JPH0321682B2 - - Google Patents
Info
- Publication number
- JPH0321682B2 JPH0321682B2 JP14403682A JP14403682A JPH0321682B2 JP H0321682 B2 JPH0321682 B2 JP H0321682B2 JP 14403682 A JP14403682 A JP 14403682A JP 14403682 A JP14403682 A JP 14403682A JP H0321682 B2 JPH0321682 B2 JP H0321682B2
- Authority
- JP
- Japan
- Prior art keywords
- slag
- reduced
- oxidized
- roadbed material
- particle size
- 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
Links
- 239000002893 slag Substances 0.000 claims description 65
- 239000000463 material Substances 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 4
- 238000009628 steelmaking Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims 1
- 239000010426 asphalt Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Road Paving Structures (AREA)
Description
【発明の詳細な説明】
本発明は、電気炉スラグを利用した路盤材に関
し、その使用をも包含する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roadbed material using electric furnace slag, and includes the use thereof.
電気炉製鋼に伴うスラグには、酸化精錬期の終
りに排出される酸化期スラグ（ふつう「酸化スラ
グ」と略称される）と、還元精錬の完了により排
出される還元期スラグ（これも「還元スラグ」と
略称される）とがあり、重量にして、おおよそ
７：３の割合で発生する。 The slag associated with electric furnace steelmaking includes oxidation stage slag (usually abbreviated as "oxidation slag") discharged at the end of the oxidation refining stage, and reduction stage slag (also referred to as "reduction slag") discharged upon completion of reduction refining. (abbreviated as "slag"), which is generated in a ratio of approximately 7:3 by weight.
従来、酸化スラグは適宜の大きさに破砕して、
コンクリートの骨材やアスフアルト舗装の路盤材
として利用することが試みられ、一応の成功をみ
ていたが、還元スラグにはこれといつた利用の途
がなく、埋立てに使われる程度であつた。 Conventionally, oxidized slag is crushed into appropriate sizes and
Attempts were made to use it as aggregate for concrete and as a roadbed material for asphalt pavement, with some success, but there was no other use for reduced slag, and it was only used in landfills.
還元スラグが利用されない最大の理由は、発生
時に、その中に多量に含まれているケイ酸二カル
シウム2CaO・SiO2が高温から低温に冷却される
と、β相からγ相に変態し、変態に伴う体積膨脹
のため崩壊粉化する傾向があり、粉塵が立つて取
扱いにくいだけでなく、ある程度の粒径を要求さ
れる用途には向けられないということにある。 The biggest reason why reduced slag is not used is that when it is generated, when the dicalcium silicate 2CaO SiO 2 contained in large amounts is cooled from high temperature to low temperature, the β phase transforms into the γ phase. It tends to disintegrate and become powder due to the volume expansion associated with it, which not only creates dust and is difficult to handle, but also makes it unsuitable for applications that require a certain particle size.
本発明者らは、酸化スラグだけでなく還元スラ
グをも含めた電気炉スラグ全体の利用を意図して
研究し、両者を一定の割合で配合したものが、路
盤材として、たとえばアスフアルト舗装の下の路
盤に有用であることを見出し、その最適な使用法
を確立して本発明に至つた。 The present inventors conducted research with the intention of using the entire electric furnace slag, including not only oxidized slag but also reduced slag, and found that a mixture of both in a certain ratio could be used as a roadbed material, for example, under asphalt pavement. The present inventors have discovered that it is useful for roadbeds, and have established the optimum method for its use, leading to the present invention.
本発明の電気炉スラグを利用した路盤材は、電
気炉製鋼に伴い排出される酸化スラグおよび還元
スラグを路盤材として適当な大きさに破砕し、必
要により粒度調整を行なつて、酸化スラグ：還元
スラグ＝80〜60％：20〜40％（重量％）の割合で
配合してなるものである。 The roadbed material using the electric furnace slag of the present invention is produced by crushing the oxidized slag and reduced slag discharged from electric furnace steelmaking into appropriate sizes as the roadbed material, and adjusting the particle size as necessary to produce the oxidized slag: Reduced slag = 80 to 60%: 20 to 40% (weight %).
酸化スラグと還元スラグとを種々の割合で配合
したもの、および酸化スラグ単独の破砕物をつき
固め、一軸圧縮強度を測定した結果は、第１図に
示すとおりである。 Figure 1 shows the results of measuring the unconfined compressive strength of compacted mixtures of oxidized slag and reduced slag in various proportions and crushed oxidized slag alone.
