JPH11292588A - Method for reducing water absorptivity of blast furnace slowly cooled slag - Google Patents
Method for reducing water absorptivity of blast furnace slowly cooled slagInfo
- Publication number
- JPH11292588A JPH11292588A JP11007898A JP11007898A JPH11292588A JP H11292588 A JPH11292588 A JP H11292588A JP 11007898 A JP11007898 A JP 11007898A JP 11007898 A JP11007898 A JP 11007898A JP H11292588 A JPH11292588 A JP H11292588A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- blast furnace
- water
- cement
- slowly cooled
- 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.)
- Withdrawn
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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、コンクリート用粗
骨材などに適する高炉徐冷スラグの吸水率低下方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reducing the water absorption of blast furnace slag which is suitable for coarse aggregate for concrete and the like.
【０００２】[0002]
【従来の技術】現在、高炉スラグは主に次の２通りの方
法で有効利用されている。その中の１つは、溶融高炉ス
ラグに水を噴射して急冷破砕して、直径５ｍｍ以下のい
わゆる水砕スラグとし、その水硬性を利用して高炉セメ
ント原料やコンクリート混和材とする方法である。も
し、緻密な水砕いわゆる硬質水砕が得られれば、コンク
リート用細骨材に使用することも可能であり、現に一部
の水砕はそのように利用されている。また他の１つは、
溶融高炉スラグを畠と呼ばれる広大な敷地、あるいはド
ライピットに放流して自然冷却または散水冷却後、適度
の大きさに破砕してバラスとし、コンクリート用粗骨材
や路盤材等に利用する方法である。2. Description of the Related Art At present, blast furnace slag is effectively used mainly in the following two ways. One of them is a method of injecting water into a molten blast furnace slag and quenching and crushing it to form a so-called granulated slag having a diameter of 5 mm or less, and using the hydraulic property thereof as a blast furnace cement raw material or a concrete admixture. . If dense granulation, so-called hard granulation, can be obtained, it can be used for fine aggregate for concrete, and some granules are actually used as such. Another one is
Discharge molten blast furnace slag to a large site called a field or a dry pit, cool it naturally or spray water, then crush it to an appropriate size and make it into a ballast, and use it as coarse aggregate for concrete or roadbed material etc. is there.
【０００３】ところで、建築・土木の分野で使用するコ
ンクリートについて、良質な骨材の不足が深刻になって
いる。高炉徐冷スラグは、一部の天然砕石のようにアル
カリ骨材反応を引き起こしやすいある種のシリカ系鉱物
がほとんど含まれていないので、アルカリ骨材反応抑制
には有利であるが、吸水率が比較的高く、コンクリート
粗骨材として使用した場合、水が高炉徐冷スラグに吸水
されてセメントに十分に供給されず、強度や流動性の低
下を招くことがある。従って、高炉徐冷スラグの吸水率
を低下させることが望まれる。高炉徐冷スラグの吸水率
を低下させる方法としては、例えば、特開昭５７−１１
６１５４号公報に開示されるように、溶融状態の高炉ス
ラグを数ｍｍ厚の板状に成形することにより大きな冷却
速度で凝固させ、凝固してから水をかけるという方法が
ある。[0003] In concrete used in the fields of construction and civil engineering, there is a serious shortage of high quality aggregate. Slowly cooled blast furnace slag contains few silica-based minerals that easily cause an alkali-aggregate reaction like some natural crushed stones. Relatively high, when used as concrete coarse aggregate, water is absorbed by the blast furnace slow cooling slag and is not sufficiently supplied to the cement, which may cause a decrease in strength and fluidity. Therefore, it is desired to reduce the water absorption of the blast furnace slow cooling slag. As a method for reducing the water absorption of the blast furnace slowly cooled slag, for example, JP-A-57-11
As disclosed in Japanese Patent No. 6154, there is a method in which blast furnace slag in a molten state is formed into a plate having a thickness of several mm to solidify at a high cooling rate, and water is applied after solidification.
【０００４】[0004]
【発明が解決しようとする課題】特開昭５７−１１６１
５４号公報に開示された方法では、溶融状態でスラグに
溶解していた窒素が凝固時に放出されることで形成され
る開気孔を防止することはできなかった。Problems to be Solved by the Invention
According to the method disclosed in Japanese Patent Publication No. 54, it was not possible to prevent open pores formed by releasing nitrogen dissolved in slag in a molten state during solidification.
【０００５】そこで、本発明の目的は、上記の従来技術
の問題点に鑑み、確実に高炉徐冷スラグの吸水率を低下
させる方法を提供することにある。Accordingly, an object of the present invention is to provide a method for reliably reducing the water absorption of blast furnace slowly cooled slag in view of the above-mentioned problems of the prior art.
