 2, adding granulated slag powder, gypsum, and CaCl 2 to converter slag powder promotes hydraulicity, and the mechanism of strength development is that coarse converter slag acts as aggregate. According to the study.
[0004]
[Problems to be solved by the invention]
However, there is no mention of an actual application utilizing the hydraulic properties of this steelmaking slag.
[0005]
An object of the present invention is to provide a hydrated hardened material which is an alternative to mortar and concrete using steelmaking slag.
[0006]
[Means for Solving the Problems]
The above problem is solved by a hydrated hardened product using a steelmaking slag in which a mixture of a steelmaking slag having a specific surface area of 1000 cm 2 / g or more and an aggregate is kneaded with an aqueous solution containing a chelating agent.
[0007]
Generally, the reaction rate of hydraulic property of steelmaking slag is very slow, and therefore cannot be used as a substitute for mortar or concrete as it is. Therefore, it is necessary to promote hydraulicity by some method. Although there is a method of adding granulated slag powder, gypsum, and auxiliary materials of CaCl 2 by a total of nearly 20% as in the above-mentioned literature 2 to promote the method, it is not preferable because the utilization rate of steelmaking slag decreases.
[0008]
The present inventors can granulate steelmaking slag with an aqueous solution containing a chelating agent without adding auxiliary materials such as granulated slag powder, gypsum, and CaCl 2 to promote the hydraulicity of the steelmaking slag, and furthermore, as a steelmaking slag. It has been found that if powdered steelmaking slag having a specific surface area of 1000 cm 2 / g or more is added and kneaded with an aggregate, a hydrated cured product that can be used as a substitute for mortar or concrete can be obtained. Although the cause is not clear, the chelating agent dissolved 2CaO · Fe 2 O 3 and 2CaO · SiO 2 hardly soluble contained in steel slag, the hydration reaction is presumably because promoted.
[0009]
As the aggregate, it is desirable to use one or a mixture of two or more selected from steelmaking slag, blast furnace slowly cooled slag, and natural stone for both fine aggregate and coarse aggregate.
[0010]
As the chelating agent, one or a mixture of two or more selected from triethanolamine, triisopropanolamine, and phenol that form a chelate compound with a trivalent metal ion such as iron, aluminum, and manganese in a strongly alkaline solution It is desirable to use
[0011]
Even if the concentration of the chelating agent in the aqueous solution containing the chelating agent is small, it has the effect of promoting hydraulic property, but if it is 0.0005 wt% or more, the promotion of hydraulic property becomes remarkable.
[0012]
Steelmaking slag having a specific surface area of 1000 cm 2 / g or more is hard to expand and powder over time because it is a powder, but in order to completely suppress expansion and powdering, it is preferable to use aging-treated steelmaking slag. . Also, when using a steelmaking slag as an aggregate, it is preferable to use an aged steelmaking slag for the same reason.
[0013]
As the steelmaking slag, not only slag generated in a converter, an electric furnace, a mixed-iron furnace, and the like, but also hot metal pretreatment slag and the like can be used. The same applies to the case where steelmaking slag is used as the aggregate.
[0014]
【Example】
(Example 1)
Converter slag having a water immersion expansion ratio of 0.5% specified in JIS A 5015 by steam aging was pulverized to a specific surface area of 3000 cm 2 / g, and blast furnace slow cooling slag was added as fine aggregate and coarse aggregate. A mortar sample was prepared by kneading with an aqueous solution containing 1 wt% of various chelating agents. At this time, the mixing ratio was such that the converter slag 2, the fine aggregate 5, and the coarse aggregate 8 were in a weight ratio with respect to the aqueous solution 1. The chelating agents used are triethanolamine, triisopropanolamine and phenol. The compressive strength was measured 28 days, 91 days and 365 days after the preparation according to JIS A 1108.
[0015]
Table 1 shows the results.
In any of the chelating agents, the strength increases with the age, and a compressive strength that greatly exceeds the compressive strength of the mortar made of ordinary Portland cement is obtained on the 365th day.
[0016]
[Table 1]
(Example 2)
Various fine aggregates and coarse aggregates were added to the pulverized converter slag of Example 1, and kneaded with an aqueous solution containing 1 wt% of triethanolamine as a chelating agent to prepare a sample. At this time, the mixing ratio of the aqueous solution, converter slag, fine aggregate, and coarse aggregate is the same as in the first embodiment. The fine aggregate and coarse aggregate used were converter slag as received, converter slag aged for 6 months, blast furnace slowly cooled slag, and natural stone. Then, the compressive strength was measured in the same manner as in Example 1.
[0018]
Table 2 shows the results.
As in the case of Example 1, the strength of any of the aggregates increases with the age, and a compressive strength that greatly exceeds the compressive strength of the mortar made of ordinary Portland cement is obtained on the 365th day.
[0019]
[Table 2]
【The invention's effect】
Since the present invention is configured as described above, it is possible to provide a hydrated hardened material which is an alternative to mortar and concrete using steelmaking slag.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34943898A JP3565062B2 (en) | 1998-12-09 | 1998-12-09 | Hardened body using steelmaking slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34943898A JP3565062B2 (en) | 1998-12-09 | 1998-12-09 | Hardened body using steelmaking slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000169212A JP2000169212A (en) | 2000-06-20 |
| JP3565062B2 true JP3565062B2 (en) | 2004-09-15 |
Family
ID=18403758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34943898A Expired - Fee Related JP3565062B2 (en) | 1998-12-09 | 1998-12-09 | Hardened body using steelmaking slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3565062B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030060528A (en) * | 2002-01-09 | 2003-07-16 | 세연에스앤알 주식회사 | Cement concrete and mortar comprising steel-making slag |
| US10112871B2 (en) * | 2014-03-21 | 2018-10-30 | The Royal Institution For The Advancement Of Learning/Mcgill University | Carbonate-bonded construction products from steel-making residues and method for making the same |
| CN113597418B (en) * | 2019-03-21 | 2023-03-10 | 塔塔钢铁艾默伊登有限责任公司 | Method for manufacturing high-end-performance steel slag material-based building product |
| EP4337626A1 (en) | 2021-05-10 | 2024-03-20 | Sika Technology AG | Accelerators for the reaction of steelmaking slag with water |
| CN114163155A (en) * | 2021-12-02 | 2022-03-11 | 电子科技大学长三角研究院(湖州) | Preparation and application of novel improved composite steel slag excitant |
| EP4276084A1 (en) | 2022-05-10 | 2023-11-15 | Ecocem Materials Limited | Hydraulic binder compositions comprising steel making slag, a co-binder and an alkali mineral salt |
-
1998
- 1998-12-09 JP JP34943898A patent/JP3565062B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000169212A (en) | 2000-06-20 |
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