第１図のグラフにみるとおり、酸化スラグに還
元スラグを配合したものは、従来試みられた酸化
スラグ単独の使用よりも好成積である。そして、
両者の配合比は、前記した、酸化スラグ：還元ス
ラグ＝80〜60％：20〜40％の範囲が有用であつ
て、とくに70：30近辺が最適である。前述のよう
に、酸化スラグと還元スラグとは、ほぼ７：３の
割合で発生するので、本発明に従つてこれを路盤
材として利用するには、発生したスラグをそのま
ま使えばよいことになり、すこぶる好都合であ
る。 As shown in the graph of FIG. 1, the mixture of oxidized slag and reduced slag has better growth than the previously attempted use of oxidized slag alone. and,
It is useful for the mixing ratio of the two to be in the range of oxidized slag:reduced slag=80 to 60%:20 to 40%, particularly around 70:30. As mentioned above, oxidized slag and reduced slag are generated in a ratio of approximately 7:3, so in order to use this as a roadbed material according to the present invention, it is sufficient to use the generated slag as it is. , which is very convenient.
酸化スラグと還元スラグとを複合使用して好成
績が得られる理由は明らかでないが、ひとつは前
者が適度に大きい粒度を有するところ、後者が比
較的細粉であつて、その間に入り込み、全体とし
て好ましい分布をすることがあげられ、いまひと
つは、還元スラグが酸化スラグより高い水硬性を
もつことにあると考えられる。天然砕石との強度
を比較するため、修正CBR試験を実施した。結
果は良好で、第２図に示すとおりである。酸化ス
ラグおよび還元スラグには若干の遊離石灰が含有
されることが避け難く、これを含んだまま路盤に
施工すると、後にCaO→Ca（OH）2の変化にもと
づく体積膨脹が起つて、アスフアルト舗装であれ
ばワレを生じるから、あらかじめ十分に消化して
おかなければならない。この対策としてエージン
グを試みたところ、第３図に示す結果を得た。ス
ラグの水浸膨脹率が、３カ月後にはほとんど問題
にならなくなることから、酸化スラグおよび還元
スラグは、水の作用の下に３カ月以上おくエージ
ングの後に使用することが好ましい。水は、スラ
グの破砕の直後に放水すれば足り、あとは雨水お
よび空気中の湿分の吸収により進行する。 The reason why good results can be obtained by using a combination of oxidized slag and reduced slag is not clear, but one reason is that the former has a moderately large particle size, and the latter is a relatively fine powder that can fit between them, which is preferable overall. Another reason is that reduced slag has higher hydraulic properties than oxidized slag. A modified CBR test was conducted to compare the strength with natural crushed stone. The results were good, as shown in FIG. It is unavoidable that oxidized slag and reduced slag contain some free lime, and if they are applied to the roadbed while containing this, volumetric expansion will occur due to the change of CaO → Ca (OH) 2 , and asphalt pavement will deteriorate. If so, it will cause cracking, so it must be digested thoroughly beforehand. As a countermeasure to this problem, aging was attempted and the results shown in FIG. 3 were obtained. Oxidized and reduced slags are preferably used after aging under the action of water for three months or more, since the water immersion expansion rate of the slag becomes less of a problem after three months. It is sufficient to spray water immediately after crushing the slag, and the rest progresses through the absorption of rainwater and moisture in the air.