【０００６】[0006]
【課題を解決するための手段】本発明は、高炉徐冷スラ
グを破砕後、重量比で高炉徐冷スラグ：水：セメント＝
５０００：５００〜２５００：１０〜５０で混合し、１
日以上養生することを特徴とする高炉徐冷スラグの吸水
率低下方法である。養生後、更に水とセメントを加えて
混合し養生することを１回以上行ってもよい。According to the present invention, after blast furnace blast furnace slag is crushed, blast furnace blast furnace slag: water: cement =
5000: 500 to 2500: 10 to 50, 1
This is a method for lowering the water absorption of blast furnace slow cooling slag characterized by curing for at least one day. After curing, water and cement may be added, mixed and cured one or more times.
【０００７】[0007]
【発明の実施の形態】以下、本発明の詳細について説明
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below.
【０００８】高炉徐冷スラグの吸水率が比較的高い原因
は、次の通りであると考えられる。すなわち、溶融高炉
スラグが強還元雰囲気の高炉炉内を流れ落ちる間にスラ
グ中へ窒素が溶解する。この窒素はスラグ中で窒化物を
形成している。高炉徐冷スラグを製造する場合、畠やド
ライピットへ溶融高炉スラグを放流して自然冷却する
と、スラグの窒素溶解度が温度低下とともに低下し、溶
解しきれなくなった窒素が放出される。このときスラグ
に気孔が形成され、吸水率が増加する。また、現状で
は、生産性向上のため溶融状態のスラグに散水して凝固
を早め、畠やドライピットの回転率を上げることが一般
に行われている。その場合、溶融状態のスラグと水が接
触し、水が冷却の比較的短い時間内にスラグ中に溶解侵
入し、窒素と水が下記（１）式数１のように反応する
（製鉄研究、Ｎｏ．３０１、Ｐ１４〜１８、１９８０
年）。The reason why the water absorption of the blast furnace slag is relatively high is considered to be as follows. That is, nitrogen melts into the slag while the molten blast furnace slag flows down in the blast furnace in the strong reducing atmosphere. This nitrogen forms nitrides in the slag. When producing a blast furnace slowly cooled slag, when the molten blast furnace slag is discharged into a field or a dry pit and naturally cooled, the nitrogen solubility of the slag decreases as the temperature decreases, and nitrogen that cannot be completely dissolved is released. At this time, pores are formed in the slag, and the water absorption increases. Further, at present, it is common practice to sprinkle water on slag in a molten state to speed up solidification and increase the rotation rate of the field and the dry pit in order to improve productivity. In this case, the molten slag comes into contact with water, the water dissolves and infiltrates into the slag within a relatively short time of cooling, and nitrogen and water react as shown in the following equation (1) (Steelmaking research, No. 301, P14-18, 1980
Year).
【０００９】[0009]
【数１】 ２Ｎ3-＋３Ｈ2 Ｏ→Ｎ2 ＋３Ｈ2 ＋３Ｏ2- …（１）## EQU1 ## 2N 3- + 3H 2 O → N 2 + 3H 2 + 3O 2 -... (1)
【００１０】（１）式の右辺に示すように、この反応で
窒素ガスと水素ガスが生成し、スラグが発泡してスラグ
に気孔が形成される。このような気孔のうちで、特に開
気孔に水が吸い込まれることが吸水率増加を引き起こ
す。As shown on the right side of equation (1), this reaction generates nitrogen gas and hydrogen gas, and the slag foams to form pores in the slag. Among such pores, the fact that water is sucked into the open pores in particular causes an increase in water absorption.
【００１１】特開昭５７−１１６１５４号公報に開示さ
れた方法は、薄い板状にすることで冷却速度を高め、凝
固してから水で更に冷却するものであったが、本発明の
方法は、冷間で一種のコーティングによりスラグの開気
孔を塞ぐ方法である。すなわち、高炉徐冷スラグを破砕
後、重量比で高炉徐冷スラグ：水：セメント＝５００
０：５００〜２５００：１０〜５０で混合し、１日以上
養生する方法であり、養生後、更に水とセメントを加え
て混合し養生することを１回以上行ってもよい。これに
より、セメントがスラグ表面に付着して水和反応を起こ
し、セメントゲルを形成して開気孔を塞ぎ、吸水率が低
下する。The method disclosed in Japanese Patent Application Laid-Open No. 57-116154 is to increase the cooling rate by forming a thin plate, and to further solidify and then further cool with water. This is a method of closing the open pores of the slag with a kind of coating in the cold. That is, after crushing the blast furnace slag, the weight ratio of the blast furnace slag: water: cement = 500.