次に、路盤への施工に際しては、前記した、還
元スラグがもつ若干の、そしてわずかではあるが
酸化スラグも有する水硬性を活用するため、本発
明の路盤材組成物に、適量の水を与えるべきであ
る。適切な初期含水率の値は、スラグの化学組成
のほか粒度分布などの条件によつても多少は異な
るが、代表的な例についての実験結果を示せば、
第３図のとおりである。つまり、酸化スラグ：還
元スラグ＝80〜60％：20〜40％の配合割合におい
ては、初期含水率を６〜10％の範囲にえらべば、
路盤材（HMS）として必要な一軸圧縮強度12
Kg／cm2を上回る値が得られる。なお、図から、
70：30の最適配合比の場合は、もつと広い範囲の
初期含水率を採用できること、そして最適の初期
含水率をえらぶことによつて、きわめて高い一軸
圧縮強度が得られることがわかる。 Next, when applying it to a roadbed, an appropriate amount of water is applied to the roadbed material composition of the present invention in order to take advantage of the above-mentioned hydraulic properties of reduced slag and oxidized slag. Should. The appropriate initial moisture content value varies somewhat depending on the chemical composition of the slag as well as conditions such as particle size distribution, but the experimental results for typical examples are as follows:
As shown in Figure 3. In other words, in the combination ratio of oxidized slag:reduced slag = 80-60%:20-40%, if the initial moisture content is selected in the range of 6-10%,
Unconfined compressive strength required for roadbed material (HMS)12
Values exceeding Kg/cm 2 are obtained. Furthermore, from the figure,
It can be seen that in the case of the optimal blending ratio of 70:30, a wide range of initial moisture contents can be adopted, and that by selecting the optimal initial moisture content, extremely high unconfined compressive strength can be obtained.
路盤材としての施工は、上記の注意を払えば、
そのほかは慣用の技術に従つて実施できる。 When installing it as a roadbed material, if the above precautions are taken,
The rest can be carried out according to conventional techniques.
本発明は酸化スラグおよび還元スラグからなる
電気炉スラグを発生比率のまま完全に利用するも
のであり、排出物の処理と資源の節約との一石二
鳥の効果がある。本発明の路盤材を得るに必要な
工程は、破砕と多少の粒度調整および混合だけで
あるから、特別の装置を必要とせず、消費エネル
ギーもわずかであつて、コストはきわめて低い。
これを使用した路盤は、通常のアスフアルト舗装
にとつては十分な強度があり、実用性は高い。 The present invention completely utilizes electric furnace slag consisting of oxidized slag and reduced slag in the same generation ratio, and has the effect of killing two birds with one stone by treating waste and saving resources. The only steps necessary to obtain the roadbed material of the present invention are crushing, some particle size adjustment, and mixing, so no special equipment is required, energy consumption is small, and the cost is extremely low.
The roadbed using this material has sufficient strength for ordinary asphalt pavement, and is highly practical.
実施例
酸化スラグと還元スラグとを、発生比率のま
ま、すなわち69％＋31％（重量）の割合で使用し
た。それぞれの化学組成はつぎのとおりである。EXAMPLE Oxidizing slag and reducing slag were used in their original proportions, ie 69%+31% (by weight). The chemical composition of each is as follows.
酸化スラグ 還元スラグ
CaO 41.8 49.4
SiO2 20.2 28.2
Al2O3 4.7 11.8
FeO 22.8 0.8
MgO 3.6 7.6
MnS 5.9 0.2
Ｓ 0.09 0.26
酸化スラグと、還元スラグのうち若干の塊状の
ものと破砕し、ふるい分けで、最大径25mmまでと
した。累積粒度分布は下記のとおりであつて、併
記したMS−25粒度規格をみたしている。粒 径
累積粒度分布(%) MS−25粒度規格
25mm 100 95−100
20 90.0
13 74.6 55−85
10 66.8
５ 52.3 30−65
2.5 39.3 20−50
1.2 30.6
0.6 21.1
0.4 19.0 10−30
0.3 17.0
0.15 10.9
0.074 6.4 2−10
上記の路盤材について、JIS A5015による一軸
圧縮強度試験を実施した。その結果はつぎのとお
りであつた。 Oxidized slag Reduced slag CaO 41.8 49.4 SiO 2 20.2 28.2 Al 2 O 3 4.7 11.8 FeO 22.8 0.8 MgO 3.6 7.6 MnS 5.9 0.2 S 0.09 0.26 Oxidized slag and some lumps of reduced slag are crushed and sieved to obtain maximum Maximum diameter is 25mm. The cumulative particle size distribution is as shown below and satisfies the MS-25 particle size standard. Particle size cumulative particle size distribution (%) MS-25 particle size standard 25mm 100 95-100 20 90.0 13 74.6 55-85 10 66.8 5 52.3 30-65 2.5 39.3 20-50 1.2 30.6 0.6 21.1 0.4 19.0 10-30 0.3 17.0 0.15 10.9 0.074 6.4 2−10 The above roadbed material was subjected to an unconfined compressive strength test according to JIS A5015. The results were as follows.