This is a method of mixing at 0: 500 to 2500: 10 to 50 and curing for one day or more. After curing, water and cement may be further added and mixed for curing once or more. As a result, the cement adheres to the slag surface to cause a hydration reaction, thereby forming a cement gel, closing the open pores, and reducing the water absorption.
【００１２】重量比で高炉徐冷スラグ５０００に対して
水を５００〜２５００とするのは、５００未満では水が
スラグ表面を十分に覆うことはできないし、また２５０
０を越えると、スラグ粒間に留まらずに流失する水が増
加し、そのときセメントも失われるからである。重量比
で高炉徐冷スラグ５０００に対してセメントを１０〜５
０とするのは、１０未満では、開気孔を塞ぐのに不十分
であり、５０を越えても吸水率改善効果が飽和してセメ
ントが無駄になるだけでなく、さらに、スラグ粒同士が
セメントで固結して粒度分布が変化し、また、スラグ粒
間の隙間が新たな吸水率増加要因となるからである。養
生期間を１日以上とするのは、１日未満ではセメントの
水和が十分に進行しないからである。１回のセメント塗
布・養生で吸水率が目標の値にならなければ、セメント
塗布・養生を繰り返せばよい。When the weight ratio of water to 500 to 2500 with respect to the blast furnace slow cooling slag 5000 is less than 500, the water cannot cover the slag surface sufficiently,
If it exceeds 0, the amount of water flowing away without remaining between the slag grains increases, and at that time, the cement is also lost. 10 to 5 cements are added to blast furnace slag 5000 by weight ratio.
If the value is set to 0, if the value is less than 10, it is insufficient to close the open pores. This causes the particle size distribution to change and the gap between the slag particles to become a new factor of increasing the water absorption. The curing period is set to one day or more because if it is less than one day, hydration of the cement does not sufficiently proceed. If the water absorption does not reach the target value in one application and curing of the cement, the application and curing of the cement may be repeated.
【００１３】ここで、セメントとしては、ポルトランド
セメント、高炉セメントなどがあげられる。Here, examples of the cement include Portland cement, blast furnace cement and the like.
【００１４】[0014]
【実施例】以下、本発明を実施例によって、更に詳細に
説明する。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples.
【００１５】本実施例においては、高炉徐冷スラグを破
砕して５〜２０ｍｍに粒度調整してから、表１に示す処
理条件でスラグ、水およびセメントを混合し養生した。In this embodiment, the blast furnace blast furnace slag was crushed to adjust the particle size to 5 to 20 mm, and then slag, water and cement were mixed and cured under the processing conditions shown in Table 1.
【００１６】一方、従来法のＮｏ．２として、特開昭５
７−１１６１５４号公報に開示された方法、すなわち溶
融状態の高炉スラグを数ｍｍ厚の板状に成形して凝固さ
せ、凝固してから水をかけるという方法を行った。On the other hand, the conventional method No. 2
A method disclosed in Japanese Patent Application Laid-Open No. 7-116154, that is, a method in which a blast furnace slag in a molten state is formed into a plate having a thickness of several mm, solidified, solidified, and then watered.
【００１７】以上のそれぞれの方法で高炉徐冷スラグを
製造または処理した後に、吸水率を測定した。吸水率の
測定はＪＩＳ Ａ １１１０で制定された方法に従っ
た。吸水率の結果も表１に示す。表１より明らかなよう
に、本発明の方法によるものは、ＪＩＳ Ａ ５００５
のコンクリート用砕石の規格である吸水率＜３％を満足
した。しかし、従来法のＮｏ．２ではこの規格を満足し
なかった。なお従来法のＮｏ．１は未処理の高炉徐冷ス
ラグである。After the blast furnace slow cooling slag was manufactured or treated by the above-described methods, the water absorption was measured. The measurement of the water absorption was in accordance with the method established in JIS A 1110. Table 1 also shows the results of the water absorption. As is clear from Table 1, the method according to the present invention is JIS A 5005
Satisfies the water absorption <3%, which is the standard for crushed stones for concrete. However, no. No. 2 did not satisfy this standard. In addition, No. of the conventional method. Reference numeral 1 denotes an untreated blast furnace slow cooling slag.
【００１８】[0018]
【表１】 [Table 1]
【００１９】[0019]
【発明の効果】本発明の方法によって、安価で確実に吸
水率の低い高炉徐冷スラグを製造することが可能とな
る。その結果、高炉徐冷スラグを路盤材だけでなくコン
クリート骨材としても使用できるようになり、高炉スラ
グの資源化に大きく貢献できる。According to the method of the present invention, it is possible to produce a blast furnace slowly cooled slag which is inexpensive and surely has a low water absorption. As a result, the blast furnace slag can be used not only as a roadbed material but also as a concrete aggregate, which can greatly contribute to recycling of the blast furnace slag.
Claims (2)
徐冷スラグ：水：セメント＝５０００：５００〜２５０
０：１０〜５０で混合し、１日以上養生することを特徴
とする高炉徐冷スラグの吸水率低下方法。After crushing the blast furnace slag, the weight ratio of blast furnace slag: water: cement = 5000: 500-250.
A method for lowering the water absorption of blast furnace slowly cooled slag, which comprises mixing at 0:10 to 50 and curing for at least one day.
低下方法において、養生後に、更に水とセメントを加え
て混合し養生することを１回以上行うことを特徴とする
高炉徐冷スラグの吸水率低下方法。2. The method for reducing the water absorption of a blast furnace slowly cooled slag according to claim 1, wherein, after curing, water and cement are further added and mixed and cured once or more. Method of reducing water absorption.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11007898A JPH11292588A (en) | 1998-04-07 | 1998-04-07 | Method for reducing water absorptivity of blast furnace slowly cooled slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11007898A JPH11292588A (en) | 1998-04-07 | 1998-04-07 | Method for reducing water absorptivity of blast furnace slowly cooled slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11292588A true JPH11292588A (en) | 1999-10-26 |
Family
ID=14526485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11007898A Withdrawn JPH11292588A (en) | 1998-04-07 | 1998-04-07 | Method for reducing water absorptivity of blast furnace slowly cooled slag |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11292588A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030003965A (en) * | 2001-07-04 | 2003-01-14 | 한국건설기술연구원 | Manufacturing methods of permeable pavement and block using the water-quenched blast furnace slag, pavement method using the same |
| JP2003201164A (en) * | 2001-12-31 | 2003-07-15 | Sengoku:Kk | Concrete obtained by mainly using industrial waste material and method of producing concrete product |
| JP2007247172A (en) * | 2006-03-14 | 2007-09-27 | Jfe Steel Kk | Roadbed material and its manufacturing method |
-
1998
- 1998-04-07 JP JP11007898A patent/JPH11292588A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030003965A (en) * | 2001-07-04 | 2003-01-14 | 한국건설기술연구원 | Manufacturing methods of permeable pavement and block using the water-quenched blast furnace slag, pavement method using the same |
| JP2003201164A (en) * | 2001-12-31 | 2003-07-15 | Sengoku:Kk | Concrete obtained by mainly using industrial waste material and method of producing concrete product |
| JP2007247172A (en) * | 2006-03-14 | 2007-09-27 | Jfe Steel Kk | Roadbed material and its manufacturing method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4933013A (en) | Hydraulic material composition having high strength | |
| CN100360450C (en) | Method for producing hardened slag product | |
| JP2004299922A (en) | Method for producing set object | |
| JPH11292588A (en) | Method for reducing water absorptivity of blast furnace slowly cooled slag | |
| JP7173827B2 (en) | Ultra fast-hardening composition, cement composition, concrete composition and spraying method | |
| JP2003183717A (en) | Steel slag product and manufacturing method therefor | |
| JP6292257B2 (en) | Hydrated solidified product using desulfurized slag | |
| JP4136520B2 (en) | Foam glass manufacturing method | |
| JP2004277191A (en) | Coarse aggregate for concrete | |
| JPH02160895A (en) | Foundation conditioner | |
| JP2013040069A (en) | Steel slag subbase and method of producing the same | |
| JPS6126537A (en) | Use of steel slag | |
| JPS61238398A (en) | Preparation of submerged sludge curing material | |
| JP3190216B2 (en) | How to force aging of slag | |
| JP3583323B2 (en) | Blast furnace slag fine aggregate, method for producing the same, and fine aggregate for concrete or mortar | |
| JP3644330B2 (en) | Treatment method for reducing slag | |
| JP2003146724A (en) | Spray concrete layer | |
| Zhang et al. | Effect of wet milling activation on mechanical properties and hydration process of cement composites with blast furnace slag | |
| JP2001048603A (en) | Production of blast-furnace slag fine aggregate | |
| JP2005032683A (en) | Electromagnetic wave heatable composition | |
| JPH05279095A (en) | Method of utilizing converter slug and preliminarily treated | |
| JP2001270769A (en) | Method for manufacturing subgrade material | |
| DE19533998C1 (en) | Broken up cupola furnace slag as additive in cement and lime bonded construction material | |
| JPH0664949A (en) | Method for reclaiming concrete waste | |
| WO2024123281A1 (en) | A concrete comprising dusts and/or ashes obtained from ferrochrome chimneys as a component |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20050607 |