最適含水比 7.1％
一軸圧縮強度 15Kg／cm2
また、アスフアルト舗装要綱にもとづく修正
CBR試験を実施した。その結果はつぎのとおり
である。Optimum moisture content 7.1% Unconfined compressive strength 15Kg/cm 2 Also modified based on asphalt pavement guidelines
A CBR test was conducted. The results are as follows.
最適含水比 6.2％ 最大乾燥密度 2.840ｇ／cm3 修正CBR値 114.0％Optimal moisture content 6.2% Maximum dry density 2.840g/cm 3 Corrected CBR value 114.0%
第１図は、電気炉スラグを路盤材として使用し
たときの、スラグ組成と一軸圧縮強度との関係を
あらわすグラフである。第２図は、スラグ組成と
修CBR値の関係をあらわすグラフである。第３
図は、電気炉スラグの水浸膨脹率がエージングに
より低下する状況を示すグラフである。第４図
は、本発明の路盤材を使用する際の、初期含水比
が一軸圧縮強度に与える影響を示すグラフであ
る。
FIG. 1 is a graph showing the relationship between slag composition and unconfined compressive strength when electric furnace slag is used as a roadbed material. Figure 2 is a graph showing the relationship between slag composition and modified CBR value. Third
The figure is a graph showing a situation in which the water immersion expansion rate of electric furnace slag decreases due to aging. FIG. 4 is a graph showing the influence of initial moisture content on unconfined compressive strength when using the roadbed material of the present invention.
Claims (1)
び還元スラグを路盤材として適当な大きさに破砕
し、必要により粒度調整を行なつて、酸化スラ
グ：還元スラグ＝80〜60％：20〜40％（重量％）
の割合で配合してなる路盤材。 ２ 還元スラグを水の作用の下に３ケ月以上おく
エージングの後に使用する特許請求の範囲第１項
の路盤材。 ３ 電気炉製鋼に伴い排出される酸化スラグおよ
び還元スラグを路盤材として適当な大きさに破砕
し、必要により粒度調整を行なつて、酸化スラ
グ：還元スラグ＝80〜60％：20〜40％（重量％）
の割合で配合してなる路盤材を、初期含水比６〜
10％の状態で締め固めることからなる路盤工法。[Claims] 1. Oxidized slag and reduced slag discharged from electric furnace steelmaking are crushed into suitable sizes for use as roadbed material, and the particle size is adjusted as necessary to obtain oxidized slag: reduced slag = 80 to 60. %: 20-40% (wt%)
A roadbed material made of a mixture of 2. The roadbed material according to claim 1, which is used after aging the reduced slag by leaving it under the action of water for three months or more. 3 The oxidized slag and reduced slag discharged from electric furnace steelmaking are crushed into suitable sizes for use as roadbed material, and the particle size is adjusted as necessary to obtain oxidized slag: reduced slag = 80-60%: 20-40%. (weight%)
The initial water content of the roadbed material is from 6 to 6.
A roadbed construction method that consists of compacting at 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14403682A JPS5934302A (en) | 1982-08-20 | 1982-08-20 | Roadbed materials and roadbed construction methods |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14403682A JPS5934302A (en) | 1982-08-20 | 1982-08-20 | Roadbed materials and roadbed construction methods |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5934302A JPS5934302A (en) | 1984-02-24 |
| JPH0321682B2 true JPH0321682B2 (en) | 1991-03-25 |
Family
ID=15352822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14403682A Granted JPS5934302A (en) | 1982-08-20 | 1982-08-20 | Roadbed materials and roadbed construction methods |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5934302A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63279267A (en) * | 1987-05-11 | 1988-11-16 | Ueno Hiroshi | Multicolor printing method for thin metal |
| JPH01123671A (en) * | 1987-11-09 | 1989-05-16 | Maakutetsuku Kk | Dot marking method |
| JP6316626B2 (en) * | 2014-03-17 | 2018-04-25 | 日新製鋼株式会社 | Civil engineering materials and methods for producing the same |
| JP6766831B2 (en) * | 2018-02-10 | 2020-10-14 | Ｊｆｅスチール株式会社 | Manufacturing method of steelmaking slag roadbed material |
| JP6766832B2 (en) * | 2018-02-10 | 2020-10-14 | Ｊｆｅスチール株式会社 | Manufacturing method of steelmaking slag roadbed material |
-
1982
- 1982-08-20 JP JP14403682A patent/JPS5934302A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5934302A (en) | 1984-02-24 |
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